#ifndef WUFFS_INCLUDE_GUARD
#define WUFFS_INCLUDE_GUARD

// Wuffs ships as a "single file C library" or "header file library" as per
// https://github.com/nothings/stb/blob/master/docs/stb_howto.txt
//
// To use that single file as a "foo.c"-like implementation, instead of a
// "foo.h"-like header, #define WUFFS_IMPLEMENTATION before #include'ing or
// compiling it.

// Wuffs' C code is generated automatically, not hand-written. These warnings'
// costs outweigh the benefits.
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunreachable-code"
#pragma clang diagnostic ignored "-Wunused-function"
#endif

// Copyright 2017 The Wuffs Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

// Note that Clang also defines __GNUC__.
#ifdef __cplusplus
#if __cplusplus >= 201103L
#include <memory>
#elif defined(__GNUC__)
#warning "Wuffs' C++ code expects -std=c++11 or later"
#elif defined(_MSC_VER)
#pragma message("Wuffs' C++ code expects C++11 or later")
#endif

extern "C" {
#endif

// ---------------- Version

// WUFFS_VERSION is the major.minor.patch version, as per https://semver.org/,
// as a uint64_t. The major number is the high 32 bits. The minor number is the
// middle 16 bits. The patch number is the low 16 bits. The pre-release label
// and build metadata are part of the string representation (such as
// "1.2.3-beta+456.20181231") but not the uint64_t representation.
//
// WUFFS_VERSION_PRE_RELEASE_LABEL (such as "", "beta" or "rc.1") being
// non-empty denotes a developer preview, not a release version, and has no
// backwards or forwards compatibility guarantees.
//
// WUFFS_VERSION_BUILD_METADATA_XXX, if non-zero, are the number of commits and
// the last commit date in the repository used to build this library. Within
// each major.minor branch, the commit count should increase monotonically.
//
// !! Some code generation programs can override WUFFS_VERSION.
#define WUFFS_VERSION 0
#define WUFFS_VERSION_MAJOR 0
#define WUFFS_VERSION_MINOR 0
#define WUFFS_VERSION_PATCH 0
#define WUFFS_VERSION_PRE_RELEASE_LABEL "work.in.progress"
#define WUFFS_VERSION_BUILD_METADATA_COMMIT_COUNT 0
#define WUFFS_VERSION_BUILD_METADATA_COMMIT_DATE 0
#define WUFFS_VERSION_STRING "0.0.0+0.00000000"

// ---------------- Configuration

// Define WUFFS_CONFIG__AVOID_CPU_ARCH to avoid any code tied to a specific CPU
// architecture, such as SSE SIMD for the x86 CPU family.
#if defined(WUFFS_CONFIG__AVOID_CPU_ARCH)
// No-op.
#else
#if defined(__GNUC__)

// To simplify Wuffs code, "cpu_arch >= arm_xxx" requires xxx but also
// unaligned little-endian load/stores.
#if defined(__ARM_FEATURE_UNALIGNED) && defined(__BYTE_ORDER__) && \
    (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
// Not all gcc versions define __ARM_ACLE, even if they support crc32
// intrinsics. Look for __ARM_FEATURE_CRC32 instead.
#if defined(__ARM_FEATURE_CRC32)
#include <arm_acle.h>
#define WUFFS_BASE__CPU_ARCH__ARM_CRC32
#endif  // defined(__ARM_FEATURE_CRC32)
#if defined(__ARM_NEON)
#include <arm_neon.h>
#define WUFFS_BASE__CPU_ARCH__ARM_NEON
#endif  // defined(__ARM_NEON)
#endif  // defined(__ARM_FEATURE_UNALIGNED) etc

// Similarly, "cpu_arch >= x86_sse42" requires SSE4.2 but also PCLMUL and
// POPCNT. This is checked at runtime via cpuid, not at compile time.
#if defined(__x86_64__)
#include <cpuid.h>
#include <x86intrin.h>
#define WUFFS_BASE__CPU_ARCH__X86_64
#endif  // defined(__x86_64__)

#elif defined(_MSC_VER)  // defined(__GNUC__)

#if defined(_M_X64)
#include <intrin.h>
#define WUFFS_BASE__CPU_ARCH__X86_64
#endif  // defined(__x86_64__)

#endif  // defined(__GNUC__); defined(_MSC_VER)
#endif  // defined(WUFFS_CONFIG__AVOID_CPU_ARCH)

// --------

// Define WUFFS_CONFIG__STATIC_FUNCTIONS to make all of Wuffs' functions have
// static storage. The motivation is discussed in the "ALLOW STATIC
// IMPLEMENTATION" section of
// https://raw.githubusercontent.com/nothings/stb/master/docs/stb_howto.txt
#if defined(WUFFS_CONFIG__STATIC_FUNCTIONS)
#define WUFFS_BASE__MAYBE_STATIC static
#else
#define WUFFS_BASE__MAYBE_STATIC
#endif  // defined(WUFFS_CONFIG__STATIC_FUNCTIONS)

// ---------------- CPU Architecture

static inline bool  //
wuffs_base__cpu_arch__have_arm_crc32() {
#if defined(WUFFS_BASE__CPU_ARCH__ARM_CRC32)
  return true;
#else
  return false;
#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_CRC32)
}

static inline bool  //
wuffs_base__cpu_arch__have_arm_neon() {
#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
  return true;
#else
  return false;
#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
}

static inline bool  //
wuffs_base__cpu_arch__have_x86_sse42() {
#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
  // GCC defines these macros but MSVC does not.
  //  - bit_PCLMUL = (1 <<  1)
  //  - bit_POPCNT = (1 << 23)
  //  - bit_SSE4_2 = (1 << 20)
  const unsigned int sse42_ecx1 = 0x00900002;
#if defined(__GNUC__)
  unsigned int eax1 = 0;
  unsigned int ebx1 = 0;
  unsigned int ecx1 = 0;
  unsigned int edx1 = 0;
  if (__get_cpuid(1, &eax1, &ebx1, &ecx1, &edx1)) {
    return (ecx1 & sse42_ecx1) == sse42_ecx1;
  }
#elif defined(_MSC_VER)  // defined(__GNUC__)
  int x[4];
  __cpuid(x, 1);
  return (((unsigned int)(x[2])) & sse42_ecx1) == sse42_ecx1;
#else
#error "WUFFS_BASE__CPU_ARCH__ETC combined with an unsupported compiler"
#endif  // defined(__GNUC__); defined(_MSC_VER)
#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_64)
  return false;
}

// ---------------- Fundamentals

// Wuffs assumes that:
//  - converting a uint32_t to a size_t will never overflow.
//  - converting a size_t to a uint64_t will never overflow.
#ifdef __WORDSIZE
#if (__WORDSIZE != 32) && (__WORDSIZE != 64)
#error "Wuffs requires a word size of either 32 or 64 bits"
#endif
#endif

#if defined(__clang__)
#define WUFFS_BASE__POTENTIALLY_UNUSED_FIELD __attribute__((unused))
#else
#define WUFFS_BASE__POTENTIALLY_UNUSED_FIELD
#endif

// Clang also defines "__GNUC__".
#if defined(__GNUC__)
#define WUFFS_BASE__POTENTIALLY_UNUSED __attribute__((unused))
#define WUFFS_BASE__WARN_UNUSED_RESULT __attribute__((warn_unused_result))
#else
#define WUFFS_BASE__POTENTIALLY_UNUSED
#define WUFFS_BASE__WARN_UNUSED_RESULT
#endif

// --------

// Options (bitwise or'ed together) for wuffs_foo__bar__initialize functions.

#define WUFFS_INITIALIZE__DEFAULT_OPTIONS ((uint32_t)0x00000000)

// WUFFS_INITIALIZE__ALREADY_ZEROED means that the "self" receiver struct value
// has already been set to all zeroes.
#define WUFFS_INITIALIZE__ALREADY_ZEROED ((uint32_t)0x00000001)

// WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED means that, absent
// WUFFS_INITIALIZE__ALREADY_ZEROED, only some of the "self" receiver struct
// value will be set to all zeroes. Internal buffers, which tend to be a large
// proportion of the struct's size, will be left uninitialized. Internal means
// that the buffer is contained by the receiver struct, as opposed to being
// passed as a separately allocated "work buffer".
//
// For more detail, see:
// https://github.com/google/wuffs/blob/main/doc/note/initialization.md
#define WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED \
  ((uint32_t)0x00000002)

// --------

// wuffs_base__empty_struct is used when a Wuffs function returns an empty
// struct. In C, if a function f returns void, you can't say "x = f()", but in
// Wuffs, if a function g returns empty, you can say "y = g()".
typedef struct wuffs_base__empty_struct__struct {
  // private_impl is a placeholder field. It isn't explicitly used, except that
  // without it, the sizeof a struct with no fields can differ across C/C++
  // compilers, and it is undefined behavior in C99. For example, gcc says that
  // the sizeof an empty struct is 0, and g++ says that it is 1. This leads to
  // ABI incompatibility if a Wuffs .c file is processed by one compiler and
  // its .h file with another compiler.
  //
  // Instead, we explicitly insert an otherwise unused field, so that the
  // sizeof this struct is always 1.
  uint8_t private_impl;
} wuffs_base__empty_struct;

static inline wuffs_base__empty_struct  //
wuffs_base__make_empty_struct() {
  wuffs_base__empty_struct ret;
  ret.private_impl = 0;
  return ret;
}

// wuffs_base__utility is a placeholder receiver type. It enables what Java
// calls static methods, as opposed to regular methods.
typedef struct wuffs_base__utility__struct {
  // private_impl is a placeholder field. It isn't explicitly used, except that
  // without it, the sizeof a struct with no fields can differ across C/C++
  // compilers, and it is undefined behavior in C99. For example, gcc says that
  // the sizeof an empty struct is 0, and g++ says that it is 1. This leads to
  // ABI incompatibility if a Wuffs .c file is processed by one compiler and
  // its .h file with another compiler.
  //
  // Instead, we explicitly insert an otherwise unused field, so that the
  // sizeof this struct is always 1.
  uint8_t private_impl;
} wuffs_base__utility;

typedef struct wuffs_base__vtable__struct {
  const char* vtable_name;
  const void* function_pointers;
} wuffs_base__vtable;

// --------

// See https://github.com/google/wuffs/blob/main/doc/note/statuses.md
typedef struct wuffs_base__status__struct {
  const char* repr;

#ifdef __cplusplus
  inline bool is_complete() const;
  inline bool is_error() const;
  inline bool is_note() const;
  inline bool is_ok() const;
  inline bool is_suspension() const;
  inline const char* message() const;
#endif  // __cplusplus

} wuffs_base__status;

extern const char wuffs_base__note__i_o_redirect[];
extern const char wuffs_base__note__end_of_data[];
extern const char wuffs_base__note__metadata_reported[];
extern const char wuffs_base__suspension__even_more_information[];
extern const char wuffs_base__suspension__mispositioned_read[];
extern const char wuffs_base__suspension__mispositioned_write[];
extern const char wuffs_base__suspension__short_read[];
extern const char wuffs_base__suspension__short_write[];
extern const char wuffs_base__error__bad_i_o_position[];
extern const char wuffs_base__error__bad_argument_length_too_short[];
extern const char wuffs_base__error__bad_argument[];
extern const char wuffs_base__error__bad_call_sequence[];
extern const char wuffs_base__error__bad_data[];
extern const char wuffs_base__error__bad_receiver[];
extern const char wuffs_base__error__bad_restart[];
extern const char wuffs_base__error__bad_sizeof_receiver[];
extern const char wuffs_base__error__bad_vtable[];
extern const char wuffs_base__error__bad_workbuf_length[];
extern const char wuffs_base__error__bad_wuffs_version[];
extern const char wuffs_base__error__cannot_return_a_suspension[];
extern const char wuffs_base__error__disabled_by_previous_error[];
extern const char wuffs_base__error__initialize_falsely_claimed_already_zeroed[];
extern const char wuffs_base__error__initialize_not_called[];
extern const char wuffs_base__error__interleaved_coroutine_calls[];
extern const char wuffs_base__error__no_more_information[];
extern const char wuffs_base__error__not_enough_data[];
extern const char wuffs_base__error__out_of_bounds[];
extern const char wuffs_base__error__unsupported_method[];
extern const char wuffs_base__error__unsupported_option[];
extern const char wuffs_base__error__unsupported_pixel_swizzler_option[];
extern const char wuffs_base__error__too_much_data[];

static inline wuffs_base__status  //
wuffs_base__make_status(const char* repr) {
  wuffs_base__status z;
  z.repr = repr;
  return z;
}

static inline bool  //
wuffs_base__status__is_complete(const wuffs_base__status* z) {
  return (z->repr == NULL) || ((*z->repr != '$') && (*z->repr != '#'));
}

static inline bool  //
wuffs_base__status__is_error(const wuffs_base__status* z) {
  return z->repr && (*z->repr == '#');
}

static inline bool  //
wuffs_base__status__is_note(const wuffs_base__status* z) {
  return z->repr && (*z->repr != '$') && (*z->repr != '#');
}

static inline bool  //
wuffs_base__status__is_ok(const wuffs_base__status* z) {
  return z->repr == NULL;
}

static inline bool  //
wuffs_base__status__is_suspension(const wuffs_base__status* z) {
  return z->repr && (*z->repr == '$');
}

// wuffs_base__status__message strips the leading '$', '#' or '@'.
static inline const char*  //
wuffs_base__status__message(const wuffs_base__status* z) {
  if (z->repr) {
    if ((*z->repr == '$') || (*z->repr == '#') || (*z->repr == '@')) {
      return z->repr + 1;
    }
  }
  return z->repr;
}

#ifdef __cplusplus

inline bool  //
wuffs_base__status::is_complete() const {
  return wuffs_base__status__is_complete(this);
}

inline bool  //
wuffs_base__status::is_error() const {
  return wuffs_base__status__is_error(this);
}

inline bool  //
wuffs_base__status::is_note() const {
  return wuffs_base__status__is_note(this);
}

inline bool  //
wuffs_base__status::is_ok() const {
  return wuffs_base__status__is_ok(this);
}

inline bool  //
wuffs_base__status::is_suspension() const {
  return wuffs_base__status__is_suspension(this);
}

inline const char*  //
wuffs_base__status::message() const {
  return wuffs_base__status__message(this);
}

#endif  // __cplusplus

// --------

// WUFFS_BASE__RESULT is a result type: either a status (an error) or a value.
//
// A result with all fields NULL or zero is as valid as a zero-valued T.
#define WUFFS_BASE__RESULT(T)  \
  struct {                     \
    wuffs_base__status status; \
    T value;                   \
  }

typedef WUFFS_BASE__RESULT(double) wuffs_base__result_f64;
typedef WUFFS_BASE__RESULT(int64_t) wuffs_base__result_i64;
typedef WUFFS_BASE__RESULT(uint64_t) wuffs_base__result_u64;

// --------

// wuffs_base__transform__output is the result of transforming from a src slice
// to a dst slice.
typedef struct wuffs_base__transform__output__struct {
  wuffs_base__status status;
  size_t num_dst;
  size_t num_src;
} wuffs_base__transform__output;

// --------

// FourCC constants.

// Bitmap.
#define WUFFS_BASE__FOURCC__BMP 0x424D5020

// Brotli.
#define WUFFS_BASE__FOURCC__BRTL 0x4252544C

// Bzip2.
#define WUFFS_BASE__FOURCC__BZ2 0x425A3220

// Concise Binary Object Representation.
#define WUFFS_BASE__FOURCC__CBOR 0x43424F52

// Cascading Style Sheets.
#define WUFFS_BASE__FOURCC__CSS 0x43535320

// Encapsulated PostScript.
#define WUFFS_BASE__FOURCC__EPS 0x45505320

// Free Lossless Audio Codec.
#define WUFFS_BASE__FOURCC__FLAC 0x464C4143

// Graphics Interchange Format.
#define WUFFS_BASE__FOURCC__GIF 0x47494620

// GNU Zip.
#define WUFFS_BASE__FOURCC__GZ 0x475A2020

// High Efficiency Image File.
#define WUFFS_BASE__FOURCC__HEIF 0x48454946

// Hypertext Markup Language.
#define WUFFS_BASE__FOURCC__HTML 0x48544D4C

// International Color Consortium Profile.
#define WUFFS_BASE__FOURCC__ICCP 0x49434350

// Icon.
#define WUFFS_BASE__FOURCC__ICO 0x49434F20

// Icon Vector Graphics.
#define WUFFS_BASE__FOURCC__ICVG 0x49435647

// Initialization.
#define WUFFS_BASE__FOURCC__INI 0x494E4920

// Joint Photographic Experts Group.
#define WUFFS_BASE__FOURCC__JPEG 0x4A504547

// JavaScript.
#define WUFFS_BASE__FOURCC__JS 0x4A532020

// JavaScript Object Notation.
#define WUFFS_BASE__FOURCC__JSON 0x4A534F4E

// JSON With Commas and Comments.
#define WUFFS_BASE__FOURCC__JWCC 0x4A574343

// Lempel–Ziv 4.
#define WUFFS_BASE__FOURCC__LZ4 0x4C5A3420

// Markdown.
#define WUFFS_BASE__FOURCC__MD 0x4D442020

// MPEG-1 Audio Layer III.
#define WUFFS_BASE__FOURCC__MP3 0x4D503320

// Naive Image.
#define WUFFS_BASE__FOURCC__NIE 0x4E494520

// Open Type Format.
#define WUFFS_BASE__FOURCC__OTF 0x4F544620

// Portable Document Format.
#define WUFFS_BASE__FOURCC__PDF 0x50444620

// Portable Network Graphics.
#define WUFFS_BASE__FOURCC__PNG 0x504E4720

// Portable Anymap.
#define WUFFS_BASE__FOURCC__PNM 0x504E4D20

// PostScript.
#define WUFFS_BASE__FOURCC__PS 0x50532020

// Random Access Compression.
#define WUFFS_BASE__FOURCC__RAC 0x52414320

// Raw.
#define WUFFS_BASE__FOURCC__RAW 0x52415720

// Resource Interchange File Format.
#define WUFFS_BASE__FOURCC__RIFF 0x52494646

// Riegeli Records.
#define WUFFS_BASE__FOURCC__RIGL 0x5249474C

// Snappy.
#define WUFFS_BASE__FOURCC__SNPY 0x534E5059

// Scalable Vector Graphics.
#define WUFFS_BASE__FOURCC__SVG 0x53564720

// Tape Archive.
#define WUFFS_BASE__FOURCC__TAR 0x54415220

// Tagged Image File Format.
#define WUFFS_BASE__FOURCC__TIFF 0x54494646

// Tom's Obvious Minimal Language.
#define WUFFS_BASE__FOURCC__TOML 0x544F4D4C

// Waveform.
#define WUFFS_BASE__FOURCC__WAVE 0x57415645

// Wireless Bitmap.
#define WUFFS_BASE__FOURCC__WBMP 0x57424D50

// Web Open Font Format.
#define WUFFS_BASE__FOURCC__WOFF 0x574F4646

// Web Picture (VP8).
#define WUFFS_BASE__FOURCC__WP8 0x57503820

// Web Picture (VP8 Lossless).
#define WUFFS_BASE__FOURCC__WP8L 0x5750384C

// Extensible Markup Language.
#define WUFFS_BASE__FOURCC__XML 0x584D4C20

// Extensible Metadata Platform.
#define WUFFS_BASE__FOURCC__XMP 0x584D5020

// Xz.
#define WUFFS_BASE__FOURCC__XZ 0x585A2020

// Zip.
#define WUFFS_BASE__FOURCC__ZIP 0x5A495020

// Zlib.
#define WUFFS_BASE__FOURCC__ZLIB 0x5A4C4942

// Zstandard.
#define WUFFS_BASE__FOURCC__ZSTD 0x5A535444

// --------

// Quirks.

#define WUFFS_BASE__QUIRK_IGNORE_CHECKSUM 1

// --------

// Flicks are a unit of time. One flick (frame-tick) is 1 / 705_600_000 of a
// second. See https://github.com/OculusVR/Flicks
typedef int64_t wuffs_base__flicks;

#define WUFFS_BASE__FLICKS_PER_SECOND ((uint64_t)705600000)
#define WUFFS_BASE__FLICKS_PER_MILLISECOND ((uint64_t)705600)

// ---------------- Numeric Types

// The helpers below are functions, instead of macros, because their arguments
// can be an expression that we shouldn't evaluate more than once.
//
// They are static, so that linking multiple wuffs .o files won't complain about
// duplicate function definitions.
//
// They are explicitly marked inline, even if modern compilers don't use the
// inline attribute to guide optimizations such as inlining, to avoid the
// -Wunused-function warning, and we like to compile with -Wall -Werror.

static inline int8_t  //
wuffs_base__i8__min(int8_t x, int8_t y) {
  return x < y ? x : y;
}

static inline int8_t  //
wuffs_base__i8__max(int8_t x, int8_t y) {
  return x > y ? x : y;
}

static inline int16_t  //
wuffs_base__i16__min(int16_t x, int16_t y) {
  return x < y ? x : y;
}

static inline int16_t  //
wuffs_base__i16__max(int16_t x, int16_t y) {
  return x > y ? x : y;
}

static inline int32_t  //
wuffs_base__i32__min(int32_t x, int32_t y) {
  return x < y ? x : y;
}

static inline int32_t  //
wuffs_base__i32__max(int32_t x, int32_t y) {
  return x > y ? x : y;
}

static inline int64_t  //
wuffs_base__i64__min(int64_t x, int64_t y) {
  return x < y ? x : y;
}

static inline int64_t  //
wuffs_base__i64__max(int64_t x, int64_t y) {
  return x > y ? x : y;
}

static inline uint8_t  //
wuffs_base__u8__min(uint8_t x, uint8_t y) {
  return x < y ? x : y;
}

static inline uint8_t  //
wuffs_base__u8__max(uint8_t x, uint8_t y) {
  return x > y ? x : y;
}

static inline uint16_t  //
wuffs_base__u16__min(uint16_t x, uint16_t y) {
  return x < y ? x : y;
}

static inline uint16_t  //
wuffs_base__u16__max(uint16_t x, uint16_t y) {
  return x > y ? x : y;
}

static inline uint32_t  //
wuffs_base__u32__min(uint32_t x, uint32_t y) {
  return x < y ? x : y;
}

static inline uint32_t  //
wuffs_base__u32__max(uint32_t x, uint32_t y) {
  return x > y ? x : y;
}

static inline uint64_t  //
wuffs_base__u64__min(uint64_t x, uint64_t y) {
  return x < y ? x : y;
}

static inline uint64_t  //
wuffs_base__u64__max(uint64_t x, uint64_t y) {
  return x > y ? x : y;
}

// --------

// Saturating arithmetic (sat_add, sat_sub) branchless bit-twiddling algorithms
// are per https://locklessinc.com/articles/sat_arithmetic/
//
// It is important that the underlying types are unsigned integers, as signed
// integer arithmetic overflow is undefined behavior in C.

static inline uint8_t  //
wuffs_base__u8__sat_add(uint8_t x, uint8_t y) {
  uint8_t res = (uint8_t)(x + y);
  res |= (uint8_t)(-(res < x));
  return res;
}

static inline uint8_t  //
wuffs_base__u8__sat_sub(uint8_t x, uint8_t y) {
  uint8_t res = (uint8_t)(x - y);
  res &= (uint8_t)(-(res <= x));
  return res;
}

static inline uint16_t  //
wuffs_base__u16__sat_add(uint16_t x, uint16_t y) {
  uint16_t res = (uint16_t)(x + y);
  res |= (uint16_t)(-(res < x));
  return res;
}

static inline uint16_t  //
wuffs_base__u16__sat_sub(uint16_t x, uint16_t y) {
  uint16_t res = (uint16_t)(x - y);
  res &= (uint16_t)(-(res <= x));
  return res;
}

static inline uint32_t  //
wuffs_base__u32__sat_add(uint32_t x, uint32_t y) {
  uint32_t res = (uint32_t)(x + y);
  res |= (uint32_t)(-(res < x));
  return res;
}

static inline uint32_t  //
wuffs_base__u32__sat_sub(uint32_t x, uint32_t y) {
  uint32_t res = (uint32_t)(x - y);
  res &= (uint32_t)(-(res <= x));
  return res;
}

static inline uint64_t  //
wuffs_base__u64__sat_add(uint64_t x, uint64_t y) {
  uint64_t res = (uint64_t)(x + y);
  res |= (uint64_t)(-(res < x));
  return res;
}

static inline uint64_t  //
wuffs_base__u64__sat_sub(uint64_t x, uint64_t y) {
  uint64_t res = (uint64_t)(x - y);
  res &= (uint64_t)(-(res <= x));
  return res;
}

// --------

typedef struct wuffs_base__multiply_u64__output__struct {
  uint64_t lo;
  uint64_t hi;
} wuffs_base__multiply_u64__output;

// wuffs_base__multiply_u64 returns x*y as a 128-bit value.
//
// The maximum inclusive output hi_lo is 0xFFFFFFFFFFFFFFFE_0000000000000001.
static inline wuffs_base__multiply_u64__output  //
wuffs_base__multiply_u64(uint64_t x, uint64_t y) {
#if defined(__SIZEOF_INT128__)
  __uint128_t z = ((__uint128_t)x) * ((__uint128_t)y);
  wuffs_base__multiply_u64__output o;
  o.lo = ((uint64_t)(z));
  o.hi = ((uint64_t)(z >> 64));
  return o;
#else
  uint64_t x0 = x & 0xFFFFFFFF;
  uint64_t x1 = x >> 32;
  uint64_t y0 = y & 0xFFFFFFFF;
  uint64_t y1 = y >> 32;
  uint64_t w0 = x0 * y0;
  uint64_t t = (x1 * y0) + (w0 >> 32);
  uint64_t w1 = t & 0xFFFFFFFF;
  uint64_t w2 = t >> 32;
  w1 += x0 * y1;
  wuffs_base__multiply_u64__output o;
  o.lo = x * y;
  o.hi = (x1 * y1) + w2 + (w1 >> 32);
  return o;
#endif
}

// --------

#if defined(__GNUC__) && (__SIZEOF_LONG__ == 8)

static inline uint32_t  //
wuffs_base__count_leading_zeroes_u64(uint64_t u) {
  return u ? ((uint32_t)(__builtin_clzl(u))) : 64u;
}

#else

static inline uint32_t  //
wuffs_base__count_leading_zeroes_u64(uint64_t u) {
  if (u == 0) {
    return 64;
  }

  uint32_t n = 0;
  if ((u >> 32) == 0) {
    n |= 32;
    u <<= 32;
  }
  if ((u >> 48) == 0) {
    n |= 16;
    u <<= 16;
  }
  if ((u >> 56) == 0) {
    n |= 8;
    u <<= 8;
  }
  if ((u >> 60) == 0) {
    n |= 4;
    u <<= 4;
  }
  if ((u >> 62) == 0) {
    n |= 2;
    u <<= 2;
  }
  if ((u >> 63) == 0) {
    n |= 1;
    u <<= 1;
  }
  return n;
}

#endif  // defined(__GNUC__) && (__SIZEOF_LONG__ == 8)

// --------

#define wuffs_base__peek_u8be__no_bounds_check \
  wuffs_base__peek_u8__no_bounds_check
#define wuffs_base__peek_u8le__no_bounds_check \
  wuffs_base__peek_u8__no_bounds_check

static inline uint8_t  //
wuffs_base__peek_u8__no_bounds_check(const uint8_t* p) {
  return p[0];
}

static inline uint16_t  //
wuffs_base__peek_u16be__no_bounds_check(const uint8_t* p) {
  return (uint16_t)(((uint16_t)(p[0]) << 8) | ((uint16_t)(p[1]) << 0));
}

static inline uint16_t  //
wuffs_base__peek_u16le__no_bounds_check(const uint8_t* p) {
  return (uint16_t)(((uint16_t)(p[0]) << 0) | ((uint16_t)(p[1]) << 8));
}

static inline uint32_t  //
wuffs_base__peek_u24be__no_bounds_check(const uint8_t* p) {
  return ((uint32_t)(p[0]) << 16) | ((uint32_t)(p[1]) << 8) |
         ((uint32_t)(p[2]) << 0);
}

static inline uint32_t  //
wuffs_base__peek_u24le__no_bounds_check(const uint8_t* p) {
  return ((uint32_t)(p[0]) << 0) | ((uint32_t)(p[1]) << 8) |
         ((uint32_t)(p[2]) << 16);
}

static inline uint32_t  //
wuffs_base__peek_u32be__no_bounds_check(const uint8_t* p) {
  return ((uint32_t)(p[0]) << 24) | ((uint32_t)(p[1]) << 16) |
         ((uint32_t)(p[2]) << 8) | ((uint32_t)(p[3]) << 0);
}

static inline uint32_t  //
wuffs_base__peek_u32le__no_bounds_check(const uint8_t* p) {
  return ((uint32_t)(p[0]) << 0) | ((uint32_t)(p[1]) << 8) |
         ((uint32_t)(p[2]) << 16) | ((uint32_t)(p[3]) << 24);
}

static inline uint64_t  //
wuffs_base__peek_u40be__no_bounds_check(const uint8_t* p) {
  return ((uint64_t)(p[0]) << 32) | ((uint64_t)(p[1]) << 24) |
         ((uint64_t)(p[2]) << 16) | ((uint64_t)(p[3]) << 8) |
         ((uint64_t)(p[4]) << 0);
}

static inline uint64_t  //
wuffs_base__peek_u40le__no_bounds_check(const uint8_t* p) {
  return ((uint64_t)(p[0]) << 0) | ((uint64_t)(p[1]) << 8) |
         ((uint64_t)(p[2]) << 16) | ((uint64_t)(p[3]) << 24) |
         ((uint64_t)(p[4]) << 32);
}

static inline uint64_t  //
wuffs_base__peek_u48be__no_bounds_check(const uint8_t* p) {
  return ((uint64_t)(p[0]) << 40) | ((uint64_t)(p[1]) << 32) |
         ((uint64_t)(p[2]) << 24) | ((uint64_t)(p[3]) << 16) |
         ((uint64_t)(p[4]) << 8) | ((uint64_t)(p[5]) << 0);
}

static inline uint64_t  //
wuffs_base__peek_u48le__no_bounds_check(const uint8_t* p) {
  return ((uint64_t)(p[0]) << 0) | ((uint64_t)(p[1]) << 8) |
         ((uint64_t)(p[2]) << 16) | ((uint64_t)(p[3]) << 24) |
         ((uint64_t)(p[4]) << 32) | ((uint64_t)(p[5]) << 40);
}

static inline uint64_t  //
wuffs_base__peek_u56be__no_bounds_check(const uint8_t* p) {
  return ((uint64_t)(p[0]) << 48) | ((uint64_t)(p[1]) << 40) |
         ((uint64_t)(p[2]) << 32) | ((uint64_t)(p[3]) << 24) |
         ((uint64_t)(p[4]) << 16) | ((uint64_t)(p[5]) << 8) |
         ((uint64_t)(p[6]) << 0);
}

static inline uint64_t  //
wuffs_base__peek_u56le__no_bounds_check(const uint8_t* p) {
  return ((uint64_t)(p[0]) << 0) | ((uint64_t)(p[1]) << 8) |
         ((uint64_t)(p[2]) << 16) | ((uint64_t)(p[3]) << 24) |
         ((uint64_t)(p[4]) << 32) | ((uint64_t)(p[5]) << 40) |
         ((uint64_t)(p[6]) << 48);
}

static inline uint64_t  //
wuffs_base__peek_u64be__no_bounds_check(const uint8_t* p) {
  return ((uint64_t)(p[0]) << 56) | ((uint64_t)(p[1]) << 48) |
         ((uint64_t)(p[2]) << 40) | ((uint64_t)(p[3]) << 32) |
         ((uint64_t)(p[4]) << 24) | ((uint64_t)(p[5]) << 16) |
         ((uint64_t)(p[6]) << 8) | ((uint64_t)(p[7]) << 0);
}

static inline uint64_t  //
wuffs_base__peek_u64le__no_bounds_check(const uint8_t* p) {
  return ((uint64_t)(p[0]) << 0) | ((uint64_t)(p[1]) << 8) |
         ((uint64_t)(p[2]) << 16) | ((uint64_t)(p[3]) << 24) |
         ((uint64_t)(p[4]) << 32) | ((uint64_t)(p[5]) << 40) |
         ((uint64_t)(p[6]) << 48) | ((uint64_t)(p[7]) << 56);
}

// --------

#define wuffs_base__poke_u8be__no_bounds_check \
  wuffs_base__poke_u8__no_bounds_check
#define wuffs_base__poke_u8le__no_bounds_check \
  wuffs_base__poke_u8__no_bounds_check

static inline void  //
wuffs_base__poke_u8__no_bounds_check(uint8_t* p, uint8_t x) {
  p[0] = x;
}

static inline void  //
wuffs_base__poke_u16be__no_bounds_check(uint8_t* p, uint16_t x) {
  p[0] = (uint8_t)(x >> 8);
  p[1] = (uint8_t)(x >> 0);
}

static inline void  //
wuffs_base__poke_u16le__no_bounds_check(uint8_t* p, uint16_t x) {
#if defined(__GNUC__) && !defined(__clang__) && defined(__x86_64__)
  // This seems to perform better on gcc 10 (but not clang 9). Clang also
  // defines "__GNUC__".
  memcpy(p, &x, 2);
#else
  p[0] = (uint8_t)(x >> 0);
  p[1] = (uint8_t)(x >> 8);
#endif
}

static inline void  //
wuffs_base__poke_u24be__no_bounds_check(uint8_t* p, uint32_t x) {
  p[0] = (uint8_t)(x >> 16);
  p[1] = (uint8_t)(x >> 8);
  p[2] = (uint8_t)(x >> 0);
}

static inline void  //
wuffs_base__poke_u24le__no_bounds_check(uint8_t* p, uint32_t x) {
  p[0] = (uint8_t)(x >> 0);
  p[1] = (uint8_t)(x >> 8);
  p[2] = (uint8_t)(x >> 16);
}

static inline void  //
wuffs_base__poke_u32be__no_bounds_check(uint8_t* p, uint32_t x) {
  p[0] = (uint8_t)(x >> 24);
  p[1] = (uint8_t)(x >> 16);
  p[2] = (uint8_t)(x >> 8);
  p[3] = (uint8_t)(x >> 0);
}

static inline void  //
wuffs_base__poke_u32le__no_bounds_check(uint8_t* p, uint32_t x) {
#if defined(__GNUC__) && !defined(__clang__) && defined(__x86_64__)
  // This seems to perform better on gcc 10 (but not clang 9). Clang also
  // defines "__GNUC__".
  memcpy(p, &x, 4);
#else
  p[0] = (uint8_t)(x >> 0);
  p[1] = (uint8_t)(x >> 8);
  p[2] = (uint8_t)(x >> 16);
  p[3] = (uint8_t)(x >> 24);
#endif
}

static inline void  //
wuffs_base__poke_u40be__no_bounds_check(uint8_t* p, uint64_t x) {
  p[0] = (uint8_t)(x >> 32);
  p[1] = (uint8_t)(x >> 24);
  p[2] = (uint8_t)(x >> 16);
  p[3] = (uint8_t)(x >> 8);
  p[4] = (uint8_t)(x >> 0);
}

static inline void  //
wuffs_base__poke_u40le__no_bounds_check(uint8_t* p, uint64_t x) {
  p[0] = (uint8_t)(x >> 0);
  p[1] = (uint8_t)(x >> 8);
  p[2] = (uint8_t)(x >> 16);
  p[3] = (uint8_t)(x >> 24);
  p[4] = (uint8_t)(x >> 32);
}

static inline void  //
wuffs_base__poke_u48be__no_bounds_check(uint8_t* p, uint64_t x) {
  p[0] = (uint8_t)(x >> 40);
  p[1] = (uint8_t)(x >> 32);
  p[2] = (uint8_t)(x >> 24);
  p[3] = (uint8_t)(x >> 16);
  p[4] = (uint8_t)(x >> 8);
  p[5] = (uint8_t)(x >> 0);
}

static inline void  //
wuffs_base__poke_u48le__no_bounds_check(uint8_t* p, uint64_t x) {
  p[0] = (uint8_t)(x >> 0);
  p[1] = (uint8_t)(x >> 8);
  p[2] = (uint8_t)(x >> 16);
  p[3] = (uint8_t)(x >> 24);
  p[4] = (uint8_t)(x >> 32);
  p[5] = (uint8_t)(x >> 40);
}

static inline void  //
wuffs_base__poke_u56be__no_bounds_check(uint8_t* p, uint64_t x) {
  p[0] = (uint8_t)(x >> 48);
  p[1] = (uint8_t)(x >> 40);
  p[2] = (uint8_t)(x >> 32);
  p[3] = (uint8_t)(x >> 24);
  p[4] = (uint8_t)(x >> 16);
  p[5] = (uint8_t)(x >> 8);
  p[6] = (uint8_t)(x >> 0);
}

static inline void  //
wuffs_base__poke_u56le__no_bounds_check(uint8_t* p, uint64_t x) {
  p[0] = (uint8_t)(x >> 0);
  p[1] = (uint8_t)(x >> 8);
  p[2] = (uint8_t)(x >> 16);
  p[3] = (uint8_t)(x >> 24);
  p[4] = (uint8_t)(x >> 32);
  p[5] = (uint8_t)(x >> 40);
  p[6] = (uint8_t)(x >> 48);
}

static inline void  //
wuffs_base__poke_u64be__no_bounds_check(uint8_t* p, uint64_t x) {
  p[0] = (uint8_t)(x >> 56);
  p[1] = (uint8_t)(x >> 48);
  p[2] = (uint8_t)(x >> 40);
  p[3] = (uint8_t)(x >> 32);
  p[4] = (uint8_t)(x >> 24);
  p[5] = (uint8_t)(x >> 16);
  p[6] = (uint8_t)(x >> 8);
  p[7] = (uint8_t)(x >> 0);
}

static inline void  //
wuffs_base__poke_u64le__no_bounds_check(uint8_t* p, uint64_t x) {
#if defined(__GNUC__) && !defined(__clang__) && defined(__x86_64__)
  // This seems to perform better on gcc 10 (but not clang 9). Clang also
  // defines "__GNUC__".
  memcpy(p, &x, 8);
#else
  p[0] = (uint8_t)(x >> 0);
  p[1] = (uint8_t)(x >> 8);
  p[2] = (uint8_t)(x >> 16);
  p[3] = (uint8_t)(x >> 24);
  p[4] = (uint8_t)(x >> 32);
  p[5] = (uint8_t)(x >> 40);
  p[6] = (uint8_t)(x >> 48);
  p[7] = (uint8_t)(x >> 56);
#endif
}

// --------

// Load and Store functions are deprecated. Use Peek and Poke instead.

#define wuffs_base__load_u8__no_bounds_check \
  wuffs_base__peek_u8__no_bounds_check
#define wuffs_base__load_u16be__no_bounds_check \
  wuffs_base__peek_u16be__no_bounds_check
#define wuffs_base__load_u16le__no_bounds_check \
  wuffs_base__peek_u16le__no_bounds_check
#define wuffs_base__load_u24be__no_bounds_check \
  wuffs_base__peek_u24be__no_bounds_check
#define wuffs_base__load_u24le__no_bounds_check \
  wuffs_base__peek_u24le__no_bounds_check
#define wuffs_base__load_u32be__no_bounds_check \
  wuffs_base__peek_u32be__no_bounds_check
#define wuffs_base__load_u32le__no_bounds_check \
  wuffs_base__peek_u32le__no_bounds_check
#define wuffs_base__load_u40be__no_bounds_check \
  wuffs_base__peek_u40be__no_bounds_check
#define wuffs_base__load_u40le__no_bounds_check \
  wuffs_base__peek_u40le__no_bounds_check
#define wuffs_base__load_u48be__no_bounds_check \
  wuffs_base__peek_u48be__no_bounds_check
#define wuffs_base__load_u48le__no_bounds_check \
  wuffs_base__peek_u48le__no_bounds_check
#define wuffs_base__load_u56be__no_bounds_check \
  wuffs_base__peek_u56be__no_bounds_check
#define wuffs_base__load_u56le__no_bounds_check \
  wuffs_base__peek_u56le__no_bounds_check
#define wuffs_base__load_u64be__no_bounds_check \
  wuffs_base__peek_u64be__no_bounds_check
#define wuffs_base__load_u64le__no_bounds_check \
  wuffs_base__peek_u64le__no_bounds_check

#define wuffs_base__store_u8__no_bounds_check \
  wuffs_base__poke_u8__no_bounds_check
#define wuffs_base__store_u16be__no_bounds_check \
  wuffs_base__poke_u16be__no_bounds_check
#define wuffs_base__store_u16le__no_bounds_check \
  wuffs_base__poke_u16le__no_bounds_check
#define wuffs_base__store_u24be__no_bounds_check \
  wuffs_base__poke_u24be__no_bounds_check
#define wuffs_base__store_u24le__no_bounds_check \
  wuffs_base__poke_u24le__no_bounds_check
#define wuffs_base__store_u32be__no_bounds_check \
  wuffs_base__poke_u32be__no_bounds_check
#define wuffs_base__store_u32le__no_bounds_check \
  wuffs_base__poke_u32le__no_bounds_check
#define wuffs_base__store_u40be__no_bounds_check \
  wuffs_base__poke_u40be__no_bounds_check
#define wuffs_base__store_u40le__no_bounds_check \
  wuffs_base__poke_u40le__no_bounds_check
#define wuffs_base__store_u48be__no_bounds_check \
  wuffs_base__poke_u48be__no_bounds_check
#define wuffs_base__store_u48le__no_bounds_check \
  wuffs_base__poke_u48le__no_bounds_check
#define wuffs_base__store_u56be__no_bounds_check \
  wuffs_base__poke_u56be__no_bounds_check
#define wuffs_base__store_u56le__no_bounds_check \
  wuffs_base__poke_u56le__no_bounds_check
#define wuffs_base__store_u64be__no_bounds_check \
  wuffs_base__poke_u64be__no_bounds_check
#define wuffs_base__store_u64le__no_bounds_check \
  wuffs_base__poke_u64le__no_bounds_check

// ---------------- Slices and Tables

// WUFFS_BASE__SLICE is a 1-dimensional buffer.
//
// len measures a number of elements, not necessarily a size in bytes.
//
// A value with all fields NULL or zero is a valid, empty slice.
#define WUFFS_BASE__SLICE(T) \
  struct {                   \
    T* ptr;                  \
    size_t len;              \
  }

// WUFFS_BASE__TABLE is a 2-dimensional buffer.
//
// width height, and stride measure a number of elements, not necessarily a
// size in bytes.
//
// A value with all fields NULL or zero is a valid, empty table.
#define WUFFS_BASE__TABLE(T) \
  struct {                   \
    T* ptr;                  \
    size_t width;            \
    size_t height;           \
    size_t stride;           \
  }

typedef WUFFS_BASE__SLICE(uint8_t) wuffs_base__slice_u8;
typedef WUFFS_BASE__SLICE(uint16_t) wuffs_base__slice_u16;
typedef WUFFS_BASE__SLICE(uint32_t) wuffs_base__slice_u32;
typedef WUFFS_BASE__SLICE(uint64_t) wuffs_base__slice_u64;

typedef WUFFS_BASE__TABLE(uint8_t) wuffs_base__table_u8;
typedef WUFFS_BASE__TABLE(uint16_t) wuffs_base__table_u16;
typedef WUFFS_BASE__TABLE(uint32_t) wuffs_base__table_u32;
typedef WUFFS_BASE__TABLE(uint64_t) wuffs_base__table_u64;

static inline wuffs_base__slice_u8  //
wuffs_base__make_slice_u8(uint8_t* ptr, size_t len) {
  wuffs_base__slice_u8 ret;
  ret.ptr = ptr;
  ret.len = len;
  return ret;
}

static inline wuffs_base__slice_u16  //
wuffs_base__make_slice_u16(uint16_t* ptr, size_t len) {
  wuffs_base__slice_u16 ret;
  ret.ptr = ptr;
  ret.len = len;
  return ret;
}

static inline wuffs_base__slice_u32  //
wuffs_base__make_slice_u32(uint32_t* ptr, size_t len) {
  wuffs_base__slice_u32 ret;
  ret.ptr = ptr;
  ret.len = len;
  return ret;
}

static inline wuffs_base__slice_u64  //
wuffs_base__make_slice_u64(uint64_t* ptr, size_t len) {
  wuffs_base__slice_u64 ret;
  ret.ptr = ptr;
  ret.len = len;
  return ret;
}

static inline wuffs_base__slice_u8  //
wuffs_base__empty_slice_u8() {
  wuffs_base__slice_u8 ret;
  ret.ptr = NULL;
  ret.len = 0;
  return ret;
}

static inline wuffs_base__slice_u16  //
wuffs_base__empty_slice_u16() {
  wuffs_base__slice_u16 ret;
  ret.ptr = NULL;
  ret.len = 0;
  return ret;
}

static inline wuffs_base__slice_u32  //
wuffs_base__empty_slice_u32() {
  wuffs_base__slice_u32 ret;
  ret.ptr = NULL;
  ret.len = 0;
  return ret;
}

static inline wuffs_base__slice_u64  //
wuffs_base__empty_slice_u64() {
  wuffs_base__slice_u64 ret;
  ret.ptr = NULL;
  ret.len = 0;
  return ret;
}

static inline wuffs_base__table_u8  //
wuffs_base__empty_table_u8() {
  wuffs_base__table_u8 ret;
  ret.ptr = NULL;
  ret.width = 0;
  ret.height = 0;
  ret.stride = 0;
  return ret;
}

static inline wuffs_base__table_u16  //
wuffs_base__empty_table_u16() {
  wuffs_base__table_u16 ret;
  ret.ptr = NULL;
  ret.width = 0;
  ret.height = 0;
  ret.stride = 0;
  return ret;
}

static inline wuffs_base__table_u32  //
wuffs_base__empty_table_u32() {
  wuffs_base__table_u32 ret;
  ret.ptr = NULL;
  ret.width = 0;
  ret.height = 0;
  ret.stride = 0;
  return ret;
}

static inline wuffs_base__table_u64  //
wuffs_base__empty_table_u64() {
  wuffs_base__table_u64 ret;
  ret.ptr = NULL;
  ret.width = 0;
  ret.height = 0;
  ret.stride = 0;
  return ret;
}

static inline bool  //
wuffs_base__slice_u8__overlaps(wuffs_base__slice_u8 s, wuffs_base__slice_u8 t) {
  return ((s.ptr <= t.ptr) && (t.ptr < (s.ptr + s.len))) ||
         ((t.ptr <= s.ptr) && (s.ptr < (t.ptr + t.len)));
}

// wuffs_base__slice_u8__subslice_i returns s[i:].
//
// It returns an empty slice if i is out of bounds.
static inline wuffs_base__slice_u8  //
wuffs_base__slice_u8__subslice_i(wuffs_base__slice_u8 s, uint64_t i) {
  if ((i <= SIZE_MAX) && (i <= s.len)) {
    return wuffs_base__make_slice_u8(s.ptr + i, ((size_t)(s.len - i)));
  }
  return wuffs_base__make_slice_u8(NULL, 0);
}

// wuffs_base__slice_u8__subslice_j returns s[:j].
//
// It returns an empty slice if j is out of bounds.
static inline wuffs_base__slice_u8  //
wuffs_base__slice_u8__subslice_j(wuffs_base__slice_u8 s, uint64_t j) {
  if ((j <= SIZE_MAX) && (j <= s.len)) {
    return wuffs_base__make_slice_u8(s.ptr, ((size_t)j));
  }
  return wuffs_base__make_slice_u8(NULL, 0);
}

// wuffs_base__slice_u8__subslice_ij returns s[i:j].
//
// It returns an empty slice if i or j is out of bounds.
static inline wuffs_base__slice_u8  //
wuffs_base__slice_u8__subslice_ij(wuffs_base__slice_u8 s,
                                  uint64_t i,
                                  uint64_t j) {
  if ((i <= j) && (j <= SIZE_MAX) && (j <= s.len)) {
    return wuffs_base__make_slice_u8(s.ptr + i, ((size_t)(j - i)));
  }
  return wuffs_base__make_slice_u8(NULL, 0);
}

// ---------------- Magic Numbers

// wuffs_base__magic_number_guess_fourcc guesses the file format of some data,
// given its opening bytes. It returns a positive FourCC value on success.
//
// It returns zero if nothing matches its hard-coded list of 'magic numbers'.
//
// It returns a negative value if a longer prefix is required for a conclusive
// result. For example, seeing a single 'B' byte is not enough to discriminate
// the BMP and BPG image file formats.
//
// It does not do a full validity check. Like any guess made from a short
// prefix of the data, it may return false positives. Data that starts with 99
// bytes of valid JPEG followed by corruption or truncation is an invalid JPEG
// image overall, but this function will still return WUFFS_BASE__FOURCC__JPEG.
//
// Another source of false positives is that some 'magic numbers' are valid
// ASCII data. A file starting with "GIF87a and GIF89a are the two versions of
// GIF" will match GIF's 'magic number' even if it's plain text, not an image.
//
// For modular builds that divide the base module into sub-modules, using this
// function requires the WUFFS_CONFIG__MODULE__BASE__MAGIC sub-module, not just
// WUFFS_CONFIG__MODULE__BASE__CORE.
WUFFS_BASE__MAYBE_STATIC int32_t  //
wuffs_base__magic_number_guess_fourcc(wuffs_base__slice_u8 prefix);

// ---------------- Ranges and Rects

// See https://github.com/google/wuffs/blob/main/doc/note/ranges-and-rects.md

typedef struct wuffs_base__range_ii_u32__struct {
  uint32_t min_incl;
  uint32_t max_incl;

#ifdef __cplusplus
  inline bool is_empty() const;
  inline bool equals(wuffs_base__range_ii_u32__struct s) const;
  inline wuffs_base__range_ii_u32__struct intersect(
      wuffs_base__range_ii_u32__struct s) const;
  inline wuffs_base__range_ii_u32__struct unite(
      wuffs_base__range_ii_u32__struct s) const;
  inline bool contains(uint32_t x) const;
  inline bool contains_range(wuffs_base__range_ii_u32__struct s) const;
#endif  // __cplusplus

} wuffs_base__range_ii_u32;

static inline wuffs_base__range_ii_u32  //
wuffs_base__empty_range_ii_u32() {
  wuffs_base__range_ii_u32 ret;
  ret.min_incl = 0;
  ret.max_incl = 0;
  return ret;
}

static inline wuffs_base__range_ii_u32  //
wuffs_base__make_range_ii_u32(uint32_t min_incl, uint32_t max_incl) {
  wuffs_base__range_ii_u32 ret;
  ret.min_incl = min_incl;
  ret.max_incl = max_incl;
  return ret;
}

static inline bool  //
wuffs_base__range_ii_u32__is_empty(const wuffs_base__range_ii_u32* r) {
  return r->min_incl > r->max_incl;
}

static inline bool  //
wuffs_base__range_ii_u32__equals(const wuffs_base__range_ii_u32* r,
                                 wuffs_base__range_ii_u32 s) {
  return (r->min_incl == s.min_incl && r->max_incl == s.max_incl) ||
         (wuffs_base__range_ii_u32__is_empty(r) &&
          wuffs_base__range_ii_u32__is_empty(&s));
}

static inline wuffs_base__range_ii_u32  //
wuffs_base__range_ii_u32__intersect(const wuffs_base__range_ii_u32* r,
                                    wuffs_base__range_ii_u32 s) {
  wuffs_base__range_ii_u32 t;
  t.min_incl = wuffs_base__u32__max(r->min_incl, s.min_incl);
  t.max_incl = wuffs_base__u32__min(r->max_incl, s.max_incl);
  return t;
}

static inline wuffs_base__range_ii_u32  //
wuffs_base__range_ii_u32__unite(const wuffs_base__range_ii_u32* r,
                                wuffs_base__range_ii_u32 s) {
  if (wuffs_base__range_ii_u32__is_empty(r)) {
    return s;
  }
  if (wuffs_base__range_ii_u32__is_empty(&s)) {
    return *r;
  }
  wuffs_base__range_ii_u32 t;
  t.min_incl = wuffs_base__u32__min(r->min_incl, s.min_incl);
  t.max_incl = wuffs_base__u32__max(r->max_incl, s.max_incl);
  return t;
}

static inline bool  //
wuffs_base__range_ii_u32__contains(const wuffs_base__range_ii_u32* r,
                                   uint32_t x) {
  return (r->min_incl <= x) && (x <= r->max_incl);
}

static inline bool  //
wuffs_base__range_ii_u32__contains_range(const wuffs_base__range_ii_u32* r,
                                         wuffs_base__range_ii_u32 s) {
  return wuffs_base__range_ii_u32__equals(
      &s, wuffs_base__range_ii_u32__intersect(r, s));
}

#ifdef __cplusplus

inline bool  //
wuffs_base__range_ii_u32::is_empty() const {
  return wuffs_base__range_ii_u32__is_empty(this);
}

inline bool  //
wuffs_base__range_ii_u32::equals(wuffs_base__range_ii_u32 s) const {
  return wuffs_base__range_ii_u32__equals(this, s);
}

inline wuffs_base__range_ii_u32  //
wuffs_base__range_ii_u32::intersect(wuffs_base__range_ii_u32 s) const {
  return wuffs_base__range_ii_u32__intersect(this, s);
}

inline wuffs_base__range_ii_u32  //
wuffs_base__range_ii_u32::unite(wuffs_base__range_ii_u32 s) const {
  return wuffs_base__range_ii_u32__unite(this, s);
}

inline bool  //
wuffs_base__range_ii_u32::contains(uint32_t x) const {
  return wuffs_base__range_ii_u32__contains(this, x);
}

inline bool  //
wuffs_base__range_ii_u32::contains_range(wuffs_base__range_ii_u32 s) const {
  return wuffs_base__range_ii_u32__contains_range(this, s);
}

#endif  // __cplusplus

// --------

typedef struct wuffs_base__range_ie_u32__struct {
  uint32_t min_incl;
  uint32_t max_excl;

#ifdef __cplusplus
  inline bool is_empty() const;
  inline bool equals(wuffs_base__range_ie_u32__struct s) const;
  inline wuffs_base__range_ie_u32__struct intersect(
      wuffs_base__range_ie_u32__struct s) const;
  inline wuffs_base__range_ie_u32__struct unite(
      wuffs_base__range_ie_u32__struct s) const;
  inline bool contains(uint32_t x) const;
  inline bool contains_range(wuffs_base__range_ie_u32__struct s) const;
  inline uint32_t length() const;
#endif  // __cplusplus

} wuffs_base__range_ie_u32;

static inline wuffs_base__range_ie_u32  //
wuffs_base__empty_range_ie_u32() {
  wuffs_base__range_ie_u32 ret;
  ret.min_incl = 0;
  ret.max_excl = 0;
  return ret;
}

static inline wuffs_base__range_ie_u32  //
wuffs_base__make_range_ie_u32(uint32_t min_incl, uint32_t max_excl) {
  wuffs_base__range_ie_u32 ret;
  ret.min_incl = min_incl;
  ret.max_excl = max_excl;
  return ret;
}

static inline bool  //
wuffs_base__range_ie_u32__is_empty(const wuffs_base__range_ie_u32* r) {
  return r->min_incl >= r->max_excl;
}

static inline bool  //
wuffs_base__range_ie_u32__equals(const wuffs_base__range_ie_u32* r,
                                 wuffs_base__range_ie_u32 s) {
  return (r->min_incl == s.min_incl && r->max_excl == s.max_excl) ||
         (wuffs_base__range_ie_u32__is_empty(r) &&
          wuffs_base__range_ie_u32__is_empty(&s));
}

static inline wuffs_base__range_ie_u32  //
wuffs_base__range_ie_u32__intersect(const wuffs_base__range_ie_u32* r,
                                    wuffs_base__range_ie_u32 s) {
  wuffs_base__range_ie_u32 t;
  t.min_incl = wuffs_base__u32__max(r->min_incl, s.min_incl);
  t.max_excl = wuffs_base__u32__min(r->max_excl, s.max_excl);
  return t;
}

static inline wuffs_base__range_ie_u32  //
wuffs_base__range_ie_u32__unite(const wuffs_base__range_ie_u32* r,
                                wuffs_base__range_ie_u32 s) {
  if (wuffs_base__range_ie_u32__is_empty(r)) {
    return s;
  }
  if (wuffs_base__range_ie_u32__is_empty(&s)) {
    return *r;
  }
  wuffs_base__range_ie_u32 t;
  t.min_incl = wuffs_base__u32__min(r->min_incl, s.min_incl);
  t.max_excl = wuffs_base__u32__max(r->max_excl, s.max_excl);
  return t;
}

static inline bool  //
wuffs_base__range_ie_u32__contains(const wuffs_base__range_ie_u32* r,
                                   uint32_t x) {
  return (r->min_incl <= x) && (x < r->max_excl);
}

static inline bool  //
wuffs_base__range_ie_u32__contains_range(const wuffs_base__range_ie_u32* r,
                                         wuffs_base__range_ie_u32 s) {
  return wuffs_base__range_ie_u32__equals(
      &s, wuffs_base__range_ie_u32__intersect(r, s));
}

static inline uint32_t  //
wuffs_base__range_ie_u32__length(const wuffs_base__range_ie_u32* r) {
  return wuffs_base__u32__sat_sub(r->max_excl, r->min_incl);
}

#ifdef __cplusplus

inline bool  //
wuffs_base__range_ie_u32::is_empty() const {
  return wuffs_base__range_ie_u32__is_empty(this);
}

inline bool  //
wuffs_base__range_ie_u32::equals(wuffs_base__range_ie_u32 s) const {
  return wuffs_base__range_ie_u32__equals(this, s);
}

inline wuffs_base__range_ie_u32  //
wuffs_base__range_ie_u32::intersect(wuffs_base__range_ie_u32 s) const {
  return wuffs_base__range_ie_u32__intersect(this, s);
}

inline wuffs_base__range_ie_u32  //
wuffs_base__range_ie_u32::unite(wuffs_base__range_ie_u32 s) const {
  return wuffs_base__range_ie_u32__unite(this, s);
}

inline bool  //
wuffs_base__range_ie_u32::contains(uint32_t x) const {
  return wuffs_base__range_ie_u32__contains(this, x);
}

inline bool  //
wuffs_base__range_ie_u32::contains_range(wuffs_base__range_ie_u32 s) const {
  return wuffs_base__range_ie_u32__contains_range(this, s);
}

inline uint32_t  //
wuffs_base__range_ie_u32::length() const {
  return wuffs_base__range_ie_u32__length(this);
}

#endif  // __cplusplus

// --------

typedef struct wuffs_base__range_ii_u64__struct {
  uint64_t min_incl;
  uint64_t max_incl;

#ifdef __cplusplus
  inline bool is_empty() const;
  inline bool equals(wuffs_base__range_ii_u64__struct s) const;
  inline wuffs_base__range_ii_u64__struct intersect(
      wuffs_base__range_ii_u64__struct s) const;
  inline wuffs_base__range_ii_u64__struct unite(
      wuffs_base__range_ii_u64__struct s) const;
  inline bool contains(uint64_t x) const;
  inline bool contains_range(wuffs_base__range_ii_u64__struct s) const;
#endif  // __cplusplus

} wuffs_base__range_ii_u64;

static inline wuffs_base__range_ii_u64  //
wuffs_base__empty_range_ii_u64() {
  wuffs_base__range_ii_u64 ret;
  ret.min_incl = 0;
  ret.max_incl = 0;
  return ret;
}

static inline wuffs_base__range_ii_u64  //
wuffs_base__make_range_ii_u64(uint64_t min_incl, uint64_t max_incl) {
  wuffs_base__range_ii_u64 ret;
  ret.min_incl = min_incl;
  ret.max_incl = max_incl;
  return ret;
}

static inline bool  //
wuffs_base__range_ii_u64__is_empty(const wuffs_base__range_ii_u64* r) {
  return r->min_incl > r->max_incl;
}

static inline bool  //
wuffs_base__range_ii_u64__equals(const wuffs_base__range_ii_u64* r,
                                 wuffs_base__range_ii_u64 s) {
  return (r->min_incl == s.min_incl && r->max_incl == s.max_incl) ||
         (wuffs_base__range_ii_u64__is_empty(r) &&
          wuffs_base__range_ii_u64__is_empty(&s));
}

static inline wuffs_base__range_ii_u64  //
wuffs_base__range_ii_u64__intersect(const wuffs_base__range_ii_u64* r,
                                    wuffs_base__range_ii_u64 s) {
  wuffs_base__range_ii_u64 t;
  t.min_incl = wuffs_base__u64__max(r->min_incl, s.min_incl);
  t.max_incl = wuffs_base__u64__min(r->max_incl, s.max_incl);
  return t;
}

static inline wuffs_base__range_ii_u64  //
wuffs_base__range_ii_u64__unite(const wuffs_base__range_ii_u64* r,
                                wuffs_base__range_ii_u64 s) {
  if (wuffs_base__range_ii_u64__is_empty(r)) {
    return s;
  }
  if (wuffs_base__range_ii_u64__is_empty(&s)) {
    return *r;
  }
  wuffs_base__range_ii_u64 t;
  t.min_incl = wuffs_base__u64__min(r->min_incl, s.min_incl);
  t.max_incl = wuffs_base__u64__max(r->max_incl, s.max_incl);
  return t;
}

static inline bool  //
wuffs_base__range_ii_u64__contains(const wuffs_base__range_ii_u64* r,
                                   uint64_t x) {
  return (r->min_incl <= x) && (x <= r->max_incl);
}

static inline bool  //
wuffs_base__range_ii_u64__contains_range(const wuffs_base__range_ii_u64* r,
                                         wuffs_base__range_ii_u64 s) {
  return wuffs_base__range_ii_u64__equals(
      &s, wuffs_base__range_ii_u64__intersect(r, s));
}

#ifdef __cplusplus

inline bool  //
wuffs_base__range_ii_u64::is_empty() const {
  return wuffs_base__range_ii_u64__is_empty(this);
}

inline bool  //
wuffs_base__range_ii_u64::equals(wuffs_base__range_ii_u64 s) const {
  return wuffs_base__range_ii_u64__equals(this, s);
}

inline wuffs_base__range_ii_u64  //
wuffs_base__range_ii_u64::intersect(wuffs_base__range_ii_u64 s) const {
  return wuffs_base__range_ii_u64__intersect(this, s);
}

inline wuffs_base__range_ii_u64  //
wuffs_base__range_ii_u64::unite(wuffs_base__range_ii_u64 s) const {
  return wuffs_base__range_ii_u64__unite(this, s);
}

inline bool  //
wuffs_base__range_ii_u64::contains(uint64_t x) const {
  return wuffs_base__range_ii_u64__contains(this, x);
}

inline bool  //
wuffs_base__range_ii_u64::contains_range(wuffs_base__range_ii_u64 s) const {
  return wuffs_base__range_ii_u64__contains_range(this, s);
}

#endif  // __cplusplus

// --------

typedef struct wuffs_base__range_ie_u64__struct {
  uint64_t min_incl;
  uint64_t max_excl;

#ifdef __cplusplus
  inline bool is_empty() const;
  inline bool equals(wuffs_base__range_ie_u64__struct s) const;
  inline wuffs_base__range_ie_u64__struct intersect(
      wuffs_base__range_ie_u64__struct s) const;
  inline wuffs_base__range_ie_u64__struct unite(
      wuffs_base__range_ie_u64__struct s) const;
  inline bool contains(uint64_t x) const;
  inline bool contains_range(wuffs_base__range_ie_u64__struct s) const;
  inline uint64_t length() const;
#endif  // __cplusplus

} wuffs_base__range_ie_u64;

static inline wuffs_base__range_ie_u64  //
wuffs_base__empty_range_ie_u64() {
  wuffs_base__range_ie_u64 ret;
  ret.min_incl = 0;
  ret.max_excl = 0;
  return ret;
}

static inline wuffs_base__range_ie_u64  //
wuffs_base__make_range_ie_u64(uint64_t min_incl, uint64_t max_excl) {
  wuffs_base__range_ie_u64 ret;
  ret.min_incl = min_incl;
  ret.max_excl = max_excl;
  return ret;
}

static inline bool  //
wuffs_base__range_ie_u64__is_empty(const wuffs_base__range_ie_u64* r) {
  return r->min_incl >= r->max_excl;
}

static inline bool  //
wuffs_base__range_ie_u64__equals(const wuffs_base__range_ie_u64* r,
                                 wuffs_base__range_ie_u64 s) {
  return (r->min_incl == s.min_incl && r->max_excl == s.max_excl) ||
         (wuffs_base__range_ie_u64__is_empty(r) &&
          wuffs_base__range_ie_u64__is_empty(&s));
}

static inline wuffs_base__range_ie_u64  //
wuffs_base__range_ie_u64__intersect(const wuffs_base__range_ie_u64* r,
                                    wuffs_base__range_ie_u64 s) {
  wuffs_base__range_ie_u64 t;
  t.min_incl = wuffs_base__u64__max(r->min_incl, s.min_incl);
  t.max_excl = wuffs_base__u64__min(r->max_excl, s.max_excl);
  return t;
}

static inline wuffs_base__range_ie_u64  //
wuffs_base__range_ie_u64__unite(const wuffs_base__range_ie_u64* r,
                                wuffs_base__range_ie_u64 s) {
  if (wuffs_base__range_ie_u64__is_empty(r)) {
    return s;
  }
  if (wuffs_base__range_ie_u64__is_empty(&s)) {
    return *r;
  }
  wuffs_base__range_ie_u64 t;
  t.min_incl = wuffs_base__u64__min(r->min_incl, s.min_incl);
  t.max_excl = wuffs_base__u64__max(r->max_excl, s.max_excl);
  return t;
}

static inline bool  //
wuffs_base__range_ie_u64__contains(const wuffs_base__range_ie_u64* r,
                                   uint64_t x) {
  return (r->min_incl <= x) && (x < r->max_excl);
}

static inline bool  //
wuffs_base__range_ie_u64__contains_range(const wuffs_base__range_ie_u64* r,
                                         wuffs_base__range_ie_u64 s) {
  return wuffs_base__range_ie_u64__equals(
      &s, wuffs_base__range_ie_u64__intersect(r, s));
}

static inline uint64_t  //
wuffs_base__range_ie_u64__length(const wuffs_base__range_ie_u64* r) {
  return wuffs_base__u64__sat_sub(r->max_excl, r->min_incl);
}

#ifdef __cplusplus

inline bool  //
wuffs_base__range_ie_u64::is_empty() const {
  return wuffs_base__range_ie_u64__is_empty(this);
}

inline bool  //
wuffs_base__range_ie_u64::equals(wuffs_base__range_ie_u64 s) const {
  return wuffs_base__range_ie_u64__equals(this, s);
}

inline wuffs_base__range_ie_u64  //
wuffs_base__range_ie_u64::intersect(wuffs_base__range_ie_u64 s) const {
  return wuffs_base__range_ie_u64__intersect(this, s);
}

inline wuffs_base__range_ie_u64  //
wuffs_base__range_ie_u64::unite(wuffs_base__range_ie_u64 s) const {
  return wuffs_base__range_ie_u64__unite(this, s);
}

inline bool  //
wuffs_base__range_ie_u64::contains(uint64_t x) const {
  return wuffs_base__range_ie_u64__contains(this, x);
}

inline bool  //
wuffs_base__range_ie_u64::contains_range(wuffs_base__range_ie_u64 s) const {
  return wuffs_base__range_ie_u64__contains_range(this, s);
}

inline uint64_t  //
wuffs_base__range_ie_u64::length() const {
  return wuffs_base__range_ie_u64__length(this);
}

#endif  // __cplusplus

// --------

typedef struct wuffs_base__rect_ii_u32__struct {
  uint32_t min_incl_x;
  uint32_t min_incl_y;
  uint32_t max_incl_x;
  uint32_t max_incl_y;

#ifdef __cplusplus
  inline bool is_empty() const;
  inline bool equals(wuffs_base__rect_ii_u32__struct s) const;
  inline wuffs_base__rect_ii_u32__struct intersect(
      wuffs_base__rect_ii_u32__struct s) const;
  inline wuffs_base__rect_ii_u32__struct unite(
      wuffs_base__rect_ii_u32__struct s) const;
  inline bool contains(uint32_t x, uint32_t y) const;
  inline bool contains_rect(wuffs_base__rect_ii_u32__struct s) const;
#endif  // __cplusplus

} wuffs_base__rect_ii_u32;

static inline wuffs_base__rect_ii_u32  //
wuffs_base__empty_rect_ii_u32() {
  wuffs_base__rect_ii_u32 ret;
  ret.min_incl_x = 0;
  ret.min_incl_y = 0;
  ret.max_incl_x = 0;
  ret.max_incl_y = 0;
  return ret;
}

static inline wuffs_base__rect_ii_u32  //
wuffs_base__make_rect_ii_u32(uint32_t min_incl_x,
                             uint32_t min_incl_y,
                             uint32_t max_incl_x,
                             uint32_t max_incl_y) {
  wuffs_base__rect_ii_u32 ret;
  ret.min_incl_x = min_incl_x;
  ret.min_incl_y = min_incl_y;
  ret.max_incl_x = max_incl_x;
  ret.max_incl_y = max_incl_y;
  return ret;
}

static inline bool  //
wuffs_base__rect_ii_u32__is_empty(const wuffs_base__rect_ii_u32* r) {
  return (r->min_incl_x > r->max_incl_x) || (r->min_incl_y > r->max_incl_y);
}

static inline bool  //
wuffs_base__rect_ii_u32__equals(const wuffs_base__rect_ii_u32* r,
                                wuffs_base__rect_ii_u32 s) {
  return (r->min_incl_x == s.min_incl_x && r->min_incl_y == s.min_incl_y &&
          r->max_incl_x == s.max_incl_x && r->max_incl_y == s.max_incl_y) ||
         (wuffs_base__rect_ii_u32__is_empty(r) &&
          wuffs_base__rect_ii_u32__is_empty(&s));
}

static inline wuffs_base__rect_ii_u32  //
wuffs_base__rect_ii_u32__intersect(const wuffs_base__rect_ii_u32* r,
                                   wuffs_base__rect_ii_u32 s) {
  wuffs_base__rect_ii_u32 t;
  t.min_incl_x = wuffs_base__u32__max(r->min_incl_x, s.min_incl_x);
  t.min_incl_y = wuffs_base__u32__max(r->min_incl_y, s.min_incl_y);
  t.max_incl_x = wuffs_base__u32__min(r->max_incl_x, s.max_incl_x);
  t.max_incl_y = wuffs_base__u32__min(r->max_incl_y, s.max_incl_y);
  return t;
}

static inline wuffs_base__rect_ii_u32  //
wuffs_base__rect_ii_u32__unite(const wuffs_base__rect_ii_u32* r,
                               wuffs_base__rect_ii_u32 s) {
  if (wuffs_base__rect_ii_u32__is_empty(r)) {
    return s;
  }
  if (wuffs_base__rect_ii_u32__is_empty(&s)) {
    return *r;
  }
  wuffs_base__rect_ii_u32 t;
  t.min_incl_x = wuffs_base__u32__min(r->min_incl_x, s.min_incl_x);
  t.min_incl_y = wuffs_base__u32__min(r->min_incl_y, s.min_incl_y);
  t.max_incl_x = wuffs_base__u32__max(r->max_incl_x, s.max_incl_x);
  t.max_incl_y = wuffs_base__u32__max(r->max_incl_y, s.max_incl_y);
  return t;
}

static inline bool  //
wuffs_base__rect_ii_u32__contains(const wuffs_base__rect_ii_u32* r,
                                  uint32_t x,
                                  uint32_t y) {
  return (r->min_incl_x <= x) && (x <= r->max_incl_x) && (r->min_incl_y <= y) &&
         (y <= r->max_incl_y);
}

static inline bool  //
wuffs_base__rect_ii_u32__contains_rect(const wuffs_base__rect_ii_u32* r,
                                       wuffs_base__rect_ii_u32 s) {
  return wuffs_base__rect_ii_u32__equals(
      &s, wuffs_base__rect_ii_u32__intersect(r, s));
}

#ifdef __cplusplus

inline bool  //
wuffs_base__rect_ii_u32::is_empty() const {
  return wuffs_base__rect_ii_u32__is_empty(this);
}

inline bool  //
wuffs_base__rect_ii_u32::equals(wuffs_base__rect_ii_u32 s) const {
  return wuffs_base__rect_ii_u32__equals(this, s);
}

inline wuffs_base__rect_ii_u32  //
wuffs_base__rect_ii_u32::intersect(wuffs_base__rect_ii_u32 s) const {
  return wuffs_base__rect_ii_u32__intersect(this, s);
}

inline wuffs_base__rect_ii_u32  //
wuffs_base__rect_ii_u32::unite(wuffs_base__rect_ii_u32 s) const {
  return wuffs_base__rect_ii_u32__unite(this, s);
}

inline bool  //
wuffs_base__rect_ii_u32::contains(uint32_t x, uint32_t y) const {
  return wuffs_base__rect_ii_u32__contains(this, x, y);
}

inline bool  //
wuffs_base__rect_ii_u32::contains_rect(wuffs_base__rect_ii_u32 s) const {
  return wuffs_base__rect_ii_u32__contains_rect(this, s);
}

#endif  // __cplusplus

// --------

typedef struct wuffs_base__rect_ie_u32__struct {
  uint32_t min_incl_x;
  uint32_t min_incl_y;
  uint32_t max_excl_x;
  uint32_t max_excl_y;

#ifdef __cplusplus
  inline bool is_empty() const;
  inline bool equals(wuffs_base__rect_ie_u32__struct s) const;
  inline wuffs_base__rect_ie_u32__struct intersect(
      wuffs_base__rect_ie_u32__struct s) const;
  inline wuffs_base__rect_ie_u32__struct unite(
      wuffs_base__rect_ie_u32__struct s) const;
  inline bool contains(uint32_t x, uint32_t y) const;
  inline bool contains_rect(wuffs_base__rect_ie_u32__struct s) const;
  inline uint32_t width() const;
  inline uint32_t height() const;
#endif  // __cplusplus

} wuffs_base__rect_ie_u32;

static inline wuffs_base__rect_ie_u32  //
wuffs_base__empty_rect_ie_u32() {
  wuffs_base__rect_ie_u32 ret;
  ret.min_incl_x = 0;
  ret.min_incl_y = 0;
  ret.max_excl_x = 0;
  ret.max_excl_y = 0;
  return ret;
}

static inline wuffs_base__rect_ie_u32  //
wuffs_base__make_rect_ie_u32(uint32_t min_incl_x,
                             uint32_t min_incl_y,
                             uint32_t max_excl_x,
                             uint32_t max_excl_y) {
  wuffs_base__rect_ie_u32 ret;
  ret.min_incl_x = min_incl_x;
  ret.min_incl_y = min_incl_y;
  ret.max_excl_x = max_excl_x;
  ret.max_excl_y = max_excl_y;
  return ret;
}

static inline bool  //
wuffs_base__rect_ie_u32__is_empty(const wuffs_base__rect_ie_u32* r) {
  return (r->min_incl_x >= r->max_excl_x) || (r->min_incl_y >= r->max_excl_y);
}

static inline bool  //
wuffs_base__rect_ie_u32__equals(const wuffs_base__rect_ie_u32* r,
                                wuffs_base__rect_ie_u32 s) {
  return (r->min_incl_x == s.min_incl_x && r->min_incl_y == s.min_incl_y &&
          r->max_excl_x == s.max_excl_x && r->max_excl_y == s.max_excl_y) ||
         (wuffs_base__rect_ie_u32__is_empty(r) &&
          wuffs_base__rect_ie_u32__is_empty(&s));
}

static inline wuffs_base__rect_ie_u32  //
wuffs_base__rect_ie_u32__intersect(const wuffs_base__rect_ie_u32* r,
                                   wuffs_base__rect_ie_u32 s) {
  wuffs_base__rect_ie_u32 t;
  t.min_incl_x = wuffs_base__u32__max(r->min_incl_x, s.min_incl_x);
  t.min_incl_y = wuffs_base__u32__max(r->min_incl_y, s.min_incl_y);
  t.max_excl_x = wuffs_base__u32__min(r->max_excl_x, s.max_excl_x);
  t.max_excl_y = wuffs_base__u32__min(r->max_excl_y, s.max_excl_y);
  return t;
}

static inline wuffs_base__rect_ie_u32  //
wuffs_base__rect_ie_u32__unite(const wuffs_base__rect_ie_u32* r,
                               wuffs_base__rect_ie_u32 s) {
  if (wuffs_base__rect_ie_u32__is_empty(r)) {
    return s;
  }
  if (wuffs_base__rect_ie_u32__is_empty(&s)) {
    return *r;
  }
  wuffs_base__rect_ie_u32 t;
  t.min_incl_x = wuffs_base__u32__min(r->min_incl_x, s.min_incl_x);
  t.min_incl_y = wuffs_base__u32__min(r->min_incl_y, s.min_incl_y);
  t.max_excl_x = wuffs_base__u32__max(r->max_excl_x, s.max_excl_x);
  t.max_excl_y = wuffs_base__u32__max(r->max_excl_y, s.max_excl_y);
  return t;
}

static inline bool  //
wuffs_base__rect_ie_u32__contains(const wuffs_base__rect_ie_u32* r,
                                  uint32_t x,
                                  uint32_t y) {
  return (r->min_incl_x <= x) && (x < r->max_excl_x) && (r->min_incl_y <= y) &&
         (y < r->max_excl_y);
}

static inline bool  //
wuffs_base__rect_ie_u32__contains_rect(const wuffs_base__rect_ie_u32* r,
                                       wuffs_base__rect_ie_u32 s) {
  return wuffs_base__rect_ie_u32__equals(
      &s, wuffs_base__rect_ie_u32__intersect(r, s));
}

static inline uint32_t  //
wuffs_base__rect_ie_u32__width(const wuffs_base__rect_ie_u32* r) {
  return wuffs_base__u32__sat_sub(r->max_excl_x, r->min_incl_x);
}

static inline uint32_t  //
wuffs_base__rect_ie_u32__height(const wuffs_base__rect_ie_u32* r) {
  return wuffs_base__u32__sat_sub(r->max_excl_y, r->min_incl_y);
}

#ifdef __cplusplus

inline bool  //
wuffs_base__rect_ie_u32::is_empty() const {
  return wuffs_base__rect_ie_u32__is_empty(this);
}

inline bool  //
wuffs_base__rect_ie_u32::equals(wuffs_base__rect_ie_u32 s) const {
  return wuffs_base__rect_ie_u32__equals(this, s);
}

inline wuffs_base__rect_ie_u32  //
wuffs_base__rect_ie_u32::intersect(wuffs_base__rect_ie_u32 s) const {
  return wuffs_base__rect_ie_u32__intersect(this, s);
}

inline wuffs_base__rect_ie_u32  //
wuffs_base__rect_ie_u32::unite(wuffs_base__rect_ie_u32 s) const {
  return wuffs_base__rect_ie_u32__unite(this, s);
}

inline bool  //
wuffs_base__rect_ie_u32::contains(uint32_t x, uint32_t y) const {
  return wuffs_base__rect_ie_u32__contains(this, x, y);
}

inline bool  //
wuffs_base__rect_ie_u32::contains_rect(wuffs_base__rect_ie_u32 s) const {
  return wuffs_base__rect_ie_u32__contains_rect(this, s);
}

inline uint32_t  //
wuffs_base__rect_ie_u32::width() const {
  return wuffs_base__rect_ie_u32__width(this);
}

inline uint32_t  //
wuffs_base__rect_ie_u32::height() const {
  return wuffs_base__rect_ie_u32__height(this);
}

#endif  // __cplusplus

// ---------------- More Information

// wuffs_base__more_information holds additional fields, typically when a Wuffs
// method returns a [note status](/doc/note/statuses.md).
//
// The flavor field follows the base38 namespace
// convention](/doc/note/base38-and-fourcc.md). The other fields' semantics
// depends on the flavor.
typedef struct wuffs_base__more_information__struct {
  uint32_t flavor;
  uint32_t w;
  uint64_t x;
  uint64_t y;
  uint64_t z;

#ifdef __cplusplus
  inline void set(uint32_t flavor_arg,
                  uint32_t w_arg,
                  uint64_t x_arg,
                  uint64_t y_arg,
                  uint64_t z_arg);
  inline uint32_t io_redirect__fourcc() const;
  inline wuffs_base__range_ie_u64 io_redirect__range() const;
  inline uint64_t io_seek__position() const;
  inline uint32_t metadata__fourcc() const;
  inline wuffs_base__range_ie_u64 metadata__range() const;
#endif  // __cplusplus

} wuffs_base__more_information;

#define WUFFS_BASE__MORE_INFORMATION__FLAVOR__IO_REDIRECT 1
#define WUFFS_BASE__MORE_INFORMATION__FLAVOR__IO_SEEK 2
#define WUFFS_BASE__MORE_INFORMATION__FLAVOR__METADATA 3

static inline wuffs_base__more_information  //
wuffs_base__empty_more_information() {
  wuffs_base__more_information ret;
  ret.flavor = 0;
  ret.w = 0;
  ret.x = 0;
  ret.y = 0;
  ret.z = 0;
  return ret;
}

static inline void  //
wuffs_base__more_information__set(wuffs_base__more_information* m,
                                  uint32_t flavor,
                                  uint32_t w,
                                  uint64_t x,
                                  uint64_t y,
                                  uint64_t z) {
  if (!m) {
    return;
  }
  m->flavor = flavor;
  m->w = w;
  m->x = x;
  m->y = y;
  m->z = z;
}

static inline uint32_t  //
wuffs_base__more_information__io_redirect__fourcc(
    const wuffs_base__more_information* m) {
  return m->w;
}

static inline wuffs_base__range_ie_u64  //
wuffs_base__more_information__io_redirect__range(
    const wuffs_base__more_information* m) {
  wuffs_base__range_ie_u64 ret;
  ret.min_incl = m->y;
  ret.max_excl = m->z;
  return ret;
}

static inline uint64_t  //
wuffs_base__more_information__io_seek__position(
    const wuffs_base__more_information* m) {
  return m->x;
}

static inline uint32_t  //
wuffs_base__more_information__metadata__fourcc(
    const wuffs_base__more_information* m) {
  return m->w;
}

static inline wuffs_base__range_ie_u64  //
wuffs_base__more_information__metadata__range(
    const wuffs_base__more_information* m) {
  wuffs_base__range_ie_u64 ret;
  ret.min_incl = m->y;
  ret.max_excl = m->z;
  return ret;
}

#ifdef __cplusplus

inline void  //
wuffs_base__more_information::set(uint32_t flavor_arg,
                                  uint32_t w_arg,
                                  uint64_t x_arg,
                                  uint64_t y_arg,
                                  uint64_t z_arg) {
  wuffs_base__more_information__set(this, flavor_arg, w_arg, x_arg, y_arg,
                                    z_arg);
}

inline uint32_t  //
wuffs_base__more_information::io_redirect__fourcc() const {
  return wuffs_base__more_information__io_redirect__fourcc(this);
}

inline wuffs_base__range_ie_u64  //
wuffs_base__more_information::io_redirect__range() const {
  return wuffs_base__more_information__io_redirect__range(this);
}

inline uint64_t  //
wuffs_base__more_information::io_seek__position() const {
  return wuffs_base__more_information__io_seek__position(this);
}

inline uint32_t  //
wuffs_base__more_information::metadata__fourcc() const {
  return wuffs_base__more_information__metadata__fourcc(this);
}

inline wuffs_base__range_ie_u64  //
wuffs_base__more_information::metadata__range() const {
  return wuffs_base__more_information__metadata__range(this);
}

#endif  // __cplusplus

// ---------------- I/O
//
// See (/doc/note/io-input-output.md).

// wuffs_base__io_buffer_meta is the metadata for a wuffs_base__io_buffer's
// data.
typedef struct wuffs_base__io_buffer_meta__struct {
  size_t wi;     // Write index. Invariant: wi <= len.
  size_t ri;     // Read  index. Invariant: ri <= wi.
  uint64_t pos;  // Buffer position (relative to the start of stream).
  bool closed;   // No further writes are expected.
} wuffs_base__io_buffer_meta;

// wuffs_base__io_buffer is a 1-dimensional buffer (a pointer and length) plus
// additional metadata.
//
// A value with all fields zero is a valid, empty buffer.
typedef struct wuffs_base__io_buffer__struct {
  wuffs_base__slice_u8 data;
  wuffs_base__io_buffer_meta meta;

#ifdef __cplusplus
  inline bool is_valid() const;
  inline void compact();
  inline size_t reader_length() const;
  inline uint8_t* reader_pointer() const;
  inline uint64_t reader_position() const;
  inline wuffs_base__slice_u8 reader_slice() const;
  inline size_t writer_length() const;
  inline uint8_t* writer_pointer() const;
  inline uint64_t writer_position() const;
  inline wuffs_base__slice_u8 writer_slice() const;

  // Deprecated: use reader_position.
  inline uint64_t reader_io_position() const;
  // Deprecated: use writer_position.
  inline uint64_t writer_io_position() const;
#endif  // __cplusplus

} wuffs_base__io_buffer;

static inline wuffs_base__io_buffer  //
wuffs_base__make_io_buffer(wuffs_base__slice_u8 data,
                           wuffs_base__io_buffer_meta meta) {
  wuffs_base__io_buffer ret;
  ret.data = data;
  ret.meta = meta;
  return ret;
}

static inline wuffs_base__io_buffer_meta  //
wuffs_base__make_io_buffer_meta(size_t wi,
                                size_t ri,
                                uint64_t pos,
                                bool closed) {
  wuffs_base__io_buffer_meta ret;
  ret.wi = wi;
  ret.ri = ri;
  ret.pos = pos;
  ret.closed = closed;
  return ret;
}

static inline wuffs_base__io_buffer  //
wuffs_base__ptr_u8__reader(uint8_t* ptr, size_t len, bool closed) {
  wuffs_base__io_buffer ret;
  ret.data.ptr = ptr;
  ret.data.len = len;
  ret.meta.wi = len;
  ret.meta.ri = 0;
  ret.meta.pos = 0;
  ret.meta.closed = closed;
  return ret;
}

static inline wuffs_base__io_buffer  //
wuffs_base__ptr_u8__writer(uint8_t* ptr, size_t len) {
  wuffs_base__io_buffer ret;
  ret.data.ptr = ptr;
  ret.data.len = len;
  ret.meta.wi = 0;
  ret.meta.ri = 0;
  ret.meta.pos = 0;
  ret.meta.closed = false;
  return ret;
}

static inline wuffs_base__io_buffer  //
wuffs_base__slice_u8__reader(wuffs_base__slice_u8 s, bool closed) {
  wuffs_base__io_buffer ret;
  ret.data.ptr = s.ptr;
  ret.data.len = s.len;
  ret.meta.wi = s.len;
  ret.meta.ri = 0;
  ret.meta.pos = 0;
  ret.meta.closed = closed;
  return ret;
}

static inline wuffs_base__io_buffer  //
wuffs_base__slice_u8__writer(wuffs_base__slice_u8 s) {
  wuffs_base__io_buffer ret;
  ret.data.ptr = s.ptr;
  ret.data.len = s.len;
  ret.meta.wi = 0;
  ret.meta.ri = 0;
  ret.meta.pos = 0;
  ret.meta.closed = false;
  return ret;
}

static inline wuffs_base__io_buffer  //
wuffs_base__empty_io_buffer() {
  wuffs_base__io_buffer ret;
  ret.data.ptr = NULL;
  ret.data.len = 0;
  ret.meta.wi = 0;
  ret.meta.ri = 0;
  ret.meta.pos = 0;
  ret.meta.closed = false;
  return ret;
}

static inline wuffs_base__io_buffer_meta  //
wuffs_base__empty_io_buffer_meta() {
  wuffs_base__io_buffer_meta ret;
  ret.wi = 0;
  ret.ri = 0;
  ret.pos = 0;
  ret.closed = false;
  return ret;
}

static inline bool  //
wuffs_base__io_buffer__is_valid(const wuffs_base__io_buffer* buf) {
  if (buf) {
    if (buf->data.ptr) {
      return (buf->meta.ri <= buf->meta.wi) && (buf->meta.wi <= buf->data.len);
    } else {
      return (buf->meta.ri == 0) && (buf->meta.wi == 0) && (buf->data.len == 0);
    }
  }
  return false;
}

// wuffs_base__io_buffer__compact moves any written but unread bytes to the
// start of the buffer.
static inline void  //
wuffs_base__io_buffer__compact(wuffs_base__io_buffer* buf) {
  if (!buf || (buf->meta.ri == 0)) {
    return;
  }
  buf->meta.pos = wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.ri);
  size_t n = buf->meta.wi - buf->meta.ri;
  if (n != 0) {
    memmove(buf->data.ptr, buf->data.ptr + buf->meta.ri, n);
  }
  buf->meta.wi = n;
  buf->meta.ri = 0;
}

// Deprecated. Use wuffs_base__io_buffer__reader_position.
static inline uint64_t  //
wuffs_base__io_buffer__reader_io_position(const wuffs_base__io_buffer* buf) {
  return buf ? wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.ri) : 0;
}

static inline size_t  //
wuffs_base__io_buffer__reader_length(const wuffs_base__io_buffer* buf) {
  return buf ? buf->meta.wi - buf->meta.ri : 0;
}

static inline uint8_t*  //
wuffs_base__io_buffer__reader_pointer(const wuffs_base__io_buffer* buf) {
  return buf ? (buf->data.ptr + buf->meta.ri) : NULL;
}

static inline uint64_t  //
wuffs_base__io_buffer__reader_position(const wuffs_base__io_buffer* buf) {
  return buf ? wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.ri) : 0;
}

static inline wuffs_base__slice_u8  //
wuffs_base__io_buffer__reader_slice(const wuffs_base__io_buffer* buf) {
  return buf ? wuffs_base__make_slice_u8(buf->data.ptr + buf->meta.ri,
                                         buf->meta.wi - buf->meta.ri)
             : wuffs_base__empty_slice_u8();
}

// Deprecated. Use wuffs_base__io_buffer__writer_position.
static inline uint64_t  //
wuffs_base__io_buffer__writer_io_position(const wuffs_base__io_buffer* buf) {
  return buf ? wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.wi) : 0;
}

static inline size_t  //
wuffs_base__io_buffer__writer_length(const wuffs_base__io_buffer* buf) {
  return buf ? buf->data.len - buf->meta.wi : 0;
}

static inline uint8_t*  //
wuffs_base__io_buffer__writer_pointer(const wuffs_base__io_buffer* buf) {
  return buf ? (buf->data.ptr + buf->meta.wi) : NULL;
}

static inline uint64_t  //
wuffs_base__io_buffer__writer_position(const wuffs_base__io_buffer* buf) {
  return buf ? wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.wi) : 0;
}

static inline wuffs_base__slice_u8  //
wuffs_base__io_buffer__writer_slice(const wuffs_base__io_buffer* buf) {
  return buf ? wuffs_base__make_slice_u8(buf->data.ptr + buf->meta.wi,
                                         buf->data.len - buf->meta.wi)
             : wuffs_base__empty_slice_u8();
}

#ifdef __cplusplus

inline bool  //
wuffs_base__io_buffer::is_valid() const {
  return wuffs_base__io_buffer__is_valid(this);
}

inline void  //
wuffs_base__io_buffer::compact() {
  wuffs_base__io_buffer__compact(this);
}

inline uint64_t  //
wuffs_base__io_buffer::reader_io_position() const {
  return wuffs_base__io_buffer__reader_io_position(this);
}

inline size_t  //
wuffs_base__io_buffer::reader_length() const {
  return wuffs_base__io_buffer__reader_length(this);
}

inline uint8_t*  //
wuffs_base__io_buffer::reader_pointer() const {
  return wuffs_base__io_buffer__reader_pointer(this);
}

inline uint64_t  //
wuffs_base__io_buffer::reader_position() const {
  return wuffs_base__io_buffer__reader_position(this);
}

inline wuffs_base__slice_u8  //
wuffs_base__io_buffer::reader_slice() const {
  return wuffs_base__io_buffer__reader_slice(this);
}

inline uint64_t  //
wuffs_base__io_buffer::writer_io_position() const {
  return wuffs_base__io_buffer__writer_io_position(this);
}

inline size_t  //
wuffs_base__io_buffer::writer_length() const {
  return wuffs_base__io_buffer__writer_length(this);
}

inline uint8_t*  //
wuffs_base__io_buffer::writer_pointer() const {
  return wuffs_base__io_buffer__writer_pointer(this);
}

inline uint64_t  //
wuffs_base__io_buffer::writer_position() const {
  return wuffs_base__io_buffer__writer_position(this);
}

inline wuffs_base__slice_u8  //
wuffs_base__io_buffer::writer_slice() const {
  return wuffs_base__io_buffer__writer_slice(this);
}

#endif  // __cplusplus

// ---------------- Tokens

// wuffs_base__token is an element of a byte stream's tokenization.
//
// See https://github.com/google/wuffs/blob/main/doc/note/tokens.md
typedef struct wuffs_base__token__struct {
  uint64_t repr;

#ifdef __cplusplus
  inline int64_t value() const;
  inline int64_t value_extension() const;
  inline int64_t value_major() const;
  inline int64_t value_base_category() const;
  inline uint64_t value_minor() const;
  inline uint64_t value_base_detail() const;
  inline int64_t value_base_detail__sign_extended() const;
  inline bool continued() const;
  inline uint64_t length() const;
#endif  // __cplusplus

} wuffs_base__token;

static inline wuffs_base__token  //
wuffs_base__make_token(uint64_t repr) {
  wuffs_base__token ret;
  ret.repr = repr;
  return ret;
}

// --------

#define WUFFS_BASE__TOKEN__LENGTH__MAX_INCL 0xFFFF

#define WUFFS_BASE__TOKEN__VALUE__SHIFT 17
#define WUFFS_BASE__TOKEN__VALUE_EXTENSION__SHIFT 17
#define WUFFS_BASE__TOKEN__VALUE_MAJOR__SHIFT 42
#define WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT 17
#define WUFFS_BASE__TOKEN__VALUE_BASE_CATEGORY__SHIFT 38
#define WUFFS_BASE__TOKEN__VALUE_BASE_DETAIL__SHIFT 17
#define WUFFS_BASE__TOKEN__CONTINUED__SHIFT 16
#define WUFFS_BASE__TOKEN__LENGTH__SHIFT 0

#define WUFFS_BASE__TOKEN__VALUE_EXTENSION__NUM_BITS 46

// --------

#define WUFFS_BASE__TOKEN__VBC__FILLER 0
#define WUFFS_BASE__TOKEN__VBC__STRUCTURE 1
#define WUFFS_BASE__TOKEN__VBC__STRING 2
#define WUFFS_BASE__TOKEN__VBC__UNICODE_CODE_POINT 3
#define WUFFS_BASE__TOKEN__VBC__LITERAL 4
#define WUFFS_BASE__TOKEN__VBC__NUMBER 5
#define WUFFS_BASE__TOKEN__VBC__INLINE_INTEGER_SIGNED 6
#define WUFFS_BASE__TOKEN__VBC__INLINE_INTEGER_UNSIGNED 7

// --------

#define WUFFS_BASE__TOKEN__VBD__FILLER__PUNCTUATION 0x00001
#define WUFFS_BASE__TOKEN__VBD__FILLER__COMMENT_BLOCK 0x00002
#define WUFFS_BASE__TOKEN__VBD__FILLER__COMMENT_LINE 0x00004

// COMMENT_ANY is a bit-wise or of COMMENT_BLOCK AND COMMENT_LINE.
#define WUFFS_BASE__TOKEN__VBD__FILLER__COMMENT_ANY 0x00006

// --------

#define WUFFS_BASE__TOKEN__VBD__STRUCTURE__PUSH 0x00001
#define WUFFS_BASE__TOKEN__VBD__STRUCTURE__POP 0x00002
#define WUFFS_BASE__TOKEN__VBD__STRUCTURE__FROM_NONE 0x00010
#define WUFFS_BASE__TOKEN__VBD__STRUCTURE__FROM_LIST 0x00020
#define WUFFS_BASE__TOKEN__VBD__STRUCTURE__FROM_DICT 0x00040
#define WUFFS_BASE__TOKEN__VBD__STRUCTURE__TO_NONE 0x01000
#define WUFFS_BASE__TOKEN__VBD__STRUCTURE__TO_LIST 0x02000
#define WUFFS_BASE__TOKEN__VBD__STRUCTURE__TO_DICT 0x04000

// --------

// DEFINITELY_FOO means that the destination bytes (and also the source bytes,
// for 1_DST_1_SRC_COPY) are in the FOO format. Definitely means that the lack
// of the bit means "maybe FOO". It does not necessarily mean "not FOO".
//
// CHAIN_ETC means that decoding the entire token chain forms a UTF-8 or ASCII
// string, not just this current token. CHAIN_ETC_UTF_8 therefore distinguishes
// Unicode (UTF-8) strings from byte strings. MUST means that the the token
// producer (e.g. parser) must verify this. SHOULD means that the token
// consumer (e.g. renderer) should verify this.
//
// When a CHAIN_ETC_UTF_8 bit is set, the parser must ensure that non-ASCII
// code points (with multi-byte UTF-8 encodings) do not straddle token
// boundaries. Checking UTF-8 validity can inspect each token separately.
//
// The lack of any particular bit is conservative: it is valid for all-ASCII
// strings, in a single- or multi-token chain, to have none of these bits set.
#define WUFFS_BASE__TOKEN__VBD__STRING__DEFINITELY_UTF_8 0x00001
#define WUFFS_BASE__TOKEN__VBD__STRING__CHAIN_MUST_BE_UTF_8 0x00002
#define WUFFS_BASE__TOKEN__VBD__STRING__CHAIN_SHOULD_BE_UTF_8 0x00004
#define WUFFS_BASE__TOKEN__VBD__STRING__DEFINITELY_ASCII 0x00010
#define WUFFS_BASE__TOKEN__VBD__STRING__CHAIN_MUST_BE_ASCII 0x00020
#define WUFFS_BASE__TOKEN__VBD__STRING__CHAIN_SHOULD_BE_ASCII 0x00040

// CONVERT_D_DST_S_SRC means that multiples of S source bytes (possibly padded)
// produces multiples of D destination bytes. For example,
// CONVERT_1_DST_4_SRC_BACKSLASH_X means a source like "\\x23\\x67\\xAB", where
// 12 src bytes encode 3 dst bytes.
//
// Post-processing may further transform those D destination bytes (e.g. treat
// "\\xFF" as the Unicode code point U+00FF instead of the byte 0xFF), but that
// is out of scope of this VBD's semantics.
//
// When src is the empty string, multiple conversion algorithms are applicable
// (so these bits are not necessarily mutually exclusive), all producing the
// same empty dst string.
#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_0_DST_1_SRC_DROP 0x00100
#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_1_DST_1_SRC_COPY 0x00200
#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_1_DST_2_SRC_HEXADECIMAL 0x00400
#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_1_DST_4_SRC_BACKSLASH_X 0x00800
#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_3_DST_4_SRC_BASE_64_STD 0x01000
#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_3_DST_4_SRC_BASE_64_URL 0x02000
#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_4_DST_5_SRC_ASCII_85 0x04000
#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_5_DST_8_SRC_BASE_32_HEX 0x08000
#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_5_DST_8_SRC_BASE_32_STD 0x10000

// --------

#define WUFFS_BASE__TOKEN__VBD__LITERAL__UNDEFINED 0x00001
#define WUFFS_BASE__TOKEN__VBD__LITERAL__NULL 0x00002
#define WUFFS_BASE__TOKEN__VBD__LITERAL__FALSE 0x00004
#define WUFFS_BASE__TOKEN__VBD__LITERAL__TRUE 0x00008

// --------

// For a source string of "123" or "0x9A", it is valid for a tokenizer to
// return any combination of:
//  - WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_FLOATING_POINT.
//  - WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_INTEGER_SIGNED.
//  - WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_INTEGER_UNSIGNED.
//
// For a source string of "+123" or "-0x9A", only the first two are valid.
//
// For a source string of "123.", only the first one is valid.
#define WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_FLOATING_POINT 0x00001
#define WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_INTEGER_SIGNED 0x00002
#define WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_INTEGER_UNSIGNED 0x00004

#define WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_NEG_INF 0x00010
#define WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_POS_INF 0x00020
#define WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_NEG_NAN 0x00040
#define WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_POS_NAN 0x00080

// The number 300 might be represented as "\x01\x2C", "\x2C\x01\x00\x00" or
// "300", which are big-endian, little-endian or text. For binary formats, the
// token length (after adjusting for FORMAT_IGNORE_ETC) discriminates
// e.g. u16 little-endian vs u32 little-endian.
#define WUFFS_BASE__TOKEN__VBD__NUMBER__FORMAT_BINARY_BIG_ENDIAN 0x00100
#define WUFFS_BASE__TOKEN__VBD__NUMBER__FORMAT_BINARY_LITTLE_ENDIAN 0x00200
#define WUFFS_BASE__TOKEN__VBD__NUMBER__FORMAT_TEXT 0x00400

#define WUFFS_BASE__TOKEN__VBD__NUMBER__FORMAT_IGNORE_FIRST_BYTE 0x01000

// --------

// wuffs_base__token__value returns the token's high 46 bits, sign-extended. A
// negative value means an extended token, non-negative means a simple token.
static inline int64_t  //
wuffs_base__token__value(const wuffs_base__token* t) {
  return ((int64_t)(t->repr)) >> WUFFS_BASE__TOKEN__VALUE__SHIFT;
}

// wuffs_base__token__value_extension returns a negative value if the token was
// not an extended token.
static inline int64_t  //
wuffs_base__token__value_extension(const wuffs_base__token* t) {
  return (~(int64_t)(t->repr)) >> WUFFS_BASE__TOKEN__VALUE_EXTENSION__SHIFT;
}

// wuffs_base__token__value_major returns a negative value if the token was not
// a simple token.
static inline int64_t  //
wuffs_base__token__value_major(const wuffs_base__token* t) {
  return ((int64_t)(t->repr)) >> WUFFS_BASE__TOKEN__VALUE_MAJOR__SHIFT;
}

// wuffs_base__token__value_base_category returns a negative value if the token
// was not a simple token.
static inline int64_t  //
wuffs_base__token__value_base_category(const wuffs_base__token* t) {
  return ((int64_t)(t->repr)) >> WUFFS_BASE__TOKEN__VALUE_BASE_CATEGORY__SHIFT;
}

static inline uint64_t  //
wuffs_base__token__value_minor(const wuffs_base__token* t) {
  return (t->repr >> WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) & 0x1FFFFFF;
}

static inline uint64_t  //
wuffs_base__token__value_base_detail(const wuffs_base__token* t) {
  return (t->repr >> WUFFS_BASE__TOKEN__VALUE_BASE_DETAIL__SHIFT) & 0x1FFFFF;
}

static inline int64_t  //
wuffs_base__token__value_base_detail__sign_extended(
    const wuffs_base__token* t) {
  // The VBD is 21 bits in the middle of t->repr. Left shift the high (64 - 21
  // - ETC__SHIFT) bits off, then right shift (sign-extending) back down.
  uint64_t u = t->repr << (43 - WUFFS_BASE__TOKEN__VALUE_BASE_DETAIL__SHIFT);
  return ((int64_t)u) >> 43;
}

static inline bool  //
wuffs_base__token__continued(const wuffs_base__token* t) {
  return t->repr & 0x10000;
}

static inline uint64_t  //
wuffs_base__token__length(const wuffs_base__token* t) {
  return (t->repr >> WUFFS_BASE__TOKEN__LENGTH__SHIFT) & 0xFFFF;
}

#ifdef __cplusplus

inline int64_t  //
wuffs_base__token::value() const {
  return wuffs_base__token__value(this);
}

inline int64_t  //
wuffs_base__token::value_extension() const {
  return wuffs_base__token__value_extension(this);
}

inline int64_t  //
wuffs_base__token::value_major() const {
  return wuffs_base__token__value_major(this);
}

inline int64_t  //
wuffs_base__token::value_base_category() const {
  return wuffs_base__token__value_base_category(this);
}

inline uint64_t  //
wuffs_base__token::value_minor() const {
  return wuffs_base__token__value_minor(this);
}

inline uint64_t  //
wuffs_base__token::value_base_detail() const {
  return wuffs_base__token__value_base_detail(this);
}

inline int64_t  //
wuffs_base__token::value_base_detail__sign_extended() const {
  return wuffs_base__token__value_base_detail__sign_extended(this);
}

inline bool  //
wuffs_base__token::continued() const {
  return wuffs_base__token__continued(this);
}

inline uint64_t  //
wuffs_base__token::length() const {
  return wuffs_base__token__length(this);
}

#endif  // __cplusplus

// --------

typedef WUFFS_BASE__SLICE(wuffs_base__token) wuffs_base__slice_token;

static inline wuffs_base__slice_token  //
wuffs_base__make_slice_token(wuffs_base__token* ptr, size_t len) {
  wuffs_base__slice_token ret;
  ret.ptr = ptr;
  ret.len = len;
  return ret;
}

static inline wuffs_base__slice_token  //
wuffs_base__empty_slice_token() {
  wuffs_base__slice_token ret;
  ret.ptr = NULL;
  ret.len = 0;
  return ret;
}

// --------

// wuffs_base__token_buffer_meta is the metadata for a
// wuffs_base__token_buffer's data.
typedef struct wuffs_base__token_buffer_meta__struct {
  size_t wi;     // Write index. Invariant: wi <= len.
  size_t ri;     // Read  index. Invariant: ri <= wi.
  uint64_t pos;  // Position of the buffer start relative to the stream start.
  bool closed;   // No further writes are expected.
} wuffs_base__token_buffer_meta;

// wuffs_base__token_buffer is a 1-dimensional buffer (a pointer and length)
// plus additional metadata.
//
// A value with all fields zero is a valid, empty buffer.
typedef struct wuffs_base__token_buffer__struct {
  wuffs_base__slice_token data;
  wuffs_base__token_buffer_meta meta;

#ifdef __cplusplus
  inline bool is_valid() const;
  inline void compact();
  inline uint64_t reader_length() const;
  inline wuffs_base__token* reader_pointer() const;
  inline wuffs_base__slice_token reader_slice() const;
  inline uint64_t reader_token_position() const;
  inline uint64_t writer_length() const;
  inline uint64_t writer_token_position() const;
  inline wuffs_base__token* writer_pointer() const;
  inline wuffs_base__slice_token writer_slice() const;
#endif  // __cplusplus

} wuffs_base__token_buffer;

static inline wuffs_base__token_buffer  //
wuffs_base__make_token_buffer(wuffs_base__slice_token data,
                              wuffs_base__token_buffer_meta meta) {
  wuffs_base__token_buffer ret;
  ret.data = data;
  ret.meta = meta;
  return ret;
}

static inline wuffs_base__token_buffer_meta  //
wuffs_base__make_token_buffer_meta(size_t wi,
                                   size_t ri,
                                   uint64_t pos,
                                   bool closed) {
  wuffs_base__token_buffer_meta ret;
  ret.wi = wi;
  ret.ri = ri;
  ret.pos = pos;
  ret.closed = closed;
  return ret;
}

static inline wuffs_base__token_buffer  //
wuffs_base__slice_token__reader(wuffs_base__slice_token s, bool closed) {
  wuffs_base__token_buffer ret;
  ret.data.ptr = s.ptr;
  ret.data.len = s.len;
  ret.meta.wi = s.len;
  ret.meta.ri = 0;
  ret.meta.pos = 0;
  ret.meta.closed = closed;
  return ret;
}

static inline wuffs_base__token_buffer  //
wuffs_base__slice_token__writer(wuffs_base__slice_token s) {
  wuffs_base__token_buffer ret;
  ret.data.ptr = s.ptr;
  ret.data.len = s.len;
  ret.meta.wi = 0;
  ret.meta.ri = 0;
  ret.meta.pos = 0;
  ret.meta.closed = false;
  return ret;
}

static inline wuffs_base__token_buffer  //
wuffs_base__empty_token_buffer() {
  wuffs_base__token_buffer ret;
  ret.data.ptr = NULL;
  ret.data.len = 0;
  ret.meta.wi = 0;
  ret.meta.ri = 0;
  ret.meta.pos = 0;
  ret.meta.closed = false;
  return ret;
}

static inline wuffs_base__token_buffer_meta  //
wuffs_base__empty_token_buffer_meta() {
  wuffs_base__token_buffer_meta ret;
  ret.wi = 0;
  ret.ri = 0;
  ret.pos = 0;
  ret.closed = false;
  return ret;
}

static inline bool  //
wuffs_base__token_buffer__is_valid(const wuffs_base__token_buffer* buf) {
  if (buf) {
    if (buf->data.ptr) {
      return (buf->meta.ri <= buf->meta.wi) && (buf->meta.wi <= buf->data.len);
    } else {
      return (buf->meta.ri == 0) && (buf->meta.wi == 0) && (buf->data.len == 0);
    }
  }
  return false;
}

// wuffs_base__token_buffer__compact moves any written but unread tokens to the
// start of the buffer.
static inline void  //
wuffs_base__token_buffer__compact(wuffs_base__token_buffer* buf) {
  if (!buf || (buf->meta.ri == 0)) {
    return;
  }
  buf->meta.pos = wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.ri);
  size_t n = buf->meta.wi - buf->meta.ri;
  if (n != 0) {
    memmove(buf->data.ptr, buf->data.ptr + buf->meta.ri,
            n * sizeof(wuffs_base__token));
  }
  buf->meta.wi = n;
  buf->meta.ri = 0;
}

static inline uint64_t  //
wuffs_base__token_buffer__reader_length(const wuffs_base__token_buffer* buf) {
  return buf ? buf->meta.wi - buf->meta.ri : 0;
}

static inline wuffs_base__token*  //
wuffs_base__token_buffer__reader_pointer(const wuffs_base__token_buffer* buf) {
  return buf ? (buf->data.ptr + buf->meta.ri) : NULL;
}

static inline wuffs_base__slice_token  //
wuffs_base__token_buffer__reader_slice(const wuffs_base__token_buffer* buf) {
  return buf ? wuffs_base__make_slice_token(buf->data.ptr + buf->meta.ri,
                                            buf->meta.wi - buf->meta.ri)
             : wuffs_base__empty_slice_token();
}

static inline uint64_t  //
wuffs_base__token_buffer__reader_token_position(
    const wuffs_base__token_buffer* buf) {
  return buf ? wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.ri) : 0;
}

static inline uint64_t  //
wuffs_base__token_buffer__writer_length(const wuffs_base__token_buffer* buf) {
  return buf ? buf->data.len - buf->meta.wi : 0;
}

static inline wuffs_base__token*  //
wuffs_base__token_buffer__writer_pointer(const wuffs_base__token_buffer* buf) {
  return buf ? (buf->data.ptr + buf->meta.wi) : NULL;
}

static inline wuffs_base__slice_token  //
wuffs_base__token_buffer__writer_slice(const wuffs_base__token_buffer* buf) {
  return buf ? wuffs_base__make_slice_token(buf->data.ptr + buf->meta.wi,
                                            buf->data.len - buf->meta.wi)
             : wuffs_base__empty_slice_token();
}

static inline uint64_t  //
wuffs_base__token_buffer__writer_token_position(
    const wuffs_base__token_buffer* buf) {
  return buf ? wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.wi) : 0;
}

#ifdef __cplusplus

inline bool  //
wuffs_base__token_buffer::is_valid() const {
  return wuffs_base__token_buffer__is_valid(this);
}

inline void  //
wuffs_base__token_buffer::compact() {
  wuffs_base__token_buffer__compact(this);
}

inline uint64_t  //
wuffs_base__token_buffer::reader_length() const {
  return wuffs_base__token_buffer__reader_length(this);
}

inline wuffs_base__token*  //
wuffs_base__token_buffer::reader_pointer() const {
  return wuffs_base__token_buffer__reader_pointer(this);
}

inline wuffs_base__slice_token  //
wuffs_base__token_buffer::reader_slice() const {
  return wuffs_base__token_buffer__reader_slice(this);
}

inline uint64_t  //
wuffs_base__token_buffer::reader_token_position() const {
  return wuffs_base__token_buffer__reader_token_position(this);
}

inline uint64_t  //
wuffs_base__token_buffer::writer_length() const {
  return wuffs_base__token_buffer__writer_length(this);
}

inline wuffs_base__token*  //
wuffs_base__token_buffer::writer_pointer() const {
  return wuffs_base__token_buffer__writer_pointer(this);
}

inline wuffs_base__slice_token  //
wuffs_base__token_buffer::writer_slice() const {
  return wuffs_base__token_buffer__writer_slice(this);
}

inline uint64_t  //
wuffs_base__token_buffer::writer_token_position() const {
  return wuffs_base__token_buffer__writer_token_position(this);
}

#endif  // __cplusplus

// ---------------- Memory Allocation

// The memory allocation related functions in this section aren't used by Wuffs
// per se, but they may be helpful to the code that uses Wuffs.

// wuffs_base__malloc_slice_uxx wraps calling a malloc-like function, except
// that it takes a uint64_t number of elements instead of a size_t size in
// bytes, and it returns a slice (a pointer and a length) instead of just a
// pointer.
//
// You can pass the C stdlib's malloc as the malloc_func.
//
// It returns an empty slice (containing a NULL ptr field) if (num_uxx *
// sizeof(uintxx_t)) would overflow SIZE_MAX.

static inline wuffs_base__slice_u8  //
wuffs_base__malloc_slice_u8(void* (*malloc_func)(size_t), uint64_t num_u8) {
  if (malloc_func && (num_u8 <= (SIZE_MAX / sizeof(uint8_t)))) {
    void* p = (*malloc_func)((size_t)(num_u8 * sizeof(uint8_t)));
    if (p) {
      return wuffs_base__make_slice_u8((uint8_t*)(p), (size_t)num_u8);
    }
  }
  return wuffs_base__make_slice_u8(NULL, 0);
}

static inline wuffs_base__slice_u16  //
wuffs_base__malloc_slice_u16(void* (*malloc_func)(size_t), uint64_t num_u16) {
  if (malloc_func && (num_u16 <= (SIZE_MAX / sizeof(uint16_t)))) {
    void* p = (*malloc_func)((size_t)(num_u16 * sizeof(uint16_t)));
    if (p) {
      return wuffs_base__make_slice_u16((uint16_t*)(p), (size_t)num_u16);
    }
  }
  return wuffs_base__make_slice_u16(NULL, 0);
}

static inline wuffs_base__slice_u32  //
wuffs_base__malloc_slice_u32(void* (*malloc_func)(size_t), uint64_t num_u32) {
  if (malloc_func && (num_u32 <= (SIZE_MAX / sizeof(uint32_t)))) {
    void* p = (*malloc_func)((size_t)(num_u32 * sizeof(uint32_t)));
    if (p) {
      return wuffs_base__make_slice_u32((uint32_t*)(p), (size_t)num_u32);
    }
  }
  return wuffs_base__make_slice_u32(NULL, 0);
}

static inline wuffs_base__slice_u64  //
wuffs_base__malloc_slice_u64(void* (*malloc_func)(size_t), uint64_t num_u64) {
  if (malloc_func && (num_u64 <= (SIZE_MAX / sizeof(uint64_t)))) {
    void* p = (*malloc_func)((size_t)(num_u64 * sizeof(uint64_t)));
    if (p) {
      return wuffs_base__make_slice_u64((uint64_t*)(p), (size_t)num_u64);
    }
  }
  return wuffs_base__make_slice_u64(NULL, 0);
}

// ---------------- Images

// wuffs_base__color_u32_argb_premul is an 8 bit per channel premultiplied
// Alpha, Red, Green, Blue color, as a uint32_t value. Its value is always
// 0xAARRGGBB (Alpha most significant, Blue least), regardless of endianness.
typedef uint32_t wuffs_base__color_u32_argb_premul;

static inline uint16_t  //
wuffs_base__color_u32_argb_premul__as__color_u16_rgb_565(
    wuffs_base__color_u32_argb_premul c) {
  uint32_t r5 = 0xF800 & (c >> 8);
  uint32_t g6 = 0x07E0 & (c >> 5);
  uint32_t b5 = 0x001F & (c >> 3);
  return (uint16_t)(r5 | g6 | b5);
}

static inline wuffs_base__color_u32_argb_premul  //
wuffs_base__color_u16_rgb_565__as__color_u32_argb_premul(uint16_t rgb_565) {
  uint32_t b5 = 0x1F & (rgb_565 >> 0);
  uint32_t b = (b5 << 3) | (b5 >> 2);
  uint32_t g6 = 0x3F & (rgb_565 >> 5);
  uint32_t g = (g6 << 2) | (g6 >> 4);
  uint32_t r5 = 0x1F & (rgb_565 >> 11);
  uint32_t r = (r5 << 3) | (r5 >> 2);
  return 0xFF000000 | (r << 16) | (g << 8) | (b << 0);
}

static inline uint8_t  //
wuffs_base__color_u32_argb_premul__as__color_u8_gray(
    wuffs_base__color_u32_argb_premul c) {
  // Work in 16-bit color.
  uint32_t cr = 0x101 * (0xFF & (c >> 16));
  uint32_t cg = 0x101 * (0xFF & (c >> 8));
  uint32_t cb = 0x101 * (0xFF & (c >> 0));

  // These coefficients (the fractions 0.299, 0.587 and 0.114) are the same
  // as those given by the JFIF specification.
  //
  // Note that 19595 + 38470 + 7471 equals 65536, also known as (1 << 16). We
  // shift by 24, not just by 16, because the return value is 8-bit color, not
  // 16-bit color.
  uint32_t weighted_average = (19595 * cr) + (38470 * cg) + (7471 * cb) + 32768;
  return (uint8_t)(weighted_average >> 24);
}

static inline uint16_t  //
wuffs_base__color_u32_argb_premul__as__color_u16_gray(
    wuffs_base__color_u32_argb_premul c) {
  // Work in 16-bit color.
  uint32_t cr = 0x101 * (0xFF & (c >> 16));
  uint32_t cg = 0x101 * (0xFF & (c >> 8));
  uint32_t cb = 0x101 * (0xFF & (c >> 0));

  // These coefficients (the fractions 0.299, 0.587 and 0.114) are the same
  // as those given by the JFIF specification.
  //
  // Note that 19595 + 38470 + 7471 equals 65536, also known as (1 << 16).
  uint32_t weighted_average = (19595 * cr) + (38470 * cg) + (7471 * cb) + 32768;
  return (uint16_t)(weighted_average >> 16);
}

// wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul converts
// from non-premultiplied alpha to premultiplied alpha.
static inline wuffs_base__color_u32_argb_premul  //
wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(
    uint32_t argb_nonpremul) {
  // Multiplying by 0x101 (twice, once for alpha and once for color) converts
  // from 8-bit to 16-bit color. Shifting right by 8 undoes that.
  //
  // Working in the higher bit depth can produce slightly different (and
  // arguably slightly more accurate) results. For example, given 8-bit blue
  // and alpha of 0x80 and 0x81:
  //
  //  - ((0x80   * 0x81  ) / 0xFF  )      = 0x40        = 0x40
  //  - ((0x8080 * 0x8181) / 0xFFFF) >> 8 = 0x4101 >> 8 = 0x41
  uint32_t a = 0xFF & (argb_nonpremul >> 24);
  uint32_t a16 = a * (0x101 * 0x101);

  uint32_t r = 0xFF & (argb_nonpremul >> 16);
  r = ((r * a16) / 0xFFFF) >> 8;
  uint32_t g = 0xFF & (argb_nonpremul >> 8);
  g = ((g * a16) / 0xFFFF) >> 8;
  uint32_t b = 0xFF & (argb_nonpremul >> 0);
  b = ((b * a16) / 0xFFFF) >> 8;

  return (a << 24) | (r << 16) | (g << 8) | (b << 0);
}

// wuffs_base__color_u32_argb_premul__as__color_u32_argb_nonpremul converts
// from premultiplied alpha to non-premultiplied alpha.
static inline uint32_t  //
wuffs_base__color_u32_argb_premul__as__color_u32_argb_nonpremul(
    wuffs_base__color_u32_argb_premul c) {
  uint32_t a = 0xFF & (c >> 24);
  if (a == 0xFF) {
    return c;
  } else if (a == 0) {
    return 0;
  }
  uint32_t a16 = a * 0x101;

  uint32_t r = 0xFF & (c >> 16);
  r = ((r * (0x101 * 0xFFFF)) / a16) >> 8;
  uint32_t g = 0xFF & (c >> 8);
  g = ((g * (0x101 * 0xFFFF)) / a16) >> 8;
  uint32_t b = 0xFF & (c >> 0);
  b = ((b * (0x101 * 0xFFFF)) / a16) >> 8;

  return (a << 24) | (r << 16) | (g << 8) | (b << 0);
}

// wuffs_base__color_u64_argb_nonpremul__as__color_u32_argb_premul converts
// from 4x16LE non-premultiplied alpha to 4x8 premultiplied alpha.
static inline wuffs_base__color_u32_argb_premul  //
wuffs_base__color_u64_argb_nonpremul__as__color_u32_argb_premul(
    uint64_t argb_nonpremul) {
  uint32_t a16 = ((uint32_t)(0xFFFF & (argb_nonpremul >> 48)));

  uint32_t r16 = ((uint32_t)(0xFFFF & (argb_nonpremul >> 32)));
  r16 = (r16 * a16) / 0xFFFF;
  uint32_t g16 = ((uint32_t)(0xFFFF & (argb_nonpremul >> 16)));
  g16 = (g16 * a16) / 0xFFFF;
  uint32_t b16 = ((uint32_t)(0xFFFF & (argb_nonpremul >> 0)));
  b16 = (b16 * a16) / 0xFFFF;

  return ((a16 >> 8) << 24) | ((r16 >> 8) << 16) | ((g16 >> 8) << 8) |
         ((b16 >> 8) << 0);
}

// wuffs_base__color_u32_argb_premul__as__color_u64_argb_nonpremul converts
// from 4x8 premultiplied alpha to 4x16LE non-premultiplied alpha.
static inline uint64_t  //
wuffs_base__color_u32_argb_premul__as__color_u64_argb_nonpremul(
    wuffs_base__color_u32_argb_premul c) {
  uint32_t a = 0xFF & (c >> 24);
  if (a == 0xFF) {
    uint64_t r16 = 0x101 * (0xFF & (c >> 16));
    uint64_t g16 = 0x101 * (0xFF & (c >> 8));
    uint64_t b16 = 0x101 * (0xFF & (c >> 0));
    return 0xFFFF000000000000u | (r16 << 32) | (g16 << 16) | (b16 << 0);
  } else if (a == 0) {
    return 0;
  }
  uint64_t a16 = a * 0x101;

  uint64_t r = 0xFF & (c >> 16);
  uint64_t r16 = (r * (0x101 * 0xFFFF)) / a16;
  uint64_t g = 0xFF & (c >> 8);
  uint64_t g16 = (g * (0x101 * 0xFFFF)) / a16;
  uint64_t b = 0xFF & (c >> 0);
  uint64_t b16 = (b * (0x101 * 0xFFFF)) / a16;

  return (a16 << 48) | (r16 << 32) | (g16 << 16) | (b16 << 0);
}

static inline uint64_t  //
wuffs_base__color_u32__as__color_u64(uint32_t c) {
  uint64_t a16 = 0x101 * (0xFF & (c >> 24));
  uint64_t r16 = 0x101 * (0xFF & (c >> 16));
  uint64_t g16 = 0x101 * (0xFF & (c >> 8));
  uint64_t b16 = 0x101 * (0xFF & (c >> 0));
  return (a16 << 48) | (r16 << 32) | (g16 << 16) | (b16 << 0);
}

static inline uint32_t  //
wuffs_base__color_u64__as__color_u32(uint64_t c) {
  uint32_t a = ((uint32_t)(0xFF & (c >> 56)));
  uint32_t r = ((uint32_t)(0xFF & (c >> 40)));
  uint32_t g = ((uint32_t)(0xFF & (c >> 24)));
  uint32_t b = ((uint32_t)(0xFF & (c >> 8)));
  return (a << 24) | (r << 16) | (g << 8) | (b << 0);
}

// --------

typedef uint8_t wuffs_base__pixel_blend;

// wuffs_base__pixel_blend encodes how to blend source and destination pixels,
// accounting for transparency. It encompasses the Porter-Duff compositing
// operators as well as the other blending modes defined by PDF.
//
// TODO: implement the other modes.
#define WUFFS_BASE__PIXEL_BLEND__SRC ((wuffs_base__pixel_blend)0)
#define WUFFS_BASE__PIXEL_BLEND__SRC_OVER ((wuffs_base__pixel_blend)1)

// --------

// wuffs_base__pixel_alpha_transparency is a pixel format's alpha channel
// model. It is a property of the pixel format in general, not of a specific
// pixel. An RGBA pixel format (with alpha) can still have fully opaque pixels.
typedef uint32_t wuffs_base__pixel_alpha_transparency;

#define WUFFS_BASE__PIXEL_ALPHA_TRANSPARENCY__OPAQUE 0
#define WUFFS_BASE__PIXEL_ALPHA_TRANSPARENCY__NONPREMULTIPLIED_ALPHA 1
#define WUFFS_BASE__PIXEL_ALPHA_TRANSPARENCY__PREMULTIPLIED_ALPHA 2
#define WUFFS_BASE__PIXEL_ALPHA_TRANSPARENCY__BINARY_ALPHA 3

// Deprecated: use WUFFS_BASE__PIXEL_ALPHA_TRANSPARENCY__NONPREMULTIPLIED_ALPHA
// instead.
#define WUFFS_BASE__PIXEL_ALPHA_TRANSPARENCY__NON_PREMULTIPLIED_ALPHA 1

// --------

#define WUFFS_BASE__PIXEL_FORMAT__NUM_PLANES_MAX 4

#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__INDEX_PLANE 0
#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__COLOR_PLANE 3

// wuffs_base__pixel_format encodes the format of the bytes that constitute an
// image frame's pixel data.
//
// See https://github.com/google/wuffs/blob/main/doc/note/pixel-formats.md
//
// Do not manipulate its bits directly; they are private implementation
// details. Use methods such as wuffs_base__pixel_format__num_planes instead.
typedef struct wuffs_base__pixel_format__struct {
  uint32_t repr;

#ifdef __cplusplus
  inline bool is_valid() const;
  inline uint32_t bits_per_pixel() const;
  inline bool is_direct() const;
  inline bool is_indexed() const;
  inline bool is_interleaved() const;
  inline bool is_planar() const;
  inline uint32_t num_planes() const;
  inline wuffs_base__pixel_alpha_transparency transparency() const;
#endif  // __cplusplus

} wuffs_base__pixel_format;

static inline wuffs_base__pixel_format  //
wuffs_base__make_pixel_format(uint32_t repr) {
  wuffs_base__pixel_format f;
  f.repr = repr;
  return f;
}

// Common 8-bit-depth pixel formats. This list is not exhaustive; not all valid
// wuffs_base__pixel_format values are present.

#define WUFFS_BASE__PIXEL_FORMAT__INVALID 0x00000000

#define WUFFS_BASE__PIXEL_FORMAT__A 0x02000008

#define WUFFS_BASE__PIXEL_FORMAT__Y 0x20000008
#define WUFFS_BASE__PIXEL_FORMAT__Y_16LE 0x2000000B
#define WUFFS_BASE__PIXEL_FORMAT__Y_16BE 0x2010000B
#define WUFFS_BASE__PIXEL_FORMAT__YA_NONPREMUL 0x21000008
#define WUFFS_BASE__PIXEL_FORMAT__YA_PREMUL 0x22000008

#define WUFFS_BASE__PIXEL_FORMAT__YCBCR 0x40020888
#define WUFFS_BASE__PIXEL_FORMAT__YCBCRA_NONPREMUL 0x41038888
#define WUFFS_BASE__PIXEL_FORMAT__YCBCRK 0x50038888

#define WUFFS_BASE__PIXEL_FORMAT__YCOCG 0x60020888
#define WUFFS_BASE__PIXEL_FORMAT__YCOCGA_NONPREMUL 0x61038888
#define WUFFS_BASE__PIXEL_FORMAT__YCOCGK 0x70038888

#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL 0x81040008
#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_PREMUL 0x82040008
#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY 0x83040008

#define WUFFS_BASE__PIXEL_FORMAT__BGR_565 0x80000565
#define WUFFS_BASE__PIXEL_FORMAT__BGR 0x80000888
#define WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL 0x81008888
#define WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE 0x8100BBBB
#define WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL 0x82008888
#define WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL_4X16LE 0x8200BBBB
#define WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY 0x83008888
#define WUFFS_BASE__PIXEL_FORMAT__BGRX 0x90008888

#define WUFFS_BASE__PIXEL_FORMAT__RGB 0xA0000888
#define WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL 0xA1008888
#define WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL_4X16LE 0xA100BBBB
#define WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL 0xA2008888
#define WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL_4X16LE 0xA200BBBB
#define WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY 0xA3008888
#define WUFFS_BASE__PIXEL_FORMAT__RGBX 0xB0008888

#define WUFFS_BASE__PIXEL_FORMAT__CMY 0xC0020888
#define WUFFS_BASE__PIXEL_FORMAT__CMYK 0xD0038888

extern const uint32_t wuffs_base__pixel_format__bits_per_channel[16];

static inline bool  //
wuffs_base__pixel_format__is_valid(const wuffs_base__pixel_format* f) {
  return f->repr != 0;
}

// wuffs_base__pixel_format__bits_per_pixel returns the number of bits per
// pixel for interleaved pixel formats, and returns 0 for planar pixel formats.
static inline uint32_t  //
wuffs_base__pixel_format__bits_per_pixel(const wuffs_base__pixel_format* f) {
  if (((f->repr >> 16) & 0x03) != 0) {
    return 0;
  }
  return wuffs_base__pixel_format__bits_per_channel[0x0F & (f->repr >> 0)] +
         wuffs_base__pixel_format__bits_per_channel[0x0F & (f->repr >> 4)] +
         wuffs_base__pixel_format__bits_per_channel[0x0F & (f->repr >> 8)] +
         wuffs_base__pixel_format__bits_per_channel[0x0F & (f->repr >> 12)];
}

static inline bool  //
wuffs_base__pixel_format__is_direct(const wuffs_base__pixel_format* f) {
  return ((f->repr >> 18) & 0x01) == 0;
}

static inline bool  //
wuffs_base__pixel_format__is_indexed(const wuffs_base__pixel_format* f) {
  return ((f->repr >> 18) & 0x01) != 0;
}

static inline bool  //
wuffs_base__pixel_format__is_interleaved(const wuffs_base__pixel_format* f) {
  return ((f->repr >> 16) & 0x03) == 0;
}

static inline bool  //
wuffs_base__pixel_format__is_planar(const wuffs_base__pixel_format* f) {
  return ((f->repr >> 16) & 0x03) != 0;
}

static inline uint32_t  //
wuffs_base__pixel_format__num_planes(const wuffs_base__pixel_format* f) {
  return ((f->repr >> 16) & 0x03) + 1;
}

static inline wuffs_base__pixel_alpha_transparency  //
wuffs_base__pixel_format__transparency(const wuffs_base__pixel_format* f) {
  return (wuffs_base__pixel_alpha_transparency)((f->repr >> 24) & 0x03);
}

#ifdef __cplusplus

inline bool  //
wuffs_base__pixel_format::is_valid() const {
  return wuffs_base__pixel_format__is_valid(this);
}

inline uint32_t  //
wuffs_base__pixel_format::bits_per_pixel() const {
  return wuffs_base__pixel_format__bits_per_pixel(this);
}

inline bool  //
wuffs_base__pixel_format::is_direct() const {
  return wuffs_base__pixel_format__is_direct(this);
}

inline bool  //
wuffs_base__pixel_format::is_indexed() const {
  return wuffs_base__pixel_format__is_indexed(this);
}

inline bool  //
wuffs_base__pixel_format::is_interleaved() const {
  return wuffs_base__pixel_format__is_interleaved(this);
}

inline bool  //
wuffs_base__pixel_format::is_planar() const {
  return wuffs_base__pixel_format__is_planar(this);
}

inline uint32_t  //
wuffs_base__pixel_format::num_planes() const {
  return wuffs_base__pixel_format__num_planes(this);
}

inline wuffs_base__pixel_alpha_transparency  //
wuffs_base__pixel_format::transparency() const {
  return wuffs_base__pixel_format__transparency(this);
}

#endif  // __cplusplus

// --------

// wuffs_base__pixel_subsampling encodes whether sample values cover one pixel
// or cover multiple pixels.
//
// See https://github.com/google/wuffs/blob/main/doc/note/pixel-subsampling.md
//
// Do not manipulate its bits directly; they are private implementation
// details. Use methods such as wuffs_base__pixel_subsampling__bias_x instead.
typedef struct wuffs_base__pixel_subsampling__struct {
  uint32_t repr;

#ifdef __cplusplus
  inline uint32_t bias_x(uint32_t plane) const;
  inline uint32_t denominator_x(uint32_t plane) const;
  inline uint32_t bias_y(uint32_t plane) const;
  inline uint32_t denominator_y(uint32_t plane) const;
#endif  // __cplusplus

} wuffs_base__pixel_subsampling;

static inline wuffs_base__pixel_subsampling  //
wuffs_base__make_pixel_subsampling(uint32_t repr) {
  wuffs_base__pixel_subsampling s;
  s.repr = repr;
  return s;
}

#define WUFFS_BASE__PIXEL_SUBSAMPLING__NONE 0x00000000

#define WUFFS_BASE__PIXEL_SUBSAMPLING__444 0x000000
#define WUFFS_BASE__PIXEL_SUBSAMPLING__440 0x010100
#define WUFFS_BASE__PIXEL_SUBSAMPLING__422 0x101000
#define WUFFS_BASE__PIXEL_SUBSAMPLING__420 0x111100
#define WUFFS_BASE__PIXEL_SUBSAMPLING__411 0x303000
#define WUFFS_BASE__PIXEL_SUBSAMPLING__410 0x313100

static inline uint32_t  //
wuffs_base__pixel_subsampling__bias_x(const wuffs_base__pixel_subsampling* s,
                                      uint32_t plane) {
  uint32_t shift = ((plane & 0x03) * 8) + 6;
  return (s->repr >> shift) & 0x03;
}

static inline uint32_t  //
wuffs_base__pixel_subsampling__denominator_x(
    const wuffs_base__pixel_subsampling* s,
    uint32_t plane) {
  uint32_t shift = ((plane & 0x03) * 8) + 4;
  return ((s->repr >> shift) & 0x03) + 1;
}

static inline uint32_t  //
wuffs_base__pixel_subsampling__bias_y(const wuffs_base__pixel_subsampling* s,
                                      uint32_t plane) {
  uint32_t shift = ((plane & 0x03) * 8) + 2;
  return (s->repr >> shift) & 0x03;
}

static inline uint32_t  //
wuffs_base__pixel_subsampling__denominator_y(
    const wuffs_base__pixel_subsampling* s,
    uint32_t plane) {
  uint32_t shift = ((plane & 0x03) * 8) + 0;
  return ((s->repr >> shift) & 0x03) + 1;
}

#ifdef __cplusplus

inline uint32_t  //
wuffs_base__pixel_subsampling::bias_x(uint32_t plane) const {
  return wuffs_base__pixel_subsampling__bias_x(this, plane);
}

inline uint32_t  //
wuffs_base__pixel_subsampling::denominator_x(uint32_t plane) const {
  return wuffs_base__pixel_subsampling__denominator_x(this, plane);
}

inline uint32_t  //
wuffs_base__pixel_subsampling::bias_y(uint32_t plane) const {
  return wuffs_base__pixel_subsampling__bias_y(this, plane);
}

inline uint32_t  //
wuffs_base__pixel_subsampling::denominator_y(uint32_t plane) const {
  return wuffs_base__pixel_subsampling__denominator_y(this, plane);
}

#endif  // __cplusplus

// --------

typedef struct wuffs_base__pixel_config__struct {
  // Do not access the private_impl's fields directly. There is no API/ABI
  // compatibility or safety guarantee if you do so.
  struct {
    wuffs_base__pixel_format pixfmt;
    wuffs_base__pixel_subsampling pixsub;
    uint32_t width;
    uint32_t height;
  } private_impl;

#ifdef __cplusplus
  inline void set(uint32_t pixfmt_repr,
                  uint32_t pixsub_repr,
                  uint32_t width,
                  uint32_t height);
  inline void invalidate();
  inline bool is_valid() const;
  inline wuffs_base__pixel_format pixel_format() const;
  inline wuffs_base__pixel_subsampling pixel_subsampling() const;
  inline wuffs_base__rect_ie_u32 bounds() const;
  inline uint32_t width() const;
  inline uint32_t height() const;
  inline uint64_t pixbuf_len() const;
#endif  // __cplusplus

} wuffs_base__pixel_config;

static inline wuffs_base__pixel_config  //
wuffs_base__null_pixel_config() {
  wuffs_base__pixel_config ret;
  ret.private_impl.pixfmt.repr = 0;
  ret.private_impl.pixsub.repr = 0;
  ret.private_impl.width = 0;
  ret.private_impl.height = 0;
  return ret;
}

// TODO: Should this function return bool? An error type?
static inline void  //
wuffs_base__pixel_config__set(wuffs_base__pixel_config* c,
                              uint32_t pixfmt_repr,
                              uint32_t pixsub_repr,
                              uint32_t width,
                              uint32_t height) {
  if (!c) {
    return;
  }
  if (pixfmt_repr) {
    uint64_t wh = ((uint64_t)width) * ((uint64_t)height);
    // TODO: handle things other than 1 byte per pixel.
    if (wh <= ((uint64_t)SIZE_MAX)) {
      c->private_impl.pixfmt.repr = pixfmt_repr;
      c->private_impl.pixsub.repr = pixsub_repr;
      c->private_impl.width = width;
      c->private_impl.height = height;
      return;
    }
  }

  c->private_impl.pixfmt.repr = 0;
  c->private_impl.pixsub.repr = 0;
  c->private_impl.width = 0;
  c->private_impl.height = 0;
}

static inline void  //
wuffs_base__pixel_config__invalidate(wuffs_base__pixel_config* c) {
  if (c) {
    c->private_impl.pixfmt.repr = 0;
    c->private_impl.pixsub.repr = 0;
    c->private_impl.width = 0;
    c->private_impl.height = 0;
  }
}

static inline bool  //
wuffs_base__pixel_config__is_valid(const wuffs_base__pixel_config* c) {
  return c && c->private_impl.pixfmt.repr;
}

static inline wuffs_base__pixel_format  //
wuffs_base__pixel_config__pixel_format(const wuffs_base__pixel_config* c) {
  return c ? c->private_impl.pixfmt : wuffs_base__make_pixel_format(0);
}

static inline wuffs_base__pixel_subsampling  //
wuffs_base__pixel_config__pixel_subsampling(const wuffs_base__pixel_config* c) {
  return c ? c->private_impl.pixsub : wuffs_base__make_pixel_subsampling(0);
}

static inline wuffs_base__rect_ie_u32  //
wuffs_base__pixel_config__bounds(const wuffs_base__pixel_config* c) {
  if (c) {
    wuffs_base__rect_ie_u32 ret;
    ret.min_incl_x = 0;
    ret.min_incl_y = 0;
    ret.max_excl_x = c->private_impl.width;
    ret.max_excl_y = c->private_impl.height;
    return ret;
  }

  wuffs_base__rect_ie_u32 ret;
  ret.min_incl_x = 0;
  ret.min_incl_y = 0;
  ret.max_excl_x = 0;
  ret.max_excl_y = 0;
  return ret;
}

static inline uint32_t  //
wuffs_base__pixel_config__width(const wuffs_base__pixel_config* c) {
  return c ? c->private_impl.width : 0;
}

static inline uint32_t  //
wuffs_base__pixel_config__height(const wuffs_base__pixel_config* c) {
  return c ? c->private_impl.height : 0;
}

// TODO: this is the right API for planar (not interleaved) pixbufs? Should it
// allow decoding into a color model different from the format's intrinsic one?
// For example, decoding a JPEG image straight to RGBA instead of to YCbCr?
static inline uint64_t  //
wuffs_base__pixel_config__pixbuf_len(const wuffs_base__pixel_config* c) {
  if (!c) {
    return 0;
  }
  if (wuffs_base__pixel_format__is_planar(&c->private_impl.pixfmt)) {
    // TODO: support planar pixel formats, concious of pixel subsampling.
    return 0;
  }
  uint32_t bits_per_pixel =
      wuffs_base__pixel_format__bits_per_pixel(&c->private_impl.pixfmt);
  if ((bits_per_pixel == 0) || ((bits_per_pixel % 8) != 0)) {
    // TODO: support fraction-of-byte pixels, e.g. 1 bit per pixel?
    return 0;
  }
  uint64_t bytes_per_pixel = bits_per_pixel / 8;

  uint64_t n =
      ((uint64_t)c->private_impl.width) * ((uint64_t)c->private_impl.height);
  if (n > (UINT64_MAX / bytes_per_pixel)) {
    return 0;
  }
  n *= bytes_per_pixel;

  if (wuffs_base__pixel_format__is_indexed(&c->private_impl.pixfmt)) {
    if (n > (UINT64_MAX - 1024)) {
      return 0;
    }
    n += 1024;
  }

  return n;
}

#ifdef __cplusplus

inline void  //
wuffs_base__pixel_config::set(uint32_t pixfmt_repr,
                              uint32_t pixsub_repr,
                              uint32_t width,
                              uint32_t height) {
  wuffs_base__pixel_config__set(this, pixfmt_repr, pixsub_repr, width, height);
}

inline void  //
wuffs_base__pixel_config::invalidate() {
  wuffs_base__pixel_config__invalidate(this);
}

inline bool  //
wuffs_base__pixel_config::is_valid() const {
  return wuffs_base__pixel_config__is_valid(this);
}

inline wuffs_base__pixel_format  //
wuffs_base__pixel_config::pixel_format() const {
  return wuffs_base__pixel_config__pixel_format(this);
}

inline wuffs_base__pixel_subsampling  //
wuffs_base__pixel_config::pixel_subsampling() const {
  return wuffs_base__pixel_config__pixel_subsampling(this);
}

inline wuffs_base__rect_ie_u32  //
wuffs_base__pixel_config::bounds() const {
  return wuffs_base__pixel_config__bounds(this);
}

inline uint32_t  //
wuffs_base__pixel_config::width() const {
  return wuffs_base__pixel_config__width(this);
}

inline uint32_t  //
wuffs_base__pixel_config::height() const {
  return wuffs_base__pixel_config__height(this);
}

inline uint64_t  //
wuffs_base__pixel_config::pixbuf_len() const {
  return wuffs_base__pixel_config__pixbuf_len(this);
}

#endif  // __cplusplus

// --------

typedef struct wuffs_base__image_config__struct {
  wuffs_base__pixel_config pixcfg;

  // Do not access the private_impl's fields directly. There is no API/ABI
  // compatibility or safety guarantee if you do so.
  struct {
    uint64_t first_frame_io_position;
    bool first_frame_is_opaque;
  } private_impl;

#ifdef __cplusplus
  inline void set(uint32_t pixfmt_repr,
                  uint32_t pixsub_repr,
                  uint32_t width,
                  uint32_t height,
                  uint64_t first_frame_io_position,
                  bool first_frame_is_opaque);
  inline void invalidate();
  inline bool is_valid() const;
  inline uint64_t first_frame_io_position() const;
  inline bool first_frame_is_opaque() const;
#endif  // __cplusplus

} wuffs_base__image_config;

static inline wuffs_base__image_config  //
wuffs_base__null_image_config() {
  wuffs_base__image_config ret;
  ret.pixcfg = wuffs_base__null_pixel_config();
  ret.private_impl.first_frame_io_position = 0;
  ret.private_impl.first_frame_is_opaque = false;
  return ret;
}

// TODO: Should this function return bool? An error type?
static inline void  //
wuffs_base__image_config__set(wuffs_base__image_config* c,
                              uint32_t pixfmt_repr,
                              uint32_t pixsub_repr,
                              uint32_t width,
                              uint32_t height,
                              uint64_t first_frame_io_position,
                              bool first_frame_is_opaque) {
  if (!c) {
    return;
  }
  if (pixfmt_repr) {
    c->pixcfg.private_impl.pixfmt.repr = pixfmt_repr;
    c->pixcfg.private_impl.pixsub.repr = pixsub_repr;
    c->pixcfg.private_impl.width = width;
    c->pixcfg.private_impl.height = height;
    c->private_impl.first_frame_io_position = first_frame_io_position;
    c->private_impl.first_frame_is_opaque = first_frame_is_opaque;
    return;
  }

  c->pixcfg.private_impl.pixfmt.repr = 0;
  c->pixcfg.private_impl.pixsub.repr = 0;
  c->pixcfg.private_impl.width = 0;
  c->pixcfg.private_impl.height = 0;
  c->private_impl.first_frame_io_position = 0;
  c->private_impl.first_frame_is_opaque = 0;
}

static inline void  //
wuffs_base__image_config__invalidate(wuffs_base__image_config* c) {
  if (c) {
    c->pixcfg.private_impl.pixfmt.repr = 0;
    c->pixcfg.private_impl.pixsub.repr = 0;
    c->pixcfg.private_impl.width = 0;
    c->pixcfg.private_impl.height = 0;
    c->private_impl.first_frame_io_position = 0;
    c->private_impl.first_frame_is_opaque = 0;
  }
}

static inline bool  //
wuffs_base__image_config__is_valid(const wuffs_base__image_config* c) {
  return c && wuffs_base__pixel_config__is_valid(&(c->pixcfg));
}

static inline uint64_t  //
wuffs_base__image_config__first_frame_io_position(
    const wuffs_base__image_config* c) {
  return c ? c->private_impl.first_frame_io_position : 0;
}

static inline bool  //
wuffs_base__image_config__first_frame_is_opaque(
    const wuffs_base__image_config* c) {
  return c ? c->private_impl.first_frame_is_opaque : false;
}

#ifdef __cplusplus

inline void  //
wuffs_base__image_config::set(uint32_t pixfmt_repr,
                              uint32_t pixsub_repr,
                              uint32_t width,
                              uint32_t height,
                              uint64_t first_frame_io_position,
                              bool first_frame_is_opaque) {
  wuffs_base__image_config__set(this, pixfmt_repr, pixsub_repr, width, height,
                                first_frame_io_position, first_frame_is_opaque);
}

inline void  //
wuffs_base__image_config::invalidate() {
  wuffs_base__image_config__invalidate(this);
}

inline bool  //
wuffs_base__image_config::is_valid() const {
  return wuffs_base__image_config__is_valid(this);
}

inline uint64_t  //
wuffs_base__image_config::first_frame_io_position() const {
  return wuffs_base__image_config__first_frame_io_position(this);
}

inline bool  //
wuffs_base__image_config::first_frame_is_opaque() const {
  return wuffs_base__image_config__first_frame_is_opaque(this);
}

#endif  // __cplusplus

// --------

// wuffs_base__animation_disposal encodes, for an animated image, how to
// dispose of a frame after displaying it:
//  - None means to draw the next frame on top of this one.
//  - Restore Background means to clear the frame's dirty rectangle to "the
//    background color" (in practice, this means transparent black) before
//    drawing the next frame.
//  - Restore Previous means to undo the current frame, so that the next frame
//    is drawn on top of the previous one.
typedef uint8_t wuffs_base__animation_disposal;

#define WUFFS_BASE__ANIMATION_DISPOSAL__NONE ((wuffs_base__animation_disposal)0)
#define WUFFS_BASE__ANIMATION_DISPOSAL__RESTORE_BACKGROUND \
  ((wuffs_base__animation_disposal)1)
#define WUFFS_BASE__ANIMATION_DISPOSAL__RESTORE_PREVIOUS \
  ((wuffs_base__animation_disposal)2)

// --------

typedef struct wuffs_base__frame_config__struct {
  // Do not access the private_impl's fields directly. There is no API/ABI
  // compatibility or safety guarantee if you do so.
  struct {
    wuffs_base__rect_ie_u32 bounds;
    wuffs_base__flicks duration;
    uint64_t index;
    uint64_t io_position;
    wuffs_base__animation_disposal disposal;
    bool opaque_within_bounds;
    bool overwrite_instead_of_blend;
    wuffs_base__color_u32_argb_premul background_color;
  } private_impl;

#ifdef __cplusplus
  inline void set(wuffs_base__rect_ie_u32 bounds,
                  wuffs_base__flicks duration,
                  uint64_t index,
                  uint64_t io_position,
                  wuffs_base__animation_disposal disposal,
                  bool opaque_within_bounds,
                  bool overwrite_instead_of_blend,
                  wuffs_base__color_u32_argb_premul background_color);
  inline wuffs_base__rect_ie_u32 bounds() const;
  inline uint32_t width() const;
  inline uint32_t height() const;
  inline wuffs_base__flicks duration() const;
  inline uint64_t index() const;
  inline uint64_t io_position() const;
  inline wuffs_base__animation_disposal disposal() const;
  inline bool opaque_within_bounds() const;
  inline bool overwrite_instead_of_blend() const;
  inline wuffs_base__color_u32_argb_premul background_color() const;
#endif  // __cplusplus

} wuffs_base__frame_config;

static inline wuffs_base__frame_config  //
wuffs_base__null_frame_config() {
  wuffs_base__frame_config ret;
  ret.private_impl.bounds = wuffs_base__make_rect_ie_u32(0, 0, 0, 0);
  ret.private_impl.duration = 0;
  ret.private_impl.index = 0;
  ret.private_impl.io_position = 0;
  ret.private_impl.disposal = 0;
  ret.private_impl.opaque_within_bounds = false;
  ret.private_impl.overwrite_instead_of_blend = false;
  return ret;
}

static inline void  //
wuffs_base__frame_config__set(
    wuffs_base__frame_config* c,
    wuffs_base__rect_ie_u32 bounds,
    wuffs_base__flicks duration,
    uint64_t index,
    uint64_t io_position,
    wuffs_base__animation_disposal disposal,
    bool opaque_within_bounds,
    bool overwrite_instead_of_blend,
    wuffs_base__color_u32_argb_premul background_color) {
  if (!c) {
    return;
  }

  c->private_impl.bounds = bounds;
  c->private_impl.duration = duration;
  c->private_impl.index = index;
  c->private_impl.io_position = io_position;
  c->private_impl.disposal = disposal;
  c->private_impl.opaque_within_bounds = opaque_within_bounds;
  c->private_impl.overwrite_instead_of_blend = overwrite_instead_of_blend;
  c->private_impl.background_color = background_color;
}

static inline wuffs_base__rect_ie_u32  //
wuffs_base__frame_config__bounds(const wuffs_base__frame_config* c) {
  if (c) {
    return c->private_impl.bounds;
  }

  wuffs_base__rect_ie_u32 ret;
  ret.min_incl_x = 0;
  ret.min_incl_y = 0;
  ret.max_excl_x = 0;
  ret.max_excl_y = 0;
  return ret;
}

static inline uint32_t  //
wuffs_base__frame_config__width(const wuffs_base__frame_config* c) {
  return c ? wuffs_base__rect_ie_u32__width(&c->private_impl.bounds) : 0;
}

static inline uint32_t  //
wuffs_base__frame_config__height(const wuffs_base__frame_config* c) {
  return c ? wuffs_base__rect_ie_u32__height(&c->private_impl.bounds) : 0;
}

// wuffs_base__frame_config__duration returns the amount of time to display
// this frame. Zero means to display forever - a still (non-animated) image.
static inline wuffs_base__flicks  //
wuffs_base__frame_config__duration(const wuffs_base__frame_config* c) {
  return c ? c->private_impl.duration : 0;
}

// wuffs_base__frame_config__index returns the index of this frame. The first
// frame in an image has index 0, the second frame has index 1, and so on.
static inline uint64_t  //
wuffs_base__frame_config__index(const wuffs_base__frame_config* c) {
  return c ? c->private_impl.index : 0;
}

// wuffs_base__frame_config__io_position returns the I/O stream position before
// the frame config.
static inline uint64_t  //
wuffs_base__frame_config__io_position(const wuffs_base__frame_config* c) {
  return c ? c->private_impl.io_position : 0;
}

// wuffs_base__frame_config__disposal returns, for an animated image, how to
// dispose of this frame after displaying it.
static inline wuffs_base__animation_disposal  //
wuffs_base__frame_config__disposal(const wuffs_base__frame_config* c) {
  return c ? c->private_impl.disposal : 0;
}

// wuffs_base__frame_config__opaque_within_bounds returns whether all pixels
// within the frame's bounds are fully opaque. It makes no claim about pixels
// outside the frame bounds but still inside the overall image. The two
// bounding rectangles can differ for animated images.
//
// Its semantics are conservative. It is valid for a fully opaque frame to have
// this value be false: a false negative.
//
// If true, drawing the frame with WUFFS_BASE__PIXEL_BLEND__SRC and
// WUFFS_BASE__PIXEL_BLEND__SRC_OVER should be equivalent, in terms of
// resultant pixels, but the former may be faster.
static inline bool  //
wuffs_base__frame_config__opaque_within_bounds(
    const wuffs_base__frame_config* c) {
  return c && c->private_impl.opaque_within_bounds;
}

// wuffs_base__frame_config__overwrite_instead_of_blend returns, for an
// animated image, whether to ignore the previous image state (within the frame
// bounds) when drawing this incremental frame. Equivalently, whether to use
// WUFFS_BASE__PIXEL_BLEND__SRC instead of WUFFS_BASE__PIXEL_BLEND__SRC_OVER.
//
// The WebP spec (https://developers.google.com/speed/webp/docs/riff_container)
// calls this the "Blending method" bit. WebP's "Do not blend" corresponds to
// Wuffs' "overwrite_instead_of_blend".
static inline bool  //
wuffs_base__frame_config__overwrite_instead_of_blend(
    const wuffs_base__frame_config* c) {
  return c && c->private_impl.overwrite_instead_of_blend;
}

static inline wuffs_base__color_u32_argb_premul  //
wuffs_base__frame_config__background_color(const wuffs_base__frame_config* c) {
  return c ? c->private_impl.background_color : 0;
}

#ifdef __cplusplus

inline void  //
wuffs_base__frame_config::set(
    wuffs_base__rect_ie_u32 bounds,
    wuffs_base__flicks duration,
    uint64_t index,
    uint64_t io_position,
    wuffs_base__animation_disposal disposal,
    bool opaque_within_bounds,
    bool overwrite_instead_of_blend,
    wuffs_base__color_u32_argb_premul background_color) {
  wuffs_base__frame_config__set(this, bounds, duration, index, io_position,
                                disposal, opaque_within_bounds,
                                overwrite_instead_of_blend, background_color);
}

inline wuffs_base__rect_ie_u32  //
wuffs_base__frame_config::bounds() const {
  return wuffs_base__frame_config__bounds(this);
}

inline uint32_t  //
wuffs_base__frame_config::width() const {
  return wuffs_base__frame_config__width(this);
}

inline uint32_t  //
wuffs_base__frame_config::height() const {
  return wuffs_base__frame_config__height(this);
}

inline wuffs_base__flicks  //
wuffs_base__frame_config::duration() const {
  return wuffs_base__frame_config__duration(this);
}

inline uint64_t  //
wuffs_base__frame_config::index() const {
  return wuffs_base__frame_config__index(this);
}

inline uint64_t  //
wuffs_base__frame_config::io_position() const {
  return wuffs_base__frame_config__io_position(this);
}

inline wuffs_base__animation_disposal  //
wuffs_base__frame_config::disposal() const {
  return wuffs_base__frame_config__disposal(this);
}

inline bool  //
wuffs_base__frame_config::opaque_within_bounds() const {
  return wuffs_base__frame_config__opaque_within_bounds(this);
}

inline bool  //
wuffs_base__frame_config::overwrite_instead_of_blend() const {
  return wuffs_base__frame_config__overwrite_instead_of_blend(this);
}

inline wuffs_base__color_u32_argb_premul  //
wuffs_base__frame_config::background_color() const {
  return wuffs_base__frame_config__background_color(this);
}

#endif  // __cplusplus

// --------

typedef struct wuffs_base__pixel_buffer__struct {
  wuffs_base__pixel_config pixcfg;

  // Do not access the private_impl's fields directly. There is no API/ABI
  // compatibility or safety guarantee if you do so.
  struct {
    wuffs_base__table_u8 planes[WUFFS_BASE__PIXEL_FORMAT__NUM_PLANES_MAX];
    // TODO: color spaces.
  } private_impl;

#ifdef __cplusplus
  inline wuffs_base__status set_from_slice(
      const wuffs_base__pixel_config* pixcfg,
      wuffs_base__slice_u8 pixbuf_memory);
  inline wuffs_base__status set_from_table(
      const wuffs_base__pixel_config* pixcfg,
      wuffs_base__table_u8 pixbuf_memory);
  inline wuffs_base__slice_u8 palette();
  inline wuffs_base__slice_u8 palette_or_else(wuffs_base__slice_u8 fallback);
  inline wuffs_base__pixel_format pixel_format() const;
  inline wuffs_base__table_u8 plane(uint32_t p);
  inline wuffs_base__color_u32_argb_premul color_u32_at(uint32_t x,
                                                        uint32_t y) const;
  inline wuffs_base__status set_color_u32_at(
      uint32_t x,
      uint32_t y,
      wuffs_base__color_u32_argb_premul color);
#endif  // __cplusplus

} wuffs_base__pixel_buffer;

static inline wuffs_base__pixel_buffer  //
wuffs_base__null_pixel_buffer() {
  wuffs_base__pixel_buffer ret;
  ret.pixcfg = wuffs_base__null_pixel_config();
  ret.private_impl.planes[0] = wuffs_base__empty_table_u8();
  ret.private_impl.planes[1] = wuffs_base__empty_table_u8();
  ret.private_impl.planes[2] = wuffs_base__empty_table_u8();
  ret.private_impl.planes[3] = wuffs_base__empty_table_u8();
  return ret;
}

static inline wuffs_base__status  //
wuffs_base__pixel_buffer__set_from_slice(wuffs_base__pixel_buffer* pb,
                                         const wuffs_base__pixel_config* pixcfg,
                                         wuffs_base__slice_u8 pixbuf_memory) {
  if (!pb) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  memset(pb, 0, sizeof(*pb));
  if (!pixcfg) {
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if (wuffs_base__pixel_format__is_planar(&pixcfg->private_impl.pixfmt)) {
    // TODO: support planar pixel formats, concious of pixel subsampling.
    return wuffs_base__make_status(wuffs_base__error__unsupported_option);
  }
  uint32_t bits_per_pixel =
      wuffs_base__pixel_format__bits_per_pixel(&pixcfg->private_impl.pixfmt);
  if ((bits_per_pixel == 0) || ((bits_per_pixel % 8) != 0)) {
    // TODO: support fraction-of-byte pixels, e.g. 1 bit per pixel?
    return wuffs_base__make_status(wuffs_base__error__unsupported_option);
  }
  uint64_t bytes_per_pixel = bits_per_pixel / 8;

  uint8_t* ptr = pixbuf_memory.ptr;
  uint64_t len = pixbuf_memory.len;
  if (wuffs_base__pixel_format__is_indexed(&pixcfg->private_impl.pixfmt)) {
    // Split a 1024 byte chunk (256 palette entries × 4 bytes per entry) from
    // the start of pixbuf_memory. We split from the start, not the end, so
    // that the both chunks' pointers have the same alignment as the original
    // pointer, up to an alignment of 1024.
    if (len < 1024) {
      return wuffs_base__make_status(
          wuffs_base__error__bad_argument_length_too_short);
    }
    wuffs_base__table_u8* tab =
        &pb->private_impl
             .planes[WUFFS_BASE__PIXEL_FORMAT__INDEXED__COLOR_PLANE];
    tab->ptr = ptr;
    tab->width = 1024;
    tab->height = 1;
    tab->stride = 1024;
    ptr += 1024;
    len -= 1024;
  }

  uint64_t wh = ((uint64_t)pixcfg->private_impl.width) *
                ((uint64_t)pixcfg->private_impl.height);
  size_t width = (size_t)(pixcfg->private_impl.width);
  if ((wh > (UINT64_MAX / bytes_per_pixel)) ||
      (width > (SIZE_MAX / bytes_per_pixel))) {
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  wh *= bytes_per_pixel;
  width = ((size_t)(width * bytes_per_pixel));
  if (wh > len) {
    return wuffs_base__make_status(
        wuffs_base__error__bad_argument_length_too_short);
  }

  pb->pixcfg = *pixcfg;
  wuffs_base__table_u8* tab = &pb->private_impl.planes[0];
  tab->ptr = ptr;
  tab->width = width;
  tab->height = pixcfg->private_impl.height;
  tab->stride = width;
  return wuffs_base__make_status(NULL);
}

static inline wuffs_base__status  //
wuffs_base__pixel_buffer__set_from_table(wuffs_base__pixel_buffer* pb,
                                         const wuffs_base__pixel_config* pixcfg,
                                         wuffs_base__table_u8 pixbuf_memory) {
  if (!pb) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  memset(pb, 0, sizeof(*pb));
  if (!pixcfg ||
      wuffs_base__pixel_format__is_planar(&pixcfg->private_impl.pixfmt)) {
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  uint32_t bits_per_pixel =
      wuffs_base__pixel_format__bits_per_pixel(&pixcfg->private_impl.pixfmt);
  if ((bits_per_pixel == 0) || ((bits_per_pixel % 8) != 0)) {
    // TODO: support fraction-of-byte pixels, e.g. 1 bit per pixel?
    return wuffs_base__make_status(wuffs_base__error__unsupported_option);
  }
  uint64_t bytes_per_pixel = bits_per_pixel / 8;

  uint64_t width_in_bytes =
      ((uint64_t)pixcfg->private_impl.width) * bytes_per_pixel;
  if ((width_in_bytes > pixbuf_memory.width) ||
      (pixcfg->private_impl.height > pixbuf_memory.height)) {
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }

  pb->pixcfg = *pixcfg;
  pb->private_impl.planes[0] = pixbuf_memory;
  return wuffs_base__make_status(NULL);
}

// wuffs_base__pixel_buffer__palette returns the palette color data. If
// non-empty, it will have length 1024.
static inline wuffs_base__slice_u8  //
wuffs_base__pixel_buffer__palette(wuffs_base__pixel_buffer* pb) {
  if (pb &&
      wuffs_base__pixel_format__is_indexed(&pb->pixcfg.private_impl.pixfmt)) {
    wuffs_base__table_u8* tab =
        &pb->private_impl
             .planes[WUFFS_BASE__PIXEL_FORMAT__INDEXED__COLOR_PLANE];
    if ((tab->width == 1024) && (tab->height == 1)) {
      return wuffs_base__make_slice_u8(tab->ptr, 1024);
    }
  }
  return wuffs_base__make_slice_u8(NULL, 0);
}

static inline wuffs_base__slice_u8  //
wuffs_base__pixel_buffer__palette_or_else(wuffs_base__pixel_buffer* pb,
                                          wuffs_base__slice_u8 fallback) {
  if (pb &&
      wuffs_base__pixel_format__is_indexed(&pb->pixcfg.private_impl.pixfmt)) {
    wuffs_base__table_u8* tab =
        &pb->private_impl
             .planes[WUFFS_BASE__PIXEL_FORMAT__INDEXED__COLOR_PLANE];
    if ((tab->width == 1024) && (tab->height == 1)) {
      return wuffs_base__make_slice_u8(tab->ptr, 1024);
    }
  }
  return fallback;
}

static inline wuffs_base__pixel_format  //
wuffs_base__pixel_buffer__pixel_format(const wuffs_base__pixel_buffer* pb) {
  if (pb) {
    return pb->pixcfg.private_impl.pixfmt;
  }
  return wuffs_base__make_pixel_format(WUFFS_BASE__PIXEL_FORMAT__INVALID);
}

static inline wuffs_base__table_u8  //
wuffs_base__pixel_buffer__plane(wuffs_base__pixel_buffer* pb, uint32_t p) {
  if (pb && (p < WUFFS_BASE__PIXEL_FORMAT__NUM_PLANES_MAX)) {
    return pb->private_impl.planes[p];
  }

  wuffs_base__table_u8 ret;
  ret.ptr = NULL;
  ret.width = 0;
  ret.height = 0;
  ret.stride = 0;
  return ret;
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__color_u32_argb_premul  //
wuffs_base__pixel_buffer__color_u32_at(const wuffs_base__pixel_buffer* pb,
                                       uint32_t x,
                                       uint32_t y);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_base__pixel_buffer__set_color_u32_at(
    wuffs_base__pixel_buffer* pb,
    uint32_t x,
    uint32_t y,
    wuffs_base__color_u32_argb_premul color);

#ifdef __cplusplus

inline wuffs_base__status  //
wuffs_base__pixel_buffer::set_from_slice(
    const wuffs_base__pixel_config* pixcfg_arg,
    wuffs_base__slice_u8 pixbuf_memory) {
  return wuffs_base__pixel_buffer__set_from_slice(this, pixcfg_arg,
                                                  pixbuf_memory);
}

inline wuffs_base__status  //
wuffs_base__pixel_buffer::set_from_table(
    const wuffs_base__pixel_config* pixcfg_arg,
    wuffs_base__table_u8 pixbuf_memory) {
  return wuffs_base__pixel_buffer__set_from_table(this, pixcfg_arg,
                                                  pixbuf_memory);
}

inline wuffs_base__slice_u8  //
wuffs_base__pixel_buffer::palette() {
  return wuffs_base__pixel_buffer__palette(this);
}

inline wuffs_base__slice_u8  //
wuffs_base__pixel_buffer::palette_or_else(wuffs_base__slice_u8 fallback) {
  return wuffs_base__pixel_buffer__palette_or_else(this, fallback);
}

inline wuffs_base__pixel_format  //
wuffs_base__pixel_buffer::pixel_format() const {
  return wuffs_base__pixel_buffer__pixel_format(this);
}

inline wuffs_base__table_u8  //
wuffs_base__pixel_buffer::plane(uint32_t p) {
  return wuffs_base__pixel_buffer__plane(this, p);
}

inline wuffs_base__color_u32_argb_premul  //
wuffs_base__pixel_buffer::color_u32_at(uint32_t x, uint32_t y) const {
  return wuffs_base__pixel_buffer__color_u32_at(this, x, y);
}

inline wuffs_base__status  //
wuffs_base__pixel_buffer::set_color_u32_at(
    uint32_t x,
    uint32_t y,
    wuffs_base__color_u32_argb_premul color) {
  return wuffs_base__pixel_buffer__set_color_u32_at(this, x, y, color);
}

#endif  // __cplusplus

// --------

typedef struct wuffs_base__decode_frame_options__struct {
  // Do not access the private_impl's fields directly. There is no API/ABI
  // compatibility or safety guarantee if you do so.
  struct {
    uint8_t TODO;
  } private_impl;

#ifdef __cplusplus
#endif  // __cplusplus

} wuffs_base__decode_frame_options;

#ifdef __cplusplus

#endif  // __cplusplus

// --------

// wuffs_base__pixel_palette__closest_element returns the index of the palette
// element that minimizes the sum of squared differences of the four ARGB
// channels, working in premultiplied alpha. Ties favor the smaller index.
//
// The palette_slice.len may equal (N*4), for N less than 256, which means that
// only the first N palette elements are considered. It returns 0 when N is 0.
//
// Applying this function on a per-pixel basis will not produce whole-of-image
// dithering.
WUFFS_BASE__MAYBE_STATIC uint8_t  //
wuffs_base__pixel_palette__closest_element(
    wuffs_base__slice_u8 palette_slice,
    wuffs_base__pixel_format palette_format,
    wuffs_base__color_u32_argb_premul c);

// --------

// TODO: should the func type take restrict pointers?
typedef uint64_t (*wuffs_base__pixel_swizzler__func)(uint8_t* dst_ptr,
                                                     size_t dst_len,
                                                     uint8_t* dst_palette_ptr,
                                                     size_t dst_palette_len,
                                                     const uint8_t* src_ptr,
                                                     size_t src_len);

typedef uint64_t (*wuffs_base__pixel_swizzler__transparent_black_func)(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    uint64_t num_pixels,
    uint32_t dst_pixfmt_bytes_per_pixel);

typedef struct wuffs_base__pixel_swizzler__struct {
  // Do not access the private_impl's fields directly. There is no API/ABI
  // compatibility or safety guarantee if you do so.
  struct {
    wuffs_base__pixel_swizzler__func func;
    wuffs_base__pixel_swizzler__transparent_black_func transparent_black_func;
    uint32_t dst_pixfmt_bytes_per_pixel;
    uint32_t src_pixfmt_bytes_per_pixel;
  } private_impl;

#ifdef __cplusplus
  inline wuffs_base__status prepare(wuffs_base__pixel_format dst_pixfmt,
                                    wuffs_base__slice_u8 dst_palette,
                                    wuffs_base__pixel_format src_pixfmt,
                                    wuffs_base__slice_u8 src_palette,
                                    wuffs_base__pixel_blend blend);
  inline uint64_t swizzle_interleaved_from_slice(
      wuffs_base__slice_u8 dst,
      wuffs_base__slice_u8 dst_palette,
      wuffs_base__slice_u8 src) const;
#endif  // __cplusplus

} wuffs_base__pixel_swizzler;

// wuffs_base__pixel_swizzler__prepare readies the pixel swizzler so that its
// other methods may be called.
//
// For modular builds that divide the base module into sub-modules, using this
// function requires the WUFFS_CONFIG__MODULE__BASE__PIXCONV sub-module, not
// just WUFFS_CONFIG__MODULE__BASE__CORE.
WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_base__pixel_swizzler__prepare(wuffs_base__pixel_swizzler* p,
                                    wuffs_base__pixel_format dst_pixfmt,
                                    wuffs_base__slice_u8 dst_palette,
                                    wuffs_base__pixel_format src_pixfmt,
                                    wuffs_base__slice_u8 src_palette,
                                    wuffs_base__pixel_blend blend);

// wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice converts pixels
// from a source format to a destination format.
//
// For modular builds that divide the base module into sub-modules, using this
// function requires the WUFFS_CONFIG__MODULE__BASE__PIXCONV sub-module, not
// just WUFFS_CONFIG__MODULE__BASE__CORE.
WUFFS_BASE__MAYBE_STATIC uint64_t  //
wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(
    const wuffs_base__pixel_swizzler* p,
    wuffs_base__slice_u8 dst,
    wuffs_base__slice_u8 dst_palette,
    wuffs_base__slice_u8 src);

#ifdef __cplusplus

inline wuffs_base__status  //
wuffs_base__pixel_swizzler::prepare(wuffs_base__pixel_format dst_pixfmt,
                                    wuffs_base__slice_u8 dst_palette,
                                    wuffs_base__pixel_format src_pixfmt,
                                    wuffs_base__slice_u8 src_palette,
                                    wuffs_base__pixel_blend blend) {
  return wuffs_base__pixel_swizzler__prepare(this, dst_pixfmt, dst_palette,
                                             src_pixfmt, src_palette, blend);
}

uint64_t  //
wuffs_base__pixel_swizzler::swizzle_interleaved_from_slice(
    wuffs_base__slice_u8 dst,
    wuffs_base__slice_u8 dst_palette,
    wuffs_base__slice_u8 src) const {
  return wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(
      this, dst, dst_palette, src);
}

#endif  // __cplusplus

// ---------------- String Conversions

// Options (bitwise or'ed together) for wuffs_base__parse_number_xxx
// functions. The XXX options apply to both integer and floating point. The FXX
// options apply only to floating point.

#define WUFFS_BASE__PARSE_NUMBER_XXX__DEFAULT_OPTIONS ((uint32_t)0x00000000)

// WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_MULTIPLE_LEADING_ZEROES means to accept
// inputs like "00", "0644" and "00.7". By default, they are rejected.
#define WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_MULTIPLE_LEADING_ZEROES \
  ((uint32_t)0x00000001)

// WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES means to accept inputs like
// "1__2" and "_3.141_592". By default, they are rejected.
#define WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES ((uint32_t)0x00000002)

// WUFFS_BASE__PARSE_NUMBER_FXX__DECIMAL_SEPARATOR_IS_A_COMMA means to accept
// "1,5" and not "1.5" as one-and-a-half.
//
// If the caller wants to accept either, it is responsible for canonicalizing
// the input before calling wuffs_base__parse_number_fxx. The caller also has
// more context on e.g. exactly how to treat something like "$1,234".
#define WUFFS_BASE__PARSE_NUMBER_FXX__DECIMAL_SEPARATOR_IS_A_COMMA \
  ((uint32_t)0x00000010)

// WUFFS_BASE__PARSE_NUMBER_FXX__REJECT_INF_AND_NAN means to reject inputs that
// would lead to infinite or Not-a-Number floating point values. By default,
// they are accepted.
//
// This affects the literal "inf" as input, but also affects inputs like
// "1e999" that would overflow double-precision floating point.
#define WUFFS_BASE__PARSE_NUMBER_FXX__REJECT_INF_AND_NAN ((uint32_t)0x00000020)

// --------

// Options (bitwise or'ed together) for wuffs_base__render_number_xxx
// functions. The XXX options apply to both integer and floating point. The FXX
// options apply only to floating point.

#define WUFFS_BASE__RENDER_NUMBER_XXX__DEFAULT_OPTIONS ((uint32_t)0x00000000)

// WUFFS_BASE__RENDER_NUMBER_XXX__ALIGN_RIGHT means to render to the right side
// (higher indexes) of the destination slice, leaving any untouched bytes on
// the left side (lower indexes). The default is vice versa: rendering on the
// left with slack on the right.
#define WUFFS_BASE__RENDER_NUMBER_XXX__ALIGN_RIGHT ((uint32_t)0x00000100)

// WUFFS_BASE__RENDER_NUMBER_XXX__LEADING_PLUS_SIGN means to render the leading
// "+" for non-negative numbers: "+0" and "+12.3" instead of "0" and "12.3".
#define WUFFS_BASE__RENDER_NUMBER_XXX__LEADING_PLUS_SIGN ((uint32_t)0x00000200)

// WUFFS_BASE__RENDER_NUMBER_FXX__DECIMAL_SEPARATOR_IS_A_COMMA means to render
// one-and-a-half as "1,5" instead of "1.5".
#define WUFFS_BASE__RENDER_NUMBER_FXX__DECIMAL_SEPARATOR_IS_A_COMMA \
  ((uint32_t)0x00001000)

// WUFFS_BASE__RENDER_NUMBER_FXX__EXPONENT_ETC means whether to never
// (EXPONENT_ABSENT, equivalent to printf's "%f") or to always
// (EXPONENT_PRESENT, equivalent to printf's "%e") render a floating point
// number as "1.23e+05" instead of "123000".
//
// Having both bits set is the same has having neither bit set, where the
// notation used depends on whether the exponent is sufficiently large: "0.5"
// is preferred over "5e-01" but "5e-09" is preferred over "0.000000005".
#define WUFFS_BASE__RENDER_NUMBER_FXX__EXPONENT_ABSENT ((uint32_t)0x00002000)
#define WUFFS_BASE__RENDER_NUMBER_FXX__EXPONENT_PRESENT ((uint32_t)0x00004000)

// WUFFS_BASE__RENDER_NUMBER_FXX__JUST_ENOUGH_PRECISION means to render the
// smallest number of digits so that parsing the resultant string will recover
// the same double-precision floating point number.
//
// For example, double-precision cannot distinguish between 0.3 and
// 0.299999999999999988897769753748434595763683319091796875, so when this bit
// is set, rendering the latter will produce "0.3" but rendering
// 0.3000000000000000444089209850062616169452667236328125 will produce
// "0.30000000000000004".
#define WUFFS_BASE__RENDER_NUMBER_FXX__JUST_ENOUGH_PRECISION \
  ((uint32_t)0x00008000)

// ---------------- IEEE 754 Floating Point

// wuffs_base__ieee_754_bit_representation__etc converts between a double
// precision numerical value and its IEEE 754 representations:
//   - 16-bit: 1 sign bit,  5 exponent bits, 10 explicit significand bits.
//   - 32-bit: 1 sign bit,  8 exponent bits, 23 explicit significand bits.
//   - 64-bit: 1 sign bit, 11 exponent bits, 52 explicit significand bits.
//
// For example, it converts between:
//  - +1.0 and 0x3C00, 0x3F80_0000 or 0x3FF0_0000_0000_0000.
//  - +5.5 and 0x4580, 0x40B0_0000 or 0x4016_0000_0000_0000.
//  - -inf and 0xFC00, 0xFF80_0000 or 0xFFF0_0000_0000_0000.
//
// Converting from f64 to shorter formats (f16 or f32, represented in C as
// uint16_t and uint32_t) may be lossy. Such functions have names that look
// like etc_truncate, as converting finite numbers produce equal or smaller
// (closer-to-zero) finite numbers. For example, 1048576.0 is a perfectly valid
// f64 number, but converting it to a f16 (with truncation) produces 65504.0,
// the largest finite f16 number. Truncating a f64-typed value d to f32 does
// not always produce the same result as the C-style cast ((float)d), as
// casting can convert from finite numbers to infinite ones.
//
// Converting infinities or NaNs produces infinities or NaNs and always report
// no loss, even though there a multiple NaN representations so that round-
// tripping a f64-typed NaN may produce a different 64 bits. Nonetheless, the
// etc_truncate functions preserve a NaN's "quiet vs signaling" bit.
//
// See https://en.wikipedia.org/wiki/Double-precision_floating-point_format

typedef struct wuffs_base__lossy_value_u16__struct {
  uint16_t value;
  bool lossy;
} wuffs_base__lossy_value_u16;

typedef struct wuffs_base__lossy_value_u32__struct {
  uint32_t value;
  bool lossy;
} wuffs_base__lossy_value_u32;

WUFFS_BASE__MAYBE_STATIC wuffs_base__lossy_value_u16  //
wuffs_base__ieee_754_bit_representation__from_f64_to_u16_truncate(double f);

WUFFS_BASE__MAYBE_STATIC wuffs_base__lossy_value_u32  //
wuffs_base__ieee_754_bit_representation__from_f64_to_u32_truncate(double f);

static inline uint64_t  //
wuffs_base__ieee_754_bit_representation__from_f64_to_u64(double f) {
  uint64_t u = 0;
  if (sizeof(uint64_t) == sizeof(double)) {
    memcpy(&u, &f, sizeof(uint64_t));
  }
  return u;
}

static inline double  //
wuffs_base__ieee_754_bit_representation__from_u16_to_f64(uint16_t u) {
  uint64_t v = ((uint64_t)(u & 0x8000)) << 48;

  do {
    uint64_t exp = (u >> 10) & 0x1F;
    uint64_t man = u & 0x3FF;
    if (exp == 0x1F) {  // Infinity or NaN.
      exp = 2047;
    } else if (exp != 0) {  // Normal.
      exp += 1008;          // 1008 = 1023 - 15, the difference in biases.
    } else if (man != 0) {  // Subnormal but non-zero.
      uint32_t clz = wuffs_base__count_leading_zeroes_u64(man);
      exp = 1062 - clz;  // 1062 = 1008 + 64 - 10.
      man = 0x3FF & (man << (clz - 53));
    } else {  // Zero.
      break;
    }
    v |= (exp << 52) | (man << 42);
  } while (0);

  double f = 0;
  if (sizeof(uint64_t) == sizeof(double)) {
    memcpy(&f, &v, sizeof(uint64_t));
  }
  return f;
}

static inline double  //
wuffs_base__ieee_754_bit_representation__from_u32_to_f64(uint32_t u) {
  float f = 0;
  if (sizeof(uint32_t) == sizeof(float)) {
    memcpy(&f, &u, sizeof(uint32_t));
  }
  return (double)f;
}

static inline double  //
wuffs_base__ieee_754_bit_representation__from_u64_to_f64(uint64_t u) {
  double f = 0;
  if (sizeof(uint64_t) == sizeof(double)) {
    memcpy(&f, &u, sizeof(uint64_t));
  }
  return f;
}

// ---------------- Parsing and Rendering Numbers

// wuffs_base__parse_number_f64 parses the floating point number in s. For
// example, if s contains the bytes "1.5" then it will return the double 1.5.
//
// It returns an error if s does not contain a floating point number.
//
// It does not necessarily return an error if the conversion is lossy, e.g. if
// s is "0.3", which double-precision floating point cannot represent exactly.
//
// Similarly, the returned value may be infinite (and no error returned) even
// if s was not "inf", when the input is nominally finite but sufficiently
// larger than DBL_MAX, about 1.8e+308.
//
// It is similar to the C standard library's strtod function, but:
//  - Errors are returned in-band (in a result type), not out-of-band (errno).
//  - It takes a slice (a pointer and length), not a NUL-terminated C string.
//  - It does not take an optional endptr argument. It does not allow a partial
//    parse: it returns an error unless all of s is consumed.
//  - It does not allow whitespace, leading or otherwise.
//  - It does not allow hexadecimal floating point numbers.
//  - It is not affected by i18n / l10n settings such as environment variables.
//
// The options argument can change these, but by default, it:
//  - Allows "inf", "+Infinity" and "-NAN", case insensitive. Similarly,
//    without an explicit opt-out, it would successfully parse "1e999" as
//    infinity, even though it overflows double-precision floating point.
//  - Rejects underscores. With an explicit opt-in, "_3.141_592" would
//    successfully parse as an approximation to π.
//  - Rejects unnecessary leading zeroes: "00", "0644" and "00.7".
//  - Uses a dot '1.5' instead of a comma '1,5' for the decimal separator.
//
// For modular builds that divide the base module into sub-modules, using this
// function requires the WUFFS_CONFIG__MODULE__BASE__FLOATCONV sub-module, not
// just WUFFS_CONFIG__MODULE__BASE__CORE.
WUFFS_BASE__MAYBE_STATIC wuffs_base__result_f64  //
wuffs_base__parse_number_f64(wuffs_base__slice_u8 s, uint32_t options);

// wuffs_base__parse_number_i64 parses the ASCII integer in s. For example, if
// s contains the bytes "-123" then it will return the int64_t -123.
//
// It returns an error if s does not contain an integer or if the integer
// within would overflow an int64_t.
//
// It is similar to wuffs_base__parse_number_u64 but it returns a signed
// integer, not an unsigned integer. It also allows a leading '+' or '-'.
//
// For modular builds that divide the base module into sub-modules, using this
// function requires the WUFFS_CONFIG__MODULE__BASE__INTCONV sub-module, not
// just WUFFS_CONFIG__MODULE__BASE__CORE.
WUFFS_BASE__MAYBE_STATIC wuffs_base__result_i64  //
wuffs_base__parse_number_i64(wuffs_base__slice_u8 s, uint32_t options);

// wuffs_base__parse_number_u64 parses the ASCII integer in s. For example, if
// s contains the bytes "123" then it will return the uint64_t 123.
//
// It returns an error if s does not contain an integer or if the integer
// within would overflow a uint64_t.
//
// It is similar to the C standard library's strtoull function, but:
//  - Errors are returned in-band (in a result type), not out-of-band (errno).
//  - It takes a slice (a pointer and length), not a NUL-terminated C string.
//  - It does not take an optional endptr argument. It does not allow a partial
//    parse: it returns an error unless all of s is consumed.
//  - It does not allow whitespace, leading or otherwise.
//  - It does not allow a leading '+' or '-'.
//  - It does not take a base argument (e.g. base 10 vs base 16). Instead, it
//    always accepts both decimal (e.g "1234", "0d5678") and hexadecimal (e.g.
//    "0x9aBC"). The caller is responsible for prior filtering of e.g. hex
//    numbers if they are unwanted. For example, Wuffs' JSON decoder will only
//    produce a wuffs_base__token for decimal numbers, not hexadecimal.
//  - It is not affected by i18n / l10n settings such as environment variables.
//
// The options argument can change these, but by default, it:
//  - Rejects underscores. With an explicit opt-in, "__0D_1_002" would
//    successfully parse as "one thousand and two". Underscores are still
//    rejected inside the optional 2-byte opening "0d" or "0X" that denotes
//    base-10 or base-16.
//  - Rejects unnecessary leading zeroes: "00" and "0644".
//
// For modular builds that divide the base module into sub-modules, using this
// function requires the WUFFS_CONFIG__MODULE__BASE__INTCONV sub-module, not
// just WUFFS_CONFIG__MODULE__BASE__CORE.
WUFFS_BASE__MAYBE_STATIC wuffs_base__result_u64  //
wuffs_base__parse_number_u64(wuffs_base__slice_u8 s, uint32_t options);

// --------

// WUFFS_BASE__I64__BYTE_LENGTH__MAX_INCL is the string length of
// "-9223372036854775808" and "+9223372036854775807", INT64_MIN and INT64_MAX.
#define WUFFS_BASE__I64__BYTE_LENGTH__MAX_INCL 20

// WUFFS_BASE__U64__BYTE_LENGTH__MAX_INCL is the string length of
// "+18446744073709551615", UINT64_MAX.
#define WUFFS_BASE__U64__BYTE_LENGTH__MAX_INCL 21

// wuffs_base__render_number_f64 writes the decimal encoding of x to dst and
// returns the number of bytes written. If dst is shorter than the entire
// encoding, it returns 0 (and no bytes are written).
//
// For those familiar with C's printf or Go's fmt.Printf functions:
//  - "%e" means the WUFFS_BASE__RENDER_NUMBER_FXX__EXPONENT_PRESENT option.
//  - "%f" means the WUFFS_BASE__RENDER_NUMBER_FXX__EXPONENT_ABSENT  option.
//  - "%g" means neither or both bits are set.
//
// The precision argument controls the number of digits rendered, excluding the
// exponent (the "e+05" in "1.23e+05"):
//  - for "%e" and "%f" it is the number of digits after the decimal separator,
//  - for "%g" it is the number of significant digits (and trailing zeroes are
//    removed).
//
// A precision of 6 gives similar output to printf's defaults.
//
// A precision greater than 4095 is equivalent to 4095.
//
// The precision argument is ignored when the
// WUFFS_BASE__RENDER_NUMBER_FXX__JUST_ENOUGH_PRECISION option is set. This is
// similar to Go's strconv.FormatFloat with a negative (i.e. non-sensical)
// precision, but there is no corresponding feature in C's printf.
//
// Extreme values of x will be rendered as "NaN", "Inf" (or "+Inf" if the
// WUFFS_BASE__RENDER_NUMBER_XXX__LEADING_PLUS_SIGN option is set) or "-Inf".
//
// For modular builds that divide the base module into sub-modules, using this
// function requires the WUFFS_CONFIG__MODULE__BASE__FLOATCONV sub-module, not
// just WUFFS_CONFIG__MODULE__BASE__CORE.
WUFFS_BASE__MAYBE_STATIC size_t  //
wuffs_base__render_number_f64(wuffs_base__slice_u8 dst,
                              double x,
                              uint32_t precision,
                              uint32_t options);

// wuffs_base__render_number_i64 writes the decimal encoding of x to dst and
// returns the number of bytes written. If dst is shorter than the entire
// encoding, it returns 0 (and no bytes are written).
//
// dst will never be too short if its length is at least 20, also known as
// WUFFS_BASE__I64__BYTE_LENGTH__MAX_INCL.
//
// For modular builds that divide the base module into sub-modules, using this
// function requires the WUFFS_CONFIG__MODULE__BASE__INTCONV sub-module, not
// just WUFFS_CONFIG__MODULE__BASE__CORE.
WUFFS_BASE__MAYBE_STATIC size_t  //
wuffs_base__render_number_i64(wuffs_base__slice_u8 dst,
                              int64_t x,
                              uint32_t options);

// wuffs_base__render_number_u64 writes the decimal encoding of x to dst and
// returns the number of bytes written. If dst is shorter than the entire
// encoding, it returns 0 (and no bytes are written).
//
// dst will never be too short if its length is at least 21, also known as
// WUFFS_BASE__U64__BYTE_LENGTH__MAX_INCL.
//
// For modular builds that divide the base module into sub-modules, using this
// function requires the WUFFS_CONFIG__MODULE__BASE__INTCONV sub-module, not
// just WUFFS_CONFIG__MODULE__BASE__CORE.
WUFFS_BASE__MAYBE_STATIC size_t  //
wuffs_base__render_number_u64(wuffs_base__slice_u8 dst,
                              uint64_t x,
                              uint32_t options);

// ---------------- Base-16

// Options (bitwise or'ed together) for wuffs_base__base_16__xxx functions.

#define WUFFS_BASE__BASE_16__DEFAULT_OPTIONS ((uint32_t)0x00000000)

// wuffs_base__base_16__decode2 converts "6A6b" to "jk", where e.g. 'j' is
// U+006A. There are 2 src bytes for every dst byte.
//
// It assumes that the src bytes are two hexadecimal digits (0-9, A-F, a-f),
// repeated. It may write nonsense bytes if not, although it will not read or
// write out of bounds.
//
// For modular builds that divide the base module into sub-modules, using this
// function requires the WUFFS_CONFIG__MODULE__BASE__INTCONV sub-module, not
// just WUFFS_CONFIG__MODULE__BASE__CORE.
WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
wuffs_base__base_16__decode2(wuffs_base__slice_u8 dst,
                             wuffs_base__slice_u8 src,
                             bool src_closed,
                             uint32_t options);

// wuffs_base__base_16__decode4 converts both "\\x6A\\x6b" and "??6a??6B" to
// "jk", where e.g. 'j' is U+006A. There are 4 src bytes for every dst byte.
//
// It assumes that the src bytes are two ignored bytes and then two hexadecimal
// digits (0-9, A-F, a-f), repeated. It may write nonsense bytes if not,
// although it will not read or write out of bounds.
//
// For modular builds that divide the base module into sub-modules, using this
// function requires the WUFFS_CONFIG__MODULE__BASE__INTCONV sub-module, not
// just WUFFS_CONFIG__MODULE__BASE__CORE.
WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
wuffs_base__base_16__decode4(wuffs_base__slice_u8 dst,
                             wuffs_base__slice_u8 src,
                             bool src_closed,
                             uint32_t options);

// wuffs_base__base_16__encode2 converts "jk" to "6A6B", where e.g. 'j' is
// U+006A. There are 2 dst bytes for every src byte.
//
// For modular builds that divide the base module into sub-modules, using this
// function requires the WUFFS_CONFIG__MODULE__BASE__INTCONV sub-module, not
// just WUFFS_CONFIG__MODULE__BASE__CORE.
WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
wuffs_base__base_16__encode2(wuffs_base__slice_u8 dst,
                             wuffs_base__slice_u8 src,
                             bool src_closed,
                             uint32_t options);

// wuffs_base__base_16__encode4 converts "jk" to "\\x6A\\x6B", where e.g. 'j'
// is U+006A. There are 4 dst bytes for every src byte.
//
// For modular builds that divide the base module into sub-modules, using this
// function requires the WUFFS_CONFIG__MODULE__BASE__INTCONV sub-module, not
// just WUFFS_CONFIG__MODULE__BASE__CORE.
WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
wuffs_base__base_16__encode2(wuffs_base__slice_u8 dst,
                             wuffs_base__slice_u8 src,
                             bool src_closed,
                             uint32_t options);

// ---------------- Base-64

// Options (bitwise or'ed together) for wuffs_base__base_64__xxx functions.

#define WUFFS_BASE__BASE_64__DEFAULT_OPTIONS ((uint32_t)0x00000000)

// WUFFS_BASE__BASE_64__DECODE_ALLOW_PADDING means that, when decoding base-64,
// the input may (but does not need to) be padded with '=' bytes so that the
// overall encoded length in bytes is a multiple of 4. A successful decoding
// will return a num_src that includes those padding bytes.
//
// Excess padding (e.g. three final '='s) will be rejected as bad data.
#define WUFFS_BASE__BASE_64__DECODE_ALLOW_PADDING ((uint32_t)0x00000001)

// WUFFS_BASE__BASE_64__ENCODE_EMIT_PADDING means that, when encoding base-64,
// the output will be padded with '=' bytes so that the overall encoded length
// in bytes is a multiple of 4.
#define WUFFS_BASE__BASE_64__ENCODE_EMIT_PADDING ((uint32_t)0x00000002)

// WUFFS_BASE__BASE_64__URL_ALPHABET means that, for base-64, the URL-friendly
// and file-name-friendly alphabet be used, as per RFC 4648 section 5. When
// this option bit is off, the standard alphabet from section 4 is used.
#define WUFFS_BASE__BASE_64__URL_ALPHABET ((uint32_t)0x00000100)

// wuffs_base__base_64__decode transforms base-64 encoded bytes from src to
// arbitrary bytes in dst.
//
// It will not permit line breaks or other whitespace in src. Filtering those
// out is the responsibility of the caller.
//
// For modular builds that divide the base module into sub-modules, using this
// function requires the WUFFS_CONFIG__MODULE__BASE__INTCONV sub-module, not
// just WUFFS_CONFIG__MODULE__BASE__CORE.
WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
wuffs_base__base_64__decode(wuffs_base__slice_u8 dst,
                            wuffs_base__slice_u8 src,
                            bool src_closed,
                            uint32_t options);

// wuffs_base__base_64__encode transforms arbitrary bytes from src to base-64
// encoded bytes in dst.
//
// For modular builds that divide the base module into sub-modules, using this
// function requires the WUFFS_CONFIG__MODULE__BASE__INTCONV sub-module, not
// just WUFFS_CONFIG__MODULE__BASE__CORE.
WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
wuffs_base__base_64__encode(wuffs_base__slice_u8 dst,
                            wuffs_base__slice_u8 src,
                            bool src_closed,
                            uint32_t options);

// ---------------- Unicode and UTF-8

#define WUFFS_BASE__UNICODE_CODE_POINT__MIN_INCL 0x00000000
#define WUFFS_BASE__UNICODE_CODE_POINT__MAX_INCL 0x0010FFFF

#define WUFFS_BASE__UNICODE_REPLACEMENT_CHARACTER 0x0000FFFD

#define WUFFS_BASE__UNICODE_SURROGATE__MIN_INCL 0x0000D800
#define WUFFS_BASE__UNICODE_SURROGATE__MAX_INCL 0x0000DFFF

#define WUFFS_BASE__ASCII__MIN_INCL 0x00
#define WUFFS_BASE__ASCII__MAX_INCL 0x7F

#define WUFFS_BASE__UTF_8__BYTE_LENGTH__MIN_INCL 1
#define WUFFS_BASE__UTF_8__BYTE_LENGTH__MAX_INCL 4

#define WUFFS_BASE__UTF_8__BYTE_LENGTH_1__CODE_POINT__MIN_INCL 0x00000000
#define WUFFS_BASE__UTF_8__BYTE_LENGTH_1__CODE_POINT__MAX_INCL 0x0000007F
#define WUFFS_BASE__UTF_8__BYTE_LENGTH_2__CODE_POINT__MIN_INCL 0x00000080
#define WUFFS_BASE__UTF_8__BYTE_LENGTH_2__CODE_POINT__MAX_INCL 0x000007FF
#define WUFFS_BASE__UTF_8__BYTE_LENGTH_3__CODE_POINT__MIN_INCL 0x00000800
#define WUFFS_BASE__UTF_8__BYTE_LENGTH_3__CODE_POINT__MAX_INCL 0x0000FFFF
#define WUFFS_BASE__UTF_8__BYTE_LENGTH_4__CODE_POINT__MIN_INCL 0x00010000
#define WUFFS_BASE__UTF_8__BYTE_LENGTH_4__CODE_POINT__MAX_INCL 0x0010FFFF

// --------

// wuffs_base__utf_8__next__output is the type returned by
// wuffs_base__utf_8__next.
typedef struct wuffs_base__utf_8__next__output__struct {
  uint32_t code_point;
  uint32_t byte_length;

#ifdef __cplusplus
  inline bool is_valid() const;
#endif  // __cplusplus

} wuffs_base__utf_8__next__output;

static inline wuffs_base__utf_8__next__output  //
wuffs_base__make_utf_8__next__output(uint32_t code_point,
                                     uint32_t byte_length) {
  wuffs_base__utf_8__next__output ret;
  ret.code_point = code_point;
  ret.byte_length = byte_length;
  return ret;
}

static inline bool  //
wuffs_base__utf_8__next__output__is_valid(
    const wuffs_base__utf_8__next__output* o) {
  if (o) {
    uint32_t cp = o->code_point;
    switch (o->byte_length) {
      case 1:
        return (cp <= 0x7F);
      case 2:
        return (0x080 <= cp) && (cp <= 0x7FF);
      case 3:
        // Avoid the 0xD800 ..= 0xDFFF surrogate range.
        return ((0x0800 <= cp) && (cp <= 0xD7FF)) ||
               ((0xE000 <= cp) && (cp <= 0xFFFF));
      case 4:
        return (0x00010000 <= cp) && (cp <= 0x0010FFFF);
    }
  }
  return false;
}

#ifdef __cplusplus

inline bool  //
wuffs_base__utf_8__next__output::is_valid() const {
  return wuffs_base__utf_8__next__output__is_valid(this);
}

#endif  // __cplusplus

// --------

// wuffs_base__utf_8__encode writes the UTF-8 encoding of code_point to s and
// returns the number of bytes written. If code_point is invalid, or if s is
// shorter than the entire encoding, it returns 0 (and no bytes are written).
//
// s will never be too short if its length is at least 4, also known as
// WUFFS_BASE__UTF_8__BYTE_LENGTH__MAX_INCL.
//
// For modular builds that divide the base module into sub-modules, using this
// function requires the WUFFS_CONFIG__MODULE__BASE__UTF8 sub-module, not just
// WUFFS_CONFIG__MODULE__BASE__CORE.
WUFFS_BASE__MAYBE_STATIC size_t  //
wuffs_base__utf_8__encode(wuffs_base__slice_u8 dst, uint32_t code_point);

// wuffs_base__utf_8__next returns the next UTF-8 code point (and that code
// point's byte length) at the start of the read-only slice (s_ptr, s_len).
//
// There are exactly two cases in which this function returns something where
// wuffs_base__utf_8__next__output__is_valid is false:
//  - If s is empty then it returns {.code_point=0, .byte_length=0}.
//  - If s is non-empty and starts with invalid UTF-8 then it returns
//    {.code_point=WUFFS_BASE__UNICODE_REPLACEMENT_CHARACTER, .byte_length=1}.
//
// Otherwise, it returns something where
// wuffs_base__utf_8__next__output__is_valid is true.
//
// In any case, it always returns an output that satisfies both of:
//  - (output.code_point  <= WUFFS_BASE__UNICODE_CODE_POINT__MAX_INCL).
//  - (output.byte_length <= s_len).
//
// If s is a sub-slice of a larger slice of valid UTF-8, but that sub-slice
// boundary occurs in the middle of a multi-byte UTF-8 encoding of a single
// code point, then this function may return something invalid. It is the
// caller's responsibility to split on or otherwise manage UTF-8 boundaries.
//
// For modular builds that divide the base module into sub-modules, using this
// function requires the WUFFS_CONFIG__MODULE__BASE__UTF8 sub-module, not just
// WUFFS_CONFIG__MODULE__BASE__CORE.
WUFFS_BASE__MAYBE_STATIC wuffs_base__utf_8__next__output  //
wuffs_base__utf_8__next(const uint8_t* s_ptr, size_t s_len);

// wuffs_base__utf_8__next_from_end is like wuffs_base__utf_8__next except that
// it looks at the end of (s_ptr, s_len) instead of the start.
//
// For modular builds that divide the base module into sub-modules, using this
// function requires the WUFFS_CONFIG__MODULE__BASE__UTF8 sub-module, not just
// WUFFS_CONFIG__MODULE__BASE__CORE.
WUFFS_BASE__MAYBE_STATIC wuffs_base__utf_8__next__output  //
wuffs_base__utf_8__next_from_end(const uint8_t* s_ptr, size_t s_len);

// wuffs_base__utf_8__longest_valid_prefix returns the largest n such that the
// sub-slice s[..n] is valid UTF-8, where s is the read-only slice (s_ptr,
// s_len).
//
// In particular, it returns s_len if and only if all of s is valid UTF-8.
//
// If s is a sub-slice of a larger slice of valid UTF-8, but that sub-slice
// boundary occurs in the middle of a multi-byte UTF-8 encoding of a single
// code point, then this function will return less than s_len. It is the
// caller's responsibility to split on or otherwise manage UTF-8 boundaries.
//
// For modular builds that divide the base module into sub-modules, using this
// function requires the WUFFS_CONFIG__MODULE__BASE__UTF8 sub-module, not just
// WUFFS_CONFIG__MODULE__BASE__CORE.
WUFFS_BASE__MAYBE_STATIC size_t  //
wuffs_base__utf_8__longest_valid_prefix(const uint8_t* s_ptr, size_t s_len);

// wuffs_base__ascii__longest_valid_prefix returns the largest n such that the
// sub-slice s[..n] is valid ASCII, where s is the read-only slice (s_ptr,
// s_len).
//
// In particular, it returns s_len if and only if all of s is valid ASCII.
// Equivalently, when none of the bytes in s have the 0x80 high bit set.
//
// For modular builds that divide the base module into sub-modules, using this
// function requires the WUFFS_CONFIG__MODULE__BASE__UTF8 sub-module, not just
// WUFFS_CONFIG__MODULE__BASE__CORE.
WUFFS_BASE__MAYBE_STATIC size_t  //
wuffs_base__ascii__longest_valid_prefix(const uint8_t* s_ptr, size_t s_len);

// ---------------- Interface Declarations.

// For modular builds that divide the base module into sub-modules, using these
// functions require the WUFFS_CONFIG__MODULE__BASE__INTERFACES sub-module, not
// just WUFFS_CONFIG__MODULE__BASE__CORE.

// --------

extern const char wuffs_base__hasher_u32__vtable_name[];

typedef struct wuffs_base__hasher_u32__func_ptrs__struct {
  wuffs_base__empty_struct (*set_quirk_enabled)(
    void* self,
    uint32_t a_quirk,
    bool a_enabled);
  uint32_t (*update_u32)(
    void* self,
    wuffs_base__slice_u8 a_x);
} wuffs_base__hasher_u32__func_ptrs;

typedef struct wuffs_base__hasher_u32__struct wuffs_base__hasher_u32;

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_base__hasher_u32__set_quirk_enabled(
    wuffs_base__hasher_u32* self,
    uint32_t a_quirk,
    bool a_enabled);

WUFFS_BASE__MAYBE_STATIC uint32_t
wuffs_base__hasher_u32__update_u32(
    wuffs_base__hasher_u32* self,
    wuffs_base__slice_u8 a_x);

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_base__hasher_u32__struct {
  struct {
    uint32_t magic;
    uint32_t active_coroutine;
    wuffs_base__vtable first_vtable;
  } private_impl;

#ifdef __cplusplus
#if (__cplusplus >= 201103L)
  using unique_ptr = std::unique_ptr<wuffs_base__hasher_u32, decltype(&free)>;
#endif

  inline wuffs_base__empty_struct
  set_quirk_enabled(
      uint32_t a_quirk,
      bool a_enabled) {
    return wuffs_base__hasher_u32__set_quirk_enabled(
        this, a_quirk, a_enabled);
  }

  inline uint32_t
  update_u32(
      wuffs_base__slice_u8 a_x) {
    return wuffs_base__hasher_u32__update_u32(
        this, a_x);
  }

#endif  // __cplusplus
};  // struct wuffs_base__hasher_u32__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

// --------

extern const char wuffs_base__image_decoder__vtable_name[];

typedef struct wuffs_base__image_decoder__func_ptrs__struct {
  wuffs_base__status (*decode_frame)(
    void* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__pixel_blend a_blend,
    wuffs_base__slice_u8 a_workbuf,
    wuffs_base__decode_frame_options* a_opts);
  wuffs_base__status (*decode_frame_config)(
    void* self,
    wuffs_base__frame_config* a_dst,
    wuffs_base__io_buffer* a_src);
  wuffs_base__status (*decode_image_config)(
    void* self,
    wuffs_base__image_config* a_dst,
    wuffs_base__io_buffer* a_src);
  wuffs_base__rect_ie_u32 (*frame_dirty_rect)(
    const void* self);
  uint32_t (*num_animation_loops)(
    const void* self);
  uint64_t (*num_decoded_frame_configs)(
    const void* self);
  uint64_t (*num_decoded_frames)(
    const void* self);
  wuffs_base__status (*restart_frame)(
    void* self,
    uint64_t a_index,
    uint64_t a_io_position);
  wuffs_base__empty_struct (*set_quirk_enabled)(
    void* self,
    uint32_t a_quirk,
    bool a_enabled);
  wuffs_base__empty_struct (*set_report_metadata)(
    void* self,
    uint32_t a_fourcc,
    bool a_report);
  wuffs_base__status (*tell_me_more)(
    void* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__more_information* a_minfo,
    wuffs_base__io_buffer* a_src);
  wuffs_base__range_ii_u64 (*workbuf_len)(
    const void* self);
} wuffs_base__image_decoder__func_ptrs;

typedef struct wuffs_base__image_decoder__struct wuffs_base__image_decoder;

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_base__image_decoder__decode_frame(
    wuffs_base__image_decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__pixel_blend a_blend,
    wuffs_base__slice_u8 a_workbuf,
    wuffs_base__decode_frame_options* a_opts);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_base__image_decoder__decode_frame_config(
    wuffs_base__image_decoder* self,
    wuffs_base__frame_config* a_dst,
    wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_base__image_decoder__decode_image_config(
    wuffs_base__image_decoder* self,
    wuffs_base__image_config* a_dst,
    wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
wuffs_base__image_decoder__frame_dirty_rect(
    const wuffs_base__image_decoder* self);

WUFFS_BASE__MAYBE_STATIC uint32_t
wuffs_base__image_decoder__num_animation_loops(
    const wuffs_base__image_decoder* self);

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_base__image_decoder__num_decoded_frame_configs(
    const wuffs_base__image_decoder* self);

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_base__image_decoder__num_decoded_frames(
    const wuffs_base__image_decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_base__image_decoder__restart_frame(
    wuffs_base__image_decoder* self,
    uint64_t a_index,
    uint64_t a_io_position);

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_base__image_decoder__set_quirk_enabled(
    wuffs_base__image_decoder* self,
    uint32_t a_quirk,
    bool a_enabled);

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_base__image_decoder__set_report_metadata(
    wuffs_base__image_decoder* self,
    uint32_t a_fourcc,
    bool a_report);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_base__image_decoder__tell_me_more(
    wuffs_base__image_decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__more_information* a_minfo,
    wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_base__image_decoder__workbuf_len(
    const wuffs_base__image_decoder* self);

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_base__image_decoder__struct {
  struct {
    uint32_t magic;
    uint32_t active_coroutine;
    wuffs_base__vtable first_vtable;
  } private_impl;

#ifdef __cplusplus
#if (__cplusplus >= 201103L)
  using unique_ptr = std::unique_ptr<wuffs_base__image_decoder, decltype(&free)>;
#endif

  inline wuffs_base__status
  decode_frame(
      wuffs_base__pixel_buffer* a_dst,
      wuffs_base__io_buffer* a_src,
      wuffs_base__pixel_blend a_blend,
      wuffs_base__slice_u8 a_workbuf,
      wuffs_base__decode_frame_options* a_opts) {
    return wuffs_base__image_decoder__decode_frame(
        this, a_dst, a_src, a_blend, a_workbuf, a_opts);
  }

  inline wuffs_base__status
  decode_frame_config(
      wuffs_base__frame_config* a_dst,
      wuffs_base__io_buffer* a_src) {
    return wuffs_base__image_decoder__decode_frame_config(
        this, a_dst, a_src);
  }

  inline wuffs_base__status
  decode_image_config(
      wuffs_base__image_config* a_dst,
      wuffs_base__io_buffer* a_src) {
    return wuffs_base__image_decoder__decode_image_config(
        this, a_dst, a_src);
  }

  inline wuffs_base__rect_ie_u32
  frame_dirty_rect() const {
    return wuffs_base__image_decoder__frame_dirty_rect(this);
  }

  inline uint32_t
  num_animation_loops() const {
    return wuffs_base__image_decoder__num_animation_loops(this);
  }

  inline uint64_t
  num_decoded_frame_configs() const {
    return wuffs_base__image_decoder__num_decoded_frame_configs(this);
  }

  inline uint64_t
  num_decoded_frames() const {
    return wuffs_base__image_decoder__num_decoded_frames(this);
  }

  inline wuffs_base__status
  restart_frame(
      uint64_t a_index,
      uint64_t a_io_position) {
    return wuffs_base__image_decoder__restart_frame(
        this, a_index, a_io_position);
  }

  inline wuffs_base__empty_struct
  set_quirk_enabled(
      uint32_t a_quirk,
      bool a_enabled) {
    return wuffs_base__image_decoder__set_quirk_enabled(
        this, a_quirk, a_enabled);
  }

  inline wuffs_base__empty_struct
  set_report_metadata(
      uint32_t a_fourcc,
      bool a_report) {
    return wuffs_base__image_decoder__set_report_metadata(
        this, a_fourcc, a_report);
  }

  inline wuffs_base__status
  tell_me_more(
      wuffs_base__io_buffer* a_dst,
      wuffs_base__more_information* a_minfo,
      wuffs_base__io_buffer* a_src) {
    return wuffs_base__image_decoder__tell_me_more(
        this, a_dst, a_minfo, a_src);
  }

  inline wuffs_base__range_ii_u64
  workbuf_len() const {
    return wuffs_base__image_decoder__workbuf_len(this);
  }

#endif  // __cplusplus
};  // struct wuffs_base__image_decoder__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

// --------

extern const char wuffs_base__io_transformer__vtable_name[];

typedef struct wuffs_base__io_transformer__func_ptrs__struct {
  wuffs_base__empty_struct (*set_quirk_enabled)(
    void* self,
    uint32_t a_quirk,
    bool a_enabled);
  wuffs_base__status (*transform_io)(
    void* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__slice_u8 a_workbuf);
  wuffs_base__range_ii_u64 (*workbuf_len)(
    const void* self);
} wuffs_base__io_transformer__func_ptrs;

typedef struct wuffs_base__io_transformer__struct wuffs_base__io_transformer;

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_base__io_transformer__set_quirk_enabled(
    wuffs_base__io_transformer* self,
    uint32_t a_quirk,
    bool a_enabled);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_base__io_transformer__transform_io(
    wuffs_base__io_transformer* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__slice_u8 a_workbuf);

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_base__io_transformer__workbuf_len(
    const wuffs_base__io_transformer* self);

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_base__io_transformer__struct {
  struct {
    uint32_t magic;
    uint32_t active_coroutine;
    wuffs_base__vtable first_vtable;
  } private_impl;

#ifdef __cplusplus
#if (__cplusplus >= 201103L)
  using unique_ptr = std::unique_ptr<wuffs_base__io_transformer, decltype(&free)>;
#endif

  inline wuffs_base__empty_struct
  set_quirk_enabled(
      uint32_t a_quirk,
      bool a_enabled) {
    return wuffs_base__io_transformer__set_quirk_enabled(
        this, a_quirk, a_enabled);
  }

  inline wuffs_base__status
  transform_io(
      wuffs_base__io_buffer* a_dst,
      wuffs_base__io_buffer* a_src,
      wuffs_base__slice_u8 a_workbuf) {
    return wuffs_base__io_transformer__transform_io(
        this, a_dst, a_src, a_workbuf);
  }

  inline wuffs_base__range_ii_u64
  workbuf_len() const {
    return wuffs_base__io_transformer__workbuf_len(this);
  }

#endif  // __cplusplus
};  // struct wuffs_base__io_transformer__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

// --------

extern const char wuffs_base__token_decoder__vtable_name[];

typedef struct wuffs_base__token_decoder__func_ptrs__struct {
  wuffs_base__status (*decode_tokens)(
    void* self,
    wuffs_base__token_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__slice_u8 a_workbuf);
  wuffs_base__empty_struct (*set_quirk_enabled)(
    void* self,
    uint32_t a_quirk,
    bool a_enabled);
  wuffs_base__range_ii_u64 (*workbuf_len)(
    const void* self);
} wuffs_base__token_decoder__func_ptrs;

typedef struct wuffs_base__token_decoder__struct wuffs_base__token_decoder;

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_base__token_decoder__decode_tokens(
    wuffs_base__token_decoder* self,
    wuffs_base__token_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__slice_u8 a_workbuf);

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_base__token_decoder__set_quirk_enabled(
    wuffs_base__token_decoder* self,
    uint32_t a_quirk,
    bool a_enabled);

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_base__token_decoder__workbuf_len(
    const wuffs_base__token_decoder* self);

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_base__token_decoder__struct {
  struct {
    uint32_t magic;
    uint32_t active_coroutine;
    wuffs_base__vtable first_vtable;
  } private_impl;

#ifdef __cplusplus
#if (__cplusplus >= 201103L)
  using unique_ptr = std::unique_ptr<wuffs_base__token_decoder, decltype(&free)>;
#endif

  inline wuffs_base__status
  decode_tokens(
      wuffs_base__token_buffer* a_dst,
      wuffs_base__io_buffer* a_src,
      wuffs_base__slice_u8 a_workbuf) {
    return wuffs_base__token_decoder__decode_tokens(
        this, a_dst, a_src, a_workbuf);
  }

  inline wuffs_base__empty_struct
  set_quirk_enabled(
      uint32_t a_quirk,
      bool a_enabled) {
    return wuffs_base__token_decoder__set_quirk_enabled(
        this, a_quirk, a_enabled);
  }

  inline wuffs_base__range_ii_u64
  workbuf_len() const {
    return wuffs_base__token_decoder__workbuf_len(this);
  }

#endif  // __cplusplus
};  // struct wuffs_base__token_decoder__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

// ----------------

#ifdef __cplusplus
}  // extern "C"
#endif

#ifdef __cplusplus
extern "C" {
#endif

// ---------------- Status Codes

// ---------------- Public Consts

// ---------------- Struct Declarations

typedef struct wuffs_adler32__hasher__struct wuffs_adler32__hasher;

// ---------------- Public Initializer Prototypes

// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
//
// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_adler32__hasher__initialize(
    wuffs_adler32__hasher* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options);

size_t
sizeof__wuffs_adler32__hasher();

// ---------------- Allocs

// These functions allocate and initialize Wuffs structs. They return NULL if
// memory allocation fails. If they return non-NULL, there is no need to call
// wuffs_foo__bar__initialize, but the caller is responsible for eventually
// calling free on the returned pointer. That pointer is effectively a C++
// std::unique_ptr<T, decltype(&free)>.

wuffs_adler32__hasher*
wuffs_adler32__hasher__alloc();

static inline wuffs_base__hasher_u32*
wuffs_adler32__hasher__alloc_as__wuffs_base__hasher_u32() {
  return (wuffs_base__hasher_u32*)(wuffs_adler32__hasher__alloc());
}

// ---------------- Upcasts

static inline wuffs_base__hasher_u32*
wuffs_adler32__hasher__upcast_as__wuffs_base__hasher_u32(
    wuffs_adler32__hasher* p) {
  return (wuffs_base__hasher_u32*)p;
}

// ---------------- Public Function Prototypes

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_adler32__hasher__set_quirk_enabled(
    wuffs_adler32__hasher* self,
    uint32_t a_quirk,
    bool a_enabled);

WUFFS_BASE__MAYBE_STATIC uint32_t
wuffs_adler32__hasher__update_u32(
    wuffs_adler32__hasher* self,
    wuffs_base__slice_u8 a_x);

// ---------------- Struct Definitions

// These structs' fields, and the sizeof them, are private implementation
// details that aren't guaranteed to be stable across Wuffs versions.
//
// See https://en.wikipedia.org/wiki/Opaque_pointer#C

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_adler32__hasher__struct {
  // Do not access the private_impl's or private_data's fields directly. There
  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
  // the wuffs_foo__bar__baz functions.
  //
  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.

  struct {
    uint32_t magic;
    uint32_t active_coroutine;
    wuffs_base__vtable vtable_for__wuffs_base__hasher_u32;
    wuffs_base__vtable null_vtable;

    uint32_t f_state;
    bool f_started;

    wuffs_base__empty_struct (*choosy_up)(
        wuffs_adler32__hasher* self,
        wuffs_base__slice_u8 a_x);
  } private_impl;

#ifdef __cplusplus
#if (__cplusplus >= 201103L)
  using unique_ptr = std::unique_ptr<wuffs_adler32__hasher, decltype(&free)>;

  // On failure, the alloc_etc functions return nullptr. They don't throw.

  static inline unique_ptr
  alloc() {
    return unique_ptr(wuffs_adler32__hasher__alloc(), &free);
  }

  static inline wuffs_base__hasher_u32::unique_ptr
  alloc_as__wuffs_base__hasher_u32() {
    return wuffs_base__hasher_u32::unique_ptr(
        wuffs_adler32__hasher__alloc_as__wuffs_base__hasher_u32(), &free);
  }
#endif  // (__cplusplus >= 201103L)

#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
  // Disallow constructing or copying an object via standard C++ mechanisms,
  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
  // size and field layout is not part of the public, stable, memory-safe API.
  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
  // their first argument) rather than tweaking bar.private_impl.qux fields.
  //
  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
  // order to provide convenience methods. These forward on "this", so that you
  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
  wuffs_adler32__hasher__struct() = delete;
  wuffs_adler32__hasher__struct(const wuffs_adler32__hasher__struct&) = delete;
  wuffs_adler32__hasher__struct& operator=(
      const wuffs_adler32__hasher__struct&) = delete;

  // As above, the size of the struct is not part of the public API, and unless
  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
  // allocated, not stack allocated. Its size is not intended to be known at
  // compile time, but it is unfortunately divulged as a side effect of
  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
  // instead of "sizeof T", invoking the operator. To make the two values
  // different, so that passing the latter will be rejected by the initialize
  // function, we add an arbitrary amount of dead weight.
  uint8_t dead_weight[123000000];  // 123 MB.
#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)

  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
  initialize(
      size_t sizeof_star_self,
      uint64_t wuffs_version,
      uint32_t options) {
    return wuffs_adler32__hasher__initialize(
        this, sizeof_star_self, wuffs_version, options);
  }

  inline wuffs_base__hasher_u32*
  upcast_as__wuffs_base__hasher_u32() {
    return (wuffs_base__hasher_u32*)this;
  }

  inline wuffs_base__empty_struct
  set_quirk_enabled(
      uint32_t a_quirk,
      bool a_enabled) {
    return wuffs_adler32__hasher__set_quirk_enabled(this, a_quirk, a_enabled);
  }

  inline uint32_t
  update_u32(
      wuffs_base__slice_u8 a_x) {
    return wuffs_adler32__hasher__update_u32(this, a_x);
  }

#endif  // __cplusplus
};  // struct wuffs_adler32__hasher__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

#ifdef __cplusplus
}  // extern "C"
#endif

#ifdef __cplusplus
extern "C" {
#endif

// ---------------- Status Codes

extern const char wuffs_bmp__error__bad_header[];
extern const char wuffs_bmp__error__bad_rle_compression[];
extern const char wuffs_bmp__error__unsupported_bmp_file[];

// ---------------- Public Consts

#define WUFFS_BMP__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 0

// ---------------- Struct Declarations

typedef struct wuffs_bmp__decoder__struct wuffs_bmp__decoder;

// ---------------- Public Initializer Prototypes

// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
//
// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_bmp__decoder__initialize(
    wuffs_bmp__decoder* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options);

size_t
sizeof__wuffs_bmp__decoder();

// ---------------- Allocs

// These functions allocate and initialize Wuffs structs. They return NULL if
// memory allocation fails. If they return non-NULL, there is no need to call
// wuffs_foo__bar__initialize, but the caller is responsible for eventually
// calling free on the returned pointer. That pointer is effectively a C++
// std::unique_ptr<T, decltype(&free)>.

wuffs_bmp__decoder*
wuffs_bmp__decoder__alloc();

static inline wuffs_base__image_decoder*
wuffs_bmp__decoder__alloc_as__wuffs_base__image_decoder() {
  return (wuffs_base__image_decoder*)(wuffs_bmp__decoder__alloc());
}

// ---------------- Upcasts

static inline wuffs_base__image_decoder*
wuffs_bmp__decoder__upcast_as__wuffs_base__image_decoder(
    wuffs_bmp__decoder* p) {
  return (wuffs_base__image_decoder*)p;
}

// ---------------- Public Function Prototypes

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_bmp__decoder__set_quirk_enabled(
    wuffs_bmp__decoder* self,
    uint32_t a_quirk,
    bool a_enabled);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_bmp__decoder__decode_image_config(
    wuffs_bmp__decoder* self,
    wuffs_base__image_config* a_dst,
    wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_bmp__decoder__decode_frame_config(
    wuffs_bmp__decoder* self,
    wuffs_base__frame_config* a_dst,
    wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_bmp__decoder__decode_frame(
    wuffs_bmp__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__pixel_blend a_blend,
    wuffs_base__slice_u8 a_workbuf,
    wuffs_base__decode_frame_options* a_opts);

WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
wuffs_bmp__decoder__frame_dirty_rect(
    const wuffs_bmp__decoder* self);

WUFFS_BASE__MAYBE_STATIC uint32_t
wuffs_bmp__decoder__num_animation_loops(
    const wuffs_bmp__decoder* self);

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_bmp__decoder__num_decoded_frame_configs(
    const wuffs_bmp__decoder* self);

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_bmp__decoder__num_decoded_frames(
    const wuffs_bmp__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_bmp__decoder__restart_frame(
    wuffs_bmp__decoder* self,
    uint64_t a_index,
    uint64_t a_io_position);

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_bmp__decoder__set_report_metadata(
    wuffs_bmp__decoder* self,
    uint32_t a_fourcc,
    bool a_report);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_bmp__decoder__tell_me_more(
    wuffs_bmp__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__more_information* a_minfo,
    wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_bmp__decoder__workbuf_len(
    const wuffs_bmp__decoder* self);

// ---------------- Struct Definitions

// These structs' fields, and the sizeof them, are private implementation
// details that aren't guaranteed to be stable across Wuffs versions.
//
// See https://en.wikipedia.org/wiki/Opaque_pointer#C

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_bmp__decoder__struct {
  // Do not access the private_impl's or private_data's fields directly. There
  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
  // the wuffs_foo__bar__baz functions.
  //
  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.

  struct {
    uint32_t magic;
    uint32_t active_coroutine;
    wuffs_base__vtable vtable_for__wuffs_base__image_decoder;
    wuffs_base__vtable null_vtable;

    uint32_t f_width;
    uint32_t f_height;
    uint8_t f_call_sequence;
    bool f_top_down;
    uint32_t f_pad_per_row;
    uint32_t f_src_pixfmt;
    uint32_t f_io_redirect_fourcc;
    uint64_t f_io_redirect_pos;
    uint64_t f_frame_config_io_position;
    uint32_t f_bitmap_info_len;
    uint32_t f_padding;
    uint32_t f_bits_per_pixel;
    uint32_t f_compression;
    uint32_t f_channel_masks[4];
    uint8_t f_channel_shifts[4];
    uint8_t f_channel_num_bits[4];
    uint32_t f_dst_x;
    uint32_t f_dst_y;
    uint32_t f_dst_y_inc;
    uint32_t f_pending_pad;
    uint32_t f_rle_state;
    uint32_t f_rle_length;
    uint8_t f_rle_delta_x;
    bool f_rle_padded;
    wuffs_base__pixel_swizzler f_swizzler;

    uint32_t p_decode_image_config[1];
    uint32_t p_decode_frame_config[1];
    uint32_t p_decode_frame[1];
    uint32_t p_read_palette[1];
  } private_impl;

  struct {
    uint8_t f_scratch[2048];
    uint8_t f_src_palette[1024];

    struct {
      uint64_t scratch;
    } s_decode_image_config[1];
    struct {
      wuffs_base__status v_status;
      uint64_t scratch;
    } s_decode_frame[1];
    struct {
      uint32_t v_i;
      uint64_t scratch;
    } s_read_palette[1];
  } private_data;

#ifdef __cplusplus
#if (__cplusplus >= 201103L)
  using unique_ptr = std::unique_ptr<wuffs_bmp__decoder, decltype(&free)>;

  // On failure, the alloc_etc functions return nullptr. They don't throw.

  static inline unique_ptr
  alloc() {
    return unique_ptr(wuffs_bmp__decoder__alloc(), &free);
  }

  static inline wuffs_base__image_decoder::unique_ptr
  alloc_as__wuffs_base__image_decoder() {
    return wuffs_base__image_decoder::unique_ptr(
        wuffs_bmp__decoder__alloc_as__wuffs_base__image_decoder(), &free);
  }
#endif  // (__cplusplus >= 201103L)

#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
  // Disallow constructing or copying an object via standard C++ mechanisms,
  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
  // size and field layout is not part of the public, stable, memory-safe API.
  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
  // their first argument) rather than tweaking bar.private_impl.qux fields.
  //
  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
  // order to provide convenience methods. These forward on "this", so that you
  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
  wuffs_bmp__decoder__struct() = delete;
  wuffs_bmp__decoder__struct(const wuffs_bmp__decoder__struct&) = delete;
  wuffs_bmp__decoder__struct& operator=(
      const wuffs_bmp__decoder__struct&) = delete;

  // As above, the size of the struct is not part of the public API, and unless
  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
  // allocated, not stack allocated. Its size is not intended to be known at
  // compile time, but it is unfortunately divulged as a side effect of
  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
  // instead of "sizeof T", invoking the operator. To make the two values
  // different, so that passing the latter will be rejected by the initialize
  // function, we add an arbitrary amount of dead weight.
  uint8_t dead_weight[123000000];  // 123 MB.
#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)

  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
  initialize(
      size_t sizeof_star_self,
      uint64_t wuffs_version,
      uint32_t options) {
    return wuffs_bmp__decoder__initialize(
        this, sizeof_star_self, wuffs_version, options);
  }

  inline wuffs_base__image_decoder*
  upcast_as__wuffs_base__image_decoder() {
    return (wuffs_base__image_decoder*)this;
  }

  inline wuffs_base__empty_struct
  set_quirk_enabled(
      uint32_t a_quirk,
      bool a_enabled) {
    return wuffs_bmp__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
  }

  inline wuffs_base__status
  decode_image_config(
      wuffs_base__image_config* a_dst,
      wuffs_base__io_buffer* a_src) {
    return wuffs_bmp__decoder__decode_image_config(this, a_dst, a_src);
  }

  inline wuffs_base__status
  decode_frame_config(
      wuffs_base__frame_config* a_dst,
      wuffs_base__io_buffer* a_src) {
    return wuffs_bmp__decoder__decode_frame_config(this, a_dst, a_src);
  }

  inline wuffs_base__status
  decode_frame(
      wuffs_base__pixel_buffer* a_dst,
      wuffs_base__io_buffer* a_src,
      wuffs_base__pixel_blend a_blend,
      wuffs_base__slice_u8 a_workbuf,
      wuffs_base__decode_frame_options* a_opts) {
    return wuffs_bmp__decoder__decode_frame(this, a_dst, a_src, a_blend, a_workbuf, a_opts);
  }

  inline wuffs_base__rect_ie_u32
  frame_dirty_rect() const {
    return wuffs_bmp__decoder__frame_dirty_rect(this);
  }

  inline uint32_t
  num_animation_loops() const {
    return wuffs_bmp__decoder__num_animation_loops(this);
  }

  inline uint64_t
  num_decoded_frame_configs() const {
    return wuffs_bmp__decoder__num_decoded_frame_configs(this);
  }

  inline uint64_t
  num_decoded_frames() const {
    return wuffs_bmp__decoder__num_decoded_frames(this);
  }

  inline wuffs_base__status
  restart_frame(
      uint64_t a_index,
      uint64_t a_io_position) {
    return wuffs_bmp__decoder__restart_frame(this, a_index, a_io_position);
  }

  inline wuffs_base__empty_struct
  set_report_metadata(
      uint32_t a_fourcc,
      bool a_report) {
    return wuffs_bmp__decoder__set_report_metadata(this, a_fourcc, a_report);
  }

  inline wuffs_base__status
  tell_me_more(
      wuffs_base__io_buffer* a_dst,
      wuffs_base__more_information* a_minfo,
      wuffs_base__io_buffer* a_src) {
    return wuffs_bmp__decoder__tell_me_more(this, a_dst, a_minfo, a_src);
  }

  inline wuffs_base__range_ii_u64
  workbuf_len() const {
    return wuffs_bmp__decoder__workbuf_len(this);
  }

#endif  // __cplusplus
};  // struct wuffs_bmp__decoder__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

#ifdef __cplusplus
}  // extern "C"
#endif

#ifdef __cplusplus
extern "C" {
#endif

// ---------------- Status Codes

extern const char wuffs_cbor__error__bad_input[];
extern const char wuffs_cbor__error__unsupported_recursion_depth[];

// ---------------- Public Consts

#define WUFFS_CBOR__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 0

#define WUFFS_CBOR__DECODER_DEPTH_MAX_INCL 1024

#define WUFFS_CBOR__DECODER_DST_TOKEN_BUFFER_LENGTH_MIN_INCL 2

#define WUFFS_CBOR__DECODER_SRC_IO_BUFFER_LENGTH_MIN_INCL 9

#define WUFFS_CBOR__TOKEN_VALUE_MAJOR 787997

#define WUFFS_CBOR__TOKEN_VALUE_MINOR__DETAIL_MASK 262143

#define WUFFS_CBOR__TOKEN_VALUE_MINOR__MINUS_1_MINUS_X 16777216

#define WUFFS_CBOR__TOKEN_VALUE_MINOR__SIMPLE_VALUE 8388608

#define WUFFS_CBOR__TOKEN_VALUE_MINOR__TAG 4194304

// ---------------- Struct Declarations

typedef struct wuffs_cbor__decoder__struct wuffs_cbor__decoder;

// ---------------- Public Initializer Prototypes

// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
//
// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_cbor__decoder__initialize(
    wuffs_cbor__decoder* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options);

size_t
sizeof__wuffs_cbor__decoder();

// ---------------- Allocs

// These functions allocate and initialize Wuffs structs. They return NULL if
// memory allocation fails. If they return non-NULL, there is no need to call
// wuffs_foo__bar__initialize, but the caller is responsible for eventually
// calling free on the returned pointer. That pointer is effectively a C++
// std::unique_ptr<T, decltype(&free)>.

wuffs_cbor__decoder*
wuffs_cbor__decoder__alloc();

static inline wuffs_base__token_decoder*
wuffs_cbor__decoder__alloc_as__wuffs_base__token_decoder() {
  return (wuffs_base__token_decoder*)(wuffs_cbor__decoder__alloc());
}

// ---------------- Upcasts

static inline wuffs_base__token_decoder*
wuffs_cbor__decoder__upcast_as__wuffs_base__token_decoder(
    wuffs_cbor__decoder* p) {
  return (wuffs_base__token_decoder*)p;
}

// ---------------- Public Function Prototypes

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_cbor__decoder__set_quirk_enabled(
    wuffs_cbor__decoder* self,
    uint32_t a_quirk,
    bool a_enabled);

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_cbor__decoder__workbuf_len(
    const wuffs_cbor__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_cbor__decoder__decode_tokens(
    wuffs_cbor__decoder* self,
    wuffs_base__token_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__slice_u8 a_workbuf);

// ---------------- Struct Definitions

// These structs' fields, and the sizeof them, are private implementation
// details that aren't guaranteed to be stable across Wuffs versions.
//
// See https://en.wikipedia.org/wiki/Opaque_pointer#C

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_cbor__decoder__struct {
  // Do not access the private_impl's or private_data's fields directly. There
  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
  // the wuffs_foo__bar__baz functions.
  //
  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.

  struct {
    uint32_t magic;
    uint32_t active_coroutine;
    wuffs_base__vtable vtable_for__wuffs_base__token_decoder;
    wuffs_base__vtable null_vtable;

    bool f_end_of_data;

    uint32_t p_decode_tokens[1];
  } private_impl;

  struct {
    uint32_t f_stack[64];
    uint64_t f_container_num_remaining[1024];

    struct {
      uint64_t v_string_length;
      uint32_t v_depth;
      uint32_t v_token_length;
      bool v_tagged;
      uint8_t v_indefinite_string_major_type;
    } s_decode_tokens[1];
  } private_data;

#ifdef __cplusplus
#if (__cplusplus >= 201103L)
  using unique_ptr = std::unique_ptr<wuffs_cbor__decoder, decltype(&free)>;

  // On failure, the alloc_etc functions return nullptr. They don't throw.

  static inline unique_ptr
  alloc() {
    return unique_ptr(wuffs_cbor__decoder__alloc(), &free);
  }

  static inline wuffs_base__token_decoder::unique_ptr
  alloc_as__wuffs_base__token_decoder() {
    return wuffs_base__token_decoder::unique_ptr(
        wuffs_cbor__decoder__alloc_as__wuffs_base__token_decoder(), &free);
  }
#endif  // (__cplusplus >= 201103L)

#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
  // Disallow constructing or copying an object via standard C++ mechanisms,
  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
  // size and field layout is not part of the public, stable, memory-safe API.
  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
  // their first argument) rather than tweaking bar.private_impl.qux fields.
  //
  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
  // order to provide convenience methods. These forward on "this", so that you
  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
  wuffs_cbor__decoder__struct() = delete;
  wuffs_cbor__decoder__struct(const wuffs_cbor__decoder__struct&) = delete;
  wuffs_cbor__decoder__struct& operator=(
      const wuffs_cbor__decoder__struct&) = delete;

  // As above, the size of the struct is not part of the public API, and unless
  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
  // allocated, not stack allocated. Its size is not intended to be known at
  // compile time, but it is unfortunately divulged as a side effect of
  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
  // instead of "sizeof T", invoking the operator. To make the two values
  // different, so that passing the latter will be rejected by the initialize
  // function, we add an arbitrary amount of dead weight.
  uint8_t dead_weight[123000000];  // 123 MB.
#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)

  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
  initialize(
      size_t sizeof_star_self,
      uint64_t wuffs_version,
      uint32_t options) {
    return wuffs_cbor__decoder__initialize(
        this, sizeof_star_self, wuffs_version, options);
  }

  inline wuffs_base__token_decoder*
  upcast_as__wuffs_base__token_decoder() {
    return (wuffs_base__token_decoder*)this;
  }

  inline wuffs_base__empty_struct
  set_quirk_enabled(
      uint32_t a_quirk,
      bool a_enabled) {
    return wuffs_cbor__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
  }

  inline wuffs_base__range_ii_u64
  workbuf_len() const {
    return wuffs_cbor__decoder__workbuf_len(this);
  }

  inline wuffs_base__status
  decode_tokens(
      wuffs_base__token_buffer* a_dst,
      wuffs_base__io_buffer* a_src,
      wuffs_base__slice_u8 a_workbuf) {
    return wuffs_cbor__decoder__decode_tokens(this, a_dst, a_src, a_workbuf);
  }

#endif  // __cplusplus
};  // struct wuffs_cbor__decoder__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

#ifdef __cplusplus
}  // extern "C"
#endif

#ifdef __cplusplus
extern "C" {
#endif

// ---------------- Status Codes

// ---------------- Public Consts

// ---------------- Struct Declarations

typedef struct wuffs_crc32__ieee_hasher__struct wuffs_crc32__ieee_hasher;

// ---------------- Public Initializer Prototypes

// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
//
// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_crc32__ieee_hasher__initialize(
    wuffs_crc32__ieee_hasher* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options);

size_t
sizeof__wuffs_crc32__ieee_hasher();

// ---------------- Allocs

// These functions allocate and initialize Wuffs structs. They return NULL if
// memory allocation fails. If they return non-NULL, there is no need to call
// wuffs_foo__bar__initialize, but the caller is responsible for eventually
// calling free on the returned pointer. That pointer is effectively a C++
// std::unique_ptr<T, decltype(&free)>.

wuffs_crc32__ieee_hasher*
wuffs_crc32__ieee_hasher__alloc();

static inline wuffs_base__hasher_u32*
wuffs_crc32__ieee_hasher__alloc_as__wuffs_base__hasher_u32() {
  return (wuffs_base__hasher_u32*)(wuffs_crc32__ieee_hasher__alloc());
}

// ---------------- Upcasts

static inline wuffs_base__hasher_u32*
wuffs_crc32__ieee_hasher__upcast_as__wuffs_base__hasher_u32(
    wuffs_crc32__ieee_hasher* p) {
  return (wuffs_base__hasher_u32*)p;
}

// ---------------- Public Function Prototypes

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_crc32__ieee_hasher__set_quirk_enabled(
    wuffs_crc32__ieee_hasher* self,
    uint32_t a_quirk,
    bool a_enabled);

WUFFS_BASE__MAYBE_STATIC uint32_t
wuffs_crc32__ieee_hasher__update_u32(
    wuffs_crc32__ieee_hasher* self,
    wuffs_base__slice_u8 a_x);

// ---------------- Struct Definitions

// These structs' fields, and the sizeof them, are private implementation
// details that aren't guaranteed to be stable across Wuffs versions.
//
// See https://en.wikipedia.org/wiki/Opaque_pointer#C

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_crc32__ieee_hasher__struct {
  // Do not access the private_impl's or private_data's fields directly. There
  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
  // the wuffs_foo__bar__baz functions.
  //
  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.

  struct {
    uint32_t magic;
    uint32_t active_coroutine;
    wuffs_base__vtable vtable_for__wuffs_base__hasher_u32;
    wuffs_base__vtable null_vtable;

    uint32_t f_state;

    wuffs_base__empty_struct (*choosy_up)(
        wuffs_crc32__ieee_hasher* self,
        wuffs_base__slice_u8 a_x);
  } private_impl;

#ifdef __cplusplus
#if (__cplusplus >= 201103L)
  using unique_ptr = std::unique_ptr<wuffs_crc32__ieee_hasher, decltype(&free)>;

  // On failure, the alloc_etc functions return nullptr. They don't throw.

  static inline unique_ptr
  alloc() {
    return unique_ptr(wuffs_crc32__ieee_hasher__alloc(), &free);
  }

  static inline wuffs_base__hasher_u32::unique_ptr
  alloc_as__wuffs_base__hasher_u32() {
    return wuffs_base__hasher_u32::unique_ptr(
        wuffs_crc32__ieee_hasher__alloc_as__wuffs_base__hasher_u32(), &free);
  }
#endif  // (__cplusplus >= 201103L)

#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
  // Disallow constructing or copying an object via standard C++ mechanisms,
  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
  // size and field layout is not part of the public, stable, memory-safe API.
  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
  // their first argument) rather than tweaking bar.private_impl.qux fields.
  //
  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
  // order to provide convenience methods. These forward on "this", so that you
  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
  wuffs_crc32__ieee_hasher__struct() = delete;
  wuffs_crc32__ieee_hasher__struct(const wuffs_crc32__ieee_hasher__struct&) = delete;
  wuffs_crc32__ieee_hasher__struct& operator=(
      const wuffs_crc32__ieee_hasher__struct&) = delete;

  // As above, the size of the struct is not part of the public API, and unless
  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
  // allocated, not stack allocated. Its size is not intended to be known at
  // compile time, but it is unfortunately divulged as a side effect of
  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
  // instead of "sizeof T", invoking the operator. To make the two values
  // different, so that passing the latter will be rejected by the initialize
  // function, we add an arbitrary amount of dead weight.
  uint8_t dead_weight[123000000];  // 123 MB.
#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)

  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
  initialize(
      size_t sizeof_star_self,
      uint64_t wuffs_version,
      uint32_t options) {
    return wuffs_crc32__ieee_hasher__initialize(
        this, sizeof_star_self, wuffs_version, options);
  }

  inline wuffs_base__hasher_u32*
  upcast_as__wuffs_base__hasher_u32() {
    return (wuffs_base__hasher_u32*)this;
  }

  inline wuffs_base__empty_struct
  set_quirk_enabled(
      uint32_t a_quirk,
      bool a_enabled) {
    return wuffs_crc32__ieee_hasher__set_quirk_enabled(this, a_quirk, a_enabled);
  }

  inline uint32_t
  update_u32(
      wuffs_base__slice_u8 a_x) {
    return wuffs_crc32__ieee_hasher__update_u32(this, a_x);
  }

#endif  // __cplusplus
};  // struct wuffs_crc32__ieee_hasher__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

#ifdef __cplusplus
}  // extern "C"
#endif

#ifdef __cplusplus
extern "C" {
#endif

// ---------------- Status Codes

extern const char wuffs_deflate__error__bad_huffman_code_over_subscribed[];
extern const char wuffs_deflate__error__bad_huffman_code_under_subscribed[];
extern const char wuffs_deflate__error__bad_huffman_code_length_count[];
extern const char wuffs_deflate__error__bad_huffman_code_length_repetition[];
extern const char wuffs_deflate__error__bad_huffman_code[];
extern const char wuffs_deflate__error__bad_huffman_minimum_code_length[];
extern const char wuffs_deflate__error__bad_block[];
extern const char wuffs_deflate__error__bad_distance[];
extern const char wuffs_deflate__error__bad_distance_code_count[];
extern const char wuffs_deflate__error__bad_literal_length_code_count[];
extern const char wuffs_deflate__error__inconsistent_stored_block_length[];
extern const char wuffs_deflate__error__missing_end_of_block_code[];
extern const char wuffs_deflate__error__no_huffman_codes[];

// ---------------- Public Consts

#define WUFFS_DEFLATE__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 1

// ---------------- Struct Declarations

typedef struct wuffs_deflate__decoder__struct wuffs_deflate__decoder;

// ---------------- Public Initializer Prototypes

// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
//
// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_deflate__decoder__initialize(
    wuffs_deflate__decoder* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options);

size_t
sizeof__wuffs_deflate__decoder();

// ---------------- Allocs

// These functions allocate and initialize Wuffs structs. They return NULL if
// memory allocation fails. If they return non-NULL, there is no need to call
// wuffs_foo__bar__initialize, but the caller is responsible for eventually
// calling free on the returned pointer. That pointer is effectively a C++
// std::unique_ptr<T, decltype(&free)>.

wuffs_deflate__decoder*
wuffs_deflate__decoder__alloc();

static inline wuffs_base__io_transformer*
wuffs_deflate__decoder__alloc_as__wuffs_base__io_transformer() {
  return (wuffs_base__io_transformer*)(wuffs_deflate__decoder__alloc());
}

// ---------------- Upcasts

static inline wuffs_base__io_transformer*
wuffs_deflate__decoder__upcast_as__wuffs_base__io_transformer(
    wuffs_deflate__decoder* p) {
  return (wuffs_base__io_transformer*)p;
}

// ---------------- Public Function Prototypes

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_deflate__decoder__add_history(
    wuffs_deflate__decoder* self,
    wuffs_base__slice_u8 a_hist);

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_deflate__decoder__set_quirk_enabled(
    wuffs_deflate__decoder* self,
    uint32_t a_quirk,
    bool a_enabled);

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_deflate__decoder__workbuf_len(
    const wuffs_deflate__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_deflate__decoder__transform_io(
    wuffs_deflate__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__slice_u8 a_workbuf);

// ---------------- Struct Definitions

// These structs' fields, and the sizeof them, are private implementation
// details that aren't guaranteed to be stable across Wuffs versions.
//
// See https://en.wikipedia.org/wiki/Opaque_pointer#C

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_deflate__decoder__struct {
  // Do not access the private_impl's or private_data's fields directly. There
  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
  // the wuffs_foo__bar__baz functions.
  //
  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.

  struct {
    uint32_t magic;
    uint32_t active_coroutine;
    wuffs_base__vtable vtable_for__wuffs_base__io_transformer;
    wuffs_base__vtable null_vtable;

    uint32_t f_bits;
    uint32_t f_n_bits;
    uint32_t f_history_index;
    uint32_t f_n_huffs_bits[2];
    bool f_end_of_block;

    uint32_t p_transform_io[1];
    uint32_t p_decode_blocks[1];
    uint32_t p_decode_uncompressed[1];
    uint32_t p_init_dynamic_huffman[1];
    uint32_t p_decode_huffman_slow[1];
  } private_impl;

  struct {
    uint32_t f_huffs[2][1024];
    uint8_t f_history[33025];
    uint8_t f_code_lengths[320];

    struct {
      uint32_t v_final;
    } s_decode_blocks[1];
    struct {
      uint32_t v_length;
      uint64_t scratch;
    } s_decode_uncompressed[1];
    struct {
      uint32_t v_bits;
      uint32_t v_n_bits;
      uint32_t v_n_lit;
      uint32_t v_n_dist;
      uint32_t v_n_clen;
      uint32_t v_i;
      uint32_t v_mask;
      uint32_t v_table_entry;
      uint32_t v_n_extra_bits;
      uint8_t v_rep_symbol;
      uint32_t v_rep_count;
    } s_init_dynamic_huffman[1];
    struct {
      uint32_t v_bits;
      uint32_t v_n_bits;
      uint32_t v_table_entry;
      uint32_t v_table_entry_n_bits;
      uint32_t v_lmask;
      uint32_t v_dmask;
      uint32_t v_redir_top;
      uint32_t v_redir_mask;
      uint32_t v_length;
      uint32_t v_dist_minus_1;
      uint32_t v_hlen;
      uint32_t v_hdist;
      uint64_t scratch;
    } s_decode_huffman_slow[1];
  } private_data;

#ifdef __cplusplus
#if (__cplusplus >= 201103L)
  using unique_ptr = std::unique_ptr<wuffs_deflate__decoder, decltype(&free)>;

  // On failure, the alloc_etc functions return nullptr. They don't throw.

  static inline unique_ptr
  alloc() {
    return unique_ptr(wuffs_deflate__decoder__alloc(), &free);
  }

  static inline wuffs_base__io_transformer::unique_ptr
  alloc_as__wuffs_base__io_transformer() {
    return wuffs_base__io_transformer::unique_ptr(
        wuffs_deflate__decoder__alloc_as__wuffs_base__io_transformer(), &free);
  }
#endif  // (__cplusplus >= 201103L)

#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
  // Disallow constructing or copying an object via standard C++ mechanisms,
  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
  // size and field layout is not part of the public, stable, memory-safe API.
  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
  // their first argument) rather than tweaking bar.private_impl.qux fields.
  //
  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
  // order to provide convenience methods. These forward on "this", so that you
  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
  wuffs_deflate__decoder__struct() = delete;
  wuffs_deflate__decoder__struct(const wuffs_deflate__decoder__struct&) = delete;
  wuffs_deflate__decoder__struct& operator=(
      const wuffs_deflate__decoder__struct&) = delete;

  // As above, the size of the struct is not part of the public API, and unless
  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
  // allocated, not stack allocated. Its size is not intended to be known at
  // compile time, but it is unfortunately divulged as a side effect of
  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
  // instead of "sizeof T", invoking the operator. To make the two values
  // different, so that passing the latter will be rejected by the initialize
  // function, we add an arbitrary amount of dead weight.
  uint8_t dead_weight[123000000];  // 123 MB.
#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)

  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
  initialize(
      size_t sizeof_star_self,
      uint64_t wuffs_version,
      uint32_t options) {
    return wuffs_deflate__decoder__initialize(
        this, sizeof_star_self, wuffs_version, options);
  }

  inline wuffs_base__io_transformer*
  upcast_as__wuffs_base__io_transformer() {
    return (wuffs_base__io_transformer*)this;
  }

  inline wuffs_base__empty_struct
  add_history(
      wuffs_base__slice_u8 a_hist) {
    return wuffs_deflate__decoder__add_history(this, a_hist);
  }

  inline wuffs_base__empty_struct
  set_quirk_enabled(
      uint32_t a_quirk,
      bool a_enabled) {
    return wuffs_deflate__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
  }

  inline wuffs_base__range_ii_u64
  workbuf_len() const {
    return wuffs_deflate__decoder__workbuf_len(this);
  }

  inline wuffs_base__status
  transform_io(
      wuffs_base__io_buffer* a_dst,
      wuffs_base__io_buffer* a_src,
      wuffs_base__slice_u8 a_workbuf) {
    return wuffs_deflate__decoder__transform_io(this, a_dst, a_src, a_workbuf);
  }

#endif  // __cplusplus
};  // struct wuffs_deflate__decoder__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

#ifdef __cplusplus
}  // extern "C"
#endif

#ifdef __cplusplus
extern "C" {
#endif

// ---------------- Status Codes

extern const char wuffs_lzw__error__bad_code[];

// ---------------- Public Consts

#define WUFFS_LZW__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 0

// ---------------- Struct Declarations

typedef struct wuffs_lzw__decoder__struct wuffs_lzw__decoder;

// ---------------- Public Initializer Prototypes

// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
//
// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_lzw__decoder__initialize(
    wuffs_lzw__decoder* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options);

size_t
sizeof__wuffs_lzw__decoder();

// ---------------- Allocs

// These functions allocate and initialize Wuffs structs. They return NULL if
// memory allocation fails. If they return non-NULL, there is no need to call
// wuffs_foo__bar__initialize, but the caller is responsible for eventually
// calling free on the returned pointer. That pointer is effectively a C++
// std::unique_ptr<T, decltype(&free)>.

wuffs_lzw__decoder*
wuffs_lzw__decoder__alloc();

static inline wuffs_base__io_transformer*
wuffs_lzw__decoder__alloc_as__wuffs_base__io_transformer() {
  return (wuffs_base__io_transformer*)(wuffs_lzw__decoder__alloc());
}

// ---------------- Upcasts

static inline wuffs_base__io_transformer*
wuffs_lzw__decoder__upcast_as__wuffs_base__io_transformer(
    wuffs_lzw__decoder* p) {
  return (wuffs_base__io_transformer*)p;
}

// ---------------- Public Function Prototypes

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_lzw__decoder__set_quirk_enabled(
    wuffs_lzw__decoder* self,
    uint32_t a_quirk,
    bool a_enabled);

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_lzw__decoder__set_literal_width(
    wuffs_lzw__decoder* self,
    uint32_t a_lw);

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_lzw__decoder__workbuf_len(
    const wuffs_lzw__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_lzw__decoder__transform_io(
    wuffs_lzw__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__slice_u8 a_workbuf);

WUFFS_BASE__MAYBE_STATIC wuffs_base__slice_u8
wuffs_lzw__decoder__flush(
    wuffs_lzw__decoder* self);

// ---------------- Struct Definitions

// These structs' fields, and the sizeof them, are private implementation
// details that aren't guaranteed to be stable across Wuffs versions.
//
// See https://en.wikipedia.org/wiki/Opaque_pointer#C

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_lzw__decoder__struct {
  // Do not access the private_impl's or private_data's fields directly. There
  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
  // the wuffs_foo__bar__baz functions.
  //
  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.

  struct {
    uint32_t magic;
    uint32_t active_coroutine;
    wuffs_base__vtable vtable_for__wuffs_base__io_transformer;
    wuffs_base__vtable null_vtable;

    uint32_t f_set_literal_width_arg;
    uint32_t f_literal_width;
    uint32_t f_clear_code;
    uint32_t f_end_code;
    uint32_t f_save_code;
    uint32_t f_prev_code;
    uint32_t f_width;
    uint32_t f_bits;
    uint32_t f_n_bits;
    uint32_t f_output_ri;
    uint32_t f_output_wi;
    uint32_t f_read_from_return_value;
    uint16_t f_prefixes[4096];

    uint32_t p_transform_io[1];
    uint32_t p_write_to[1];
  } private_impl;

  struct {
    uint8_t f_suffixes[4096][8];
    uint16_t f_lm1s[4096];
    uint8_t f_output[8199];
  } private_data;

#ifdef __cplusplus
#if (__cplusplus >= 201103L)
  using unique_ptr = std::unique_ptr<wuffs_lzw__decoder, decltype(&free)>;

  // On failure, the alloc_etc functions return nullptr. They don't throw.

  static inline unique_ptr
  alloc() {
    return unique_ptr(wuffs_lzw__decoder__alloc(), &free);
  }

  static inline wuffs_base__io_transformer::unique_ptr
  alloc_as__wuffs_base__io_transformer() {
    return wuffs_base__io_transformer::unique_ptr(
        wuffs_lzw__decoder__alloc_as__wuffs_base__io_transformer(), &free);
  }
#endif  // (__cplusplus >= 201103L)

#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
  // Disallow constructing or copying an object via standard C++ mechanisms,
  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
  // size and field layout is not part of the public, stable, memory-safe API.
  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
  // their first argument) rather than tweaking bar.private_impl.qux fields.
  //
  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
  // order to provide convenience methods. These forward on "this", so that you
  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
  wuffs_lzw__decoder__struct() = delete;
  wuffs_lzw__decoder__struct(const wuffs_lzw__decoder__struct&) = delete;
  wuffs_lzw__decoder__struct& operator=(
      const wuffs_lzw__decoder__struct&) = delete;

  // As above, the size of the struct is not part of the public API, and unless
  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
  // allocated, not stack allocated. Its size is not intended to be known at
  // compile time, but it is unfortunately divulged as a side effect of
  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
  // instead of "sizeof T", invoking the operator. To make the two values
  // different, so that passing the latter will be rejected by the initialize
  // function, we add an arbitrary amount of dead weight.
  uint8_t dead_weight[123000000];  // 123 MB.
#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)

  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
  initialize(
      size_t sizeof_star_self,
      uint64_t wuffs_version,
      uint32_t options) {
    return wuffs_lzw__decoder__initialize(
        this, sizeof_star_self, wuffs_version, options);
  }

  inline wuffs_base__io_transformer*
  upcast_as__wuffs_base__io_transformer() {
    return (wuffs_base__io_transformer*)this;
  }

  inline wuffs_base__empty_struct
  set_quirk_enabled(
      uint32_t a_quirk,
      bool a_enabled) {
    return wuffs_lzw__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
  }

  inline wuffs_base__empty_struct
  set_literal_width(
      uint32_t a_lw) {
    return wuffs_lzw__decoder__set_literal_width(this, a_lw);
  }

  inline wuffs_base__range_ii_u64
  workbuf_len() const {
    return wuffs_lzw__decoder__workbuf_len(this);
  }

  inline wuffs_base__status
  transform_io(
      wuffs_base__io_buffer* a_dst,
      wuffs_base__io_buffer* a_src,
      wuffs_base__slice_u8 a_workbuf) {
    return wuffs_lzw__decoder__transform_io(this, a_dst, a_src, a_workbuf);
  }

  inline wuffs_base__slice_u8
  flush() {
    return wuffs_lzw__decoder__flush(this);
  }

#endif  // __cplusplus
};  // struct wuffs_lzw__decoder__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

#ifdef __cplusplus
}  // extern "C"
#endif

#ifdef __cplusplus
extern "C" {
#endif

// ---------------- Status Codes

extern const char wuffs_gif__error__bad_extension_label[];
extern const char wuffs_gif__error__bad_frame_size[];
extern const char wuffs_gif__error__bad_graphic_control[];
extern const char wuffs_gif__error__bad_header[];
extern const char wuffs_gif__error__bad_literal_width[];
extern const char wuffs_gif__error__bad_palette[];

// ---------------- Public Consts

#define WUFFS_GIF__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 0

#define WUFFS_GIF__QUIRK_DELAY_NUM_DECODED_FRAMES 1041635328

#define WUFFS_GIF__QUIRK_FIRST_FRAME_LOCAL_PALETTE_MEANS_BLACK_BACKGROUND 1041635329

#define WUFFS_GIF__QUIRK_HONOR_BACKGROUND_COLOR 1041635330

#define WUFFS_GIF__QUIRK_IGNORE_TOO_MUCH_PIXEL_DATA 1041635331

#define WUFFS_GIF__QUIRK_IMAGE_BOUNDS_ARE_STRICT 1041635332

#define WUFFS_GIF__QUIRK_REJECT_EMPTY_FRAME 1041635333

#define WUFFS_GIF__QUIRK_REJECT_EMPTY_PALETTE 1041635334

// ---------------- Struct Declarations

typedef struct wuffs_gif__decoder__struct wuffs_gif__decoder;

// ---------------- Public Initializer Prototypes

// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
//
// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_gif__decoder__initialize(
    wuffs_gif__decoder* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options);

size_t
sizeof__wuffs_gif__decoder();

// ---------------- Allocs

// These functions allocate and initialize Wuffs structs. They return NULL if
// memory allocation fails. If they return non-NULL, there is no need to call
// wuffs_foo__bar__initialize, but the caller is responsible for eventually
// calling free on the returned pointer. That pointer is effectively a C++
// std::unique_ptr<T, decltype(&free)>.

wuffs_gif__decoder*
wuffs_gif__decoder__alloc();

static inline wuffs_base__image_decoder*
wuffs_gif__decoder__alloc_as__wuffs_base__image_decoder() {
  return (wuffs_base__image_decoder*)(wuffs_gif__decoder__alloc());
}

// ---------------- Upcasts

static inline wuffs_base__image_decoder*
wuffs_gif__decoder__upcast_as__wuffs_base__image_decoder(
    wuffs_gif__decoder* p) {
  return (wuffs_base__image_decoder*)p;
}

// ---------------- Public Function Prototypes

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_gif__decoder__set_quirk_enabled(
    wuffs_gif__decoder* self,
    uint32_t a_quirk,
    bool a_enabled);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_gif__decoder__decode_image_config(
    wuffs_gif__decoder* self,
    wuffs_base__image_config* a_dst,
    wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_gif__decoder__set_report_metadata(
    wuffs_gif__decoder* self,
    uint32_t a_fourcc,
    bool a_report);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_gif__decoder__tell_me_more(
    wuffs_gif__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__more_information* a_minfo,
    wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC uint32_t
wuffs_gif__decoder__num_animation_loops(
    const wuffs_gif__decoder* self);

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_gif__decoder__num_decoded_frame_configs(
    const wuffs_gif__decoder* self);

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_gif__decoder__num_decoded_frames(
    const wuffs_gif__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
wuffs_gif__decoder__frame_dirty_rect(
    const wuffs_gif__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_gif__decoder__workbuf_len(
    const wuffs_gif__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_gif__decoder__restart_frame(
    wuffs_gif__decoder* self,
    uint64_t a_index,
    uint64_t a_io_position);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_gif__decoder__decode_frame_config(
    wuffs_gif__decoder* self,
    wuffs_base__frame_config* a_dst,
    wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_gif__decoder__decode_frame(
    wuffs_gif__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__pixel_blend a_blend,
    wuffs_base__slice_u8 a_workbuf,
    wuffs_base__decode_frame_options* a_opts);

// ---------------- Struct Definitions

// These structs' fields, and the sizeof them, are private implementation
// details that aren't guaranteed to be stable across Wuffs versions.
//
// See https://en.wikipedia.org/wiki/Opaque_pointer#C

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_gif__decoder__struct {
  // Do not access the private_impl's or private_data's fields directly. There
  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
  // the wuffs_foo__bar__baz functions.
  //
  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.

  struct {
    uint32_t magic;
    uint32_t active_coroutine;
    wuffs_base__vtable vtable_for__wuffs_base__image_decoder;
    wuffs_base__vtable null_vtable;

    uint32_t f_width;
    uint32_t f_height;
    uint8_t f_call_sequence;
    bool f_ignore_metadata;
    bool f_report_metadata_iccp;
    bool f_report_metadata_xmp;
    uint32_t f_metadata_fourcc;
    uint64_t f_metadata_io_position;
    bool f_quirks[7];
    bool f_delayed_num_decoded_frames;
    bool f_end_of_data;
    bool f_restarted;
    bool f_previous_lzw_decode_ended_abruptly;
    bool f_has_global_palette;
    uint8_t f_interlace;
    bool f_seen_num_loops;
    uint32_t f_num_loops;
    uint32_t f_background_color_u32_argb_premul;
    uint32_t f_black_color_u32_argb_premul;
    bool f_gc_has_transparent_index;
    uint8_t f_gc_transparent_index;
    uint8_t f_gc_disposal;
    uint64_t f_gc_duration;
    uint64_t f_frame_config_io_position;
    uint64_t f_num_decoded_frame_configs_value;
    uint64_t f_num_decoded_frames_value;
    uint32_t f_frame_rect_x0;
    uint32_t f_frame_rect_y0;
    uint32_t f_frame_rect_x1;
    uint32_t f_frame_rect_y1;
    uint32_t f_dst_x;
    uint32_t f_dst_y;
    uint32_t f_dirty_max_excl_y;
    uint64_t f_compressed_ri;
    uint64_t f_compressed_wi;
    wuffs_base__pixel_swizzler f_swizzler;

    uint32_t p_decode_image_config[1];
    uint32_t p_tell_me_more[1];
    uint32_t p_decode_frame_config[1];
    uint32_t p_skip_frame[1];
    uint32_t p_decode_frame[1];
    uint32_t p_decode_up_to_id_part1[1];
    uint32_t p_decode_header[1];
    uint32_t p_decode_lsd[1];
    uint32_t p_decode_extension[1];
    uint32_t p_skip_blocks[1];
    uint32_t p_decode_ae[1];
    uint32_t p_decode_gc[1];
    uint32_t p_decode_id_part0[1];
    uint32_t p_decode_id_part1[1];
    uint32_t p_decode_id_part2[1];
  } private_impl;

  struct {
    uint8_t f_compressed[4096];
    uint8_t f_palettes[2][1024];
    uint8_t f_dst_palette[1024];
    wuffs_lzw__decoder f_lzw;

    struct {
      uint32_t v_background_color;
    } s_decode_frame_config[1];
    struct {
      uint64_t scratch;
    } s_skip_frame[1];
    struct {
      uint8_t v_c[6];
      uint32_t v_i;
    } s_decode_header[1];
    struct {
      uint8_t v_flags;
      uint8_t v_background_color_index;
      uint32_t v_num_palette_entries;
      uint32_t v_i;
      uint64_t scratch;
    } s_decode_lsd[1];
    struct {
      uint64_t scratch;
    } s_skip_blocks[1];
    struct {
      uint8_t v_block_size;
      bool v_is_animexts;
      bool v_is_netscape;
      bool v_is_iccp;
      bool v_is_xmp;
      uint64_t scratch;
    } s_decode_ae[1];
    struct {
      uint64_t scratch;
    } s_decode_gc[1];
    struct {
      uint64_t scratch;
    } s_decode_id_part0[1];
    struct {
      uint8_t v_which_palette;
      uint32_t v_num_palette_entries;
      uint32_t v_i;
      uint64_t scratch;
    } s_decode_id_part1[1];
    struct {
      uint64_t v_block_size;
      bool v_need_block_size;
      wuffs_base__status v_lzw_status;
      uint64_t scratch;
    } s_decode_id_part2[1];
  } private_data;

#ifdef __cplusplus
#if (__cplusplus >= 201103L)
  using unique_ptr = std::unique_ptr<wuffs_gif__decoder, decltype(&free)>;

  // On failure, the alloc_etc functions return nullptr. They don't throw.

  static inline unique_ptr
  alloc() {
    return unique_ptr(wuffs_gif__decoder__alloc(), &free);
  }

  static inline wuffs_base__image_decoder::unique_ptr
  alloc_as__wuffs_base__image_decoder() {
    return wuffs_base__image_decoder::unique_ptr(
        wuffs_gif__decoder__alloc_as__wuffs_base__image_decoder(), &free);
  }
#endif  // (__cplusplus >= 201103L)

#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
  // Disallow constructing or copying an object via standard C++ mechanisms,
  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
  // size and field layout is not part of the public, stable, memory-safe API.
  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
  // their first argument) rather than tweaking bar.private_impl.qux fields.
  //
  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
  // order to provide convenience methods. These forward on "this", so that you
  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
  wuffs_gif__decoder__struct() = delete;
  wuffs_gif__decoder__struct(const wuffs_gif__decoder__struct&) = delete;
  wuffs_gif__decoder__struct& operator=(
      const wuffs_gif__decoder__struct&) = delete;

  // As above, the size of the struct is not part of the public API, and unless
  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
  // allocated, not stack allocated. Its size is not intended to be known at
  // compile time, but it is unfortunately divulged as a side effect of
  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
  // instead of "sizeof T", invoking the operator. To make the two values
  // different, so that passing the latter will be rejected by the initialize
  // function, we add an arbitrary amount of dead weight.
  uint8_t dead_weight[123000000];  // 123 MB.
#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)

  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
  initialize(
      size_t sizeof_star_self,
      uint64_t wuffs_version,
      uint32_t options) {
    return wuffs_gif__decoder__initialize(
        this, sizeof_star_self, wuffs_version, options);
  }

  inline wuffs_base__image_decoder*
  upcast_as__wuffs_base__image_decoder() {
    return (wuffs_base__image_decoder*)this;
  }

  inline wuffs_base__empty_struct
  set_quirk_enabled(
      uint32_t a_quirk,
      bool a_enabled) {
    return wuffs_gif__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
  }

  inline wuffs_base__status
  decode_image_config(
      wuffs_base__image_config* a_dst,
      wuffs_base__io_buffer* a_src) {
    return wuffs_gif__decoder__decode_image_config(this, a_dst, a_src);
  }

  inline wuffs_base__empty_struct
  set_report_metadata(
      uint32_t a_fourcc,
      bool a_report) {
    return wuffs_gif__decoder__set_report_metadata(this, a_fourcc, a_report);
  }

  inline wuffs_base__status
  tell_me_more(
      wuffs_base__io_buffer* a_dst,
      wuffs_base__more_information* a_minfo,
      wuffs_base__io_buffer* a_src) {
    return wuffs_gif__decoder__tell_me_more(this, a_dst, a_minfo, a_src);
  }

  inline uint32_t
  num_animation_loops() const {
    return wuffs_gif__decoder__num_animation_loops(this);
  }

  inline uint64_t
  num_decoded_frame_configs() const {
    return wuffs_gif__decoder__num_decoded_frame_configs(this);
  }

  inline uint64_t
  num_decoded_frames() const {
    return wuffs_gif__decoder__num_decoded_frames(this);
  }

  inline wuffs_base__rect_ie_u32
  frame_dirty_rect() const {
    return wuffs_gif__decoder__frame_dirty_rect(this);
  }

  inline wuffs_base__range_ii_u64
  workbuf_len() const {
    return wuffs_gif__decoder__workbuf_len(this);
  }

  inline wuffs_base__status
  restart_frame(
      uint64_t a_index,
      uint64_t a_io_position) {
    return wuffs_gif__decoder__restart_frame(this, a_index, a_io_position);
  }

  inline wuffs_base__status
  decode_frame_config(
      wuffs_base__frame_config* a_dst,
      wuffs_base__io_buffer* a_src) {
    return wuffs_gif__decoder__decode_frame_config(this, a_dst, a_src);
  }

  inline wuffs_base__status
  decode_frame(
      wuffs_base__pixel_buffer* a_dst,
      wuffs_base__io_buffer* a_src,
      wuffs_base__pixel_blend a_blend,
      wuffs_base__slice_u8 a_workbuf,
      wuffs_base__decode_frame_options* a_opts) {
    return wuffs_gif__decoder__decode_frame(this, a_dst, a_src, a_blend, a_workbuf, a_opts);
  }

#endif  // __cplusplus
};  // struct wuffs_gif__decoder__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

#ifdef __cplusplus
}  // extern "C"
#endif

#ifdef __cplusplus
extern "C" {
#endif

// ---------------- Status Codes

extern const char wuffs_gzip__error__bad_checksum[];
extern const char wuffs_gzip__error__bad_compression_method[];
extern const char wuffs_gzip__error__bad_encoding_flags[];
extern const char wuffs_gzip__error__bad_header[];

// ---------------- Public Consts

#define WUFFS_GZIP__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 1

// ---------------- Struct Declarations

typedef struct wuffs_gzip__decoder__struct wuffs_gzip__decoder;

// ---------------- Public Initializer Prototypes

// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
//
// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_gzip__decoder__initialize(
    wuffs_gzip__decoder* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options);

size_t
sizeof__wuffs_gzip__decoder();

// ---------------- Allocs

// These functions allocate and initialize Wuffs structs. They return NULL if
// memory allocation fails. If they return non-NULL, there is no need to call
// wuffs_foo__bar__initialize, but the caller is responsible for eventually
// calling free on the returned pointer. That pointer is effectively a C++
// std::unique_ptr<T, decltype(&free)>.

wuffs_gzip__decoder*
wuffs_gzip__decoder__alloc();

static inline wuffs_base__io_transformer*
wuffs_gzip__decoder__alloc_as__wuffs_base__io_transformer() {
  return (wuffs_base__io_transformer*)(wuffs_gzip__decoder__alloc());
}

// ---------------- Upcasts

static inline wuffs_base__io_transformer*
wuffs_gzip__decoder__upcast_as__wuffs_base__io_transformer(
    wuffs_gzip__decoder* p) {
  return (wuffs_base__io_transformer*)p;
}

// ---------------- Public Function Prototypes

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_gzip__decoder__set_quirk_enabled(
    wuffs_gzip__decoder* self,
    uint32_t a_quirk,
    bool a_enabled);

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_gzip__decoder__workbuf_len(
    const wuffs_gzip__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_gzip__decoder__transform_io(
    wuffs_gzip__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__slice_u8 a_workbuf);

// ---------------- Struct Definitions

// These structs' fields, and the sizeof them, are private implementation
// details that aren't guaranteed to be stable across Wuffs versions.
//
// See https://en.wikipedia.org/wiki/Opaque_pointer#C

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_gzip__decoder__struct {
  // Do not access the private_impl's or private_data's fields directly. There
  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
  // the wuffs_foo__bar__baz functions.
  //
  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.

  struct {
    uint32_t magic;
    uint32_t active_coroutine;
    wuffs_base__vtable vtable_for__wuffs_base__io_transformer;
    wuffs_base__vtable null_vtable;

    bool f_ignore_checksum;

    uint32_t p_transform_io[1];
  } private_impl;

  struct {
    wuffs_crc32__ieee_hasher f_checksum;
    wuffs_deflate__decoder f_flate;

    struct {
      uint8_t v_flags;
      uint32_t v_checksum_got;
      uint32_t v_decoded_length_got;
      uint32_t v_checksum_want;
      uint64_t scratch;
    } s_transform_io[1];
  } private_data;

#ifdef __cplusplus
#if (__cplusplus >= 201103L)
  using unique_ptr = std::unique_ptr<wuffs_gzip__decoder, decltype(&free)>;

  // On failure, the alloc_etc functions return nullptr. They don't throw.

  static inline unique_ptr
  alloc() {
    return unique_ptr(wuffs_gzip__decoder__alloc(), &free);
  }

  static inline wuffs_base__io_transformer::unique_ptr
  alloc_as__wuffs_base__io_transformer() {
    return wuffs_base__io_transformer::unique_ptr(
        wuffs_gzip__decoder__alloc_as__wuffs_base__io_transformer(), &free);
  }
#endif  // (__cplusplus >= 201103L)

#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
  // Disallow constructing or copying an object via standard C++ mechanisms,
  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
  // size and field layout is not part of the public, stable, memory-safe API.
  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
  // their first argument) rather than tweaking bar.private_impl.qux fields.
  //
  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
  // order to provide convenience methods. These forward on "this", so that you
  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
  wuffs_gzip__decoder__struct() = delete;
  wuffs_gzip__decoder__struct(const wuffs_gzip__decoder__struct&) = delete;
  wuffs_gzip__decoder__struct& operator=(
      const wuffs_gzip__decoder__struct&) = delete;

  // As above, the size of the struct is not part of the public API, and unless
  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
  // allocated, not stack allocated. Its size is not intended to be known at
  // compile time, but it is unfortunately divulged as a side effect of
  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
  // instead of "sizeof T", invoking the operator. To make the two values
  // different, so that passing the latter will be rejected by the initialize
  // function, we add an arbitrary amount of dead weight.
  uint8_t dead_weight[123000000];  // 123 MB.
#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)

  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
  initialize(
      size_t sizeof_star_self,
      uint64_t wuffs_version,
      uint32_t options) {
    return wuffs_gzip__decoder__initialize(
        this, sizeof_star_self, wuffs_version, options);
  }

  inline wuffs_base__io_transformer*
  upcast_as__wuffs_base__io_transformer() {
    return (wuffs_base__io_transformer*)this;
  }

  inline wuffs_base__empty_struct
  set_quirk_enabled(
      uint32_t a_quirk,
      bool a_enabled) {
    return wuffs_gzip__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
  }

  inline wuffs_base__range_ii_u64
  workbuf_len() const {
    return wuffs_gzip__decoder__workbuf_len(this);
  }

  inline wuffs_base__status
  transform_io(
      wuffs_base__io_buffer* a_dst,
      wuffs_base__io_buffer* a_src,
      wuffs_base__slice_u8 a_workbuf) {
    return wuffs_gzip__decoder__transform_io(this, a_dst, a_src, a_workbuf);
  }

#endif  // __cplusplus
};  // struct wuffs_gzip__decoder__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

#ifdef __cplusplus
}  // extern "C"
#endif

#ifdef __cplusplus
extern "C" {
#endif

// ---------------- Status Codes

extern const char wuffs_json__error__bad_c0_control_code[];
extern const char wuffs_json__error__bad_utf_8[];
extern const char wuffs_json__error__bad_backslash_escape[];
extern const char wuffs_json__error__bad_input[];
extern const char wuffs_json__error__bad_new_line_in_a_string[];
extern const char wuffs_json__error__bad_quirk_combination[];
extern const char wuffs_json__error__unsupported_number_length[];
extern const char wuffs_json__error__unsupported_recursion_depth[];

// ---------------- Public Consts

#define WUFFS_JSON__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 0

#define WUFFS_JSON__DECODER_DEPTH_MAX_INCL 1024

#define WUFFS_JSON__DECODER_DST_TOKEN_BUFFER_LENGTH_MIN_INCL 1

#define WUFFS_JSON__DECODER_SRC_IO_BUFFER_LENGTH_MIN_INCL 100

#define WUFFS_JSON__QUIRK_ALLOW_ASCII_CONTROL_CODES 1225364480

#define WUFFS_JSON__QUIRK_ALLOW_BACKSLASH_A 1225364481

#define WUFFS_JSON__QUIRK_ALLOW_BACKSLASH_CAPITAL_U 1225364482

#define WUFFS_JSON__QUIRK_ALLOW_BACKSLASH_E 1225364483

#define WUFFS_JSON__QUIRK_ALLOW_BACKSLASH_NEW_LINE 1225364484

#define WUFFS_JSON__QUIRK_ALLOW_BACKSLASH_QUESTION_MARK 1225364485

#define WUFFS_JSON__QUIRK_ALLOW_BACKSLASH_SINGLE_QUOTE 1225364486

#define WUFFS_JSON__QUIRK_ALLOW_BACKSLASH_V 1225364487

#define WUFFS_JSON__QUIRK_ALLOW_BACKSLASH_X_AS_CODE_POINTS 1225364489

#define WUFFS_JSON__QUIRK_ALLOW_BACKSLASH_ZERO 1225364490

#define WUFFS_JSON__QUIRK_ALLOW_COMMENT_BLOCK 1225364491

#define WUFFS_JSON__QUIRK_ALLOW_COMMENT_LINE 1225364492

#define WUFFS_JSON__QUIRK_ALLOW_EXTRA_COMMA 1225364493

#define WUFFS_JSON__QUIRK_ALLOW_INF_NAN_NUMBERS 1225364494

#define WUFFS_JSON__QUIRK_ALLOW_LEADING_ASCII_RECORD_SEPARATOR 1225364495

#define WUFFS_JSON__QUIRK_ALLOW_LEADING_UNICODE_BYTE_ORDER_MARK 1225364496

#define WUFFS_JSON__QUIRK_ALLOW_TRAILING_FILLER 1225364497

#define WUFFS_JSON__QUIRK_EXPECT_TRAILING_NEW_LINE_OR_EOF 1225364498

#define WUFFS_JSON__QUIRK_JSON_POINTER_ALLOW_TILDE_N_TILDE_R_TILDE_T 1225364499

#define WUFFS_JSON__QUIRK_REPLACE_INVALID_UNICODE 1225364500

// ---------------- Struct Declarations

typedef struct wuffs_json__decoder__struct wuffs_json__decoder;

// ---------------- Public Initializer Prototypes

// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
//
// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_json__decoder__initialize(
    wuffs_json__decoder* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options);

size_t
sizeof__wuffs_json__decoder();

// ---------------- Allocs

// These functions allocate and initialize Wuffs structs. They return NULL if
// memory allocation fails. If they return non-NULL, there is no need to call
// wuffs_foo__bar__initialize, but the caller is responsible for eventually
// calling free on the returned pointer. That pointer is effectively a C++
// std::unique_ptr<T, decltype(&free)>.

wuffs_json__decoder*
wuffs_json__decoder__alloc();

static inline wuffs_base__token_decoder*
wuffs_json__decoder__alloc_as__wuffs_base__token_decoder() {
  return (wuffs_base__token_decoder*)(wuffs_json__decoder__alloc());
}

// ---------------- Upcasts

static inline wuffs_base__token_decoder*
wuffs_json__decoder__upcast_as__wuffs_base__token_decoder(
    wuffs_json__decoder* p) {
  return (wuffs_base__token_decoder*)p;
}

// ---------------- Public Function Prototypes

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_json__decoder__set_quirk_enabled(
    wuffs_json__decoder* self,
    uint32_t a_quirk,
    bool a_enabled);

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_json__decoder__workbuf_len(
    const wuffs_json__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_json__decoder__decode_tokens(
    wuffs_json__decoder* self,
    wuffs_base__token_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__slice_u8 a_workbuf);

// ---------------- Struct Definitions

// These structs' fields, and the sizeof them, are private implementation
// details that aren't guaranteed to be stable across Wuffs versions.
//
// See https://en.wikipedia.org/wiki/Opaque_pointer#C

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_json__decoder__struct {
  // Do not access the private_impl's or private_data's fields directly. There
  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
  // the wuffs_foo__bar__baz functions.
  //
  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.

  struct {
    uint32_t magic;
    uint32_t active_coroutine;
    wuffs_base__vtable vtable_for__wuffs_base__token_decoder;
    wuffs_base__vtable null_vtable;

    bool f_quirks[21];
    bool f_allow_leading_ars;
    bool f_allow_leading_ubom;
    bool f_end_of_data;
    uint8_t f_trailer_stop;
    uint8_t f_comment_type;

    uint32_t p_decode_tokens[1];
    uint32_t p_decode_leading[1];
    uint32_t p_decode_comment[1];
    uint32_t p_decode_inf_nan[1];
    uint32_t p_decode_trailer[1];
  } private_impl;

  struct {
    uint32_t f_stack[32];

    struct {
      uint32_t v_depth;
      uint32_t v_expect;
      uint32_t v_expect_after_value;
    } s_decode_tokens[1];
    struct {
      uint32_t v_neg;
    } s_decode_inf_nan[1];
  } private_data;

#ifdef __cplusplus
#if (__cplusplus >= 201103L)
  using unique_ptr = std::unique_ptr<wuffs_json__decoder, decltype(&free)>;

  // On failure, the alloc_etc functions return nullptr. They don't throw.

  static inline unique_ptr
  alloc() {
    return unique_ptr(wuffs_json__decoder__alloc(), &free);
  }

  static inline wuffs_base__token_decoder::unique_ptr
  alloc_as__wuffs_base__token_decoder() {
    return wuffs_base__token_decoder::unique_ptr(
        wuffs_json__decoder__alloc_as__wuffs_base__token_decoder(), &free);
  }
#endif  // (__cplusplus >= 201103L)

#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
  // Disallow constructing or copying an object via standard C++ mechanisms,
  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
  // size and field layout is not part of the public, stable, memory-safe API.
  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
  // their first argument) rather than tweaking bar.private_impl.qux fields.
  //
  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
  // order to provide convenience methods. These forward on "this", so that you
  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
  wuffs_json__decoder__struct() = delete;
  wuffs_json__decoder__struct(const wuffs_json__decoder__struct&) = delete;
  wuffs_json__decoder__struct& operator=(
      const wuffs_json__decoder__struct&) = delete;

  // As above, the size of the struct is not part of the public API, and unless
  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
  // allocated, not stack allocated. Its size is not intended to be known at
  // compile time, but it is unfortunately divulged as a side effect of
  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
  // instead of "sizeof T", invoking the operator. To make the two values
  // different, so that passing the latter will be rejected by the initialize
  // function, we add an arbitrary amount of dead weight.
  uint8_t dead_weight[123000000];  // 123 MB.
#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)

  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
  initialize(
      size_t sizeof_star_self,
      uint64_t wuffs_version,
      uint32_t options) {
    return wuffs_json__decoder__initialize(
        this, sizeof_star_self, wuffs_version, options);
  }

  inline wuffs_base__token_decoder*
  upcast_as__wuffs_base__token_decoder() {
    return (wuffs_base__token_decoder*)this;
  }

  inline wuffs_base__empty_struct
  set_quirk_enabled(
      uint32_t a_quirk,
      bool a_enabled) {
    return wuffs_json__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
  }

  inline wuffs_base__range_ii_u64
  workbuf_len() const {
    return wuffs_json__decoder__workbuf_len(this);
  }

  inline wuffs_base__status
  decode_tokens(
      wuffs_base__token_buffer* a_dst,
      wuffs_base__io_buffer* a_src,
      wuffs_base__slice_u8 a_workbuf) {
    return wuffs_json__decoder__decode_tokens(this, a_dst, a_src, a_workbuf);
  }

#endif  // __cplusplus
};  // struct wuffs_json__decoder__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

#ifdef __cplusplus
}  // extern "C"
#endif

#ifdef __cplusplus
extern "C" {
#endif

// ---------------- Status Codes

extern const char wuffs_nie__error__bad_header[];
extern const char wuffs_nie__error__unsupported_nie_file[];

// ---------------- Public Consts

#define WUFFS_NIE__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 0

// ---------------- Struct Declarations

typedef struct wuffs_nie__decoder__struct wuffs_nie__decoder;

// ---------------- Public Initializer Prototypes

// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
//
// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_nie__decoder__initialize(
    wuffs_nie__decoder* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options);

size_t
sizeof__wuffs_nie__decoder();

// ---------------- Allocs

// These functions allocate and initialize Wuffs structs. They return NULL if
// memory allocation fails. If they return non-NULL, there is no need to call
// wuffs_foo__bar__initialize, but the caller is responsible for eventually
// calling free on the returned pointer. That pointer is effectively a C++
// std::unique_ptr<T, decltype(&free)>.

wuffs_nie__decoder*
wuffs_nie__decoder__alloc();

static inline wuffs_base__image_decoder*
wuffs_nie__decoder__alloc_as__wuffs_base__image_decoder() {
  return (wuffs_base__image_decoder*)(wuffs_nie__decoder__alloc());
}

// ---------------- Upcasts

static inline wuffs_base__image_decoder*
wuffs_nie__decoder__upcast_as__wuffs_base__image_decoder(
    wuffs_nie__decoder* p) {
  return (wuffs_base__image_decoder*)p;
}

// ---------------- Public Function Prototypes

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_nie__decoder__set_quirk_enabled(
    wuffs_nie__decoder* self,
    uint32_t a_quirk,
    bool a_enabled);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_nie__decoder__decode_image_config(
    wuffs_nie__decoder* self,
    wuffs_base__image_config* a_dst,
    wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_nie__decoder__decode_frame_config(
    wuffs_nie__decoder* self,
    wuffs_base__frame_config* a_dst,
    wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_nie__decoder__decode_frame(
    wuffs_nie__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__pixel_blend a_blend,
    wuffs_base__slice_u8 a_workbuf,
    wuffs_base__decode_frame_options* a_opts);

WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
wuffs_nie__decoder__frame_dirty_rect(
    const wuffs_nie__decoder* self);

WUFFS_BASE__MAYBE_STATIC uint32_t
wuffs_nie__decoder__num_animation_loops(
    const wuffs_nie__decoder* self);

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_nie__decoder__num_decoded_frame_configs(
    const wuffs_nie__decoder* self);

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_nie__decoder__num_decoded_frames(
    const wuffs_nie__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_nie__decoder__restart_frame(
    wuffs_nie__decoder* self,
    uint64_t a_index,
    uint64_t a_io_position);

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_nie__decoder__set_report_metadata(
    wuffs_nie__decoder* self,
    uint32_t a_fourcc,
    bool a_report);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_nie__decoder__tell_me_more(
    wuffs_nie__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__more_information* a_minfo,
    wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_nie__decoder__workbuf_len(
    const wuffs_nie__decoder* self);

// ---------------- Struct Definitions

// These structs' fields, and the sizeof them, are private implementation
// details that aren't guaranteed to be stable across Wuffs versions.
//
// See https://en.wikipedia.org/wiki/Opaque_pointer#C

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_nie__decoder__struct {
  // Do not access the private_impl's or private_data's fields directly. There
  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
  // the wuffs_foo__bar__baz functions.
  //
  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.

  struct {
    uint32_t magic;
    uint32_t active_coroutine;
    wuffs_base__vtable vtable_for__wuffs_base__image_decoder;
    wuffs_base__vtable null_vtable;

    uint32_t f_pixfmt;
    uint32_t f_width;
    uint32_t f_height;
    uint8_t f_call_sequence;
    uint32_t f_dst_x;
    uint32_t f_dst_y;
    wuffs_base__pixel_swizzler f_swizzler;

    uint32_t p_decode_image_config[1];
    uint32_t p_decode_frame_config[1];
    uint32_t p_decode_frame[1];
  } private_impl;

  struct {
    struct {
      uint64_t scratch;
    } s_decode_image_config[1];
  } private_data;

#ifdef __cplusplus
#if (__cplusplus >= 201103L)
  using unique_ptr = std::unique_ptr<wuffs_nie__decoder, decltype(&free)>;

  // On failure, the alloc_etc functions return nullptr. They don't throw.

  static inline unique_ptr
  alloc() {
    return unique_ptr(wuffs_nie__decoder__alloc(), &free);
  }

  static inline wuffs_base__image_decoder::unique_ptr
  alloc_as__wuffs_base__image_decoder() {
    return wuffs_base__image_decoder::unique_ptr(
        wuffs_nie__decoder__alloc_as__wuffs_base__image_decoder(), &free);
  }
#endif  // (__cplusplus >= 201103L)

#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
  // Disallow constructing or copying an object via standard C++ mechanisms,
  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
  // size and field layout is not part of the public, stable, memory-safe API.
  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
  // their first argument) rather than tweaking bar.private_impl.qux fields.
  //
  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
  // order to provide convenience methods. These forward on "this", so that you
  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
  wuffs_nie__decoder__struct() = delete;
  wuffs_nie__decoder__struct(const wuffs_nie__decoder__struct&) = delete;
  wuffs_nie__decoder__struct& operator=(
      const wuffs_nie__decoder__struct&) = delete;

  // As above, the size of the struct is not part of the public API, and unless
  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
  // allocated, not stack allocated. Its size is not intended to be known at
  // compile time, but it is unfortunately divulged as a side effect of
  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
  // instead of "sizeof T", invoking the operator. To make the two values
  // different, so that passing the latter will be rejected by the initialize
  // function, we add an arbitrary amount of dead weight.
  uint8_t dead_weight[123000000];  // 123 MB.
#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)

  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
  initialize(
      size_t sizeof_star_self,
      uint64_t wuffs_version,
      uint32_t options) {
    return wuffs_nie__decoder__initialize(
        this, sizeof_star_self, wuffs_version, options);
  }

  inline wuffs_base__image_decoder*
  upcast_as__wuffs_base__image_decoder() {
    return (wuffs_base__image_decoder*)this;
  }

  inline wuffs_base__empty_struct
  set_quirk_enabled(
      uint32_t a_quirk,
      bool a_enabled) {
    return wuffs_nie__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
  }

  inline wuffs_base__status
  decode_image_config(
      wuffs_base__image_config* a_dst,
      wuffs_base__io_buffer* a_src) {
    return wuffs_nie__decoder__decode_image_config(this, a_dst, a_src);
  }

  inline wuffs_base__status
  decode_frame_config(
      wuffs_base__frame_config* a_dst,
      wuffs_base__io_buffer* a_src) {
    return wuffs_nie__decoder__decode_frame_config(this, a_dst, a_src);
  }

  inline wuffs_base__status
  decode_frame(
      wuffs_base__pixel_buffer* a_dst,
      wuffs_base__io_buffer* a_src,
      wuffs_base__pixel_blend a_blend,
      wuffs_base__slice_u8 a_workbuf,
      wuffs_base__decode_frame_options* a_opts) {
    return wuffs_nie__decoder__decode_frame(this, a_dst, a_src, a_blend, a_workbuf, a_opts);
  }

  inline wuffs_base__rect_ie_u32
  frame_dirty_rect() const {
    return wuffs_nie__decoder__frame_dirty_rect(this);
  }

  inline uint32_t
  num_animation_loops() const {
    return wuffs_nie__decoder__num_animation_loops(this);
  }

  inline uint64_t
  num_decoded_frame_configs() const {
    return wuffs_nie__decoder__num_decoded_frame_configs(this);
  }

  inline uint64_t
  num_decoded_frames() const {
    return wuffs_nie__decoder__num_decoded_frames(this);
  }

  inline wuffs_base__status
  restart_frame(
      uint64_t a_index,
      uint64_t a_io_position) {
    return wuffs_nie__decoder__restart_frame(this, a_index, a_io_position);
  }

  inline wuffs_base__empty_struct
  set_report_metadata(
      uint32_t a_fourcc,
      bool a_report) {
    return wuffs_nie__decoder__set_report_metadata(this, a_fourcc, a_report);
  }

  inline wuffs_base__status
  tell_me_more(
      wuffs_base__io_buffer* a_dst,
      wuffs_base__more_information* a_minfo,
      wuffs_base__io_buffer* a_src) {
    return wuffs_nie__decoder__tell_me_more(this, a_dst, a_minfo, a_src);
  }

  inline wuffs_base__range_ii_u64
  workbuf_len() const {
    return wuffs_nie__decoder__workbuf_len(this);
  }

#endif  // __cplusplus
};  // struct wuffs_nie__decoder__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

#ifdef __cplusplus
}  // extern "C"
#endif

#ifdef __cplusplus
extern "C" {
#endif

// ---------------- Status Codes

extern const char wuffs_zlib__note__dictionary_required[];
extern const char wuffs_zlib__error__bad_checksum[];
extern const char wuffs_zlib__error__bad_compression_method[];
extern const char wuffs_zlib__error__bad_compression_window_size[];
extern const char wuffs_zlib__error__bad_parity_check[];
extern const char wuffs_zlib__error__incorrect_dictionary[];

// ---------------- Public Consts

#define WUFFS_ZLIB__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 1

// ---------------- Struct Declarations

typedef struct wuffs_zlib__decoder__struct wuffs_zlib__decoder;

// ---------------- Public Initializer Prototypes

// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
//
// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_zlib__decoder__initialize(
    wuffs_zlib__decoder* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options);

size_t
sizeof__wuffs_zlib__decoder();

// ---------------- Allocs

// These functions allocate and initialize Wuffs structs. They return NULL if
// memory allocation fails. If they return non-NULL, there is no need to call
// wuffs_foo__bar__initialize, but the caller is responsible for eventually
// calling free on the returned pointer. That pointer is effectively a C++
// std::unique_ptr<T, decltype(&free)>.

wuffs_zlib__decoder*
wuffs_zlib__decoder__alloc();

static inline wuffs_base__io_transformer*
wuffs_zlib__decoder__alloc_as__wuffs_base__io_transformer() {
  return (wuffs_base__io_transformer*)(wuffs_zlib__decoder__alloc());
}

// ---------------- Upcasts

static inline wuffs_base__io_transformer*
wuffs_zlib__decoder__upcast_as__wuffs_base__io_transformer(
    wuffs_zlib__decoder* p) {
  return (wuffs_base__io_transformer*)p;
}

// ---------------- Public Function Prototypes

WUFFS_BASE__MAYBE_STATIC uint32_t
wuffs_zlib__decoder__dictionary_id(
    const wuffs_zlib__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_zlib__decoder__add_dictionary(
    wuffs_zlib__decoder* self,
    wuffs_base__slice_u8 a_dict);

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_zlib__decoder__set_quirk_enabled(
    wuffs_zlib__decoder* self,
    uint32_t a_quirk,
    bool a_enabled);

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_zlib__decoder__workbuf_len(
    const wuffs_zlib__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_zlib__decoder__transform_io(
    wuffs_zlib__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__slice_u8 a_workbuf);

// ---------------- Struct Definitions

// These structs' fields, and the sizeof them, are private implementation
// details that aren't guaranteed to be stable across Wuffs versions.
//
// See https://en.wikipedia.org/wiki/Opaque_pointer#C

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_zlib__decoder__struct {
  // Do not access the private_impl's or private_data's fields directly. There
  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
  // the wuffs_foo__bar__baz functions.
  //
  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.

  struct {
    uint32_t magic;
    uint32_t active_coroutine;
    wuffs_base__vtable vtable_for__wuffs_base__io_transformer;
    wuffs_base__vtable null_vtable;

    bool f_bad_call_sequence;
    bool f_header_complete;
    bool f_got_dictionary;
    bool f_want_dictionary;
    bool f_ignore_checksum;
    uint32_t f_dict_id_got;
    uint32_t f_dict_id_want;

    uint32_t p_transform_io[1];
  } private_impl;

  struct {
    wuffs_adler32__hasher f_checksum;
    wuffs_adler32__hasher f_dict_id_hasher;
    wuffs_deflate__decoder f_flate;

    struct {
      uint32_t v_checksum_got;
      uint64_t scratch;
    } s_transform_io[1];
  } private_data;

#ifdef __cplusplus
#if (__cplusplus >= 201103L)
  using unique_ptr = std::unique_ptr<wuffs_zlib__decoder, decltype(&free)>;

  // On failure, the alloc_etc functions return nullptr. They don't throw.

  static inline unique_ptr
  alloc() {
    return unique_ptr(wuffs_zlib__decoder__alloc(), &free);
  }

  static inline wuffs_base__io_transformer::unique_ptr
  alloc_as__wuffs_base__io_transformer() {
    return wuffs_base__io_transformer::unique_ptr(
        wuffs_zlib__decoder__alloc_as__wuffs_base__io_transformer(), &free);
  }
#endif  // (__cplusplus >= 201103L)

#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
  // Disallow constructing or copying an object via standard C++ mechanisms,
  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
  // size and field layout is not part of the public, stable, memory-safe API.
  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
  // their first argument) rather than tweaking bar.private_impl.qux fields.
  //
  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
  // order to provide convenience methods. These forward on "this", so that you
  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
  wuffs_zlib__decoder__struct() = delete;
  wuffs_zlib__decoder__struct(const wuffs_zlib__decoder__struct&) = delete;
  wuffs_zlib__decoder__struct& operator=(
      const wuffs_zlib__decoder__struct&) = delete;

  // As above, the size of the struct is not part of the public API, and unless
  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
  // allocated, not stack allocated. Its size is not intended to be known at
  // compile time, but it is unfortunately divulged as a side effect of
  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
  // instead of "sizeof T", invoking the operator. To make the two values
  // different, so that passing the latter will be rejected by the initialize
  // function, we add an arbitrary amount of dead weight.
  uint8_t dead_weight[123000000];  // 123 MB.
#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)

  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
  initialize(
      size_t sizeof_star_self,
      uint64_t wuffs_version,
      uint32_t options) {
    return wuffs_zlib__decoder__initialize(
        this, sizeof_star_self, wuffs_version, options);
  }

  inline wuffs_base__io_transformer*
  upcast_as__wuffs_base__io_transformer() {
    return (wuffs_base__io_transformer*)this;
  }

  inline uint32_t
  dictionary_id() const {
    return wuffs_zlib__decoder__dictionary_id(this);
  }

  inline wuffs_base__empty_struct
  add_dictionary(
      wuffs_base__slice_u8 a_dict) {
    return wuffs_zlib__decoder__add_dictionary(this, a_dict);
  }

  inline wuffs_base__empty_struct
  set_quirk_enabled(
      uint32_t a_quirk,
      bool a_enabled) {
    return wuffs_zlib__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
  }

  inline wuffs_base__range_ii_u64
  workbuf_len() const {
    return wuffs_zlib__decoder__workbuf_len(this);
  }

  inline wuffs_base__status
  transform_io(
      wuffs_base__io_buffer* a_dst,
      wuffs_base__io_buffer* a_src,
      wuffs_base__slice_u8 a_workbuf) {
    return wuffs_zlib__decoder__transform_io(this, a_dst, a_src, a_workbuf);
  }

#endif  // __cplusplus
};  // struct wuffs_zlib__decoder__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

#ifdef __cplusplus
}  // extern "C"
#endif

#ifdef __cplusplus
extern "C" {
#endif

// ---------------- Status Codes

extern const char wuffs_png__error__bad_checksum[];
extern const char wuffs_png__error__bad_chunk[];
extern const char wuffs_png__error__bad_filter[];
extern const char wuffs_png__error__bad_header[];
extern const char wuffs_png__error__missing_palette[];
extern const char wuffs_png__error__unsupported_png_file[];

// ---------------- Public Consts

#define WUFFS_PNG__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 0

// ---------------- Struct Declarations

typedef struct wuffs_png__decoder__struct wuffs_png__decoder;

// ---------------- Public Initializer Prototypes

// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
//
// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_png__decoder__initialize(
    wuffs_png__decoder* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options);

size_t
sizeof__wuffs_png__decoder();

// ---------------- Allocs

// These functions allocate and initialize Wuffs structs. They return NULL if
// memory allocation fails. If they return non-NULL, there is no need to call
// wuffs_foo__bar__initialize, but the caller is responsible for eventually
// calling free on the returned pointer. That pointer is effectively a C++
// std::unique_ptr<T, decltype(&free)>.

wuffs_png__decoder*
wuffs_png__decoder__alloc();

static inline wuffs_base__image_decoder*
wuffs_png__decoder__alloc_as__wuffs_base__image_decoder() {
  return (wuffs_base__image_decoder*)(wuffs_png__decoder__alloc());
}

// ---------------- Upcasts

static inline wuffs_base__image_decoder*
wuffs_png__decoder__upcast_as__wuffs_base__image_decoder(
    wuffs_png__decoder* p) {
  return (wuffs_base__image_decoder*)p;
}

// ---------------- Public Function Prototypes

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_png__decoder__set_quirk_enabled(
    wuffs_png__decoder* self,
    uint32_t a_quirk,
    bool a_enabled);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_png__decoder__decode_image_config(
    wuffs_png__decoder* self,
    wuffs_base__image_config* a_dst,
    wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_png__decoder__decode_frame_config(
    wuffs_png__decoder* self,
    wuffs_base__frame_config* a_dst,
    wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_png__decoder__decode_frame(
    wuffs_png__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__pixel_blend a_blend,
    wuffs_base__slice_u8 a_workbuf,
    wuffs_base__decode_frame_options* a_opts);

WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
wuffs_png__decoder__frame_dirty_rect(
    const wuffs_png__decoder* self);

WUFFS_BASE__MAYBE_STATIC uint32_t
wuffs_png__decoder__num_animation_loops(
    const wuffs_png__decoder* self);

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_png__decoder__num_decoded_frame_configs(
    const wuffs_png__decoder* self);

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_png__decoder__num_decoded_frames(
    const wuffs_png__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_png__decoder__restart_frame(
    wuffs_png__decoder* self,
    uint64_t a_index,
    uint64_t a_io_position);

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_png__decoder__set_report_metadata(
    wuffs_png__decoder* self,
    uint32_t a_fourcc,
    bool a_report);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_png__decoder__tell_me_more(
    wuffs_png__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__more_information* a_minfo,
    wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_png__decoder__workbuf_len(
    const wuffs_png__decoder* self);

// ---------------- Struct Definitions

// These structs' fields, and the sizeof them, are private implementation
// details that aren't guaranteed to be stable across Wuffs versions.
//
// See https://en.wikipedia.org/wiki/Opaque_pointer#C

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_png__decoder__struct {
  // Do not access the private_impl's or private_data's fields directly. There
  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
  // the wuffs_foo__bar__baz functions.
  //
  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.

  struct {
    uint32_t magic;
    uint32_t active_coroutine;
    wuffs_base__vtable vtable_for__wuffs_base__image_decoder;
    wuffs_base__vtable null_vtable;

    uint32_t f_width;
    uint32_t f_height;
    uint64_t f_pass_bytes_per_row;
    uint64_t f_workbuf_wi;
    uint64_t f_overall_workbuf_length;
    uint64_t f_pass_workbuf_length;
    uint8_t f_call_sequence;
    bool f_ignore_checksum;
    uint8_t f_depth;
    uint8_t f_color_type;
    uint8_t f_filter_distance;
    uint8_t f_interlace_pass;
    bool f_seen_plte;
    bool f_seen_trns;
    uint32_t f_dst_pixfmt;
    uint32_t f_src_pixfmt;
    uint32_t f_chunk_type;
    uint8_t f_chunk_type_array[4];
    uint64_t f_chunk_length;
    uint64_t f_frame_config_io_position;
    wuffs_base__pixel_swizzler f_swizzler;

    wuffs_base__empty_struct (*choosy_filter_1)(
        wuffs_png__decoder* self,
        wuffs_base__slice_u8 a_curr);
    wuffs_base__empty_struct (*choosy_filter_3)(
        wuffs_png__decoder* self,
        wuffs_base__slice_u8 a_curr,
        wuffs_base__slice_u8 a_prev);
    wuffs_base__empty_struct (*choosy_filter_4)(
        wuffs_png__decoder* self,
        wuffs_base__slice_u8 a_curr,
        wuffs_base__slice_u8 a_prev);
    uint32_t p_decode_image_config[1];
    uint32_t p_decode_ihdr[1];
    uint32_t p_decode_other_chunk[1];
    uint32_t p_decode_plte[1];
    uint32_t p_decode_trns[1];
    uint32_t p_decode_frame_config[1];
    uint32_t p_decode_frame[1];
    uint32_t p_decode_pass[1];
    wuffs_base__status (*choosy_filter_and_swizzle)(
        wuffs_png__decoder* self,
        wuffs_base__pixel_buffer* a_dst,
        wuffs_base__slice_u8 a_workbuf);
  } private_impl;

  struct {
    wuffs_crc32__ieee_hasher f_crc32;
    wuffs_zlib__decoder f_zlib;
    uint8_t f_dst_palette[1024];
    uint8_t f_src_palette[1024];

    struct {
      uint32_t v_checksum_have;
      uint64_t scratch;
    } s_decode_image_config[1];
    struct {
      uint64_t scratch;
    } s_decode_ihdr[1];
    struct {
      uint64_t scratch;
    } s_decode_other_chunk[1];
    struct {
      uint32_t v_num_entries;
      uint32_t v_i;
      uint64_t scratch;
    } s_decode_plte[1];
    struct {
      uint32_t v_num_entries;
      uint32_t v_i;
    } s_decode_trns[1];
    struct {
      uint32_t v_checksum_have;
      uint64_t scratch;
    } s_decode_pass[1];
  } private_data;

#ifdef __cplusplus
#if (__cplusplus >= 201103L)
  using unique_ptr = std::unique_ptr<wuffs_png__decoder, decltype(&free)>;

  // On failure, the alloc_etc functions return nullptr. They don't throw.

  static inline unique_ptr
  alloc() {
    return unique_ptr(wuffs_png__decoder__alloc(), &free);
  }

  static inline wuffs_base__image_decoder::unique_ptr
  alloc_as__wuffs_base__image_decoder() {
    return wuffs_base__image_decoder::unique_ptr(
        wuffs_png__decoder__alloc_as__wuffs_base__image_decoder(), &free);
  }
#endif  // (__cplusplus >= 201103L)

#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
  // Disallow constructing or copying an object via standard C++ mechanisms,
  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
  // size and field layout is not part of the public, stable, memory-safe API.
  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
  // their first argument) rather than tweaking bar.private_impl.qux fields.
  //
  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
  // order to provide convenience methods. These forward on "this", so that you
  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
  wuffs_png__decoder__struct() = delete;
  wuffs_png__decoder__struct(const wuffs_png__decoder__struct&) = delete;
  wuffs_png__decoder__struct& operator=(
      const wuffs_png__decoder__struct&) = delete;

  // As above, the size of the struct is not part of the public API, and unless
  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
  // allocated, not stack allocated. Its size is not intended to be known at
  // compile time, but it is unfortunately divulged as a side effect of
  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
  // instead of "sizeof T", invoking the operator. To make the two values
  // different, so that passing the latter will be rejected by the initialize
  // function, we add an arbitrary amount of dead weight.
  uint8_t dead_weight[123000000];  // 123 MB.
#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)

  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
  initialize(
      size_t sizeof_star_self,
      uint64_t wuffs_version,
      uint32_t options) {
    return wuffs_png__decoder__initialize(
        this, sizeof_star_self, wuffs_version, options);
  }

  inline wuffs_base__image_decoder*
  upcast_as__wuffs_base__image_decoder() {
    return (wuffs_base__image_decoder*)this;
  }

  inline wuffs_base__empty_struct
  set_quirk_enabled(
      uint32_t a_quirk,
      bool a_enabled) {
    return wuffs_png__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
  }

  inline wuffs_base__status
  decode_image_config(
      wuffs_base__image_config* a_dst,
      wuffs_base__io_buffer* a_src) {
    return wuffs_png__decoder__decode_image_config(this, a_dst, a_src);
  }

  inline wuffs_base__status
  decode_frame_config(
      wuffs_base__frame_config* a_dst,
      wuffs_base__io_buffer* a_src) {
    return wuffs_png__decoder__decode_frame_config(this, a_dst, a_src);
  }

  inline wuffs_base__status
  decode_frame(
      wuffs_base__pixel_buffer* a_dst,
      wuffs_base__io_buffer* a_src,
      wuffs_base__pixel_blend a_blend,
      wuffs_base__slice_u8 a_workbuf,
      wuffs_base__decode_frame_options* a_opts) {
    return wuffs_png__decoder__decode_frame(this, a_dst, a_src, a_blend, a_workbuf, a_opts);
  }

  inline wuffs_base__rect_ie_u32
  frame_dirty_rect() const {
    return wuffs_png__decoder__frame_dirty_rect(this);
  }

  inline uint32_t
  num_animation_loops() const {
    return wuffs_png__decoder__num_animation_loops(this);
  }

  inline uint64_t
  num_decoded_frame_configs() const {
    return wuffs_png__decoder__num_decoded_frame_configs(this);
  }

  inline uint64_t
  num_decoded_frames() const {
    return wuffs_png__decoder__num_decoded_frames(this);
  }

  inline wuffs_base__status
  restart_frame(
      uint64_t a_index,
      uint64_t a_io_position) {
    return wuffs_png__decoder__restart_frame(this, a_index, a_io_position);
  }

  inline wuffs_base__empty_struct
  set_report_metadata(
      uint32_t a_fourcc,
      bool a_report) {
    return wuffs_png__decoder__set_report_metadata(this, a_fourcc, a_report);
  }

  inline wuffs_base__status
  tell_me_more(
      wuffs_base__io_buffer* a_dst,
      wuffs_base__more_information* a_minfo,
      wuffs_base__io_buffer* a_src) {
    return wuffs_png__decoder__tell_me_more(this, a_dst, a_minfo, a_src);
  }

  inline wuffs_base__range_ii_u64
  workbuf_len() const {
    return wuffs_png__decoder__workbuf_len(this);
  }

#endif  // __cplusplus
};  // struct wuffs_png__decoder__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

#ifdef __cplusplus
}  // extern "C"
#endif

#ifdef __cplusplus
extern "C" {
#endif

// ---------------- Status Codes

extern const char wuffs_wbmp__error__bad_header[];

// ---------------- Public Consts

#define WUFFS_WBMP__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 0

// ---------------- Struct Declarations

typedef struct wuffs_wbmp__decoder__struct wuffs_wbmp__decoder;

// ---------------- Public Initializer Prototypes

// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
//
// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_wbmp__decoder__initialize(
    wuffs_wbmp__decoder* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options);

size_t
sizeof__wuffs_wbmp__decoder();

// ---------------- Allocs

// These functions allocate and initialize Wuffs structs. They return NULL if
// memory allocation fails. If they return non-NULL, there is no need to call
// wuffs_foo__bar__initialize, but the caller is responsible for eventually
// calling free on the returned pointer. That pointer is effectively a C++
// std::unique_ptr<T, decltype(&free)>.

wuffs_wbmp__decoder*
wuffs_wbmp__decoder__alloc();

static inline wuffs_base__image_decoder*
wuffs_wbmp__decoder__alloc_as__wuffs_base__image_decoder() {
  return (wuffs_base__image_decoder*)(wuffs_wbmp__decoder__alloc());
}

// ---------------- Upcasts

static inline wuffs_base__image_decoder*
wuffs_wbmp__decoder__upcast_as__wuffs_base__image_decoder(
    wuffs_wbmp__decoder* p) {
  return (wuffs_base__image_decoder*)p;
}

// ---------------- Public Function Prototypes

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_wbmp__decoder__set_quirk_enabled(
    wuffs_wbmp__decoder* self,
    uint32_t a_quirk,
    bool a_enabled);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_wbmp__decoder__decode_image_config(
    wuffs_wbmp__decoder* self,
    wuffs_base__image_config* a_dst,
    wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_wbmp__decoder__decode_frame_config(
    wuffs_wbmp__decoder* self,
    wuffs_base__frame_config* a_dst,
    wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_wbmp__decoder__decode_frame(
    wuffs_wbmp__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__pixel_blend a_blend,
    wuffs_base__slice_u8 a_workbuf,
    wuffs_base__decode_frame_options* a_opts);

WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
wuffs_wbmp__decoder__frame_dirty_rect(
    const wuffs_wbmp__decoder* self);

WUFFS_BASE__MAYBE_STATIC uint32_t
wuffs_wbmp__decoder__num_animation_loops(
    const wuffs_wbmp__decoder* self);

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_wbmp__decoder__num_decoded_frame_configs(
    const wuffs_wbmp__decoder* self);

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_wbmp__decoder__num_decoded_frames(
    const wuffs_wbmp__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_wbmp__decoder__restart_frame(
    wuffs_wbmp__decoder* self,
    uint64_t a_index,
    uint64_t a_io_position);

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_wbmp__decoder__set_report_metadata(
    wuffs_wbmp__decoder* self,
    uint32_t a_fourcc,
    bool a_report);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_wbmp__decoder__tell_me_more(
    wuffs_wbmp__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__more_information* a_minfo,
    wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_wbmp__decoder__workbuf_len(
    const wuffs_wbmp__decoder* self);

// ---------------- Struct Definitions

// These structs' fields, and the sizeof them, are private implementation
// details that aren't guaranteed to be stable across Wuffs versions.
//
// See https://en.wikipedia.org/wiki/Opaque_pointer#C

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_wbmp__decoder__struct {
  // Do not access the private_impl's or private_data's fields directly. There
  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
  // the wuffs_foo__bar__baz functions.
  //
  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.

  struct {
    uint32_t magic;
    uint32_t active_coroutine;
    wuffs_base__vtable vtable_for__wuffs_base__image_decoder;
    wuffs_base__vtable null_vtable;

    uint32_t f_width;
    uint32_t f_height;
    uint8_t f_call_sequence;
    uint64_t f_frame_config_io_position;
    wuffs_base__pixel_swizzler f_swizzler;

    uint32_t p_decode_image_config[1];
    uint32_t p_decode_frame_config[1];
    uint32_t p_decode_frame[1];
  } private_impl;

  struct {
    struct {
      uint32_t v_i;
      uint32_t v_x32;
    } s_decode_image_config[1];
    struct {
      uint64_t v_dst_bytes_per_pixel;
      uint32_t v_dst_x;
      uint32_t v_dst_y;
      uint8_t v_src[1];
      uint8_t v_c;
    } s_decode_frame[1];
  } private_data;

#ifdef __cplusplus
#if (__cplusplus >= 201103L)
  using unique_ptr = std::unique_ptr<wuffs_wbmp__decoder, decltype(&free)>;

  // On failure, the alloc_etc functions return nullptr. They don't throw.

  static inline unique_ptr
  alloc() {
    return unique_ptr(wuffs_wbmp__decoder__alloc(), &free);
  }

  static inline wuffs_base__image_decoder::unique_ptr
  alloc_as__wuffs_base__image_decoder() {
    return wuffs_base__image_decoder::unique_ptr(
        wuffs_wbmp__decoder__alloc_as__wuffs_base__image_decoder(), &free);
  }
#endif  // (__cplusplus >= 201103L)

#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
  // Disallow constructing or copying an object via standard C++ mechanisms,
  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
  // size and field layout is not part of the public, stable, memory-safe API.
  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
  // their first argument) rather than tweaking bar.private_impl.qux fields.
  //
  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
  // order to provide convenience methods. These forward on "this", so that you
  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
  wuffs_wbmp__decoder__struct() = delete;
  wuffs_wbmp__decoder__struct(const wuffs_wbmp__decoder__struct&) = delete;
  wuffs_wbmp__decoder__struct& operator=(
      const wuffs_wbmp__decoder__struct&) = delete;

  // As above, the size of the struct is not part of the public API, and unless
  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
  // allocated, not stack allocated. Its size is not intended to be known at
  // compile time, but it is unfortunately divulged as a side effect of
  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
  // instead of "sizeof T", invoking the operator. To make the two values
  // different, so that passing the latter will be rejected by the initialize
  // function, we add an arbitrary amount of dead weight.
  uint8_t dead_weight[123000000];  // 123 MB.
#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)

  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
  initialize(
      size_t sizeof_star_self,
      uint64_t wuffs_version,
      uint32_t options) {
    return wuffs_wbmp__decoder__initialize(
        this, sizeof_star_self, wuffs_version, options);
  }

  inline wuffs_base__image_decoder*
  upcast_as__wuffs_base__image_decoder() {
    return (wuffs_base__image_decoder*)this;
  }

  inline wuffs_base__empty_struct
  set_quirk_enabled(
      uint32_t a_quirk,
      bool a_enabled) {
    return wuffs_wbmp__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
  }

  inline wuffs_base__status
  decode_image_config(
      wuffs_base__image_config* a_dst,
      wuffs_base__io_buffer* a_src) {
    return wuffs_wbmp__decoder__decode_image_config(this, a_dst, a_src);
  }

  inline wuffs_base__status
  decode_frame_config(
      wuffs_base__frame_config* a_dst,
      wuffs_base__io_buffer* a_src) {
    return wuffs_wbmp__decoder__decode_frame_config(this, a_dst, a_src);
  }

  inline wuffs_base__status
  decode_frame(
      wuffs_base__pixel_buffer* a_dst,
      wuffs_base__io_buffer* a_src,
      wuffs_base__pixel_blend a_blend,
      wuffs_base__slice_u8 a_workbuf,
      wuffs_base__decode_frame_options* a_opts) {
    return wuffs_wbmp__decoder__decode_frame(this, a_dst, a_src, a_blend, a_workbuf, a_opts);
  }

  inline wuffs_base__rect_ie_u32
  frame_dirty_rect() const {
    return wuffs_wbmp__decoder__frame_dirty_rect(this);
  }

  inline uint32_t
  num_animation_loops() const {
    return wuffs_wbmp__decoder__num_animation_loops(this);
  }

  inline uint64_t
  num_decoded_frame_configs() const {
    return wuffs_wbmp__decoder__num_decoded_frame_configs(this);
  }

  inline uint64_t
  num_decoded_frames() const {
    return wuffs_wbmp__decoder__num_decoded_frames(this);
  }

  inline wuffs_base__status
  restart_frame(
      uint64_t a_index,
      uint64_t a_io_position) {
    return wuffs_wbmp__decoder__restart_frame(this, a_index, a_io_position);
  }

  inline wuffs_base__empty_struct
  set_report_metadata(
      uint32_t a_fourcc,
      bool a_report) {
    return wuffs_wbmp__decoder__set_report_metadata(this, a_fourcc, a_report);
  }

  inline wuffs_base__status
  tell_me_more(
      wuffs_base__io_buffer* a_dst,
      wuffs_base__more_information* a_minfo,
      wuffs_base__io_buffer* a_src) {
    return wuffs_wbmp__decoder__tell_me_more(this, a_dst, a_minfo, a_src);
  }

  inline wuffs_base__range_ii_u64
  workbuf_len() const {
    return wuffs_wbmp__decoder__workbuf_len(this);
  }

#endif  // __cplusplus
};  // struct wuffs_wbmp__decoder__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

#ifdef __cplusplus
}  // extern "C"
#endif

#if defined(__cplusplus) && (__cplusplus >= 201103L)

// ---------------- Auxiliary - Base

// Auxiliary code is discussed at
// https://github.com/google/wuffs/blob/main/doc/note/auxiliary-code.md

#include <stdio.h>

#include <string>

namespace wuffs_aux {

using IOBuffer = wuffs_base__io_buffer;

// MemOwner represents ownership of some memory. Dynamically allocated memory
// (e.g. from malloc or new) is typically paired with free or delete, invoked
// when the std::unique_ptr is destroyed. Statically allocated memory might use
// MemOwner(nullptr, &free), even if that statically allocated memory is not
// nullptr, since calling free(nullptr) is a no-op.
using MemOwner = std::unique_ptr<void, decltype(&free)>;

namespace sync_io {

// --------

class Input {
 public:
  virtual IOBuffer* BringsItsOwnIOBuffer();
  virtual std::string CopyIn(IOBuffer* dst) = 0;
};

// --------

// FileInput is an Input that reads from a file source.
//
// It does not take responsibility for closing the file when done.
class FileInput : public Input {
 public:
  FileInput(FILE* f);

  virtual std::string CopyIn(IOBuffer* dst);

 private:
  FILE* m_f;

  // Delete the copy and assign constructors.
  FileInput(const FileInput&) = delete;
  FileInput& operator=(const FileInput&) = delete;
};

// --------

// MemoryInput is an Input that reads from an in-memory source.
//
// It does not take responsibility for freeing the memory when done.
class MemoryInput : public Input {
 public:
  MemoryInput(const char* ptr, size_t len);
  MemoryInput(const uint8_t* ptr, size_t len);

  virtual IOBuffer* BringsItsOwnIOBuffer();
  virtual std::string CopyIn(IOBuffer* dst);

 private:
  IOBuffer m_io;

  // Delete the copy and assign constructors.
  MemoryInput(const MemoryInput&) = delete;
  MemoryInput& operator=(const MemoryInput&) = delete;
};

// --------

}  // namespace sync_io

}  // namespace wuffs_aux

// ---------------- Auxiliary - CBOR

namespace wuffs_aux {

struct DecodeCborResult {
  DecodeCborResult(std::string&& error_message0, uint64_t cursor_position0);

  std::string error_message;
  uint64_t cursor_position;
};

class DecodeCborCallbacks {
 public:
  // AppendXxx are called for leaf nodes: literals, numbers, strings, etc.

  virtual std::string AppendNull() = 0;
  virtual std::string AppendUndefined() = 0;
  virtual std::string AppendBool(bool val) = 0;
  virtual std::string AppendF64(double val) = 0;
  virtual std::string AppendI64(int64_t val) = 0;
  virtual std::string AppendU64(uint64_t val) = 0;
  virtual std::string AppendByteString(std::string&& val) = 0;
  virtual std::string AppendTextString(std::string&& val) = 0;
  virtual std::string AppendMinus1MinusX(uint64_t val) = 0;
  virtual std::string AppendCborSimpleValue(uint8_t val) = 0;
  virtual std::string AppendCborTag(uint64_t val) = 0;

  // Push and Pop are called for container nodes: CBOR arrays (lists) and CBOR
  // maps (dictionaries).
  //
  // The flags bits combine exactly one of:
  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__FROM_NONE
  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__FROM_LIST
  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__FROM_DICT
  // and exactly one of:
  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__TO_NONE
  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__TO_LIST
  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__TO_DICT

  virtual std::string Push(uint32_t flags) = 0;
  virtual std::string Pop(uint32_t flags) = 0;

  // Done is always the last Callback method called by DecodeCbor, whether or
  // not parsing the input as CBOR encountered an error. Even when successful,
  // trailing data may remain in input and buffer.
  //
  // Do not keep a reference to buffer or buffer.data.ptr after Done returns,
  // as DecodeCbor may then de-allocate the backing array.
  //
  // The default Done implementation is a no-op.
  virtual void  //
  Done(DecodeCborResult& result, sync_io::Input& input, IOBuffer& buffer);
};

// DecodeCbor calls callbacks based on the CBOR-formatted data in input.
//
// On success, the returned error_message is empty and cursor_position counts
// the number of bytes consumed. On failure, error_message is non-empty and
// cursor_position is the location of the error. That error may be a content
// error (invalid CBOR) or an input error (e.g. network failure).
DecodeCborResult  //
DecodeCbor(DecodeCborCallbacks& callbacks,
           sync_io::Input& input,
           wuffs_base__slice_u32 quirks = wuffs_base__empty_slice_u32());

}  // namespace wuffs_aux

// ---------------- Auxiliary - Image

namespace wuffs_aux {

struct DecodeImageResult {
  DecodeImageResult(MemOwner&& pixbuf_mem_owner0,
                    wuffs_base__slice_u8 pixbuf_mem_slice0,
                    wuffs_base__pixel_buffer pixbuf0,
                    std::string&& error_message0);
  DecodeImageResult(std::string&& error_message0);

  MemOwner pixbuf_mem_owner;
  wuffs_base__slice_u8 pixbuf_mem_slice;
  wuffs_base__pixel_buffer pixbuf;
  std::string error_message;
};

// DecodeImageCallbacks are the callbacks given to DecodeImage. They are always
// called in this order:
//  1. OnImageFormat
//  2. OnImageConfig
//  3. AllocWorkbuf
//  4. Done
//
// It may return early - the third callback might not be invoked if the second
// one fails (returns a non-empty error message) - but the final callback
// (Done) is always invoked.
class DecodeImageCallbacks {
 public:
  // AllocResult holds a memory allocation (the result of malloc or new, a
  // statically allocated pointer, etc), or an error message. The memory is
  // de-allocated when mem_owner goes out of scope and is destroyed.
  struct AllocResult {
    AllocResult(MemOwner&& mem_owner0, wuffs_base__slice_u8 mem_slice0);
    AllocResult(std::string&& error_message0);

    MemOwner mem_owner;
    wuffs_base__slice_u8 mem_slice;
    std::string error_message;
  };

  // OnImageFormat returns the image decoder for the input data's file format.
  // Returning a nullptr means failure (DecodeImage_UnsupportedImageFormat).
  //
  // Common formats will have a non-zero FourCC value, such as
  // WUFFS_BASE__FOURCC__JPEG. A zero FourCC code means that the caller is
  // responsible for examining the opening bytes (a prefix) of the input data.
  // OnImageFormat implementations should not modify those bytes.
  //
  // OnImageFormat might be called more than once, since some image file
  // formats can wrap others. For example, a nominal BMP file can actually
  // contain a JPEG or a PNG.
  //
  // There is no default implementation, as modular Wuffs builds (those that
  // define WUFFS_CONFIG__MODULES) may enable or disable particular codecs.
  virtual wuffs_base__image_decoder::unique_ptr  //
  OnImageFormat(uint32_t fourcc, wuffs_base__slice_u8 prefix) = 0;

  // OnImageConfig allocates the pixel buffer.
  //
  // The default OnImageConfig implementation allocates zeroed memory.
  virtual AllocResult  //
  OnImageConfig(const wuffs_base__image_config& image_config);

  // AllocWorkbuf allocates the work buffer. The allocated buffer's length
  // should be at least len.min_incl, but larger allocations (up to
  // len.max_incl) may have better performance (by using more memory).
  //
  // The default AllocWorkbuf implementation allocates len.max_incl bytes of
  // zeroed memory.
  virtual AllocResult  //
  AllocWorkbuf(wuffs_base__range_ii_u64 len);

  // Done is always the last Callback method called by DecodeImage, whether or
  // not parsing the input encountered an error. Even when successful, trailing
  // data may remain in input and buffer.
  //
  // The image_decoder is the one returned by OnImageFormat (if OnImageFormat
  // was successful), or a no-op unique_ptr otherwise. Like any unique_ptr,
  // ownership moves to the Done implementation.
  //
  // Do not keep a reference to buffer or buffer.data.ptr after Done returns,
  // as DecodeImage may then de-allocate the backing array.
  //
  // The default Done implementation is a no-op, other than running the
  // image_decoder unique_ptr destructor.
  virtual void  //
  Done(DecodeImageResult& result,
       sync_io::Input& input,
       IOBuffer& buffer,
       wuffs_base__image_decoder::unique_ptr image_decoder);
};

extern const char DecodeImage_BufferIsTooShort[];
extern const char DecodeImage_MaxInclDimensionExceeded[];
extern const char DecodeImage_OutOfMemory[];
extern const char DecodeImage_UnexpectedEndOfFile[];
extern const char DecodeImage_UnsupportedImageFormat[];
extern const char DecodeImage_UnsupportedPixelBlend[];
extern const char DecodeImage_UnsupportedPixelConfiguration[];
extern const char DecodeImage_UnsupportedPixelFormat[];

// DecodeImage decodes the image data in input. A variety of image file formats
// can be decoded, depending on what callbacks.OnImageFormat returns. For
// animated formats, only the first frame is returned.
//
//  - On total success, the returned error_message is empty.
//  - On partial success (e.g. the input file was truncated but we are still
//    able to decode some pixels), error_message is non-empty but the returned
//    pixbuf.pixcfg.is_valid() is true.
//  - On failure, the error_message is non_empty and pixbuf.pixcfg.is_valid()
//    is false.
//
// The callbacks allocate the pixel buffer memory and work buffer memory. On
// success, pixel buffer memory ownership is passed to the DecodeImage caller
// as the returned pixbuf_mem_owner. Regardless of success or failure, the work
// buffer memory is deleted.
//
// If override_pixel_format_repr is zero then the pixel buffer will have the
// image file's natural pixel format. For example, GIF images' natural pixel
// format is an indexed one.
//
// If override_pixel_format_repr is non-zero (and one of the constants listed
// below) then the image will be decoded to that particular pixel format:
//  - WUFFS_BASE__PIXEL_FORMAT__BGR_565
//  - WUFFS_BASE__PIXEL_FORMAT__BGR
//  - WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL
//  - WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL
//
// The pixel_blend (one of the constants listed below) determines how to
// composite the decoded image over the pixel buffer's original pixels (as
// returned by callbacks.OnImageConfig):
//  - WUFFS_BASE__PIXEL_BLEND__SRC
//  - WUFFS_BASE__PIXEL_BLEND__SRC_OVER
//
// Decoding fails (with DecodeImage_MaxInclDimensionExceeded) if the image's
// width or height is greater than max_incl_dimension.
DecodeImageResult  //
DecodeImage(DecodeImageCallbacks& callbacks,
            sync_io::Input& input,
            uint32_t override_pixel_format_repr,
            wuffs_base__pixel_blend pixel_blend = WUFFS_BASE__PIXEL_BLEND__SRC,
            uint32_t max_incl_dimension = 1048575);  // 0x000F_FFFF

}  // namespace wuffs_aux

// ---------------- Auxiliary - JSON

namespace wuffs_aux {

struct DecodeJsonResult {
  DecodeJsonResult(std::string&& error_message0, uint64_t cursor_position0);

  std::string error_message;
  uint64_t cursor_position;
};

class DecodeJsonCallbacks {
 public:
  // AppendXxx are called for leaf nodes: literals, numbers and strings. For
  // strings, the Callbacks implementation is responsible for tracking map keys
  // versus other values.

  virtual std::string AppendNull() = 0;
  virtual std::string AppendBool(bool val) = 0;
  virtual std::string AppendF64(double val) = 0;
  virtual std::string AppendI64(int64_t val) = 0;
  virtual std::string AppendTextString(std::string&& val) = 0;

  // Push and Pop are called for container nodes: JSON arrays (lists) and JSON
  // objects (dictionaries).
  //
  // The flags bits combine exactly one of:
  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__FROM_NONE
  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__FROM_LIST
  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__FROM_DICT
  // and exactly one of:
  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__TO_NONE
  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__TO_LIST
  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__TO_DICT

  virtual std::string Push(uint32_t flags) = 0;
  virtual std::string Pop(uint32_t flags) = 0;

  // Done is always the last Callback method called by DecodeJson, whether or
  // not parsing the input as JSON encountered an error. Even when successful,
  // trailing data may remain in input and buffer. See "Unintuitive JSON
  // Parsing" (https://nullprogram.com/blog/2019/12/28/) which discusses JSON
  // parsing and when it stops.
  //
  // Do not keep a reference to buffer or buffer.data.ptr after Done returns,
  // as DecodeJson may then de-allocate the backing array.
  //
  // The default Done implementation is a no-op.
  virtual void  //
  Done(DecodeJsonResult& result, sync_io::Input& input, IOBuffer& buffer);
};

extern const char DecodeJson_BadJsonPointer[];
extern const char DecodeJson_NoMatch[];

// DecodeJson calls callbacks based on the JSON-formatted data in input.
//
// On success, the returned error_message is empty and cursor_position counts
// the number of bytes consumed. On failure, error_message is non-empty and
// cursor_position is the location of the error. That error may be a content
// error (invalid JSON) or an input error (e.g. network failure).
//
// json_pointer is a query in the JSON Pointer (RFC 6901) syntax. The callbacks
// run for the input's sub-node that matches the query. DecodeJson_NoMatch is
// returned if no matching sub-node was found. The empty query matches the
// input's root node, consistent with JSON Pointer semantics.
//
// The JSON Pointer implementation is greedy: duplicate keys are not rejected
// but only the first match for each '/'-separated fragment is followed.
DecodeJsonResult  //
DecodeJson(DecodeJsonCallbacks& callbacks,
           sync_io::Input& input,
           wuffs_base__slice_u32 quirks = wuffs_base__empty_slice_u32(),
           std::string json_pointer = std::string());

}  // namespace wuffs_aux

#endif  // defined(__cplusplus) && (__cplusplus >= 201103L)

// WUFFS C HEADER ENDS HERE.
#ifdef WUFFS_IMPLEMENTATION

#ifdef __cplusplus
extern "C" {
#endif

// ---------------- Fundamentals

// WUFFS_BASE__MAGIC is a magic number to check that initializers are called.
// It's not foolproof, given C doesn't automatically zero memory before use,
// but it should catch 99.99% of cases.
//
// Its (non-zero) value is arbitrary, based on md5sum("wuffs").
#define WUFFS_BASE__MAGIC ((uint32_t)0x3CCB6C71)

// WUFFS_BASE__DISABLED is a magic number to indicate that a non-recoverable
// error was previously encountered.
//
// Its (non-zero) value is arbitrary, based on md5sum("disabled").
#define WUFFS_BASE__DISABLED ((uint32_t)0x075AE3D2)

// Denote intentional fallthroughs for -Wimplicit-fallthrough.
//
// The order matters here. Clang also defines "__GNUC__".
#if defined(__clang__) && defined(__cplusplus) && (__cplusplus >= 201103L)
#define WUFFS_BASE__FALLTHROUGH [[clang::fallthrough]]
#elif !defined(__clang__) && defined(__GNUC__) && (__GNUC__ >= 7)
#define WUFFS_BASE__FALLTHROUGH __attribute__((fallthrough))
#else
#define WUFFS_BASE__FALLTHROUGH
#endif

// Use switch cases for coroutine suspension points, similar to the technique
// in https://www.chiark.greenend.org.uk/~sgtatham/coroutines.html
//
// We use trivial macros instead of an explicit assignment and case statement
// so that clang-format doesn't get confused by the unusual "case"s.
#define WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0 case 0:;
#define WUFFS_BASE__COROUTINE_SUSPENSION_POINT(n) \
  coro_susp_point = n;                            \
  WUFFS_BASE__FALLTHROUGH;                        \
  case n:;

#define WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(n) \
  if (!status.repr) {                                           \
    goto ok;                                                    \
  } else if (*status.repr != '$') {                             \
    goto exit;                                                  \
  }                                                             \
  coro_susp_point = n;                                          \
  goto suspend;                                                 \
  case n:;

// Clang also defines "__GNUC__".
#if defined(__GNUC__)
#define WUFFS_BASE__LIKELY(expr) (__builtin_expect(!!(expr), 1))
#define WUFFS_BASE__UNLIKELY(expr) (__builtin_expect(!!(expr), 0))
#else
#define WUFFS_BASE__LIKELY(expr) (expr)
#define WUFFS_BASE__UNLIKELY(expr) (expr)
#endif

// --------

static inline wuffs_base__empty_struct  //
wuffs_base__ignore_status(wuffs_base__status z) {
  return wuffs_base__make_empty_struct();
}

static inline wuffs_base__status  //
wuffs_base__status__ensure_not_a_suspension(wuffs_base__status z) {
  if (z.repr && (*z.repr == '$')) {
    z.repr = wuffs_base__error__cannot_return_a_suspension;
  }
  return z;
}

// --------

// wuffs_base__iterate_total_advance returns the exclusive pointer-offset at
// which iteration should stop. The overall slice has length total_len, each
// iteration's sub-slice has length iter_len and are placed iter_advance apart.
//
// The iter_advance may not be larger than iter_len. The iter_advance may be
// smaller than iter_len, in which case the sub-slices will overlap.
//
// The return value r satisfies ((0 <= r) && (r <= total_len)).
//
// For example, if total_len = 15, iter_len = 5 and iter_advance = 3, there are
// four iterations at offsets 0, 3, 6 and 9. This function returns 12.
//
// 0123456789012345
// [....]
//    [....]
//       [....]
//          [....]
//             $
// 0123456789012345
//
// For example, if total_len = 15, iter_len = 5 and iter_advance = 5, there are
// three iterations at offsets 0, 5 and 10. This function returns 15.
//
// 0123456789012345
// [....]
//      [....]
//           [....]
//                $
// 0123456789012345
static inline size_t  //
wuffs_base__iterate_total_advance(size_t total_len,
                                  size_t iter_len,
                                  size_t iter_advance) {
  if (total_len >= iter_len) {
    size_t n = total_len - iter_len;
    return ((n / iter_advance) * iter_advance) + iter_advance;
  }
  return 0;
}

// ---------------- Numeric Types

extern const uint8_t wuffs_base__low_bits_mask__u8[9];
extern const uint16_t wuffs_base__low_bits_mask__u16[17];
extern const uint32_t wuffs_base__low_bits_mask__u32[33];
extern const uint64_t wuffs_base__low_bits_mask__u64[65];

#define WUFFS_BASE__LOW_BITS_MASK__U8(n) (wuffs_base__low_bits_mask__u8[n])
#define WUFFS_BASE__LOW_BITS_MASK__U16(n) (wuffs_base__low_bits_mask__u16[n])
#define WUFFS_BASE__LOW_BITS_MASK__U32(n) (wuffs_base__low_bits_mask__u32[n])
#define WUFFS_BASE__LOW_BITS_MASK__U64(n) (wuffs_base__low_bits_mask__u64[n])

// --------

static inline void  //
wuffs_base__u8__sat_add_indirect(uint8_t* x, uint8_t y) {
  *x = wuffs_base__u8__sat_add(*x, y);
}

static inline void  //
wuffs_base__u8__sat_sub_indirect(uint8_t* x, uint8_t y) {
  *x = wuffs_base__u8__sat_sub(*x, y);
}

static inline void  //
wuffs_base__u16__sat_add_indirect(uint16_t* x, uint16_t y) {
  *x = wuffs_base__u16__sat_add(*x, y);
}

static inline void  //
wuffs_base__u16__sat_sub_indirect(uint16_t* x, uint16_t y) {
  *x = wuffs_base__u16__sat_sub(*x, y);
}

static inline void  //
wuffs_base__u32__sat_add_indirect(uint32_t* x, uint32_t y) {
  *x = wuffs_base__u32__sat_add(*x, y);
}

static inline void  //
wuffs_base__u32__sat_sub_indirect(uint32_t* x, uint32_t y) {
  *x = wuffs_base__u32__sat_sub(*x, y);
}

static inline void  //
wuffs_base__u64__sat_add_indirect(uint64_t* x, uint64_t y) {
  *x = wuffs_base__u64__sat_add(*x, y);
}

static inline void  //
wuffs_base__u64__sat_sub_indirect(uint64_t* x, uint64_t y) {
  *x = wuffs_base__u64__sat_sub(*x, y);
}

// ---------------- Slices and Tables

// wuffs_base__slice_u8__prefix returns up to the first up_to bytes of s.
static inline wuffs_base__slice_u8  //
wuffs_base__slice_u8__prefix(wuffs_base__slice_u8 s, uint64_t up_to) {
  if (((uint64_t)(s.len)) > up_to) {
    s.len = ((size_t)up_to);
  }
  return s;
}

// wuffs_base__slice_u8__suffix returns up to the last up_to bytes of s.
static inline wuffs_base__slice_u8  //
wuffs_base__slice_u8__suffix(wuffs_base__slice_u8 s, uint64_t up_to) {
  if (((uint64_t)(s.len)) > up_to) {
    s.ptr += ((uint64_t)(s.len)) - up_to;
    s.len = ((size_t)up_to);
  }
  return s;
}

// wuffs_base__slice_u8__copy_from_slice calls memmove(dst.ptr, src.ptr, len)
// where len is the minimum of dst.len and src.len.
//
// Passing a wuffs_base__slice_u8 with all fields NULL or zero (a valid, empty
// slice) is valid and results in a no-op.
static inline uint64_t  //
wuffs_base__slice_u8__copy_from_slice(wuffs_base__slice_u8 dst,
                                      wuffs_base__slice_u8 src) {
  size_t len = dst.len < src.len ? dst.len : src.len;
  if (len > 0) {
    memmove(dst.ptr, src.ptr, len);
  }
  return len;
}

// --------

static inline wuffs_base__slice_u8  //
wuffs_base__table_u8__row(wuffs_base__table_u8 t, uint32_t y) {
  if (y < t.height) {
    return wuffs_base__make_slice_u8(t.ptr + (t.stride * y), t.width);
  }
  return wuffs_base__make_slice_u8(NULL, 0);
}

// ---------------- Slices and Tables (Utility)

#define wuffs_base__utility__empty_slice_u8 wuffs_base__empty_slice_u8

// ---------------- Ranges and Rects

static inline uint32_t  //
wuffs_base__range_ii_u32__get_min_incl(const wuffs_base__range_ii_u32* r) {
  return r->min_incl;
}

static inline uint32_t  //
wuffs_base__range_ii_u32__get_max_incl(const wuffs_base__range_ii_u32* r) {
  return r->max_incl;
}

static inline uint32_t  //
wuffs_base__range_ie_u32__get_min_incl(const wuffs_base__range_ie_u32* r) {
  return r->min_incl;
}

static inline uint32_t  //
wuffs_base__range_ie_u32__get_max_excl(const wuffs_base__range_ie_u32* r) {
  return r->max_excl;
}

static inline uint64_t  //
wuffs_base__range_ii_u64__get_min_incl(const wuffs_base__range_ii_u64* r) {
  return r->min_incl;
}

static inline uint64_t  //
wuffs_base__range_ii_u64__get_max_incl(const wuffs_base__range_ii_u64* r) {
  return r->max_incl;
}

static inline uint64_t  //
wuffs_base__range_ie_u64__get_min_incl(const wuffs_base__range_ie_u64* r) {
  return r->min_incl;
}

static inline uint64_t  //
wuffs_base__range_ie_u64__get_max_excl(const wuffs_base__range_ie_u64* r) {
  return r->max_excl;
}

// ---------------- Ranges and Rects (Utility)

#define wuffs_base__utility__empty_range_ii_u32 wuffs_base__empty_range_ii_u32
#define wuffs_base__utility__empty_range_ie_u32 wuffs_base__empty_range_ie_u32
#define wuffs_base__utility__empty_range_ii_u64 wuffs_base__empty_range_ii_u64
#define wuffs_base__utility__empty_range_ie_u64 wuffs_base__empty_range_ie_u64
#define wuffs_base__utility__empty_rect_ii_u32 wuffs_base__empty_rect_ii_u32
#define wuffs_base__utility__empty_rect_ie_u32 wuffs_base__empty_rect_ie_u32
#define wuffs_base__utility__make_range_ii_u32 wuffs_base__make_range_ii_u32
#define wuffs_base__utility__make_range_ie_u32 wuffs_base__make_range_ie_u32
#define wuffs_base__utility__make_range_ii_u64 wuffs_base__make_range_ii_u64
#define wuffs_base__utility__make_range_ie_u64 wuffs_base__make_range_ie_u64
#define wuffs_base__utility__make_rect_ii_u32 wuffs_base__make_rect_ii_u32
#define wuffs_base__utility__make_rect_ie_u32 wuffs_base__make_rect_ie_u32

// ---------------- I/O

static inline uint64_t  //
wuffs_base__io__count_since(uint64_t mark, uint64_t index) {
  if (index >= mark) {
    return index - mark;
  }
  return 0;
}

// TODO: drop the "const" in "const uint8_t* ptr". Some though required about
// the base.io_reader.since method returning a mutable "slice base.u8".
#if defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wcast-qual"
#endif
static inline wuffs_base__slice_u8  //
wuffs_base__io__since(uint64_t mark, uint64_t index, const uint8_t* ptr) {
  if (index >= mark) {
    return wuffs_base__make_slice_u8(((uint8_t*)ptr) + mark,
                                     ((size_t)(index - mark)));
  }
  return wuffs_base__make_slice_u8(NULL, 0);
}
#if defined(__GNUC__)
#pragma GCC diagnostic pop
#endif

// --------

static inline void  //
wuffs_base__io_reader__limit(const uint8_t** ptr_io2_r,
                             const uint8_t* iop_r,
                             uint64_t limit) {
  if (((uint64_t)(*ptr_io2_r - iop_r)) > limit) {
    *ptr_io2_r = iop_r + limit;
  }
}

static inline uint32_t  //
wuffs_base__io_reader__limited_copy_u32_to_slice(const uint8_t** ptr_iop_r,
                                                 const uint8_t* io2_r,
                                                 uint32_t length,
                                                 wuffs_base__slice_u8 dst) {
  const uint8_t* iop_r = *ptr_iop_r;
  size_t n = dst.len;
  if (n > length) {
    n = length;
  }
  if (n > ((size_t)(io2_r - iop_r))) {
    n = (size_t)(io2_r - iop_r);
  }
  if (n > 0) {
    memmove(dst.ptr, iop_r, n);
    *ptr_iop_r += n;
  }
  return (uint32_t)(n);
}

// wuffs_base__io_reader__match7 returns whether the io_reader's upcoming bytes
// start with the given prefix (up to 7 bytes long). It is peek-like, not
// read-like, in that there are no side-effects.
//
// The low 3 bits of a hold the prefix length, n.
//
// The high 56 bits of a hold the prefix itself, in little-endian order. The
// first prefix byte is in bits 8..=15, the second prefix byte is in bits
// 16..=23, etc. The high (8 * (7 - n)) bits are ignored.
//
// There are three possible return values:
//  - 0 means success.
//  - 1 means inconclusive, equivalent to "$short read".
//  - 2 means failure.
static inline uint32_t  //
wuffs_base__io_reader__match7(const uint8_t* iop_r,
                              const uint8_t* io2_r,
                              wuffs_base__io_buffer* r,
                              uint64_t a) {
  uint32_t n = a & 7;
  a >>= 8;
  if ((io2_r - iop_r) >= 8) {
    uint64_t x = wuffs_base__peek_u64le__no_bounds_check(iop_r);
    uint32_t shift = 8 * (8 - n);
    return ((a << shift) == (x << shift)) ? 0 : 2;
  }
  for (; n > 0; n--) {
    if (iop_r >= io2_r) {
      return (r && r->meta.closed) ? 2 : 1;
    } else if (*iop_r != ((uint8_t)(a))) {
      return 2;
    }
    iop_r++;
    a >>= 8;
  }
  return 0;
}

static inline wuffs_base__io_buffer*  //
wuffs_base__io_reader__set(wuffs_base__io_buffer* b,
                           const uint8_t** ptr_iop_r,
                           const uint8_t** ptr_io0_r,
                           const uint8_t** ptr_io1_r,
                           const uint8_t** ptr_io2_r,
                           wuffs_base__slice_u8 data) {
  b->data = data;
  b->meta.wi = data.len;
  b->meta.ri = 0;
  b->meta.pos = 0;
  b->meta.closed = false;

  *ptr_iop_r = data.ptr;
  *ptr_io0_r = data.ptr;
  *ptr_io1_r = data.ptr;
  *ptr_io2_r = data.ptr + data.len;

  return b;
}

// --------

static inline uint64_t  //
wuffs_base__io_writer__copy_from_slice(uint8_t** ptr_iop_w,
                                       uint8_t* io2_w,
                                       wuffs_base__slice_u8 src) {
  uint8_t* iop_w = *ptr_iop_w;
  size_t n = src.len;
  if (n > ((size_t)(io2_w - iop_w))) {
    n = (size_t)(io2_w - iop_w);
  }
  if (n > 0) {
    memmove(iop_w, src.ptr, n);
    *ptr_iop_w += n;
  }
  return (uint64_t)(n);
}

static inline void  //
wuffs_base__io_writer__limit(uint8_t** ptr_io2_w,
                             uint8_t* iop_w,
                             uint64_t limit) {
  if (((uint64_t)(*ptr_io2_w - iop_w)) > limit) {
    *ptr_io2_w = iop_w + limit;
  }
}

static inline uint32_t  //
wuffs_base__io_writer__limited_copy_u32_from_history(uint8_t** ptr_iop_w,
                                                     uint8_t* io1_w,
                                                     uint8_t* io2_w,
                                                     uint32_t length,
                                                     uint32_t distance) {
  if (!distance) {
    return 0;
  }
  uint8_t* p = *ptr_iop_w;
  if ((size_t)(p - io1_w) < (size_t)(distance)) {
    return 0;
  }
  uint8_t* q = p - distance;
  size_t n = (size_t)(io2_w - p);
  if ((size_t)(length) > n) {
    length = (uint32_t)(n);
  } else {
    n = (size_t)(length);
  }
  // TODO: unrolling by 3 seems best for the std/deflate benchmarks, but that
  // is mostly because 3 is the minimum length for the deflate format. This
  // function implementation shouldn't overfit to that one format. Perhaps the
  // limited_copy_u32_from_history Wuffs method should also take an unroll hint
  // argument, and the cgen can look if that argument is the constant
  // expression '3'.
  //
  // See also wuffs_base__io_writer__limited_copy_u32_from_history_fast below.
  //
  // Alternatively or additionally, have a sloppy_limited_copy_u32_from_history
  // method that copies 8 bytes at a time, which can more than length bytes?
  for (; n >= 3; n -= 3) {
    *p++ = *q++;
    *p++ = *q++;
    *p++ = *q++;
  }
  for (; n; n--) {
    *p++ = *q++;
  }
  *ptr_iop_w = p;
  return length;
}

// wuffs_base__io_writer__limited_copy_u32_from_history_fast is like the
// wuffs_base__io_writer__limited_copy_u32_from_history function above, but has
// stronger pre-conditions.
//
// The caller needs to prove that:
//  - distance >  0
//  - distance <= (*ptr_iop_w - io1_w)
//  - length   <= (io2_w      - *ptr_iop_w)
static inline uint32_t  //
wuffs_base__io_writer__limited_copy_u32_from_history_fast(uint8_t** ptr_iop_w,
                                                          uint8_t* io1_w,
                                                          uint8_t* io2_w,
                                                          uint32_t length,
                                                          uint32_t distance) {
  uint8_t* p = *ptr_iop_w;
  uint8_t* q = p - distance;
  uint32_t n = length;
  for (; n >= 3; n -= 3) {
    *p++ = *q++;
    *p++ = *q++;
    *p++ = *q++;
  }
  for (; n; n--) {
    *p++ = *q++;
  }
  *ptr_iop_w = p;
  return length;
}

// wuffs_base__io_writer__limited_copy_u32_from_history_8_byte_chunks_fast is
// like the wuffs_base__io_writer__limited_copy_u32_from_history_fast function
// above, but copies 8 byte chunks at a time.
//
// In terms of number of bytes copied, length is rounded up to a multiple of 8.
// As a special case, a zero length rounds up to 8 (even though 0 is already a
// multiple of 8), since there is always at least one 8 byte chunk copied.
//
// In terms of advancing *ptr_iop_w, length is not rounded up.
//
// The caller needs to prove that:
//  - distance     >  0
//  - distance     <= (*ptr_iop_w - io1_w)
//  - (length + 8) <= (io2_w      - *ptr_iop_w)
static inline uint32_t  //
wuffs_base__io_writer__limited_copy_u32_from_history_8_byte_chunks_fast(
    uint8_t** ptr_iop_w,
    uint8_t* io1_w,
    uint8_t* io2_w,
    uint32_t length,
    uint32_t distance) {
  uint8_t* p = *ptr_iop_w;
  uint8_t* q = p - distance;
  uint32_t n = length;
  while (1) {
    memcpy(p, q, 8);
    if (n <= 8) {
      p += n;
      break;
    }
    p += 8;
    q += 8;
    n -= 8;
  }
  *ptr_iop_w = p;
  return length;
}

static inline uint32_t  //
wuffs_base__io_writer__limited_copy_u32_from_reader(uint8_t** ptr_iop_w,
                                                    uint8_t* io2_w,
                                                    uint32_t length,
                                                    const uint8_t** ptr_iop_r,
                                                    const uint8_t* io2_r) {
  uint8_t* iop_w = *ptr_iop_w;
  size_t n = length;
  if (n > ((size_t)(io2_w - iop_w))) {
    n = (size_t)(io2_w - iop_w);
  }
  const uint8_t* iop_r = *ptr_iop_r;
  if (n > ((size_t)(io2_r - iop_r))) {
    n = (size_t)(io2_r - iop_r);
  }
  if (n > 0) {
    memmove(iop_w, iop_r, n);
    *ptr_iop_w += n;
    *ptr_iop_r += n;
  }
  return (uint32_t)(n);
}

static inline uint32_t  //
wuffs_base__io_writer__limited_copy_u32_from_slice(uint8_t** ptr_iop_w,
                                                   uint8_t* io2_w,
                                                   uint32_t length,
                                                   wuffs_base__slice_u8 src) {
  uint8_t* iop_w = *ptr_iop_w;
  size_t n = src.len;
  if (n > length) {
    n = length;
  }
  if (n > ((size_t)(io2_w - iop_w))) {
    n = (size_t)(io2_w - iop_w);
  }
  if (n > 0) {
    memmove(iop_w, src.ptr, n);
    *ptr_iop_w += n;
  }
  return (uint32_t)(n);
}

static inline wuffs_base__io_buffer*  //
wuffs_base__io_writer__set(wuffs_base__io_buffer* b,
                           uint8_t** ptr_iop_w,
                           uint8_t** ptr_io0_w,
                           uint8_t** ptr_io1_w,
                           uint8_t** ptr_io2_w,
                           wuffs_base__slice_u8 data) {
  b->data = data;
  b->meta.wi = 0;
  b->meta.ri = 0;
  b->meta.pos = 0;
  b->meta.closed = false;

  *ptr_iop_w = data.ptr;
  *ptr_io0_w = data.ptr;
  *ptr_io1_w = data.ptr;
  *ptr_io2_w = data.ptr + data.len;

  return b;
}

// ---------------- I/O (Utility)

#define wuffs_base__utility__empty_io_reader wuffs_base__empty_io_reader
#define wuffs_base__utility__empty_io_writer wuffs_base__empty_io_writer

// ---------------- Tokens

// ---------------- Tokens (Utility)

// ---------------- Memory Allocation

// ---------------- Images

WUFFS_BASE__MAYBE_STATIC uint64_t  //
wuffs_base__pixel_swizzler__limited_swizzle_u32_interleaved_from_reader(
    const wuffs_base__pixel_swizzler* p,
    uint32_t up_to_num_pixels,
    wuffs_base__slice_u8 dst,
    wuffs_base__slice_u8 dst_palette,
    const uint8_t** ptr_iop_r,
    const uint8_t* io2_r);

WUFFS_BASE__MAYBE_STATIC uint64_t  //
wuffs_base__pixel_swizzler__swizzle_interleaved_from_reader(
    const wuffs_base__pixel_swizzler* p,
    wuffs_base__slice_u8 dst,
    wuffs_base__slice_u8 dst_palette,
    const uint8_t** ptr_iop_r,
    const uint8_t* io2_r);

WUFFS_BASE__MAYBE_STATIC uint64_t  //
wuffs_base__pixel_swizzler__swizzle_interleaved_transparent_black(
    const wuffs_base__pixel_swizzler* p,
    wuffs_base__slice_u8 dst,
    wuffs_base__slice_u8 dst_palette,
    uint64_t num_pixels);

// ---------------- Images (Utility)

#define wuffs_base__utility__make_pixel_format wuffs_base__make_pixel_format

// ---------------- String Conversions

// ---------------- Unicode and UTF-8

// ----------------

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BASE) || \
    defined(WUFFS_CONFIG__MODULE__BASE__CORE)

const uint8_t wuffs_base__low_bits_mask__u8[9] = {
    0x00, 0x01, 0x03, 0x07, 0x0F, 0x1F, 0x3F, 0x7F, 0xFF,
};

const uint16_t wuffs_base__low_bits_mask__u16[17] = {
    0x0000, 0x0001, 0x0003, 0x0007, 0x000F, 0x001F, 0x003F, 0x007F, 0x00FF,
    0x01FF, 0x03FF, 0x07FF, 0x0FFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF,
};

const uint32_t wuffs_base__low_bits_mask__u32[33] = {
    0x00000000, 0x00000001, 0x00000003, 0x00000007, 0x0000000F, 0x0000001F,
    0x0000003F, 0x0000007F, 0x000000FF, 0x000001FF, 0x000003FF, 0x000007FF,
    0x00000FFF, 0x00001FFF, 0x00003FFF, 0x00007FFF, 0x0000FFFF, 0x0001FFFF,
    0x0003FFFF, 0x0007FFFF, 0x000FFFFF, 0x001FFFFF, 0x003FFFFF, 0x007FFFFF,
    0x00FFFFFF, 0x01FFFFFF, 0x03FFFFFF, 0x07FFFFFF, 0x0FFFFFFF, 0x1FFFFFFF,
    0x3FFFFFFF, 0x7FFFFFFF, 0xFFFFFFFF,
};

const uint64_t wuffs_base__low_bits_mask__u64[65] = {
    0x0000000000000000, 0x0000000000000001, 0x0000000000000003,
    0x0000000000000007, 0x000000000000000F, 0x000000000000001F,
    0x000000000000003F, 0x000000000000007F, 0x00000000000000FF,
    0x00000000000001FF, 0x00000000000003FF, 0x00000000000007FF,
    0x0000000000000FFF, 0x0000000000001FFF, 0x0000000000003FFF,
    0x0000000000007FFF, 0x000000000000FFFF, 0x000000000001FFFF,
    0x000000000003FFFF, 0x000000000007FFFF, 0x00000000000FFFFF,
    0x00000000001FFFFF, 0x00000000003FFFFF, 0x00000000007FFFFF,
    0x0000000000FFFFFF, 0x0000000001FFFFFF, 0x0000000003FFFFFF,
    0x0000000007FFFFFF, 0x000000000FFFFFFF, 0x000000001FFFFFFF,
    0x000000003FFFFFFF, 0x000000007FFFFFFF, 0x00000000FFFFFFFF,
    0x00000001FFFFFFFF, 0x00000003FFFFFFFF, 0x00000007FFFFFFFF,
    0x0000000FFFFFFFFF, 0x0000001FFFFFFFFF, 0x0000003FFFFFFFFF,
    0x0000007FFFFFFFFF, 0x000000FFFFFFFFFF, 0x000001FFFFFFFFFF,
    0x000003FFFFFFFFFF, 0x000007FFFFFFFFFF, 0x00000FFFFFFFFFFF,
    0x00001FFFFFFFFFFF, 0x00003FFFFFFFFFFF, 0x00007FFFFFFFFFFF,
    0x0000FFFFFFFFFFFF, 0x0001FFFFFFFFFFFF, 0x0003FFFFFFFFFFFF,
    0x0007FFFFFFFFFFFF, 0x000FFFFFFFFFFFFF, 0x001FFFFFFFFFFFFF,
    0x003FFFFFFFFFFFFF, 0x007FFFFFFFFFFFFF, 0x00FFFFFFFFFFFFFF,
    0x01FFFFFFFFFFFFFF, 0x03FFFFFFFFFFFFFF, 0x07FFFFFFFFFFFFFF,
    0x0FFFFFFFFFFFFFFF, 0x1FFFFFFFFFFFFFFF, 0x3FFFFFFFFFFFFFFF,
    0x7FFFFFFFFFFFFFFF, 0xFFFFFFFFFFFFFFFF,
};

const uint32_t wuffs_base__pixel_format__bits_per_channel[16] = {
    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
    0x08, 0x0A, 0x0C, 0x10, 0x18, 0x20, 0x30, 0x40,
};

const char wuffs_base__note__i_o_redirect[] = "@base: I/O redirect";
const char wuffs_base__note__end_of_data[] = "@base: end of data";
const char wuffs_base__note__metadata_reported[] = "@base: metadata reported";
const char wuffs_base__suspension__even_more_information[] = "$base: even more information";
const char wuffs_base__suspension__mispositioned_read[] = "$base: mispositioned read";
const char wuffs_base__suspension__mispositioned_write[] = "$base: mispositioned write";
const char wuffs_base__suspension__short_read[] = "$base: short read";
const char wuffs_base__suspension__short_write[] = "$base: short write";
const char wuffs_base__error__bad_i_o_position[] = "#base: bad I/O position";
const char wuffs_base__error__bad_argument_length_too_short[] = "#base: bad argument (length too short)";
const char wuffs_base__error__bad_argument[] = "#base: bad argument";
const char wuffs_base__error__bad_call_sequence[] = "#base: bad call sequence";
const char wuffs_base__error__bad_data[] = "#base: bad data";
const char wuffs_base__error__bad_receiver[] = "#base: bad receiver";
const char wuffs_base__error__bad_restart[] = "#base: bad restart";
const char wuffs_base__error__bad_sizeof_receiver[] = "#base: bad sizeof receiver";
const char wuffs_base__error__bad_vtable[] = "#base: bad vtable";
const char wuffs_base__error__bad_workbuf_length[] = "#base: bad workbuf length";
const char wuffs_base__error__bad_wuffs_version[] = "#base: bad wuffs version";
const char wuffs_base__error__cannot_return_a_suspension[] = "#base: cannot return a suspension";
const char wuffs_base__error__disabled_by_previous_error[] = "#base: disabled by previous error";
const char wuffs_base__error__initialize_falsely_claimed_already_zeroed[] = "#base: initialize falsely claimed already zeroed";
const char wuffs_base__error__initialize_not_called[] = "#base: initialize not called";
const char wuffs_base__error__interleaved_coroutine_calls[] = "#base: interleaved coroutine calls";
const char wuffs_base__error__no_more_information[] = "#base: no more information";
const char wuffs_base__error__not_enough_data[] = "#base: not enough data";
const char wuffs_base__error__out_of_bounds[] = "#base: out of bounds";
const char wuffs_base__error__unsupported_method[] = "#base: unsupported method";
const char wuffs_base__error__unsupported_option[] = "#base: unsupported option";
const char wuffs_base__error__unsupported_pixel_swizzler_option[] = "#base: unsupported pixel swizzler option";
const char wuffs_base__error__too_much_data[] = "#base: too much data";

const char wuffs_base__hasher_u32__vtable_name[] = "{vtable}wuffs_base__hasher_u32";
const char wuffs_base__image_decoder__vtable_name[] = "{vtable}wuffs_base__image_decoder";
const char wuffs_base__io_transformer__vtable_name[] = "{vtable}wuffs_base__io_transformer";
const char wuffs_base__token_decoder__vtable_name[] = "{vtable}wuffs_base__token_decoder";

#endif  // !defined(WUFFS_CONFIG__MODULES) ||
        // defined(WUFFS_CONFIG__MODULE__BASE)  ||
        // defined(WUFFS_CONFIG__MODULE__BASE__CORE)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BASE) || \
    defined(WUFFS_CONFIG__MODULE__BASE__INTERFACES)

// ---------------- Interface Definitions.

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_base__hasher_u32__set_quirk_enabled(
    wuffs_base__hasher_u32* self,
    uint32_t a_quirk,
    bool a_enabled) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }

  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
  int i;
  for (i = 0; i < 63; i++) {
    if (v->vtable_name == wuffs_base__hasher_u32__vtable_name) {
      const wuffs_base__hasher_u32__func_ptrs* func_ptrs =
          (const wuffs_base__hasher_u32__func_ptrs*)(v->function_pointers);
      return (*func_ptrs->set_quirk_enabled)(self, a_quirk, a_enabled);
    } else if (v->vtable_name == NULL) {
      break;
    }
    v++;
  }

  return wuffs_base__make_empty_struct();
}

WUFFS_BASE__MAYBE_STATIC uint32_t
wuffs_base__hasher_u32__update_u32(
    wuffs_base__hasher_u32* self,
    wuffs_base__slice_u8 a_x) {
  if (!self) {
    return 0;
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return 0;
  }

  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
  int i;
  for (i = 0; i < 63; i++) {
    if (v->vtable_name == wuffs_base__hasher_u32__vtable_name) {
      const wuffs_base__hasher_u32__func_ptrs* func_ptrs =
          (const wuffs_base__hasher_u32__func_ptrs*)(v->function_pointers);
      return (*func_ptrs->update_u32)(self, a_x);
    } else if (v->vtable_name == NULL) {
      break;
    }
    v++;
  }

  return 0;
}

// --------

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_base__image_decoder__decode_frame(
    wuffs_base__image_decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__pixel_blend a_blend,
    wuffs_base__slice_u8 a_workbuf,
    wuffs_base__decode_frame_options* a_opts) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
            ? wuffs_base__error__disabled_by_previous_error
            : wuffs_base__error__initialize_not_called);
  }

  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
  int i;
  for (i = 0; i < 63; i++) {
    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
      return (*func_ptrs->decode_frame)(self, a_dst, a_src, a_blend, a_workbuf, a_opts);
    } else if (v->vtable_name == NULL) {
      break;
    }
    v++;
  }

  return wuffs_base__make_status(wuffs_base__error__bad_vtable);
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_base__image_decoder__decode_frame_config(
    wuffs_base__image_decoder* self,
    wuffs_base__frame_config* a_dst,
    wuffs_base__io_buffer* a_src) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
            ? wuffs_base__error__disabled_by_previous_error
            : wuffs_base__error__initialize_not_called);
  }

  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
  int i;
  for (i = 0; i < 63; i++) {
    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
      return (*func_ptrs->decode_frame_config)(self, a_dst, a_src);
    } else if (v->vtable_name == NULL) {
      break;
    }
    v++;
  }

  return wuffs_base__make_status(wuffs_base__error__bad_vtable);
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_base__image_decoder__decode_image_config(
    wuffs_base__image_decoder* self,
    wuffs_base__image_config* a_dst,
    wuffs_base__io_buffer* a_src) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
            ? wuffs_base__error__disabled_by_previous_error
            : wuffs_base__error__initialize_not_called);
  }

  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
  int i;
  for (i = 0; i < 63; i++) {
    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
      return (*func_ptrs->decode_image_config)(self, a_dst, a_src);
    } else if (v->vtable_name == NULL) {
      break;
    }
    v++;
  }

  return wuffs_base__make_status(wuffs_base__error__bad_vtable);
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
wuffs_base__image_decoder__frame_dirty_rect(
    const wuffs_base__image_decoder* self) {
  if (!self) {
    return wuffs_base__utility__empty_rect_ie_u32();
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__empty_rect_ie_u32();
  }

  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
  int i;
  for (i = 0; i < 63; i++) {
    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
      return (*func_ptrs->frame_dirty_rect)(self);
    } else if (v->vtable_name == NULL) {
      break;
    }
    v++;
  }

  return wuffs_base__utility__empty_rect_ie_u32();
}

WUFFS_BASE__MAYBE_STATIC uint32_t
wuffs_base__image_decoder__num_animation_loops(
    const wuffs_base__image_decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
  int i;
  for (i = 0; i < 63; i++) {
    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
      return (*func_ptrs->num_animation_loops)(self);
    } else if (v->vtable_name == NULL) {
      break;
    }
    v++;
  }

  return 0;
}

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_base__image_decoder__num_decoded_frame_configs(
    const wuffs_base__image_decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
  int i;
  for (i = 0; i < 63; i++) {
    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
      return (*func_ptrs->num_decoded_frame_configs)(self);
    } else if (v->vtable_name == NULL) {
      break;
    }
    v++;
  }

  return 0;
}

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_base__image_decoder__num_decoded_frames(
    const wuffs_base__image_decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
  int i;
  for (i = 0; i < 63; i++) {
    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
      return (*func_ptrs->num_decoded_frames)(self);
    } else if (v->vtable_name == NULL) {
      break;
    }
    v++;
  }

  return 0;
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_base__image_decoder__restart_frame(
    wuffs_base__image_decoder* self,
    uint64_t a_index,
    uint64_t a_io_position) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
            ? wuffs_base__error__disabled_by_previous_error
            : wuffs_base__error__initialize_not_called);
  }

  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
  int i;
  for (i = 0; i < 63; i++) {
    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
      return (*func_ptrs->restart_frame)(self, a_index, a_io_position);
    } else if (v->vtable_name == NULL) {
      break;
    }
    v++;
  }

  return wuffs_base__make_status(wuffs_base__error__bad_vtable);
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_base__image_decoder__set_quirk_enabled(
    wuffs_base__image_decoder* self,
    uint32_t a_quirk,
    bool a_enabled) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }

  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
  int i;
  for (i = 0; i < 63; i++) {
    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
      return (*func_ptrs->set_quirk_enabled)(self, a_quirk, a_enabled);
    } else if (v->vtable_name == NULL) {
      break;
    }
    v++;
  }

  return wuffs_base__make_empty_struct();
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_base__image_decoder__set_report_metadata(
    wuffs_base__image_decoder* self,
    uint32_t a_fourcc,
    bool a_report) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }

  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
  int i;
  for (i = 0; i < 63; i++) {
    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
      return (*func_ptrs->set_report_metadata)(self, a_fourcc, a_report);
    } else if (v->vtable_name == NULL) {
      break;
    }
    v++;
  }

  return wuffs_base__make_empty_struct();
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_base__image_decoder__tell_me_more(
    wuffs_base__image_decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__more_information* a_minfo,
    wuffs_base__io_buffer* a_src) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
            ? wuffs_base__error__disabled_by_previous_error
            : wuffs_base__error__initialize_not_called);
  }

  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
  int i;
  for (i = 0; i < 63; i++) {
    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
      return (*func_ptrs->tell_me_more)(self, a_dst, a_minfo, a_src);
    } else if (v->vtable_name == NULL) {
      break;
    }
    v++;
  }

  return wuffs_base__make_status(wuffs_base__error__bad_vtable);
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_base__image_decoder__workbuf_len(
    const wuffs_base__image_decoder* self) {
  if (!self) {
    return wuffs_base__utility__empty_range_ii_u64();
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__empty_range_ii_u64();
  }

  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
  int i;
  for (i = 0; i < 63; i++) {
    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
      return (*func_ptrs->workbuf_len)(self);
    } else if (v->vtable_name == NULL) {
      break;
    }
    v++;
  }

  return wuffs_base__utility__empty_range_ii_u64();
}

// --------

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_base__io_transformer__set_quirk_enabled(
    wuffs_base__io_transformer* self,
    uint32_t a_quirk,
    bool a_enabled) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }

  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
  int i;
  for (i = 0; i < 63; i++) {
    if (v->vtable_name == wuffs_base__io_transformer__vtable_name) {
      const wuffs_base__io_transformer__func_ptrs* func_ptrs =
          (const wuffs_base__io_transformer__func_ptrs*)(v->function_pointers);
      return (*func_ptrs->set_quirk_enabled)(self, a_quirk, a_enabled);
    } else if (v->vtable_name == NULL) {
      break;
    }
    v++;
  }

  return wuffs_base__make_empty_struct();
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_base__io_transformer__transform_io(
    wuffs_base__io_transformer* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__slice_u8 a_workbuf) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
            ? wuffs_base__error__disabled_by_previous_error
            : wuffs_base__error__initialize_not_called);
  }

  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
  int i;
  for (i = 0; i < 63; i++) {
    if (v->vtable_name == wuffs_base__io_transformer__vtable_name) {
      const wuffs_base__io_transformer__func_ptrs* func_ptrs =
          (const wuffs_base__io_transformer__func_ptrs*)(v->function_pointers);
      return (*func_ptrs->transform_io)(self, a_dst, a_src, a_workbuf);
    } else if (v->vtable_name == NULL) {
      break;
    }
    v++;
  }

  return wuffs_base__make_status(wuffs_base__error__bad_vtable);
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_base__io_transformer__workbuf_len(
    const wuffs_base__io_transformer* self) {
  if (!self) {
    return wuffs_base__utility__empty_range_ii_u64();
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__empty_range_ii_u64();
  }

  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
  int i;
  for (i = 0; i < 63; i++) {
    if (v->vtable_name == wuffs_base__io_transformer__vtable_name) {
      const wuffs_base__io_transformer__func_ptrs* func_ptrs =
          (const wuffs_base__io_transformer__func_ptrs*)(v->function_pointers);
      return (*func_ptrs->workbuf_len)(self);
    } else if (v->vtable_name == NULL) {
      break;
    }
    v++;
  }

  return wuffs_base__utility__empty_range_ii_u64();
}

// --------

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_base__token_decoder__decode_tokens(
    wuffs_base__token_decoder* self,
    wuffs_base__token_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__slice_u8 a_workbuf) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
            ? wuffs_base__error__disabled_by_previous_error
            : wuffs_base__error__initialize_not_called);
  }

  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
  int i;
  for (i = 0; i < 63; i++) {
    if (v->vtable_name == wuffs_base__token_decoder__vtable_name) {
      const wuffs_base__token_decoder__func_ptrs* func_ptrs =
          (const wuffs_base__token_decoder__func_ptrs*)(v->function_pointers);
      return (*func_ptrs->decode_tokens)(self, a_dst, a_src, a_workbuf);
    } else if (v->vtable_name == NULL) {
      break;
    }
    v++;
  }

  return wuffs_base__make_status(wuffs_base__error__bad_vtable);
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_base__token_decoder__set_quirk_enabled(
    wuffs_base__token_decoder* self,
    uint32_t a_quirk,
    bool a_enabled) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }

  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
  int i;
  for (i = 0; i < 63; i++) {
    if (v->vtable_name == wuffs_base__token_decoder__vtable_name) {
      const wuffs_base__token_decoder__func_ptrs* func_ptrs =
          (const wuffs_base__token_decoder__func_ptrs*)(v->function_pointers);
      return (*func_ptrs->set_quirk_enabled)(self, a_quirk, a_enabled);
    } else if (v->vtable_name == NULL) {
      break;
    }
    v++;
  }

  return wuffs_base__make_empty_struct();
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_base__token_decoder__workbuf_len(
    const wuffs_base__token_decoder* self) {
  if (!self) {
    return wuffs_base__utility__empty_range_ii_u64();
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__empty_range_ii_u64();
  }

  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
  int i;
  for (i = 0; i < 63; i++) {
    if (v->vtable_name == wuffs_base__token_decoder__vtable_name) {
      const wuffs_base__token_decoder__func_ptrs* func_ptrs =
          (const wuffs_base__token_decoder__func_ptrs*)(v->function_pointers);
      return (*func_ptrs->workbuf_len)(self);
    } else if (v->vtable_name == NULL) {
      break;
    }
    v++;
  }

  return wuffs_base__utility__empty_range_ii_u64();
}

#endif  // !defined(WUFFS_CONFIG__MODULES) ||
        // defined(WUFFS_CONFIG__MODULE__BASE) ||
        // defined(WUFFS_CONFIG__MODULE__BASE__INTERFACES)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BASE) || \
    defined(WUFFS_CONFIG__MODULE__BASE__FLOATCONV)

// ---------------- IEEE 754 Floating Point

// The etc__hpd_left_shift and etc__powers_of_5 tables were printed by
// script/print-hpd-left-shift.go. That script has an optional -comments flag,
// whose output is not copied here, which prints further detail.
//
// These tables are used in
// wuffs_base__private_implementation__high_prec_dec__lshift_num_new_digits.

// wuffs_base__private_implementation__hpd_left_shift[i] encodes the number of
// new digits created after multiplying a positive integer by (1 << i): the
// additional length in the decimal representation. For example, shifting "234"
// by 3 (equivalent to multiplying by 8) will produce "1872". Going from a
// 3-length string to a 4-length string means that 1 new digit was added (and
// existing digits may have changed).
//
// Shifting by i can add either N or N-1 new digits, depending on whether the
// original positive integer compares >= or < to the i'th power of 5 (as 10
// equals 2 * 5). Comparison is lexicographic, not numerical.
//
// For example, shifting by 4 (i.e. multiplying by 16) can add 1 or 2 new
// digits, depending on a lexicographic comparison to (5 ** 4), i.e. "625":
//  - ("1"      << 4) is "16",       which adds 1 new digit.
//  - ("5678"   << 4) is "90848",    which adds 1 new digit.
//  - ("624"    << 4) is "9984",     which adds 1 new digit.
//  - ("62498"  << 4) is "999968",   which adds 1 new digit.
//  - ("625"    << 4) is "10000",    which adds 2 new digits.
//  - ("625001" << 4) is "10000016", which adds 2 new digits.
//  - ("7008"   << 4) is "112128",   which adds 2 new digits.
//  - ("99"     << 4) is "1584",     which adds 2 new digits.
//
// Thus, when i is 4, N is 2 and (5 ** i) is "625". This etc__hpd_left_shift
// array encodes this as:
//  - etc__hpd_left_shift[4] is 0x1006 = (2 << 11) | 0x0006.
//  - etc__hpd_left_shift[5] is 0x1009 = (? << 11) | 0x0009.
// where the ? isn't relevant for i == 4.
//
// The high 5 bits of etc__hpd_left_shift[i] is N, the higher of the two
// possible number of new digits. The low 11 bits are an offset into the
// etc__powers_of_5 array (of length 0x051C, so offsets fit in 11 bits). When i
// is 4, its offset and the next one is 6 and 9, and etc__powers_of_5[6 .. 9]
// is the string "\x06\x02\x05", so the relevant power of 5 is "625".
//
// Thanks to Ken Thompson for the original idea.
static const uint16_t wuffs_base__private_implementation__hpd_left_shift[65] = {
    0x0000, 0x0800, 0x0801, 0x0803, 0x1006, 0x1009, 0x100D, 0x1812, 0x1817,
    0x181D, 0x2024, 0x202B, 0x2033, 0x203C, 0x2846, 0x2850, 0x285B, 0x3067,
    0x3073, 0x3080, 0x388E, 0x389C, 0x38AB, 0x38BB, 0x40CC, 0x40DD, 0x40EF,
    0x4902, 0x4915, 0x4929, 0x513E, 0x5153, 0x5169, 0x5180, 0x5998, 0x59B0,
    0x59C9, 0x61E3, 0x61FD, 0x6218, 0x6A34, 0x6A50, 0x6A6D, 0x6A8B, 0x72AA,
    0x72C9, 0x72E9, 0x7B0A, 0x7B2B, 0x7B4D, 0x8370, 0x8393, 0x83B7, 0x83DC,
    0x8C02, 0x8C28, 0x8C4F, 0x9477, 0x949F, 0x94C8, 0x9CF2, 0x051C, 0x051C,
    0x051C, 0x051C,
};

// wuffs_base__private_implementation__powers_of_5 contains the powers of 5,
// concatenated together: "5", "25", "125", "625", "3125", etc.
static const uint8_t wuffs_base__private_implementation__powers_of_5[0x051C] = {
    5, 2, 5, 1, 2, 5, 6, 2, 5, 3, 1, 2, 5, 1, 5, 6, 2, 5, 7, 8, 1, 2, 5, 3, 9,
    0, 6, 2, 5, 1, 9, 5, 3, 1, 2, 5, 9, 7, 6, 5, 6, 2, 5, 4, 8, 8, 2, 8, 1, 2,
    5, 2, 4, 4, 1, 4, 0, 6, 2, 5, 1, 2, 2, 0, 7, 0, 3, 1, 2, 5, 6, 1, 0, 3, 5,
    1, 5, 6, 2, 5, 3, 0, 5, 1, 7, 5, 7, 8, 1, 2, 5, 1, 5, 2, 5, 8, 7, 8, 9, 0,
    6, 2, 5, 7, 6, 2, 9, 3, 9, 4, 5, 3, 1, 2, 5, 3, 8, 1, 4, 6, 9, 7, 2, 6, 5,
    6, 2, 5, 1, 9, 0, 7, 3, 4, 8, 6, 3, 2, 8, 1, 2, 5, 9, 5, 3, 6, 7, 4, 3, 1,
    6, 4, 0, 6, 2, 5, 4, 7, 6, 8, 3, 7, 1, 5, 8, 2, 0, 3, 1, 2, 5, 2, 3, 8, 4,
    1, 8, 5, 7, 9, 1, 0, 1, 5, 6, 2, 5, 1, 1, 9, 2, 0, 9, 2, 8, 9, 5, 5, 0, 7,
    8, 1, 2, 5, 5, 9, 6, 0, 4, 6, 4, 4, 7, 7, 5, 3, 9, 0, 6, 2, 5, 2, 9, 8, 0,
    2, 3, 2, 2, 3, 8, 7, 6, 9, 5, 3, 1, 2, 5, 1, 4, 9, 0, 1, 1, 6, 1, 1, 9, 3,
    8, 4, 7, 6, 5, 6, 2, 5, 7, 4, 5, 0, 5, 8, 0, 5, 9, 6, 9, 2, 3, 8, 2, 8, 1,
    2, 5, 3, 7, 2, 5, 2, 9, 0, 2, 9, 8, 4, 6, 1, 9, 1, 4, 0, 6, 2, 5, 1, 8, 6,
    2, 6, 4, 5, 1, 4, 9, 2, 3, 0, 9, 5, 7, 0, 3, 1, 2, 5, 9, 3, 1, 3, 2, 2, 5,
    7, 4, 6, 1, 5, 4, 7, 8, 5, 1, 5, 6, 2, 5, 4, 6, 5, 6, 6, 1, 2, 8, 7, 3, 0,
    7, 7, 3, 9, 2, 5, 7, 8, 1, 2, 5, 2, 3, 2, 8, 3, 0, 6, 4, 3, 6, 5, 3, 8, 6,
    9, 6, 2, 8, 9, 0, 6, 2, 5, 1, 1, 6, 4, 1, 5, 3, 2, 1, 8, 2, 6, 9, 3, 4, 8,
    1, 4, 4, 5, 3, 1, 2, 5, 5, 8, 2, 0, 7, 6, 6, 0, 9, 1, 3, 4, 6, 7, 4, 0, 7,
    2, 2, 6, 5, 6, 2, 5, 2, 9, 1, 0, 3, 8, 3, 0, 4, 5, 6, 7, 3, 3, 7, 0, 3, 6,
    1, 3, 2, 8, 1, 2, 5, 1, 4, 5, 5, 1, 9, 1, 5, 2, 2, 8, 3, 6, 6, 8, 5, 1, 8,
    0, 6, 6, 4, 0, 6, 2, 5, 7, 2, 7, 5, 9, 5, 7, 6, 1, 4, 1, 8, 3, 4, 2, 5, 9,
    0, 3, 3, 2, 0, 3, 1, 2, 5, 3, 6, 3, 7, 9, 7, 8, 8, 0, 7, 0, 9, 1, 7, 1, 2,
    9, 5, 1, 6, 6, 0, 1, 5, 6, 2, 5, 1, 8, 1, 8, 9, 8, 9, 4, 0, 3, 5, 4, 5, 8,
    5, 6, 4, 7, 5, 8, 3, 0, 0, 7, 8, 1, 2, 5, 9, 0, 9, 4, 9, 4, 7, 0, 1, 7, 7,
    2, 9, 2, 8, 2, 3, 7, 9, 1, 5, 0, 3, 9, 0, 6, 2, 5, 4, 5, 4, 7, 4, 7, 3, 5,
    0, 8, 8, 6, 4, 6, 4, 1, 1, 8, 9, 5, 7, 5, 1, 9, 5, 3, 1, 2, 5, 2, 2, 7, 3,
    7, 3, 6, 7, 5, 4, 4, 3, 2, 3, 2, 0, 5, 9, 4, 7, 8, 7, 5, 9, 7, 6, 5, 6, 2,
    5, 1, 1, 3, 6, 8, 6, 8, 3, 7, 7, 2, 1, 6, 1, 6, 0, 2, 9, 7, 3, 9, 3, 7, 9,
    8, 8, 2, 8, 1, 2, 5, 5, 6, 8, 4, 3, 4, 1, 8, 8, 6, 0, 8, 0, 8, 0, 1, 4, 8,
    6, 9, 6, 8, 9, 9, 4, 1, 4, 0, 6, 2, 5, 2, 8, 4, 2, 1, 7, 0, 9, 4, 3, 0, 4,
    0, 4, 0, 0, 7, 4, 3, 4, 8, 4, 4, 9, 7, 0, 7, 0, 3, 1, 2, 5, 1, 4, 2, 1, 0,
    8, 5, 4, 7, 1, 5, 2, 0, 2, 0, 0, 3, 7, 1, 7, 4, 2, 2, 4, 8, 5, 3, 5, 1, 5,
    6, 2, 5, 7, 1, 0, 5, 4, 2, 7, 3, 5, 7, 6, 0, 1, 0, 0, 1, 8, 5, 8, 7, 1, 1,
    2, 4, 2, 6, 7, 5, 7, 8, 1, 2, 5, 3, 5, 5, 2, 7, 1, 3, 6, 7, 8, 8, 0, 0, 5,
    0, 0, 9, 2, 9, 3, 5, 5, 6, 2, 1, 3, 3, 7, 8, 9, 0, 6, 2, 5, 1, 7, 7, 6, 3,
    5, 6, 8, 3, 9, 4, 0, 0, 2, 5, 0, 4, 6, 4, 6, 7, 7, 8, 1, 0, 6, 6, 8, 9, 4,
    5, 3, 1, 2, 5, 8, 8, 8, 1, 7, 8, 4, 1, 9, 7, 0, 0, 1, 2, 5, 2, 3, 2, 3, 3,
    8, 9, 0, 5, 3, 3, 4, 4, 7, 2, 6, 5, 6, 2, 5, 4, 4, 4, 0, 8, 9, 2, 0, 9, 8,
    5, 0, 0, 6, 2, 6, 1, 6, 1, 6, 9, 4, 5, 2, 6, 6, 7, 2, 3, 6, 3, 2, 8, 1, 2,
    5, 2, 2, 2, 0, 4, 4, 6, 0, 4, 9, 2, 5, 0, 3, 1, 3, 0, 8, 0, 8, 4, 7, 2, 6,
    3, 3, 3, 6, 1, 8, 1, 6, 4, 0, 6, 2, 5, 1, 1, 1, 0, 2, 2, 3, 0, 2, 4, 6, 2,
    5, 1, 5, 6, 5, 4, 0, 4, 2, 3, 6, 3, 1, 6, 6, 8, 0, 9, 0, 8, 2, 0, 3, 1, 2,
    5, 5, 5, 5, 1, 1, 1, 5, 1, 2, 3, 1, 2, 5, 7, 8, 2, 7, 0, 2, 1, 1, 8, 1, 5,
    8, 3, 4, 0, 4, 5, 4, 1, 0, 1, 5, 6, 2, 5, 2, 7, 7, 5, 5, 5, 7, 5, 6, 1, 5,
    6, 2, 8, 9, 1, 3, 5, 1, 0, 5, 9, 0, 7, 9, 1, 7, 0, 2, 2, 7, 0, 5, 0, 7, 8,
    1, 2, 5, 1, 3, 8, 7, 7, 7, 8, 7, 8, 0, 7, 8, 1, 4, 4, 5, 6, 7, 5, 5, 2, 9,
    5, 3, 9, 5, 8, 5, 1, 1, 3, 5, 2, 5, 3, 9, 0, 6, 2, 5, 6, 9, 3, 8, 8, 9, 3,
    9, 0, 3, 9, 0, 7, 2, 2, 8, 3, 7, 7, 6, 4, 7, 6, 9, 7, 9, 2, 5, 5, 6, 7, 6,
    2, 6, 9, 5, 3, 1, 2, 5, 3, 4, 6, 9, 4, 4, 6, 9, 5, 1, 9, 5, 3, 6, 1, 4, 1,
    8, 8, 8, 2, 3, 8, 4, 8, 9, 6, 2, 7, 8, 3, 8, 1, 3, 4, 7, 6, 5, 6, 2, 5, 1,
    7, 3, 4, 7, 2, 3, 4, 7, 5, 9, 7, 6, 8, 0, 7, 0, 9, 4, 4, 1, 1, 9, 2, 4, 4,
    8, 1, 3, 9, 1, 9, 0, 6, 7, 3, 8, 2, 8, 1, 2, 5, 8, 6, 7, 3, 6, 1, 7, 3, 7,
    9, 8, 8, 4, 0, 3, 5, 4, 7, 2, 0, 5, 9, 6, 2, 2, 4, 0, 6, 9, 5, 9, 5, 3, 3,
    6, 9, 1, 4, 0, 6, 2, 5,
};

// --------

// wuffs_base__private_implementation__powers_of_10 contains truncated
// approximations to the powers of 10, ranging from 1e-307 to 1e+288 inclusive,
// as 596 pairs of uint64_t values (a 128-bit mantissa).
//
// There's also an implicit third column (implied by a linear formula involving
// the base-10 exponent) that is the base-2 exponent, biased by a magic
// constant. That constant (1214 or 0x04BE) equals 1023 + 191. 1023 is the bias
// for IEEE 754 double-precision floating point. 191 is ((3 * 64) - 1) and
// wuffs_base__private_implementation__parse_number_f64_eisel_lemire works with
// multiples-of-64-bit mantissas.
//
// For example, the third row holds the approximation to 1e-305:
//   0xE0B62E29_29ABA83C_331ACDAB_FE94DE87 * (2 ** (0x0049 - 0x04BE))
//
// Similarly, 1e+4 is approximated by:
//   0x9C400000_00000000_00000000_00000000 * (2 ** (0x044C - 0x04BE))
//
// Similarly, 1e+68 is approximated by:
//   0xED63A231_D4C4FB27_4CA7AAA8_63EE4BDD * (2 ** (0x0520 - 0x04BE))
//
// This table was generated by by script/print-mpb-powers-of-10.go
static const uint64_t wuffs_base__private_implementation__powers_of_10[596][2] =
    {
        {0xA5D3B6D479F8E056, 0x8FD0C16206306BAB},  // 1e-307
        {0x8F48A4899877186C, 0xB3C4F1BA87BC8696},  // 1e-306
        {0x331ACDABFE94DE87, 0xE0B62E2929ABA83C},  // 1e-305
        {0x9FF0C08B7F1D0B14, 0x8C71DCD9BA0B4925},  // 1e-304
        {0x07ECF0AE5EE44DD9, 0xAF8E5410288E1B6F},  // 1e-303
        {0xC9E82CD9F69D6150, 0xDB71E91432B1A24A},  // 1e-302
        {0xBE311C083A225CD2, 0x892731AC9FAF056E},  // 1e-301
        {0x6DBD630A48AAF406, 0xAB70FE17C79AC6CA},  // 1e-300
        {0x092CBBCCDAD5B108, 0xD64D3D9DB981787D},  // 1e-299
        {0x25BBF56008C58EA5, 0x85F0468293F0EB4E},  // 1e-298
        {0xAF2AF2B80AF6F24E, 0xA76C582338ED2621},  // 1e-297
        {0x1AF5AF660DB4AEE1, 0xD1476E2C07286FAA},  // 1e-296
        {0x50D98D9FC890ED4D, 0x82CCA4DB847945CA},  // 1e-295
        {0xE50FF107BAB528A0, 0xA37FCE126597973C},  // 1e-294
        {0x1E53ED49A96272C8, 0xCC5FC196FEFD7D0C},  // 1e-293
        {0x25E8E89C13BB0F7A, 0xFF77B1FCBEBCDC4F},  // 1e-292
        {0x77B191618C54E9AC, 0x9FAACF3DF73609B1},  // 1e-291
        {0xD59DF5B9EF6A2417, 0xC795830D75038C1D},  // 1e-290
        {0x4B0573286B44AD1D, 0xF97AE3D0D2446F25},  // 1e-289
        {0x4EE367F9430AEC32, 0x9BECCE62836AC577},  // 1e-288
        {0x229C41F793CDA73F, 0xC2E801FB244576D5},  // 1e-287
        {0x6B43527578C1110F, 0xF3A20279ED56D48A},  // 1e-286
        {0x830A13896B78AAA9, 0x9845418C345644D6},  // 1e-285
        {0x23CC986BC656D553, 0xBE5691EF416BD60C},  // 1e-284
        {0x2CBFBE86B7EC8AA8, 0xEDEC366B11C6CB8F},  // 1e-283
        {0x7BF7D71432F3D6A9, 0x94B3A202EB1C3F39},  // 1e-282
        {0xDAF5CCD93FB0CC53, 0xB9E08A83A5E34F07},  // 1e-281
        {0xD1B3400F8F9CFF68, 0xE858AD248F5C22C9},  // 1e-280
        {0x23100809B9C21FA1, 0x91376C36D99995BE},  // 1e-279
        {0xABD40A0C2832A78A, 0xB58547448FFFFB2D},  // 1e-278
        {0x16C90C8F323F516C, 0xE2E69915B3FFF9F9},  // 1e-277
        {0xAE3DA7D97F6792E3, 0x8DD01FAD907FFC3B},  // 1e-276
        {0x99CD11CFDF41779C, 0xB1442798F49FFB4A},  // 1e-275
        {0x40405643D711D583, 0xDD95317F31C7FA1D},  // 1e-274
        {0x482835EA666B2572, 0x8A7D3EEF7F1CFC52},  // 1e-273
        {0xDA3243650005EECF, 0xAD1C8EAB5EE43B66},  // 1e-272
        {0x90BED43E40076A82, 0xD863B256369D4A40},  // 1e-271
        {0x5A7744A6E804A291, 0x873E4F75E2224E68},  // 1e-270
        {0x711515D0A205CB36, 0xA90DE3535AAAE202},  // 1e-269
        {0x0D5A5B44CA873E03, 0xD3515C2831559A83},  // 1e-268
        {0xE858790AFE9486C2, 0x8412D9991ED58091},  // 1e-267
        {0x626E974DBE39A872, 0xA5178FFF668AE0B6},  // 1e-266
        {0xFB0A3D212DC8128F, 0xCE5D73FF402D98E3},  // 1e-265
        {0x7CE66634BC9D0B99, 0x80FA687F881C7F8E},  // 1e-264
        {0x1C1FFFC1EBC44E80, 0xA139029F6A239F72},  // 1e-263
        {0xA327FFB266B56220, 0xC987434744AC874E},  // 1e-262
        {0x4BF1FF9F0062BAA8, 0xFBE9141915D7A922},  // 1e-261
        {0x6F773FC3603DB4A9, 0x9D71AC8FADA6C9B5},  // 1e-260
        {0xCB550FB4384D21D3, 0xC4CE17B399107C22},  // 1e-259
        {0x7E2A53A146606A48, 0xF6019DA07F549B2B},  // 1e-258
        {0x2EDA7444CBFC426D, 0x99C102844F94E0FB},  // 1e-257
        {0xFA911155FEFB5308, 0xC0314325637A1939},  // 1e-256
        {0x793555AB7EBA27CA, 0xF03D93EEBC589F88},  // 1e-255
        {0x4BC1558B2F3458DE, 0x96267C7535B763B5},  // 1e-254
        {0x9EB1AAEDFB016F16, 0xBBB01B9283253CA2},  // 1e-253
        {0x465E15A979C1CADC, 0xEA9C227723EE8BCB},  // 1e-252
        {0x0BFACD89EC191EC9, 0x92A1958A7675175F},  // 1e-251
        {0xCEF980EC671F667B, 0xB749FAED14125D36},  // 1e-250
        {0x82B7E12780E7401A, 0xE51C79A85916F484},  // 1e-249
        {0xD1B2ECB8B0908810, 0x8F31CC0937AE58D2},  // 1e-248
        {0x861FA7E6DCB4AA15, 0xB2FE3F0B8599EF07},  // 1e-247
        {0x67A791E093E1D49A, 0xDFBDCECE67006AC9},  // 1e-246
        {0xE0C8BB2C5C6D24E0, 0x8BD6A141006042BD},  // 1e-245
        {0x58FAE9F773886E18, 0xAECC49914078536D},  // 1e-244
        {0xAF39A475506A899E, 0xDA7F5BF590966848},  // 1e-243
        {0x6D8406C952429603, 0x888F99797A5E012D},  // 1e-242
        {0xC8E5087BA6D33B83, 0xAAB37FD7D8F58178},  // 1e-241
        {0xFB1E4A9A90880A64, 0xD5605FCDCF32E1D6},  // 1e-240
        {0x5CF2EEA09A55067F, 0x855C3BE0A17FCD26},  // 1e-239
        {0xF42FAA48C0EA481E, 0xA6B34AD8C9DFC06F},  // 1e-238
        {0xF13B94DAF124DA26, 0xD0601D8EFC57B08B},  // 1e-237
        {0x76C53D08D6B70858, 0x823C12795DB6CE57},  // 1e-236
        {0x54768C4B0C64CA6E, 0xA2CB1717B52481ED},  // 1e-235
        {0xA9942F5DCF7DFD09, 0xCB7DDCDDA26DA268},  // 1e-234
        {0xD3F93B35435D7C4C, 0xFE5D54150B090B02},  // 1e-233
        {0xC47BC5014A1A6DAF, 0x9EFA548D26E5A6E1},  // 1e-232
        {0x359AB6419CA1091B, 0xC6B8E9B0709F109A},  // 1e-231
        {0xC30163D203C94B62, 0xF867241C8CC6D4C0},  // 1e-230
        {0x79E0DE63425DCF1D, 0x9B407691D7FC44F8},  // 1e-229
        {0x985915FC12F542E4, 0xC21094364DFB5636},  // 1e-228
        {0x3E6F5B7B17B2939D, 0xF294B943E17A2BC4},  // 1e-227
        {0xA705992CEECF9C42, 0x979CF3CA6CEC5B5A},  // 1e-226
        {0x50C6FF782A838353, 0xBD8430BD08277231},  // 1e-225
        {0xA4F8BF5635246428, 0xECE53CEC4A314EBD},  // 1e-224
        {0x871B7795E136BE99, 0x940F4613AE5ED136},  // 1e-223
        {0x28E2557B59846E3F, 0xB913179899F68584},  // 1e-222
        {0x331AEADA2FE589CF, 0xE757DD7EC07426E5},  // 1e-221
        {0x3FF0D2C85DEF7621, 0x9096EA6F3848984F},  // 1e-220
        {0x0FED077A756B53A9, 0xB4BCA50B065ABE63},  // 1e-219
        {0xD3E8495912C62894, 0xE1EBCE4DC7F16DFB},  // 1e-218
        {0x64712DD7ABBBD95C, 0x8D3360F09CF6E4BD},  // 1e-217
        {0xBD8D794D96AACFB3, 0xB080392CC4349DEC},  // 1e-216
        {0xECF0D7A0FC5583A0, 0xDCA04777F541C567},  // 1e-215
        {0xF41686C49DB57244, 0x89E42CAAF9491B60},  // 1e-214
        {0x311C2875C522CED5, 0xAC5D37D5B79B6239},  // 1e-213
        {0x7D633293366B828B, 0xD77485CB25823AC7},  // 1e-212
        {0xAE5DFF9C02033197, 0x86A8D39EF77164BC},  // 1e-211
        {0xD9F57F830283FDFC, 0xA8530886B54DBDEB},  // 1e-210
        {0xD072DF63C324FD7B, 0xD267CAA862A12D66},  // 1e-209
        {0x4247CB9E59F71E6D, 0x8380DEA93DA4BC60},  // 1e-208
        {0x52D9BE85F074E608, 0xA46116538D0DEB78},  // 1e-207
        {0x67902E276C921F8B, 0xCD795BE870516656},  // 1e-206
        {0x00BA1CD8A3DB53B6, 0x806BD9714632DFF6},  // 1e-205
        {0x80E8A40ECCD228A4, 0xA086CFCD97BF97F3},  // 1e-204
        {0x6122CD128006B2CD, 0xC8A883C0FDAF7DF0},  // 1e-203
        {0x796B805720085F81, 0xFAD2A4B13D1B5D6C},  // 1e-202
        {0xCBE3303674053BB0, 0x9CC3A6EEC6311A63},  // 1e-201
        {0xBEDBFC4411068A9C, 0xC3F490AA77BD60FC},  // 1e-200
        {0xEE92FB5515482D44, 0xF4F1B4D515ACB93B},  // 1e-199
        {0x751BDD152D4D1C4A, 0x991711052D8BF3C5},  // 1e-198
        {0xD262D45A78A0635D, 0xBF5CD54678EEF0B6},  // 1e-197
        {0x86FB897116C87C34, 0xEF340A98172AACE4},  // 1e-196
        {0xD45D35E6AE3D4DA0, 0x9580869F0E7AAC0E},  // 1e-195
        {0x8974836059CCA109, 0xBAE0A846D2195712},  // 1e-194
        {0x2BD1A438703FC94B, 0xE998D258869FACD7},  // 1e-193
        {0x7B6306A34627DDCF, 0x91FF83775423CC06},  // 1e-192
        {0x1A3BC84C17B1D542, 0xB67F6455292CBF08},  // 1e-191
        {0x20CABA5F1D9E4A93, 0xE41F3D6A7377EECA},  // 1e-190
        {0x547EB47B7282EE9C, 0x8E938662882AF53E},  // 1e-189
        {0xE99E619A4F23AA43, 0xB23867FB2A35B28D},  // 1e-188
        {0x6405FA00E2EC94D4, 0xDEC681F9F4C31F31},  // 1e-187
        {0xDE83BC408DD3DD04, 0x8B3C113C38F9F37E},  // 1e-186
        {0x9624AB50B148D445, 0xAE0B158B4738705E},  // 1e-185
        {0x3BADD624DD9B0957, 0xD98DDAEE19068C76},  // 1e-184
        {0xE54CA5D70A80E5D6, 0x87F8A8D4CFA417C9},  // 1e-183
        {0x5E9FCF4CCD211F4C, 0xA9F6D30A038D1DBC},  // 1e-182
        {0x7647C3200069671F, 0xD47487CC8470652B},  // 1e-181
        {0x29ECD9F40041E073, 0x84C8D4DFD2C63F3B},  // 1e-180
        {0xF468107100525890, 0xA5FB0A17C777CF09},  // 1e-179
        {0x7182148D4066EEB4, 0xCF79CC9DB955C2CC},  // 1e-178
        {0xC6F14CD848405530, 0x81AC1FE293D599BF},  // 1e-177
        {0xB8ADA00E5A506A7C, 0xA21727DB38CB002F},  // 1e-176
        {0xA6D90811F0E4851C, 0xCA9CF1D206FDC03B},  // 1e-175
        {0x908F4A166D1DA663, 0xFD442E4688BD304A},  // 1e-174
        {0x9A598E4E043287FE, 0x9E4A9CEC15763E2E},  // 1e-173
        {0x40EFF1E1853F29FD, 0xC5DD44271AD3CDBA},  // 1e-172
        {0xD12BEE59E68EF47C, 0xF7549530E188C128},  // 1e-171
        {0x82BB74F8301958CE, 0x9A94DD3E8CF578B9},  // 1e-170
        {0xE36A52363C1FAF01, 0xC13A148E3032D6E7},  // 1e-169
        {0xDC44E6C3CB279AC1, 0xF18899B1BC3F8CA1},  // 1e-168
        {0x29AB103A5EF8C0B9, 0x96F5600F15A7B7E5},  // 1e-167
        {0x7415D448F6B6F0E7, 0xBCB2B812DB11A5DE},  // 1e-166
        {0x111B495B3464AD21, 0xEBDF661791D60F56},  // 1e-165
        {0xCAB10DD900BEEC34, 0x936B9FCEBB25C995},  // 1e-164
        {0x3D5D514F40EEA742, 0xB84687C269EF3BFB},  // 1e-163
        {0x0CB4A5A3112A5112, 0xE65829B3046B0AFA},  // 1e-162
        {0x47F0E785EABA72AB, 0x8FF71A0FE2C2E6DC},  // 1e-161
        {0x59ED216765690F56, 0xB3F4E093DB73A093},  // 1e-160
        {0x306869C13EC3532C, 0xE0F218B8D25088B8},  // 1e-159
        {0x1E414218C73A13FB, 0x8C974F7383725573},  // 1e-158
        {0xE5D1929EF90898FA, 0xAFBD2350644EEACF},  // 1e-157
        {0xDF45F746B74ABF39, 0xDBAC6C247D62A583},  // 1e-156
        {0x6B8BBA8C328EB783, 0x894BC396CE5DA772},  // 1e-155
        {0x066EA92F3F326564, 0xAB9EB47C81F5114F},  // 1e-154
        {0xC80A537B0EFEFEBD, 0xD686619BA27255A2},  // 1e-153
        {0xBD06742CE95F5F36, 0x8613FD0145877585},  // 1e-152
        {0x2C48113823B73704, 0xA798FC4196E952E7},  // 1e-151
        {0xF75A15862CA504C5, 0xD17F3B51FCA3A7A0},  // 1e-150
        {0x9A984D73DBE722FB, 0x82EF85133DE648C4},  // 1e-149
        {0xC13E60D0D2E0EBBA, 0xA3AB66580D5FDAF5},  // 1e-148
        {0x318DF905079926A8, 0xCC963FEE10B7D1B3},  // 1e-147
        {0xFDF17746497F7052, 0xFFBBCFE994E5C61F},  // 1e-146
        {0xFEB6EA8BEDEFA633, 0x9FD561F1FD0F9BD3},  // 1e-145
        {0xFE64A52EE96B8FC0, 0xC7CABA6E7C5382C8},  // 1e-144
        {0x3DFDCE7AA3C673B0, 0xF9BD690A1B68637B},  // 1e-143
        {0x06BEA10CA65C084E, 0x9C1661A651213E2D},  // 1e-142
        {0x486E494FCFF30A62, 0xC31BFA0FE5698DB8},  // 1e-141
        {0x5A89DBA3C3EFCCFA, 0xF3E2F893DEC3F126},  // 1e-140
        {0xF89629465A75E01C, 0x986DDB5C6B3A76B7},  // 1e-139
        {0xF6BBB397F1135823, 0xBE89523386091465},  // 1e-138
        {0x746AA07DED582E2C, 0xEE2BA6C0678B597F},  // 1e-137
        {0xA8C2A44EB4571CDC, 0x94DB483840B717EF},  // 1e-136
        {0x92F34D62616CE413, 0xBA121A4650E4DDEB},  // 1e-135
        {0x77B020BAF9C81D17, 0xE896A0D7E51E1566},  // 1e-134
        {0x0ACE1474DC1D122E, 0x915E2486EF32CD60},  // 1e-133
        {0x0D819992132456BA, 0xB5B5ADA8AAFF80B8},  // 1e-132
        {0x10E1FFF697ED6C69, 0xE3231912D5BF60E6},  // 1e-131
        {0xCA8D3FFA1EF463C1, 0x8DF5EFABC5979C8F},  // 1e-130
        {0xBD308FF8A6B17CB2, 0xB1736B96B6FD83B3},  // 1e-129
        {0xAC7CB3F6D05DDBDE, 0xDDD0467C64BCE4A0},  // 1e-128
        {0x6BCDF07A423AA96B, 0x8AA22C0DBEF60EE4},  // 1e-127
        {0x86C16C98D2C953C6, 0xAD4AB7112EB3929D},  // 1e-126
        {0xE871C7BF077BA8B7, 0xD89D64D57A607744},  // 1e-125
        {0x11471CD764AD4972, 0x87625F056C7C4A8B},  // 1e-124
        {0xD598E40D3DD89BCF, 0xA93AF6C6C79B5D2D},  // 1e-123
        {0x4AFF1D108D4EC2C3, 0xD389B47879823479},  // 1e-122
        {0xCEDF722A585139BA, 0x843610CB4BF160CB},  // 1e-121
        {0xC2974EB4EE658828, 0xA54394FE1EEDB8FE},  // 1e-120
        {0x733D226229FEEA32, 0xCE947A3DA6A9273E},  // 1e-119
        {0x0806357D5A3F525F, 0x811CCC668829B887},  // 1e-118
        {0xCA07C2DCB0CF26F7, 0xA163FF802A3426A8},  // 1e-117
        {0xFC89B393DD02F0B5, 0xC9BCFF6034C13052},  // 1e-116
        {0xBBAC2078D443ACE2, 0xFC2C3F3841F17C67},  // 1e-115
        {0xD54B944B84AA4C0D, 0x9D9BA7832936EDC0},  // 1e-114
        {0x0A9E795E65D4DF11, 0xC5029163F384A931},  // 1e-113
        {0x4D4617B5FF4A16D5, 0xF64335BCF065D37D},  // 1e-112
        {0x504BCED1BF8E4E45, 0x99EA0196163FA42E},  // 1e-111
        {0xE45EC2862F71E1D6, 0xC06481FB9BCF8D39},  // 1e-110
        {0x5D767327BB4E5A4C, 0xF07DA27A82C37088},  // 1e-109
        {0x3A6A07F8D510F86F, 0x964E858C91BA2655},  // 1e-108
        {0x890489F70A55368B, 0xBBE226EFB628AFEA},  // 1e-107
        {0x2B45AC74CCEA842E, 0xEADAB0ABA3B2DBE5},  // 1e-106
        {0x3B0B8BC90012929D, 0x92C8AE6B464FC96F},  // 1e-105
        {0x09CE6EBB40173744, 0xB77ADA0617E3BBCB},  // 1e-104
        {0xCC420A6A101D0515, 0xE55990879DDCAABD},  // 1e-103
        {0x9FA946824A12232D, 0x8F57FA54C2A9EAB6},  // 1e-102
        {0x47939822DC96ABF9, 0xB32DF8E9F3546564},  // 1e-101
        {0x59787E2B93BC56F7, 0xDFF9772470297EBD},  // 1e-100
        {0x57EB4EDB3C55B65A, 0x8BFBEA76C619EF36},  // 1e-99
        {0xEDE622920B6B23F1, 0xAEFAE51477A06B03},  // 1e-98
        {0xE95FAB368E45ECED, 0xDAB99E59958885C4},  // 1e-97
        {0x11DBCB0218EBB414, 0x88B402F7FD75539B},  // 1e-96
        {0xD652BDC29F26A119, 0xAAE103B5FCD2A881},  // 1e-95
        {0x4BE76D3346F0495F, 0xD59944A37C0752A2},  // 1e-94
        {0x6F70A4400C562DDB, 0x857FCAE62D8493A5},  // 1e-93
        {0xCB4CCD500F6BB952, 0xA6DFBD9FB8E5B88E},  // 1e-92
        {0x7E2000A41346A7A7, 0xD097AD07A71F26B2},  // 1e-91
        {0x8ED400668C0C28C8, 0x825ECC24C873782F},  // 1e-90
        {0x728900802F0F32FA, 0xA2F67F2DFA90563B},  // 1e-89
        {0x4F2B40A03AD2FFB9, 0xCBB41EF979346BCA},  // 1e-88
        {0xE2F610C84987BFA8, 0xFEA126B7D78186BC},  // 1e-87
        {0x0DD9CA7D2DF4D7C9, 0x9F24B832E6B0F436},  // 1e-86
        {0x91503D1C79720DBB, 0xC6EDE63FA05D3143},  // 1e-85
        {0x75A44C6397CE912A, 0xF8A95FCF88747D94},  // 1e-84
        {0xC986AFBE3EE11ABA, 0x9B69DBE1B548CE7C},  // 1e-83
        {0xFBE85BADCE996168, 0xC24452DA229B021B},  // 1e-82
        {0xFAE27299423FB9C3, 0xF2D56790AB41C2A2},  // 1e-81
        {0xDCCD879FC967D41A, 0x97C560BA6B0919A5},  // 1e-80
        {0x5400E987BBC1C920, 0xBDB6B8E905CB600F},  // 1e-79
        {0x290123E9AAB23B68, 0xED246723473E3813},  // 1e-78
        {0xF9A0B6720AAF6521, 0x9436C0760C86E30B},  // 1e-77
        {0xF808E40E8D5B3E69, 0xB94470938FA89BCE},  // 1e-76
        {0xB60B1D1230B20E04, 0xE7958CB87392C2C2},  // 1e-75
        {0xB1C6F22B5E6F48C2, 0x90BD77F3483BB9B9},  // 1e-74
        {0x1E38AEB6360B1AF3, 0xB4ECD5F01A4AA828},  // 1e-73
        {0x25C6DA63C38DE1B0, 0xE2280B6C20DD5232},  // 1e-72
        {0x579C487E5A38AD0E, 0x8D590723948A535F},  // 1e-71
        {0x2D835A9DF0C6D851, 0xB0AF48EC79ACE837},  // 1e-70
        {0xF8E431456CF88E65, 0xDCDB1B2798182244},  // 1e-69
        {0x1B8E9ECB641B58FF, 0x8A08F0F8BF0F156B},  // 1e-68
        {0xE272467E3D222F3F, 0xAC8B2D36EED2DAC5},  // 1e-67
        {0x5B0ED81DCC6ABB0F, 0xD7ADF884AA879177},  // 1e-66
        {0x98E947129FC2B4E9, 0x86CCBB52EA94BAEA},  // 1e-65
        {0x3F2398D747B36224, 0xA87FEA27A539E9A5},  // 1e-64
        {0x8EEC7F0D19A03AAD, 0xD29FE4B18E88640E},  // 1e-63
        {0x1953CF68300424AC, 0x83A3EEEEF9153E89},  // 1e-62
        {0x5FA8C3423C052DD7, 0xA48CEAAAB75A8E2B},  // 1e-61
        {0x3792F412CB06794D, 0xCDB02555653131B6},  // 1e-60
        {0xE2BBD88BBEE40BD0, 0x808E17555F3EBF11},  // 1e-59
        {0x5B6ACEAEAE9D0EC4, 0xA0B19D2AB70E6ED6},  // 1e-58
        {0xF245825A5A445275, 0xC8DE047564D20A8B},  // 1e-57
        {0xEED6E2F0F0D56712, 0xFB158592BE068D2E},  // 1e-56
        {0x55464DD69685606B, 0x9CED737BB6C4183D},  // 1e-55
        {0xAA97E14C3C26B886, 0xC428D05AA4751E4C},  // 1e-54
        {0xD53DD99F4B3066A8, 0xF53304714D9265DF},  // 1e-53
        {0xE546A8038EFE4029, 0x993FE2C6D07B7FAB},  // 1e-52
        {0xDE98520472BDD033, 0xBF8FDB78849A5F96},  // 1e-51
        {0x963E66858F6D4440, 0xEF73D256A5C0F77C},  // 1e-50
        {0xDDE7001379A44AA8, 0x95A8637627989AAD},  // 1e-49
        {0x5560C018580D5D52, 0xBB127C53B17EC159},  // 1e-48
        {0xAAB8F01E6E10B4A6, 0xE9D71B689DDE71AF},  // 1e-47
        {0xCAB3961304CA70E8, 0x9226712162AB070D},  // 1e-46
        {0x3D607B97C5FD0D22, 0xB6B00D69BB55C8D1},  // 1e-45
        {0x8CB89A7DB77C506A, 0xE45C10C42A2B3B05},  // 1e-44
        {0x77F3608E92ADB242, 0x8EB98A7A9A5B04E3},  // 1e-43
        {0x55F038B237591ED3, 0xB267ED1940F1C61C},  // 1e-42
        {0x6B6C46DEC52F6688, 0xDF01E85F912E37A3},  // 1e-41
        {0x2323AC4B3B3DA015, 0x8B61313BBABCE2C6},  // 1e-40
        {0xABEC975E0A0D081A, 0xAE397D8AA96C1B77},  // 1e-39
        {0x96E7BD358C904A21, 0xD9C7DCED53C72255},  // 1e-38
        {0x7E50D64177DA2E54, 0x881CEA14545C7575},  // 1e-37
        {0xDDE50BD1D5D0B9E9, 0xAA242499697392D2},  // 1e-36
        {0x955E4EC64B44E864, 0xD4AD2DBFC3D07787},  // 1e-35
        {0xBD5AF13BEF0B113E, 0x84EC3C97DA624AB4},  // 1e-34
        {0xECB1AD8AEACDD58E, 0xA6274BBDD0FADD61},  // 1e-33
        {0x67DE18EDA5814AF2, 0xCFB11EAD453994BA},  // 1e-32
        {0x80EACF948770CED7, 0x81CEB32C4B43FCF4},  // 1e-31
        {0xA1258379A94D028D, 0xA2425FF75E14FC31},  // 1e-30
        {0x096EE45813A04330, 0xCAD2F7F5359A3B3E},  // 1e-29
        {0x8BCA9D6E188853FC, 0xFD87B5F28300CA0D},  // 1e-28
        {0x775EA264CF55347D, 0x9E74D1B791E07E48},  // 1e-27
        {0x95364AFE032A819D, 0xC612062576589DDA},  // 1e-26
        {0x3A83DDBD83F52204, 0xF79687AED3EEC551},  // 1e-25
        {0xC4926A9672793542, 0x9ABE14CD44753B52},  // 1e-24
        {0x75B7053C0F178293, 0xC16D9A0095928A27},  // 1e-23
        {0x5324C68B12DD6338, 0xF1C90080BAF72CB1},  // 1e-22
        {0xD3F6FC16EBCA5E03, 0x971DA05074DA7BEE},  // 1e-21
        {0x88F4BB1CA6BCF584, 0xBCE5086492111AEA},  // 1e-20
        {0x2B31E9E3D06C32E5, 0xEC1E4A7DB69561A5},  // 1e-19
        {0x3AFF322E62439FCF, 0x9392EE8E921D5D07},  // 1e-18
        {0x09BEFEB9FAD487C2, 0xB877AA3236A4B449},  // 1e-17
        {0x4C2EBE687989A9B3, 0xE69594BEC44DE15B},  // 1e-16
        {0x0F9D37014BF60A10, 0x901D7CF73AB0ACD9},  // 1e-15
        {0x538484C19EF38C94, 0xB424DC35095CD80F},  // 1e-14
        {0x2865A5F206B06FB9, 0xE12E13424BB40E13},  // 1e-13
        {0xF93F87B7442E45D3, 0x8CBCCC096F5088CB},  // 1e-12
        {0xF78F69A51539D748, 0xAFEBFF0BCB24AAFE},  // 1e-11
        {0xB573440E5A884D1B, 0xDBE6FECEBDEDD5BE},  // 1e-10
        {0x31680A88F8953030, 0x89705F4136B4A597},  // 1e-9
        {0xFDC20D2B36BA7C3D, 0xABCC77118461CEFC},  // 1e-8
        {0x3D32907604691B4C, 0xD6BF94D5E57A42BC},  // 1e-7
        {0xA63F9A49C2C1B10F, 0x8637BD05AF6C69B5},  // 1e-6
        {0x0FCF80DC33721D53, 0xA7C5AC471B478423},  // 1e-5
        {0xD3C36113404EA4A8, 0xD1B71758E219652B},  // 1e-4
        {0x645A1CAC083126E9, 0x83126E978D4FDF3B},  // 1e-3
        {0x3D70A3D70A3D70A3, 0xA3D70A3D70A3D70A},  // 1e-2
        {0xCCCCCCCCCCCCCCCC, 0xCCCCCCCCCCCCCCCC},  // 1e-1
        {0x0000000000000000, 0x8000000000000000},  // 1e0
        {0x0000000000000000, 0xA000000000000000},  // 1e1
        {0x0000000000000000, 0xC800000000000000},  // 1e2
        {0x0000000000000000, 0xFA00000000000000},  // 1e3
        {0x0000000000000000, 0x9C40000000000000},  // 1e4
        {0x0000000000000000, 0xC350000000000000},  // 1e5
        {0x0000000000000000, 0xF424000000000000},  // 1e6
        {0x0000000000000000, 0x9896800000000000},  // 1e7
        {0x0000000000000000, 0xBEBC200000000000},  // 1e8
        {0x0000000000000000, 0xEE6B280000000000},  // 1e9
        {0x0000000000000000, 0x9502F90000000000},  // 1e10
        {0x0000000000000000, 0xBA43B74000000000},  // 1e11
        {0x0000000000000000, 0xE8D4A51000000000},  // 1e12
        {0x0000000000000000, 0x9184E72A00000000},  // 1e13
        {0x0000000000000000, 0xB5E620F480000000},  // 1e14
        {0x0000000000000000, 0xE35FA931A0000000},  // 1e15
        {0x0000000000000000, 0x8E1BC9BF04000000},  // 1e16
        {0x0000000000000000, 0xB1A2BC2EC5000000},  // 1e17
        {0x0000000000000000, 0xDE0B6B3A76400000},  // 1e18
        {0x0000000000000000, 0x8AC7230489E80000},  // 1e19
        {0x0000000000000000, 0xAD78EBC5AC620000},  // 1e20
        {0x0000000000000000, 0xD8D726B7177A8000},  // 1e21
        {0x0000000000000000, 0x878678326EAC9000},  // 1e22
        {0x0000000000000000, 0xA968163F0A57B400},  // 1e23
        {0x0000000000000000, 0xD3C21BCECCEDA100},  // 1e24
        {0x0000000000000000, 0x84595161401484A0},  // 1e25
        {0x0000000000000000, 0xA56FA5B99019A5C8},  // 1e26
        {0x0000000000000000, 0xCECB8F27F4200F3A},  // 1e27
        {0x4000000000000000, 0x813F3978F8940984},  // 1e28
        {0x5000000000000000, 0xA18F07D736B90BE5},  // 1e29
        {0xA400000000000000, 0xC9F2C9CD04674EDE},  // 1e30
        {0x4D00000000000000, 0xFC6F7C4045812296},  // 1e31
        {0xF020000000000000, 0x9DC5ADA82B70B59D},  // 1e32
        {0x6C28000000000000, 0xC5371912364CE305},  // 1e33
        {0xC732000000000000, 0xF684DF56C3E01BC6},  // 1e34
        {0x3C7F400000000000, 0x9A130B963A6C115C},  // 1e35
        {0x4B9F100000000000, 0xC097CE7BC90715B3},  // 1e36
        {0x1E86D40000000000, 0xF0BDC21ABB48DB20},  // 1e37
        {0x1314448000000000, 0x96769950B50D88F4},  // 1e38
        {0x17D955A000000000, 0xBC143FA4E250EB31},  // 1e39
        {0x5DCFAB0800000000, 0xEB194F8E1AE525FD},  // 1e40
        {0x5AA1CAE500000000, 0x92EFD1B8D0CF37BE},  // 1e41
        {0xF14A3D9E40000000, 0xB7ABC627050305AD},  // 1e42
        {0x6D9CCD05D0000000, 0xE596B7B0C643C719},  // 1e43
        {0xE4820023A2000000, 0x8F7E32CE7BEA5C6F},  // 1e44
        {0xDDA2802C8A800000, 0xB35DBF821AE4F38B},  // 1e45
        {0xD50B2037AD200000, 0xE0352F62A19E306E},  // 1e46
        {0x4526F422CC340000, 0x8C213D9DA502DE45},  // 1e47
        {0x9670B12B7F410000, 0xAF298D050E4395D6},  // 1e48
        {0x3C0CDD765F114000, 0xDAF3F04651D47B4C},  // 1e49
        {0xA5880A69FB6AC800, 0x88D8762BF324CD0F},  // 1e50
        {0x8EEA0D047A457A00, 0xAB0E93B6EFEE0053},  // 1e51
        {0x72A4904598D6D880, 0xD5D238A4ABE98068},  // 1e52
        {0x47A6DA2B7F864750, 0x85A36366EB71F041},  // 1e53
        {0x999090B65F67D924, 0xA70C3C40A64E6C51},  // 1e54
        {0xFFF4B4E3F741CF6D, 0xD0CF4B50CFE20765},  // 1e55
        {0xBFF8F10E7A8921A4, 0x82818F1281ED449F},  // 1e56
        {0xAFF72D52192B6A0D, 0xA321F2D7226895C7},  // 1e57
        {0x9BF4F8A69F764490, 0xCBEA6F8CEB02BB39},  // 1e58
        {0x02F236D04753D5B4, 0xFEE50B7025C36A08},  // 1e59
        {0x01D762422C946590, 0x9F4F2726179A2245},  // 1e60
        {0x424D3AD2B7B97EF5, 0xC722F0EF9D80AAD6},  // 1e61
        {0xD2E0898765A7DEB2, 0xF8EBAD2B84E0D58B},  // 1e62
        {0x63CC55F49F88EB2F, 0x9B934C3B330C8577},  // 1e63
        {0x3CBF6B71C76B25FB, 0xC2781F49FFCFA6D5},  // 1e64
        {0x8BEF464E3945EF7A, 0xF316271C7FC3908A},  // 1e65
        {0x97758BF0E3CBB5AC, 0x97EDD871CFDA3A56},  // 1e66
        {0x3D52EEED1CBEA317, 0xBDE94E8E43D0C8EC},  // 1e67
        {0x4CA7AAA863EE4BDD, 0xED63A231D4C4FB27},  // 1e68
        {0x8FE8CAA93E74EF6A, 0x945E455F24FB1CF8},  // 1e69
        {0xB3E2FD538E122B44, 0xB975D6B6EE39E436},  // 1e70
        {0x60DBBCA87196B616, 0xE7D34C64A9C85D44},  // 1e71
        {0xBC8955E946FE31CD, 0x90E40FBEEA1D3A4A},  // 1e72
        {0x6BABAB6398BDBE41, 0xB51D13AEA4A488DD},  // 1e73
        {0xC696963C7EED2DD1, 0xE264589A4DCDAB14},  // 1e74
        {0xFC1E1DE5CF543CA2, 0x8D7EB76070A08AEC},  // 1e75
        {0x3B25A55F43294BCB, 0xB0DE65388CC8ADA8},  // 1e76
        {0x49EF0EB713F39EBE, 0xDD15FE86AFFAD912},  // 1e77
        {0x6E3569326C784337, 0x8A2DBF142DFCC7AB},  // 1e78
        {0x49C2C37F07965404, 0xACB92ED9397BF996},  // 1e79
        {0xDC33745EC97BE906, 0xD7E77A8F87DAF7FB},  // 1e80
        {0x69A028BB3DED71A3, 0x86F0AC99B4E8DAFD},  // 1e81
        {0xC40832EA0D68CE0C, 0xA8ACD7C0222311BC},  // 1e82
        {0xF50A3FA490C30190, 0xD2D80DB02AABD62B},  // 1e83
        {0x792667C6DA79E0FA, 0x83C7088E1AAB65DB},  // 1e84
        {0x577001B891185938, 0xA4B8CAB1A1563F52},  // 1e85
        {0xED4C0226B55E6F86, 0xCDE6FD5E09ABCF26},  // 1e86
        {0x544F8158315B05B4, 0x80B05E5AC60B6178},  // 1e87
        {0x696361AE3DB1C721, 0xA0DC75F1778E39D6},  // 1e88
        {0x03BC3A19CD1E38E9, 0xC913936DD571C84C},  // 1e89
        {0x04AB48A04065C723, 0xFB5878494ACE3A5F},  // 1e90
        {0x62EB0D64283F9C76, 0x9D174B2DCEC0E47B},  // 1e91
        {0x3BA5D0BD324F8394, 0xC45D1DF942711D9A},  // 1e92
        {0xCA8F44EC7EE36479, 0xF5746577930D6500},  // 1e93
        {0x7E998B13CF4E1ECB, 0x9968BF6ABBE85F20},  // 1e94
        {0x9E3FEDD8C321A67E, 0xBFC2EF456AE276E8},  // 1e95
        {0xC5CFE94EF3EA101E, 0xEFB3AB16C59B14A2},  // 1e96
        {0xBBA1F1D158724A12, 0x95D04AEE3B80ECE5},  // 1e97
        {0x2A8A6E45AE8EDC97, 0xBB445DA9CA61281F},  // 1e98
        {0xF52D09D71A3293BD, 0xEA1575143CF97226},  // 1e99
        {0x593C2626705F9C56, 0x924D692CA61BE758},  // 1e100
        {0x6F8B2FB00C77836C, 0xB6E0C377CFA2E12E},  // 1e101
        {0x0B6DFB9C0F956447, 0xE498F455C38B997A},  // 1e102
        {0x4724BD4189BD5EAC, 0x8EDF98B59A373FEC},  // 1e103
        {0x58EDEC91EC2CB657, 0xB2977EE300C50FE7},  // 1e104
        {0x2F2967B66737E3ED, 0xDF3D5E9BC0F653E1},  // 1e105
        {0xBD79E0D20082EE74, 0x8B865B215899F46C},  // 1e106
        {0xECD8590680A3AA11, 0xAE67F1E9AEC07187},  // 1e107
        {0xE80E6F4820CC9495, 0xDA01EE641A708DE9},  // 1e108
        {0x3109058D147FDCDD, 0x884134FE908658B2},  // 1e109
        {0xBD4B46F0599FD415, 0xAA51823E34A7EEDE},  // 1e110
        {0x6C9E18AC7007C91A, 0xD4E5E2CDC1D1EA96},  // 1e111
        {0x03E2CF6BC604DDB0, 0x850FADC09923329E},  // 1e112
        {0x84DB8346B786151C, 0xA6539930BF6BFF45},  // 1e113
        {0xE612641865679A63, 0xCFE87F7CEF46FF16},  // 1e114
        {0x4FCB7E8F3F60C07E, 0x81F14FAE158C5F6E},  // 1e115
        {0xE3BE5E330F38F09D, 0xA26DA3999AEF7749},  // 1e116
        {0x5CADF5BFD3072CC5, 0xCB090C8001AB551C},  // 1e117
        {0x73D9732FC7C8F7F6, 0xFDCB4FA002162A63},  // 1e118
        {0x2867E7FDDCDD9AFA, 0x9E9F11C4014DDA7E},  // 1e119
        {0xB281E1FD541501B8, 0xC646D63501A1511D},  // 1e120
        {0x1F225A7CA91A4226, 0xF7D88BC24209A565},  // 1e121
        {0x3375788DE9B06958, 0x9AE757596946075F},  // 1e122
        {0x0052D6B1641C83AE, 0xC1A12D2FC3978937},  // 1e123
        {0xC0678C5DBD23A49A, 0xF209787BB47D6B84},  // 1e124
        {0xF840B7BA963646E0, 0x9745EB4D50CE6332},  // 1e125
        {0xB650E5A93BC3D898, 0xBD176620A501FBFF},  // 1e126
        {0xA3E51F138AB4CEBE, 0xEC5D3FA8CE427AFF},  // 1e127
        {0xC66F336C36B10137, 0x93BA47C980E98CDF},  // 1e128
        {0xB80B0047445D4184, 0xB8A8D9BBE123F017},  // 1e129
        {0xA60DC059157491E5, 0xE6D3102AD96CEC1D},  // 1e130
        {0x87C89837AD68DB2F, 0x9043EA1AC7E41392},  // 1e131
        {0x29BABE4598C311FB, 0xB454E4A179DD1877},  // 1e132
        {0xF4296DD6FEF3D67A, 0xE16A1DC9D8545E94},  // 1e133
        {0x1899E4A65F58660C, 0x8CE2529E2734BB1D},  // 1e134
        {0x5EC05DCFF72E7F8F, 0xB01AE745B101E9E4},  // 1e135
        {0x76707543F4FA1F73, 0xDC21A1171D42645D},  // 1e136
        {0x6A06494A791C53A8, 0x899504AE72497EBA},  // 1e137
        {0x0487DB9D17636892, 0xABFA45DA0EDBDE69},  // 1e138
        {0x45A9D2845D3C42B6, 0xD6F8D7509292D603},  // 1e139
        {0x0B8A2392BA45A9B2, 0x865B86925B9BC5C2},  // 1e140
        {0x8E6CAC7768D7141E, 0xA7F26836F282B732},  // 1e141
        {0x3207D795430CD926, 0xD1EF0244AF2364FF},  // 1e142
        {0x7F44E6BD49E807B8, 0x8335616AED761F1F},  // 1e143
        {0x5F16206C9C6209A6, 0xA402B9C5A8D3A6E7},  // 1e144
        {0x36DBA887C37A8C0F, 0xCD036837130890A1},  // 1e145
        {0xC2494954DA2C9789, 0x802221226BE55A64},  // 1e146
        {0xF2DB9BAA10B7BD6C, 0xA02AA96B06DEB0FD},  // 1e147
        {0x6F92829494E5ACC7, 0xC83553C5C8965D3D},  // 1e148
        {0xCB772339BA1F17F9, 0xFA42A8B73ABBF48C},  // 1e149
        {0xFF2A760414536EFB, 0x9C69A97284B578D7},  // 1e150
        {0xFEF5138519684ABA, 0xC38413CF25E2D70D},  // 1e151
        {0x7EB258665FC25D69, 0xF46518C2EF5B8CD1},  // 1e152
        {0xEF2F773FFBD97A61, 0x98BF2F79D5993802},  // 1e153
        {0xAAFB550FFACFD8FA, 0xBEEEFB584AFF8603},  // 1e154
        {0x95BA2A53F983CF38, 0xEEAABA2E5DBF6784},  // 1e155
        {0xDD945A747BF26183, 0x952AB45CFA97A0B2},  // 1e156
        {0x94F971119AEEF9E4, 0xBA756174393D88DF},  // 1e157
        {0x7A37CD5601AAB85D, 0xE912B9D1478CEB17},  // 1e158
        {0xAC62E055C10AB33A, 0x91ABB422CCB812EE},  // 1e159
        {0x577B986B314D6009, 0xB616A12B7FE617AA},  // 1e160
        {0xED5A7E85FDA0B80B, 0xE39C49765FDF9D94},  // 1e161
        {0x14588F13BE847307, 0x8E41ADE9FBEBC27D},  // 1e162
        {0x596EB2D8AE258FC8, 0xB1D219647AE6B31C},  // 1e163
        {0x6FCA5F8ED9AEF3BB, 0xDE469FBD99A05FE3},  // 1e164
        {0x25DE7BB9480D5854, 0x8AEC23D680043BEE},  // 1e165
        {0xAF561AA79A10AE6A, 0xADA72CCC20054AE9},  // 1e166
        {0x1B2BA1518094DA04, 0xD910F7FF28069DA4},  // 1e167
        {0x90FB44D2F05D0842, 0x87AA9AFF79042286},  // 1e168
        {0x353A1607AC744A53, 0xA99541BF57452B28},  // 1e169
        {0x42889B8997915CE8, 0xD3FA922F2D1675F2},  // 1e170
        {0x69956135FEBADA11, 0x847C9B5D7C2E09B7},  // 1e171
        {0x43FAB9837E699095, 0xA59BC234DB398C25},  // 1e172
        {0x94F967E45E03F4BB, 0xCF02B2C21207EF2E},  // 1e173
        {0x1D1BE0EEBAC278F5, 0x8161AFB94B44F57D},  // 1e174
        {0x6462D92A69731732, 0xA1BA1BA79E1632DC},  // 1e175
        {0x7D7B8F7503CFDCFE, 0xCA28A291859BBF93},  // 1e176
        {0x5CDA735244C3D43E, 0xFCB2CB35E702AF78},  // 1e177
        {0x3A0888136AFA64A7, 0x9DEFBF01B061ADAB},  // 1e178
        {0x088AAA1845B8FDD0, 0xC56BAEC21C7A1916},  // 1e179
        {0x8AAD549E57273D45, 0xF6C69A72A3989F5B},  // 1e180
        {0x36AC54E2F678864B, 0x9A3C2087A63F6399},  // 1e181
        {0x84576A1BB416A7DD, 0xC0CB28A98FCF3C7F},  // 1e182
        {0x656D44A2A11C51D5, 0xF0FDF2D3F3C30B9F},  // 1e183
        {0x9F644AE5A4B1B325, 0x969EB7C47859E743},  // 1e184
        {0x873D5D9F0DDE1FEE, 0xBC4665B596706114},  // 1e185
        {0xA90CB506D155A7EA, 0xEB57FF22FC0C7959},  // 1e186
        {0x09A7F12442D588F2, 0x9316FF75DD87CBD8},  // 1e187
        {0x0C11ED6D538AEB2F, 0xB7DCBF5354E9BECE},  // 1e188
        {0x8F1668C8A86DA5FA, 0xE5D3EF282A242E81},  // 1e189
        {0xF96E017D694487BC, 0x8FA475791A569D10},  // 1e190
        {0x37C981DCC395A9AC, 0xB38D92D760EC4455},  // 1e191
        {0x85BBE253F47B1417, 0xE070F78D3927556A},  // 1e192
        {0x93956D7478CCEC8E, 0x8C469AB843B89562},  // 1e193
        {0x387AC8D1970027B2, 0xAF58416654A6BABB},  // 1e194
        {0x06997B05FCC0319E, 0xDB2E51BFE9D0696A},  // 1e195
        {0x441FECE3BDF81F03, 0x88FCF317F22241E2},  // 1e196
        {0xD527E81CAD7626C3, 0xAB3C2FDDEEAAD25A},  // 1e197
        {0x8A71E223D8D3B074, 0xD60B3BD56A5586F1},  // 1e198
        {0xF6872D5667844E49, 0x85C7056562757456},  // 1e199
        {0xB428F8AC016561DB, 0xA738C6BEBB12D16C},  // 1e200
        {0xE13336D701BEBA52, 0xD106F86E69D785C7},  // 1e201
        {0xECC0024661173473, 0x82A45B450226B39C},  // 1e202
        {0x27F002D7F95D0190, 0xA34D721642B06084},  // 1e203
        {0x31EC038DF7B441F4, 0xCC20CE9BD35C78A5},  // 1e204
        {0x7E67047175A15271, 0xFF290242C83396CE},  // 1e205
        {0x0F0062C6E984D386, 0x9F79A169BD203E41},  // 1e206
        {0x52C07B78A3E60868, 0xC75809C42C684DD1},  // 1e207
        {0xA7709A56CCDF8A82, 0xF92E0C3537826145},  // 1e208
        {0x88A66076400BB691, 0x9BBCC7A142B17CCB},  // 1e209
        {0x6ACFF893D00EA435, 0xC2ABF989935DDBFE},  // 1e210
        {0x0583F6B8C4124D43, 0xF356F7EBF83552FE},  // 1e211
        {0xC3727A337A8B704A, 0x98165AF37B2153DE},  // 1e212
        {0x744F18C0592E4C5C, 0xBE1BF1B059E9A8D6},  // 1e213
        {0x1162DEF06F79DF73, 0xEDA2EE1C7064130C},  // 1e214
        {0x8ADDCB5645AC2BA8, 0x9485D4D1C63E8BE7},  // 1e215
        {0x6D953E2BD7173692, 0xB9A74A0637CE2EE1},  // 1e216
        {0xC8FA8DB6CCDD0437, 0xE8111C87C5C1BA99},  // 1e217
        {0x1D9C9892400A22A2, 0x910AB1D4DB9914A0},  // 1e218
        {0x2503BEB6D00CAB4B, 0xB54D5E4A127F59C8},  // 1e219
        {0x2E44AE64840FD61D, 0xE2A0B5DC971F303A},  // 1e220
        {0x5CEAECFED289E5D2, 0x8DA471A9DE737E24},  // 1e221
        {0x7425A83E872C5F47, 0xB10D8E1456105DAD},  // 1e222
        {0xD12F124E28F77719, 0xDD50F1996B947518},  // 1e223
        {0x82BD6B70D99AAA6F, 0x8A5296FFE33CC92F},  // 1e224
        {0x636CC64D1001550B, 0xACE73CBFDC0BFB7B},  // 1e225
        {0x3C47F7E05401AA4E, 0xD8210BEFD30EFA5A},  // 1e226
        {0x65ACFAEC34810A71, 0x8714A775E3E95C78},  // 1e227
        {0x7F1839A741A14D0D, 0xA8D9D1535CE3B396},  // 1e228
        {0x1EDE48111209A050, 0xD31045A8341CA07C},  // 1e229
        {0x934AED0AAB460432, 0x83EA2B892091E44D},  // 1e230
        {0xF81DA84D5617853F, 0xA4E4B66B68B65D60},  // 1e231
        {0x36251260AB9D668E, 0xCE1DE40642E3F4B9},  // 1e232
        {0xC1D72B7C6B426019, 0x80D2AE83E9CE78F3},  // 1e233
        {0xB24CF65B8612F81F, 0xA1075A24E4421730},  // 1e234
        {0xDEE033F26797B627, 0xC94930AE1D529CFC},  // 1e235
        {0x169840EF017DA3B1, 0xFB9B7CD9A4A7443C},  // 1e236
        {0x8E1F289560EE864E, 0x9D412E0806E88AA5},  // 1e237
        {0xF1A6F2BAB92A27E2, 0xC491798A08A2AD4E},  // 1e238
        {0xAE10AF696774B1DB, 0xF5B5D7EC8ACB58A2},  // 1e239
        {0xACCA6DA1E0A8EF29, 0x9991A6F3D6BF1765},  // 1e240
        {0x17FD090A58D32AF3, 0xBFF610B0CC6EDD3F},  // 1e241
        {0xDDFC4B4CEF07F5B0, 0xEFF394DCFF8A948E},  // 1e242
        {0x4ABDAF101564F98E, 0x95F83D0A1FB69CD9},  // 1e243
        {0x9D6D1AD41ABE37F1, 0xBB764C4CA7A4440F},  // 1e244
        {0x84C86189216DC5ED, 0xEA53DF5FD18D5513},  // 1e245
        {0x32FD3CF5B4E49BB4, 0x92746B9BE2F8552C},  // 1e246
        {0x3FBC8C33221DC2A1, 0xB7118682DBB66A77},  // 1e247
        {0x0FABAF3FEAA5334A, 0xE4D5E82392A40515},  // 1e248
        {0x29CB4D87F2A7400E, 0x8F05B1163BA6832D},  // 1e249
        {0x743E20E9EF511012, 0xB2C71D5BCA9023F8},  // 1e250
        {0x914DA9246B255416, 0xDF78E4B2BD342CF6},  // 1e251
        {0x1AD089B6C2F7548E, 0x8BAB8EEFB6409C1A},  // 1e252
        {0xA184AC2473B529B1, 0xAE9672ABA3D0C320},  // 1e253
        {0xC9E5D72D90A2741E, 0xDA3C0F568CC4F3E8},  // 1e254
        {0x7E2FA67C7A658892, 0x8865899617FB1871},  // 1e255
        {0xDDBB901B98FEEAB7, 0xAA7EEBFB9DF9DE8D},  // 1e256
        {0x552A74227F3EA565, 0xD51EA6FA85785631},  // 1e257
        {0xD53A88958F87275F, 0x8533285C936B35DE},  // 1e258
        {0x8A892ABAF368F137, 0xA67FF273B8460356},  // 1e259
        {0x2D2B7569B0432D85, 0xD01FEF10A657842C},  // 1e260
        {0x9C3B29620E29FC73, 0x8213F56A67F6B29B},  // 1e261
        {0x8349F3BA91B47B8F, 0xA298F2C501F45F42},  // 1e262
        {0x241C70A936219A73, 0xCB3F2F7642717713},  // 1e263
        {0xED238CD383AA0110, 0xFE0EFB53D30DD4D7},  // 1e264
        {0xF4363804324A40AA, 0x9EC95D1463E8A506},  // 1e265
        {0xB143C6053EDCD0D5, 0xC67BB4597CE2CE48},  // 1e266
        {0xDD94B7868E94050A, 0xF81AA16FDC1B81DA},  // 1e267
        {0xCA7CF2B4191C8326, 0x9B10A4E5E9913128},  // 1e268
        {0xFD1C2F611F63A3F0, 0xC1D4CE1F63F57D72},  // 1e269
        {0xBC633B39673C8CEC, 0xF24A01A73CF2DCCF},  // 1e270
        {0xD5BE0503E085D813, 0x976E41088617CA01},  // 1e271
        {0x4B2D8644D8A74E18, 0xBD49D14AA79DBC82},  // 1e272
        {0xDDF8E7D60ED1219E, 0xEC9C459D51852BA2},  // 1e273
        {0xCABB90E5C942B503, 0x93E1AB8252F33B45},  // 1e274
        {0x3D6A751F3B936243, 0xB8DA1662E7B00A17},  // 1e275
        {0x0CC512670A783AD4, 0xE7109BFBA19C0C9D},  // 1e276
        {0x27FB2B80668B24C5, 0x906A617D450187E2},  // 1e277
        {0xB1F9F660802DEDF6, 0xB484F9DC9641E9DA},  // 1e278
        {0x5E7873F8A0396973, 0xE1A63853BBD26451},  // 1e279
        {0xDB0B487B6423E1E8, 0x8D07E33455637EB2},  // 1e280
        {0x91CE1A9A3D2CDA62, 0xB049DC016ABC5E5F},  // 1e281
        {0x7641A140CC7810FB, 0xDC5C5301C56B75F7},  // 1e282
        {0xA9E904C87FCB0A9D, 0x89B9B3E11B6329BA},  // 1e283
        {0x546345FA9FBDCD44, 0xAC2820D9623BF429},  // 1e284
        {0xA97C177947AD4095, 0xD732290FBACAF133},  // 1e285
        {0x49ED8EABCCCC485D, 0x867F59A9D4BED6C0},  // 1e286
        {0x5C68F256BFFF5A74, 0xA81F301449EE8C70},  // 1e287
        {0x73832EEC6FFF3111, 0xD226FC195C6A2F8C},  // 1e288
};

// wuffs_base__private_implementation__f64_powers_of_10 holds powers of 10 that
// can be exactly represented by a float64 (what C calls a double).
static const double wuffs_base__private_implementation__f64_powers_of_10[23] = {
    1e0,  1e1,  1e2,  1e3,  1e4,  1e5,  1e6,  1e7,  1e8,  1e9,  1e10, 1e11,
    1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19, 1e20, 1e21, 1e22,
};

// ---------------- IEEE 754 Floating Point

WUFFS_BASE__MAYBE_STATIC wuffs_base__lossy_value_u16  //
wuffs_base__ieee_754_bit_representation__from_f64_to_u16_truncate(double f) {
  uint64_t u = 0;
  if (sizeof(uint64_t) == sizeof(double)) {
    memcpy(&u, &f, sizeof(uint64_t));
  }
  uint16_t neg = ((uint16_t)((u >> 63) << 15));
  u &= 0x7FFFFFFFFFFFFFFF;
  uint64_t exp = u >> 52;
  uint64_t man = u & 0x000FFFFFFFFFFFFF;

  if (exp == 0x7FF) {
    if (man == 0) {  // Infinity.
      wuffs_base__lossy_value_u16 ret;
      ret.value = neg | 0x7C00;
      ret.lossy = false;
      return ret;
    }
    // NaN. Shift the 52 mantissa bits to 10 mantissa bits, keeping the most
    // significant mantissa bit (quiet vs signaling NaNs). Also set the low 9
    // bits of ret.value so that the 10-bit mantissa is non-zero.
    wuffs_base__lossy_value_u16 ret;
    ret.value = neg | 0x7DFF | ((uint16_t)(man >> 42));
    ret.lossy = false;
    return ret;

  } else if (exp > 0x40E) {  // Truncate to the largest finite f16.
    wuffs_base__lossy_value_u16 ret;
    ret.value = neg | 0x7BFF;
    ret.lossy = true;
    return ret;

  } else if (exp <= 0x3E6) {  // Truncate to zero.
    wuffs_base__lossy_value_u16 ret;
    ret.value = neg;
    ret.lossy = (u != 0);
    return ret;

  } else if (exp <= 0x3F0) {  // Normal f64, subnormal f16.
    // Convert from a 53-bit mantissa (after realizing the implicit bit) to a
    // 10-bit mantissa and then adjust for the exponent.
    man |= 0x0010000000000000;
    uint32_t shift = ((uint32_t)(1051 - exp));  // 1051 = 0x3F0 + 53 - 10.
    uint64_t shifted_man = man >> shift;
    wuffs_base__lossy_value_u16 ret;
    ret.value = neg | ((uint16_t)shifted_man);
    ret.lossy = (shifted_man << shift) != man;
    return ret;
  }

  // Normal f64, normal f16.

  // Re-bias from 1023 to 15 and shift above f16's 10 mantissa bits.
  exp = (exp - 1008) << 10;  // 1008 = 1023 - 15 = 0x3FF - 0xF.

  // Convert from a 52-bit mantissa (excluding the implicit bit) to a 10-bit
  // mantissa (again excluding the implicit bit). We lose some information if
  // any of the bottom 42 bits are non-zero.
  wuffs_base__lossy_value_u16 ret;
  ret.value = neg | ((uint16_t)exp) | ((uint16_t)(man >> 42));
  ret.lossy = (man << 22) != 0;
  return ret;
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__lossy_value_u32  //
wuffs_base__ieee_754_bit_representation__from_f64_to_u32_truncate(double f) {
  uint64_t u = 0;
  if (sizeof(uint64_t) == sizeof(double)) {
    memcpy(&u, &f, sizeof(uint64_t));
  }
  uint32_t neg = ((uint32_t)(u >> 63)) << 31;
  u &= 0x7FFFFFFFFFFFFFFF;
  uint64_t exp = u >> 52;
  uint64_t man = u & 0x000FFFFFFFFFFFFF;

  if (exp == 0x7FF) {
    if (man == 0) {  // Infinity.
      wuffs_base__lossy_value_u32 ret;
      ret.value = neg | 0x7F800000;
      ret.lossy = false;
      return ret;
    }
    // NaN. Shift the 52 mantissa bits to 23 mantissa bits, keeping the most
    // significant mantissa bit (quiet vs signaling NaNs). Also set the low 22
    // bits of ret.value so that the 23-bit mantissa is non-zero.
    wuffs_base__lossy_value_u32 ret;
    ret.value = neg | 0x7FBFFFFF | ((uint32_t)(man >> 29));
    ret.lossy = false;
    return ret;

  } else if (exp > 0x47E) {  // Truncate to the largest finite f32.
    wuffs_base__lossy_value_u32 ret;
    ret.value = neg | 0x7F7FFFFF;
    ret.lossy = true;
    return ret;

  } else if (exp <= 0x369) {  // Truncate to zero.
    wuffs_base__lossy_value_u32 ret;
    ret.value = neg;
    ret.lossy = (u != 0);
    return ret;

  } else if (exp <= 0x380) {  // Normal f64, subnormal f32.
    // Convert from a 53-bit mantissa (after realizing the implicit bit) to a
    // 23-bit mantissa and then adjust for the exponent.
    man |= 0x0010000000000000;
    uint32_t shift = ((uint32_t)(926 - exp));  // 926 = 0x380 + 53 - 23.
    uint64_t shifted_man = man >> shift;
    wuffs_base__lossy_value_u32 ret;
    ret.value = neg | ((uint32_t)shifted_man);
    ret.lossy = (shifted_man << shift) != man;
    return ret;
  }

  // Normal f64, normal f32.

  // Re-bias from 1023 to 127 and shift above f32's 23 mantissa bits.
  exp = (exp - 896) << 23;  // 896 = 1023 - 127 = 0x3FF - 0x7F.

  // Convert from a 52-bit mantissa (excluding the implicit bit) to a 23-bit
  // mantissa (again excluding the implicit bit). We lose some information if
  // any of the bottom 29 bits are non-zero.
  wuffs_base__lossy_value_u32 ret;
  ret.value = neg | ((uint32_t)exp) | ((uint32_t)(man >> 29));
  ret.lossy = (man << 35) != 0;
  return ret;
}

// --------

#define WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE 2047
#define WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION 800

// WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL is the largest N
// such that ((10 << N) < (1 << 64)).
#define WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL 60

// wuffs_base__private_implementation__high_prec_dec (abbreviated as HPD) is a
// fixed precision floating point decimal number, augmented with ±infinity
// values, but it cannot represent NaN (Not a Number).
//
// "High precision" means that the mantissa holds 800 decimal digits. 800 is
// WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION.
//
// An HPD isn't for general purpose arithmetic, only for conversions to and
// from IEEE 754 double-precision floating point, where the largest and
// smallest positive, finite values are approximately 1.8e+308 and 4.9e-324.
// HPD exponents above +2047 mean infinity, below -2047 mean zero. The ±2047
// bounds are further away from zero than ±(324 + 800), where 800 and 2047 is
// WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION and
// WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE.
//
// digits[.. num_digits] are the number's digits in big-endian order. The
// uint8_t values are in the range [0 ..= 9], not ['0' ..= '9'], where e.g. '7'
// is the ASCII value 0x37.
//
// decimal_point is the index (within digits) of the decimal point. It may be
// negative or be larger than num_digits, in which case the explicit digits are
// padded with implicit zeroes.
//
// For example, if num_digits is 3 and digits is "\x07\x08\x09":
//   - A decimal_point of -2 means ".00789"
//   - A decimal_point of -1 means ".0789"
//   - A decimal_point of +0 means ".789"
//   - A decimal_point of +1 means "7.89"
//   - A decimal_point of +2 means "78.9"
//   - A decimal_point of +3 means "789."
//   - A decimal_point of +4 means "7890."
//   - A decimal_point of +5 means "78900."
//
// As above, a decimal_point higher than +2047 means that the overall value is
// infinity, lower than -2047 means zero.
//
// negative is a sign bit. An HPD can distinguish positive and negative zero.
//
// truncated is whether there are more than
// WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION digits, and at
// least one of those extra digits are non-zero. The existence of long-tail
// digits can affect rounding.
//
// The "all fields are zero" value is valid, and represents the number +0.
typedef struct wuffs_base__private_implementation__high_prec_dec__struct {
  uint32_t num_digits;
  int32_t decimal_point;
  bool negative;
  bool truncated;
  uint8_t digits[WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION];
} wuffs_base__private_implementation__high_prec_dec;

// wuffs_base__private_implementation__high_prec_dec__trim trims trailing
// zeroes from the h->digits[.. h->num_digits] slice. They have no benefit,
// since we explicitly track h->decimal_point.
//
// Preconditions:
//  - h is non-NULL.
static inline void  //
wuffs_base__private_implementation__high_prec_dec__trim(
    wuffs_base__private_implementation__high_prec_dec* h) {
  while ((h->num_digits > 0) && (h->digits[h->num_digits - 1] == 0)) {
    h->num_digits--;
  }
}

// wuffs_base__private_implementation__high_prec_dec__assign sets h to
// represent the number x.
//
// Preconditions:
//  - h is non-NULL.
static void  //
wuffs_base__private_implementation__high_prec_dec__assign(
    wuffs_base__private_implementation__high_prec_dec* h,
    uint64_t x,
    bool negative) {
  uint32_t n = 0;

  // Set h->digits.
  if (x > 0) {
    // Calculate the digits, working right-to-left. After we determine n (how
    // many digits there are), copy from buf to h->digits.
    //
    // UINT64_MAX, 18446744073709551615, is 20 digits long. It can be faster to
    // copy a constant number of bytes than a variable number (20 instead of
    // n). Make buf large enough (and start writing to it from the middle) so
    // that can we always copy 20 bytes: the slice buf[(20-n) .. (40-n)].
    uint8_t buf[40] = {0};
    uint8_t* ptr = &buf[20];
    do {
      uint64_t remaining = x / 10;
      x -= remaining * 10;
      ptr--;
      *ptr = (uint8_t)x;
      n++;
      x = remaining;
    } while (x > 0);
    memcpy(h->digits, ptr, 20);
  }

  // Set h's other fields.
  h->num_digits = n;
  h->decimal_point = (int32_t)n;
  h->negative = negative;
  h->truncated = false;
  wuffs_base__private_implementation__high_prec_dec__trim(h);
}

static wuffs_base__status  //
wuffs_base__private_implementation__high_prec_dec__parse(
    wuffs_base__private_implementation__high_prec_dec* h,
    wuffs_base__slice_u8 s,
    uint32_t options) {
  if (!h) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  h->num_digits = 0;
  h->decimal_point = 0;
  h->negative = false;
  h->truncated = false;

  uint8_t* p = s.ptr;
  uint8_t* q = s.ptr + s.len;

  if (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES) {
    for (;; p++) {
      if (p >= q) {
        return wuffs_base__make_status(wuffs_base__error__bad_argument);
      } else if (*p != '_') {
        break;
      }
    }
  }

  // Parse sign.
  do {
    if (*p == '+') {
      p++;
    } else if (*p == '-') {
      h->negative = true;
      p++;
    } else {
      break;
    }
    if (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES) {
      for (;; p++) {
        if (p >= q) {
          return wuffs_base__make_status(wuffs_base__error__bad_argument);
        } else if (*p != '_') {
          break;
        }
      }
    }
  } while (0);

  // Parse digits, up to (and including) a '.', 'E' or 'e'. Examples for each
  // limb in this if-else chain:
  //  - "0.789"
  //  - "1002.789"
  //  - ".789"
  //  - Other (invalid input).
  uint32_t nd = 0;
  int32_t dp = 0;
  bool no_digits_before_separator = false;
  if (('0' == *p) &&
      !(options &
        WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_MULTIPLE_LEADING_ZEROES)) {
    p++;
    for (;; p++) {
      if (p >= q) {
        goto after_all;
      } else if (*p ==
                 ((options &
                   WUFFS_BASE__PARSE_NUMBER_FXX__DECIMAL_SEPARATOR_IS_A_COMMA)
                      ? ','
                      : '.')) {
        p++;
        goto after_sep;
      } else if ((*p == 'E') || (*p == 'e')) {
        p++;
        goto after_exp;
      } else if ((*p != '_') ||
                 !(options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES)) {
        return wuffs_base__make_status(wuffs_base__error__bad_argument);
      }
    }

  } else if (('0' <= *p) && (*p <= '9')) {
    if (*p == '0') {
      for (; (p < q) && (*p == '0'); p++) {
      }
    } else {
      h->digits[nd++] = (uint8_t)(*p - '0');
      dp = (int32_t)nd;
      p++;
    }

    for (;; p++) {
      if (p >= q) {
        goto after_all;
      } else if (('0' <= *p) && (*p <= '9')) {
        if (nd < WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION) {
          h->digits[nd++] = (uint8_t)(*p - '0');
          dp = (int32_t)nd;
        } else if ('0' != *p) {
          // Long-tail non-zeroes set the truncated bit.
          h->truncated = true;
        }
      } else if (*p ==
                 ((options &
                   WUFFS_BASE__PARSE_NUMBER_FXX__DECIMAL_SEPARATOR_IS_A_COMMA)
                      ? ','
                      : '.')) {
        p++;
        goto after_sep;
      } else if ((*p == 'E') || (*p == 'e')) {
        p++;
        goto after_exp;
      } else if ((*p != '_') ||
                 !(options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES)) {
        return wuffs_base__make_status(wuffs_base__error__bad_argument);
      }
    }

  } else if (*p == ((options &
                     WUFFS_BASE__PARSE_NUMBER_FXX__DECIMAL_SEPARATOR_IS_A_COMMA)
                        ? ','
                        : '.')) {
    p++;
    no_digits_before_separator = true;

  } else {
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }

after_sep:
  for (;; p++) {
    if (p >= q) {
      goto after_all;
    } else if ('0' == *p) {
      if (nd == 0) {
        // Track leading zeroes implicitly.
        dp--;
      } else if (nd <
                 WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION) {
        h->digits[nd++] = (uint8_t)(*p - '0');
      }
    } else if (('0' < *p) && (*p <= '9')) {
      if (nd < WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION) {
        h->digits[nd++] = (uint8_t)(*p - '0');
      } else {
        // Long-tail non-zeroes set the truncated bit.
        h->truncated = true;
      }
    } else if ((*p == 'E') || (*p == 'e')) {
      p++;
      goto after_exp;
    } else if ((*p != '_') ||
               !(options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES)) {
      return wuffs_base__make_status(wuffs_base__error__bad_argument);
    }
  }

after_exp:
  do {
    if (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES) {
      for (;; p++) {
        if (p >= q) {
          return wuffs_base__make_status(wuffs_base__error__bad_argument);
        } else if (*p != '_') {
          break;
        }
      }
    }

    int32_t exp_sign = +1;
    if (*p == '+') {
      p++;
    } else if (*p == '-') {
      exp_sign = -1;
      p++;
    }

    int32_t exp = 0;
    const int32_t exp_large =
        WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE +
        WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION;
    bool saw_exp_digits = false;
    for (; p < q; p++) {
      if ((*p == '_') &&
          (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES)) {
        // No-op.
      } else if (('0' <= *p) && (*p <= '9')) {
        saw_exp_digits = true;
        if (exp < exp_large) {
          exp = (10 * exp) + ((int32_t)(*p - '0'));
        }
      } else {
        break;
      }
    }
    if (!saw_exp_digits) {
      return wuffs_base__make_status(wuffs_base__error__bad_argument);
    }
    dp += exp_sign * exp;
  } while (0);

after_all:
  if (p != q) {
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  h->num_digits = nd;
  if (nd == 0) {
    if (no_digits_before_separator) {
      return wuffs_base__make_status(wuffs_base__error__bad_argument);
    }
    h->decimal_point = 0;
  } else if (dp <
             -WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE) {
    h->decimal_point =
        -WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE - 1;
  } else if (dp >
             +WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE) {
    h->decimal_point =
        +WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE + 1;
  } else {
    h->decimal_point = dp;
  }
  wuffs_base__private_implementation__high_prec_dec__trim(h);
  return wuffs_base__make_status(NULL);
}

// --------

// wuffs_base__private_implementation__high_prec_dec__lshift_num_new_digits
// returns the number of additional decimal digits when left-shifting by shift.
//
// See below for preconditions.
static uint32_t  //
wuffs_base__private_implementation__high_prec_dec__lshift_num_new_digits(
    wuffs_base__private_implementation__high_prec_dec* h,
    uint32_t shift) {
  // Masking with 0x3F should be unnecessary (assuming the preconditions) but
  // it's cheap and ensures that we don't overflow the
  // wuffs_base__private_implementation__hpd_left_shift array.
  shift &= 63;

  uint32_t x_a = wuffs_base__private_implementation__hpd_left_shift[shift];
  uint32_t x_b = wuffs_base__private_implementation__hpd_left_shift[shift + 1];
  uint32_t num_new_digits = x_a >> 11;
  uint32_t pow5_a = 0x7FF & x_a;
  uint32_t pow5_b = 0x7FF & x_b;

  const uint8_t* pow5 =
      &wuffs_base__private_implementation__powers_of_5[pow5_a];
  uint32_t i = 0;
  uint32_t n = pow5_b - pow5_a;
  for (; i < n; i++) {
    if (i >= h->num_digits) {
      return num_new_digits - 1;
    } else if (h->digits[i] == pow5[i]) {
      continue;
    } else if (h->digits[i] < pow5[i]) {
      return num_new_digits - 1;
    } else {
      return num_new_digits;
    }
  }
  return num_new_digits;
}

// --------

// wuffs_base__private_implementation__high_prec_dec__rounded_integer returns
// the integral (non-fractional) part of h, provided that it is 18 or fewer
// decimal digits. For 19 or more digits, it returns UINT64_MAX. Note that:
//   - (1 << 53) is    9007199254740992, which has 16 decimal digits.
//   - (1 << 56) is   72057594037927936, which has 17 decimal digits.
//   - (1 << 59) is  576460752303423488, which has 18 decimal digits.
//   - (1 << 63) is 9223372036854775808, which has 19 decimal digits.
// and that IEEE 754 double precision has 52 mantissa bits.
//
// That integral part is rounded-to-even: rounding 7.5 or 8.5 both give 8.
//
// h's negative bit is ignored: rounding -8.6 returns 9.
//
// See below for preconditions.
static uint64_t  //
wuffs_base__private_implementation__high_prec_dec__rounded_integer(
    wuffs_base__private_implementation__high_prec_dec* h) {
  if ((h->num_digits == 0) || (h->decimal_point < 0)) {
    return 0;
  } else if (h->decimal_point > 18) {
    return UINT64_MAX;
  }

  uint32_t dp = (uint32_t)(h->decimal_point);
  uint64_t n = 0;
  uint32_t i = 0;
  for (; i < dp; i++) {
    n = (10 * n) + ((i < h->num_digits) ? h->digits[i] : 0);
  }

  bool round_up = false;
  if (dp < h->num_digits) {
    round_up = h->digits[dp] >= 5;
    if ((h->digits[dp] == 5) && (dp + 1 == h->num_digits)) {
      // We are exactly halfway. If we're truncated, round up, otherwise round
      // to even.
      round_up = h->truncated ||  //
                 ((dp > 0) && (1 & h->digits[dp - 1]));
    }
  }
  if (round_up) {
    n++;
  }

  return n;
}

// wuffs_base__private_implementation__high_prec_dec__small_xshift shifts h's
// number (where 'x' is 'l' or 'r' for left or right) by a small shift value.
//
// Preconditions:
//  - h is non-NULL.
//  - h->decimal_point is "not extreme".
//  - shift is non-zero.
//  - shift is "a small shift".
//
// "Not extreme" means within
// ±WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE.
//
// "A small shift" means not more than
// WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL.
//
// wuffs_base__private_implementation__high_prec_dec__rounded_integer and
// wuffs_base__private_implementation__high_prec_dec__lshift_num_new_digits
// have the same preconditions.
//
// wuffs_base__private_implementation__high_prec_dec__lshift keeps the first
// two preconditions but not the last two. Its shift argument is signed and
// does not need to be "small": zero is a no-op, positive means left shift and
// negative means right shift.

static void  //
wuffs_base__private_implementation__high_prec_dec__small_lshift(
    wuffs_base__private_implementation__high_prec_dec* h,
    uint32_t shift) {
  if (h->num_digits == 0) {
    return;
  }
  uint32_t num_new_digits =
      wuffs_base__private_implementation__high_prec_dec__lshift_num_new_digits(
          h, shift);
  uint32_t rx = h->num_digits - 1;                   // Read  index.
  uint32_t wx = h->num_digits - 1 + num_new_digits;  // Write index.
  uint64_t n = 0;

  // Repeat: pick up a digit, put down a digit, right to left.
  while (((int32_t)rx) >= 0) {
    n += ((uint64_t)(h->digits[rx])) << shift;
    uint64_t quo = n / 10;
    uint64_t rem = n - (10 * quo);
    if (wx < WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION) {
      h->digits[wx] = (uint8_t)rem;
    } else if (rem > 0) {
      h->truncated = true;
    }
    n = quo;
    wx--;
    rx--;
  }

  // Put down leading digits, right to left.
  while (n > 0) {
    uint64_t quo = n / 10;
    uint64_t rem = n - (10 * quo);
    if (wx < WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION) {
      h->digits[wx] = (uint8_t)rem;
    } else if (rem > 0) {
      h->truncated = true;
    }
    n = quo;
    wx--;
  }

  // Finish.
  h->num_digits += num_new_digits;
  if (h->num_digits >
      WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION) {
    h->num_digits = WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION;
  }
  h->decimal_point += (int32_t)num_new_digits;
  wuffs_base__private_implementation__high_prec_dec__trim(h);
}

static void  //
wuffs_base__private_implementation__high_prec_dec__small_rshift(
    wuffs_base__private_implementation__high_prec_dec* h,
    uint32_t shift) {
  uint32_t rx = 0;  // Read  index.
  uint32_t wx = 0;  // Write index.
  uint64_t n = 0;

  // Pick up enough leading digits to cover the first shift.
  while ((n >> shift) == 0) {
    if (rx < h->num_digits) {
      // Read a digit.
      n = (10 * n) + h->digits[rx++];
    } else if (n == 0) {
      // h's number used to be zero and remains zero.
      return;
    } else {
      // Read sufficient implicit trailing zeroes.
      while ((n >> shift) == 0) {
        n = 10 * n;
        rx++;
      }
      break;
    }
  }
  h->decimal_point -= ((int32_t)(rx - 1));
  if (h->decimal_point <
      -WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE) {
    // After the shift, h's number is effectively zero.
    h->num_digits = 0;
    h->decimal_point = 0;
    h->truncated = false;
    return;
  }

  // Repeat: pick up a digit, put down a digit, left to right.
  uint64_t mask = (((uint64_t)(1)) << shift) - 1;
  while (rx < h->num_digits) {
    uint8_t new_digit = ((uint8_t)(n >> shift));
    n = (10 * (n & mask)) + h->digits[rx++];
    h->digits[wx++] = new_digit;
  }

  // Put down trailing digits, left to right.
  while (n > 0) {
    uint8_t new_digit = ((uint8_t)(n >> shift));
    n = 10 * (n & mask);
    if (wx < WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION) {
      h->digits[wx++] = new_digit;
    } else if (new_digit > 0) {
      h->truncated = true;
    }
  }

  // Finish.
  h->num_digits = wx;
  wuffs_base__private_implementation__high_prec_dec__trim(h);
}

static void  //
wuffs_base__private_implementation__high_prec_dec__lshift(
    wuffs_base__private_implementation__high_prec_dec* h,
    int32_t shift) {
  if (shift > 0) {
    while (shift > +WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL) {
      wuffs_base__private_implementation__high_prec_dec__small_lshift(
          h, WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL);
      shift -= WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL;
    }
    wuffs_base__private_implementation__high_prec_dec__small_lshift(
        h, ((uint32_t)(+shift)));
  } else if (shift < 0) {
    while (shift < -WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL) {
      wuffs_base__private_implementation__high_prec_dec__small_rshift(
          h, WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL);
      shift += WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL;
    }
    wuffs_base__private_implementation__high_prec_dec__small_rshift(
        h, ((uint32_t)(-shift)));
  }
}

// --------

// wuffs_base__private_implementation__high_prec_dec__round_etc rounds h's
// number. For those functions that take an n argument, rounding produces at
// most n digits (which is not necessarily at most n decimal places). Negative
// n values are ignored, as well as any n greater than or equal to h's number
// of digits. The etc__round_just_enough function implicitly chooses an n to
// implement WUFFS_BASE__RENDER_NUMBER_FXX__JUST_ENOUGH_PRECISION.
//
// Preconditions:
//  - h is non-NULL.
//  - h->decimal_point is "not extreme".
//
// "Not extreme" means within
// ±WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE.

static void  //
wuffs_base__private_implementation__high_prec_dec__round_down(
    wuffs_base__private_implementation__high_prec_dec* h,
    int32_t n) {
  if ((n < 0) || (h->num_digits <= (uint32_t)n)) {
    return;
  }
  h->num_digits = (uint32_t)(n);
  wuffs_base__private_implementation__high_prec_dec__trim(h);
}

static void  //
wuffs_base__private_implementation__high_prec_dec__round_up(
    wuffs_base__private_implementation__high_prec_dec* h,
    int32_t n) {
  if ((n < 0) || (h->num_digits <= (uint32_t)n)) {
    return;
  }

  for (n--; n >= 0; n--) {
    if (h->digits[n] < 9) {
      h->digits[n]++;
      h->num_digits = (uint32_t)(n + 1);
      return;
    }
  }

  // The number is all 9s. Change to a single 1 and adjust the decimal point.
  h->digits[0] = 1;
  h->num_digits = 1;
  h->decimal_point++;
}

static void  //
wuffs_base__private_implementation__high_prec_dec__round_nearest(
    wuffs_base__private_implementation__high_prec_dec* h,
    int32_t n) {
  if ((n < 0) || (h->num_digits <= (uint32_t)n)) {
    return;
  }
  bool up = h->digits[n] >= 5;
  if ((h->digits[n] == 5) && ((n + 1) == ((int32_t)(h->num_digits)))) {
    up = h->truncated ||  //
         ((n > 0) && ((h->digits[n - 1] & 1) != 0));
  }

  if (up) {
    wuffs_base__private_implementation__high_prec_dec__round_up(h, n);
  } else {
    wuffs_base__private_implementation__high_prec_dec__round_down(h, n);
  }
}

static void  //
wuffs_base__private_implementation__high_prec_dec__round_just_enough(
    wuffs_base__private_implementation__high_prec_dec* h,
    int32_t exp2,
    uint64_t mantissa) {
  // The magic numbers 52 and 53 in this function are because IEEE 754 double
  // precision has 52 mantissa bits.
  //
  // Let f be the floating point number represented by exp2 and mantissa (and
  // also the number in h): the number (mantissa * (2 ** (exp2 - 52))).
  //
  // If f is zero or a small integer, we can return early.
  if ((mantissa == 0) ||
      ((exp2 < 53) && (h->decimal_point >= ((int32_t)(h->num_digits))))) {
    return;
  }

  // The smallest normal f has an exp2 of -1022 and a mantissa of (1 << 52).
  // Subnormal numbers have the same exp2 but a smaller mantissa.
  static const int32_t min_incl_normal_exp2 = -1022;
  static const uint64_t min_incl_normal_mantissa = 0x0010000000000000ul;

  // Compute lower and upper bounds such that any number between them (possibly
  // inclusive) will round to f. First, the lower bound. Our number f is:
  //   ((mantissa + 0)         * (2 ** (  exp2 - 52)))
  //
  // The next lowest floating point number is:
  //   ((mantissa - 1)         * (2 ** (  exp2 - 52)))
  // unless (mantissa - 1) drops the (1 << 52) bit and exp2 is not the
  // min_incl_normal_exp2. Either way, call it:
  //   ((l_mantissa)           * (2 ** (l_exp2 - 52)))
  //
  // The lower bound is halfway between them (noting that 52 became 53):
  //   (((2 * l_mantissa) + 1) * (2 ** (l_exp2 - 53)))
  int32_t l_exp2 = exp2;
  uint64_t l_mantissa = mantissa - 1;
  if ((exp2 > min_incl_normal_exp2) && (mantissa <= min_incl_normal_mantissa)) {
    l_exp2 = exp2 - 1;
    l_mantissa = (2 * mantissa) - 1;
  }
  wuffs_base__private_implementation__high_prec_dec lower;
  wuffs_base__private_implementation__high_prec_dec__assign(
      &lower, (2 * l_mantissa) + 1, false);
  wuffs_base__private_implementation__high_prec_dec__lshift(&lower,
                                                            l_exp2 - 53);

  // Next, the upper bound. Our number f is:
  //   ((mantissa + 0)       * (2 ** (exp2 - 52)))
  //
  // The next highest floating point number is:
  //   ((mantissa + 1)       * (2 ** (exp2 - 52)))
  //
  // The upper bound is halfway between them (noting that 52 became 53):
  //   (((2 * mantissa) + 1) * (2 ** (exp2 - 53)))
  wuffs_base__private_implementation__high_prec_dec upper;
  wuffs_base__private_implementation__high_prec_dec__assign(
      &upper, (2 * mantissa) + 1, false);
  wuffs_base__private_implementation__high_prec_dec__lshift(&upper, exp2 - 53);

  // The lower and upper bounds are possible outputs only if the original
  // mantissa is even, so that IEEE round-to-even would round to the original
  // mantissa and not its neighbors.
  bool inclusive = (mantissa & 1) == 0;

  // As we walk the digits, we want to know whether rounding up would fall
  // within the upper bound. This is tracked by upper_delta:
  //  - When -1, the digits of h and upper are the same so far.
  //  - When +0, we saw a difference of 1 between h and upper on a previous
  //    digit and subsequently only 9s for h and 0s for upper. Thus, rounding
  //    up may fall outside of the bound if !inclusive.
  //  - When +1, the difference is greater than 1 and we know that rounding up
  //    falls within the bound.
  //
  // This is a state machine with three states. The numerical value for each
  // state (-1, +0 or +1) isn't important, other than their order.
  int upper_delta = -1;

  // We can now figure out the shortest number of digits required. Walk the
  // digits until h has distinguished itself from lower or upper.
  //
  // The zi and zd variables are indexes and digits, for z in l (lower), h (the
  // number) and u (upper).
  //
  // The lower, h and upper numbers may have their decimal points at different
  // places. In this case, upper is the longest, so we iterate ui starting from
  // 0 and iterate li and hi starting from either 0 or -1.
  int32_t ui = 0;
  for (;; ui++) {
    // Calculate hd, the middle number's digit.
    int32_t hi = ui - upper.decimal_point + h->decimal_point;
    if (hi >= ((int32_t)(h->num_digits))) {
      break;
    }
    uint8_t hd = (((uint32_t)hi) < h->num_digits) ? h->digits[hi] : 0;

    // Calculate ld, the lower bound's digit.
    int32_t li = ui - upper.decimal_point + lower.decimal_point;
    uint8_t ld = (((uint32_t)li) < lower.num_digits) ? lower.digits[li] : 0;

    // We can round down (truncate) if lower has a different digit than h or if
    // lower is inclusive and is exactly the result of rounding down (i.e. we
    // have reached the final digit of lower).
    bool can_round_down =
        (ld != hd) ||  //
        (inclusive && ((li + 1) == ((int32_t)(lower.num_digits))));

    // Calculate ud, the upper bound's digit, and update upper_delta.
    uint8_t ud = (((uint32_t)ui) < upper.num_digits) ? upper.digits[ui] : 0;
    if (upper_delta < 0) {
      if ((hd + 1) < ud) {
        // For example:
        // h     = 12345???
        // upper = 12347???
        upper_delta = +1;
      } else if (hd != ud) {
        // For example:
        // h     = 12345???
        // upper = 12346???
        upper_delta = +0;
      }
    } else if (upper_delta == 0) {
      if ((hd != 9) || (ud != 0)) {
        // For example:
        // h     = 1234598?
        // upper = 1234600?
        upper_delta = +1;
      }
    }

    // We can round up if upper has a different digit than h and either upper
    // is inclusive or upper is bigger than the result of rounding up.
    bool can_round_up =
        (upper_delta > 0) ||    //
        ((upper_delta == 0) &&  //
         (inclusive || ((ui + 1) < ((int32_t)(upper.num_digits)))));

    // If we can round either way, round to nearest. If we can round only one
    // way, do it. If we can't round, continue the loop.
    if (can_round_down) {
      if (can_round_up) {
        wuffs_base__private_implementation__high_prec_dec__round_nearest(
            h, hi + 1);
        return;
      } else {
        wuffs_base__private_implementation__high_prec_dec__round_down(h,
                                                                      hi + 1);
        return;
      }
    } else {
      if (can_round_up) {
        wuffs_base__private_implementation__high_prec_dec__round_up(h, hi + 1);
        return;
      }
    }
  }
}

// --------

// wuffs_base__private_implementation__parse_number_f64_eisel_lemire produces
// the IEEE 754 double-precision value for an exact mantissa and base-10
// exponent. For example:
//  - when parsing "12345.678e+02", man is 12345678 and exp10 is -1.
//  - when parsing "-12", man is 12 and exp10 is 0. Processing the leading
//    minus sign is the responsibility of the caller, not this function.
//
// On success, it returns a non-negative int64_t such that the low 63 bits hold
// the 11-bit exponent and 52-bit mantissa.
//
// On failure, it returns a negative value.
//
// The algorithm is based on an original idea by Michael Eisel that was refined
// by Daniel Lemire. See
// https://lemire.me/blog/2020/03/10/fast-float-parsing-in-practice/
// and
// https://nigeltao.github.io/blog/2020/eisel-lemire.html
//
// Preconditions:
//  - man is non-zero.
//  - exp10 is in the range [-307 ..= 288], the same range of the
//    wuffs_base__private_implementation__powers_of_10 array.
//
// The exp10 range (and the fact that man is in the range [1 ..= UINT64_MAX],
// approximately [1 ..= 1.85e+19]) means that (man * (10 ** exp10)) is in the
// range [1e-307 ..= 1.85e+307]. This is entirely within the range of normal
// (neither subnormal nor non-finite) f64 values: DBL_MIN and DBL_MAX are
// approximately 2.23e–308 and 1.80e+308.
static int64_t  //
wuffs_base__private_implementation__parse_number_f64_eisel_lemire(
    uint64_t man,
    int32_t exp10) {
  // Look up the (possibly truncated) base-2 representation of (10 ** exp10).
  // The look-up table was constructed so that it is already normalized: the
  // table entry's mantissa's MSB (most significant bit) is on.
  const uint64_t* po10 =
      &wuffs_base__private_implementation__powers_of_10[exp10 + 307][0];

  // Normalize the man argument. The (man != 0) precondition means that a
  // non-zero bit exists.
  uint32_t clz = wuffs_base__count_leading_zeroes_u64(man);
  man <<= clz;

  // Calculate the return value's base-2 exponent. We might tweak it by ±1
  // later, but its initial value comes from a linear scaling of exp10,
  // converting from power-of-10 to power-of-2, and adjusting by clz.
  //
  // The magic constants are:
  //  - 1087 = 1023 + 64. The 1023 is the f64 exponent bias. The 64 is because
  //    the look-up table uses 64-bit mantissas.
  //  - 217706 is such that the ratio 217706 / 65536 ≈ 3.321930 is close enough
  //    (over the practical range of exp10) to log(10) / log(2) ≈ 3.321928.
  //  - 65536 = 1<<16 is arbitrary but a power of 2, so division is a shift.
  //
  // Equality of the linearly-scaled value and the actual power-of-2, over the
  // range of exp10 arguments that this function accepts, is confirmed by
  // script/print-mpb-powers-of-10.go
  uint64_t ret_exp2 =
      ((uint64_t)(((217706 * exp10) >> 16) + 1087)) - ((uint64_t)clz);

  // Multiply the two mantissas. Normalization means that both mantissas are at
  // least (1<<63), so the 128-bit product must be at least (1<<126). The high
  // 64 bits of the product, x_hi, must therefore be at least (1<<62).
  //
  // As a consequence, x_hi has either 0 or 1 leading zeroes. Shifting x_hi
  // right by either 9 or 10 bits (depending on x_hi's MSB) will therefore
  // leave the top 10 MSBs (bits 54 ..= 63) off and the 11th MSB (bit 53) on.
  wuffs_base__multiply_u64__output x = wuffs_base__multiply_u64(man, po10[1]);
  uint64_t x_hi = x.hi;
  uint64_t x_lo = x.lo;

  // Before we shift right by at least 9 bits, recall that the look-up table
  // entry was possibly truncated. We have so far only calculated a lower bound
  // for the product (man * e), where e is (10 ** exp10). The upper bound would
  // add a further (man * 1) to the 128-bit product, which overflows the lower
  // 64-bit limb if ((x_lo + man) < man).
  //
  // If overflow occurs, that adds 1 to x_hi. Since we're about to shift right
  // by at least 9 bits, that carried 1 can be ignored unless the higher 64-bit
  // limb's low 9 bits are all on.
  //
  // For example, parsing "9999999999999999999" will take the if-true branch
  // here, since:
  //  - x_hi = 0x4563918244F3FFFF
  //  - x_lo = 0x8000000000000000
  //  - man  = 0x8AC7230489E7FFFF
  if (((x_hi & 0x1FF) == 0x1FF) && ((x_lo + man) < man)) {
    // Refine our calculation of (man * e). Before, our approximation of e used
    // a "low resolution" 64-bit mantissa. Now use a "high resolution" 128-bit
    // mantissa. We've already calculated x = (man * bits_0_to_63_incl_of_e).
    // Now calculate y = (man * bits_64_to_127_incl_of_e).
    wuffs_base__multiply_u64__output y = wuffs_base__multiply_u64(man, po10[0]);
    uint64_t y_hi = y.hi;
    uint64_t y_lo = y.lo;

    // Merge the 128-bit x and 128-bit y, which overlap by 64 bits, to
    // calculate the 192-bit product of the 64-bit man by the 128-bit e.
    // As we exit this if-block, we only care about the high 128 bits
    // (merged_hi and merged_lo) of that 192-bit product.
    //
    // For example, parsing "1.234e-45" will take the if-true branch here,
    // since:
    //  - x_hi = 0x70B7E3696DB29FFF
    //  - x_lo = 0xE040000000000000
    //  - y_hi = 0x33718BBEAB0E0D7A
    //  - y_lo = 0xA880000000000000
    uint64_t merged_hi = x_hi;
    uint64_t merged_lo = x_lo + y_hi;
    if (merged_lo < x_lo) {
      merged_hi++;  // Carry the overflow bit.
    }

    // The "high resolution" approximation of e is still a lower bound. Once
    // again, see if the upper bound is large enough to produce a different
    // result. This time, if it does, give up instead of reaching for an even
    // more precise approximation to e.
    //
    // This three-part check is similar to the two-part check that guarded the
    // if block that we're now in, but it has an extra term for the middle 64
    // bits (checking that adding 1 to merged_lo would overflow).
    //
    // For example, parsing "5.9604644775390625e-8" will take the if-true
    // branch here, since:
    //  - merged_hi = 0x7FFFFFFFFFFFFFFF
    //  - merged_lo = 0xFFFFFFFFFFFFFFFF
    //  - y_lo      = 0x4DB3FFC120988200
    //  - man       = 0xD3C21BCECCEDA100
    if (((merged_hi & 0x1FF) == 0x1FF) && ((merged_lo + 1) == 0) &&
        (y_lo + man < man)) {
      return -1;
    }

    // Replace the 128-bit x with merged.
    x_hi = merged_hi;
    x_lo = merged_lo;
  }

  // As mentioned above, shifting x_hi right by either 9 or 10 bits will leave
  // the top 10 MSBs (bits 54 ..= 63) off and the 11th MSB (bit 53) on. If the
  // MSB (before shifting) was on, adjust ret_exp2 for the larger shift.
  //
  // Having bit 53 on (and higher bits off) means that ret_mantissa is a 54-bit
  // number.
  uint64_t msb = x_hi >> 63;
  uint64_t ret_mantissa = x_hi >> (msb + 9);
  ret_exp2 -= 1 ^ msb;

  // IEEE 754 rounds to-nearest with ties rounded to-even. Rounding to-even can
  // be tricky. If we're half-way between two exactly representable numbers
  // (x's low 73 bits are zero and the next 2 bits that matter are "01"), give
  // up instead of trying to pick the winner.
  //
  // Technically, we could tighten the condition by changing "73" to "73 or 74,
  // depending on msb", but a flat "73" is simpler.
  //
  // For example, parsing "1e+23" will take the if-true branch here, since:
  //  - x_hi          = 0x54B40B1F852BDA00
  //  - ret_mantissa  = 0x002A5A058FC295ED
  if ((x_lo == 0) && ((x_hi & 0x1FF) == 0) && ((ret_mantissa & 3) == 1)) {
    return -1;
  }

  // If we're not halfway then it's rounding to-nearest. Starting with a 54-bit
  // number, carry the lowest bit (bit 0) up if it's on. Regardless of whether
  // it was on or off, shifting right by one then produces a 53-bit number. If
  // carrying up overflowed, shift again.
  ret_mantissa += ret_mantissa & 1;
  ret_mantissa >>= 1;
  // This if block is equivalent to (but benchmarks slightly faster than) the
  // following branchless form:
  //    uint64_t overflow_adjustment = ret_mantissa >> 53;
  //    ret_mantissa >>= overflow_adjustment;
  //    ret_exp2 += overflow_adjustment;
  //
  // For example, parsing "7.2057594037927933e+16" will take the if-true
  // branch here, since:
  //  - x_hi          = 0x7FFFFFFFFFFFFE80
  //  - ret_mantissa  = 0x0020000000000000
  if ((ret_mantissa >> 53) > 0) {
    ret_mantissa >>= 1;
    ret_exp2++;
  }

  // Starting with a 53-bit number, IEEE 754 double-precision normal numbers
  // have an implicit mantissa bit. Mask that away and keep the low 52 bits.
  ret_mantissa &= 0x000FFFFFFFFFFFFF;

  // Pack the bits and return.
  return ((int64_t)(ret_mantissa | (ret_exp2 << 52)));
}

// --------

static wuffs_base__result_f64  //
wuffs_base__private_implementation__parse_number_f64_special(
    wuffs_base__slice_u8 s,
    uint32_t options) {
  do {
    if (options & WUFFS_BASE__PARSE_NUMBER_FXX__REJECT_INF_AND_NAN) {
      goto fail;
    }

    uint8_t* p = s.ptr;
    uint8_t* q = s.ptr + s.len;

    for (; (p < q) && (*p == '_'); p++) {
    }
    if (p >= q) {
      goto fail;
    }

    // Parse sign.
    bool negative = false;
    do {
      if (*p == '+') {
        p++;
      } else if (*p == '-') {
        negative = true;
        p++;
      } else {
        break;
      }
      for (; (p < q) && (*p == '_'); p++) {
      }
    } while (0);
    if (p >= q) {
      goto fail;
    }

    bool nan = false;
    switch (p[0]) {
      case 'I':
      case 'i':
        if (((q - p) < 3) ||                     //
            ((p[1] != 'N') && (p[1] != 'n')) ||  //
            ((p[2] != 'F') && (p[2] != 'f'))) {
          goto fail;
        }
        p += 3;

        if ((p >= q) || (*p == '_')) {
          break;
        } else if (((q - p) < 5) ||                     //
                   ((p[0] != 'I') && (p[0] != 'i')) ||  //
                   ((p[1] != 'N') && (p[1] != 'n')) ||  //
                   ((p[2] != 'I') && (p[2] != 'i')) ||  //
                   ((p[3] != 'T') && (p[3] != 't')) ||  //
                   ((p[4] != 'Y') && (p[4] != 'y'))) {
          goto fail;
        }
        p += 5;

        if ((p >= q) || (*p == '_')) {
          break;
        }
        goto fail;

      case 'N':
      case 'n':
        if (((q - p) < 3) ||                     //
            ((p[1] != 'A') && (p[1] != 'a')) ||  //
            ((p[2] != 'N') && (p[2] != 'n'))) {
          goto fail;
        }
        p += 3;

        if ((p >= q) || (*p == '_')) {
          nan = true;
          break;
        }
        goto fail;

      default:
        goto fail;
    }

    // Finish.
    for (; (p < q) && (*p == '_'); p++) {
    }
    if (p != q) {
      goto fail;
    }
    wuffs_base__result_f64 ret;
    ret.status.repr = NULL;
    ret.value = wuffs_base__ieee_754_bit_representation__from_u64_to_f64(
        (nan ? 0x7FFFFFFFFFFFFFFF : 0x7FF0000000000000) |
        (negative ? 0x8000000000000000 : 0));
    return ret;
  } while (0);

fail:
  do {
    wuffs_base__result_f64 ret;
    ret.status.repr = wuffs_base__error__bad_argument;
    ret.value = 0;
    return ret;
  } while (0);
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__result_f64  //
wuffs_base__private_implementation__high_prec_dec__to_f64(
    wuffs_base__private_implementation__high_prec_dec* h,
    uint32_t options) {
  do {
    // powers converts decimal powers of 10 to binary powers of 2. For example,
    // (10000 >> 13) is 1. It stops before the elements exceed 60, also known
    // as WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL.
    static const uint32_t num_powers = 19;
    static const uint8_t powers[19] = {
        0,  3,  6,  9,  13, 16, 19, 23, 26, 29,  //
        33, 36, 39, 43, 46, 49, 53, 56, 59,      //
    };

    // Handle zero and obvious extremes. The largest and smallest positive
    // finite f64 values are approximately 1.8e+308 and 4.9e-324.
    if ((h->num_digits == 0) || (h->decimal_point < -326)) {
      goto zero;
    } else if (h->decimal_point > 310) {
      goto infinity;
    }

    // Try the fast Eisel-Lemire algorithm again. Calculating the (man, exp10)
    // pair from the high_prec_dec h is more correct but slower than the
    // approach taken in wuffs_base__parse_number_f64. The latter is optimized
    // for the common cases (e.g. assuming no underscores or a leading '+'
    // sign) rather than the full set of cases allowed by the Wuffs API.
    if (h->num_digits <= 19) {
      uint64_t man = 0;
      uint32_t i;
      for (i = 0; i < h->num_digits; i++) {
        man = (10 * man) + h->digits[i];
      }
      int32_t exp10 = h->decimal_point - ((int32_t)(h->num_digits));
      if ((man != 0) && (-307 <= exp10) && (exp10 <= 288)) {
        int64_t r =
            wuffs_base__private_implementation__parse_number_f64_eisel_lemire(
                man, exp10);
        if (r >= 0) {
          wuffs_base__result_f64 ret;
          ret.status.repr = NULL;
          ret.value = wuffs_base__ieee_754_bit_representation__from_u64_to_f64(
              ((uint64_t)r) | (((uint64_t)(h->negative)) << 63));
          return ret;
        }
      }
    }

    // When Eisel-Lemire fails, fall back to Simple Decimal Conversion. See
    // https://nigeltao.github.io/blog/2020/parse-number-f64-simple.html
    //
    // Scale by powers of 2 until we're in the range [½ .. 1], which gives us
    // our exponent (in base-2). First we shift right, possibly a little too
    // far, ending with a value certainly below 1 and possibly below ½...
    const int32_t f64_bias = -1023;
    int32_t exp2 = 0;
    while (h->decimal_point > 0) {
      uint32_t n = (uint32_t)(+h->decimal_point);
      uint32_t shift =
          (n < num_powers)
              ? powers[n]
              : WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL;

      wuffs_base__private_implementation__high_prec_dec__small_rshift(h, shift);
      if (h->decimal_point <
          -WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE) {
        goto zero;
      }
      exp2 += (int32_t)shift;
    }
    // ...then we shift left, putting us in [½ .. 1].
    while (h->decimal_point <= 0) {
      uint32_t shift;
      if (h->decimal_point == 0) {
        if (h->digits[0] >= 5) {
          break;
        }
        shift = (h->digits[0] < 2) ? 2 : 1;
      } else {
        uint32_t n = (uint32_t)(-h->decimal_point);
        shift = (n < num_powers)
                    ? powers[n]
                    : WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL;
      }

      wuffs_base__private_implementation__high_prec_dec__small_lshift(h, shift);
      if (h->decimal_point >
          +WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE) {
        goto infinity;
      }
      exp2 -= (int32_t)shift;
    }

    // We're in the range [½ .. 1] but f64 uses [1 .. 2].
    exp2--;

    // The minimum normal exponent is (f64_bias + 1).
    while ((f64_bias + 1) > exp2) {
      uint32_t n = (uint32_t)((f64_bias + 1) - exp2);
      if (n > WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL) {
        n = WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL;
      }
      wuffs_base__private_implementation__high_prec_dec__small_rshift(h, n);
      exp2 += (int32_t)n;
    }

    // Check for overflow.
    if ((exp2 - f64_bias) >= 0x07FF) {  // (1 << 11) - 1.
      goto infinity;
    }

    // Extract 53 bits for the mantissa (in base-2).
    wuffs_base__private_implementation__high_prec_dec__small_lshift(h, 53);
    uint64_t man2 =
        wuffs_base__private_implementation__high_prec_dec__rounded_integer(h);

    // Rounding might have added one bit. If so, shift and re-check overflow.
    if ((man2 >> 53) != 0) {
      man2 >>= 1;
      exp2++;
      if ((exp2 - f64_bias) >= 0x07FF) {  // (1 << 11) - 1.
        goto infinity;
      }
    }

    // Handle subnormal numbers.
    if ((man2 >> 52) == 0) {
      exp2 = f64_bias;
    }

    // Pack the bits and return.
    uint64_t exp2_bits =
        (uint64_t)((exp2 - f64_bias) & 0x07FF);              // (1 << 11) - 1.
    uint64_t bits = (man2 & 0x000FFFFFFFFFFFFF) |            // (1 << 52) - 1.
                    (exp2_bits << 52) |                      //
                    (h->negative ? 0x8000000000000000 : 0);  // (1 << 63).

    wuffs_base__result_f64 ret;
    ret.status.repr = NULL;
    ret.value = wuffs_base__ieee_754_bit_representation__from_u64_to_f64(bits);
    return ret;
  } while (0);

zero:
  do {
    uint64_t bits = h->negative ? 0x8000000000000000 : 0;

    wuffs_base__result_f64 ret;
    ret.status.repr = NULL;
    ret.value = wuffs_base__ieee_754_bit_representation__from_u64_to_f64(bits);
    return ret;
  } while (0);

infinity:
  do {
    if (options & WUFFS_BASE__PARSE_NUMBER_FXX__REJECT_INF_AND_NAN) {
      wuffs_base__result_f64 ret;
      ret.status.repr = wuffs_base__error__bad_argument;
      ret.value = 0;
      return ret;
    }

    uint64_t bits = h->negative ? 0xFFF0000000000000 : 0x7FF0000000000000;

    wuffs_base__result_f64 ret;
    ret.status.repr = NULL;
    ret.value = wuffs_base__ieee_754_bit_representation__from_u64_to_f64(bits);
    return ret;
  } while (0);
}

static inline bool  //
wuffs_base__private_implementation__is_decimal_digit(uint8_t c) {
  return ('0' <= c) && (c <= '9');
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__result_f64  //
wuffs_base__parse_number_f64(wuffs_base__slice_u8 s, uint32_t options) {
  // In practice, almost all "dd.ddddE±xxx" numbers can be represented
  // losslessly by a uint64_t mantissa "dddddd" and an int32_t base-10
  // exponent, adjusting "xxx" for the position (if present) of the decimal
  // separator '.' or ','.
  //
  // This (u64 man, i32 exp10) data structure is superficially similar to the
  // "Do It Yourself Floating Point" type from Loitsch (†), but the exponent
  // here is base-10, not base-2.
  //
  // If s's number fits in a (man, exp10), parse that pair with the
  // Eisel-Lemire algorithm. If not, or if Eisel-Lemire fails, parsing s with
  // the fallback algorithm is slower but comprehensive.
  //
  // † "Printing Floating-Point Numbers Quickly and Accurately with Integers"
  // (https://www.cs.tufts.edu/~nr/cs257/archive/florian-loitsch/printf.pdf).
  // Florian Loitsch is also the primary contributor to
  // https://github.com/google/double-conversion
  do {
    // Calculating that (man, exp10) pair needs to stay within s's bounds.
    // Provided that s isn't extremely long, work on a NUL-terminated copy of
    // s's contents. The NUL byte isn't a valid part of "±dd.ddddE±xxx".
    //
    // As the pointer p walks the contents, it's faster to repeatedly check "is
    // *p a valid digit" than "is p within bounds and *p a valid digit".
    if (s.len >= 256) {
      goto fallback;
    }
    uint8_t z[256];
    memcpy(&z[0], s.ptr, s.len);
    z[s.len] = 0;
    const uint8_t* p = &z[0];

    // Look for a leading minus sign. Technically, we could also look for an
    // optional plus sign, but the "script/process-json-numbers.c with -p"
    // benchmark is noticably slower if we do. It's optional and, in practice,
    // usually absent. Let the fallback catch it.
    bool negative = (*p == '-');
    if (negative) {
      p++;
    }

    // After walking "dd.dddd", comparing p later with p now will produce the
    // number of "d"s and "."s.
    const uint8_t* const start_of_digits_ptr = p;

    // Walk the "d"s before a '.', 'E', NUL byte, etc. If it starts with '0',
    // it must be a single '0'. If it starts with a non-zero decimal digit, it
    // can be a sequence of decimal digits.
    //
    // Update the man variable during the walk. It's OK if man overflows now.
    // We'll detect that later.
    uint64_t man;
    if (*p == '0') {
      man = 0;
      p++;
      if (wuffs_base__private_implementation__is_decimal_digit(*p)) {
        goto fallback;
      }
    } else if (wuffs_base__private_implementation__is_decimal_digit(*p)) {
      man = ((uint8_t)(*p - '0'));
      p++;
      for (; wuffs_base__private_implementation__is_decimal_digit(*p); p++) {
        man = (10 * man) + ((uint8_t)(*p - '0'));
      }
    } else {
      goto fallback;
    }

    // Walk the "d"s after the optional decimal separator ('.' or ','),
    // updating the man and exp10 variables.
    int32_t exp10 = 0;
    if (*p ==
        ((options & WUFFS_BASE__PARSE_NUMBER_FXX__DECIMAL_SEPARATOR_IS_A_COMMA)
             ? ','
             : '.')) {
      p++;
      const uint8_t* first_after_separator_ptr = p;
      if (!wuffs_base__private_implementation__is_decimal_digit(*p)) {
        goto fallback;
      }
      man = (10 * man) + ((uint8_t)(*p - '0'));
      p++;
      for (; wuffs_base__private_implementation__is_decimal_digit(*p); p++) {
        man = (10 * man) + ((uint8_t)(*p - '0'));
      }
      exp10 = ((int32_t)(first_after_separator_ptr - p));
    }

    // Count the number of digits:
    //  - for an input of "314159",  digit_count is 6.
    //  - for an input of "3.14159", digit_count is 7.
    //
    // This is off-by-one if there is a decimal separator. That's OK for now.
    // We'll correct for that later. The "script/process-json-numbers.c with
    // -p" benchmark is noticably slower if we try to correct for that now.
    uint32_t digit_count = (uint32_t)(p - start_of_digits_ptr);

    // Update exp10 for the optional exponent, starting with 'E' or 'e'.
    if ((*p | 0x20) == 'e') {
      p++;
      int32_t exp_sign = +1;
      if (*p == '-') {
        p++;
        exp_sign = -1;
      } else if (*p == '+') {
        p++;
      }
      if (!wuffs_base__private_implementation__is_decimal_digit(*p)) {
        goto fallback;
      }
      int32_t exp_num = ((uint8_t)(*p - '0'));
      p++;
      // The rest of the exp_num walking has a peculiar control flow but, once
      // again, the "script/process-json-numbers.c with -p" benchmark is
      // sensitive to alternative formulations.
      if (wuffs_base__private_implementation__is_decimal_digit(*p)) {
        exp_num = (10 * exp_num) + ((uint8_t)(*p - '0'));
        p++;
      }
      if (wuffs_base__private_implementation__is_decimal_digit(*p)) {
        exp_num = (10 * exp_num) + ((uint8_t)(*p - '0'));
        p++;
      }
      while (wuffs_base__private_implementation__is_decimal_digit(*p)) {
        if (exp_num > 0x1000000) {
          goto fallback;
        }
        exp_num = (10 * exp_num) + ((uint8_t)(*p - '0'));
        p++;
      }
      exp10 += exp_sign * exp_num;
    }

    // The Wuffs API is that the original slice has no trailing data. It also
    // allows underscores, which we don't catch here but the fallback should.
    if (p != &z[s.len]) {
      goto fallback;
    }

    // Check that the uint64_t typed man variable has not overflowed, based on
    // digit_count.
    //
    // For reference:
    //   - (1 << 63) is  9223372036854775808, which has 19 decimal digits.
    //   - (1 << 64) is 18446744073709551616, which has 20 decimal digits.
    //   - 19 nines,  9999999999999999999, is  0x8AC7230489E7FFFF, which has 64
    //     bits and 16 hexadecimal digits.
    //   - 20 nines, 99999999999999999999, is 0x56BC75E2D630FFFFF, which has 67
    //     bits and 17 hexadecimal digits.
    if (digit_count > 19) {
      // Even if we have more than 19 pseudo-digits, it's not yet definitely an
      // overflow. Recall that digit_count might be off-by-one (too large) if
      // there's a decimal separator. It will also over-report the number of
      // meaningful digits if the input looks something like "0.000dddExxx".
      //
      // We adjust by the number of leading '0's and '.'s and re-compare to 19.
      // Once again, technically, we could skip ','s too, but that perturbs the
      // "script/process-json-numbers.c with -p" benchmark.
      const uint8_t* q = start_of_digits_ptr;
      for (; (*q == '0') || (*q == '.'); q++) {
      }
      digit_count -= (uint32_t)(q - start_of_digits_ptr);
      if (digit_count > 19) {
        goto fallback;
      }
    }

    // The wuffs_base__private_implementation__parse_number_f64_eisel_lemire
    // preconditions include that exp10 is in the range [-307 ..= 288].
    if ((exp10 < -307) || (288 < exp10)) {
      goto fallback;
    }

    // If both man and (10 ** exp10) are exactly representable by a double, we
    // don't need to run the Eisel-Lemire algorithm.
    if ((-22 <= exp10) && (exp10 <= 22) && ((man >> 53) == 0)) {
      double d = (double)man;
      if (exp10 >= 0) {
        d *= wuffs_base__private_implementation__f64_powers_of_10[+exp10];
      } else {
        d /= wuffs_base__private_implementation__f64_powers_of_10[-exp10];
      }
      wuffs_base__result_f64 ret;
      ret.status.repr = NULL;
      ret.value = negative ? -d : +d;
      return ret;
    }

    // The wuffs_base__private_implementation__parse_number_f64_eisel_lemire
    // preconditions include that man is non-zero. Parsing "0" should be caught
    // by the "If both man and (10 ** exp10)" above, but "0e99" might not.
    if (man == 0) {
      goto fallback;
    }

    // Our man and exp10 are in range. Run the Eisel-Lemire algorithm.
    int64_t r =
        wuffs_base__private_implementation__parse_number_f64_eisel_lemire(
            man, exp10);
    if (r < 0) {
      goto fallback;
    }
    wuffs_base__result_f64 ret;
    ret.status.repr = NULL;
    ret.value = wuffs_base__ieee_754_bit_representation__from_u64_to_f64(
        ((uint64_t)r) | (((uint64_t)negative) << 63));
    return ret;
  } while (0);

fallback:
  do {
    wuffs_base__private_implementation__high_prec_dec h;
    wuffs_base__status status =
        wuffs_base__private_implementation__high_prec_dec__parse(&h, s,
                                                                 options);
    if (status.repr) {
      return wuffs_base__private_implementation__parse_number_f64_special(
          s, options);
    }
    return wuffs_base__private_implementation__high_prec_dec__to_f64(&h,
                                                                     options);
  } while (0);
}

// --------

static inline size_t  //
wuffs_base__private_implementation__render_inf(wuffs_base__slice_u8 dst,
                                               bool neg,
                                               uint32_t options) {
  if (neg) {
    if (dst.len < 4) {
      return 0;
    }
    wuffs_base__poke_u32le__no_bounds_check(dst.ptr, 0x666E492D);  // '-Inf'le.
    return 4;
  }

  if (options & WUFFS_BASE__RENDER_NUMBER_XXX__LEADING_PLUS_SIGN) {
    if (dst.len < 4) {
      return 0;
    }
    wuffs_base__poke_u32le__no_bounds_check(dst.ptr, 0x666E492B);  // '+Inf'le.
    return 4;
  }

  if (dst.len < 3) {
    return 0;
  }
  wuffs_base__poke_u24le__no_bounds_check(dst.ptr, 0x666E49);  // 'Inf'le.
  return 3;
}

static inline size_t  //
wuffs_base__private_implementation__render_nan(wuffs_base__slice_u8 dst) {
  if (dst.len < 3) {
    return 0;
  }
  wuffs_base__poke_u24le__no_bounds_check(dst.ptr, 0x4E614E);  // 'NaN'le.
  return 3;
}

static size_t  //
wuffs_base__private_implementation__high_prec_dec__render_exponent_absent(
    wuffs_base__slice_u8 dst,
    wuffs_base__private_implementation__high_prec_dec* h,
    uint32_t precision,
    uint32_t options) {
  size_t n = (h->negative ||
              (options & WUFFS_BASE__RENDER_NUMBER_XXX__LEADING_PLUS_SIGN))
                 ? 1
                 : 0;
  if (h->decimal_point <= 0) {
    n += 1;
  } else {
    n += (size_t)(h->decimal_point);
  }
  if (precision > 0) {
    n += precision + 1;  // +1 for the '.'.
  }

  // Don't modify dst if the formatted number won't fit.
  if (n > dst.len) {
    return 0;
  }

  // Align-left or align-right.
  uint8_t* ptr = (options & WUFFS_BASE__RENDER_NUMBER_XXX__ALIGN_RIGHT)
                     ? &dst.ptr[dst.len - n]
                     : &dst.ptr[0];

  // Leading "±".
  if (h->negative) {
    *ptr++ = '-';
  } else if (options & WUFFS_BASE__RENDER_NUMBER_XXX__LEADING_PLUS_SIGN) {
    *ptr++ = '+';
  }

  // Integral digits.
  if (h->decimal_point <= 0) {
    *ptr++ = '0';
  } else {
    uint32_t m =
        wuffs_base__u32__min(h->num_digits, (uint32_t)(h->decimal_point));
    uint32_t i = 0;
    for (; i < m; i++) {
      *ptr++ = (uint8_t)('0' | h->digits[i]);
    }
    for (; i < (uint32_t)(h->decimal_point); i++) {
      *ptr++ = '0';
    }
  }

  // Separator and then fractional digits.
  if (precision > 0) {
    *ptr++ =
        (options & WUFFS_BASE__RENDER_NUMBER_FXX__DECIMAL_SEPARATOR_IS_A_COMMA)
            ? ','
            : '.';
    uint32_t i = 0;
    for (; i < precision; i++) {
      uint32_t j = ((uint32_t)(h->decimal_point)) + i;
      *ptr++ = (uint8_t)('0' | ((j < h->num_digits) ? h->digits[j] : 0));
    }
  }

  return n;
}

static size_t  //
wuffs_base__private_implementation__high_prec_dec__render_exponent_present(
    wuffs_base__slice_u8 dst,
    wuffs_base__private_implementation__high_prec_dec* h,
    uint32_t precision,
    uint32_t options) {
  int32_t exp = 0;
  if (h->num_digits > 0) {
    exp = h->decimal_point - 1;
  }
  bool negative_exp = exp < 0;
  if (negative_exp) {
    exp = -exp;
  }

  size_t n = (h->negative ||
              (options & WUFFS_BASE__RENDER_NUMBER_XXX__LEADING_PLUS_SIGN))
                 ? 4
                 : 3;  // Mininum 3 bytes: first digit and then "e±".
  if (precision > 0) {
    n += precision + 1;  // +1 for the '.'.
  }
  n += (exp < 100) ? 2 : 3;

  // Don't modify dst if the formatted number won't fit.
  if (n > dst.len) {
    return 0;
  }

  // Align-left or align-right.
  uint8_t* ptr = (options & WUFFS_BASE__RENDER_NUMBER_XXX__ALIGN_RIGHT)
                     ? &dst.ptr[dst.len - n]
                     : &dst.ptr[0];

  // Leading "±".
  if (h->negative) {
    *ptr++ = '-';
  } else if (options & WUFFS_BASE__RENDER_NUMBER_XXX__LEADING_PLUS_SIGN) {
    *ptr++ = '+';
  }

  // Integral digit.
  if (h->num_digits > 0) {
    *ptr++ = (uint8_t)('0' | h->digits[0]);
  } else {
    *ptr++ = '0';
  }

  // Separator and then fractional digits.
  if (precision > 0) {
    *ptr++ =
        (options & WUFFS_BASE__RENDER_NUMBER_FXX__DECIMAL_SEPARATOR_IS_A_COMMA)
            ? ','
            : '.';
    uint32_t i = 1;
    uint32_t j = wuffs_base__u32__min(h->num_digits, precision + 1);
    for (; i < j; i++) {
      *ptr++ = (uint8_t)('0' | h->digits[i]);
    }
    for (; i <= precision; i++) {
      *ptr++ = '0';
    }
  }

  // Exponent: "e±" and then 2 or 3 digits.
  *ptr++ = 'e';
  *ptr++ = negative_exp ? '-' : '+';
  if (exp < 10) {
    *ptr++ = '0';
    *ptr++ = (uint8_t)('0' | exp);
  } else if (exp < 100) {
    *ptr++ = (uint8_t)('0' | (exp / 10));
    *ptr++ = (uint8_t)('0' | (exp % 10));
  } else {
    int32_t e = exp / 100;
    exp -= e * 100;
    *ptr++ = (uint8_t)('0' | e);
    *ptr++ = (uint8_t)('0' | (exp / 10));
    *ptr++ = (uint8_t)('0' | (exp % 10));
  }

  return n;
}

WUFFS_BASE__MAYBE_STATIC size_t  //
wuffs_base__render_number_f64(wuffs_base__slice_u8 dst,
                              double x,
                              uint32_t precision,
                              uint32_t options) {
  // Decompose x (64 bits) into negativity (1 bit), base-2 exponent (11 bits
  // with a -1023 bias) and mantissa (52 bits).
  uint64_t bits = wuffs_base__ieee_754_bit_representation__from_f64_to_u64(x);
  bool neg = (bits >> 63) != 0;
  int32_t exp2 = ((int32_t)(bits >> 52)) & 0x7FF;
  uint64_t man = bits & 0x000FFFFFFFFFFFFFul;

  // Apply the exponent bias and set the implicit top bit of the mantissa,
  // unless x is subnormal. Also take care of Inf and NaN.
  if (exp2 == 0x7FF) {
    if (man != 0) {
      return wuffs_base__private_implementation__render_nan(dst);
    }
    return wuffs_base__private_implementation__render_inf(dst, neg, options);
  } else if (exp2 == 0) {
    exp2 = -1022;
  } else {
    exp2 -= 1023;
    man |= 0x0010000000000000ul;
  }

  // Ensure that precision isn't too large.
  if (precision > 4095) {
    precision = 4095;
  }

  // Convert from the (neg, exp2, man) tuple to an HPD.
  wuffs_base__private_implementation__high_prec_dec h;
  wuffs_base__private_implementation__high_prec_dec__assign(&h, man, neg);
  if (h.num_digits > 0) {
    wuffs_base__private_implementation__high_prec_dec__lshift(
        &h, exp2 - 52);  // 52 mantissa bits.
  }

  // Handle the "%e" and "%f" formats.
  switch (options & (WUFFS_BASE__RENDER_NUMBER_FXX__EXPONENT_ABSENT |
                     WUFFS_BASE__RENDER_NUMBER_FXX__EXPONENT_PRESENT)) {
    case WUFFS_BASE__RENDER_NUMBER_FXX__EXPONENT_ABSENT:  // The "%"f" format.
      if (options & WUFFS_BASE__RENDER_NUMBER_FXX__JUST_ENOUGH_PRECISION) {
        wuffs_base__private_implementation__high_prec_dec__round_just_enough(
            &h, exp2, man);
        int32_t p = ((int32_t)(h.num_digits)) - h.decimal_point;
        precision = ((uint32_t)(wuffs_base__i32__max(0, p)));
      } else {
        wuffs_base__private_implementation__high_prec_dec__round_nearest(
            &h, ((int32_t)precision) + h.decimal_point);
      }
      return wuffs_base__private_implementation__high_prec_dec__render_exponent_absent(
          dst, &h, precision, options);

    case WUFFS_BASE__RENDER_NUMBER_FXX__EXPONENT_PRESENT:  // The "%e" format.
      if (options & WUFFS_BASE__RENDER_NUMBER_FXX__JUST_ENOUGH_PRECISION) {
        wuffs_base__private_implementation__high_prec_dec__round_just_enough(
            &h, exp2, man);
        precision = (h.num_digits > 0) ? (h.num_digits - 1) : 0;
      } else {
        wuffs_base__private_implementation__high_prec_dec__round_nearest(
            &h, ((int32_t)precision) + 1);
      }
      return wuffs_base__private_implementation__high_prec_dec__render_exponent_present(
          dst, &h, precision, options);
  }

  // We have the "%g" format and so precision means the number of significant
  // digits, not the number of digits after the decimal separator. Perform
  // rounding and determine whether to use "%e" or "%f".
  int32_t e_threshold = 0;
  if (options & WUFFS_BASE__RENDER_NUMBER_FXX__JUST_ENOUGH_PRECISION) {
    wuffs_base__private_implementation__high_prec_dec__round_just_enough(
        &h, exp2, man);
    precision = h.num_digits;
    e_threshold = 6;
  } else {
    if (precision == 0) {
      precision = 1;
    }
    wuffs_base__private_implementation__high_prec_dec__round_nearest(
        &h, ((int32_t)precision));
    e_threshold = ((int32_t)precision);
    int32_t nd = ((int32_t)(h.num_digits));
    if ((e_threshold > nd) && (nd >= h.decimal_point)) {
      e_threshold = nd;
    }
  }

  // Use the "%e" format if the exponent is large.
  int32_t e = h.decimal_point - 1;
  if ((e < -4) || (e_threshold <= e)) {
    uint32_t p = wuffs_base__u32__min(precision, h.num_digits);
    return wuffs_base__private_implementation__high_prec_dec__render_exponent_present(
        dst, &h, (p > 0) ? (p - 1) : 0, options);
  }

  // Use the "%f" format otherwise.
  int32_t p = ((int32_t)precision);
  if (p > h.decimal_point) {
    p = ((int32_t)(h.num_digits));
  }
  precision = ((uint32_t)(wuffs_base__i32__max(0, p - h.decimal_point)));
  return wuffs_base__private_implementation__high_prec_dec__render_exponent_absent(
      dst, &h, precision, options);
}

#endif  // !defined(WUFFS_CONFIG__MODULES) ||
        // defined(WUFFS_CONFIG__MODULE__BASE) ||
        // defined(WUFFS_CONFIG__MODULE__BASE__FLOATCONV)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BASE) || \
    defined(WUFFS_CONFIG__MODULE__BASE__INTCONV)

// ---------------- Integer

// wuffs_base__parse_number__foo_digits entries are 0x00 for invalid digits,
// and (0x80 | v) for valid digits, where v is the 4 bit value.

static const uint8_t wuffs_base__parse_number__decimal_digits[256] = {
    // 0     1     2     3     4     5     6     7
    // 8     9     A     B     C     D     E     F
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x00 ..= 0x07.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x08 ..= 0x0F.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x10 ..= 0x17.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x18 ..= 0x1F.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x20 ..= 0x27.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x28 ..= 0x2F.
    0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,  // 0x30 ..= 0x37. '0'-'7'.
    0x88, 0x89, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x38 ..= 0x3F. '8'-'9'.

    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x40 ..= 0x47.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x48 ..= 0x4F.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x50 ..= 0x57.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x58 ..= 0x5F.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x60 ..= 0x67.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x68 ..= 0x6F.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x70 ..= 0x77.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x78 ..= 0x7F.

    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x80 ..= 0x87.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x88 ..= 0x8F.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x90 ..= 0x97.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x98 ..= 0x9F.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xA0 ..= 0xA7.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xA8 ..= 0xAF.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xB0 ..= 0xB7.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xB8 ..= 0xBF.

    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xC0 ..= 0xC7.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xC8 ..= 0xCF.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xD0 ..= 0xD7.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xD8 ..= 0xDF.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xE0 ..= 0xE7.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xE8 ..= 0xEF.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xF0 ..= 0xF7.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xF8 ..= 0xFF.
    // 0     1     2     3     4     5     6     7
    // 8     9     A     B     C     D     E     F
};

static const uint8_t wuffs_base__parse_number__hexadecimal_digits[256] = {
    // 0     1     2     3     4     5     6     7
    // 8     9     A     B     C     D     E     F
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x00 ..= 0x07.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x08 ..= 0x0F.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x10 ..= 0x17.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x18 ..= 0x1F.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x20 ..= 0x27.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x28 ..= 0x2F.
    0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,  // 0x30 ..= 0x37. '0'-'7'.
    0x88, 0x89, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x38 ..= 0x3F. '8'-'9'.

    0x00, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x00,  // 0x40 ..= 0x47. 'A'-'F'.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x48 ..= 0x4F.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x50 ..= 0x57.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x58 ..= 0x5F.
    0x00, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x00,  // 0x60 ..= 0x67. 'a'-'f'.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x68 ..= 0x6F.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x70 ..= 0x77.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x78 ..= 0x7F.

    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x80 ..= 0x87.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x88 ..= 0x8F.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x90 ..= 0x97.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x98 ..= 0x9F.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xA0 ..= 0xA7.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xA8 ..= 0xAF.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xB0 ..= 0xB7.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xB8 ..= 0xBF.

    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xC0 ..= 0xC7.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xC8 ..= 0xCF.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xD0 ..= 0xD7.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xD8 ..= 0xDF.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xE0 ..= 0xE7.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xE8 ..= 0xEF.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xF0 ..= 0xF7.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xF8 ..= 0xFF.
    // 0     1     2     3     4     5     6     7
    // 8     9     A     B     C     D     E     F
};

static const uint8_t wuffs_base__private_implementation__encode_base16[16] = {
    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,  // 0x00 ..= 0x07.
    0x38, 0x39, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46,  // 0x08 ..= 0x0F.
};

// --------

WUFFS_BASE__MAYBE_STATIC wuffs_base__result_i64  //
wuffs_base__parse_number_i64(wuffs_base__slice_u8 s, uint32_t options) {
  uint8_t* p = s.ptr;
  uint8_t* q = s.ptr + s.len;

  if (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES) {
    for (; (p < q) && (*p == '_'); p++) {
    }
  }

  bool negative = false;
  if (p >= q) {
    goto fail_bad_argument;
  } else if (*p == '-') {
    p++;
    negative = true;
  } else if (*p == '+') {
    p++;
  }

  do {
    wuffs_base__result_u64 r = wuffs_base__parse_number_u64(
        wuffs_base__make_slice_u8(p, (size_t)(q - p)), options);
    if (r.status.repr != NULL) {
      wuffs_base__result_i64 ret;
      ret.status.repr = r.status.repr;
      ret.value = 0;
      return ret;
    } else if (negative) {
      if (r.value > 0x8000000000000000) {
        goto fail_out_of_bounds;
      }
      wuffs_base__result_i64 ret;
      ret.status.repr = NULL;
      ret.value = -(int64_t)(r.value);
      return ret;
    } else if (r.value > 0x7FFFFFFFFFFFFFFF) {
      goto fail_out_of_bounds;
    } else {
      wuffs_base__result_i64 ret;
      ret.status.repr = NULL;
      ret.value = +(int64_t)(r.value);
      return ret;
    }
  } while (0);

fail_bad_argument:
  do {
    wuffs_base__result_i64 ret;
    ret.status.repr = wuffs_base__error__bad_argument;
    ret.value = 0;
    return ret;
  } while (0);

fail_out_of_bounds:
  do {
    wuffs_base__result_i64 ret;
    ret.status.repr = wuffs_base__error__out_of_bounds;
    ret.value = 0;
    return ret;
  } while (0);
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__result_u64  //
wuffs_base__parse_number_u64(wuffs_base__slice_u8 s, uint32_t options) {
  uint8_t* p = s.ptr;
  uint8_t* q = s.ptr + s.len;

  if (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES) {
    for (; (p < q) && (*p == '_'); p++) {
    }
  }

  if (p >= q) {
    goto fail_bad_argument;

  } else if (*p == '0') {
    p++;
    if (p >= q) {
      goto ok_zero;
    }
    if (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES) {
      if (*p == '_') {
        p++;
        for (; p < q; p++) {
          if (*p != '_') {
            if (options &
                WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_MULTIPLE_LEADING_ZEROES) {
              goto decimal;
            }
            goto fail_bad_argument;
          }
        }
        goto ok_zero;
      }
    }

    if ((*p == 'x') || (*p == 'X')) {
      p++;
      if (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES) {
        for (; (p < q) && (*p == '_'); p++) {
        }
      }
      if (p < q) {
        goto hexadecimal;
      }

    } else if ((*p == 'd') || (*p == 'D')) {
      p++;
      if (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES) {
        for (; (p < q) && (*p == '_'); p++) {
        }
      }
      if (p < q) {
        goto decimal;
      }
    }

    if (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_MULTIPLE_LEADING_ZEROES) {
      goto decimal;
    }
    goto fail_bad_argument;
  }

decimal:
  do {
    uint64_t v = wuffs_base__parse_number__decimal_digits[*p++];
    if (v == 0) {
      goto fail_bad_argument;
    }
    v &= 0x0F;

    // UINT64_MAX is 18446744073709551615, which is ((10 * max10) + max1).
    const uint64_t max10 = 1844674407370955161u;
    const uint8_t max1 = 5;

    for (; p < q; p++) {
      if ((*p == '_') &&
          (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES)) {
        continue;
      }
      uint8_t digit = wuffs_base__parse_number__decimal_digits[*p];
      if (digit == 0) {
        goto fail_bad_argument;
      }
      digit &= 0x0F;
      if ((v > max10) || ((v == max10) && (digit > max1))) {
        goto fail_out_of_bounds;
      }
      v = (10 * v) + ((uint64_t)(digit));
    }

    wuffs_base__result_u64 ret;
    ret.status.repr = NULL;
    ret.value = v;
    return ret;
  } while (0);

hexadecimal:
  do {
    uint64_t v = wuffs_base__parse_number__hexadecimal_digits[*p++];
    if (v == 0) {
      goto fail_bad_argument;
    }
    v &= 0x0F;

    for (; p < q; p++) {
      if ((*p == '_') &&
          (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES)) {
        continue;
      }
      uint8_t digit = wuffs_base__parse_number__hexadecimal_digits[*p];
      if (digit == 0) {
        goto fail_bad_argument;
      }
      digit &= 0x0F;
      if ((v >> 60) != 0) {
        goto fail_out_of_bounds;
      }
      v = (v << 4) | ((uint64_t)(digit));
    }

    wuffs_base__result_u64 ret;
    ret.status.repr = NULL;
    ret.value = v;
    return ret;
  } while (0);

ok_zero:
  do {
    wuffs_base__result_u64 ret;
    ret.status.repr = NULL;
    ret.value = 0;
    return ret;
  } while (0);

fail_bad_argument:
  do {
    wuffs_base__result_u64 ret;
    ret.status.repr = wuffs_base__error__bad_argument;
    ret.value = 0;
    return ret;
  } while (0);

fail_out_of_bounds:
  do {
    wuffs_base__result_u64 ret;
    ret.status.repr = wuffs_base__error__out_of_bounds;
    ret.value = 0;
    return ret;
  } while (0);
}

// --------

// wuffs_base__render_number__first_hundred contains the decimal encodings of
// the first one hundred numbers [0 ..= 99].
static const uint8_t wuffs_base__render_number__first_hundred[200] = {
    '0', '0', '0', '1', '0', '2', '0', '3', '0', '4',  //
    '0', '5', '0', '6', '0', '7', '0', '8', '0', '9',  //
    '1', '0', '1', '1', '1', '2', '1', '3', '1', '4',  //
    '1', '5', '1', '6', '1', '7', '1', '8', '1', '9',  //
    '2', '0', '2', '1', '2', '2', '2', '3', '2', '4',  //
    '2', '5', '2', '6', '2', '7', '2', '8', '2', '9',  //
    '3', '0', '3', '1', '3', '2', '3', '3', '3', '4',  //
    '3', '5', '3', '6', '3', '7', '3', '8', '3', '9',  //
    '4', '0', '4', '1', '4', '2', '4', '3', '4', '4',  //
    '4', '5', '4', '6', '4', '7', '4', '8', '4', '9',  //
    '5', '0', '5', '1', '5', '2', '5', '3', '5', '4',  //
    '5', '5', '5', '6', '5', '7', '5', '8', '5', '9',  //
    '6', '0', '6', '1', '6', '2', '6', '3', '6', '4',  //
    '6', '5', '6', '6', '6', '7', '6', '8', '6', '9',  //
    '7', '0', '7', '1', '7', '2', '7', '3', '7', '4',  //
    '7', '5', '7', '6', '7', '7', '7', '8', '7', '9',  //
    '8', '0', '8', '1', '8', '2', '8', '3', '8', '4',  //
    '8', '5', '8', '6', '8', '7', '8', '8', '8', '9',  //
    '9', '0', '9', '1', '9', '2', '9', '3', '9', '4',  //
    '9', '5', '9', '6', '9', '7', '9', '8', '9', '9',  //
};

static size_t  //
wuffs_base__private_implementation__render_number_u64(wuffs_base__slice_u8 dst,
                                                      uint64_t x,
                                                      uint32_t options,
                                                      bool neg) {
  uint8_t buf[WUFFS_BASE__U64__BYTE_LENGTH__MAX_INCL];
  uint8_t* ptr = &buf[0] + sizeof(buf);

  while (x >= 100) {
    size_t index = ((size_t)((x % 100) * 2));
    x /= 100;
    uint8_t s0 = wuffs_base__render_number__first_hundred[index + 0];
    uint8_t s1 = wuffs_base__render_number__first_hundred[index + 1];
    ptr -= 2;
    ptr[0] = s0;
    ptr[1] = s1;
  }

  if (x < 10) {
    ptr -= 1;
    ptr[0] = (uint8_t)('0' + x);
  } else {
    size_t index = ((size_t)(x * 2));
    uint8_t s0 = wuffs_base__render_number__first_hundred[index + 0];
    uint8_t s1 = wuffs_base__render_number__first_hundred[index + 1];
    ptr -= 2;
    ptr[0] = s0;
    ptr[1] = s1;
  }

  if (neg) {
    ptr -= 1;
    ptr[0] = '-';
  } else if (options & WUFFS_BASE__RENDER_NUMBER_XXX__LEADING_PLUS_SIGN) {
    ptr -= 1;
    ptr[0] = '+';
  }

  size_t n = sizeof(buf) - ((size_t)(ptr - &buf[0]));
  if (n > dst.len) {
    return 0;
  }
  memcpy(dst.ptr + ((options & WUFFS_BASE__RENDER_NUMBER_XXX__ALIGN_RIGHT)
                        ? (dst.len - n)
                        : 0),
         ptr, n);
  return n;
}

WUFFS_BASE__MAYBE_STATIC size_t  //
wuffs_base__render_number_i64(wuffs_base__slice_u8 dst,
                              int64_t x,
                              uint32_t options) {
  uint64_t u = (uint64_t)x;
  bool neg = x < 0;
  if (neg) {
    u = 1 + ~u;
  }
  return wuffs_base__private_implementation__render_number_u64(dst, u, options,
                                                               neg);
}

WUFFS_BASE__MAYBE_STATIC size_t  //
wuffs_base__render_number_u64(wuffs_base__slice_u8 dst,
                              uint64_t x,
                              uint32_t options) {
  return wuffs_base__private_implementation__render_number_u64(dst, x, options,
                                                               false);
}

// ---------------- Base-16

WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
wuffs_base__base_16__decode2(wuffs_base__slice_u8 dst,
                             wuffs_base__slice_u8 src,
                             bool src_closed,
                             uint32_t options) {
  wuffs_base__transform__output o;
  size_t src_len2 = src.len / 2;
  size_t len;
  if (dst.len < src_len2) {
    len = dst.len;
    o.status.repr = wuffs_base__suspension__short_write;
  } else {
    len = src_len2;
    if (!src_closed) {
      o.status.repr = wuffs_base__suspension__short_read;
    } else if (src.len & 1) {
      o.status.repr = wuffs_base__error__bad_data;
    } else {
      o.status.repr = NULL;
    }
  }

  uint8_t* d = dst.ptr;
  uint8_t* s = src.ptr;
  size_t n = len;

  while (n--) {
    *d = (uint8_t)((wuffs_base__parse_number__hexadecimal_digits[s[0]] << 4) |
                   (wuffs_base__parse_number__hexadecimal_digits[s[1]] & 0x0F));
    d += 1;
    s += 2;
  }

  o.num_dst = len;
  o.num_src = len * 2;
  return o;
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
wuffs_base__base_16__decode4(wuffs_base__slice_u8 dst,
                             wuffs_base__slice_u8 src,
                             bool src_closed,
                             uint32_t options) {
  wuffs_base__transform__output o;
  size_t src_len4 = src.len / 4;
  size_t len = dst.len < src_len4 ? dst.len : src_len4;
  if (dst.len < src_len4) {
    len = dst.len;
    o.status.repr = wuffs_base__suspension__short_write;
  } else {
    len = src_len4;
    if (!src_closed) {
      o.status.repr = wuffs_base__suspension__short_read;
    } else if (src.len & 1) {
      o.status.repr = wuffs_base__error__bad_data;
    } else {
      o.status.repr = NULL;
    }
  }

  uint8_t* d = dst.ptr;
  uint8_t* s = src.ptr;
  size_t n = len;

  while (n--) {
    *d = (uint8_t)((wuffs_base__parse_number__hexadecimal_digits[s[2]] << 4) |
                   (wuffs_base__parse_number__hexadecimal_digits[s[3]] & 0x0F));
    d += 1;
    s += 4;
  }

  o.num_dst = len;
  o.num_src = len * 4;
  return o;
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
wuffs_base__base_16__encode2(wuffs_base__slice_u8 dst,
                             wuffs_base__slice_u8 src,
                             bool src_closed,
                             uint32_t options) {
  wuffs_base__transform__output o;
  size_t dst_len2 = dst.len / 2;
  size_t len;
  if (dst_len2 < src.len) {
    len = dst_len2;
    o.status.repr = wuffs_base__suspension__short_write;
  } else {
    len = src.len;
    if (!src_closed) {
      o.status.repr = wuffs_base__suspension__short_read;
    } else {
      o.status.repr = NULL;
    }
  }

  uint8_t* d = dst.ptr;
  uint8_t* s = src.ptr;
  size_t n = len;

  while (n--) {
    uint8_t c = *s;
    d[0] = wuffs_base__private_implementation__encode_base16[c >> 4];
    d[1] = wuffs_base__private_implementation__encode_base16[c & 0x0F];
    d += 2;
    s += 1;
  }

  o.num_dst = len * 2;
  o.num_src = len;
  return o;
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
wuffs_base__base_16__encode4(wuffs_base__slice_u8 dst,
                             wuffs_base__slice_u8 src,
                             bool src_closed,
                             uint32_t options) {
  wuffs_base__transform__output o;
  size_t dst_len4 = dst.len / 4;
  size_t len;
  if (dst_len4 < src.len) {
    len = dst_len4;
    o.status.repr = wuffs_base__suspension__short_write;
  } else {
    len = src.len;
    if (!src_closed) {
      o.status.repr = wuffs_base__suspension__short_read;
    } else {
      o.status.repr = NULL;
    }
  }

  uint8_t* d = dst.ptr;
  uint8_t* s = src.ptr;
  size_t n = len;

  while (n--) {
    uint8_t c = *s;
    d[0] = '\\';
    d[1] = 'x';
    d[2] = wuffs_base__private_implementation__encode_base16[c >> 4];
    d[3] = wuffs_base__private_implementation__encode_base16[c & 0x0F];
    d += 4;
    s += 1;
  }

  o.num_dst = len * 4;
  o.num_src = len;
  return o;
}

// ---------------- Base-64

// The two base-64 alphabets, std and url, differ only in the last two codes.
//  - std: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
//  - url: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"

static const uint8_t wuffs_base__base_64__decode_std[256] = {
    // 0     1     2     3     4     5     6     7
    // 8     9     A     B     C     D     E     F
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x00 ..= 0x07.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x08 ..= 0x0F.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x10 ..= 0x17.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x18 ..= 0x1F.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x20 ..= 0x27.
    0x80, 0x80, 0x80, 0x3E, 0x80, 0x80, 0x80, 0x3F,  // 0x28 ..= 0x2F.
    0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B,  // 0x30 ..= 0x37.
    0x3C, 0x3D, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x38 ..= 0x3F.

    0x80, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,  // 0x40 ..= 0x47.
    0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,  // 0x48 ..= 0x4F.
    0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,  // 0x50 ..= 0x57.
    0x17, 0x18, 0x19, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x58 ..= 0x5F.
    0x80, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20,  // 0x60 ..= 0x67.
    0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,  // 0x68 ..= 0x6F.
    0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30,  // 0x70 ..= 0x77.
    0x31, 0x32, 0x33, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x78 ..= 0x7F.

    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x80 ..= 0x87.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x88 ..= 0x8F.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x90 ..= 0x97.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x98 ..= 0x9F.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xA0 ..= 0xA7.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xA8 ..= 0xAF.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xB0 ..= 0xB7.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xB8 ..= 0xBF.

    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xC0 ..= 0xC7.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xC8 ..= 0xCF.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xD0 ..= 0xD7.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xD8 ..= 0xDF.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xE0 ..= 0xE7.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xE8 ..= 0xEF.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xF0 ..= 0xF7.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xF8 ..= 0xFF.
    // 0     1     2     3     4     5     6     7
    // 8     9     A     B     C     D     E     F
};

static const uint8_t wuffs_base__base_64__decode_url[256] = {
    // 0     1     2     3     4     5     6     7
    // 8     9     A     B     C     D     E     F
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x00 ..= 0x07.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x08 ..= 0x0F.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x10 ..= 0x17.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x18 ..= 0x1F.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x20 ..= 0x27.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x3E, 0x80, 0x80,  // 0x28 ..= 0x2F.
    0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B,  // 0x30 ..= 0x37.
    0x3C, 0x3D, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x38 ..= 0x3F.

    0x80, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,  // 0x40 ..= 0x47.
    0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,  // 0x48 ..= 0x4F.
    0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,  // 0x50 ..= 0x57.
    0x17, 0x18, 0x19, 0x80, 0x80, 0x80, 0x80, 0x3F,  // 0x58 ..= 0x5F.
    0x80, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20,  // 0x60 ..= 0x67.
    0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,  // 0x68 ..= 0x6F.
    0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30,  // 0x70 ..= 0x77.
    0x31, 0x32, 0x33, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x78 ..= 0x7F.

    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x80 ..= 0x87.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x88 ..= 0x8F.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x90 ..= 0x97.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x98 ..= 0x9F.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xA0 ..= 0xA7.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xA8 ..= 0xAF.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xB0 ..= 0xB7.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xB8 ..= 0xBF.

    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xC0 ..= 0xC7.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xC8 ..= 0xCF.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xD0 ..= 0xD7.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xD8 ..= 0xDF.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xE0 ..= 0xE7.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xE8 ..= 0xEF.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xF0 ..= 0xF7.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xF8 ..= 0xFF.
    // 0     1     2     3     4     5     6     7
    // 8     9     A     B     C     D     E     F
};

static const uint8_t wuffs_base__base_64__encode_std[64] = {
    // 0     1     2     3     4     5     6     7
    // 8     9     A     B     C     D     E     F
    0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,  // 0x00 ..= 0x07.
    0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50,  // 0x08 ..= 0x0F.
    0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,  // 0x10 ..= 0x17.
    0x59, 0x5A, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,  // 0x18 ..= 0x1F.
    0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E,  // 0x20 ..= 0x27.
    0x6F, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76,  // 0x28 ..= 0x2F.
    0x77, 0x78, 0x79, 0x7A, 0x30, 0x31, 0x32, 0x33,  // 0x30 ..= 0x37.
    0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x2B, 0x2F,  // 0x38 ..= 0x3F.
};

static const uint8_t wuffs_base__base_64__encode_url[64] = {
    // 0     1     2     3     4     5     6     7
    // 8     9     A     B     C     D     E     F
    0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,  // 0x00 ..= 0x07.
    0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50,  // 0x08 ..= 0x0F.
    0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,  // 0x10 ..= 0x17.
    0x59, 0x5A, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,  // 0x18 ..= 0x1F.
    0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E,  // 0x20 ..= 0x27.
    0x6F, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76,  // 0x28 ..= 0x2F.
    0x77, 0x78, 0x79, 0x7A, 0x30, 0x31, 0x32, 0x33,  // 0x30 ..= 0x37.
    0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x2D, 0x5F,  // 0x38 ..= 0x3F.
};

// --------

WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
wuffs_base__base_64__decode(wuffs_base__slice_u8 dst,
                            wuffs_base__slice_u8 src,
                            bool src_closed,
                            uint32_t options) {
  const uint8_t* alphabet = (options & WUFFS_BASE__BASE_64__URL_ALPHABET)
                                ? wuffs_base__base_64__decode_url
                                : wuffs_base__base_64__decode_std;
  wuffs_base__transform__output o;
  uint8_t* d_ptr = dst.ptr;
  size_t d_len = dst.len;
  const uint8_t* s_ptr = src.ptr;
  size_t s_len = src.len;
  bool pad = false;

  while (s_len >= 4) {
    uint32_t s = wuffs_base__peek_u32le__no_bounds_check(s_ptr);
    uint32_t s0 = alphabet[0xFF & (s >> 0)];
    uint32_t s1 = alphabet[0xFF & (s >> 8)];
    uint32_t s2 = alphabet[0xFF & (s >> 16)];
    uint32_t s3 = alphabet[0xFF & (s >> 24)];

    if (((s0 | s1 | s2 | s3) & 0xC0) != 0) {
      if (s_len > 4) {
        o.status.repr = wuffs_base__error__bad_data;
        goto done;
      } else if (!src_closed) {
        o.status.repr = wuffs_base__suspension__short_read;
        goto done;
      } else if ((options & WUFFS_BASE__BASE_64__DECODE_ALLOW_PADDING) &&
                 (s_ptr[3] == '=')) {
        pad = true;
        if (s_ptr[2] == '=') {
          goto src2;
        }
        goto src3;
      }
      o.status.repr = wuffs_base__error__bad_data;
      goto done;
    }

    if (d_len < 3) {
      o.status.repr = wuffs_base__suspension__short_write;
      goto done;
    }

    s_ptr += 4;
    s_len -= 4;
    s = (s0 << 18) | (s1 << 12) | (s2 << 6) | (s3 << 0);
    *d_ptr++ = (uint8_t)(s >> 16);
    *d_ptr++ = (uint8_t)(s >> 8);
    *d_ptr++ = (uint8_t)(s >> 0);
    d_len -= 3;
  }

  if (!src_closed) {
    o.status.repr = wuffs_base__suspension__short_read;
    goto done;
  }

  if (s_len == 0) {
    o.status.repr = NULL;
    goto done;
  } else if (s_len == 1) {
    o.status.repr = wuffs_base__error__bad_data;
    goto done;
  } else if (s_len == 2) {
    goto src2;
  }

src3:
  do {
    uint32_t s = wuffs_base__peek_u24le__no_bounds_check(s_ptr);
    uint32_t s0 = alphabet[0xFF & (s >> 0)];
    uint32_t s1 = alphabet[0xFF & (s >> 8)];
    uint32_t s2 = alphabet[0xFF & (s >> 16)];
    if ((s0 & 0xC0) || (s1 & 0xC0) || (s2 & 0xC3)) {
      o.status.repr = wuffs_base__error__bad_data;
      goto done;
    }
    if (d_len < 2) {
      o.status.repr = wuffs_base__suspension__short_write;
      goto done;
    }
    s_ptr += pad ? 4 : 3;
    s = (s0 << 18) | (s1 << 12) | (s2 << 6);
    *d_ptr++ = (uint8_t)(s >> 16);
    *d_ptr++ = (uint8_t)(s >> 8);
    o.status.repr = NULL;
    goto done;
  } while (0);

src2:
  do {
    uint32_t s = wuffs_base__peek_u16le__no_bounds_check(s_ptr);
    uint32_t s0 = alphabet[0xFF & (s >> 0)];
    uint32_t s1 = alphabet[0xFF & (s >> 8)];
    if ((s0 & 0xC0) || (s1 & 0xCF)) {
      o.status.repr = wuffs_base__error__bad_data;
      goto done;
    }
    if (d_len < 1) {
      o.status.repr = wuffs_base__suspension__short_write;
      goto done;
    }
    s_ptr += pad ? 4 : 2;
    s = (s0 << 18) | (s1 << 12);
    *d_ptr++ = (uint8_t)(s >> 16);
    o.status.repr = NULL;
    goto done;
  } while (0);

done:
  o.num_dst = (size_t)(d_ptr - dst.ptr);
  o.num_src = (size_t)(s_ptr - src.ptr);
  return o;
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
wuffs_base__base_64__encode(wuffs_base__slice_u8 dst,
                            wuffs_base__slice_u8 src,
                            bool src_closed,
                            uint32_t options) {
  const uint8_t* alphabet = (options & WUFFS_BASE__BASE_64__URL_ALPHABET)
                                ? wuffs_base__base_64__encode_url
                                : wuffs_base__base_64__encode_std;
  wuffs_base__transform__output o;
  uint8_t* d_ptr = dst.ptr;
  size_t d_len = dst.len;
  const uint8_t* s_ptr = src.ptr;
  size_t s_len = src.len;

  do {
    while (s_len >= 3) {
      if (d_len < 4) {
        o.status.repr = wuffs_base__suspension__short_write;
        goto done;
      }
      uint32_t s = wuffs_base__peek_u24be__no_bounds_check(s_ptr);
      s_ptr += 3;
      s_len -= 3;
      *d_ptr++ = alphabet[0x3F & (s >> 18)];
      *d_ptr++ = alphabet[0x3F & (s >> 12)];
      *d_ptr++ = alphabet[0x3F & (s >> 6)];
      *d_ptr++ = alphabet[0x3F & (s >> 0)];
      d_len -= 4;
    }

    if (!src_closed) {
      o.status.repr = wuffs_base__suspension__short_read;
      goto done;
    }

    if (s_len == 2) {
      if (d_len <
          ((options & WUFFS_BASE__BASE_64__ENCODE_EMIT_PADDING) ? 4 : 3)) {
        o.status.repr = wuffs_base__suspension__short_write;
        goto done;
      }
      uint32_t s = ((uint32_t)(wuffs_base__peek_u16be__no_bounds_check(s_ptr)))
                   << 8;
      s_ptr += 2;
      *d_ptr++ = alphabet[0x3F & (s >> 18)];
      *d_ptr++ = alphabet[0x3F & (s >> 12)];
      *d_ptr++ = alphabet[0x3F & (s >> 6)];
      if (options & WUFFS_BASE__BASE_64__ENCODE_EMIT_PADDING) {
        *d_ptr++ = '=';
      }
      o.status.repr = NULL;
      goto done;

    } else if (s_len == 1) {
      if (d_len <
          ((options & WUFFS_BASE__BASE_64__ENCODE_EMIT_PADDING) ? 4 : 2)) {
        o.status.repr = wuffs_base__suspension__short_write;
        goto done;
      }
      uint32_t s = ((uint32_t)(wuffs_base__peek_u8__no_bounds_check(s_ptr)))
                   << 16;
      s_ptr += 1;
      *d_ptr++ = alphabet[0x3F & (s >> 18)];
      *d_ptr++ = alphabet[0x3F & (s >> 12)];
      if (options & WUFFS_BASE__BASE_64__ENCODE_EMIT_PADDING) {
        *d_ptr++ = '=';
        *d_ptr++ = '=';
      }
      o.status.repr = NULL;
      goto done;

    } else {
      o.status.repr = NULL;
      goto done;
    }
  } while (0);

done:
  o.num_dst = (size_t)(d_ptr - dst.ptr);
  o.num_src = (size_t)(s_ptr - src.ptr);
  return o;
}

#endif  // !defined(WUFFS_CONFIG__MODULES) ||
        // defined(WUFFS_CONFIG__MODULE__BASE) ||
        // defined(WUFFS_CONFIG__MODULE__BASE__INTCONV)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BASE) || \
    defined(WUFFS_CONFIG__MODULE__BASE__MAGIC)

// ---------------- Magic Numbers

WUFFS_BASE__MAYBE_STATIC int32_t  //
wuffs_base__magic_number_guess_fourcc(wuffs_base__slice_u8 prefix) {
  // table holds the 'magic numbers' (which are actually variable length
  // strings). The strings may contain NUL bytes, so the "const char* magic"
  // value starts with the length-minus-1 of the 'magic number'.
  //
  // Keep it sorted by magic[1], then magic[0] descending and finally by
  // magic[2:]. When multiple entries match, the longest one wins.
  static struct {
    int32_t fourcc;
    const char* magic;
  } table[] = {
      {0x57424D50, "\x01\x00\x00"},          // WBMP
      {0x424D5020, "\x01\x42\x4D"},          // BMP
      {0x47494620, "\x03\x47\x49\x46\x38"},  // GIF
      {0x54494646, "\x03\x49\x49\x2A\x00"},  // TIFF (little-endian)
      {0x54494646, "\x03\x4D\x4D\x00\x2A"},  // TIFF (big-endian)
      {0x52494646, "\x03\x52\x49\x46\x46"},  // RIFF (see § below)
      {0x4E494520, "\x02\x6E\xC3\xAF"},      // NIE
      {0x504E4720, "\x03\x89\x50\x4E\x47"},  // PNG
      {0x4A504547, "\x01\xFF\xD8"},          // JPEG
  };
  static const size_t table_len = sizeof(table) / sizeof(table[0]);

  if (prefix.len == 0) {
    return -1;
  }
  uint8_t pre_first_byte = prefix.ptr[0];

  int32_t fourcc = 0;
  size_t i;
  for (i = 0; i < table_len; i++) {
    uint8_t mag_first_byte = table[i].magic[1];
    if (pre_first_byte < mag_first_byte) {
      break;
    } else if (pre_first_byte > mag_first_byte) {
      continue;
    }
    fourcc = table[i].fourcc;

    uint8_t mag_remaining_len = table[i].magic[0];
    if (mag_remaining_len == 0) {
      goto match;
    }

    const char* mag_remaining_ptr = table[i].magic + 2;
    uint8_t* pre_remaining_ptr = prefix.ptr + 1;
    size_t pre_remaining_len = prefix.len - 1;
    if (pre_remaining_len < mag_remaining_len) {
      if (!memcmp(pre_remaining_ptr, mag_remaining_ptr, pre_remaining_len)) {
        return -1;
      }
    } else {
      if (!memcmp(pre_remaining_ptr, mag_remaining_ptr, mag_remaining_len)) {
        goto match;
      }
    }
  }
  return 0;

match:
  // Some FourCC values (see § above) are further specialized.
  if (fourcc == 0x52494646) {  // 'RIFF'be
    if (prefix.len < 16) {
      return -1;
    }
    uint32_t x = wuffs_base__peek_u32be__no_bounds_check(prefix.ptr + 8);
    if (x == 0x57454250) {  // 'WEBP'be
      uint32_t y = wuffs_base__peek_u32be__no_bounds_check(prefix.ptr + 12);
      if (y == 0x56503820) {         // 'VP8 'be
        return 0x57503820;           // 'WP8 'be
      } else if (y == 0x5650384C) {  // 'VP8L'be
        return 0x5750384C;           // 'WP8L'be
      }
    }
  }
  return fourcc;
}

#endif  // !defined(WUFFS_CONFIG__MODULES) ||
        // defined(WUFFS_CONFIG__MODULE__BASE) ||
        // defined(WUFFS_CONFIG__MODULE__BASE__MAGIC)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BASE) || \
    defined(WUFFS_CONFIG__MODULE__BASE__PIXCONV)

// ---------------- Pixel Swizzler

static inline uint32_t  //
wuffs_base__swap_u32_argb_abgr(uint32_t u) {
  uint32_t o = u & 0xFF00FF00;
  uint32_t r = u & 0x00FF0000;
  uint32_t b = u & 0x000000FF;
  return o | (r >> 16) | (b << 16);
}

// --------

WUFFS_BASE__MAYBE_STATIC wuffs_base__color_u32_argb_premul  //
wuffs_base__pixel_buffer__color_u32_at(const wuffs_base__pixel_buffer* pb,
                                       uint32_t x,
                                       uint32_t y) {
  if (!pb || (x >= pb->pixcfg.private_impl.width) ||
      (y >= pb->pixcfg.private_impl.height)) {
    return 0;
  }

  if (wuffs_base__pixel_format__is_planar(&pb->pixcfg.private_impl.pixfmt)) {
    // TODO: support planar formats.
    return 0;
  }

  size_t stride = pb->private_impl.planes[0].stride;
  const uint8_t* row = pb->private_impl.planes[0].ptr + (stride * ((size_t)y));

  switch (pb->pixcfg.private_impl.pixfmt.repr) {
    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
      return wuffs_base__peek_u32le__no_bounds_check(row + (4 * ((size_t)x)));

    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY: {
      uint8_t* palette = pb->private_impl.planes[3].ptr;
      return wuffs_base__peek_u32le__no_bounds_check(palette +
                                                     (4 * ((size_t)row[x])));
    }

      // Common formats above. Rarer formats below.

    case WUFFS_BASE__PIXEL_FORMAT__Y:
      return 0xFF000000 | (0x00010101 * ((uint32_t)(row[x])));
    case WUFFS_BASE__PIXEL_FORMAT__Y_16LE:
      return 0xFF000000 | (0x00010101 * ((uint32_t)(row[(2 * x) + 1])));
    case WUFFS_BASE__PIXEL_FORMAT__Y_16BE:
      return 0xFF000000 | (0x00010101 * ((uint32_t)(row[(2 * x) + 0])));

    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL: {
      uint8_t* palette = pb->private_impl.planes[3].ptr;
      return wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(
          wuffs_base__peek_u32le__no_bounds_check(palette +
                                                  (4 * ((size_t)row[x]))));
    }

    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
      return wuffs_base__color_u16_rgb_565__as__color_u32_argb_premul(
          wuffs_base__peek_u16le__no_bounds_check(row + (2 * ((size_t)x))));
    case WUFFS_BASE__PIXEL_FORMAT__BGR:
      return 0xFF000000 |
             wuffs_base__peek_u24le__no_bounds_check(row + (3 * ((size_t)x)));
    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
      return wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(
          wuffs_base__peek_u32le__no_bounds_check(row + (4 * ((size_t)x))));
    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
      return wuffs_base__color_u64_argb_nonpremul__as__color_u32_argb_premul(
          wuffs_base__peek_u64le__no_bounds_check(row + (8 * ((size_t)x))));
    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
      return 0xFF000000 |
             wuffs_base__peek_u32le__no_bounds_check(row + (4 * ((size_t)x)));

    case WUFFS_BASE__PIXEL_FORMAT__RGB:
      return wuffs_base__swap_u32_argb_abgr(
          0xFF000000 |
          wuffs_base__peek_u24le__no_bounds_check(row + (3 * ((size_t)x))));
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
      return wuffs_base__swap_u32_argb_abgr(
          wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(
              wuffs_base__peek_u32le__no_bounds_check(row +
                                                      (4 * ((size_t)x)))));
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
      return wuffs_base__swap_u32_argb_abgr(
          wuffs_base__peek_u32le__no_bounds_check(row + (4 * ((size_t)x))));
    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
      return wuffs_base__swap_u32_argb_abgr(
          0xFF000000 |
          wuffs_base__peek_u32le__no_bounds_check(row + (4 * ((size_t)x))));

    default:
      // TODO: support more formats.
      break;
  }

  return 0;
}

// --------

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_base__pixel_buffer__set_color_u32_at(
    wuffs_base__pixel_buffer* pb,
    uint32_t x,
    uint32_t y,
    wuffs_base__color_u32_argb_premul color) {
  if (!pb) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if ((x >= pb->pixcfg.private_impl.width) ||
      (y >= pb->pixcfg.private_impl.height)) {
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }

  if (wuffs_base__pixel_format__is_planar(&pb->pixcfg.private_impl.pixfmt)) {
    // TODO: support planar formats.
    return wuffs_base__make_status(wuffs_base__error__unsupported_option);
  }

  size_t stride = pb->private_impl.planes[0].stride;
  uint8_t* row = pb->private_impl.planes[0].ptr + (stride * ((size_t)y));

  switch (pb->pixcfg.private_impl.pixfmt.repr) {
    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
      wuffs_base__poke_u32le__no_bounds_check(row + (4 * ((size_t)x)), color);
      break;

      // Common formats above. Rarer formats below.

    case WUFFS_BASE__PIXEL_FORMAT__Y:
      wuffs_base__poke_u8__no_bounds_check(
          row + ((size_t)x),
          wuffs_base__color_u32_argb_premul__as__color_u8_gray(color));
      break;
    case WUFFS_BASE__PIXEL_FORMAT__Y_16LE:
      wuffs_base__poke_u16le__no_bounds_check(
          row + (2 * ((size_t)x)),
          wuffs_base__color_u32_argb_premul__as__color_u16_gray(color));
      break;
    case WUFFS_BASE__PIXEL_FORMAT__Y_16BE:
      wuffs_base__poke_u16be__no_bounds_check(
          row + (2 * ((size_t)x)),
          wuffs_base__color_u32_argb_premul__as__color_u16_gray(color));
      break;

    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY:
      wuffs_base__poke_u8__no_bounds_check(
          row + ((size_t)x), wuffs_base__pixel_palette__closest_element(
                                 wuffs_base__pixel_buffer__palette(pb),
                                 pb->pixcfg.private_impl.pixfmt, color));
      break;

    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
      wuffs_base__poke_u16le__no_bounds_check(
          row + (2 * ((size_t)x)),
          wuffs_base__color_u32_argb_premul__as__color_u16_rgb_565(color));
      break;
    case WUFFS_BASE__PIXEL_FORMAT__BGR:
      wuffs_base__poke_u24le__no_bounds_check(row + (3 * ((size_t)x)), color);
      break;
    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
      wuffs_base__poke_u32le__no_bounds_check(
          row + (4 * ((size_t)x)),
          wuffs_base__color_u32_argb_premul__as__color_u32_argb_nonpremul(
              color));
      break;
    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
      wuffs_base__poke_u64le__no_bounds_check(
          row + (8 * ((size_t)x)),
          wuffs_base__color_u32_argb_premul__as__color_u64_argb_nonpremul(
              color));
      break;

    case WUFFS_BASE__PIXEL_FORMAT__RGB:
      wuffs_base__poke_u24le__no_bounds_check(
          row + (3 * ((size_t)x)), wuffs_base__swap_u32_argb_abgr(color));
      break;
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
      wuffs_base__poke_u32le__no_bounds_check(
          row + (4 * ((size_t)x)),
          wuffs_base__color_u32_argb_premul__as__color_u32_argb_nonpremul(
              wuffs_base__swap_u32_argb_abgr(color)));
      break;
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
      wuffs_base__poke_u32le__no_bounds_check(
          row + (4 * ((size_t)x)), wuffs_base__swap_u32_argb_abgr(color));
      break;

    default:
      // TODO: support more formats.
      return wuffs_base__make_status(wuffs_base__error__unsupported_option);
  }

  return wuffs_base__make_status(NULL);
}

// --------

WUFFS_BASE__MAYBE_STATIC uint8_t  //
wuffs_base__pixel_palette__closest_element(
    wuffs_base__slice_u8 palette_slice,
    wuffs_base__pixel_format palette_format,
    wuffs_base__color_u32_argb_premul c) {
  size_t n = palette_slice.len / 4;
  if (n > 256) {
    n = 256;
  }
  size_t best_index = 0;
  uint64_t best_score = 0xFFFFFFFFFFFFFFFF;

  // Work in 16-bit color.
  uint32_t ca = 0x101 * (0xFF & (c >> 24));
  uint32_t cr = 0x101 * (0xFF & (c >> 16));
  uint32_t cg = 0x101 * (0xFF & (c >> 8));
  uint32_t cb = 0x101 * (0xFF & (c >> 0));

  switch (palette_format.repr) {
    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY: {
      bool nonpremul = palette_format.repr ==
                       WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL;

      size_t i;
      for (i = 0; i < n; i++) {
        // Work in 16-bit color.
        uint32_t pb = 0x101 * ((uint32_t)(palette_slice.ptr[(4 * i) + 0]));
        uint32_t pg = 0x101 * ((uint32_t)(palette_slice.ptr[(4 * i) + 1]));
        uint32_t pr = 0x101 * ((uint32_t)(palette_slice.ptr[(4 * i) + 2]));
        uint32_t pa = 0x101 * ((uint32_t)(palette_slice.ptr[(4 * i) + 3]));

        // Convert to premultiplied alpha.
        if (nonpremul && (pa != 0xFFFF)) {
          pb = (pb * pa) / 0xFFFF;
          pg = (pg * pa) / 0xFFFF;
          pr = (pr * pa) / 0xFFFF;
        }

        // These deltas are conceptually int32_t (signed) but after squaring,
        // it's equivalent to work in uint32_t (unsigned).
        pb -= cb;
        pg -= cg;
        pr -= cr;
        pa -= ca;
        uint64_t score = ((uint64_t)(pb * pb)) + ((uint64_t)(pg * pg)) +
                         ((uint64_t)(pr * pr)) + ((uint64_t)(pa * pa));
        if (best_score > score) {
          best_score = score;
          best_index = i;
        }
      }
      break;
    }
  }

  return (uint8_t)best_index;
}

// --------

static inline uint32_t  //
wuffs_base__composite_nonpremul_nonpremul_u32_axxx(uint32_t dst_nonpremul,
                                                   uint32_t src_nonpremul) {
  // Extract 16-bit color components.
  uint32_t sa = 0x101 * (0xFF & (src_nonpremul >> 24));
  uint32_t sr = 0x101 * (0xFF & (src_nonpremul >> 16));
  uint32_t sg = 0x101 * (0xFF & (src_nonpremul >> 8));
  uint32_t sb = 0x101 * (0xFF & (src_nonpremul >> 0));
  uint32_t da = 0x101 * (0xFF & (dst_nonpremul >> 24));
  uint32_t dr = 0x101 * (0xFF & (dst_nonpremul >> 16));
  uint32_t dg = 0x101 * (0xFF & (dst_nonpremul >> 8));
  uint32_t db = 0x101 * (0xFF & (dst_nonpremul >> 0));

  // Convert dst from nonpremul to premul.
  dr = (dr * da) / 0xFFFF;
  dg = (dg * da) / 0xFFFF;
  db = (db * da) / 0xFFFF;

  // Calculate the inverse of the src-alpha: how much of the dst to keep.
  uint32_t ia = 0xFFFF - sa;

  // Composite src (nonpremul) over dst (premul).
  da = sa + ((da * ia) / 0xFFFF);
  dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
  dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
  db = ((sb * sa) + (db * ia)) / 0xFFFF;

  // Convert dst from premul to nonpremul.
  if (da != 0) {
    dr = (dr * 0xFFFF) / da;
    dg = (dg * 0xFFFF) / da;
    db = (db * 0xFFFF) / da;
  }

  // Convert from 16-bit color to 8-bit color.
  da >>= 8;
  dr >>= 8;
  dg >>= 8;
  db >>= 8;

  // Combine components.
  return (db << 0) | (dg << 8) | (dr << 16) | (da << 24);
}

static inline uint64_t  //
wuffs_base__composite_nonpremul_nonpremul_u64_axxx(uint64_t dst_nonpremul,
                                                   uint64_t src_nonpremul) {
  // Extract components.
  uint64_t sa = 0xFFFF & (src_nonpremul >> 48);
  uint64_t sr = 0xFFFF & (src_nonpremul >> 32);
  uint64_t sg = 0xFFFF & (src_nonpremul >> 16);
  uint64_t sb = 0xFFFF & (src_nonpremul >> 0);
  uint64_t da = 0xFFFF & (dst_nonpremul >> 48);
  uint64_t dr = 0xFFFF & (dst_nonpremul >> 32);
  uint64_t dg = 0xFFFF & (dst_nonpremul >> 16);
  uint64_t db = 0xFFFF & (dst_nonpremul >> 0);

  // Convert dst from nonpremul to premul.
  dr = (dr * da) / 0xFFFF;
  dg = (dg * da) / 0xFFFF;
  db = (db * da) / 0xFFFF;

  // Calculate the inverse of the src-alpha: how much of the dst to keep.
  uint64_t ia = 0xFFFF - sa;

  // Composite src (nonpremul) over dst (premul).
  da = sa + ((da * ia) / 0xFFFF);
  dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
  dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
  db = ((sb * sa) + (db * ia)) / 0xFFFF;

  // Convert dst from premul to nonpremul.
  if (da != 0) {
    dr = (dr * 0xFFFF) / da;
    dg = (dg * 0xFFFF) / da;
    db = (db * 0xFFFF) / da;
  }

  // Combine components.
  return (db << 0) | (dg << 16) | (dr << 32) | (da << 48);
}

static inline uint32_t  //
wuffs_base__composite_nonpremul_premul_u32_axxx(uint32_t dst_nonpremul,
                                                uint32_t src_premul) {
  // Extract 16-bit color components.
  uint32_t sa = 0x101 * (0xFF & (src_premul >> 24));
  uint32_t sr = 0x101 * (0xFF & (src_premul >> 16));
  uint32_t sg = 0x101 * (0xFF & (src_premul >> 8));
  uint32_t sb = 0x101 * (0xFF & (src_premul >> 0));
  uint32_t da = 0x101 * (0xFF & (dst_nonpremul >> 24));
  uint32_t dr = 0x101 * (0xFF & (dst_nonpremul >> 16));
  uint32_t dg = 0x101 * (0xFF & (dst_nonpremul >> 8));
  uint32_t db = 0x101 * (0xFF & (dst_nonpremul >> 0));

  // Convert dst from nonpremul to premul.
  dr = (dr * da) / 0xFFFF;
  dg = (dg * da) / 0xFFFF;
  db = (db * da) / 0xFFFF;

  // Calculate the inverse of the src-alpha: how much of the dst to keep.
  uint32_t ia = 0xFFFF - sa;

  // Composite src (premul) over dst (premul).
  da = sa + ((da * ia) / 0xFFFF);
  dr = sr + ((dr * ia) / 0xFFFF);
  dg = sg + ((dg * ia) / 0xFFFF);
  db = sb + ((db * ia) / 0xFFFF);

  // Convert dst from premul to nonpremul.
  if (da != 0) {
    dr = (dr * 0xFFFF) / da;
    dg = (dg * 0xFFFF) / da;
    db = (db * 0xFFFF) / da;
  }

  // Convert from 16-bit color to 8-bit color.
  da >>= 8;
  dr >>= 8;
  dg >>= 8;
  db >>= 8;

  // Combine components.
  return (db << 0) | (dg << 8) | (dr << 16) | (da << 24);
}

static inline uint32_t  //
wuffs_base__composite_premul_nonpremul_u32_axxx(uint32_t dst_premul,
                                                uint32_t src_nonpremul) {
  // Extract 16-bit color components.
  uint32_t sa = 0x101 * (0xFF & (src_nonpremul >> 24));
  uint32_t sr = 0x101 * (0xFF & (src_nonpremul >> 16));
  uint32_t sg = 0x101 * (0xFF & (src_nonpremul >> 8));
  uint32_t sb = 0x101 * (0xFF & (src_nonpremul >> 0));
  uint32_t da = 0x101 * (0xFF & (dst_premul >> 24));
  uint32_t dr = 0x101 * (0xFF & (dst_premul >> 16));
  uint32_t dg = 0x101 * (0xFF & (dst_premul >> 8));
  uint32_t db = 0x101 * (0xFF & (dst_premul >> 0));

  // Calculate the inverse of the src-alpha: how much of the dst to keep.
  uint32_t ia = 0xFFFF - sa;

  // Composite src (nonpremul) over dst (premul).
  da = sa + ((da * ia) / 0xFFFF);
  dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
  dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
  db = ((sb * sa) + (db * ia)) / 0xFFFF;

  // Convert from 16-bit color to 8-bit color.
  da >>= 8;
  dr >>= 8;
  dg >>= 8;
  db >>= 8;

  // Combine components.
  return (db << 0) | (dg << 8) | (dr << 16) | (da << 24);
}

static inline uint64_t  //
wuffs_base__composite_premul_nonpremul_u64_axxx(uint64_t dst_premul,
                                                uint64_t src_nonpremul) {
  // Extract components.
  uint64_t sa = 0xFFFF & (src_nonpremul >> 48);
  uint64_t sr = 0xFFFF & (src_nonpremul >> 32);
  uint64_t sg = 0xFFFF & (src_nonpremul >> 16);
  uint64_t sb = 0xFFFF & (src_nonpremul >> 0);
  uint64_t da = 0xFFFF & (dst_premul >> 48);
  uint64_t dr = 0xFFFF & (dst_premul >> 32);
  uint64_t dg = 0xFFFF & (dst_premul >> 16);
  uint64_t db = 0xFFFF & (dst_premul >> 0);

  // Calculate the inverse of the src-alpha: how much of the dst to keep.
  uint64_t ia = 0xFFFF - sa;

  // Composite src (nonpremul) over dst (premul).
  da = sa + ((da * ia) / 0xFFFF);
  dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
  dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
  db = ((sb * sa) + (db * ia)) / 0xFFFF;

  // Combine components.
  return (db << 0) | (dg << 16) | (dr << 32) | (da << 48);
}

static inline uint32_t  //
wuffs_base__composite_premul_premul_u32_axxx(uint32_t dst_premul,
                                             uint32_t src_premul) {
  // Extract 16-bit color components.
  uint32_t sa = 0x101 * (0xFF & (src_premul >> 24));
  uint32_t sr = 0x101 * (0xFF & (src_premul >> 16));
  uint32_t sg = 0x101 * (0xFF & (src_premul >> 8));
  uint32_t sb = 0x101 * (0xFF & (src_premul >> 0));
  uint32_t da = 0x101 * (0xFF & (dst_premul >> 24));
  uint32_t dr = 0x101 * (0xFF & (dst_premul >> 16));
  uint32_t dg = 0x101 * (0xFF & (dst_premul >> 8));
  uint32_t db = 0x101 * (0xFF & (dst_premul >> 0));

  // Calculate the inverse of the src-alpha: how much of the dst to keep.
  uint32_t ia = 0xFFFF - sa;

  // Composite src (premul) over dst (premul).
  da = sa + ((da * ia) / 0xFFFF);
  dr = sr + ((dr * ia) / 0xFFFF);
  dg = sg + ((dg * ia) / 0xFFFF);
  db = sb + ((db * ia) / 0xFFFF);

  // Convert from 16-bit color to 8-bit color.
  da >>= 8;
  dr >>= 8;
  dg >>= 8;
  db >>= 8;

  // Combine components.
  return (db << 0) | (dg << 8) | (dr << 16) | (da << 24);
}

// --------

static uint64_t  //
wuffs_base__pixel_swizzler__squash_align4_bgr_565_8888(uint8_t* dst_ptr,
                                                       size_t dst_len,
                                                       const uint8_t* src_ptr,
                                                       size_t src_len,
                                                       bool nonpremul) {
  size_t len = (dst_len < src_len ? dst_len : src_len) / 4;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;

  size_t n = len;
  while (n--) {
    uint32_t argb = wuffs_base__peek_u32le__no_bounds_check(s);
    if (nonpremul) {
      argb =
          wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(argb);
    }
    uint32_t b5 = 0x1F & (argb >> (8 - 5));
    uint32_t g6 = 0x3F & (argb >> (16 - 6));
    uint32_t r5 = 0x1F & (argb >> (24 - 5));
    uint32_t alpha = argb & 0xFF000000;
    wuffs_base__poke_u32le__no_bounds_check(
        d, alpha | (r5 << 11) | (g6 << 5) | (b5 << 0));
    s += 4;
    d += 4;
  }
  return len;
}

// --------

static uint64_t  //
wuffs_base__pixel_swizzler__swap_rgb_bgr(uint8_t* dst_ptr,
                                         size_t dst_len,
                                         uint8_t* dst_palette_ptr,
                                         size_t dst_palette_len,
                                         const uint8_t* src_ptr,
                                         size_t src_len) {
  size_t len = (dst_len < src_len ? dst_len : src_len) / 3;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;

  size_t n = len;
  while (n--) {
    uint8_t b0 = s[0];
    uint8_t b1 = s[1];
    uint8_t b2 = s[2];
    d[0] = b2;
    d[1] = b1;
    d[2] = b0;
    s += 3;
    d += 3;
  }
  return len;
}

#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
#if defined(__GNUC__)
__attribute__((target("sse4.2")))
#endif
static uint64_t  //
wuffs_base__pixel_swizzler__swap_rgbx_bgrx__sse42(uint8_t* dst_ptr,
                                                  size_t dst_len,
                                                  uint8_t* dst_palette_ptr,
                                                  size_t dst_palette_len,
                                                  const uint8_t* src_ptr,
                                                  size_t src_len) {
  size_t len = (dst_len < src_len ? dst_len : src_len) / 4;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  __m128i shuffle = _mm_set_epi8(+0x0F, +0x0C, +0x0D, +0x0E,  //
                                 +0x0B, +0x08, +0x09, +0x0A,  //
                                 +0x07, +0x04, +0x05, +0x06,  //
                                 +0x03, +0x00, +0x01, +0x02);

  while (n >= 4) {
    __m128i x;
    x = _mm_lddqu_si128((const __m128i*)(const void*)s);
    x = _mm_shuffle_epi8(x, shuffle);
    _mm_storeu_si128((__m128i*)(void*)d, x);

    s += 4 * 4;
    d += 4 * 4;
    n -= 4;
  }

  while (n--) {
    uint8_t b0 = s[0];
    uint8_t b1 = s[1];
    uint8_t b2 = s[2];
    uint8_t b3 = s[3];
    d[0] = b2;
    d[1] = b1;
    d[2] = b0;
    d[3] = b3;
    s += 4;
    d += 4;
  }
  return len;
}
#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_64)

static uint64_t  //
wuffs_base__pixel_swizzler__swap_rgbx_bgrx(uint8_t* dst_ptr,
                                           size_t dst_len,
                                           uint8_t* dst_palette_ptr,
                                           size_t dst_palette_len,
                                           const uint8_t* src_ptr,
                                           size_t src_len) {
  size_t len = (dst_len < src_len ? dst_len : src_len) / 4;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;

  size_t n = len;
  while (n--) {
    uint8_t b0 = s[0];
    uint8_t b1 = s[1];
    uint8_t b2 = s[2];
    uint8_t b3 = s[3];
    d[0] = b2;
    d[1] = b1;
    d[2] = b0;
    d[3] = b3;
    s += 4;
    d += 4;
  }
  return len;
}

// --------

static uint64_t  //
wuffs_base__pixel_swizzler__squash_tight_4x8_4x16le(uint8_t* dst_ptr,
                                                    size_t dst_len,
                                                    uint8_t* dst_palette_ptr,
                                                    size_t dst_palette_len,
                                                    const uint8_t* src_ptr,
                                                    size_t src_len) {
  size_t dst_len4 = dst_len / 4;
  size_t src_len8 = src_len / 8;
  size_t len = (dst_len4 < src_len8) ? dst_len4 : src_len8;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;

  size_t n = len;
  while (n >= 1) {
    wuffs_base__poke_u32le__no_bounds_check(
        d + (0 * 4), wuffs_base__color_u64__as__color_u32(
                         wuffs_base__peek_u64le__no_bounds_check(s + (0 * 8))));

    s += 1 * 8;
    d += 1 * 4;
    n -= 1;
  }
  return len;
}

// --------

static uint64_t  //
wuffs_base__pixel_swizzler__copy_1_1(uint8_t* dst_ptr,
                                     size_t dst_len,
                                     uint8_t* dst_palette_ptr,
                                     size_t dst_palette_len,
                                     const uint8_t* src_ptr,
                                     size_t src_len) {
  size_t len = (dst_len < src_len) ? dst_len : src_len;
  if (len > 0) {
    memmove(dst_ptr, src_ptr, len);
  }
  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__copy_3_3(uint8_t* dst_ptr,
                                     size_t dst_len,
                                     uint8_t* dst_palette_ptr,
                                     size_t dst_palette_len,
                                     const uint8_t* src_ptr,
                                     size_t src_len) {
  size_t dst_len3 = dst_len / 3;
  size_t src_len3 = src_len / 3;
  size_t len = (dst_len3 < src_len3) ? dst_len3 : src_len3;
  if (len > 0) {
    memmove(dst_ptr, src_ptr, len * 3);
  }
  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__copy_4_4(uint8_t* dst_ptr,
                                     size_t dst_len,
                                     uint8_t* dst_palette_ptr,
                                     size_t dst_palette_len,
                                     const uint8_t* src_ptr,
                                     size_t src_len) {
  size_t dst_len4 = dst_len / 4;
  size_t src_len4 = src_len / 4;
  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
  if (len > 0) {
    memmove(dst_ptr, src_ptr, len * 4);
  }
  return len;
}

// --------

static uint64_t  //
wuffs_base__pixel_swizzler__bgr_565__bgr(uint8_t* dst_ptr,
                                         size_t dst_len,
                                         uint8_t* dst_palette_ptr,
                                         size_t dst_palette_len,
                                         const uint8_t* src_ptr,
                                         size_t src_len) {
  size_t dst_len2 = dst_len / 2;
  size_t src_len3 = src_len / 3;
  size_t len = (dst_len2 < src_len3) ? dst_len2 : src_len3;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    uint32_t b5 = s[0] >> 3;
    uint32_t g6 = s[1] >> 2;
    uint32_t r5 = s[2] >> 3;
    uint32_t rgb_565 = (r5 << 11) | (g6 << 5) | (b5 << 0);
    wuffs_base__poke_u16le__no_bounds_check(d + (0 * 2), (uint16_t)rgb_565);

    s += 1 * 3;
    d += 1 * 2;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgr_565__bgrx(uint8_t* dst_ptr,
                                          size_t dst_len,
                                          uint8_t* dst_palette_ptr,
                                          size_t dst_palette_len,
                                          const uint8_t* src_ptr,
                                          size_t src_len) {
  size_t dst_len2 = dst_len / 2;
  size_t src_len4 = src_len / 4;
  size_t len = (dst_len2 < src_len4) ? dst_len2 : src_len4;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    uint32_t b5 = s[0] >> 3;
    uint32_t g6 = s[1] >> 2;
    uint32_t r5 = s[2] >> 3;
    uint32_t rgb_565 = (r5 << 11) | (g6 << 5) | (b5 << 0);
    wuffs_base__poke_u16le__no_bounds_check(d + (0 * 2), (uint16_t)rgb_565);

    s += 1 * 4;
    d += 1 * 2;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgr_565__bgra_nonpremul__src(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  size_t dst_len2 = dst_len / 2;
  size_t src_len4 = src_len / 4;
  size_t len = (dst_len2 < src_len4) ? dst_len2 : src_len4;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    wuffs_base__poke_u16le__no_bounds_check(
        d + (0 * 2),
        wuffs_base__color_u32_argb_premul__as__color_u16_rgb_565(
            wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(
                wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4)))));

    s += 1 * 4;
    d += 1 * 2;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgr_565__bgra_nonpremul_4x16le__src(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  size_t dst_len2 = dst_len / 2;
  size_t src_len8 = src_len / 8;
  size_t len = (dst_len2 < src_len8) ? dst_len2 : src_len8;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    wuffs_base__poke_u16le__no_bounds_check(
        d + (0 * 2),
        wuffs_base__color_u32_argb_premul__as__color_u16_rgb_565(
            wuffs_base__color_u64_argb_nonpremul__as__color_u32_argb_premul(
                wuffs_base__peek_u64le__no_bounds_check(s + (0 * 8)))));

    s += 1 * 8;
    d += 1 * 2;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgr_565__bgra_nonpremul__src_over(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  size_t dst_len2 = dst_len / 2;
  size_t src_len4 = src_len / 4;
  size_t len = (dst_len2 < src_len4) ? dst_len2 : src_len4;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    // Extract 16-bit color components.
    uint32_t sa = 0x101 * ((uint32_t)s[3]);
    uint32_t sr = 0x101 * ((uint32_t)s[2]);
    uint32_t sg = 0x101 * ((uint32_t)s[1]);
    uint32_t sb = 0x101 * ((uint32_t)s[0]);

    // Convert from 565 color to 16-bit color.
    uint32_t old_rgb_565 = wuffs_base__peek_u16le__no_bounds_check(d + (0 * 2));
    uint32_t old_r5 = 0x1F & (old_rgb_565 >> 11);
    uint32_t dr = (0x8421 * old_r5) >> 4;
    uint32_t old_g6 = 0x3F & (old_rgb_565 >> 5);
    uint32_t dg = (0x1041 * old_g6) >> 2;
    uint32_t old_b5 = 0x1F & (old_rgb_565 >> 0);
    uint32_t db = (0x8421 * old_b5) >> 4;

    // Calculate the inverse of the src-alpha: how much of the dst to keep.
    uint32_t ia = 0xFFFF - sa;

    // Composite src (nonpremul) over dst (premul).
    dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
    dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
    db = ((sb * sa) + (db * ia)) / 0xFFFF;

    // Convert from 16-bit color to 565 color and combine the components.
    uint32_t new_r5 = 0x1F & (dr >> 11);
    uint32_t new_g6 = 0x3F & (dg >> 10);
    uint32_t new_b5 = 0x1F & (db >> 11);
    uint32_t new_rgb_565 = (new_r5 << 11) | (new_g6 << 5) | (new_b5 << 0);
    wuffs_base__poke_u16le__no_bounds_check(d + (0 * 2), (uint16_t)new_rgb_565);

    s += 1 * 4;
    d += 1 * 2;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgr_565__bgra_nonpremul_4x16le__src_over(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  size_t dst_len2 = dst_len / 2;
  size_t src_len8 = src_len / 8;
  size_t len = (dst_len2 < src_len8) ? dst_len2 : src_len8;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    // Extract 16-bit color components.
    uint32_t sa = ((uint32_t)wuffs_base__peek_u16le__no_bounds_check(s + 6));
    uint32_t sr = ((uint32_t)wuffs_base__peek_u16le__no_bounds_check(s + 4));
    uint32_t sg = ((uint32_t)wuffs_base__peek_u16le__no_bounds_check(s + 2));
    uint32_t sb = ((uint32_t)wuffs_base__peek_u16le__no_bounds_check(s + 0));

    // Convert from 565 color to 16-bit color.
    uint32_t old_rgb_565 = wuffs_base__peek_u16le__no_bounds_check(d + (0 * 2));
    uint32_t old_r5 = 0x1F & (old_rgb_565 >> 11);
    uint32_t dr = (0x8421 * old_r5) >> 4;
    uint32_t old_g6 = 0x3F & (old_rgb_565 >> 5);
    uint32_t dg = (0x1041 * old_g6) >> 2;
    uint32_t old_b5 = 0x1F & (old_rgb_565 >> 0);
    uint32_t db = (0x8421 * old_b5) >> 4;

    // Calculate the inverse of the src-alpha: how much of the dst to keep.
    uint32_t ia = 0xFFFF - sa;

    // Composite src (nonpremul) over dst (premul).
    dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
    dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
    db = ((sb * sa) + (db * ia)) / 0xFFFF;

    // Convert from 16-bit color to 565 color and combine the components.
    uint32_t new_r5 = 0x1F & (dr >> 11);
    uint32_t new_g6 = 0x3F & (dg >> 10);
    uint32_t new_b5 = 0x1F & (db >> 11);
    uint32_t new_rgb_565 = (new_r5 << 11) | (new_g6 << 5) | (new_b5 << 0);
    wuffs_base__poke_u16le__no_bounds_check(d + (0 * 2), (uint16_t)new_rgb_565);

    s += 1 * 8;
    d += 1 * 2;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgr_565__rgb(uint8_t* dst_ptr,
                                         size_t dst_len,
                                         uint8_t* dst_palette_ptr,
                                         size_t dst_palette_len,
                                         const uint8_t* src_ptr,
                                         size_t src_len) {
  size_t dst_len2 = dst_len / 2;
  size_t src_len3 = src_len / 3;
  size_t len = (dst_len2 < src_len3) ? dst_len2 : src_len3;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    uint32_t r5 = s[0] >> 3;
    uint32_t g6 = s[1] >> 2;
    uint32_t b5 = s[2] >> 3;
    uint32_t rgb_565 = (r5 << 11) | (g6 << 5) | (b5 << 0);
    wuffs_base__poke_u16le__no_bounds_check(d + (0 * 2), (uint16_t)rgb_565);

    s += 1 * 3;
    d += 1 * 2;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgr_565__rgba_nonpremul__src(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  size_t dst_len2 = dst_len / 2;
  size_t src_len4 = src_len / 4;
  size_t len = (dst_len2 < src_len4) ? dst_len2 : src_len4;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    wuffs_base__poke_u16le__no_bounds_check(
        d + (0 * 2),
        wuffs_base__color_u32_argb_premul__as__color_u16_rgb_565(
            wuffs_base__swap_u32_argb_abgr(
                wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(
                    wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4))))));

    s += 1 * 4;
    d += 1 * 2;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgr_565__rgba_nonpremul__src_over(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  size_t dst_len2 = dst_len / 2;
  size_t src_len4 = src_len / 4;
  size_t len = (dst_len2 < src_len4) ? dst_len2 : src_len4;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    // Extract 16-bit color components.
    uint32_t sa = 0x101 * ((uint32_t)s[3]);
    uint32_t sb = 0x101 * ((uint32_t)s[2]);
    uint32_t sg = 0x101 * ((uint32_t)s[1]);
    uint32_t sr = 0x101 * ((uint32_t)s[0]);

    // Convert from 565 color to 16-bit color.
    uint32_t old_rgb_565 = wuffs_base__peek_u16le__no_bounds_check(d + (0 * 2));
    uint32_t old_r5 = 0x1F & (old_rgb_565 >> 11);
    uint32_t dr = (0x8421 * old_r5) >> 4;
    uint32_t old_g6 = 0x3F & (old_rgb_565 >> 5);
    uint32_t dg = (0x1041 * old_g6) >> 2;
    uint32_t old_b5 = 0x1F & (old_rgb_565 >> 0);
    uint32_t db = (0x8421 * old_b5) >> 4;

    // Calculate the inverse of the src-alpha: how much of the dst to keep.
    uint32_t ia = 0xFFFF - sa;

    // Composite src (nonpremul) over dst (premul).
    dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
    dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
    db = ((sb * sa) + (db * ia)) / 0xFFFF;

    // Convert from 16-bit color to 565 color and combine the components.
    uint32_t new_r5 = 0x1F & (dr >> 11);
    uint32_t new_g6 = 0x3F & (dg >> 10);
    uint32_t new_b5 = 0x1F & (db >> 11);
    uint32_t new_rgb_565 = (new_r5 << 11) | (new_g6 << 5) | (new_b5 << 0);
    wuffs_base__poke_u16le__no_bounds_check(d + (0 * 2), (uint16_t)new_rgb_565);

    s += 1 * 4;
    d += 1 * 2;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgr_565__y(uint8_t* dst_ptr,
                                       size_t dst_len,
                                       uint8_t* dst_palette_ptr,
                                       size_t dst_palette_len,
                                       const uint8_t* src_ptr,
                                       size_t src_len) {
  size_t dst_len2 = dst_len / 2;
  size_t len = (dst_len2 < src_len) ? dst_len2 : src_len;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    uint32_t y5 = s[0] >> 3;
    uint32_t y6 = s[0] >> 2;
    uint32_t rgb_565 = (y5 << 11) | (y6 << 5) | (y5 << 0);
    wuffs_base__poke_u16le__no_bounds_check(d + (0 * 2), (uint16_t)rgb_565);

    s += 1 * 1;
    d += 1 * 2;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgr_565__y_16be(uint8_t* dst_ptr,
                                            size_t dst_len,
                                            uint8_t* dst_palette_ptr,
                                            size_t dst_palette_len,
                                            const uint8_t* src_ptr,
                                            size_t src_len) {
  size_t dst_len2 = dst_len / 2;
  size_t src_len2 = src_len / 2;
  size_t len = (dst_len2 < src_len2) ? dst_len2 : src_len2;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    uint32_t y5 = s[0] >> 3;
    uint32_t y6 = s[0] >> 2;
    uint32_t rgb_565 = (y5 << 11) | (y6 << 5) | (y5 << 0);
    wuffs_base__poke_u16le__no_bounds_check(d + (0 * 2), (uint16_t)rgb_565);

    s += 1 * 2;
    d += 1 * 2;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgr_565__index__src(uint8_t* dst_ptr,
                                                size_t dst_len,
                                                uint8_t* dst_palette_ptr,
                                                size_t dst_palette_len,
                                                const uint8_t* src_ptr,
                                                size_t src_len) {
  if (dst_palette_len != 1024) {
    return 0;
  }
  size_t dst_len2 = dst_len / 2;
  size_t len = (dst_len2 < src_len) ? dst_len2 : src_len;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  const size_t loop_unroll_count = 4;

  while (n >= loop_unroll_count) {
    wuffs_base__poke_u16le__no_bounds_check(
        d + (0 * 2), wuffs_base__peek_u16le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[0] * 4)));
    wuffs_base__poke_u16le__no_bounds_check(
        d + (1 * 2), wuffs_base__peek_u16le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[1] * 4)));
    wuffs_base__poke_u16le__no_bounds_check(
        d + (2 * 2), wuffs_base__peek_u16le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[2] * 4)));
    wuffs_base__poke_u16le__no_bounds_check(
        d + (3 * 2), wuffs_base__peek_u16le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[3] * 4)));

    s += loop_unroll_count * 1;
    d += loop_unroll_count * 2;
    n -= loop_unroll_count;
  }

  while (n >= 1) {
    wuffs_base__poke_u16le__no_bounds_check(
        d + (0 * 2), wuffs_base__peek_u16le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[0] * 4)));

    s += 1 * 1;
    d += 1 * 2;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgr_565__index_bgra_nonpremul__src_over(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  if (dst_palette_len != 1024) {
    return 0;
  }
  size_t dst_len2 = dst_len / 2;
  size_t len = (dst_len2 < src_len) ? dst_len2 : src_len;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    uint32_t d0 = wuffs_base__color_u16_rgb_565__as__color_u32_argb_premul(
        wuffs_base__peek_u16le__no_bounds_check(d + (0 * 2)));
    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[0] * 4));
    wuffs_base__poke_u16le__no_bounds_check(
        d + (0 * 2),
        wuffs_base__color_u32_argb_premul__as__color_u16_rgb_565(
            wuffs_base__composite_premul_nonpremul_u32_axxx(d0, s0)));

    s += 1 * 1;
    d += 1 * 2;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgr_565__index_binary_alpha__src_over(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  if (dst_palette_len != 1024) {
    return 0;
  }
  size_t dst_len2 = dst_len / 2;
  size_t len = (dst_len2 < src_len) ? dst_len2 : src_len;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[0] * 4));
    if (s0) {
      wuffs_base__poke_u16le__no_bounds_check(d + (0 * 2), (uint16_t)s0);
    }

    s += 1 * 1;
    d += 1 * 2;
    n -= 1;
  }

  return len;
}

// --------

static uint64_t  //
wuffs_base__pixel_swizzler__bgr__bgra_nonpremul__src(uint8_t* dst_ptr,
                                                     size_t dst_len,
                                                     uint8_t* dst_palette_ptr,
                                                     size_t dst_palette_len,
                                                     const uint8_t* src_ptr,
                                                     size_t src_len) {
  size_t dst_len3 = dst_len / 3;
  size_t src_len4 = src_len / 4;
  size_t len = (dst_len3 < src_len4) ? dst_len3 : src_len4;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    uint32_t s0 =
        wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(
            wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4)));
    wuffs_base__poke_u24le__no_bounds_check(d + (0 * 3), s0);

    s += 1 * 4;
    d += 1 * 3;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgr__bgra_nonpremul_4x16le__src(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  size_t dst_len3 = dst_len / 3;
  size_t src_len8 = src_len / 8;
  size_t len = (dst_len3 < src_len8) ? dst_len3 : src_len8;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    uint32_t s0 =
        wuffs_base__color_u64_argb_nonpremul__as__color_u32_argb_premul(
            wuffs_base__peek_u64le__no_bounds_check(s + (0 * 8)));
    wuffs_base__poke_u24le__no_bounds_check(d + (0 * 3), s0);

    s += 1 * 8;
    d += 1 * 3;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgr__bgra_nonpremul__src_over(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  size_t dst_len3 = dst_len / 3;
  size_t src_len4 = src_len / 4;
  size_t len = (dst_len3 < src_len4) ? dst_len3 : src_len4;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    // Extract 16-bit color components.
    uint32_t sa = 0x101 * ((uint32_t)s[3]);
    uint32_t sr = 0x101 * ((uint32_t)s[2]);
    uint32_t sg = 0x101 * ((uint32_t)s[1]);
    uint32_t sb = 0x101 * ((uint32_t)s[0]);
    uint32_t dr = 0x101 * ((uint32_t)d[2]);
    uint32_t dg = 0x101 * ((uint32_t)d[1]);
    uint32_t db = 0x101 * ((uint32_t)d[0]);

    // Calculate the inverse of the src-alpha: how much of the dst to keep.
    uint32_t ia = 0xFFFF - sa;

    // Composite src (nonpremul) over dst (premul).
    dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
    dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
    db = ((sb * sa) + (db * ia)) / 0xFFFF;

    // Convert from 16-bit color to 8-bit color.
    d[0] = (uint8_t)(db >> 8);
    d[1] = (uint8_t)(dg >> 8);
    d[2] = (uint8_t)(dr >> 8);

    s += 1 * 4;
    d += 1 * 3;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgr__bgra_nonpremul_4x16le__src_over(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  size_t dst_len3 = dst_len / 3;
  size_t src_len8 = src_len / 8;
  size_t len = (dst_len3 < src_len8) ? dst_len3 : src_len8;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    // Extract 16-bit color components.
    uint32_t sa = ((uint32_t)wuffs_base__peek_u16le__no_bounds_check(s + 6));
    uint32_t sr = ((uint32_t)wuffs_base__peek_u16le__no_bounds_check(s + 4));
    uint32_t sg = ((uint32_t)wuffs_base__peek_u16le__no_bounds_check(s + 2));
    uint32_t sb = ((uint32_t)wuffs_base__peek_u16le__no_bounds_check(s + 0));
    uint32_t dr = 0x101 * ((uint32_t)d[2]);
    uint32_t dg = 0x101 * ((uint32_t)d[1]);
    uint32_t db = 0x101 * ((uint32_t)d[0]);

    // Calculate the inverse of the src-alpha: how much of the dst to keep.
    uint32_t ia = 0xFFFF - sa;

    // Composite src (nonpremul) over dst (premul).
    dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
    dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
    db = ((sb * sa) + (db * ia)) / 0xFFFF;

    // Convert from 16-bit color to 8-bit color.
    d[0] = (uint8_t)(db >> 8);
    d[1] = (uint8_t)(dg >> 8);
    d[2] = (uint8_t)(dr >> 8);

    s += 1 * 8;
    d += 1 * 3;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgr__rgba_nonpremul__src(uint8_t* dst_ptr,
                                                     size_t dst_len,
                                                     uint8_t* dst_palette_ptr,
                                                     size_t dst_palette_len,
                                                     const uint8_t* src_ptr,
                                                     size_t src_len) {
  size_t dst_len3 = dst_len / 3;
  size_t src_len4 = src_len / 4;
  size_t len = (dst_len3 < src_len4) ? dst_len3 : src_len4;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    uint32_t s0 = wuffs_base__swap_u32_argb_abgr(
        wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(
            wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4))));
    wuffs_base__poke_u24le__no_bounds_check(d + (0 * 3), s0);

    s += 1 * 4;
    d += 1 * 3;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgr__rgba_nonpremul__src_over(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  size_t dst_len3 = dst_len / 3;
  size_t src_len4 = src_len / 4;
  size_t len = (dst_len3 < src_len4) ? dst_len3 : src_len4;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    // Extract 16-bit color components.
    uint32_t sa = 0x101 * ((uint32_t)s[3]);
    uint32_t sb = 0x101 * ((uint32_t)s[2]);
    uint32_t sg = 0x101 * ((uint32_t)s[1]);
    uint32_t sr = 0x101 * ((uint32_t)s[0]);
    uint32_t dr = 0x101 * ((uint32_t)d[2]);
    uint32_t dg = 0x101 * ((uint32_t)d[1]);
    uint32_t db = 0x101 * ((uint32_t)d[0]);

    // Calculate the inverse of the src-alpha: how much of the dst to keep.
    uint32_t ia = 0xFFFF - sa;

    // Composite src (nonpremul) over dst (premul).
    dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
    dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
    db = ((sb * sa) + (db * ia)) / 0xFFFF;

    // Convert from 16-bit color to 8-bit color.
    d[0] = (uint8_t)(db >> 8);
    d[1] = (uint8_t)(dg >> 8);
    d[2] = (uint8_t)(dr >> 8);

    s += 1 * 4;
    d += 1 * 3;
    n -= 1;
  }

  return len;
}

// --------

static uint64_t  //
wuffs_base__pixel_swizzler__bgra_nonpremul__bgra_nonpremul__src_over(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  size_t dst_len4 = dst_len / 4;
  size_t src_len4 = src_len / 4;
  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  while (n >= 1) {
    uint32_t d0 = wuffs_base__peek_u32le__no_bounds_check(d + (0 * 4));
    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4));
    wuffs_base__poke_u32le__no_bounds_check(
        d + (0 * 4),
        wuffs_base__composite_nonpremul_nonpremul_u32_axxx(d0, s0));

    s += 1 * 4;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgra_nonpremul__bgra_nonpremul_4x16le__src_over(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  size_t dst_len4 = dst_len / 4;
  size_t src_len8 = src_len / 8;
  size_t len = (dst_len4 < src_len8) ? dst_len4 : src_len8;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  while (n >= 1) {
    uint64_t d0 = wuffs_base__color_u32__as__color_u64(
        wuffs_base__peek_u32le__no_bounds_check(d + (0 * 4)));
    uint64_t s0 = wuffs_base__peek_u64le__no_bounds_check(s + (0 * 8));
    wuffs_base__poke_u32le__no_bounds_check(
        d + (0 * 4),
        wuffs_base__color_u64__as__color_u32(
            wuffs_base__composite_nonpremul_nonpremul_u64_axxx(d0, s0)));

    s += 1 * 8;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgra_nonpremul__index_bgra_nonpremul__src_over(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  if (dst_palette_len != 1024) {
    return 0;
  }
  size_t dst_len4 = dst_len / 4;
  size_t len = (dst_len4 < src_len) ? dst_len4 : src_len;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    uint32_t d0 = wuffs_base__peek_u32le__no_bounds_check(d + (0 * 4));
    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[0] * 4));
    wuffs_base__poke_u32le__no_bounds_check(
        d + (0 * 4),
        wuffs_base__composite_nonpremul_nonpremul_u32_axxx(d0, s0));

    s += 1 * 1;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgra_nonpremul__rgba_nonpremul__src_over(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  size_t dst_len4 = dst_len / 4;
  size_t src_len4 = src_len / 4;
  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  while (n >= 1) {
    uint32_t d0 = wuffs_base__peek_u32le__no_bounds_check(d + (0 * 4));
    uint32_t s0 = wuffs_base__swap_u32_argb_abgr(
        wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4)));
    wuffs_base__poke_u32le__no_bounds_check(
        d + (0 * 4),
        wuffs_base__composite_nonpremul_nonpremul_u32_axxx(d0, s0));

    s += 1 * 4;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}

// --------

static uint64_t  //
wuffs_base__pixel_swizzler__bgra_premul__bgra_nonpremul__src(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  size_t dst_len4 = dst_len / 4;
  size_t src_len4 = src_len / 4;
  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4));
    wuffs_base__poke_u32le__no_bounds_check(
        d + (0 * 4),
        wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(s0));

    s += 1 * 4;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgra_premul__bgra_nonpremul_4x16le__src(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  size_t dst_len4 = dst_len / 4;
  size_t src_len8 = src_len / 8;
  size_t len = (dst_len4 < src_len8) ? dst_len4 : src_len8;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    uint64_t s0 = wuffs_base__peek_u64le__no_bounds_check(s + (0 * 8));
    wuffs_base__poke_u32le__no_bounds_check(
        d + (0 * 4),
        wuffs_base__color_u64_argb_nonpremul__as__color_u32_argb_premul(s0));

    s += 1 * 8;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgra_premul__bgra_nonpremul__src_over(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  size_t dst_len4 = dst_len / 4;
  size_t src_len4 = src_len / 4;
  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    uint32_t d0 = wuffs_base__peek_u32le__no_bounds_check(d + (0 * 4));
    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4));
    wuffs_base__poke_u32le__no_bounds_check(
        d + (0 * 4), wuffs_base__composite_premul_nonpremul_u32_axxx(d0, s0));

    s += 1 * 4;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgra_premul__bgra_nonpremul_4x16le__src_over(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  size_t dst_len4 = dst_len / 4;
  size_t src_len8 = src_len / 8;
  size_t len = (dst_len4 < src_len8) ? dst_len4 : src_len8;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    uint64_t d0 = wuffs_base__color_u32__as__color_u64(
        wuffs_base__peek_u32le__no_bounds_check(d + (0 * 4)));
    uint64_t s0 = wuffs_base__peek_u64le__no_bounds_check(s + (0 * 8));
    wuffs_base__poke_u32le__no_bounds_check(
        d + (0 * 4),
        wuffs_base__color_u64__as__color_u32(
            wuffs_base__composite_premul_nonpremul_u64_axxx(d0, s0)));

    s += 1 * 8;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgra_premul__index_bgra_nonpremul__src_over(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  if (dst_palette_len != 1024) {
    return 0;
  }
  size_t dst_len4 = dst_len / 4;
  size_t len = (dst_len4 < src_len) ? dst_len4 : src_len;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    uint32_t d0 = wuffs_base__peek_u32le__no_bounds_check(d + (0 * 4));
    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[0] * 4));
    wuffs_base__poke_u32le__no_bounds_check(
        d + (0 * 4), wuffs_base__composite_premul_nonpremul_u32_axxx(d0, s0));

    s += 1 * 1;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgra_premul__rgba_nonpremul__src(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  size_t dst_len4 = dst_len / 4;
  size_t src_len4 = src_len / 4;
  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    uint32_t s0 = wuffs_base__swap_u32_argb_abgr(
        wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4)));
    wuffs_base__poke_u32le__no_bounds_check(
        d + (0 * 4),
        wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(s0));

    s += 1 * 4;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgra_premul__rgba_nonpremul__src_over(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  size_t dst_len4 = dst_len / 4;
  size_t src_len4 = src_len / 4;
  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    uint32_t d0 = wuffs_base__peek_u32le__no_bounds_check(d + (0 * 4));
    uint32_t s0 = wuffs_base__swap_u32_argb_abgr(
        wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4)));
    wuffs_base__poke_u32le__no_bounds_check(
        d + (0 * 4), wuffs_base__composite_premul_nonpremul_u32_axxx(d0, s0));

    s += 1 * 4;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}

// --------

static uint64_t  //
wuffs_base__pixel_swizzler__bgrw__bgr(uint8_t* dst_ptr,
                                      size_t dst_len,
                                      uint8_t* dst_palette_ptr,
                                      size_t dst_palette_len,
                                      const uint8_t* src_ptr,
                                      size_t src_len) {
  size_t dst_len4 = dst_len / 4;
  size_t src_len3 = src_len / 3;
  size_t len = (dst_len4 < src_len3) ? dst_len4 : src_len3;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    wuffs_base__poke_u32le__no_bounds_check(
        d + (0 * 4),
        0xFF000000 | wuffs_base__peek_u24le__no_bounds_check(s + (0 * 3)));

    s += 1 * 3;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__bgrw__bgrx(uint8_t* dst_ptr,
                                       size_t dst_len,
                                       uint8_t* dst_palette_ptr,
                                       size_t dst_palette_len,
                                       const uint8_t* src_ptr,
                                       size_t src_len) {
  size_t dst_len4 = dst_len / 4;
  size_t src_len4 = src_len / 4;
  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    wuffs_base__poke_u32le__no_bounds_check(
        d + (0 * 4),
        0xFF000000 | wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4)));

    s += 1 * 4;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}

#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
#if defined(__GNUC__)
__attribute__((target("sse4.2")))
#endif
static uint64_t  //
wuffs_base__pixel_swizzler__bgrw__rgb__sse42(uint8_t* dst_ptr,
                                             size_t dst_len,
                                             uint8_t* dst_palette_ptr,
                                             size_t dst_palette_len,
                                             const uint8_t* src_ptr,
                                             size_t src_len) {
  size_t dst_len4 = dst_len / 4;
  size_t src_len3 = src_len / 3;
  size_t len = (dst_len4 < src_len3) ? dst_len4 : src_len3;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  __m128i shuffle = _mm_set_epi8(+0x00, +0x09, +0x0A, +0x0B,  //
                                 +0x00, +0x06, +0x07, +0x08,  //
                                 +0x00, +0x03, +0x04, +0x05,  //
                                 +0x00, +0x00, +0x01, +0x02);
  __m128i or_ff = _mm_set_epi8(-0x01, +0x00, +0x00, +0x00,  //
                               -0x01, +0x00, +0x00, +0x00,  //
                               -0x01, +0x00, +0x00, +0x00,  //
                               -0x01, +0x00, +0x00, +0x00);

  while (n >= 6) {
    __m128i x;
    x = _mm_lddqu_si128((const __m128i*)(const void*)s);
    x = _mm_shuffle_epi8(x, shuffle);
    x = _mm_or_si128(x, or_ff);
    _mm_storeu_si128((__m128i*)(void*)d, x);

    s += 4 * 3;
    d += 4 * 4;
    n -= 4;
  }

  while (n >= 1) {
    uint8_t b0 = s[0];
    uint8_t b1 = s[1];
    uint8_t b2 = s[2];
    d[0] = b2;
    d[1] = b1;
    d[2] = b0;
    d[3] = 0xFF;

    s += 1 * 3;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}
#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_64)

static uint64_t  //
wuffs_base__pixel_swizzler__bgrw__rgb(uint8_t* dst_ptr,
                                      size_t dst_len,
                                      uint8_t* dst_palette_ptr,
                                      size_t dst_palette_len,
                                      const uint8_t* src_ptr,
                                      size_t src_len) {
  size_t dst_len4 = dst_len / 4;
  size_t src_len3 = src_len / 3;
  size_t len = (dst_len4 < src_len3) ? dst_len4 : src_len3;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  while (n >= 1) {
    uint8_t b0 = s[0];
    uint8_t b1 = s[1];
    uint8_t b2 = s[2];
    d[0] = b2;
    d[1] = b1;
    d[2] = b0;
    d[3] = 0xFF;

    s += 1 * 3;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}

// --------

static uint64_t  //
wuffs_base__pixel_swizzler__xxx__index__src(uint8_t* dst_ptr,
                                            size_t dst_len,
                                            uint8_t* dst_palette_ptr,
                                            size_t dst_palette_len,
                                            const uint8_t* src_ptr,
                                            size_t src_len) {
  if (dst_palette_len != 1024) {
    return 0;
  }
  size_t dst_len3 = dst_len / 3;
  size_t len = (dst_len3 < src_len) ? dst_len3 : src_len;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  const size_t loop_unroll_count = 4;

  // The comparison in the while condition is ">", not ">=", because with
  // ">=", the last 4-byte store could write past the end of the dst slice.
  //
  // Each 4-byte store writes one too many bytes, but a subsequent store
  // will overwrite that with the correct byte. There is always another
  // store, whether a 4-byte store in this loop or a 1-byte store in the
  // next loop.
  while (n > loop_unroll_count) {
    wuffs_base__poke_u32le__no_bounds_check(
        d + (0 * 3), wuffs_base__peek_u32le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[0] * 4)));
    wuffs_base__poke_u32le__no_bounds_check(
        d + (1 * 3), wuffs_base__peek_u32le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[1] * 4)));
    wuffs_base__poke_u32le__no_bounds_check(
        d + (2 * 3), wuffs_base__peek_u32le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[2] * 4)));
    wuffs_base__poke_u32le__no_bounds_check(
        d + (3 * 3), wuffs_base__peek_u32le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[3] * 4)));

    s += loop_unroll_count * 1;
    d += loop_unroll_count * 3;
    n -= loop_unroll_count;
  }

  while (n >= 1) {
    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[0] * 4));
    wuffs_base__poke_u24le__no_bounds_check(d + (0 * 3), s0);

    s += 1 * 1;
    d += 1 * 3;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__xxx__index_bgra_nonpremul__src_over(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  if (dst_palette_len != 1024) {
    return 0;
  }
  size_t dst_len3 = dst_len / 3;
  size_t len = (dst_len3 < src_len) ? dst_len3 : src_len;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    uint32_t d0 =
        wuffs_base__peek_u24le__no_bounds_check(d + (0 * 3)) | 0xFF000000;
    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[0] * 4));
    wuffs_base__poke_u24le__no_bounds_check(
        d + (0 * 3), wuffs_base__composite_premul_nonpremul_u32_axxx(d0, s0));

    s += 1 * 1;
    d += 1 * 3;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__xxx__index_binary_alpha__src_over(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  if (dst_palette_len != 1024) {
    return 0;
  }
  size_t dst_len3 = dst_len / 3;
  size_t len = (dst_len3 < src_len) ? dst_len3 : src_len;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  const size_t loop_unroll_count = 4;

  while (n >= loop_unroll_count) {
    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[0] * 4));
    if (s0) {
      wuffs_base__poke_u24le__no_bounds_check(d + (0 * 3), s0);
    }
    uint32_t s1 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[1] * 4));
    if (s1) {
      wuffs_base__poke_u24le__no_bounds_check(d + (1 * 3), s1);
    }
    uint32_t s2 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[2] * 4));
    if (s2) {
      wuffs_base__poke_u24le__no_bounds_check(d + (2 * 3), s2);
    }
    uint32_t s3 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[3] * 4));
    if (s3) {
      wuffs_base__poke_u24le__no_bounds_check(d + (3 * 3), s3);
    }

    s += loop_unroll_count * 1;
    d += loop_unroll_count * 3;
    n -= loop_unroll_count;
  }

  while (n >= 1) {
    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[0] * 4));
    if (s0) {
      wuffs_base__poke_u24le__no_bounds_check(d + (0 * 3), s0);
    }

    s += 1 * 1;
    d += 1 * 3;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__xxx__xxxx(uint8_t* dst_ptr,
                                      size_t dst_len,
                                      uint8_t* dst_palette_ptr,
                                      size_t dst_palette_len,
                                      const uint8_t* src_ptr,
                                      size_t src_len) {
  size_t dst_len3 = dst_len / 3;
  size_t src_len4 = src_len / 4;
  size_t len = (dst_len3 < src_len4) ? dst_len3 : src_len4;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    wuffs_base__poke_u24le__no_bounds_check(
        d + (0 * 3), wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4)));

    s += 1 * 4;
    d += 1 * 3;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__xxx__y(uint8_t* dst_ptr,
                                   size_t dst_len,
                                   uint8_t* dst_palette_ptr,
                                   size_t dst_palette_len,
                                   const uint8_t* src_ptr,
                                   size_t src_len) {
  size_t dst_len3 = dst_len / 3;
  size_t len = (dst_len3 < src_len) ? dst_len3 : src_len;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    uint8_t s0 = s[0];
    d[0] = s0;
    d[1] = s0;
    d[2] = s0;

    s += 1 * 1;
    d += 1 * 3;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__xxx__y_16be(uint8_t* dst_ptr,
                                        size_t dst_len,
                                        uint8_t* dst_palette_ptr,
                                        size_t dst_palette_len,
                                        const uint8_t* src_ptr,
                                        size_t src_len) {
  size_t dst_len3 = dst_len / 3;
  size_t src_len2 = src_len / 2;
  size_t len = (dst_len3 < src_len2) ? dst_len3 : src_len2;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  // TODO: unroll.

  while (n >= 1) {
    uint8_t s0 = s[0];
    d[0] = s0;
    d[1] = s0;
    d[2] = s0;

    s += 1 * 2;
    d += 1 * 3;
    n -= 1;
  }

  return len;
}

// --------

static uint64_t  //
wuffs_base__pixel_swizzler__xxxx__index__src(uint8_t* dst_ptr,
                                             size_t dst_len,
                                             uint8_t* dst_palette_ptr,
                                             size_t dst_palette_len,
                                             const uint8_t* src_ptr,
                                             size_t src_len) {
  if (dst_palette_len != 1024) {
    return 0;
  }
  size_t dst_len4 = dst_len / 4;
  size_t len = (dst_len4 < src_len) ? dst_len4 : src_len;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  const size_t loop_unroll_count = 4;

  while (n >= loop_unroll_count) {
    wuffs_base__poke_u32le__no_bounds_check(
        d + (0 * 4), wuffs_base__peek_u32le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[0] * 4)));
    wuffs_base__poke_u32le__no_bounds_check(
        d + (1 * 4), wuffs_base__peek_u32le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[1] * 4)));
    wuffs_base__poke_u32le__no_bounds_check(
        d + (2 * 4), wuffs_base__peek_u32le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[2] * 4)));
    wuffs_base__poke_u32le__no_bounds_check(
        d + (3 * 4), wuffs_base__peek_u32le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[3] * 4)));

    s += loop_unroll_count * 1;
    d += loop_unroll_count * 4;
    n -= loop_unroll_count;
  }

  while (n >= 1) {
    wuffs_base__poke_u32le__no_bounds_check(
        d + (0 * 4), wuffs_base__peek_u32le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[0] * 4)));

    s += 1 * 1;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__xxxx__index_binary_alpha__src_over(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    const uint8_t* src_ptr,
    size_t src_len) {
  if (dst_palette_len != 1024) {
    return 0;
  }
  size_t dst_len4 = dst_len / 4;
  size_t len = (dst_len4 < src_len) ? dst_len4 : src_len;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  const size_t loop_unroll_count = 4;

  while (n >= loop_unroll_count) {
    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[0] * 4));
    if (s0) {
      wuffs_base__poke_u32le__no_bounds_check(d + (0 * 4), s0);
    }
    uint32_t s1 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[1] * 4));
    if (s1) {
      wuffs_base__poke_u32le__no_bounds_check(d + (1 * 4), s1);
    }
    uint32_t s2 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[2] * 4));
    if (s2) {
      wuffs_base__poke_u32le__no_bounds_check(d + (2 * 4), s2);
    }
    uint32_t s3 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[3] * 4));
    if (s3) {
      wuffs_base__poke_u32le__no_bounds_check(d + (3 * 4), s3);
    }

    s += loop_unroll_count * 1;
    d += loop_unroll_count * 4;
    n -= loop_unroll_count;
  }

  while (n >= 1) {
    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[0] * 4));
    if (s0) {
      wuffs_base__poke_u32le__no_bounds_check(d + (0 * 4), s0);
    }

    s += 1 * 1;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}

#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
#if defined(__GNUC__)
__attribute__((target("sse4.2")))
#endif
static uint64_t  //
wuffs_base__pixel_swizzler__xxxx__y__sse42(uint8_t* dst_ptr,
                                           size_t dst_len,
                                           uint8_t* dst_palette_ptr,
                                           size_t dst_palette_len,
                                           const uint8_t* src_ptr,
                                           size_t src_len) {
  size_t dst_len4 = dst_len / 4;
  size_t len = (dst_len4 < src_len) ? dst_len4 : src_len;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  __m128i shuffle = _mm_set_epi8(+0x03, +0x03, +0x03, +0x03,  //
                                 +0x02, +0x02, +0x02, +0x02,  //
                                 +0x01, +0x01, +0x01, +0x01,  //
                                 +0x00, +0x00, +0x00, +0x00);
  __m128i or_ff = _mm_set_epi8(-0x01, +0x00, +0x00, +0x00,  //
                               -0x01, +0x00, +0x00, +0x00,  //
                               -0x01, +0x00, +0x00, +0x00,  //
                               -0x01, +0x00, +0x00, +0x00);

  while (n >= 4) {
    __m128i x;
    x = _mm_cvtsi32_si128((int)(wuffs_base__peek_u32le__no_bounds_check(s)));
    x = _mm_shuffle_epi8(x, shuffle);
    x = _mm_or_si128(x, or_ff);
    _mm_storeu_si128((__m128i*)(void*)d, x);

    s += 4 * 1;
    d += 4 * 4;
    n -= 4;
  }

  while (n >= 1) {
    wuffs_base__poke_u32le__no_bounds_check(
        d + (0 * 4), 0xFF000000 | (0x010101 * (uint32_t)s[0]));

    s += 1 * 1;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}
#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_64)

static uint64_t  //
wuffs_base__pixel_swizzler__xxxx__y(uint8_t* dst_ptr,
                                    size_t dst_len,
                                    uint8_t* dst_palette_ptr,
                                    size_t dst_palette_len,
                                    const uint8_t* src_ptr,
                                    size_t src_len) {
  size_t dst_len4 = dst_len / 4;
  size_t len = (dst_len4 < src_len) ? dst_len4 : src_len;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  while (n >= 1) {
    wuffs_base__poke_u32le__no_bounds_check(
        d + (0 * 4), 0xFF000000 | (0x010101 * (uint32_t)s[0]));

    s += 1 * 1;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__xxxx__y_16be(uint8_t* dst_ptr,
                                         size_t dst_len,
                                         uint8_t* dst_palette_ptr,
                                         size_t dst_palette_len,
                                         const uint8_t* src_ptr,
                                         size_t src_len) {
  size_t dst_len4 = dst_len / 4;
  size_t src_len2 = src_len / 2;
  size_t len = (dst_len4 < src_len2) ? dst_len4 : src_len2;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  while (n >= 1) {
    wuffs_base__poke_u32le__no_bounds_check(
        d + (0 * 4), 0xFF000000 | (0x010101 * (uint32_t)s[0]));

    s += 1 * 2;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}

// --------

static uint64_t  //
wuffs_base__pixel_swizzler__y__y_16be(uint8_t* dst_ptr,
                                      size_t dst_len,
                                      uint8_t* dst_palette_ptr,
                                      size_t dst_palette_len,
                                      const uint8_t* src_ptr,
                                      size_t src_len) {
  size_t src_len2 = src_len / 2;
  size_t len = (dst_len < src_len2) ? dst_len : src_len2;
  uint8_t* d = dst_ptr;
  const uint8_t* s = src_ptr;
  size_t n = len;

  while (n >= 1) {
    d[0] = s[0];

    s += 1 * 2;
    d += 1 * 1;
    n -= 1;
  }

  return len;
}

// --------

static uint64_t  //
wuffs_base__pixel_swizzler__transparent_black_src(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    uint64_t num_pixels,
    uint32_t dst_pixfmt_bytes_per_pixel) {
  uint64_t n = ((uint64_t)dst_len) / dst_pixfmt_bytes_per_pixel;
  if (n > num_pixels) {
    n = num_pixels;
  }
  memset(dst_ptr, 0, ((size_t)(n * dst_pixfmt_bytes_per_pixel)));
  return n;
}

static uint64_t  //
wuffs_base__pixel_swizzler__transparent_black_src_over(
    uint8_t* dst_ptr,
    size_t dst_len,
    uint8_t* dst_palette_ptr,
    size_t dst_palette_len,
    uint64_t num_pixels,
    uint32_t dst_pixfmt_bytes_per_pixel) {
  uint64_t n = ((uint64_t)dst_len) / dst_pixfmt_bytes_per_pixel;
  if (n > num_pixels) {
    n = num_pixels;
  }
  return n;
}

// --------

static wuffs_base__pixel_swizzler__func  //
wuffs_base__pixel_swizzler__prepare__y(wuffs_base__pixel_swizzler* p,
                                       wuffs_base__pixel_format dst_pixfmt,
                                       wuffs_base__slice_u8 dst_palette,
                                       wuffs_base__slice_u8 src_palette,
                                       wuffs_base__pixel_blend blend) {
  switch (dst_pixfmt.repr) {
    case WUFFS_BASE__PIXEL_FORMAT__Y:
      return wuffs_base__pixel_swizzler__copy_1_1;

    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
      return wuffs_base__pixel_swizzler__bgr_565__y;

    case WUFFS_BASE__PIXEL_FORMAT__BGR:
    case WUFFS_BASE__PIXEL_FORMAT__RGB:
      return wuffs_base__pixel_swizzler__xxx__y;

    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
      if (wuffs_base__cpu_arch__have_x86_sse42()) {
        return wuffs_base__pixel_swizzler__xxxx__y__sse42;
      }
#endif
      return wuffs_base__pixel_swizzler__xxxx__y;
  }
  return NULL;
}

static wuffs_base__pixel_swizzler__func  //
wuffs_base__pixel_swizzler__prepare__y_16be(wuffs_base__pixel_swizzler* p,
                                            wuffs_base__pixel_format dst_pixfmt,
                                            wuffs_base__slice_u8 dst_palette,
                                            wuffs_base__slice_u8 src_palette,
                                            wuffs_base__pixel_blend blend) {
  switch (dst_pixfmt.repr) {
    case WUFFS_BASE__PIXEL_FORMAT__Y:
      return wuffs_base__pixel_swizzler__y__y_16be;

    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
      return wuffs_base__pixel_swizzler__bgr_565__y_16be;

    case WUFFS_BASE__PIXEL_FORMAT__BGR:
    case WUFFS_BASE__PIXEL_FORMAT__RGB:
      return wuffs_base__pixel_swizzler__xxx__y_16be;
      break;

    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
      return wuffs_base__pixel_swizzler__xxxx__y_16be;
  }
  return NULL;
}

static wuffs_base__pixel_swizzler__func  //
wuffs_base__pixel_swizzler__prepare__indexed__bgra_nonpremul(
    wuffs_base__pixel_swizzler* p,
    wuffs_base__pixel_format dst_pixfmt,
    wuffs_base__slice_u8 dst_palette,
    wuffs_base__slice_u8 src_palette,
    wuffs_base__pixel_blend blend) {
  switch (dst_pixfmt.repr) {
    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL:
      if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
          1024) {
        return NULL;
      }
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
          return wuffs_base__pixel_swizzler__copy_1_1;
      }
      return NULL;

    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
          if (wuffs_base__pixel_swizzler__squash_align4_bgr_565_8888(
                  dst_palette.ptr, dst_palette.len, src_palette.ptr,
                  src_palette.len, true) != 256) {
            return NULL;
          }
          return wuffs_base__pixel_swizzler__bgr_565__index__src;
        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
          if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
              1024) {
            return NULL;
          }
          return wuffs_base__pixel_swizzler__bgr_565__index_bgra_nonpremul__src_over;
      }
      return NULL;

    case WUFFS_BASE__PIXEL_FORMAT__BGR:
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
          if (wuffs_base__pixel_swizzler__bgra_premul__bgra_nonpremul__src(
                  dst_palette.ptr, dst_palette.len, NULL, 0, src_palette.ptr,
                  src_palette.len) != 256) {
            return NULL;
          }
          return wuffs_base__pixel_swizzler__xxx__index__src;
        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
          if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
              1024) {
            return NULL;
          }
          return wuffs_base__pixel_swizzler__xxx__index_bgra_nonpremul__src_over;
      }
      return NULL;

    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
      if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
          1024) {
        return NULL;
      }
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
          return wuffs_base__pixel_swizzler__xxxx__index__src;
        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
          return wuffs_base__pixel_swizzler__bgra_nonpremul__index_bgra_nonpremul__src_over;
      }
      return NULL;

    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
          if (wuffs_base__pixel_swizzler__bgra_premul__bgra_nonpremul__src(
                  dst_palette.ptr, dst_palette.len, NULL, 0, src_palette.ptr,
                  src_palette.len) != 256) {
            return NULL;
          }
          return wuffs_base__pixel_swizzler__xxxx__index__src;
        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
          if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
              1024) {
            return NULL;
          }
          return wuffs_base__pixel_swizzler__bgra_premul__index_bgra_nonpremul__src_over;
      }
      return NULL;

    case WUFFS_BASE__PIXEL_FORMAT__RGB:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
      // TODO.
      break;
  }
  return NULL;
}

static wuffs_base__pixel_swizzler__func  //
wuffs_base__pixel_swizzler__prepare__indexed__bgra_binary(
    wuffs_base__pixel_swizzler* p,
    wuffs_base__pixel_format dst_pixfmt,
    wuffs_base__slice_u8 dst_palette,
    wuffs_base__slice_u8 src_palette,
    wuffs_base__pixel_blend blend) {
  switch (dst_pixfmt.repr) {
    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY:
      if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
          1024) {
        return NULL;
      }
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
          return wuffs_base__pixel_swizzler__copy_1_1;
      }
      return NULL;

    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
      if (wuffs_base__pixel_swizzler__squash_align4_bgr_565_8888(
              dst_palette.ptr, dst_palette.len, src_palette.ptr,
              src_palette.len, false) != 256) {
        return NULL;
      }
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
          return wuffs_base__pixel_swizzler__bgr_565__index__src;
        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
          return wuffs_base__pixel_swizzler__bgr_565__index_binary_alpha__src_over;
      }
      return NULL;

    case WUFFS_BASE__PIXEL_FORMAT__BGR:
      if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
          1024) {
        return NULL;
      }
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
          return wuffs_base__pixel_swizzler__xxx__index__src;
        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
          return wuffs_base__pixel_swizzler__xxx__index_binary_alpha__src_over;
      }
      return NULL;

    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
      if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
          1024) {
        return NULL;
      }
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
          return wuffs_base__pixel_swizzler__xxxx__index__src;
        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
          return wuffs_base__pixel_swizzler__xxxx__index_binary_alpha__src_over;
      }
      return NULL;

    case WUFFS_BASE__PIXEL_FORMAT__RGB:
      if (wuffs_base__pixel_swizzler__swap_rgbx_bgrx(
              dst_palette.ptr, dst_palette.len, NULL, 0, src_palette.ptr,
              src_palette.len) != 256) {
        return NULL;
      }
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
          return wuffs_base__pixel_swizzler__xxx__index__src;
        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
          return wuffs_base__pixel_swizzler__xxx__index_binary_alpha__src_over;
      }
      return NULL;

    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
      if (wuffs_base__pixel_swizzler__swap_rgbx_bgrx(
              dst_palette.ptr, dst_palette.len, NULL, 0, src_palette.ptr,
              src_palette.len) != 256) {
        return NULL;
      }
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
          return wuffs_base__pixel_swizzler__xxxx__index__src;
        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
          return wuffs_base__pixel_swizzler__xxxx__index_binary_alpha__src_over;
      }
      return NULL;
  }
  return NULL;
}

static wuffs_base__pixel_swizzler__func  //
wuffs_base__pixel_swizzler__prepare__bgr(wuffs_base__pixel_swizzler* p,
                                         wuffs_base__pixel_format dst_pixfmt,
                                         wuffs_base__slice_u8 dst_palette,
                                         wuffs_base__slice_u8 src_palette,
                                         wuffs_base__pixel_blend blend) {
  switch (dst_pixfmt.repr) {
    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
      return wuffs_base__pixel_swizzler__bgr_565__bgr;

    case WUFFS_BASE__PIXEL_FORMAT__BGR:
      return wuffs_base__pixel_swizzler__copy_3_3;

    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
      return wuffs_base__pixel_swizzler__bgrw__bgr;

    case WUFFS_BASE__PIXEL_FORMAT__RGB:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
      // TODO.
      break;
  }
  return NULL;
}

static wuffs_base__pixel_swizzler__func  //
wuffs_base__pixel_swizzler__prepare__bgra_nonpremul(
    wuffs_base__pixel_swizzler* p,
    wuffs_base__pixel_format dst_pixfmt,
    wuffs_base__slice_u8 dst_palette,
    wuffs_base__slice_u8 src_palette,
    wuffs_base__pixel_blend blend) {
  switch (dst_pixfmt.repr) {
    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
          return wuffs_base__pixel_swizzler__bgr_565__bgra_nonpremul__src;
        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
          return wuffs_base__pixel_swizzler__bgr_565__bgra_nonpremul__src_over;
      }
      return NULL;

    case WUFFS_BASE__PIXEL_FORMAT__BGR:
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
          return wuffs_base__pixel_swizzler__bgr__bgra_nonpremul__src;
        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
          return wuffs_base__pixel_swizzler__bgr__bgra_nonpremul__src_over;
      }
      return NULL;

    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
          return wuffs_base__pixel_swizzler__copy_4_4;
        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
          return wuffs_base__pixel_swizzler__bgra_nonpremul__bgra_nonpremul__src_over;
      }
      return NULL;

    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
          return wuffs_base__pixel_swizzler__bgra_premul__bgra_nonpremul__src;
        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
          return wuffs_base__pixel_swizzler__bgra_premul__bgra_nonpremul__src_over;
      }
      return NULL;

    case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
      // TODO.
      break;

    case WUFFS_BASE__PIXEL_FORMAT__RGB:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
      // TODO.
      break;
  }
  return NULL;
}

static wuffs_base__pixel_swizzler__func  //
wuffs_base__pixel_swizzler__prepare__bgra_nonpremul_4x16le(
    wuffs_base__pixel_swizzler* p,
    wuffs_base__pixel_format dst_pixfmt,
    wuffs_base__slice_u8 dst_palette,
    wuffs_base__slice_u8 src_palette,
    wuffs_base__pixel_blend blend) {
  switch (dst_pixfmt.repr) {
    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
          return wuffs_base__pixel_swizzler__bgr_565__bgra_nonpremul_4x16le__src;
        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
          return wuffs_base__pixel_swizzler__bgr_565__bgra_nonpremul_4x16le__src_over;
      }
      return NULL;

    case WUFFS_BASE__PIXEL_FORMAT__BGR:
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
          return wuffs_base__pixel_swizzler__bgr__bgra_nonpremul_4x16le__src;
        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
          return wuffs_base__pixel_swizzler__bgr__bgra_nonpremul_4x16le__src_over;
      }
      return NULL;

    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
          return wuffs_base__pixel_swizzler__squash_tight_4x8_4x16le;
        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
          return wuffs_base__pixel_swizzler__bgra_nonpremul__bgra_nonpremul_4x16le__src_over;
      }
      return NULL;

    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
          return wuffs_base__pixel_swizzler__bgra_premul__bgra_nonpremul_4x16le__src;
        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
          return wuffs_base__pixel_swizzler__bgra_premul__bgra_nonpremul_4x16le__src_over;
      }
      return NULL;

    case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
      // TODO.
      break;

    case WUFFS_BASE__PIXEL_FORMAT__RGB:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
      // TODO.
      break;
  }
  return NULL;
}

static wuffs_base__pixel_swizzler__func  //
wuffs_base__pixel_swizzler__prepare__bgrx(wuffs_base__pixel_swizzler* p,
                                          wuffs_base__pixel_format dst_pixfmt,
                                          wuffs_base__slice_u8 dst_palette,
                                          wuffs_base__slice_u8 src_palette,
                                          wuffs_base__pixel_blend blend) {
  switch (dst_pixfmt.repr) {
    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
      return wuffs_base__pixel_swizzler__bgr_565__bgrx;

    case WUFFS_BASE__PIXEL_FORMAT__BGR:
      return wuffs_base__pixel_swizzler__xxx__xxxx;

    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
      return wuffs_base__pixel_swizzler__bgrw__bgrx;

    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
      return wuffs_base__pixel_swizzler__copy_4_4;

    case WUFFS_BASE__PIXEL_FORMAT__RGB:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
      // TODO.
      break;
  }
  return NULL;
}

static wuffs_base__pixel_swizzler__func  //
wuffs_base__pixel_swizzler__prepare__rgb(wuffs_base__pixel_swizzler* p,
                                         wuffs_base__pixel_format dst_pixfmt,
                                         wuffs_base__slice_u8 dst_palette,
                                         wuffs_base__slice_u8 src_palette,
                                         wuffs_base__pixel_blend blend) {
  switch (dst_pixfmt.repr) {
    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
      return wuffs_base__pixel_swizzler__bgr_565__rgb;

    case WUFFS_BASE__PIXEL_FORMAT__BGR:
      return wuffs_base__pixel_swizzler__swap_rgb_bgr;

    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
      if (wuffs_base__cpu_arch__have_x86_sse42()) {
        return wuffs_base__pixel_swizzler__bgrw__rgb__sse42;
      }
#endif
      return wuffs_base__pixel_swizzler__bgrw__rgb;

    case WUFFS_BASE__PIXEL_FORMAT__RGB:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
      // TODO.
      break;
  }
  return NULL;
}

static wuffs_base__pixel_swizzler__func  //
wuffs_base__pixel_swizzler__prepare__rgba_nonpremul(
    wuffs_base__pixel_swizzler* p,
    wuffs_base__pixel_format dst_pixfmt,
    wuffs_base__slice_u8 dst_palette,
    wuffs_base__slice_u8 src_palette,
    wuffs_base__pixel_blend blend) {
  switch (dst_pixfmt.repr) {
    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
          return wuffs_base__pixel_swizzler__bgr_565__rgba_nonpremul__src;
        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
          return wuffs_base__pixel_swizzler__bgr_565__rgba_nonpremul__src_over;
      }
      return NULL;

    case WUFFS_BASE__PIXEL_FORMAT__BGR:
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
          return wuffs_base__pixel_swizzler__bgr__rgba_nonpremul__src;
        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
          return wuffs_base__pixel_swizzler__bgr__rgba_nonpremul__src_over;
      }
      return NULL;

    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
          if (wuffs_base__cpu_arch__have_x86_sse42()) {
            return wuffs_base__pixel_swizzler__swap_rgbx_bgrx__sse42;
          }
#endif
          return wuffs_base__pixel_swizzler__swap_rgbx_bgrx;
        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
          return wuffs_base__pixel_swizzler__bgra_nonpremul__rgba_nonpremul__src_over;
      }
      return NULL;

    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
      switch (blend) {
        case WUFFS_BASE__PIXEL_BLEND__SRC:
          return wuffs_base__pixel_swizzler__bgra_premul__rgba_nonpremul__src;
        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
          return wuffs_base__pixel_swizzler__bgra_premul__rgba_nonpremul__src_over;
      }
      return NULL;

    case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
      // TODO.
      break;

    case WUFFS_BASE__PIXEL_FORMAT__RGB:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
      // TODO.
      break;
  }
  return NULL;
}

// --------

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_base__pixel_swizzler__prepare(wuffs_base__pixel_swizzler* p,
                                    wuffs_base__pixel_format dst_pixfmt,
                                    wuffs_base__slice_u8 dst_palette,
                                    wuffs_base__pixel_format src_pixfmt,
                                    wuffs_base__slice_u8 src_palette,
                                    wuffs_base__pixel_blend blend) {
  if (!p) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  p->private_impl.func = NULL;
  p->private_impl.transparent_black_func = NULL;
  p->private_impl.dst_pixfmt_bytes_per_pixel = 0;
  p->private_impl.src_pixfmt_bytes_per_pixel = 0;

  wuffs_base__pixel_swizzler__func func = NULL;
  wuffs_base__pixel_swizzler__transparent_black_func transparent_black_func =
      NULL;

  uint32_t dst_pixfmt_bits_per_pixel =
      wuffs_base__pixel_format__bits_per_pixel(&dst_pixfmt);
  if ((dst_pixfmt_bits_per_pixel == 0) ||
      ((dst_pixfmt_bits_per_pixel & 7) != 0)) {
    return wuffs_base__make_status(
        wuffs_base__error__unsupported_pixel_swizzler_option);
  }

  uint32_t src_pixfmt_bits_per_pixel =
      wuffs_base__pixel_format__bits_per_pixel(&src_pixfmt);
  if ((src_pixfmt_bits_per_pixel == 0) ||
      ((src_pixfmt_bits_per_pixel & 7) != 0)) {
    return wuffs_base__make_status(
        wuffs_base__error__unsupported_pixel_swizzler_option);
  }

  // TODO: support many more formats.

  switch (blend) {
    case WUFFS_BASE__PIXEL_BLEND__SRC:
      transparent_black_func =
          wuffs_base__pixel_swizzler__transparent_black_src;
      break;

    case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
      transparent_black_func =
          wuffs_base__pixel_swizzler__transparent_black_src_over;
      break;
  }

  switch (src_pixfmt.repr) {
    case WUFFS_BASE__PIXEL_FORMAT__Y:
      func = wuffs_base__pixel_swizzler__prepare__y(p, dst_pixfmt, dst_palette,
                                                    src_palette, blend);
      break;

    case WUFFS_BASE__PIXEL_FORMAT__Y_16BE:
      func = wuffs_base__pixel_swizzler__prepare__y_16be(
          p, dst_pixfmt, dst_palette, src_palette, blend);
      break;

    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL:
      func = wuffs_base__pixel_swizzler__prepare__indexed__bgra_nonpremul(
          p, dst_pixfmt, dst_palette, src_palette, blend);
      break;

    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY:
      func = wuffs_base__pixel_swizzler__prepare__indexed__bgra_binary(
          p, dst_pixfmt, dst_palette, src_palette, blend);
      break;

    case WUFFS_BASE__PIXEL_FORMAT__BGR:
      func = wuffs_base__pixel_swizzler__prepare__bgr(
          p, dst_pixfmt, dst_palette, src_palette, blend);
      break;

    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
      func = wuffs_base__pixel_swizzler__prepare__bgra_nonpremul(
          p, dst_pixfmt, dst_palette, src_palette, blend);
      break;

    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
      func = wuffs_base__pixel_swizzler__prepare__bgra_nonpremul_4x16le(
          p, dst_pixfmt, dst_palette, src_palette, blend);
      break;

    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
      func = wuffs_base__pixel_swizzler__prepare__bgrx(
          p, dst_pixfmt, dst_palette, src_palette, blend);
      break;

    case WUFFS_BASE__PIXEL_FORMAT__RGB:
      func = wuffs_base__pixel_swizzler__prepare__rgb(
          p, dst_pixfmt, dst_palette, src_palette, blend);
      break;

    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
      func = wuffs_base__pixel_swizzler__prepare__rgba_nonpremul(
          p, dst_pixfmt, dst_palette, src_palette, blend);
      break;
  }

  p->private_impl.func = func;
  p->private_impl.transparent_black_func = transparent_black_func;
  p->private_impl.dst_pixfmt_bytes_per_pixel = dst_pixfmt_bits_per_pixel / 8;
  p->private_impl.src_pixfmt_bytes_per_pixel = src_pixfmt_bits_per_pixel / 8;
  return wuffs_base__make_status(
      func ? NULL : wuffs_base__error__unsupported_pixel_swizzler_option);
}

WUFFS_BASE__MAYBE_STATIC uint64_t  //
wuffs_base__pixel_swizzler__limited_swizzle_u32_interleaved_from_reader(
    const wuffs_base__pixel_swizzler* p,
    uint32_t up_to_num_pixels,
    wuffs_base__slice_u8 dst,
    wuffs_base__slice_u8 dst_palette,
    const uint8_t** ptr_iop_r,
    const uint8_t* io2_r) {
  if (p && p->private_impl.func) {
    const uint8_t* iop_r = *ptr_iop_r;
    uint64_t src_len = wuffs_base__u64__min(
        ((uint64_t)up_to_num_pixels) *
            ((uint64_t)p->private_impl.src_pixfmt_bytes_per_pixel),
        ((uint64_t)(io2_r - iop_r)));
    uint64_t n =
        (*p->private_impl.func)(dst.ptr, dst.len, dst_palette.ptr,
                                dst_palette.len, iop_r, (size_t)src_len);
    *ptr_iop_r += n * p->private_impl.src_pixfmt_bytes_per_pixel;
    return n;
  }
  return 0;
}

WUFFS_BASE__MAYBE_STATIC uint64_t  //
wuffs_base__pixel_swizzler__swizzle_interleaved_from_reader(
    const wuffs_base__pixel_swizzler* p,
    wuffs_base__slice_u8 dst,
    wuffs_base__slice_u8 dst_palette,
    const uint8_t** ptr_iop_r,
    const uint8_t* io2_r) {
  if (p && p->private_impl.func) {
    const uint8_t* iop_r = *ptr_iop_r;
    uint64_t src_len = ((uint64_t)(io2_r - iop_r));
    uint64_t n =
        (*p->private_impl.func)(dst.ptr, dst.len, dst_palette.ptr,
                                dst_palette.len, iop_r, (size_t)src_len);
    *ptr_iop_r += n * p->private_impl.src_pixfmt_bytes_per_pixel;
    return n;
  }
  return 0;
}

WUFFS_BASE__MAYBE_STATIC uint64_t  //
wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(
    const wuffs_base__pixel_swizzler* p,
    wuffs_base__slice_u8 dst,
    wuffs_base__slice_u8 dst_palette,
    wuffs_base__slice_u8 src) {
  if (p && p->private_impl.func) {
    return (*p->private_impl.func)(dst.ptr, dst.len, dst_palette.ptr,
                                   dst_palette.len, src.ptr, src.len);
  }
  return 0;
}

WUFFS_BASE__MAYBE_STATIC uint64_t  //
wuffs_base__pixel_swizzler__swizzle_interleaved_transparent_black(
    const wuffs_base__pixel_swizzler* p,
    wuffs_base__slice_u8 dst,
    wuffs_base__slice_u8 dst_palette,
    uint64_t num_pixels) {
  if (p && p->private_impl.transparent_black_func) {
    return (*p->private_impl.transparent_black_func)(
        dst.ptr, dst.len, dst_palette.ptr, dst_palette.len, num_pixels,
        p->private_impl.dst_pixfmt_bytes_per_pixel);
  }
  return 0;
}

#endif  // !defined(WUFFS_CONFIG__MODULES) ||
        // defined(WUFFS_CONFIG__MODULE__BASE) ||
        // defined(WUFFS_CONFIG__MODULE__BASE__PIXCONV)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BASE) || \
    defined(WUFFS_CONFIG__MODULE__BASE__UTF8)

// ---------------- Unicode and UTF-8

WUFFS_BASE__MAYBE_STATIC size_t  //
wuffs_base__utf_8__encode(wuffs_base__slice_u8 dst, uint32_t code_point) {
  if (code_point <= 0x7F) {
    if (dst.len >= 1) {
      dst.ptr[0] = (uint8_t)(code_point);
      return 1;
    }

  } else if (code_point <= 0x07FF) {
    if (dst.len >= 2) {
      dst.ptr[0] = (uint8_t)(0xC0 | ((code_point >> 6)));
      dst.ptr[1] = (uint8_t)(0x80 | ((code_point >> 0) & 0x3F));
      return 2;
    }

  } else if (code_point <= 0xFFFF) {
    if ((dst.len >= 3) && ((code_point < 0xD800) || (0xDFFF < code_point))) {
      dst.ptr[0] = (uint8_t)(0xE0 | ((code_point >> 12)));
      dst.ptr[1] = (uint8_t)(0x80 | ((code_point >> 6) & 0x3F));
      dst.ptr[2] = (uint8_t)(0x80 | ((code_point >> 0) & 0x3F));
      return 3;
    }

  } else if (code_point <= 0x10FFFF) {
    if (dst.len >= 4) {
      dst.ptr[0] = (uint8_t)(0xF0 | ((code_point >> 18)));
      dst.ptr[1] = (uint8_t)(0x80 | ((code_point >> 12) & 0x3F));
      dst.ptr[2] = (uint8_t)(0x80 | ((code_point >> 6) & 0x3F));
      dst.ptr[3] = (uint8_t)(0x80 | ((code_point >> 0) & 0x3F));
      return 4;
    }
  }

  return 0;
}

// wuffs_base__utf_8__byte_length_minus_1 is the byte length (minus 1) of a
// UTF-8 encoded code point, based on the encoding's initial byte.
//  - 0x00 is 1-byte UTF-8 (ASCII).
//  - 0x01 is the start of 2-byte UTF-8.
//  - 0x02 is the start of 3-byte UTF-8.
//  - 0x03 is the start of 4-byte UTF-8.
//  - 0x40 is a UTF-8 tail byte.
//  - 0x80 is invalid UTF-8.
//
// RFC 3629 (UTF-8) gives this grammar for valid UTF-8:
//    UTF8-1      = %x00-7F
//    UTF8-2      = %xC2-DF UTF8-tail
//    UTF8-3      = %xE0 %xA0-BF UTF8-tail / %xE1-EC 2( UTF8-tail ) /
//                  %xED %x80-9F UTF8-tail / %xEE-EF 2( UTF8-tail )
//    UTF8-4      = %xF0 %x90-BF 2( UTF8-tail ) / %xF1-F3 3( UTF8-tail ) /
//                  %xF4 %x80-8F 2( UTF8-tail )
//    UTF8-tail   = %x80-BF
static const uint8_t wuffs_base__utf_8__byte_length_minus_1[256] = {
    // 0     1     2     3     4     5     6     7
    // 8     9     A     B     C     D     E     F
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x00 ..= 0x07.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x08 ..= 0x0F.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x10 ..= 0x17.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x18 ..= 0x1F.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x20 ..= 0x27.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x28 ..= 0x2F.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x30 ..= 0x37.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x38 ..= 0x3F.

    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x40 ..= 0x47.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x48 ..= 0x4F.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x50 ..= 0x57.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x58 ..= 0x5F.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x60 ..= 0x67.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x68 ..= 0x6F.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x70 ..= 0x77.
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x78 ..= 0x7F.

    0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  // 0x80 ..= 0x87.
    0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  // 0x88 ..= 0x8F.
    0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  // 0x90 ..= 0x97.
    0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  // 0x98 ..= 0x9F.
    0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  // 0xA0 ..= 0xA7.
    0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  // 0xA8 ..= 0xAF.
    0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  // 0xB0 ..= 0xB7.
    0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  // 0xB8 ..= 0xBF.

    0x80, 0x80, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,  // 0xC0 ..= 0xC7.
    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,  // 0xC8 ..= 0xCF.
    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,  // 0xD0 ..= 0xD7.
    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,  // 0xD8 ..= 0xDF.
    0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,  // 0xE0 ..= 0xE7.
    0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,  // 0xE8 ..= 0xEF.
    0x03, 0x03, 0x03, 0x03, 0x03, 0x80, 0x80, 0x80,  // 0xF0 ..= 0xF7.
    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xF8 ..= 0xFF.
    // 0     1     2     3     4     5     6     7
    // 8     9     A     B     C     D     E     F
};

WUFFS_BASE__MAYBE_STATIC wuffs_base__utf_8__next__output  //
wuffs_base__utf_8__next(const uint8_t* s_ptr, size_t s_len) {
  if (s_len == 0) {
    return wuffs_base__make_utf_8__next__output(0, 0);
  }
  uint32_t c = s_ptr[0];
  switch (wuffs_base__utf_8__byte_length_minus_1[c & 0xFF]) {
    case 0:
      return wuffs_base__make_utf_8__next__output(c, 1);

    case 1:
      if (s_len < 2) {
        break;
      }
      c = wuffs_base__peek_u16le__no_bounds_check(s_ptr);
      if ((c & 0xC000) != 0x8000) {
        break;
      }
      c = (0x0007C0 & (c << 6)) | (0x00003F & (c >> 8));
      return wuffs_base__make_utf_8__next__output(c, 2);

    case 2:
      if (s_len < 3) {
        break;
      }
      c = wuffs_base__peek_u24le__no_bounds_check(s_ptr);
      if ((c & 0xC0C000) != 0x808000) {
        break;
      }
      c = (0x00F000 & (c << 12)) | (0x000FC0 & (c >> 2)) |
          (0x00003F & (c >> 16));
      if ((c <= 0x07FF) || ((0xD800 <= c) && (c <= 0xDFFF))) {
        break;
      }
      return wuffs_base__make_utf_8__next__output(c, 3);

    case 3:
      if (s_len < 4) {
        break;
      }
      c = wuffs_base__peek_u32le__no_bounds_check(s_ptr);
      if ((c & 0xC0C0C000) != 0x80808000) {
        break;
      }
      c = (0x1C0000 & (c << 18)) | (0x03F000 & (c << 4)) |
          (0x000FC0 & (c >> 10)) | (0x00003F & (c >> 24));
      if ((c <= 0xFFFF) || (0x110000 <= c)) {
        break;
      }
      return wuffs_base__make_utf_8__next__output(c, 4);
  }

  return wuffs_base__make_utf_8__next__output(
      WUFFS_BASE__UNICODE_REPLACEMENT_CHARACTER, 1);
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__utf_8__next__output  //
wuffs_base__utf_8__next_from_end(const uint8_t* s_ptr, size_t s_len) {
  if (s_len == 0) {
    return wuffs_base__make_utf_8__next__output(0, 0);
  }
  const uint8_t* ptr = &s_ptr[s_len - 1];
  if (*ptr < 0x80) {
    return wuffs_base__make_utf_8__next__output(*ptr, 1);

  } else if (*ptr < 0xC0) {
    const uint8_t* too_far = &s_ptr[(s_len > 4) ? (s_len - 4) : 0];
    uint32_t n = 1;
    while (ptr != too_far) {
      ptr--;
      n++;
      if (*ptr < 0x80) {
        break;
      } else if (*ptr < 0xC0) {
        continue;
      }
      wuffs_base__utf_8__next__output o = wuffs_base__utf_8__next(ptr, n);
      if (o.byte_length != n) {
        break;
      }
      return o;
    }
  }

  return wuffs_base__make_utf_8__next__output(
      WUFFS_BASE__UNICODE_REPLACEMENT_CHARACTER, 1);
}

WUFFS_BASE__MAYBE_STATIC size_t  //
wuffs_base__utf_8__longest_valid_prefix(const uint8_t* s_ptr, size_t s_len) {
  // TODO: possibly optimize the all-ASCII case (4 or 8 bytes at a time).
  //
  // TODO: possibly optimize this by manually inlining the
  // wuffs_base__utf_8__next calls.
  size_t original_len = s_len;
  while (s_len > 0) {
    wuffs_base__utf_8__next__output o = wuffs_base__utf_8__next(s_ptr, s_len);
    if ((o.code_point > 0x7F) && (o.byte_length == 1)) {
      break;
    }
    s_ptr += o.byte_length;
    s_len -= o.byte_length;
  }
  return original_len - s_len;
}

WUFFS_BASE__MAYBE_STATIC size_t  //
wuffs_base__ascii__longest_valid_prefix(const uint8_t* s_ptr, size_t s_len) {
  // TODO: possibly optimize this by checking 4 or 8 bytes at a time.
  const uint8_t* original_ptr = s_ptr;
  const uint8_t* p = s_ptr;
  const uint8_t* q = s_ptr + s_len;
  for (; (p != q) && ((*p & 0x80) == 0); p++) {
  }
  return (size_t)(p - original_ptr);
}

#endif  // !defined(WUFFS_CONFIG__MODULES) ||
        // defined(WUFFS_CONFIG__MODULE__BASE) ||
        // defined(WUFFS_CONFIG__MODULE__BASE__UTF8)

#ifdef __cplusplus
}  // extern "C"
#endif

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__ADLER32)

// ---------------- Status Codes Implementations

// ---------------- Private Consts

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

static wuffs_base__empty_struct
wuffs_adler32__hasher__up(
    wuffs_adler32__hasher* self,
    wuffs_base__slice_u8 a_x);

static wuffs_base__empty_struct
wuffs_adler32__hasher__up__choosy_default(
    wuffs_adler32__hasher* self,
    wuffs_base__slice_u8 a_x);

#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
static wuffs_base__empty_struct
wuffs_adler32__hasher__up_arm_neon(
    wuffs_adler32__hasher* self,
    wuffs_base__slice_u8 a_x);
#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)

#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
static wuffs_base__empty_struct
wuffs_adler32__hasher__up_x86_sse42(
    wuffs_adler32__hasher* self,
    wuffs_base__slice_u8 a_x);
#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_64)

// ---------------- VTables

const wuffs_base__hasher_u32__func_ptrs
wuffs_adler32__hasher__func_ptrs_for__wuffs_base__hasher_u32 = {
  (wuffs_base__empty_struct(*)(void*,
      uint32_t,
      bool))(&wuffs_adler32__hasher__set_quirk_enabled),
  (uint32_t(*)(void*,
      wuffs_base__slice_u8))(&wuffs_adler32__hasher__update_u32),
};

// ---------------- Initializer Implementations

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_adler32__hasher__initialize(
    wuffs_adler32__hasher* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options){
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (sizeof(*self) != sizeof_star_self) {
    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
  }
  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
  }

  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
    // The whole point of this if-check is to detect an uninitialized *self.
    // We disable the warning on GCC. Clang-5.0 does not have this warning.
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
    if (self->private_impl.magic != 0) {
      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
    }
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
  } else {
    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    } else {
      memset(&(self->private_impl), 0, sizeof(self->private_impl));
    }
  }

  self->private_impl.choosy_up = &wuffs_adler32__hasher__up__choosy_default;

  self->private_impl.magic = WUFFS_BASE__MAGIC;
  self->private_impl.vtable_for__wuffs_base__hasher_u32.vtable_name =
      wuffs_base__hasher_u32__vtable_name;
  self->private_impl.vtable_for__wuffs_base__hasher_u32.function_pointers =
      (const void*)(&wuffs_adler32__hasher__func_ptrs_for__wuffs_base__hasher_u32);
  return wuffs_base__make_status(NULL);
}

wuffs_adler32__hasher*
wuffs_adler32__hasher__alloc() {
  wuffs_adler32__hasher* x =
      (wuffs_adler32__hasher*)(calloc(sizeof(wuffs_adler32__hasher), 1));
  if (!x) {
    return NULL;
  }
  if (wuffs_adler32__hasher__initialize(
      x, sizeof(wuffs_adler32__hasher), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
    free(x);
    return NULL;
  }
  return x;
}

size_t
sizeof__wuffs_adler32__hasher() {
  return sizeof(wuffs_adler32__hasher);
}

// ---------------- Function Implementations

// -------- func adler32.hasher.set_quirk_enabled

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_adler32__hasher__set_quirk_enabled(
    wuffs_adler32__hasher* self,
    uint32_t a_quirk,
    bool a_enabled) {
  return wuffs_base__make_empty_struct();
}

// -------- func adler32.hasher.update_u32

WUFFS_BASE__MAYBE_STATIC uint32_t
wuffs_adler32__hasher__update_u32(
    wuffs_adler32__hasher* self,
    wuffs_base__slice_u8 a_x) {
  if (!self) {
    return 0;
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return 0;
  }

  if ( ! self->private_impl.f_started) {
    self->private_impl.f_started = true;
    self->private_impl.f_state = 1;
    self->private_impl.choosy_up = (
#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
        wuffs_base__cpu_arch__have_arm_neon() ? &wuffs_adler32__hasher__up_arm_neon :
#endif
#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
        wuffs_base__cpu_arch__have_x86_sse42() ? &wuffs_adler32__hasher__up_x86_sse42 :
#endif
        self->private_impl.choosy_up);
  }
  wuffs_adler32__hasher__up(self, a_x);
  return self->private_impl.f_state;
}

// -------- func adler32.hasher.up

static wuffs_base__empty_struct
wuffs_adler32__hasher__up(
    wuffs_adler32__hasher* self,
    wuffs_base__slice_u8 a_x) {
  return (*self->private_impl.choosy_up)(self, a_x);
}

static wuffs_base__empty_struct
wuffs_adler32__hasher__up__choosy_default(
    wuffs_adler32__hasher* self,
    wuffs_base__slice_u8 a_x) {
  uint32_t v_s1 = 0;
  uint32_t v_s2 = 0;
  wuffs_base__slice_u8 v_remaining = {0};
  wuffs_base__slice_u8 v_p = {0};

  v_s1 = ((self->private_impl.f_state) & 0xFFFF);
  v_s2 = ((self->private_impl.f_state) >> (32 - (16)));
  while (((uint64_t)(a_x.len)) > 0) {
    v_remaining = wuffs_base__slice_u8__subslice_j(a_x, 0);
    if (((uint64_t)(a_x.len)) > 5552) {
      v_remaining = wuffs_base__slice_u8__subslice_i(a_x, 5552);
      a_x = wuffs_base__slice_u8__subslice_j(a_x, 5552);
    }
    {
      wuffs_base__slice_u8 i_slice_p = a_x;
      v_p.ptr = i_slice_p.ptr;
      v_p.len = 1;
      uint8_t* i_end0_p = v_p.ptr + (((i_slice_p.len - (size_t)(v_p.ptr - i_slice_p.ptr)) / 8) * 8);
      while (v_p.ptr < i_end0_p) {
        v_s1 += ((uint32_t)(v_p.ptr[0]));
        v_s2 += v_s1;
        v_p.ptr += 1;
        v_s1 += ((uint32_t)(v_p.ptr[0]));
        v_s2 += v_s1;
        v_p.ptr += 1;
        v_s1 += ((uint32_t)(v_p.ptr[0]));
        v_s2 += v_s1;
        v_p.ptr += 1;
        v_s1 += ((uint32_t)(v_p.ptr[0]));
        v_s2 += v_s1;
        v_p.ptr += 1;
        v_s1 += ((uint32_t)(v_p.ptr[0]));
        v_s2 += v_s1;
        v_p.ptr += 1;
        v_s1 += ((uint32_t)(v_p.ptr[0]));
        v_s2 += v_s1;
        v_p.ptr += 1;
        v_s1 += ((uint32_t)(v_p.ptr[0]));
        v_s2 += v_s1;
        v_p.ptr += 1;
        v_s1 += ((uint32_t)(v_p.ptr[0]));
        v_s2 += v_s1;
        v_p.ptr += 1;
      }
      v_p.len = 1;
      uint8_t* i_end1_p = i_slice_p.ptr + i_slice_p.len;
      while (v_p.ptr < i_end1_p) {
        v_s1 += ((uint32_t)(v_p.ptr[0]));
        v_s2 += v_s1;
        v_p.ptr += 1;
      }
      v_p.len = 0;
    }
    v_s1 %= 65521;
    v_s2 %= 65521;
    a_x = v_remaining;
  }
  self->private_impl.f_state = (((v_s2 & 65535) << 16) | (v_s1 & 65535));
  return wuffs_base__make_empty_struct();
}

// -------- func adler32.hasher.up_arm_neon

#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
static wuffs_base__empty_struct
wuffs_adler32__hasher__up_arm_neon(
    wuffs_adler32__hasher* self,
    wuffs_base__slice_u8 a_x) {
  uint32_t v_s1 = 0;
  uint32_t v_s2 = 0;
  wuffs_base__slice_u8 v_remaining = {0};
  wuffs_base__slice_u8 v_p = {0};
  uint8x16_t v_p__left = {0};
  uint8x16_t v_p_right = {0};
  uint32x4_t v_v1 = {0};
  uint32x4_t v_v2 = {0};
  uint16x8_t v_col0 = {0};
  uint16x8_t v_col1 = {0};
  uint16x8_t v_col2 = {0};
  uint16x8_t v_col3 = {0};
  uint32x2_t v_sum1 = {0};
  uint32x2_t v_sum2 = {0};
  uint32x2_t v_sum12 = {0};
  uint32_t v_num_iterate_bytes = 0;
  uint64_t v_tail_index = 0;

  v_s1 = ((self->private_impl.f_state) & 0xFFFF);
  v_s2 = ((self->private_impl.f_state) >> (32 - (16)));
  while ((((uint64_t)(a_x.len)) > 0) && ((15 & ((uint32_t)(0xFFF & (uintptr_t)(a_x.ptr)))) != 0)) {
    v_s1 += ((uint32_t)(a_x.ptr[0]));
    v_s2 += v_s1;
    a_x = wuffs_base__slice_u8__subslice_i(a_x, 1);
  }
  v_s1 %= 65521;
  v_s2 %= 65521;
  while (((uint64_t)(a_x.len)) > 0) {
    v_remaining = wuffs_base__slice_u8__subslice_j(a_x, 0);
    if (((uint64_t)(a_x.len)) > 5536) {
      v_remaining = wuffs_base__slice_u8__subslice_i(a_x, 5536);
      a_x = wuffs_base__slice_u8__subslice_j(a_x, 5536);
    }
    v_num_iterate_bytes = ((uint32_t)((((uint64_t)(a_x.len)) & 4294967264)));
    v_s2 += ((uint32_t)(v_s1 * v_num_iterate_bytes));
    v_v1 = vdupq_n_u32(0);
    v_v2 = vdupq_n_u32(0);
    v_col0 = vdupq_n_u16(0);
    v_col1 = vdupq_n_u16(0);
    v_col2 = vdupq_n_u16(0);
    v_col3 = vdupq_n_u16(0);
    {
      wuffs_base__slice_u8 i_slice_p = a_x;
      v_p.ptr = i_slice_p.ptr;
      v_p.len = 32;
      uint8_t* i_end0_p = v_p.ptr + (((i_slice_p.len - (size_t)(v_p.ptr - i_slice_p.ptr)) / 32) * 32);
      while (v_p.ptr < i_end0_p) {
        v_p__left = vld1q_u8(v_p.ptr);
        v_p_right = vld1q_u8(v_p.ptr + 16);
        v_v2 = vaddq_u32(v_v2, v_v1);
        v_v1 = vpadalq_u16(v_v1, vpadalq_u8(vpaddlq_u8(v_p__left), v_p_right));
        v_col0 = vaddw_u8(v_col0, vget_low_u8(v_p__left));
        v_col1 = vaddw_u8(v_col1, vget_high_u8(v_p__left));
        v_col2 = vaddw_u8(v_col2, vget_low_u8(v_p_right));
        v_col3 = vaddw_u8(v_col3, vget_high_u8(v_p_right));
        v_p.ptr += 32;
      }
      v_p.len = 0;
    }
    v_v2 = vshlq_n_u32(v_v2, 5);
    v_v2 = vmlal_u16(v_v2, vget_low_u16(v_col0), ((uint16x4_t){32, 31, 30, 29}));
    v_v2 = vmlal_u16(v_v2, vget_high_u16(v_col0), ((uint16x4_t){28, 27, 26, 25}));
    v_v2 = vmlal_u16(v_v2, vget_low_u16(v_col1), ((uint16x4_t){24, 23, 22, 21}));
    v_v2 = vmlal_u16(v_v2, vget_high_u16(v_col1), ((uint16x4_t){20, 19, 18, 17}));
    v_v2 = vmlal_u16(v_v2, vget_low_u16(v_col2), ((uint16x4_t){16, 15, 14, 13}));
    v_v2 = vmlal_u16(v_v2, vget_high_u16(v_col2), ((uint16x4_t){12, 11, 10, 9}));
    v_v2 = vmlal_u16(v_v2, vget_low_u16(v_col3), ((uint16x4_t){8, 7, 6, 5}));
    v_v2 = vmlal_u16(v_v2, vget_high_u16(v_col3), ((uint16x4_t){4, 3, 2, 1}));
    v_sum1 = vpadd_u32(vget_low_u32(v_v1), vget_high_u32(v_v1));
    v_sum2 = vpadd_u32(vget_low_u32(v_v2), vget_high_u32(v_v2));
    v_sum12 = vpadd_u32(v_sum1, v_sum2);
    v_s1 += vget_lane_u32(v_sum12, 0);
    v_s2 += vget_lane_u32(v_sum12, 1);
    v_tail_index = (((uint64_t)(a_x.len)) & 18446744073709551584u);
    if (v_tail_index < ((uint64_t)(a_x.len))) {
      {
        wuffs_base__slice_u8 i_slice_p = wuffs_base__slice_u8__subslice_i(a_x, v_tail_index);
        v_p.ptr = i_slice_p.ptr;
        v_p.len = 1;
        uint8_t* i_end0_p = i_slice_p.ptr + i_slice_p.len;
        while (v_p.ptr < i_end0_p) {
          v_s1 += ((uint32_t)(v_p.ptr[0]));
          v_s2 += v_s1;
          v_p.ptr += 1;
        }
        v_p.len = 0;
      }
    }
    v_s1 %= 65521;
    v_s2 %= 65521;
    a_x = v_remaining;
  }
  self->private_impl.f_state = (((v_s2 & 65535) << 16) | (v_s1 & 65535));
  return wuffs_base__make_empty_struct();
}
#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)

// -------- func adler32.hasher.up_x86_sse42

#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
#if defined(__GNUC__)
__attribute__((target("pclmul,popcnt,sse4.2")))
#endif
static wuffs_base__empty_struct
wuffs_adler32__hasher__up_x86_sse42(
    wuffs_adler32__hasher* self,
    wuffs_base__slice_u8 a_x) {
  uint32_t v_s1 = 0;
  uint32_t v_s2 = 0;
  wuffs_base__slice_u8 v_remaining = {0};
  wuffs_base__slice_u8 v_p = {0};
  __m128i v_zeroes = {0};
  __m128i v_ones = {0};
  __m128i v_weights__left = {0};
  __m128i v_weights_right = {0};
  __m128i v_p__left = {0};
  __m128i v_p_right = {0};
  __m128i v_v1 = {0};
  __m128i v_v2 = {0};
  __m128i v_v2j = {0};
  __m128i v_v2k = {0};
  uint32_t v_num_iterate_bytes = 0;
  uint64_t v_tail_index = 0;

  v_zeroes = _mm_set1_epi16((int16_t)(0));
  v_ones = _mm_set1_epi16((int16_t)(1));
  v_weights__left = _mm_set_epi8((int8_t)(17), (int8_t)(18), (int8_t)(19), (int8_t)(20), (int8_t)(21), (int8_t)(22), (int8_t)(23), (int8_t)(24), (int8_t)(25), (int8_t)(26), (int8_t)(27), (int8_t)(28), (int8_t)(29), (int8_t)(30), (int8_t)(31), (int8_t)(32));
  v_weights_right = _mm_set_epi8((int8_t)(1), (int8_t)(2), (int8_t)(3), (int8_t)(4), (int8_t)(5), (int8_t)(6), (int8_t)(7), (int8_t)(8), (int8_t)(9), (int8_t)(10), (int8_t)(11), (int8_t)(12), (int8_t)(13), (int8_t)(14), (int8_t)(15), (int8_t)(16));
  v_s1 = ((self->private_impl.f_state) & 0xFFFF);
  v_s2 = ((self->private_impl.f_state) >> (32 - (16)));
  while (((uint64_t)(a_x.len)) > 0) {
    v_remaining = wuffs_base__slice_u8__subslice_j(a_x, 0);
    if (((uint64_t)(a_x.len)) > 5536) {
      v_remaining = wuffs_base__slice_u8__subslice_i(a_x, 5536);
      a_x = wuffs_base__slice_u8__subslice_j(a_x, 5536);
    }
    v_num_iterate_bytes = ((uint32_t)((((uint64_t)(a_x.len)) & 4294967264)));
    v_s2 += ((uint32_t)(v_s1 * v_num_iterate_bytes));
    v_v1 = _mm_setzero_si128();
    v_v2j = _mm_setzero_si128();
    v_v2k = _mm_setzero_si128();
    {
      wuffs_base__slice_u8 i_slice_p = a_x;
      v_p.ptr = i_slice_p.ptr;
      v_p.len = 32;
      uint8_t* i_end0_p = v_p.ptr + (((i_slice_p.len - (size_t)(v_p.ptr - i_slice_p.ptr)) / 32) * 32);
      while (v_p.ptr < i_end0_p) {
        v_p__left = _mm_lddqu_si128((const __m128i*)(const void*)(v_p.ptr));
        v_p_right = _mm_lddqu_si128((const __m128i*)(const void*)(v_p.ptr + 16));
        v_v2j = _mm_add_epi32(v_v2j, v_v1);
        v_v1 = _mm_add_epi32(v_v1, _mm_sad_epu8(v_p__left, v_zeroes));
        v_v1 = _mm_add_epi32(v_v1, _mm_sad_epu8(v_p_right, v_zeroes));
        v_v2k = _mm_add_epi32(v_v2k, _mm_madd_epi16(v_ones, _mm_maddubs_epi16(v_p__left, v_weights__left)));
        v_v2k = _mm_add_epi32(v_v2k, _mm_madd_epi16(v_ones, _mm_maddubs_epi16(v_p_right, v_weights_right)));
        v_p.ptr += 32;
      }
      v_p.len = 0;
    }
    v_v1 = _mm_add_epi32(v_v1, _mm_shuffle_epi32(v_v1, (int32_t)(177)));
    v_v1 = _mm_add_epi32(v_v1, _mm_shuffle_epi32(v_v1, (int32_t)(78)));
    v_s1 += ((uint32_t)(_mm_cvtsi128_si32(v_v1)));
    v_v2 = _mm_add_epi32(v_v2k, _mm_slli_epi32(v_v2j, (int32_t)(5)));
    v_v2 = _mm_add_epi32(v_v2, _mm_shuffle_epi32(v_v2, (int32_t)(177)));
    v_v2 = _mm_add_epi32(v_v2, _mm_shuffle_epi32(v_v2, (int32_t)(78)));
    v_s2 += ((uint32_t)(_mm_cvtsi128_si32(v_v2)));
    v_tail_index = (((uint64_t)(a_x.len)) & 18446744073709551584u);
    if (v_tail_index < ((uint64_t)(a_x.len))) {
      {
        wuffs_base__slice_u8 i_slice_p = wuffs_base__slice_u8__subslice_i(a_x, v_tail_index);
        v_p.ptr = i_slice_p.ptr;
        v_p.len = 1;
        uint8_t* i_end0_p = i_slice_p.ptr + i_slice_p.len;
        while (v_p.ptr < i_end0_p) {
          v_s1 += ((uint32_t)(v_p.ptr[0]));
          v_s2 += v_s1;
          v_p.ptr += 1;
        }
        v_p.len = 0;
      }
    }
    v_s1 %= 65521;
    v_s2 %= 65521;
    a_x = v_remaining;
  }
  self->private_impl.f_state = (((v_s2 & 65535) << 16) | (v_s1 & 65535));
  return wuffs_base__make_empty_struct();
}
#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_64)

#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__ADLER32)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BMP)

// ---------------- Status Codes Implementations

const char wuffs_bmp__error__bad_header[] = "#bmp: bad header";
const char wuffs_bmp__error__bad_rle_compression[] = "#bmp: bad RLE compression";
const char wuffs_bmp__error__unsupported_bmp_file[] = "#bmp: unsupported BMP file";
const char wuffs_bmp__note__internal_note_short_read[] = "@bmp: internal note: short read";

// ---------------- Private Consts

#define WUFFS_BMP__COMPRESSION_NONE 0

#define WUFFS_BMP__COMPRESSION_RLE8 1

#define WUFFS_BMP__COMPRESSION_RLE4 2

#define WUFFS_BMP__COMPRESSION_BITFIELDS 3

#define WUFFS_BMP__COMPRESSION_JPEG 4

#define WUFFS_BMP__COMPRESSION_PNG 5

#define WUFFS_BMP__COMPRESSION_ALPHABITFIELDS 6

#define WUFFS_BMP__COMPRESSION_LOW_BIT_DEPTH 256

#define WUFFS_BMP__RLE_STATE_NEUTRAL 0

#define WUFFS_BMP__RLE_STATE_RUN 1

#define WUFFS_BMP__RLE_STATE_ESCAPE 2

#define WUFFS_BMP__RLE_STATE_LITERAL 3

#define WUFFS_BMP__RLE_STATE_DELTA_X 4

#define WUFFS_BMP__RLE_STATE_DELTA_Y 5

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

static wuffs_base__status
wuffs_bmp__decoder__swizzle_none(
    wuffs_bmp__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_bmp__decoder__swizzle_rle(
    wuffs_bmp__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_bmp__decoder__swizzle_bitfields(
    wuffs_bmp__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_bmp__decoder__swizzle_low_bit_depth(
    wuffs_bmp__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_bmp__decoder__read_palette(
    wuffs_bmp__decoder* self,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_bmp__decoder__process_masks(
    wuffs_bmp__decoder* self);

// ---------------- VTables

const wuffs_base__image_decoder__func_ptrs
wuffs_bmp__decoder__func_ptrs_for__wuffs_base__image_decoder = {
  (wuffs_base__status(*)(void*,
      wuffs_base__pixel_buffer*,
      wuffs_base__io_buffer*,
      wuffs_base__pixel_blend,
      wuffs_base__slice_u8,
      wuffs_base__decode_frame_options*))(&wuffs_bmp__decoder__decode_frame),
  (wuffs_base__status(*)(void*,
      wuffs_base__frame_config*,
      wuffs_base__io_buffer*))(&wuffs_bmp__decoder__decode_frame_config),
  (wuffs_base__status(*)(void*,
      wuffs_base__image_config*,
      wuffs_base__io_buffer*))(&wuffs_bmp__decoder__decode_image_config),
  (wuffs_base__rect_ie_u32(*)(const void*))(&wuffs_bmp__decoder__frame_dirty_rect),
  (uint32_t(*)(const void*))(&wuffs_bmp__decoder__num_animation_loops),
  (uint64_t(*)(const void*))(&wuffs_bmp__decoder__num_decoded_frame_configs),
  (uint64_t(*)(const void*))(&wuffs_bmp__decoder__num_decoded_frames),
  (wuffs_base__status(*)(void*,
      uint64_t,
      uint64_t))(&wuffs_bmp__decoder__restart_frame),
  (wuffs_base__empty_struct(*)(void*,
      uint32_t,
      bool))(&wuffs_bmp__decoder__set_quirk_enabled),
  (wuffs_base__empty_struct(*)(void*,
      uint32_t,
      bool))(&wuffs_bmp__decoder__set_report_metadata),
  (wuffs_base__status(*)(void*,
      wuffs_base__io_buffer*,
      wuffs_base__more_information*,
      wuffs_base__io_buffer*))(&wuffs_bmp__decoder__tell_me_more),
  (wuffs_base__range_ii_u64(*)(const void*))(&wuffs_bmp__decoder__workbuf_len),
};

// ---------------- Initializer Implementations

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_bmp__decoder__initialize(
    wuffs_bmp__decoder* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options){
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (sizeof(*self) != sizeof_star_self) {
    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
  }
  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
  }

  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
    // The whole point of this if-check is to detect an uninitialized *self.
    // We disable the warning on GCC. Clang-5.0 does not have this warning.
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
    if (self->private_impl.magic != 0) {
      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
    }
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
  } else {
    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    } else {
      memset(&(self->private_impl), 0, sizeof(self->private_impl));
    }
  }

  self->private_impl.magic = WUFFS_BASE__MAGIC;
  self->private_impl.vtable_for__wuffs_base__image_decoder.vtable_name =
      wuffs_base__image_decoder__vtable_name;
  self->private_impl.vtable_for__wuffs_base__image_decoder.function_pointers =
      (const void*)(&wuffs_bmp__decoder__func_ptrs_for__wuffs_base__image_decoder);
  return wuffs_base__make_status(NULL);
}

wuffs_bmp__decoder*
wuffs_bmp__decoder__alloc() {
  wuffs_bmp__decoder* x =
      (wuffs_bmp__decoder*)(calloc(sizeof(wuffs_bmp__decoder), 1));
  if (!x) {
    return NULL;
  }
  if (wuffs_bmp__decoder__initialize(
      x, sizeof(wuffs_bmp__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
    free(x);
    return NULL;
  }
  return x;
}

size_t
sizeof__wuffs_bmp__decoder() {
  return sizeof(wuffs_bmp__decoder);
}

// ---------------- Function Implementations

// -------- func bmp.decoder.set_quirk_enabled

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_bmp__decoder__set_quirk_enabled(
    wuffs_bmp__decoder* self,
    uint32_t a_quirk,
    bool a_enabled) {
  return wuffs_base__make_empty_struct();
}

// -------- func bmp.decoder.decode_image_config

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_bmp__decoder__decode_image_config(
    wuffs_bmp__decoder* self,
    wuffs_base__image_config* a_dst,
    wuffs_base__io_buffer* a_src) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 1)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint32_t v_magic = 0;
  uint32_t v_width = 0;
  uint32_t v_height = 0;
  uint32_t v_planes = 0;
  uint32_t v_dst_pixfmt = 0;
  uint32_t v_byte_width = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_image_config[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if ((self->private_impl.f_call_sequence != 0) || (self->private_impl.f_io_redirect_fourcc == 1)) {
      status = wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
      goto exit;
    } else if (self->private_impl.f_io_redirect_fourcc != 0) {
      status = wuffs_base__make_status(wuffs_base__note__i_o_redirect);
      goto ok;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      uint32_t t_0;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
        t_0 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
        iop_a_src += 2;
      } else {
        self->private_data.s_decode_image_config[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
          uint32_t num_bits_0 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_0;
          if (num_bits_0 == 8) {
            t_0 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_0 += 8;
          *scratch |= ((uint64_t)(num_bits_0)) << 56;
        }
      }
      v_magic = t_0;
    }
    if (v_magic != 19778) {
      status = wuffs_base__make_status(wuffs_bmp__error__bad_header);
      goto exit;
    }
    self->private_data.s_decode_image_config[0].scratch = 8;
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
    if (self->private_data.s_decode_image_config[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
      self->private_data.s_decode_image_config[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
      iop_a_src = io2_a_src;
      status = wuffs_base__make_status(wuffs_base__suspension__short_read);
      goto suspend;
    }
    iop_a_src += self->private_data.s_decode_image_config[0].scratch;
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
      uint32_t t_1;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
        t_1 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
        iop_a_src += 4;
      } else {
        self->private_data.s_decode_image_config[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
          uint32_t num_bits_1 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_1;
          if (num_bits_1 == 24) {
            t_1 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_1 += 8;
          *scratch |= ((uint64_t)(num_bits_1)) << 56;
        }
      }
      self->private_impl.f_padding = t_1;
    }
    if (self->private_impl.f_padding < 14) {
      status = wuffs_base__make_status(wuffs_bmp__error__bad_header);
      goto exit;
    }
    self->private_impl.f_padding -= 14;
    self->private_impl.f_io_redirect_pos = wuffs_base__u64__sat_add(((uint64_t)(self->private_impl.f_padding)), wuffs_base__u64__sat_add(a_src->meta.pos, ((uint64_t)(iop_a_src - io0_a_src))));
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
      uint32_t t_2;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
        t_2 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
        iop_a_src += 4;
      } else {
        self->private_data.s_decode_image_config[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
          uint32_t num_bits_2 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_2;
          if (num_bits_2 == 24) {
            t_2 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_2 += 8;
          *scratch |= ((uint64_t)(num_bits_2)) << 56;
        }
      }
      self->private_impl.f_bitmap_info_len = t_2;
    }
    if (self->private_impl.f_padding < self->private_impl.f_bitmap_info_len) {
      status = wuffs_base__make_status(wuffs_bmp__error__bad_header);
      goto exit;
    }
    self->private_impl.f_padding -= self->private_impl.f_bitmap_info_len;
    if (self->private_impl.f_bitmap_info_len == 12) {
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
        uint32_t t_3;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
          t_3 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
          iop_a_src += 2;
        } else {
          self->private_data.s_decode_image_config[0].scratch = 0;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(9);
          while (true) {
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
            uint32_t num_bits_3 = ((uint32_t)(*scratch >> 56));
            *scratch <<= 8;
            *scratch >>= 8;
            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_3;
            if (num_bits_3 == 8) {
              t_3 = ((uint32_t)(*scratch));
              break;
            }
            num_bits_3 += 8;
            *scratch |= ((uint64_t)(num_bits_3)) << 56;
          }
        }
        self->private_impl.f_width = t_3;
      }
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(10);
        uint32_t t_4;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
          t_4 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
          iop_a_src += 2;
        } else {
          self->private_data.s_decode_image_config[0].scratch = 0;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(11);
          while (true) {
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
            uint32_t num_bits_4 = ((uint32_t)(*scratch >> 56));
            *scratch <<= 8;
            *scratch >>= 8;
            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_4;
            if (num_bits_4 == 8) {
              t_4 = ((uint32_t)(*scratch));
              break;
            }
            num_bits_4 += 8;
            *scratch |= ((uint64_t)(num_bits_4)) << 56;
          }
        }
        self->private_impl.f_height = t_4;
      }
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(12);
        uint32_t t_5;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
          t_5 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
          iop_a_src += 2;
        } else {
          self->private_data.s_decode_image_config[0].scratch = 0;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(13);
          while (true) {
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
            uint32_t num_bits_5 = ((uint32_t)(*scratch >> 56));
            *scratch <<= 8;
            *scratch >>= 8;
            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_5;
            if (num_bits_5 == 8) {
              t_5 = ((uint32_t)(*scratch));
              break;
            }
            num_bits_5 += 8;
            *scratch |= ((uint64_t)(num_bits_5)) << 56;
          }
        }
        v_planes = t_5;
      }
      if (v_planes != 1) {
        status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
        goto exit;
      }
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(14);
        uint32_t t_6;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
          t_6 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
          iop_a_src += 2;
        } else {
          self->private_data.s_decode_image_config[0].scratch = 0;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(15);
          while (true) {
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
            uint32_t num_bits_6 = ((uint32_t)(*scratch >> 56));
            *scratch <<= 8;
            *scratch >>= 8;
            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_6;
            if (num_bits_6 == 8) {
              t_6 = ((uint32_t)(*scratch));
              break;
            }
            num_bits_6 += 8;
            *scratch |= ((uint64_t)(num_bits_6)) << 56;
          }
        }
        self->private_impl.f_bits_per_pixel = t_6;
      }
    } else if (self->private_impl.f_bitmap_info_len == 16) {
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(16);
        uint32_t t_7;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
          t_7 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
          iop_a_src += 4;
        } else {
          self->private_data.s_decode_image_config[0].scratch = 0;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(17);
          while (true) {
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
            uint32_t num_bits_7 = ((uint32_t)(*scratch >> 56));
            *scratch <<= 8;
            *scratch >>= 8;
            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_7;
            if (num_bits_7 == 24) {
              t_7 = ((uint32_t)(*scratch));
              break;
            }
            num_bits_7 += 8;
            *scratch |= ((uint64_t)(num_bits_7)) << 56;
          }
        }
        v_width = t_7;
      }
      if (v_width >= 2147483648) {
        status = wuffs_base__make_status(wuffs_bmp__error__bad_header);
        goto exit;
      }
      self->private_impl.f_width = v_width;
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(18);
        uint32_t t_8;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
          t_8 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
          iop_a_src += 4;
        } else {
          self->private_data.s_decode_image_config[0].scratch = 0;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(19);
          while (true) {
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
            uint32_t num_bits_8 = ((uint32_t)(*scratch >> 56));
            *scratch <<= 8;
            *scratch >>= 8;
            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_8;
            if (num_bits_8 == 24) {
              t_8 = ((uint32_t)(*scratch));
              break;
            }
            num_bits_8 += 8;
            *scratch |= ((uint64_t)(num_bits_8)) << 56;
          }
        }
        v_height = t_8;
      }
      if (v_height >= 2147483648) {
        status = wuffs_base__make_status(wuffs_bmp__error__bad_header);
        goto exit;
      }
      self->private_impl.f_height = v_height;
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(20);
        uint32_t t_9;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
          t_9 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
          iop_a_src += 2;
        } else {
          self->private_data.s_decode_image_config[0].scratch = 0;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(21);
          while (true) {
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
            uint32_t num_bits_9 = ((uint32_t)(*scratch >> 56));
            *scratch <<= 8;
            *scratch >>= 8;
            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_9;
            if (num_bits_9 == 8) {
              t_9 = ((uint32_t)(*scratch));
              break;
            }
            num_bits_9 += 8;
            *scratch |= ((uint64_t)(num_bits_9)) << 56;
          }
        }
        v_planes = t_9;
      }
      if (v_planes != 1) {
        status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
        goto exit;
      }
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(22);
        uint32_t t_10;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
          t_10 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
          iop_a_src += 2;
        } else {
          self->private_data.s_decode_image_config[0].scratch = 0;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(23);
          while (true) {
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
            uint32_t num_bits_10 = ((uint32_t)(*scratch >> 56));
            *scratch <<= 8;
            *scratch >>= 8;
            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_10;
            if (num_bits_10 == 8) {
              t_10 = ((uint32_t)(*scratch));
              break;
            }
            num_bits_10 += 8;
            *scratch |= ((uint64_t)(num_bits_10)) << 56;
          }
        }
        self->private_impl.f_bits_per_pixel = t_10;
      }
    } else {
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(24);
        uint32_t t_11;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
          t_11 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
          iop_a_src += 4;
        } else {
          self->private_data.s_decode_image_config[0].scratch = 0;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(25);
          while (true) {
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
            uint32_t num_bits_11 = ((uint32_t)(*scratch >> 56));
            *scratch <<= 8;
            *scratch >>= 8;
            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_11;
            if (num_bits_11 == 24) {
              t_11 = ((uint32_t)(*scratch));
              break;
            }
            num_bits_11 += 8;
            *scratch |= ((uint64_t)(num_bits_11)) << 56;
          }
        }
        v_width = t_11;
      }
      if (v_width >= 2147483648) {
        status = wuffs_base__make_status(wuffs_bmp__error__bad_header);
        goto exit;
      }
      self->private_impl.f_width = v_width;
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(26);
        uint32_t t_12;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
          t_12 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
          iop_a_src += 4;
        } else {
          self->private_data.s_decode_image_config[0].scratch = 0;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(27);
          while (true) {
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
            uint32_t num_bits_12 = ((uint32_t)(*scratch >> 56));
            *scratch <<= 8;
            *scratch >>= 8;
            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_12;
            if (num_bits_12 == 24) {
              t_12 = ((uint32_t)(*scratch));
              break;
            }
            num_bits_12 += 8;
            *scratch |= ((uint64_t)(num_bits_12)) << 56;
          }
        }
        v_height = t_12;
      }
      if (v_height == 2147483648) {
        status = wuffs_base__make_status(wuffs_bmp__error__bad_header);
        goto exit;
      } else if (v_height >= 2147483648) {
        self->private_impl.f_height = (((uint32_t)(0 - v_height)) & 2147483647);
        self->private_impl.f_top_down = true;
      } else {
        self->private_impl.f_height = v_height;
      }
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(28);
        uint32_t t_13;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
          t_13 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
          iop_a_src += 2;
        } else {
          self->private_data.s_decode_image_config[0].scratch = 0;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(29);
          while (true) {
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
            uint32_t num_bits_13 = ((uint32_t)(*scratch >> 56));
            *scratch <<= 8;
            *scratch >>= 8;
            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_13;
            if (num_bits_13 == 8) {
              t_13 = ((uint32_t)(*scratch));
              break;
            }
            num_bits_13 += 8;
            *scratch |= ((uint64_t)(num_bits_13)) << 56;
          }
        }
        v_planes = t_13;
      }
      if (v_planes != 1) {
        status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
        goto exit;
      }
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(30);
        uint32_t t_14;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
          t_14 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
          iop_a_src += 2;
        } else {
          self->private_data.s_decode_image_config[0].scratch = 0;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(31);
          while (true) {
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
            uint32_t num_bits_14 = ((uint32_t)(*scratch >> 56));
            *scratch <<= 8;
            *scratch >>= 8;
            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_14;
            if (num_bits_14 == 8) {
              t_14 = ((uint32_t)(*scratch));
              break;
            }
            num_bits_14 += 8;
            *scratch |= ((uint64_t)(num_bits_14)) << 56;
          }
        }
        self->private_impl.f_bits_per_pixel = t_14;
      }
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(32);
        uint32_t t_15;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
          t_15 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
          iop_a_src += 4;
        } else {
          self->private_data.s_decode_image_config[0].scratch = 0;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(33);
          while (true) {
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
            uint32_t num_bits_15 = ((uint32_t)(*scratch >> 56));
            *scratch <<= 8;
            *scratch >>= 8;
            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_15;
            if (num_bits_15 == 24) {
              t_15 = ((uint32_t)(*scratch));
              break;
            }
            num_bits_15 += 8;
            *scratch |= ((uint64_t)(num_bits_15)) << 56;
          }
        }
        self->private_impl.f_compression = t_15;
      }
      if (self->private_impl.f_bits_per_pixel == 0) {
        if (self->private_impl.f_compression == 4) {
          self->private_impl.f_io_redirect_fourcc = 1246774599;
          status = wuffs_base__make_status(wuffs_base__note__i_o_redirect);
          goto ok;
        } else if (self->private_impl.f_compression == 5) {
          self->private_impl.f_io_redirect_fourcc = 1347307296;
          status = wuffs_base__make_status(wuffs_base__note__i_o_redirect);
          goto ok;
        }
        status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
        goto exit;
      }
      self->private_data.s_decode_image_config[0].scratch = 20;
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(34);
      if (self->private_data.s_decode_image_config[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
        self->private_data.s_decode_image_config[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
        iop_a_src = io2_a_src;
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      iop_a_src += self->private_data.s_decode_image_config[0].scratch;
      if (self->private_impl.f_bitmap_info_len == 40) {
        if (self->private_impl.f_bits_per_pixel >= 16) {
          if (self->private_impl.f_padding >= 16) {
            self->private_impl.f_bitmap_info_len = 56;
            self->private_impl.f_padding -= 16;
          } else if (self->private_impl.f_padding >= 12) {
            self->private_impl.f_bitmap_info_len = 52;
            self->private_impl.f_padding -= 12;
          }
        }
      } else if ((self->private_impl.f_bitmap_info_len != 52) &&
          (self->private_impl.f_bitmap_info_len != 56) &&
          (self->private_impl.f_bitmap_info_len != 64) &&
          (self->private_impl.f_bitmap_info_len != 108) &&
          (self->private_impl.f_bitmap_info_len != 124)) {
        status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
        goto exit;
      }
      if (self->private_impl.f_compression == 6) {
        self->private_impl.f_compression = 3;
      }
      if (self->private_impl.f_compression == 3) {
        if (self->private_impl.f_bitmap_info_len >= 52) {
          {
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(35);
            uint32_t t_16;
            if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
              t_16 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
              iop_a_src += 4;
            } else {
              self->private_data.s_decode_image_config[0].scratch = 0;
              WUFFS_BASE__COROUTINE_SUSPENSION_POINT(36);
              while (true) {
                if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
                  status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                  goto suspend;
                }
                uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
                uint32_t num_bits_16 = ((uint32_t)(*scratch >> 56));
                *scratch <<= 8;
                *scratch >>= 8;
                *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_16;
                if (num_bits_16 == 24) {
                  t_16 = ((uint32_t)(*scratch));
                  break;
                }
                num_bits_16 += 8;
                *scratch |= ((uint64_t)(num_bits_16)) << 56;
              }
            }
            self->private_impl.f_channel_masks[2] = t_16;
          }
          {
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(37);
            uint32_t t_17;
            if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
              t_17 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
              iop_a_src += 4;
            } else {
              self->private_data.s_decode_image_config[0].scratch = 0;
              WUFFS_BASE__COROUTINE_SUSPENSION_POINT(38);
              while (true) {
                if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
                  status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                  goto suspend;
                }
                uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
                uint32_t num_bits_17 = ((uint32_t)(*scratch >> 56));
                *scratch <<= 8;
                *scratch >>= 8;
                *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_17;
                if (num_bits_17 == 24) {
                  t_17 = ((uint32_t)(*scratch));
                  break;
                }
                num_bits_17 += 8;
                *scratch |= ((uint64_t)(num_bits_17)) << 56;
              }
            }
            self->private_impl.f_channel_masks[1] = t_17;
          }
          {
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(39);
            uint32_t t_18;
            if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
              t_18 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
              iop_a_src += 4;
            } else {
              self->private_data.s_decode_image_config[0].scratch = 0;
              WUFFS_BASE__COROUTINE_SUSPENSION_POINT(40);
              while (true) {
                if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
                  status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                  goto suspend;
                }
                uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
                uint32_t num_bits_18 = ((uint32_t)(*scratch >> 56));
                *scratch <<= 8;
                *scratch >>= 8;
                *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_18;
                if (num_bits_18 == 24) {
                  t_18 = ((uint32_t)(*scratch));
                  break;
                }
                num_bits_18 += 8;
                *scratch |= ((uint64_t)(num_bits_18)) << 56;
              }
            }
            self->private_impl.f_channel_masks[0] = t_18;
          }
          if (self->private_impl.f_bitmap_info_len >= 56) {
            {
              WUFFS_BASE__COROUTINE_SUSPENSION_POINT(41);
              uint32_t t_19;
              if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
                t_19 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
                iop_a_src += 4;
              } else {
                self->private_data.s_decode_image_config[0].scratch = 0;
                WUFFS_BASE__COROUTINE_SUSPENSION_POINT(42);
                while (true) {
                  if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
                    status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                    goto suspend;
                  }
                  uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
                  uint32_t num_bits_19 = ((uint32_t)(*scratch >> 56));
                  *scratch <<= 8;
                  *scratch >>= 8;
                  *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_19;
                  if (num_bits_19 == 24) {
                    t_19 = ((uint32_t)(*scratch));
                    break;
                  }
                  num_bits_19 += 8;
                  *scratch |= ((uint64_t)(num_bits_19)) << 56;
                }
              }
              self->private_impl.f_channel_masks[3] = t_19;
            }
            self->private_data.s_decode_image_config[0].scratch = ((uint32_t)(self->private_impl.f_bitmap_info_len - 56));
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(43);
            if (self->private_data.s_decode_image_config[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
              self->private_data.s_decode_image_config[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
              iop_a_src = io2_a_src;
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            iop_a_src += self->private_data.s_decode_image_config[0].scratch;
          }
          if ((self->private_impl.f_channel_masks[0] == 255) && (self->private_impl.f_channel_masks[1] == 65280) && (self->private_impl.f_channel_masks[2] == 16711680)) {
            if (self->private_impl.f_bits_per_pixel == 24) {
              self->private_impl.f_compression = 0;
            } else if (self->private_impl.f_bits_per_pixel == 32) {
              if ((self->private_impl.f_channel_masks[3] == 0) || (self->private_impl.f_channel_masks[3] == 4278190080)) {
                self->private_impl.f_compression = 0;
              }
            }
          }
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(44);
          status = wuffs_bmp__decoder__process_masks(self);
          if (status.repr) {
            goto suspend;
          }
        }
      } else if (self->private_impl.f_bitmap_info_len >= 40) {
        self->private_data.s_decode_image_config[0].scratch = (self->private_impl.f_bitmap_info_len - 40);
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(45);
        if (self->private_data.s_decode_image_config[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
          self->private_data.s_decode_image_config[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
          iop_a_src = io2_a_src;
          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
          goto suspend;
        }
        iop_a_src += self->private_data.s_decode_image_config[0].scratch;
      } else {
        status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
        goto exit;
      }
    }
    if (self->private_impl.f_compression != 3) {
      if (self->private_impl.f_bits_per_pixel < 16) {
        if (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(46);
        status = wuffs_bmp__decoder__read_palette(self, a_src);
        if (a_src) {
          iop_a_src = a_src->data.ptr + a_src->meta.ri;
        }
        if (status.repr) {
          goto suspend;
        }
      }
    }
    if (self->private_impl.f_compression == 0) {
      if ((self->private_impl.f_bits_per_pixel == 1) || (self->private_impl.f_bits_per_pixel == 2) || (self->private_impl.f_bits_per_pixel == 4)) {
        self->private_impl.f_src_pixfmt = 2198077448;
        self->private_impl.f_compression = 256;
      } else if (self->private_impl.f_bits_per_pixel == 8) {
        self->private_impl.f_src_pixfmt = 2198077448;
      } else if (self->private_impl.f_bits_per_pixel == 16) {
        self->private_impl.f_compression = 3;
        self->private_impl.f_channel_masks[0] = 31;
        self->private_impl.f_channel_masks[1] = 992;
        self->private_impl.f_channel_masks[2] = 31744;
        self->private_impl.f_channel_masks[3] = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(47);
        status = wuffs_bmp__decoder__process_masks(self);
        if (status.repr) {
          goto suspend;
        }
        self->private_impl.f_src_pixfmt = 2164308923;
      } else if (self->private_impl.f_bits_per_pixel == 24) {
        self->private_impl.f_src_pixfmt = 2147485832;
      } else if (self->private_impl.f_bits_per_pixel == 32) {
        if (self->private_impl.f_channel_masks[3] == 0) {
          self->private_impl.f_src_pixfmt = 2415954056;
        } else {
          self->private_impl.f_src_pixfmt = 2164295816;
        }
      } else {
        status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
        goto exit;
      }
    } else if (self->private_impl.f_compression == 1) {
      if (self->private_impl.f_bits_per_pixel == 8) {
        self->private_impl.f_src_pixfmt = 2198077448;
      } else {
        status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
        goto exit;
      }
    } else if (self->private_impl.f_compression == 2) {
      if (self->private_impl.f_bits_per_pixel == 4) {
        self->private_impl.f_src_pixfmt = 2198077448;
      } else {
        status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
        goto exit;
      }
    } else if (self->private_impl.f_compression == 3) {
      if ((self->private_impl.f_bits_per_pixel == 16) || (self->private_impl.f_bits_per_pixel == 32)) {
        self->private_impl.f_src_pixfmt = 2164308923;
      } else {
        status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
        goto exit;
      }
    } else {
      status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
      goto exit;
    }
    if (((self->private_impl.f_bitmap_info_len < 40) || (self->private_impl.f_bitmap_info_len == 64)) &&
        (self->private_impl.f_bits_per_pixel != 1) &&
        (self->private_impl.f_bits_per_pixel != 4) &&
        (self->private_impl.f_bits_per_pixel != 8) &&
        (self->private_impl.f_bits_per_pixel != 24)) {
      status = wuffs_base__make_status(wuffs_bmp__error__bad_header);
      goto exit;
    }
    if (self->private_impl.f_bits_per_pixel == 1) {
      v_byte_width = ((self->private_impl.f_width >> 3) + (((self->private_impl.f_width & 7) + 7) >> 3));
      self->private_impl.f_pad_per_row = ((4 - (v_byte_width & 3)) & 3);
    } else if (self->private_impl.f_bits_per_pixel == 2) {
      v_byte_width = ((self->private_impl.f_width >> 2) + (((self->private_impl.f_width & 3) + 3) >> 2));
      self->private_impl.f_pad_per_row = ((4 - (v_byte_width & 3)) & 3);
    } else if (self->private_impl.f_bits_per_pixel == 4) {
      v_byte_width = ((self->private_impl.f_width >> 1) + (self->private_impl.f_width & 1));
      self->private_impl.f_pad_per_row = ((4 - (v_byte_width & 3)) & 3);
    } else if (self->private_impl.f_bits_per_pixel == 8) {
      self->private_impl.f_pad_per_row = ((4 - (self->private_impl.f_width & 3)) & 3);
    } else if (self->private_impl.f_bits_per_pixel == 16) {
      self->private_impl.f_pad_per_row = ((self->private_impl.f_width & 1) * 2);
    } else if (self->private_impl.f_bits_per_pixel == 24) {
      self->private_impl.f_pad_per_row = (self->private_impl.f_width & 3);
    } else if (self->private_impl.f_bits_per_pixel == 32) {
      self->private_impl.f_pad_per_row = 0;
    }
    self->private_impl.f_frame_config_io_position = wuffs_base__u64__sat_add(a_src->meta.pos, ((uint64_t)(iop_a_src - io0_a_src)));
    if (a_dst != NULL) {
      v_dst_pixfmt = 2164295816;
      if ((self->private_impl.f_channel_num_bits[0] > 8) ||
          (self->private_impl.f_channel_num_bits[1] > 8) ||
          (self->private_impl.f_channel_num_bits[2] > 8) ||
          (self->private_impl.f_channel_num_bits[3] > 8)) {
        v_dst_pixfmt = 2164308923;
      }
      wuffs_base__image_config__set(
          a_dst,
          v_dst_pixfmt,
          0,
          self->private_impl.f_width,
          self->private_impl.f_height,
          self->private_impl.f_frame_config_io_position,
          (self->private_impl.f_channel_masks[3] == 0));
    }
    self->private_impl.f_call_sequence = 3;

    goto ok;
    ok:
    self->private_impl.p_decode_image_config[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_image_config[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 1 : 0;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func bmp.decoder.decode_frame_config

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_bmp__decoder__decode_frame_config(
    wuffs_bmp__decoder* self,
    wuffs_base__frame_config* a_dst,
    wuffs_base__io_buffer* a_src) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 2)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_frame_config[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_call_sequence < 3) {
      if (a_src) {
        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
      }
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      status = wuffs_bmp__decoder__decode_image_config(self, NULL, a_src);
      if (a_src) {
        iop_a_src = a_src->data.ptr + a_src->meta.ri;
      }
      if (status.repr) {
        goto suspend;
      }
    } else if (self->private_impl.f_call_sequence == 3) {
      if (self->private_impl.f_frame_config_io_position != wuffs_base__u64__sat_add(a_src->meta.pos, ((uint64_t)(iop_a_src - io0_a_src)))) {
        status = wuffs_base__make_status(wuffs_base__error__bad_restart);
        goto exit;
      }
    } else if (self->private_impl.f_call_sequence == 4) {
      self->private_impl.f_call_sequence = 255;
      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
      goto ok;
    } else {
      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
      goto ok;
    }
    if (a_dst != NULL) {
      wuffs_base__frame_config__set(
          a_dst,
          wuffs_base__utility__make_rect_ie_u32(
          0,
          0,
          self->private_impl.f_width,
          self->private_impl.f_height),
          ((wuffs_base__flicks)(0)),
          0,
          self->private_impl.f_frame_config_io_position,
          0,
          true,
          false,
          4278190080);
    }
    self->private_impl.f_call_sequence = 4;

    goto ok;
    ok:
    self->private_impl.p_decode_frame_config[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_frame_config[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 2 : 0;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func bmp.decoder.decode_frame

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_bmp__decoder__decode_frame(
    wuffs_bmp__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__pixel_blend a_blend,
    wuffs_base__slice_u8 a_workbuf,
    wuffs_base__decode_frame_options* a_opts) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_dst || !a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 3)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  wuffs_base__status v_status = wuffs_base__make_status(NULL);

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_frame[0];
  if (coro_susp_point) {
    v_status = self->private_data.s_decode_frame[0].v_status;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_call_sequence < 4) {
      if (a_src) {
        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
      }
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      status = wuffs_bmp__decoder__decode_frame_config(self, NULL, a_src);
      if (a_src) {
        iop_a_src = a_src->data.ptr + a_src->meta.ri;
      }
      if (status.repr) {
        goto suspend;
      }
    } else if (self->private_impl.f_call_sequence == 4) {
    } else {
      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
      goto ok;
    }
    self->private_data.s_decode_frame[0].scratch = self->private_impl.f_padding;
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
    if (self->private_data.s_decode_frame[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
      self->private_data.s_decode_frame[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
      iop_a_src = io2_a_src;
      status = wuffs_base__make_status(wuffs_base__suspension__short_read);
      goto suspend;
    }
    iop_a_src += self->private_data.s_decode_frame[0].scratch;
    if ((self->private_impl.f_width > 0) && (self->private_impl.f_height > 0)) {
      self->private_impl.f_dst_x = 0;
      if (self->private_impl.f_top_down) {
        self->private_impl.f_dst_y = 0;
        self->private_impl.f_dst_y_inc = 1;
      } else {
        self->private_impl.f_dst_y = ((uint32_t)(self->private_impl.f_height - 1));
        self->private_impl.f_dst_y_inc = 4294967295;
      }
      v_status = wuffs_base__pixel_swizzler__prepare(&self->private_impl.f_swizzler,
          wuffs_base__pixel_buffer__pixel_format(a_dst),
          wuffs_base__pixel_buffer__palette_or_else(a_dst, wuffs_base__make_slice_u8((self->private_data.f_scratch) + 1024, 1024)),
          wuffs_base__utility__make_pixel_format(self->private_impl.f_src_pixfmt),
          wuffs_base__make_slice_u8(self->private_data.f_src_palette, 1024),
          a_blend);
      if ( ! wuffs_base__status__is_ok(&v_status)) {
        status = v_status;
        if (wuffs_base__status__is_error(&status)) {
          goto exit;
        } else if (wuffs_base__status__is_suspension(&status)) {
          status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
          goto exit;
        }
        goto ok;
      }
      while (true) {
        if (self->private_impl.f_compression == 0) {
          if (a_src) {
            a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
          }
          v_status = wuffs_bmp__decoder__swizzle_none(self, a_dst, a_src);
          if (a_src) {
            iop_a_src = a_src->data.ptr + a_src->meta.ri;
          }
        } else if (self->private_impl.f_compression < 3) {
          if (a_src) {
            a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
          }
          v_status = wuffs_bmp__decoder__swizzle_rle(self, a_dst, a_src);
          if (a_src) {
            iop_a_src = a_src->data.ptr + a_src->meta.ri;
          }
        } else if (self->private_impl.f_compression == 3) {
          if (a_src) {
            a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
          }
          v_status = wuffs_bmp__decoder__swizzle_bitfields(self, a_dst, a_src);
          if (a_src) {
            iop_a_src = a_src->data.ptr + a_src->meta.ri;
          }
        } else {
          if (a_src) {
            a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
          }
          v_status = wuffs_bmp__decoder__swizzle_low_bit_depth(self, a_dst, a_src);
          if (a_src) {
            iop_a_src = a_src->data.ptr + a_src->meta.ri;
          }
        }
        if (wuffs_base__status__is_ok(&v_status)) {
          goto label__0__break;
        } else if (v_status.repr != wuffs_bmp__note__internal_note_short_read) {
          status = v_status;
          if (wuffs_base__status__is_error(&status)) {
            goto exit;
          } else if (wuffs_base__status__is_suspension(&status)) {
            status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
            goto exit;
          }
          goto ok;
        }
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(3);
      }
      label__0__break:;
      self->private_data.s_decode_frame[0].scratch = self->private_impl.f_pending_pad;
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
      if (self->private_data.s_decode_frame[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
        self->private_data.s_decode_frame[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
        iop_a_src = io2_a_src;
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      iop_a_src += self->private_data.s_decode_frame[0].scratch;
      self->private_impl.f_pending_pad = 0;
    }
    self->private_impl.f_call_sequence = 255;

    goto ok;
    ok:
    self->private_impl.p_decode_frame[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_frame[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 3 : 0;
  self->private_data.s_decode_frame[0].v_status = v_status;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func bmp.decoder.swizzle_none

static wuffs_base__status
wuffs_bmp__decoder__swizzle_none(
    wuffs_bmp__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  wuffs_base__pixel_format v_dst_pixfmt = {0};
  uint32_t v_dst_bits_per_pixel = 0;
  uint64_t v_dst_bytes_per_pixel = 0;
  uint64_t v_dst_bytes_per_row = 0;
  wuffs_base__slice_u8 v_dst_palette = {0};
  wuffs_base__table_u8 v_tab = {0};
  wuffs_base__slice_u8 v_dst = {0};
  uint64_t v_i = 0;
  uint64_t v_n = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  v_dst_pixfmt = wuffs_base__pixel_buffer__pixel_format(a_dst);
  v_dst_bits_per_pixel = wuffs_base__pixel_format__bits_per_pixel(&v_dst_pixfmt);
  if ((v_dst_bits_per_pixel & 7) != 0) {
    status = wuffs_base__make_status(wuffs_base__error__unsupported_option);
    goto exit;
  }
  v_dst_bytes_per_pixel = ((uint64_t)((v_dst_bits_per_pixel / 8)));
  v_dst_bytes_per_row = (((uint64_t)(self->private_impl.f_width)) * v_dst_bytes_per_pixel);
  v_dst_palette = wuffs_base__pixel_buffer__palette_or_else(a_dst, wuffs_base__make_slice_u8((self->private_data.f_scratch) + 1024, 1024));
  v_tab = wuffs_base__pixel_buffer__plane(a_dst, 0);
  label__outer__continue:;
  while (true) {
    while (self->private_impl.f_pending_pad > 0) {
      if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
        status = wuffs_base__make_status(wuffs_bmp__note__internal_note_short_read);
        goto ok;
      }
      self->private_impl.f_pending_pad -= 1;
      iop_a_src += 1;
    }
    label__inner__continue:;
    while (true) {
      if (self->private_impl.f_dst_x == self->private_impl.f_width) {
        self->private_impl.f_dst_x = 0;
        self->private_impl.f_dst_y += self->private_impl.f_dst_y_inc;
        if (self->private_impl.f_dst_y >= self->private_impl.f_height) {
          if (self->private_impl.f_height > 0) {
            self->private_impl.f_pending_pad = self->private_impl.f_pad_per_row;
          }
          goto label__outer__break;
        } else if (self->private_impl.f_pad_per_row != 0) {
          self->private_impl.f_pending_pad = self->private_impl.f_pad_per_row;
          goto label__outer__continue;
        }
      }
      v_dst = wuffs_base__table_u8__row(v_tab, self->private_impl.f_dst_y);
      if (v_dst_bytes_per_row < ((uint64_t)(v_dst.len))) {
        v_dst = wuffs_base__slice_u8__subslice_j(v_dst, v_dst_bytes_per_row);
      }
      v_i = (((uint64_t)(self->private_impl.f_dst_x)) * v_dst_bytes_per_pixel);
      if (v_i >= ((uint64_t)(v_dst.len))) {
        goto label__inner__continue;
      }
      v_n = wuffs_base__pixel_swizzler__swizzle_interleaved_from_reader(
          &self->private_impl.f_swizzler,
          wuffs_base__slice_u8__subslice_i(v_dst, v_i),
          v_dst_palette,
          &iop_a_src,
          io2_a_src);
      if (v_n == 0) {
        status = wuffs_base__make_status(wuffs_bmp__note__internal_note_short_read);
        goto ok;
      }
      wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x, ((uint32_t)((v_n & 4294967295))));
    }
  }
  label__outer__break:;
  status = wuffs_base__make_status(NULL);
  goto ok;

  goto ok;
  ok:
  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func bmp.decoder.swizzle_rle

static wuffs_base__status
wuffs_bmp__decoder__swizzle_rle(
    wuffs_bmp__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  wuffs_base__pixel_format v_dst_pixfmt = {0};
  uint32_t v_dst_bits_per_pixel = 0;
  uint64_t v_dst_bytes_per_pixel = 0;
  uint64_t v_dst_bytes_per_row = 0;
  wuffs_base__slice_u8 v_dst_palette = {0};
  wuffs_base__table_u8 v_tab = {0};
  wuffs_base__slice_u8 v_row = {0};
  wuffs_base__slice_u8 v_dst = {0};
  uint64_t v_i = 0;
  uint64_t v_n = 0;
  uint32_t v_p0 = 0;
  uint8_t v_code = 0;
  uint8_t v_indexes[2] = {0};
  uint32_t v_rle_state = 0;
  uint32_t v_chunk_bits = 0;
  uint32_t v_chunk_count = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  v_dst_pixfmt = wuffs_base__pixel_buffer__pixel_format(a_dst);
  v_dst_bits_per_pixel = wuffs_base__pixel_format__bits_per_pixel(&v_dst_pixfmt);
  if ((v_dst_bits_per_pixel & 7) != 0) {
    status = wuffs_base__make_status(wuffs_base__error__unsupported_option);
    goto exit;
  }
  v_dst_bytes_per_pixel = ((uint64_t)((v_dst_bits_per_pixel / 8)));
  v_dst_bytes_per_row = (((uint64_t)(self->private_impl.f_width)) * v_dst_bytes_per_pixel);
  v_dst_palette = wuffs_base__pixel_buffer__palette_or_else(a_dst, wuffs_base__make_slice_u8((self->private_data.f_scratch) + 1024, 1024));
  v_tab = wuffs_base__pixel_buffer__plane(a_dst, 0);
  v_rle_state = self->private_impl.f_rle_state;
  label__outer__continue:;
  while (true) {
    v_row = wuffs_base__table_u8__row(v_tab, self->private_impl.f_dst_y);
    if (v_dst_bytes_per_row < ((uint64_t)(v_row.len))) {
      v_row = wuffs_base__slice_u8__subslice_j(v_row, v_dst_bytes_per_row);
    }
    label__middle__continue:;
    while (true) {
      v_i = (((uint64_t)(self->private_impl.f_dst_x)) * v_dst_bytes_per_pixel);
      if (v_i <= ((uint64_t)(v_row.len))) {
        v_dst = wuffs_base__slice_u8__subslice_i(v_row, v_i);
      } else {
        v_dst = wuffs_base__utility__empty_slice_u8();
      }
      while (true) {
        label__inner__continue:;
        while (true) {
          if (v_rle_state == 0) {
            if (((uint64_t)(io2_a_src - iop_a_src)) < 1) {
              goto label__goto_suspend__break;
            }
            v_code = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
            iop_a_src += 1;
            if (v_code == 0) {
              v_rle_state = 2;
              goto label__inner__continue;
            }
            self->private_impl.f_rle_length = ((uint32_t)(v_code));
            v_rle_state = 1;
            goto label__inner__continue;
          } else if (v_rle_state == 1) {
            if (((uint64_t)(io2_a_src - iop_a_src)) < 1) {
              goto label__goto_suspend__break;
            }
            v_code = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
            iop_a_src += 1;
            if (self->private_impl.f_bits_per_pixel == 8) {
              v_p0 = 0;
              while (v_p0 < self->private_impl.f_rle_length) {
                self->private_data.f_scratch[v_p0] = v_code;
                v_p0 += 1;
              }
            } else {
              v_indexes[0] = ((uint8_t)((v_code >> 4)));
              v_indexes[1] = (v_code & 15);
              v_p0 = 0;
              while (v_p0 < self->private_impl.f_rle_length) {
                self->private_data.f_scratch[(v_p0 + 0)] = v_indexes[0];
                self->private_data.f_scratch[(v_p0 + 1)] = v_indexes[1];
                v_p0 += 2;
              }
            }
            wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, v_dst, v_dst_palette, wuffs_base__slice_u8__subslice_j(wuffs_base__make_slice_u8(self->private_data.f_scratch, 2048), self->private_impl.f_rle_length));
            wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x, self->private_impl.f_rle_length);
            v_rle_state = 0;
            goto label__middle__continue;
          } else if (v_rle_state == 2) {
            if (((uint64_t)(io2_a_src - iop_a_src)) < 1) {
              goto label__goto_suspend__break;
            }
            v_code = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
            iop_a_src += 1;
            if (v_code < 2) {
              if ((self->private_impl.f_dst_y >= self->private_impl.f_height) && (v_code == 0)) {
                status = wuffs_base__make_status(wuffs_bmp__error__bad_rle_compression);
                goto exit;
              }
              wuffs_base__pixel_swizzler__swizzle_interleaved_transparent_black(&self->private_impl.f_swizzler, v_dst, v_dst_palette, 18446744073709551615u);
              self->private_impl.f_dst_x = 0;
              self->private_impl.f_dst_y += self->private_impl.f_dst_y_inc;
              if (v_code > 0) {
                goto label__outer__break;
              }
              v_rle_state = 0;
              goto label__outer__continue;
            } else if (v_code == 2) {
              v_rle_state = 4;
              goto label__inner__continue;
            }
            self->private_impl.f_rle_length = ((uint32_t)(v_code));
            self->private_impl.f_rle_padded = ((self->private_impl.f_bits_per_pixel == 8) && ((v_code & 1) != 0));
            v_rle_state = 3;
            goto label__inner__continue;
          } else if (v_rle_state == 3) {
            if (self->private_impl.f_bits_per_pixel == 8) {
              v_n = wuffs_base__pixel_swizzler__limited_swizzle_u32_interleaved_from_reader(
                  &self->private_impl.f_swizzler,
                  self->private_impl.f_rle_length,
                  v_dst,
                  v_dst_palette,
                  &iop_a_src,
                  io2_a_src);
              wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x, ((uint32_t)((v_n & 4294967295))));
              wuffs_base__u32__sat_sub_indirect(&self->private_impl.f_rle_length, ((uint32_t)((v_n & 4294967295))));
            } else {
              v_chunk_count = ((self->private_impl.f_rle_length + 3) / 4);
              v_p0 = 0;
              while ((v_chunk_count > 0) && (((uint64_t)(io2_a_src - iop_a_src)) >= 2)) {
                v_chunk_bits = ((uint32_t)(wuffs_base__peek_u16be__no_bounds_check(iop_a_src)));
                iop_a_src += 2;
                self->private_data.f_scratch[(v_p0 + 0)] = ((uint8_t)((15 & (v_chunk_bits >> 12))));
                self->private_data.f_scratch[(v_p0 + 1)] = ((uint8_t)((15 & (v_chunk_bits >> 8))));
                self->private_data.f_scratch[(v_p0 + 2)] = ((uint8_t)((15 & (v_chunk_bits >> 4))));
                self->private_data.f_scratch[(v_p0 + 3)] = ((uint8_t)((15 & (v_chunk_bits >> 0))));
                v_p0 = ((v_p0 & 255) + 4);
                v_chunk_count -= 1;
              }
              v_p0 = wuffs_base__u32__min(v_p0, self->private_impl.f_rle_length);
              wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, v_dst, v_dst_palette, wuffs_base__slice_u8__subslice_j(wuffs_base__make_slice_u8(self->private_data.f_scratch, 2048), v_p0));
              wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x, v_p0);
              wuffs_base__u32__sat_sub_indirect(&self->private_impl.f_rle_length, v_p0);
            }
            if (self->private_impl.f_rle_length > 0) {
              goto label__goto_suspend__break;
            }
            if (self->private_impl.f_rle_padded) {
              if (((uint64_t)(io2_a_src - iop_a_src)) < 1) {
                goto label__goto_suspend__break;
              }
              iop_a_src += 1;
              self->private_impl.f_rle_padded = false;
            }
            v_rle_state = 0;
            goto label__middle__continue;
          } else if (v_rle_state == 4) {
            if (((uint64_t)(io2_a_src - iop_a_src)) < 1) {
              goto label__goto_suspend__break;
            }
            self->private_impl.f_rle_delta_x = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
            iop_a_src += 1;
            v_rle_state = 5;
            goto label__inner__continue;
          }
          if (((uint64_t)(io2_a_src - iop_a_src)) < 1) {
            goto label__goto_suspend__break;
          }
          v_code = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
          iop_a_src += 1;
          if (self->private_impl.f_rle_delta_x > 0) {
            wuffs_base__pixel_swizzler__swizzle_interleaved_transparent_black(&self->private_impl.f_swizzler, v_dst, v_dst_palette, ((uint64_t)(self->private_impl.f_rle_delta_x)));
            wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x, ((uint32_t)(self->private_impl.f_rle_delta_x)));
            self->private_impl.f_rle_delta_x = 0;
            if (self->private_impl.f_dst_x > self->private_impl.f_width) {
              status = wuffs_base__make_status(wuffs_bmp__error__bad_rle_compression);
              goto exit;
            }
          }
          if (v_code > 0) {
#if defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wconversion"
#endif
            v_code -= 1;
#if defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
            while (true) {
              self->private_impl.f_dst_y += self->private_impl.f_dst_y_inc;
              if (self->private_impl.f_dst_y >= self->private_impl.f_height) {
                status = wuffs_base__make_status(wuffs_bmp__error__bad_rle_compression);
                goto exit;
              }
              v_row = wuffs_base__table_u8__row(v_tab, self->private_impl.f_dst_y);
              if (v_dst_bytes_per_row < ((uint64_t)(v_row.len))) {
                v_row = wuffs_base__slice_u8__subslice_j(v_row, v_dst_bytes_per_row);
              }
              if (v_code <= 0) {
                wuffs_base__pixel_swizzler__swizzle_interleaved_transparent_black(&self->private_impl.f_swizzler, v_row, v_dst_palette, ((uint64_t)(self->private_impl.f_dst_x)));
                goto label__0__break;
              }
              wuffs_base__pixel_swizzler__swizzle_interleaved_transparent_black(&self->private_impl.f_swizzler, v_row, v_dst_palette, 18446744073709551615u);
#if defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wconversion"
#endif
              v_code -= 1;
#if defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
            }
            label__0__break:;
          }
          v_rle_state = 0;
          goto label__middle__continue;
        }
      }
      label__goto_suspend__break:;
      self->private_impl.f_rle_state = v_rle_state;
      status = wuffs_base__make_status(wuffs_bmp__note__internal_note_short_read);
      goto ok;
    }
  }
  label__outer__break:;
  while (self->private_impl.f_dst_y < self->private_impl.f_height) {
    v_row = wuffs_base__table_u8__row(v_tab, self->private_impl.f_dst_y);
    if (v_dst_bytes_per_row < ((uint64_t)(v_row.len))) {
      v_row = wuffs_base__slice_u8__subslice_j(v_row, v_dst_bytes_per_row);
    }
    wuffs_base__pixel_swizzler__swizzle_interleaved_transparent_black(&self->private_impl.f_swizzler, v_row, v_dst_palette, 18446744073709551615u);
    self->private_impl.f_dst_y += self->private_impl.f_dst_y_inc;
  }
  status = wuffs_base__make_status(NULL);
  goto ok;

  goto ok;
  ok:
  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func bmp.decoder.swizzle_bitfields

static wuffs_base__status
wuffs_bmp__decoder__swizzle_bitfields(
    wuffs_bmp__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  wuffs_base__pixel_format v_dst_pixfmt = {0};
  uint32_t v_dst_bits_per_pixel = 0;
  uint64_t v_dst_bytes_per_pixel = 0;
  uint64_t v_dst_bytes_per_row = 0;
  wuffs_base__slice_u8 v_dst_palette = {0};
  wuffs_base__table_u8 v_tab = {0};
  wuffs_base__slice_u8 v_dst = {0};
  uint64_t v_i = 0;
  uint64_t v_n = 0;
  uint32_t v_p0 = 0;
  uint32_t v_p1 = 0;
  uint32_t v_p1_temp = 0;
  uint32_t v_num_bits = 0;
  uint32_t v_c = 0;
  uint32_t v_c32 = 0;
  uint32_t v_channel = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  v_dst_pixfmt = wuffs_base__pixel_buffer__pixel_format(a_dst);
  v_dst_bits_per_pixel = wuffs_base__pixel_format__bits_per_pixel(&v_dst_pixfmt);
  if ((v_dst_bits_per_pixel & 7) != 0) {
    status = wuffs_base__make_status(wuffs_base__error__unsupported_option);
    goto exit;
  }
  v_dst_bytes_per_pixel = ((uint64_t)((v_dst_bits_per_pixel / 8)));
  v_dst_bytes_per_row = (((uint64_t)(self->private_impl.f_width)) * v_dst_bytes_per_pixel);
  v_dst_palette = wuffs_base__pixel_buffer__palette_or_else(a_dst, wuffs_base__make_slice_u8((self->private_data.f_scratch) + 1024, 1024));
  v_tab = wuffs_base__pixel_buffer__plane(a_dst, 0);
  label__outer__continue:;
  while (true) {
    while (self->private_impl.f_pending_pad > 0) {
      if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
        status = wuffs_base__make_status(wuffs_bmp__note__internal_note_short_read);
        goto ok;
      }
      self->private_impl.f_pending_pad -= 1;
      iop_a_src += 1;
    }
    label__inner__continue:;
    while (true) {
      if (self->private_impl.f_dst_x == self->private_impl.f_width) {
        self->private_impl.f_dst_x = 0;
        self->private_impl.f_dst_y += self->private_impl.f_dst_y_inc;
        if (self->private_impl.f_dst_y >= self->private_impl.f_height) {
          if (self->private_impl.f_height > 0) {
            self->private_impl.f_pending_pad = self->private_impl.f_pad_per_row;
          }
          goto label__outer__break;
        } else if (self->private_impl.f_pad_per_row != 0) {
          self->private_impl.f_pending_pad = self->private_impl.f_pad_per_row;
          goto label__outer__continue;
        }
      }
      v_p1_temp = ((uint32_t)(self->private_impl.f_width - self->private_impl.f_dst_x));
      v_p1 = wuffs_base__u32__min(v_p1_temp, 256);
      v_p0 = 0;
      while (v_p0 < v_p1) {
        if (self->private_impl.f_bits_per_pixel == 16) {
          if (((uint64_t)(io2_a_src - iop_a_src)) < 2) {
            goto label__0__break;
          }
          v_c32 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
          iop_a_src += 2;
        } else {
          if (((uint64_t)(io2_a_src - iop_a_src)) < 4) {
            goto label__0__break;
          }
          v_c32 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
          iop_a_src += 4;
        }
        v_channel = 0;
        while (v_channel < 4) {
          if (self->private_impl.f_channel_num_bits[v_channel] == 0) {
            self->private_data.f_scratch[((8 * v_p0) + (2 * v_channel) + 0)] = 255;
            self->private_data.f_scratch[((8 * v_p0) + (2 * v_channel) + 1)] = 255;
          } else {
            v_c = ((v_c32 & self->private_impl.f_channel_masks[v_channel]) >> self->private_impl.f_channel_shifts[v_channel]);
            v_num_bits = ((uint32_t)(self->private_impl.f_channel_num_bits[v_channel]));
            while (v_num_bits < 16) {
              v_c |= ((uint32_t)(v_c << v_num_bits));
              v_num_bits *= 2;
            }
            v_c >>= (v_num_bits - 16);
            self->private_data.f_scratch[((8 * v_p0) + (2 * v_channel) + 0)] = ((uint8_t)((255 & (v_c >> 0))));
            self->private_data.f_scratch[((8 * v_p0) + (2 * v_channel) + 1)] = ((uint8_t)((255 & (v_c >> 8))));
          }
          v_channel += 1;
        }
        v_p0 += 1;
      }
      label__0__break:;
      v_dst = wuffs_base__table_u8__row(v_tab, self->private_impl.f_dst_y);
      if (v_dst_bytes_per_row < ((uint64_t)(v_dst.len))) {
        v_dst = wuffs_base__slice_u8__subslice_j(v_dst, v_dst_bytes_per_row);
      }
      v_i = (((uint64_t)(self->private_impl.f_dst_x)) * v_dst_bytes_per_pixel);
      if (v_i >= ((uint64_t)(v_dst.len))) {
        goto label__inner__continue;
      }
      v_n = wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, wuffs_base__slice_u8__subslice_i(v_dst, v_i), v_dst_palette, wuffs_base__slice_u8__subslice_j(wuffs_base__make_slice_u8(self->private_data.f_scratch, 2048), (8 * v_p0)));
      if (v_n == 0) {
        status = wuffs_base__make_status(wuffs_bmp__note__internal_note_short_read);
        goto ok;
      }
      wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x, ((uint32_t)((v_n & 4294967295))));
    }
  }
  label__outer__break:;
  status = wuffs_base__make_status(NULL);
  goto ok;

  goto ok;
  ok:
  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func bmp.decoder.swizzle_low_bit_depth

static wuffs_base__status
wuffs_bmp__decoder__swizzle_low_bit_depth(
    wuffs_bmp__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  wuffs_base__pixel_format v_dst_pixfmt = {0};
  uint32_t v_dst_bits_per_pixel = 0;
  uint64_t v_dst_bytes_per_pixel = 0;
  uint64_t v_dst_bytes_per_row = 0;
  wuffs_base__slice_u8 v_dst_palette = {0};
  wuffs_base__table_u8 v_tab = {0};
  wuffs_base__slice_u8 v_dst = {0};
  uint64_t v_i = 0;
  uint64_t v_n = 0;
  uint32_t v_p0 = 0;
  uint32_t v_chunk_bits = 0;
  uint32_t v_chunk_count = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  v_dst_pixfmt = wuffs_base__pixel_buffer__pixel_format(a_dst);
  v_dst_bits_per_pixel = wuffs_base__pixel_format__bits_per_pixel(&v_dst_pixfmt);
  if ((v_dst_bits_per_pixel & 7) != 0) {
    status = wuffs_base__make_status(wuffs_base__error__unsupported_option);
    goto exit;
  }
  v_dst_bytes_per_pixel = ((uint64_t)((v_dst_bits_per_pixel / 8)));
  v_dst_bytes_per_row = (((uint64_t)(self->private_impl.f_width)) * v_dst_bytes_per_pixel);
  v_dst_palette = wuffs_base__pixel_buffer__palette_or_else(a_dst, wuffs_base__make_slice_u8((self->private_data.f_scratch) + 1024, 1024));
  v_tab = wuffs_base__pixel_buffer__plane(a_dst, 0);
  label__loop__continue:;
  while (true) {
    if (self->private_impl.f_dst_x == self->private_impl.f_width) {
      self->private_impl.f_dst_x = 0;
      self->private_impl.f_dst_y += self->private_impl.f_dst_y_inc;
      if (self->private_impl.f_dst_y >= self->private_impl.f_height) {
        goto label__loop__break;
      }
    }
    v_dst = wuffs_base__table_u8__row(v_tab, self->private_impl.f_dst_y);
    if (v_dst_bytes_per_row < ((uint64_t)(v_dst.len))) {
      v_dst = wuffs_base__slice_u8__subslice_j(v_dst, v_dst_bytes_per_row);
    }
    v_i = (((uint64_t)(self->private_impl.f_dst_x)) * v_dst_bytes_per_pixel);
    if (v_i >= ((uint64_t)(v_dst.len))) {
      goto label__loop__continue;
    }
    v_dst = wuffs_base__slice_u8__subslice_i(v_dst, v_i);
    v_p0 = 0;
    if (self->private_impl.f_bits_per_pixel == 1) {
      v_chunk_count = ((wuffs_base__u32__sat_sub(self->private_impl.f_width, self->private_impl.f_dst_x) + 31) / 32);
      v_chunk_count = wuffs_base__u32__min(v_chunk_count, 16);
      while ((v_chunk_count > 0) && (((uint64_t)(io2_a_src - iop_a_src)) >= 4)) {
        v_chunk_bits = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
        iop_a_src += 4;
        self->private_data.f_scratch[(v_p0 + 0)] = ((uint8_t)((1 & (v_chunk_bits >> 31))));
        self->private_data.f_scratch[(v_p0 + 1)] = ((uint8_t)((1 & (v_chunk_bits >> 30))));
        self->private_data.f_scratch[(v_p0 + 2)] = ((uint8_t)((1 & (v_chunk_bits >> 29))));
        self->private_data.f_scratch[(v_p0 + 3)] = ((uint8_t)((1 & (v_chunk_bits >> 28))));
        self->private_data.f_scratch[(v_p0 + 4)] = ((uint8_t)((1 & (v_chunk_bits >> 27))));
        self->private_data.f_scratch[(v_p0 + 5)] = ((uint8_t)((1 & (v_chunk_bits >> 26))));
        self->private_data.f_scratch[(v_p0 + 6)] = ((uint8_t)((1 & (v_chunk_bits >> 25))));
        self->private_data.f_scratch[(v_p0 + 7)] = ((uint8_t)((1 & (v_chunk_bits >> 24))));
        self->private_data.f_scratch[(v_p0 + 8)] = ((uint8_t)((1 & (v_chunk_bits >> 23))));
        self->private_data.f_scratch[(v_p0 + 9)] = ((uint8_t)((1 & (v_chunk_bits >> 22))));
        self->private_data.f_scratch[(v_p0 + 10)] = ((uint8_t)((1 & (v_chunk_bits >> 21))));
        self->private_data.f_scratch[(v_p0 + 11)] = ((uint8_t)((1 & (v_chunk_bits >> 20))));
        self->private_data.f_scratch[(v_p0 + 12)] = ((uint8_t)((1 & (v_chunk_bits >> 19))));
        self->private_data.f_scratch[(v_p0 + 13)] = ((uint8_t)((1 & (v_chunk_bits >> 18))));
        self->private_data.f_scratch[(v_p0 + 14)] = ((uint8_t)((1 & (v_chunk_bits >> 17))));
        self->private_data.f_scratch[(v_p0 + 15)] = ((uint8_t)((1 & (v_chunk_bits >> 16))));
        self->private_data.f_scratch[(v_p0 + 16)] = ((uint8_t)((1 & (v_chunk_bits >> 15))));
        self->private_data.f_scratch[(v_p0 + 17)] = ((uint8_t)((1 & (v_chunk_bits >> 14))));
        self->private_data.f_scratch[(v_p0 + 18)] = ((uint8_t)((1 & (v_chunk_bits >> 13))));
        self->private_data.f_scratch[(v_p0 + 19)] = ((uint8_t)((1 & (v_chunk_bits >> 12))));
        self->private_data.f_scratch[(v_p0 + 20)] = ((uint8_t)((1 & (v_chunk_bits >> 11))));
        self->private_data.f_scratch[(v_p0 + 21)] = ((uint8_t)((1 & (v_chunk_bits >> 10))));
        self->private_data.f_scratch[(v_p0 + 22)] = ((uint8_t)((1 & (v_chunk_bits >> 9))));
        self->private_data.f_scratch[(v_p0 + 23)] = ((uint8_t)((1 & (v_chunk_bits >> 8))));
        self->private_data.f_scratch[(v_p0 + 24)] = ((uint8_t)((1 & (v_chunk_bits >> 7))));
        self->private_data.f_scratch[(v_p0 + 25)] = ((uint8_t)((1 & (v_chunk_bits >> 6))));
        self->private_data.f_scratch[(v_p0 + 26)] = ((uint8_t)((1 & (v_chunk_bits >> 5))));
        self->private_data.f_scratch[(v_p0 + 27)] = ((uint8_t)((1 & (v_chunk_bits >> 4))));
        self->private_data.f_scratch[(v_p0 + 28)] = ((uint8_t)((1 & (v_chunk_bits >> 3))));
        self->private_data.f_scratch[(v_p0 + 29)] = ((uint8_t)((1 & (v_chunk_bits >> 2))));
        self->private_data.f_scratch[(v_p0 + 30)] = ((uint8_t)((1 & (v_chunk_bits >> 1))));
        self->private_data.f_scratch[(v_p0 + 31)] = ((uint8_t)((1 & (v_chunk_bits >> 0))));
        v_p0 = ((v_p0 & 511) + 32);
        v_chunk_count -= 1;
      }
    } else if (self->private_impl.f_bits_per_pixel == 2) {
      v_chunk_count = ((wuffs_base__u32__sat_sub(self->private_impl.f_width, self->private_impl.f_dst_x) + 15) / 16);
      v_chunk_count = wuffs_base__u32__min(v_chunk_count, 32);
      while ((v_chunk_count > 0) && (((uint64_t)(io2_a_src - iop_a_src)) >= 4)) {
        v_chunk_bits = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
        iop_a_src += 4;
        self->private_data.f_scratch[(v_p0 + 0)] = ((uint8_t)((3 & (v_chunk_bits >> 30))));
        self->private_data.f_scratch[(v_p0 + 1)] = ((uint8_t)((3 & (v_chunk_bits >> 28))));
        self->private_data.f_scratch[(v_p0 + 2)] = ((uint8_t)((3 & (v_chunk_bits >> 26))));
        self->private_data.f_scratch[(v_p0 + 3)] = ((uint8_t)((3 & (v_chunk_bits >> 24))));
        self->private_data.f_scratch[(v_p0 + 4)] = ((uint8_t)((3 & (v_chunk_bits >> 22))));
        self->private_data.f_scratch[(v_p0 + 5)] = ((uint8_t)((3 & (v_chunk_bits >> 20))));
        self->private_data.f_scratch[(v_p0 + 6)] = ((uint8_t)((3 & (v_chunk_bits >> 18))));
        self->private_data.f_scratch[(v_p0 + 7)] = ((uint8_t)((3 & (v_chunk_bits >> 16))));
        self->private_data.f_scratch[(v_p0 + 8)] = ((uint8_t)((3 & (v_chunk_bits >> 14))));
        self->private_data.f_scratch[(v_p0 + 9)] = ((uint8_t)((3 & (v_chunk_bits >> 12))));
        self->private_data.f_scratch[(v_p0 + 10)] = ((uint8_t)((3 & (v_chunk_bits >> 10))));
        self->private_data.f_scratch[(v_p0 + 11)] = ((uint8_t)((3 & (v_chunk_bits >> 8))));
        self->private_data.f_scratch[(v_p0 + 12)] = ((uint8_t)((3 & (v_chunk_bits >> 6))));
        self->private_data.f_scratch[(v_p0 + 13)] = ((uint8_t)((3 & (v_chunk_bits >> 4))));
        self->private_data.f_scratch[(v_p0 + 14)] = ((uint8_t)((3 & (v_chunk_bits >> 2))));
        self->private_data.f_scratch[(v_p0 + 15)] = ((uint8_t)((3 & (v_chunk_bits >> 0))));
        v_p0 = ((v_p0 & 511) + 16);
        v_chunk_count -= 1;
      }
    } else if (self->private_impl.f_bits_per_pixel == 4) {
      v_chunk_count = ((wuffs_base__u32__sat_sub(self->private_impl.f_width, self->private_impl.f_dst_x) + 7) / 8);
      v_chunk_count = wuffs_base__u32__min(v_chunk_count, 64);
      while ((v_chunk_count > 0) && (((uint64_t)(io2_a_src - iop_a_src)) >= 4)) {
        v_chunk_bits = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
        iop_a_src += 4;
        self->private_data.f_scratch[(v_p0 + 0)] = ((uint8_t)((15 & (v_chunk_bits >> 28))));
        self->private_data.f_scratch[(v_p0 + 1)] = ((uint8_t)((15 & (v_chunk_bits >> 24))));
        self->private_data.f_scratch[(v_p0 + 2)] = ((uint8_t)((15 & (v_chunk_bits >> 20))));
        self->private_data.f_scratch[(v_p0 + 3)] = ((uint8_t)((15 & (v_chunk_bits >> 16))));
        self->private_data.f_scratch[(v_p0 + 4)] = ((uint8_t)((15 & (v_chunk_bits >> 12))));
        self->private_data.f_scratch[(v_p0 + 5)] = ((uint8_t)((15 & (v_chunk_bits >> 8))));
        self->private_data.f_scratch[(v_p0 + 6)] = ((uint8_t)((15 & (v_chunk_bits >> 4))));
        self->private_data.f_scratch[(v_p0 + 7)] = ((uint8_t)((15 & (v_chunk_bits >> 0))));
        v_p0 = ((v_p0 & 511) + 8);
        v_chunk_count -= 1;
      }
    }
    v_p0 = wuffs_base__u32__min(v_p0, wuffs_base__u32__sat_sub(self->private_impl.f_width, self->private_impl.f_dst_x));
    v_n = wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, v_dst, v_dst_palette, wuffs_base__slice_u8__subslice_j(wuffs_base__make_slice_u8(self->private_data.f_scratch, 2048), v_p0));
    if (v_n == 0) {
      status = wuffs_base__make_status(wuffs_bmp__note__internal_note_short_read);
      goto ok;
    }
    wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x, ((uint32_t)((v_n & 4294967295))));
  }
  label__loop__break:;
  status = wuffs_base__make_status(NULL);
  goto ok;

  goto ok;
  ok:
  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func bmp.decoder.frame_dirty_rect

WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
wuffs_bmp__decoder__frame_dirty_rect(
    const wuffs_bmp__decoder* self) {
  if (!self) {
    return wuffs_base__utility__empty_rect_ie_u32();
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__empty_rect_ie_u32();
  }

  return wuffs_base__utility__make_rect_ie_u32(
      0,
      0,
      self->private_impl.f_width,
      self->private_impl.f_height);
}

// -------- func bmp.decoder.num_animation_loops

WUFFS_BASE__MAYBE_STATIC uint32_t
wuffs_bmp__decoder__num_animation_loops(
    const wuffs_bmp__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  return 0;
}

// -------- func bmp.decoder.num_decoded_frame_configs

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_bmp__decoder__num_decoded_frame_configs(
    const wuffs_bmp__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  if (self->private_impl.f_call_sequence > 3) {
    return 1;
  }
  return 0;
}

// -------- func bmp.decoder.num_decoded_frames

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_bmp__decoder__num_decoded_frames(
    const wuffs_bmp__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  if (self->private_impl.f_call_sequence > 4) {
    return 1;
  }
  return 0;
}

// -------- func bmp.decoder.restart_frame

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_bmp__decoder__restart_frame(
    wuffs_bmp__decoder* self,
    uint64_t a_index,
    uint64_t a_io_position) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }

  if (self->private_impl.f_call_sequence < 3) {
    return wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
  }
  if (a_index != 0) {
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  self->private_impl.f_call_sequence = 3;
  self->private_impl.f_frame_config_io_position = a_io_position;
  return wuffs_base__make_status(NULL);
}

// -------- func bmp.decoder.set_report_metadata

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_bmp__decoder__set_report_metadata(
    wuffs_bmp__decoder* self,
    uint32_t a_fourcc,
    bool a_report) {
  return wuffs_base__make_empty_struct();
}

// -------- func bmp.decoder.tell_me_more

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_bmp__decoder__tell_me_more(
    wuffs_bmp__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__more_information* a_minfo,
    wuffs_base__io_buffer* a_src) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_dst || !a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 4)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  if (self->private_impl.f_io_redirect_fourcc <= 1) {
    status = wuffs_base__make_status(wuffs_base__error__no_more_information);
    goto exit;
  }
  if (a_minfo != NULL) {
    wuffs_base__more_information__set(a_minfo,
        1,
        self->private_impl.f_io_redirect_fourcc,
        0,
        self->private_impl.f_io_redirect_pos,
        18446744073709551615u);
  }
  self->private_impl.f_io_redirect_fourcc = 1;

  goto ok;
  ok:
  goto exit;
  exit:
  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func bmp.decoder.workbuf_len

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_bmp__decoder__workbuf_len(
    const wuffs_bmp__decoder* self) {
  if (!self) {
    return wuffs_base__utility__empty_range_ii_u64();
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__empty_range_ii_u64();
  }

  return wuffs_base__utility__make_range_ii_u64(0, 0);
}

// -------- func bmp.decoder.read_palette

static wuffs_base__status
wuffs_bmp__decoder__read_palette(
    wuffs_bmp__decoder* self,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint32_t v_i = 0;
  uint32_t v_argb = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_read_palette[0];
  if (coro_susp_point) {
    v_i = self->private_data.s_read_palette[0].v_i;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_bitmap_info_len == 12) {
      while ((v_i < 256) && (self->private_impl.f_padding >= 3)) {
        self->private_impl.f_padding -= 3;
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
          uint32_t t_0;
          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 3)) {
            t_0 = ((uint32_t)(wuffs_base__peek_u24le__no_bounds_check(iop_a_src)));
            iop_a_src += 3;
          } else {
            self->private_data.s_read_palette[0].scratch = 0;
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
            while (true) {
              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                goto suspend;
              }
              uint64_t* scratch = &self->private_data.s_read_palette[0].scratch;
              uint32_t num_bits_0 = ((uint32_t)(*scratch >> 56));
              *scratch <<= 8;
              *scratch >>= 8;
              *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_0;
              if (num_bits_0 == 16) {
                t_0 = ((uint32_t)(*scratch));
                break;
              }
              num_bits_0 += 8;
              *scratch |= ((uint64_t)(num_bits_0)) << 56;
            }
          }
          v_argb = t_0;
        }
        v_argb |= 4278190080;
        self->private_data.f_src_palette[((4 * v_i) + 0)] = ((uint8_t)(((v_argb >> 0) & 255)));
        self->private_data.f_src_palette[((4 * v_i) + 1)] = ((uint8_t)(((v_argb >> 8) & 255)));
        self->private_data.f_src_palette[((4 * v_i) + 2)] = ((uint8_t)(((v_argb >> 16) & 255)));
        self->private_data.f_src_palette[((4 * v_i) + 3)] = ((uint8_t)(((v_argb >> 24) & 255)));
        v_i += 1;
      }
    } else {
      while ((v_i < 256) && (self->private_impl.f_padding >= 4)) {
        self->private_impl.f_padding -= 4;
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
          uint32_t t_1;
          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
            t_1 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
            iop_a_src += 4;
          } else {
            self->private_data.s_read_palette[0].scratch = 0;
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
            while (true) {
              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                goto suspend;
              }
              uint64_t* scratch = &self->private_data.s_read_palette[0].scratch;
              uint32_t num_bits_1 = ((uint32_t)(*scratch >> 56));
              *scratch <<= 8;
              *scratch >>= 8;
              *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_1;
              if (num_bits_1 == 24) {
                t_1 = ((uint32_t)(*scratch));
                break;
              }
              num_bits_1 += 8;
              *scratch |= ((uint64_t)(num_bits_1)) << 56;
            }
          }
          v_argb = t_1;
        }
        v_argb |= 4278190080;
        self->private_data.f_src_palette[((4 * v_i) + 0)] = ((uint8_t)(((v_argb >> 0) & 255)));
        self->private_data.f_src_palette[((4 * v_i) + 1)] = ((uint8_t)(((v_argb >> 8) & 255)));
        self->private_data.f_src_palette[((4 * v_i) + 2)] = ((uint8_t)(((v_argb >> 16) & 255)));
        self->private_data.f_src_palette[((4 * v_i) + 3)] = ((uint8_t)(((v_argb >> 24) & 255)));
        v_i += 1;
      }
    }
    while (v_i < 256) {
      self->private_data.f_src_palette[((4 * v_i) + 0)] = 0;
      self->private_data.f_src_palette[((4 * v_i) + 1)] = 0;
      self->private_data.f_src_palette[((4 * v_i) + 2)] = 0;
      self->private_data.f_src_palette[((4 * v_i) + 3)] = 255;
      v_i += 1;
    }

    goto ok;
    ok:
    self->private_impl.p_read_palette[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_read_palette[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_data.s_read_palette[0].v_i = v_i;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func bmp.decoder.process_masks

static wuffs_base__status
wuffs_bmp__decoder__process_masks(
    wuffs_bmp__decoder* self) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint32_t v_i = 0;
  uint32_t v_mask = 0;
  uint32_t v_n = 0;

  while (v_i < 4) {
    v_mask = self->private_impl.f_channel_masks[v_i];
    if (v_mask != 0) {
      v_n = 0;
      while ((v_mask & 1) == 0) {
        v_n += 1;
        v_mask >>= 1;
      }
      self->private_impl.f_channel_shifts[v_i] = ((uint8_t)((v_n & 31)));
      v_n = 0;
      while ((v_mask & 1) == 1) {
        v_n += 1;
        v_mask >>= 1;
      }
      if ((v_mask != 0) || (v_n > 32)) {
        status = wuffs_base__make_status(wuffs_bmp__error__bad_header);
        goto exit;
      }
      self->private_impl.f_channel_num_bits[v_i] = ((uint8_t)(v_n));
    } else if (v_i != 3) {
      status = wuffs_base__make_status(wuffs_bmp__error__bad_header);
      goto exit;
    }
    v_i += 1;
  }

  goto ok;
  ok:
  goto exit;
  exit:
  return status;
}

#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BMP)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__CBOR)

// ---------------- Status Codes Implementations

const char wuffs_cbor__error__bad_input[] = "#cbor: bad input";
const char wuffs_cbor__error__unsupported_recursion_depth[] = "#cbor: unsupported recursion depth";
const char wuffs_cbor__error__internal_error_inconsistent_i_o[] = "#cbor: internal error: inconsistent I/O";
const char wuffs_cbor__error__internal_error_inconsistent_token_length[] = "#cbor: internal error: inconsistent token length";

// ---------------- Private Consts

static const uint32_t
WUFFS_CBOR__LITERALS[4] WUFFS_BASE__POTENTIALLY_UNUSED = {
  8388612, 8388616, 8388610, 8388609,
};

static const uint8_t
WUFFS_CBOR__TOKEN_LENGTHS[32] WUFFS_BASE__POTENTIALLY_UNUSED = {
  1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1,
  2, 3, 5, 9, 0, 0, 0, 1,
};

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

// ---------------- VTables

const wuffs_base__token_decoder__func_ptrs
wuffs_cbor__decoder__func_ptrs_for__wuffs_base__token_decoder = {
  (wuffs_base__status(*)(void*,
      wuffs_base__token_buffer*,
      wuffs_base__io_buffer*,
      wuffs_base__slice_u8))(&wuffs_cbor__decoder__decode_tokens),
  (wuffs_base__empty_struct(*)(void*,
      uint32_t,
      bool))(&wuffs_cbor__decoder__set_quirk_enabled),
  (wuffs_base__range_ii_u64(*)(const void*))(&wuffs_cbor__decoder__workbuf_len),
};

// ---------------- Initializer Implementations

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_cbor__decoder__initialize(
    wuffs_cbor__decoder* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options){
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (sizeof(*self) != sizeof_star_self) {
    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
  }
  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
  }

  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
    // The whole point of this if-check is to detect an uninitialized *self.
    // We disable the warning on GCC. Clang-5.0 does not have this warning.
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
    if (self->private_impl.magic != 0) {
      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
    }
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
  } else {
    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    } else {
      memset(&(self->private_impl), 0, sizeof(self->private_impl));
    }
  }

  self->private_impl.magic = WUFFS_BASE__MAGIC;
  self->private_impl.vtable_for__wuffs_base__token_decoder.vtable_name =
      wuffs_base__token_decoder__vtable_name;
  self->private_impl.vtable_for__wuffs_base__token_decoder.function_pointers =
      (const void*)(&wuffs_cbor__decoder__func_ptrs_for__wuffs_base__token_decoder);
  return wuffs_base__make_status(NULL);
}

wuffs_cbor__decoder*
wuffs_cbor__decoder__alloc() {
  wuffs_cbor__decoder* x =
      (wuffs_cbor__decoder*)(calloc(sizeof(wuffs_cbor__decoder), 1));
  if (!x) {
    return NULL;
  }
  if (wuffs_cbor__decoder__initialize(
      x, sizeof(wuffs_cbor__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
    free(x);
    return NULL;
  }
  return x;
}

size_t
sizeof__wuffs_cbor__decoder() {
  return sizeof(wuffs_cbor__decoder);
}

// ---------------- Function Implementations

// -------- func cbor.decoder.set_quirk_enabled

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_cbor__decoder__set_quirk_enabled(
    wuffs_cbor__decoder* self,
    uint32_t a_quirk,
    bool a_enabled) {
  return wuffs_base__make_empty_struct();
}

// -------- func cbor.decoder.workbuf_len

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_cbor__decoder__workbuf_len(
    const wuffs_cbor__decoder* self) {
  if (!self) {
    return wuffs_base__utility__empty_range_ii_u64();
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__empty_range_ii_u64();
  }

  return wuffs_base__utility__empty_range_ii_u64();
}

// -------- func cbor.decoder.decode_tokens

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_cbor__decoder__decode_tokens(
    wuffs_cbor__decoder* self,
    wuffs_base__token_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__slice_u8 a_workbuf) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_dst || !a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 1)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint64_t v_string_length = 0;
  uint64_t v_n64 = 0;
  uint32_t v_depth = 0;
  uint32_t v_stack_byte = 0;
  uint32_t v_stack_bit = 0;
  uint32_t v_stack_val = 0;
  uint32_t v_token_length = 0;
  uint32_t v_vminor = 0;
  uint32_t v_vminor_alt = 0;
  uint32_t v_continued = 0;
  uint8_t v_c = 0;
  uint8_t v_c_major = 0;
  uint8_t v_c_minor = 0;
  bool v_tagged = false;
  uint8_t v_indefinite_string_major_type = 0;

  wuffs_base__token* iop_a_dst = NULL;
  wuffs_base__token* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  wuffs_base__token* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  wuffs_base__token* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_dst) {
    io0_a_dst = a_dst->data.ptr;
    io1_a_dst = io0_a_dst + a_dst->meta.wi;
    iop_a_dst = io1_a_dst;
    io2_a_dst = io0_a_dst + a_dst->data.len;
    if (a_dst->meta.closed) {
      io2_a_dst = iop_a_dst;
    }
  }
  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_tokens[0];
  if (coro_susp_point) {
    v_string_length = self->private_data.s_decode_tokens[0].v_string_length;
    v_depth = self->private_data.s_decode_tokens[0].v_depth;
    v_token_length = self->private_data.s_decode_tokens[0].v_token_length;
    v_tagged = self->private_data.s_decode_tokens[0].v_tagged;
    v_indefinite_string_major_type = self->private_data.s_decode_tokens[0].v_indefinite_string_major_type;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_end_of_data) {
      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
      goto ok;
    }
    label__outer__continue:;
    while (true) {
      while (true) {
        while (true) {
          if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 1) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_write);
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
            goto label__outer__continue;
          }
          if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
            if (a_src && a_src->meta.closed) {
              status = wuffs_base__make_status(wuffs_cbor__error__bad_input);
              goto exit;
            }
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
            goto label__outer__continue;
          }
          v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
          if ((v_indefinite_string_major_type != 0) && (v_indefinite_string_major_type != (v_c >> 5))) {
            if (v_c != 255) {
              status = wuffs_base__make_status(wuffs_cbor__error__bad_input);
              goto exit;
            }
            v_vminor = 4194560;
            if (v_indefinite_string_major_type == 3) {
              v_vminor |= 19;
            }
            v_indefinite_string_major_type = 0;
            iop_a_src += 1;
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(v_vminor)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            goto label__goto_parsed_a_leaf_value__break;
          }
          iop_a_src += 1;
          v_c_major = ((uint8_t)((v_c >> 5)));
          v_c_minor = (v_c & 31);
          if (v_c_minor < 24) {
            v_string_length = ((uint64_t)(v_c_minor));
          } else {
            while (true) {
              if (v_c_minor == 24) {
                if (((uint64_t)(io2_a_src - iop_a_src)) >= 1) {
                  v_string_length = ((uint64_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src)));
                  iop_a_src += 1;
                  goto label__goto_have_string_length__break;
                }
              } else if (v_c_minor == 25) {
                if (((uint64_t)(io2_a_src - iop_a_src)) >= 2) {
                  v_string_length = ((uint64_t)(wuffs_base__peek_u16be__no_bounds_check(iop_a_src)));
                  iop_a_src += 2;
                  goto label__goto_have_string_length__break;
                }
              } else if (v_c_minor == 26) {
                if (((uint64_t)(io2_a_src - iop_a_src)) >= 4) {
                  v_string_length = ((uint64_t)(wuffs_base__peek_u32be__no_bounds_check(iop_a_src)));
                  iop_a_src += 4;
                  goto label__goto_have_string_length__break;
                }
              } else if (v_c_minor == 27) {
                if (((uint64_t)(io2_a_src - iop_a_src)) >= 8) {
                  v_string_length = wuffs_base__peek_u64be__no_bounds_check(iop_a_src);
                  iop_a_src += 8;
                  goto label__goto_have_string_length__break;
                }
              } else {
                v_string_length = 0;
                goto label__goto_have_string_length__break;
              }
              if (iop_a_src > io1_a_src) {
                iop_a_src--;
                if (a_src && a_src->meta.closed) {
                  status = wuffs_base__make_status(wuffs_cbor__error__bad_input);
                  goto exit;
                }
                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(3);
                v_c_major = 0;
                v_c_minor = 0;
                goto label__outer__continue;
              }
              status = wuffs_base__make_status(wuffs_cbor__error__internal_error_inconsistent_i_o);
              goto exit;
            }
            label__goto_have_string_length__break:;
          }
          if (v_c_major == 0) {
            if (v_c_minor < 26) {
              *iop_a_dst++ = wuffs_base__make_token(
                  (((uint64_t)((14680064 | ((uint32_t)((v_string_length & 65535)))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                  (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
              goto label__goto_parsed_a_leaf_value__break;
            } else if (v_c_minor < 28) {
              *iop_a_dst++ = wuffs_base__make_token(
                  (((uint64_t)((14680064 | ((uint32_t)((v_string_length >> 46)))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                  (((uint64_t)(0)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
              *iop_a_dst++ = wuffs_base__make_token(
                  (~(v_string_length & 70368744177663) << WUFFS_BASE__TOKEN__VALUE_EXTENSION__SHIFT) |
                  (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
              goto label__goto_parsed_a_leaf_value__break;
            }
          } else if (v_c_major == 1) {
            if (v_c_minor < 26) {
              *iop_a_dst++ = wuffs_base__make_token(
                  (((uint64_t)((12582912 | (2097151 - ((uint32_t)((v_string_length & 65535))))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                  (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
              goto label__goto_parsed_a_leaf_value__break;
            } else if (v_c_minor < 28) {
              if (v_string_length < 9223372036854775808u) {
                *iop_a_dst++ = wuffs_base__make_token(
                    (((uint64_t)((12582912 | (2097151 - ((uint32_t)((v_string_length >> 46))))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                    (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                    (((uint64_t)(0)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                *iop_a_dst++ = wuffs_base__make_token(
                    (~((18446744073709551615u - v_string_length) & 70368744177663) << WUFFS_BASE__TOKEN__VALUE_EXTENSION__SHIFT) |
                    (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
              } else {
                *iop_a_dst++ = wuffs_base__make_token(
                    (((uint64_t)(787997)) << WUFFS_BASE__TOKEN__VALUE_MAJOR__SHIFT) |
                    (((uint64_t)(16777216)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                    (((uint64_t)(9)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
              }
              goto label__goto_parsed_a_leaf_value__break;
            }
          } else if (v_c_major == 2) {
            if (v_c_minor < 28) {
              if (v_string_length == 0) {
                *iop_a_dst++ = wuffs_base__make_token(
                    (((uint64_t)(4194560)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                    (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                goto label__goto_parsed_a_leaf_value__break;
              }
              *iop_a_dst++ = wuffs_base__make_token(
                  (((uint64_t)(4194560)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                  (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            } else if (v_c_minor == 31) {
              if (v_indefinite_string_major_type != 0) {
                goto label__goto_fail__break;
              }
              v_indefinite_string_major_type = 2;
              *iop_a_dst++ = wuffs_base__make_token(
                  (((uint64_t)(4194560)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
              goto label__outer__continue;
            } else {
              goto label__goto_fail__break;
            }
            label__0__continue:;
            while (true) {
              if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
                status = wuffs_base__make_status(wuffs_base__suspension__short_write);
                WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(4);
                goto label__0__continue;
              }
              v_n64 = wuffs_base__u64__min(v_string_length, ((uint64_t)(io2_a_src - iop_a_src)));
              v_token_length = ((uint32_t)((v_n64 & 65535)));
              if (v_n64 > 65535) {
                v_token_length = 65535;
              } else if (v_token_length <= 0) {
                if (a_src && a_src->meta.closed) {
                  status = wuffs_base__make_status(wuffs_cbor__error__bad_input);
                  goto exit;
                }
                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(5);
                goto label__0__continue;
              }
              if (((uint64_t)(io2_a_src - iop_a_src)) < ((uint64_t)(v_token_length))) {
                status = wuffs_base__make_status(wuffs_cbor__error__internal_error_inconsistent_token_length);
                goto exit;
              }
              v_string_length -= ((uint64_t)(v_token_length));
              v_continued = 0;
              if ((v_string_length > 0) || (v_indefinite_string_major_type > 0)) {
                v_continued = 1;
              }
              iop_a_src += v_token_length;
              *iop_a_dst++ = wuffs_base__make_token(
                  (((uint64_t)(4194816)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                  (((uint64_t)(v_continued)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                  (((uint64_t)(v_token_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
              if (v_string_length > 0) {
                goto label__0__continue;
              } else if (v_indefinite_string_major_type > 0) {
                goto label__outer__continue;
              }
              goto label__goto_parsed_a_leaf_value__break;
            }
          } else if (v_c_major == 3) {
            if (v_c_minor < 28) {
              if (v_string_length == 0) {
                *iop_a_dst++ = wuffs_base__make_token(
                    (((uint64_t)(4194579)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                    (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                goto label__goto_parsed_a_leaf_value__break;
              }
              *iop_a_dst++ = wuffs_base__make_token(
                  (((uint64_t)(4194579)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                  (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            } else if (v_c_minor == 31) {
              if (v_indefinite_string_major_type != 0) {
                goto label__goto_fail__break;
              }
              v_indefinite_string_major_type = 3;
              *iop_a_dst++ = wuffs_base__make_token(
                  (((uint64_t)(4194579)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
              goto label__outer__continue;
            } else {
              goto label__goto_fail__break;
            }
            label__1__continue:;
            while (true) {
              if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
                status = wuffs_base__make_status(wuffs_base__suspension__short_write);
                WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(6);
                goto label__1__continue;
              }
              v_n64 = wuffs_base__u64__min(v_string_length, 65535);
              v_n64 = ((uint64_t)(wuffs_base__utf_8__longest_valid_prefix(iop_a_src,
                  ((size_t)(wuffs_base__u64__min(((uint64_t)(io2_a_src - iop_a_src)), v_n64))))));
              v_token_length = ((uint32_t)((v_n64 & 65535)));
              if (v_token_length <= 0) {
                if ((a_src && a_src->meta.closed) || (((uint64_t)(io2_a_src - iop_a_src)) >= 4)) {
                  status = wuffs_base__make_status(wuffs_cbor__error__bad_input);
                  goto exit;
                }
                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(7);
                goto label__1__continue;
              }
              if (((uint64_t)(io2_a_src - iop_a_src)) < ((uint64_t)(v_token_length))) {
                status = wuffs_base__make_status(wuffs_cbor__error__internal_error_inconsistent_token_length);
                goto exit;
              }
              v_string_length -= ((uint64_t)(v_token_length));
              v_continued = 0;
              if ((v_string_length > 0) || (v_indefinite_string_major_type > 0)) {
                v_continued = 1;
              }
              iop_a_src += v_token_length;
              *iop_a_dst++ = wuffs_base__make_token(
                  (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                  (((uint64_t)(v_continued)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                  (((uint64_t)(v_token_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
              if (v_string_length > 0) {
                goto label__1__continue;
              } else if (v_indefinite_string_major_type > 0) {
                goto label__outer__continue;
              }
              goto label__goto_parsed_a_leaf_value__break;
            }
          } else if (v_c_major == 4) {
            if (WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor] == 0) {
              goto label__goto_fail__break;
            } else if (v_depth >= 1024) {
              v_token_length = ((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor]));
              while ((v_token_length > 0) && (iop_a_src > io1_a_src)) {
                iop_a_src--;
                v_token_length -= 1;
              }
              status = wuffs_base__make_status(wuffs_cbor__error__unsupported_recursion_depth);
              goto exit;
            }
            v_vminor = 2105361;
            v_vminor_alt = 2101282;
            if (v_depth > 0) {
              v_stack_byte = ((v_depth - 1) / 16);
              v_stack_bit = (((v_depth - 1) & 15) * 2);
              if (0 == (self->private_data.f_stack[v_stack_byte] & (((uint32_t)(1)) << v_stack_bit))) {
                v_vminor = 2105377;
                v_vminor_alt = 2105378;
              } else {
                v_vminor = 2105409;
                v_vminor_alt = 2113570;
              }
            }
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(v_vminor)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            if (v_c_minor == 0) {
              *iop_a_dst++ = wuffs_base__make_token(
                  (((uint64_t)(v_vminor_alt)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                  (((uint64_t)(0)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
              goto label__goto_parsed_a_leaf_value__break;
            }
            v_stack_byte = (v_depth / 16);
            v_stack_bit = ((v_depth & 15) * 2);
            self->private_data.f_stack[v_stack_byte] &= (4294967295 ^ (((uint32_t)(3)) << v_stack_bit));
            self->private_data.f_container_num_remaining[v_depth] = v_string_length;
            v_depth += 1;
            v_tagged = false;
            goto label__outer__continue;
          } else if (v_c_major == 5) {
            if (WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor] == 0) {
              goto label__goto_fail__break;
            } else if (v_depth >= 1024) {
              v_token_length = ((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor]));
              while ((v_token_length > 0) && (iop_a_src > io1_a_src)) {
                iop_a_src--;
                v_token_length -= 1;
              }
              status = wuffs_base__make_status(wuffs_cbor__error__unsupported_recursion_depth);
              goto exit;
            }
            v_vminor = 2113553;
            v_vminor_alt = 2101314;
            if (v_depth > 0) {
              v_stack_byte = ((v_depth - 1) / 16);
              v_stack_bit = (((v_depth - 1) & 15) * 2);
              if (0 == (self->private_data.f_stack[v_stack_byte] & (((uint32_t)(1)) << v_stack_bit))) {
                v_vminor = 2113569;
                v_vminor_alt = 2105410;
              } else {
                v_vminor = 2113601;
                v_vminor_alt = 2113602;
              }
            }
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(v_vminor)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            if (v_c_minor == 0) {
              *iop_a_dst++ = wuffs_base__make_token(
                  (((uint64_t)(v_vminor_alt)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                  (((uint64_t)(0)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
              goto label__goto_parsed_a_leaf_value__break;
            }
            v_stack_byte = (v_depth / 16);
            v_stack_bit = ((v_depth & 15) * 2);
            self->private_data.f_stack[v_stack_byte] |= (((uint32_t)(3)) << v_stack_bit);
            self->private_data.f_container_num_remaining[v_depth] = v_string_length;
            v_depth += 1;
            v_tagged = false;
            goto label__outer__continue;
          } else if (v_c_major == 6) {
            if (v_c_minor >= 28) {
              goto label__goto_fail__break;
            }
            if (v_string_length < 262144) {
              *iop_a_dst++ = wuffs_base__make_token(
                  (((uint64_t)(787997)) << WUFFS_BASE__TOKEN__VALUE_MAJOR__SHIFT) |
                  (((uint64_t)((4194304 | ((uint32_t)(v_string_length))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                  (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            } else {
              *iop_a_dst++ = wuffs_base__make_token(
                  (((uint64_t)(787997)) << WUFFS_BASE__TOKEN__VALUE_MAJOR__SHIFT) |
                  (((uint64_t)((4194304 | ((uint32_t)((v_string_length >> 46)))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                  (((uint64_t)(0)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
              *iop_a_dst++ = wuffs_base__make_token(
                  (~(v_string_length & 70368744177663) << WUFFS_BASE__TOKEN__VALUE_EXTENSION__SHIFT) |
                  (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            }
            v_tagged = true;
            goto label__outer__continue;
          } else if (v_c_major == 7) {
            if (v_c_minor < 20) {
              *iop_a_dst++ = wuffs_base__make_token(
                  (((uint64_t)(787997)) << WUFFS_BASE__TOKEN__VALUE_MAJOR__SHIFT) |
                  (((uint64_t)((8388608 | ((uint32_t)((v_string_length & 255)))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
              goto label__goto_parsed_a_leaf_value__break;
            } else if (v_c_minor < 24) {
              *iop_a_dst++ = wuffs_base__make_token(
                  (((uint64_t)(WUFFS_CBOR__LITERALS[(v_c_minor & 3)])) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
              goto label__goto_parsed_a_leaf_value__break;
            } else if (v_c_minor == 24) {
              if (v_string_length < 24) {
                if ( ! (iop_a_src > io1_a_src)) {
                  status = wuffs_base__make_status(wuffs_cbor__error__internal_error_inconsistent_i_o);
                  goto exit;
                }
                iop_a_src--;
                goto label__goto_fail__break;
              }
              *iop_a_dst++ = wuffs_base__make_token(
                  (((uint64_t)(787997)) << WUFFS_BASE__TOKEN__VALUE_MAJOR__SHIFT) |
                  (((uint64_t)((8388608 | ((uint32_t)((v_string_length & 255)))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                  (((uint64_t)(2)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
              goto label__goto_parsed_a_leaf_value__break;
            } else if (v_c_minor < 28) {
              *iop_a_dst++ = wuffs_base__make_token(
                  (((uint64_t)(10490113)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                  (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
              goto label__goto_parsed_a_leaf_value__break;
            } else if (v_c_minor == 31) {
              if (v_tagged || (v_depth <= 0)) {
                goto label__goto_fail__break;
              }
              v_depth -= 1;
              if (self->private_data.f_container_num_remaining[v_depth] != 0) {
                goto label__goto_fail__break;
              }
              v_stack_byte = (v_depth / 16);
              v_stack_bit = ((v_depth & 15) * 2);
              v_stack_val = (3 & (self->private_data.f_stack[v_stack_byte] >> v_stack_bit));
              if (v_stack_val == 1) {
                goto label__goto_fail__break;
              }
              if (v_stack_val != 3) {
                v_vminor_alt = 2097186;
              } else {
                v_vminor_alt = 2097218;
              }
              if (v_depth <= 0) {
                v_vminor_alt |= 4096;
              } else {
                v_stack_byte = ((v_depth - 1) / 16);
                v_stack_bit = (((v_depth - 1) & 15) * 2);
                if (0 == (self->private_data.f_stack[v_stack_byte] & (((uint32_t)(1)) << v_stack_bit))) {
                  v_vminor_alt |= 8192;
                } else {
                  v_vminor_alt |= 16384;
                }
              }
              *iop_a_dst++ = wuffs_base__make_token(
                  (((uint64_t)(v_vminor_alt)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
              goto label__goto_parsed_a_leaf_value__break;
            }
          }
          goto label__goto_fail__break;
        }
        label__goto_fail__break:;
        if (iop_a_src > io1_a_src) {
          iop_a_src--;
          status = wuffs_base__make_status(wuffs_cbor__error__bad_input);
          goto exit;
        }
        status = wuffs_base__make_status(wuffs_cbor__error__internal_error_inconsistent_i_o);
        goto exit;
      }
      label__goto_parsed_a_leaf_value__break:;
      v_tagged = false;
      while (v_depth > 0) {
        v_stack_byte = ((v_depth - 1) / 16);
        v_stack_bit = (((v_depth - 1) & 15) * 2);
        self->private_data.f_stack[v_stack_byte] ^= (((uint32_t)(1)) << (v_stack_bit + 1));
        if (1 == (3 & (self->private_data.f_stack[v_stack_byte] >> v_stack_bit))) {
          goto label__outer__continue;
        }
        if (self->private_data.f_container_num_remaining[(v_depth - 1)] <= 0) {
          goto label__outer__continue;
        }
        self->private_data.f_container_num_remaining[(v_depth - 1)] -= 1;
        if (self->private_data.f_container_num_remaining[(v_depth - 1)] > 0) {
          goto label__outer__continue;
        }
        label__2__continue:;
        while (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
          status = wuffs_base__make_status(wuffs_base__suspension__short_write);
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(8);
          goto label__2__continue;
        }
        v_depth -= 1;
        v_stack_byte = (v_depth / 16);
        v_stack_bit = ((v_depth & 15) * 2);
        if (0 == (self->private_data.f_stack[v_stack_byte] & (((uint32_t)(1)) << v_stack_bit))) {
          v_vminor_alt = 2097186;
        } else {
          v_vminor_alt = 2097218;
        }
        if (v_depth <= 0) {
          v_vminor_alt |= 4096;
        } else {
          v_stack_byte = ((v_depth - 1) / 16);
          v_stack_bit = (((v_depth - 1) & 15) * 2);
          if (0 == (self->private_data.f_stack[v_stack_byte] & (((uint32_t)(1)) << v_stack_bit))) {
            v_vminor_alt |= 8192;
          } else {
            v_vminor_alt |= 16384;
          }
        }
        *iop_a_dst++ = wuffs_base__make_token(
            (((uint64_t)(v_vminor_alt)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
            (((uint64_t)(0)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
      }
      goto label__outer__break;
    }
    label__outer__break:;
    self->private_impl.f_end_of_data = true;

    goto ok;
    ok:
    self->private_impl.p_decode_tokens[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_tokens[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 1 : 0;
  self->private_data.s_decode_tokens[0].v_string_length = v_string_length;
  self->private_data.s_decode_tokens[0].v_depth = v_depth;
  self->private_data.s_decode_tokens[0].v_token_length = v_token_length;
  self->private_data.s_decode_tokens[0].v_tagged = v_tagged;
  self->private_data.s_decode_tokens[0].v_indefinite_string_major_type = v_indefinite_string_major_type;

  goto exit;
  exit:
  if (a_dst) {
    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
  }
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__CBOR)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__CRC32)

// ---------------- Status Codes Implementations

// ---------------- Private Consts

static const uint32_t
WUFFS_CRC32__IEEE_TABLE[16][256] WUFFS_BASE__POTENTIALLY_UNUSED = {
  {
    0, 1996959894, 3993919788, 2567524794, 124634137, 1886057615, 3915621685, 2657392035,
    249268274, 2044508324, 3772115230, 2547177864, 162941995, 2125561021, 3887607047, 2428444049,
    498536548, 1789927666, 4089016648, 2227061214, 450548861, 1843258603, 4107580753, 2211677639,
    325883990, 1684777152, 4251122042, 2321926636, 335633487, 1661365465, 4195302755, 2366115317,
    997073096, 1281953886, 3579855332, 2724688242, 1006888145, 1258607687, 3524101629, 2768942443,
    901097722, 1119000684, 3686517206, 2898065728, 853044451, 1172266101, 3705015759, 2882616665,
    651767980, 1373503546, 3369554304, 3218104598, 565507253, 1454621731, 3485111705, 3099436303,
    671266974, 1594198024, 3322730930, 2970347812, 795835527, 1483230225, 3244367275, 3060149565,
    1994146192, 31158534, 2563907772, 4023717930, 1907459465, 112637215, 2680153253, 3904427059,
    2013776290, 251722036, 2517215374, 3775830040, 2137656763, 141376813, 2439277719, 3865271297,
    1802195444, 476864866, 2238001368, 4066508878, 1812370925, 453092731, 2181625025, 4111451223,
    1706088902, 314042704, 2344532202, 4240017532, 1658658271, 366619977, 2362670323, 4224994405,
    1303535960, 984961486, 2747007092, 3569037538, 1256170817, 1037604311, 2765210733, 3554079995,
    1131014506, 879679996, 2909243462, 3663771856, 1141124467, 855842277, 2852801631, 3708648649,
    1342533948, 654459306, 3188396048, 3373015174, 1466479909, 544179635, 3110523913, 3462522015,
    1591671054, 702138776, 2966460450, 3352799412, 1504918807, 783551873, 3082640443, 3233442989,
    3988292384, 2596254646, 62317068, 1957810842, 3939845945, 2647816111, 81470997, 1943803523,
    3814918930, 2489596804, 225274430, 2053790376, 3826175755, 2466906013, 167816743, 2097651377,
    4027552580, 2265490386, 503444072, 1762050814, 4150417245, 2154129355, 426522225, 1852507879,
    4275313526, 2312317920, 282753626, 1742555852, 4189708143, 2394877945, 397917763, 1622183637,
    3604390888, 2714866558, 953729732, 1340076626, 3518719985, 2797360999, 1068828381, 1219638859,
    3624741850, 2936675148, 906185462, 1090812512, 3747672003, 2825379669, 829329135, 1181335161,
    3412177804, 3160834842, 628085408, 1382605366, 3423369109, 3138078467, 570562233, 1426400815,
    3317316542, 2998733608, 733239954, 1555261956, 3268935591, 3050360625, 752459403, 1541320221,
    2607071920, 3965973030, 1969922972, 40735498, 2617837225, 3943577151, 1913087877, 83908371,
    2512341634, 3803740692, 2075208622, 213261112, 2463272603, 3855990285, 2094854071, 198958881,
    2262029012, 4057260610, 1759359992, 534414190, 2176718541, 4139329115, 1873836001, 414664567,
    2282248934, 4279200368, 1711684554, 285281116, 2405801727, 4167216745, 1634467795, 376229701,
    2685067896, 3608007406, 1308918612, 956543938, 2808555105, 3495958263, 1231636301, 1047427035,
    2932959818, 3654703836, 1088359270, 936918000, 2847714899, 3736837829, 1202900863, 817233897,
    3183342108, 3401237130, 1404277552, 615818150, 3134207493, 3453421203, 1423857449, 601450431,
    3009837614, 3294710456, 1567103746, 711928724, 3020668471, 3272380065, 1510334235, 755167117,
  }, {
    0, 421212481, 842424962, 724390851, 1684849924, 2105013317, 1448781702, 1329698503,
    3369699848, 3519200073, 4210026634, 3824474571, 2897563404, 3048111693, 2659397006, 2274893007,
    1254232657, 1406739216, 2029285587, 1643069842, 783210325, 934667796, 479770071, 92505238,
    2182846553, 2600511768, 2955803355, 2838940570, 3866582365, 4285295644, 3561045983, 3445231262,
    2508465314, 2359236067, 2813478432, 3198777185, 4058571174, 3908292839, 3286139684, 3670389349,
    1566420650, 1145479147, 1869335592, 1987116393, 959540142, 539646703, 185010476, 303839341,
    3745920755, 3327985586, 3983561841, 4100678960, 3140154359, 2721170102, 2300350837, 2416418868,
    396344571, 243568058, 631889529, 1018359608, 1945336319, 1793607870, 1103436669, 1490954812,
    4034481925, 3915546180, 3259968903, 3679722694, 2484439553, 2366552896, 2787371139, 3208174018,
    950060301, 565965900, 177645455, 328046286, 1556873225, 1171730760, 1861902987, 2011255754,
    3132841300, 2745199637, 2290958294, 2442530455, 3738671184, 3352078609, 3974232786, 4126854035,
    1919080284, 1803150877, 1079293406, 1498383519, 370020952, 253043481, 607678682, 1025720731,
    1711106983, 2095471334, 1472923941, 1322268772, 26324643, 411738082, 866634785, 717028704,
    2904875439, 3024081134, 2668790573, 2248782444, 3376948395, 3495106026, 4219356713, 3798300520,
    792689142, 908347575, 487136116, 68299317, 1263779058, 1380486579, 2036719216, 1618931505,
    3890672638, 4278043327, 3587215740, 3435896893, 2206873338, 2593195963, 2981909624, 2829542713,
    998479947, 580430090, 162921161, 279890824, 1609522511, 1190423566, 1842954189, 1958874764,
    4082766403, 3930137346, 3245109441, 3631694208, 2536953671, 2385372678, 2768287173, 3155920004,
    1900120602, 1750776667, 1131931800, 1517083097, 355290910, 204897887, 656092572, 1040194781,
    3113746450, 2692952403, 2343461520, 2461357009, 3723805974, 3304059991, 4022511508, 4141455061,
    2919742697, 3072101800, 2620513899, 2234183466, 3396041197, 3547351212, 4166851439, 3779471918,
    1725839073, 2143618976, 1424512099, 1307796770, 45282277, 464110244, 813994343, 698327078,
    3838160568, 4259225593, 3606301754, 3488152955, 2158586812, 2578602749, 2996767038, 2877569151,
    740041904, 889656817, 506086962, 120682355, 1215357364, 1366020341, 2051441462, 1667084919,
    3422213966, 3538019855, 4190942668, 3772220557, 2945847882, 3062702859, 2644537544, 2226864521,
    52649286, 439905287, 823476164, 672009861, 1733269570, 2119477507, 1434057408, 1281543041,
    2167981343, 2552493150, 3004082077, 2853541596, 3847487515, 4233048410, 3613549209, 3464057816,
    1239502615, 1358593622, 2077699477, 1657543892, 764250643, 882293586, 532408465, 111204816,
    1585378284, 1197851309, 1816695150, 1968414767, 974272232, 587794345, 136598634, 289367339,
    2527558116, 2411481253, 2760973158, 3179948583, 4073438432, 3956313505, 3237863010, 3655790371,
    347922877, 229101820, 646611775, 1066513022, 1892689081, 1774917112, 1122387515, 1543337850,
    3697634229, 3313392372, 3998419255, 4148705398, 3087642289, 2702352368, 2319436851, 2468674930,
  }, {
    0, 29518391, 59036782, 38190681, 118073564, 114017003, 76381362, 89069189,
    236147128, 265370511, 228034006, 206958561, 152762724, 148411219, 178138378, 190596925,
    472294256, 501532999, 530741022, 509615401, 456068012, 451764635, 413917122, 426358261,
    305525448, 334993663, 296822438, 275991697, 356276756, 352202787, 381193850, 393929805,
    944588512, 965684439, 1003065998, 973863097, 1061482044, 1049003019, 1019230802, 1023561829,
    912136024, 933002607, 903529270, 874031361, 827834244, 815125939, 852716522, 856752605,
    611050896, 631869351, 669987326, 640506825, 593644876, 580921211, 551983394, 556069653,
    712553512, 733666847, 704405574, 675154545, 762387700, 749958851, 787859610, 792175277,
    1889177024, 1901651959, 1931368878, 1927033753, 2006131996, 1985040171, 1947726194, 1976933189,
    2122964088, 2135668303, 2098006038, 2093965857, 2038461604, 2017599123, 2047123658, 2076625661,
    1824272048, 1836991623, 1866005214, 1861914857, 1807058540, 1786244187, 1748062722, 1777547317,
    1655668488, 1668093247, 1630251878, 1625932113, 1705433044, 1684323811, 1713505210, 1742760333,
    1222101792, 1226154263, 1263738702, 1251046777, 1339974652, 1310460363, 1281013650, 1301863845,
    1187289752, 1191637167, 1161842422, 1149379777, 1103966788, 1074747507, 1112139306, 1133218845,
    1425107024, 1429406311, 1467333694, 1454888457, 1408811148, 1379576507, 1350309090, 1371438805,
    1524775400, 1528845279, 1499917702, 1487177649, 1575719220, 1546255107, 1584350554, 1605185389,
    3778354048, 3774312887, 3803303918, 3816007129, 3862737756, 3892238699, 3854067506, 3833203973,
    4012263992, 4007927823, 3970080342, 3982554209, 3895452388, 3924658387, 3953866378, 3932773565,
    4245928176, 4241609415, 4271336606, 4283762345, 4196012076, 4225268251, 4187931714, 4166823541,
    4076923208, 4072833919, 4035198246, 4047918865, 4094247316, 4123732899, 4153251322, 4132437965,
    3648544096, 3636082519, 3673983246, 3678331705, 3732010428, 3753090955, 3723829714, 3694611429,
    3614117080, 3601426159, 3572488374, 3576541825, 3496125444, 3516976691, 3555094634, 3525581405,
    3311336976, 3298595879, 3336186494, 3340255305, 3260503756, 3281337595, 3251864226, 3222399125,
    3410866088, 3398419871, 3368647622, 3372945905, 3427010420, 3448139075, 3485520666, 3456284973,
    2444203584, 2423127159, 2452308526, 2481530905, 2527477404, 2539934891, 2502093554, 2497740997,
    2679949304, 2659102159, 2620920726, 2650438049, 2562027300, 2574714131, 2603727690, 2599670141,
    2374579504, 2353749767, 2383274334, 2412743529, 2323684844, 2336421851, 2298759554, 2294686645,
    2207933576, 2186809023, 2149495014, 2178734801, 2224278612, 2236720739, 2266437690, 2262135309,
    2850214048, 2820717207, 2858812622, 2879680249, 2934667388, 2938704459, 2909776914, 2897069605,
    2817622296, 2788420399, 2759153014, 2780249921, 2700618180, 2704950259, 2742877610, 2730399645,
    3049550800, 3020298727, 3057690558, 3078802825, 2999835404, 3004150075, 2974355298, 2961925461,
    3151438440, 3121956959, 3092510214, 3113327665, 3168701108, 3172786307, 3210370778, 3197646061,
  }, {
    0, 3099354981, 2852767883, 313896942, 2405603159, 937357362, 627793884, 2648127673,
    3316918511, 2097696650, 1874714724, 3607201537, 1255587768, 4067088605, 3772741427, 1482887254,
    1343838111, 3903140090, 4195393300, 1118632049, 3749429448, 1741137837, 1970407491, 3452858150,
    2511175536, 756094997, 1067759611, 2266550430, 449832999, 2725482306, 2965774508, 142231497,
    2687676222, 412010587, 171665333, 2995192016, 793786473, 2548850444, 2237264098, 1038456711,
    1703315409, 3711623348, 3482275674, 1999841343, 3940814982, 1381529571, 1089329165, 4166106984,
    4029413537, 1217896388, 1512189994, 3802027855, 2135519222, 3354724499, 3577784189, 1845280792,
    899665998, 2367928107, 2677414085, 657096608, 3137160985, 37822588, 284462994, 2823350519,
    2601801789, 598228824, 824021174, 2309093331, 343330666, 2898962447, 3195996129, 113467524,
    1587572946, 3860600759, 4104763481, 1276501820, 3519211397, 1769898208, 2076913422, 3279374443,
    3406630818, 1941006535, 1627703081, 3652755532, 1148164341, 4241751952, 3999682686, 1457141531,
    247015245, 3053797416, 2763059142, 470583459, 2178658330, 963106687, 735213713, 2473467892,
    992409347, 2207944806, 2435792776, 697522413, 3024379988, 217581361, 508405983, 2800865210,
    4271038444, 1177467017, 1419450215, 3962007554, 1911572667, 3377213406, 3690561584, 1665525589,
    1799331996, 3548628985, 3241568279, 2039091058, 3831314379, 1558270126, 1314193216, 4142438437,
    2928380019, 372764438, 75645176, 3158189981, 568925988, 2572515393, 2346768303, 861712586,
    3982079547, 1441124702, 1196457648, 4293663189, 1648042348, 3666298377, 3358779879, 1888390786,
    686661332, 2421291441, 2196002399, 978858298, 2811169155, 523464422, 226935048, 3040519789,
    3175145892, 100435649, 390670639, 2952089162, 841119475, 2325614998, 2553003640, 546822429,
    2029308235, 3225988654, 3539796416, 1782671013, 4153826844, 1328167289, 1570739863, 3844338162,
    1298864389, 4124540512, 3882013070, 1608431339, 3255406162, 2058742071, 1744848601, 3501990332,
    2296328682, 811816591, 584513889, 2590678532, 129869501, 3204563416, 2914283062, 352848211,
    494030490, 2781751807, 3078325777, 264757620, 2450577869, 715964072, 941166918, 2158327331,
    3636881013, 1618608400, 1926213374, 3396585883, 1470427426, 4011365959, 4255988137, 1158766284,
    1984818694, 3471935843, 3695453837, 1693991400, 4180638033, 1100160564, 1395044826, 3952793279,
    3019491049, 189112716, 435162722, 2706139399, 1016811966, 2217162459, 2526189877, 774831696,
    643086745, 2666061564, 2354934034, 887166583, 2838900430, 294275499, 54519365, 3145957664,
    3823145334, 1532818963, 1240029693, 4048895640, 1820460577, 3560857924, 3331051178, 2117577167,
    3598663992, 1858283101, 2088143283, 3301633750, 1495127663, 3785470218, 4078182116, 1269332353,
    332098007, 2876706482, 3116540252, 25085497, 2628386432, 605395429, 916469259, 2384220526,
    2254837415, 1054503362, 745528876, 2496903497, 151290352, 2981684885, 2735556987, 464596510,
    1137851976, 4218313005, 3923506883, 1365741990, 3434129695, 1946996346, 1723425172, 3724871409,
  }, {
    0, 1029712304, 2059424608, 1201699536, 4118849216, 3370159984, 2403399072, 2988497936,
    812665793, 219177585, 1253054625, 2010132753, 3320900865, 4170237105, 3207642721, 2186319825,
    1625331586, 1568718386, 438355170, 658566482, 2506109250, 2818578674, 4020265506, 3535817618,
    1351670851, 1844508147, 709922595, 389064339, 2769320579, 2557498163, 3754961379, 3803185235,
    3250663172, 4238411444, 3137436772, 2254525908, 876710340, 153198708, 1317132964, 1944187668,
    4054934725, 3436268917, 2339452837, 3054575125, 70369797, 961670069, 2129760613, 1133623509,
    2703341702, 2621542710, 3689016294, 3867263574, 1419845190, 1774270454, 778128678, 318858390,
    2438067015, 2888948471, 3952189479, 3606153623, 1691440519, 1504803895, 504432359, 594620247,
    1492342857, 1704161785, 573770537, 525542041, 2910060169, 2417219385, 3618876905, 3939730521,
    1753420680, 1440954936, 306397416, 790849880, 2634265928, 2690882808, 3888375336, 3668168600,
    940822475, 91481723, 1121164459, 2142483739, 3448989963, 4042473659, 3075684971, 2318603227,
    140739594, 889433530, 1923340138, 1338244826, 4259521226, 3229813626, 2267247018, 3124975642,
    2570221389, 2756861693, 3824297005, 3734113693, 1823658381, 1372780605, 376603373, 722643805,
    2839690380, 2485261628, 3548540908, 4007806556, 1556257356, 1638052860, 637716780, 459464860,
    4191346895, 3300051327, 2199040943, 3195181599, 206718479, 825388991, 1989285231, 1274166495,
    3382881038, 4106388158, 3009607790, 2382549470, 1008864718, 21111934, 1189240494, 2072147742,
    2984685714, 2357631266, 3408323570, 4131834434, 1147541074, 2030452706, 1051084082, 63335554,
    2174155603, 3170292451, 4216760371, 3325460867, 1947622803, 1232499747, 248909555, 867575619,
    3506841360, 3966111392, 2881909872, 2527485376, 612794832, 434546784, 1581699760, 1663499008,
    3782634705, 3692447073, 2612412337, 2799048193, 351717905, 697754529, 1849071985, 1398190273,
    1881644950, 1296545318, 182963446, 931652934, 2242328918, 3100053734, 4284967478, 3255255942,
    1079497815, 2100821479, 983009079, 133672583, 3050795671, 2293717799, 3474399735, 4067887175,
    281479188, 765927844, 1778867060, 1466397380, 3846680276, 3626469220, 2676489652, 2733102084,
    548881365, 500656741, 1517752501, 1729575173, 3577210133, 3898068133, 2952246901, 2459410373,
    3910527195, 3564487019, 2480257979, 2931134987, 479546907, 569730987, 1716854139, 1530213579,
    3647316762, 3825568426, 2745561210, 2663766474, 753206746, 293940330, 1445287610, 1799716618,
    2314567513, 3029685993, 4080348217, 3461678473, 2088098201, 1091956777, 112560889, 1003856713,
    3112514712, 2229607720, 3276105720, 4263857736, 1275433560, 1902492648, 918929720, 195422344,
    685033439, 364179055, 1377080511, 1869921551, 3713294623, 3761522863, 2811507327, 2599689167,
    413436958, 633644462, 1650777982, 1594160846, 3978570462, 3494118254, 2548332990, 2860797966,
    1211387997, 1968470509, 854852413, 261368461, 3182753437, 2161434413, 3346310653, 4195650637,
    2017729436, 1160000044, 42223868, 1071931724, 2378480988, 2963576044, 4144295484, 3395602316,
  }, {
    0, 3411858341, 1304994059, 2257875630, 2609988118, 1355649459, 3596215069, 486879416,
    3964895853, 655315400, 2711298918, 1791488195, 2009251963, 3164476382, 973758832, 4048990933,
    64357019, 3364540734, 1310630800, 2235723829, 2554806413, 1394316072, 3582976390, 517157411,
    4018503926, 618222419, 2722963965, 1762783832, 1947517664, 3209171269, 970744811, 4068520014,
    128714038, 3438335635, 1248109629, 2167961496, 2621261600, 1466012805, 3522553387, 447296910,
    3959392091, 547575038, 2788632144, 1835791861, 1886307661, 3140622056, 1034314822, 4143626211,
    75106221, 3475428360, 1236444838, 2196665603, 2682996155, 1421317662, 3525567664, 427767573,
    3895035328, 594892389, 2782995659, 1857943406, 1941489622, 3101955187, 1047553757, 4113347960,
    257428076, 3288652233, 1116777319, 2311878850, 2496219258, 1603640287, 3640781169, 308099796,
    3809183745, 676813732, 2932025610, 1704983215, 2023410199, 3016104370, 894593820, 4262377657,
    210634999, 3352484690, 1095150076, 2316991065, 2535410401, 1547934020, 3671583722, 294336591,
    3772615322, 729897279, 2903845777, 1716123700, 2068629644, 2953845545, 914647431, 4258839074,
    150212442, 3282623743, 1161604689, 2388688372, 2472889676, 1480171241, 3735940167, 368132066,
    3836185911, 805002898, 2842635324, 1647574937, 2134298401, 3026852996, 855535146, 4188192143,
    186781121, 3229539940, 1189784778, 2377547631, 2427670487, 1542429810, 3715886812, 371670393,
    3882979244, 741170185, 2864262823, 1642462466, 2095107514, 3082559007, 824732849, 4201955092,
    514856152, 3589064573, 1400419795, 2552522358, 2233554638, 1316849003, 3370776517, 62202976,
    4075001525, 968836368, 3207280574, 1954014235, 1769133219, 2720925446, 616199592, 4024870413,
    493229635, 3594175974, 1353627464, 2616354029, 2264355925, 1303087088, 3409966430, 6498043,
    4046820398, 979978123, 3170710821, 2007099008, 1789187640, 2717386141, 661419827, 3962610838,
    421269998, 3527459403, 1423225061, 2676515648, 2190300152, 1238466653, 3477467891, 68755798,
    4115633027, 1041448998, 3095868040, 1943789869, 1860096405, 2776760880, 588673182, 3897205563,
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    1724586270, 4251866481, 2331019137, 290835438, 1707942497, 4268256782, 2314648830, 307490961,
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    1115789546, 3643069573, 2931426933, 891243034, 1099408277, 3659722746, 2914794762, 907637093,
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    1510200173, 2274691816, 979330598, 3888758691, 2595928571, 1194090622, 4209380528, 661706037,
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    1084066558, 2634765179, 549535669, 4250396208, 2149900392, 1571961325, 3765982499, 1039043750,
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    0, 2635063670, 3782132909, 2086741467, 430739227, 2225303149, 4173482934, 1707977408,
    861478454, 2924937024, 3526875803, 1329085421, 720736557, 3086643291, 3415954816, 1452586230,
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    3445913816, 1349228974, 738901109, 2969918723, 3569940419, 1237784245, 900084590, 2829701656,
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    1102706673, 3702920839, 2698457948, 1037619754, 1477802218, 3306854812, 3111894087, 611605809,
    1927342535, 4025419953, 2475568490, 243387420, 1800169180, 4131620778, 2317525617, 388842247,
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    3933188933, 2002801203, 184645608, 2517538462, 4089658462, 1858919720, 313391347, 2409765253,
    3644239219, 1144605701, 945318366, 2773977256, 3231326824, 1570095902, 569697989, 3170568115,
    2205413346, 511446676, 1646078799, 4279421497, 2598330617, 131105167, 2075239508, 3871229218,
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    3600338360, 1268198606, 938871061, 2868504675, 3476308643, 1379640277, 777684494, 3008718712,
    1310168890, 3541595724, 2943964055, 846639841, 1471879201, 3400857943, 3067468940, 735723002,
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    681945942, 3047836192, 3385552891, 1422167693, 822682701, 2886124859, 3496468704, 1298661782,
    469546336, 2264093718, 4203901389, 1738379451, 38812283, 2673859341, 3812556502, 2117148576,
    3268024339, 1606809957, 598006974, 3198893512, 3680933640, 1181316734, 973624229, 2802299603,
    4052944421, 1822222163, 285065864, 2381456382, 3896478014, 1966106696, 156323219, 2489232613,
    2759337087, 964150537, 1159127250, 3625517476, 3184831332, 551242258, 1555722185, 3249901247,
    2535537225, 170842943, 1984954084, 3946848146, 2391651666, 327308324, 1877176831, 4075589769,
    263086283, 2460058045, 4005602406, 1942963472, 369291216, 2332888742, 4151061373, 1784924683,
    1022852861, 2717425547, 3717839440, 1083595558, 626782694, 3092517008, 3291821387, 1497027645,
    1763466407, 4094934481, 2289211402, 360544636, 1890636732, 3988730570, 2447251217, 215086695,
    1514488465, 3343557607, 3140191804, 639919946, 1139395978, 3739626748, 2726758695, 1065936977,
  }, {
    0, 3120290792, 2827399569, 293431929, 2323408227, 864534155, 586863858, 2600537882,
    3481914503, 1987188591, 1729068310, 3740575486, 1173727716, 4228805132, 3983743093, 1418249117,
    1147313999, 4254680231, 3974377182, 1428157750, 3458136620, 2011505092, 1721256893, 3747844181,
    2347455432, 839944224, 594403929, 2593536433, 26687147, 3094146371, 2836498234, 283794642,
    2294627998, 826205558, 541298447, 2578994407, 45702141, 3141697557, 2856315500, 331624836,
    1196225049, 4273416689, 4023010184, 1446090848, 3442513786, 1959480466, 1706436331, 3696098563,
    3433538001, 1968994873, 1679888448, 3722103720, 1188807858, 4280295258, 3999102243, 1470541515,
    53374294, 3134568126, 2879970503, 307431215, 2303854645, 816436189, 567589284, 2553242188,
    3405478781, 1929420949, 1652411116, 3682996484, 1082596894, 4185703926, 3892424591, 1375368295,
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    3312231283, 2090301595, 1844056802, 3557935370, 1326499344, 4142603768, 3885397889, 1584245865,
    3326266917, 2142836173, 1858371508, 3611272284, 1279175494, 4123357358, 3837270743, 1564721471,
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    1222322711, 4045468159, 3764231046, 1504067694, 3265744756, 2069664924, 1780612837, 3554288909,
    2270357136, 1051278712, 802445057, 2519698665, 221152243, 3033880603, 2779263586, 475261322,
  }, {
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    1930665807, 3715829470, 4105419308, 1524313021, 2804077512, 155861593, 545453739, 2397726522,
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  },
};

static const uint8_t
WUFFS_CRC32__IEEE_X86_SSE42_K1K2[16] WUFFS_BASE__POTENTIALLY_UNUSED = {
  212, 43, 68, 84, 1, 0, 0, 0,
  150, 21, 228, 198, 1, 0, 0, 0,
};

static const uint8_t
WUFFS_CRC32__IEEE_X86_SSE42_K3K4[16] WUFFS_BASE__POTENTIALLY_UNUSED = {
  208, 151, 25, 117, 1, 0, 0, 0,
  158, 0, 170, 204, 0, 0, 0, 0,
};

static const uint8_t
WUFFS_CRC32__IEEE_X86_SSE42_K5ZZ[16] WUFFS_BASE__POTENTIALLY_UNUSED = {
  36, 97, 205, 99, 1, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
};

static const uint8_t
WUFFS_CRC32__IEEE_X86_SSE42_K6MU[16] WUFFS_BASE__POTENTIALLY_UNUSED = {
  65, 6, 113, 219, 1, 0, 0, 0,
  65, 22, 1, 247, 1, 0, 0, 0,
};

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

static wuffs_base__empty_struct
wuffs_crc32__ieee_hasher__up(
    wuffs_crc32__ieee_hasher* self,
    wuffs_base__slice_u8 a_x);

static wuffs_base__empty_struct
wuffs_crc32__ieee_hasher__up__choosy_default(
    wuffs_crc32__ieee_hasher* self,
    wuffs_base__slice_u8 a_x);

#if defined(WUFFS_BASE__CPU_ARCH__ARM_CRC32)
static wuffs_base__empty_struct
wuffs_crc32__ieee_hasher__up_arm_crc32(
    wuffs_crc32__ieee_hasher* self,
    wuffs_base__slice_u8 a_x);
#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_CRC32)

#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
static wuffs_base__empty_struct
wuffs_crc32__ieee_hasher__up_x86_sse42(
    wuffs_crc32__ieee_hasher* self,
    wuffs_base__slice_u8 a_x);
#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_64)

// ---------------- VTables

const wuffs_base__hasher_u32__func_ptrs
wuffs_crc32__ieee_hasher__func_ptrs_for__wuffs_base__hasher_u32 = {
  (wuffs_base__empty_struct(*)(void*,
      uint32_t,
      bool))(&wuffs_crc32__ieee_hasher__set_quirk_enabled),
  (uint32_t(*)(void*,
      wuffs_base__slice_u8))(&wuffs_crc32__ieee_hasher__update_u32),
};

// ---------------- Initializer Implementations

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_crc32__ieee_hasher__initialize(
    wuffs_crc32__ieee_hasher* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options){
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (sizeof(*self) != sizeof_star_self) {
    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
  }
  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
  }

  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
    // The whole point of this if-check is to detect an uninitialized *self.
    // We disable the warning on GCC. Clang-5.0 does not have this warning.
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
    if (self->private_impl.magic != 0) {
      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
    }
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
  } else {
    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    } else {
      memset(&(self->private_impl), 0, sizeof(self->private_impl));
    }
  }

  self->private_impl.choosy_up = &wuffs_crc32__ieee_hasher__up__choosy_default;

  self->private_impl.magic = WUFFS_BASE__MAGIC;
  self->private_impl.vtable_for__wuffs_base__hasher_u32.vtable_name =
      wuffs_base__hasher_u32__vtable_name;
  self->private_impl.vtable_for__wuffs_base__hasher_u32.function_pointers =
      (const void*)(&wuffs_crc32__ieee_hasher__func_ptrs_for__wuffs_base__hasher_u32);
  return wuffs_base__make_status(NULL);
}

wuffs_crc32__ieee_hasher*
wuffs_crc32__ieee_hasher__alloc() {
  wuffs_crc32__ieee_hasher* x =
      (wuffs_crc32__ieee_hasher*)(calloc(sizeof(wuffs_crc32__ieee_hasher), 1));
  if (!x) {
    return NULL;
  }
  if (wuffs_crc32__ieee_hasher__initialize(
      x, sizeof(wuffs_crc32__ieee_hasher), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
    free(x);
    return NULL;
  }
  return x;
}

size_t
sizeof__wuffs_crc32__ieee_hasher() {
  return sizeof(wuffs_crc32__ieee_hasher);
}

// ---------------- Function Implementations

// -------- func crc32.ieee_hasher.set_quirk_enabled

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_crc32__ieee_hasher__set_quirk_enabled(
    wuffs_crc32__ieee_hasher* self,
    uint32_t a_quirk,
    bool a_enabled) {
  return wuffs_base__make_empty_struct();
}

// -------- func crc32.ieee_hasher.update_u32

WUFFS_BASE__MAYBE_STATIC uint32_t
wuffs_crc32__ieee_hasher__update_u32(
    wuffs_crc32__ieee_hasher* self,
    wuffs_base__slice_u8 a_x) {
  if (!self) {
    return 0;
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return 0;
  }

  if (self->private_impl.f_state == 0) {
    self->private_impl.choosy_up = (
#if defined(WUFFS_BASE__CPU_ARCH__ARM_CRC32)
        wuffs_base__cpu_arch__have_arm_crc32() ? &wuffs_crc32__ieee_hasher__up_arm_crc32 :
#endif
#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
        wuffs_base__cpu_arch__have_x86_sse42() ? &wuffs_crc32__ieee_hasher__up_x86_sse42 :
#endif
        self->private_impl.choosy_up);
  }
  wuffs_crc32__ieee_hasher__up(self, a_x);
  return self->private_impl.f_state;
}

// -------- func crc32.ieee_hasher.up

static wuffs_base__empty_struct
wuffs_crc32__ieee_hasher__up(
    wuffs_crc32__ieee_hasher* self,
    wuffs_base__slice_u8 a_x) {
  return (*self->private_impl.choosy_up)(self, a_x);
}

static wuffs_base__empty_struct
wuffs_crc32__ieee_hasher__up__choosy_default(
    wuffs_crc32__ieee_hasher* self,
    wuffs_base__slice_u8 a_x) {
  uint32_t v_s = 0;
  wuffs_base__slice_u8 v_p = {0};

  v_s = (4294967295 ^ self->private_impl.f_state);
  {
    wuffs_base__slice_u8 i_slice_p = a_x;
    v_p.ptr = i_slice_p.ptr;
    v_p.len = 16;
    uint8_t* i_end0_p = v_p.ptr + (((i_slice_p.len - (size_t)(v_p.ptr - i_slice_p.ptr)) / 32) * 32);
    while (v_p.ptr < i_end0_p) {
      v_s ^= ((((uint32_t)(v_p.ptr[0])) << 0) |
          (((uint32_t)(v_p.ptr[1])) << 8) |
          (((uint32_t)(v_p.ptr[2])) << 16) |
          (((uint32_t)(v_p.ptr[3])) << 24));
      v_s = (WUFFS_CRC32__IEEE_TABLE[0][v_p.ptr[15]] ^
          WUFFS_CRC32__IEEE_TABLE[1][v_p.ptr[14]] ^
          WUFFS_CRC32__IEEE_TABLE[2][v_p.ptr[13]] ^
          WUFFS_CRC32__IEEE_TABLE[3][v_p.ptr[12]] ^
          WUFFS_CRC32__IEEE_TABLE[4][v_p.ptr[11]] ^
          WUFFS_CRC32__IEEE_TABLE[5][v_p.ptr[10]] ^
          WUFFS_CRC32__IEEE_TABLE[6][v_p.ptr[9]] ^
          WUFFS_CRC32__IEEE_TABLE[7][v_p.ptr[8]] ^
          WUFFS_CRC32__IEEE_TABLE[8][v_p.ptr[7]] ^
          WUFFS_CRC32__IEEE_TABLE[9][v_p.ptr[6]] ^
          WUFFS_CRC32__IEEE_TABLE[10][v_p.ptr[5]] ^
          WUFFS_CRC32__IEEE_TABLE[11][v_p.ptr[4]] ^
          WUFFS_CRC32__IEEE_TABLE[12][(255 & (v_s >> 24))] ^
          WUFFS_CRC32__IEEE_TABLE[13][(255 & (v_s >> 16))] ^
          WUFFS_CRC32__IEEE_TABLE[14][(255 & (v_s >> 8))] ^
          WUFFS_CRC32__IEEE_TABLE[15][(255 & (v_s >> 0))]);
      v_p.ptr += 16;
      v_s ^= ((((uint32_t)(v_p.ptr[0])) << 0) |
          (((uint32_t)(v_p.ptr[1])) << 8) |
          (((uint32_t)(v_p.ptr[2])) << 16) |
          (((uint32_t)(v_p.ptr[3])) << 24));
      v_s = (WUFFS_CRC32__IEEE_TABLE[0][v_p.ptr[15]] ^
          WUFFS_CRC32__IEEE_TABLE[1][v_p.ptr[14]] ^
          WUFFS_CRC32__IEEE_TABLE[2][v_p.ptr[13]] ^
          WUFFS_CRC32__IEEE_TABLE[3][v_p.ptr[12]] ^
          WUFFS_CRC32__IEEE_TABLE[4][v_p.ptr[11]] ^
          WUFFS_CRC32__IEEE_TABLE[5][v_p.ptr[10]] ^
          WUFFS_CRC32__IEEE_TABLE[6][v_p.ptr[9]] ^
          WUFFS_CRC32__IEEE_TABLE[7][v_p.ptr[8]] ^
          WUFFS_CRC32__IEEE_TABLE[8][v_p.ptr[7]] ^
          WUFFS_CRC32__IEEE_TABLE[9][v_p.ptr[6]] ^
          WUFFS_CRC32__IEEE_TABLE[10][v_p.ptr[5]] ^
          WUFFS_CRC32__IEEE_TABLE[11][v_p.ptr[4]] ^
          WUFFS_CRC32__IEEE_TABLE[12][(255 & (v_s >> 24))] ^
          WUFFS_CRC32__IEEE_TABLE[13][(255 & (v_s >> 16))] ^
          WUFFS_CRC32__IEEE_TABLE[14][(255 & (v_s >> 8))] ^
          WUFFS_CRC32__IEEE_TABLE[15][(255 & (v_s >> 0))]);
      v_p.ptr += 16;
    }
    v_p.len = 16;
    uint8_t* i_end1_p = v_p.ptr + (((i_slice_p.len - (size_t)(v_p.ptr - i_slice_p.ptr)) / 16) * 16);
    while (v_p.ptr < i_end1_p) {
      v_s ^= ((((uint32_t)(v_p.ptr[0])) << 0) |
          (((uint32_t)(v_p.ptr[1])) << 8) |
          (((uint32_t)(v_p.ptr[2])) << 16) |
          (((uint32_t)(v_p.ptr[3])) << 24));
      v_s = (WUFFS_CRC32__IEEE_TABLE[0][v_p.ptr[15]] ^
          WUFFS_CRC32__IEEE_TABLE[1][v_p.ptr[14]] ^
          WUFFS_CRC32__IEEE_TABLE[2][v_p.ptr[13]] ^
          WUFFS_CRC32__IEEE_TABLE[3][v_p.ptr[12]] ^
          WUFFS_CRC32__IEEE_TABLE[4][v_p.ptr[11]] ^
          WUFFS_CRC32__IEEE_TABLE[5][v_p.ptr[10]] ^
          WUFFS_CRC32__IEEE_TABLE[6][v_p.ptr[9]] ^
          WUFFS_CRC32__IEEE_TABLE[7][v_p.ptr[8]] ^
          WUFFS_CRC32__IEEE_TABLE[8][v_p.ptr[7]] ^
          WUFFS_CRC32__IEEE_TABLE[9][v_p.ptr[6]] ^
          WUFFS_CRC32__IEEE_TABLE[10][v_p.ptr[5]] ^
          WUFFS_CRC32__IEEE_TABLE[11][v_p.ptr[4]] ^
          WUFFS_CRC32__IEEE_TABLE[12][(255 & (v_s >> 24))] ^
          WUFFS_CRC32__IEEE_TABLE[13][(255 & (v_s >> 16))] ^
          WUFFS_CRC32__IEEE_TABLE[14][(255 & (v_s >> 8))] ^
          WUFFS_CRC32__IEEE_TABLE[15][(255 & (v_s >> 0))]);
      v_p.ptr += 16;
    }
    v_p.len = 1;
    uint8_t* i_end2_p = i_slice_p.ptr + i_slice_p.len;
    while (v_p.ptr < i_end2_p) {
      v_s = (WUFFS_CRC32__IEEE_TABLE[0][(((uint8_t)((v_s & 255))) ^ v_p.ptr[0])] ^ (v_s >> 8));
      v_p.ptr += 1;
    }
    v_p.len = 0;
  }
  self->private_impl.f_state = (4294967295 ^ v_s);
  return wuffs_base__make_empty_struct();
}

// -------- func crc32.ieee_hasher.up_arm_crc32

#if defined(WUFFS_BASE__CPU_ARCH__ARM_CRC32)
static wuffs_base__empty_struct
wuffs_crc32__ieee_hasher__up_arm_crc32(
    wuffs_crc32__ieee_hasher* self,
    wuffs_base__slice_u8 a_x) {
  wuffs_base__slice_u8 v_p = {0};
  uint32_t v_s = 0;

  v_s = (4294967295 ^ self->private_impl.f_state);
  while ((((uint64_t)(a_x.len)) > 0) && ((15 & ((uint32_t)(0xFFF & (uintptr_t)(a_x.ptr)))) != 0)) {
    v_s = __crc32b(v_s, a_x.ptr[0]);
    a_x = wuffs_base__slice_u8__subslice_i(a_x, 1);
  }
  {
    wuffs_base__slice_u8 i_slice_p = a_x;
    v_p.ptr = i_slice_p.ptr;
    v_p.len = 8;
    uint8_t* i_end0_p = v_p.ptr + (((i_slice_p.len - (size_t)(v_p.ptr - i_slice_p.ptr)) / 128) * 128);
    while (v_p.ptr < i_end0_p) {
      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
      v_p.ptr += 8;
      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
      v_p.ptr += 8;
      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
      v_p.ptr += 8;
      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
      v_p.ptr += 8;
      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
      v_p.ptr += 8;
      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
      v_p.ptr += 8;
      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
      v_p.ptr += 8;
      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
      v_p.ptr += 8;
      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
      v_p.ptr += 8;
      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
      v_p.ptr += 8;
      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
      v_p.ptr += 8;
      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
      v_p.ptr += 8;
      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
      v_p.ptr += 8;
      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
      v_p.ptr += 8;
      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
      v_p.ptr += 8;
      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
      v_p.ptr += 8;
    }
    v_p.len = 8;
    uint8_t* i_end1_p = v_p.ptr + (((i_slice_p.len - (size_t)(v_p.ptr - i_slice_p.ptr)) / 8) * 8);
    while (v_p.ptr < i_end1_p) {
      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
      v_p.ptr += 8;
    }
    v_p.len = 1;
    uint8_t* i_end2_p = i_slice_p.ptr + i_slice_p.len;
    while (v_p.ptr < i_end2_p) {
      v_s = __crc32b(v_s, v_p.ptr[0]);
      v_p.ptr += 1;
    }
    v_p.len = 0;
  }
  self->private_impl.f_state = (4294967295 ^ v_s);
  return wuffs_base__make_empty_struct();
}
#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_CRC32)

// -------- func crc32.ieee_hasher.up_x86_sse42

#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
#if defined(__GNUC__)
__attribute__((target("pclmul,popcnt,sse4.2")))
#endif
static wuffs_base__empty_struct
wuffs_crc32__ieee_hasher__up_x86_sse42(
    wuffs_crc32__ieee_hasher* self,
    wuffs_base__slice_u8 a_x) {
  uint32_t v_s = 0;
  wuffs_base__slice_u8 v_p = {0};
  __m128i v_k = {0};
  __m128i v_x0 = {0};
  __m128i v_x1 = {0};
  __m128i v_x2 = {0};
  __m128i v_x3 = {0};
  __m128i v_y0 = {0};
  __m128i v_y1 = {0};
  __m128i v_y2 = {0};
  __m128i v_y3 = {0};
  uint64_t v_tail_index = 0;

  v_s = (4294967295 ^ self->private_impl.f_state);
  while ((((uint64_t)(a_x.len)) > 0) && ((15 & ((uint32_t)(0xFFF & (uintptr_t)(a_x.ptr)))) != 0)) {
    v_s = (WUFFS_CRC32__IEEE_TABLE[0][(((uint8_t)((v_s & 255))) ^ a_x.ptr[0])] ^ (v_s >> 8));
    a_x = wuffs_base__slice_u8__subslice_i(a_x, 1);
  }
  if (((uint64_t)(a_x.len)) < 64) {
    {
      wuffs_base__slice_u8 i_slice_p = a_x;
      v_p.ptr = i_slice_p.ptr;
      v_p.len = 1;
      uint8_t* i_end0_p = i_slice_p.ptr + i_slice_p.len;
      while (v_p.ptr < i_end0_p) {
        v_s = (WUFFS_CRC32__IEEE_TABLE[0][(((uint8_t)((v_s & 255))) ^ v_p.ptr[0])] ^ (v_s >> 8));
        v_p.ptr += 1;
      }
      v_p.len = 0;
    }
    self->private_impl.f_state = (4294967295 ^ v_s);
    return wuffs_base__make_empty_struct();
  }
  v_x0 = _mm_lddqu_si128((const __m128i*)(const void*)(a_x.ptr + 0));
  v_x1 = _mm_lddqu_si128((const __m128i*)(const void*)(a_x.ptr + 16));
  v_x2 = _mm_lddqu_si128((const __m128i*)(const void*)(a_x.ptr + 32));
  v_x3 = _mm_lddqu_si128((const __m128i*)(const void*)(a_x.ptr + 48));
  v_x0 = _mm_xor_si128(v_x0, _mm_cvtsi32_si128((int32_t)(v_s)));
  v_k = _mm_lddqu_si128((const __m128i*)(const void*)(WUFFS_CRC32__IEEE_X86_SSE42_K1K2));
  {
    wuffs_base__slice_u8 i_slice_p = wuffs_base__slice_u8__subslice_i(a_x, 64);
    v_p.ptr = i_slice_p.ptr;
    v_p.len = 64;
    uint8_t* i_end0_p = v_p.ptr + (((i_slice_p.len - (size_t)(v_p.ptr - i_slice_p.ptr)) / 64) * 64);
    while (v_p.ptr < i_end0_p) {
      v_y0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(0));
      v_y1 = _mm_clmulepi64_si128(v_x1, v_k, (int32_t)(0));
      v_y2 = _mm_clmulepi64_si128(v_x2, v_k, (int32_t)(0));
      v_y3 = _mm_clmulepi64_si128(v_x3, v_k, (int32_t)(0));
      v_x0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(17));
      v_x1 = _mm_clmulepi64_si128(v_x1, v_k, (int32_t)(17));
      v_x2 = _mm_clmulepi64_si128(v_x2, v_k, (int32_t)(17));
      v_x3 = _mm_clmulepi64_si128(v_x3, v_k, (int32_t)(17));
      v_x0 = _mm_xor_si128(_mm_xor_si128(v_x0, v_y0), _mm_lddqu_si128((const __m128i*)(const void*)(v_p.ptr + 0)));
      v_x1 = _mm_xor_si128(_mm_xor_si128(v_x1, v_y1), _mm_lddqu_si128((const __m128i*)(const void*)(v_p.ptr + 16)));
      v_x2 = _mm_xor_si128(_mm_xor_si128(v_x2, v_y2), _mm_lddqu_si128((const __m128i*)(const void*)(v_p.ptr + 32)));
      v_x3 = _mm_xor_si128(_mm_xor_si128(v_x3, v_y3), _mm_lddqu_si128((const __m128i*)(const void*)(v_p.ptr + 48)));
      v_p.ptr += 64;
    }
    v_p.len = 0;
  }
  v_k = _mm_lddqu_si128((const __m128i*)(const void*)(WUFFS_CRC32__IEEE_X86_SSE42_K3K4));
  v_y0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(0));
  v_x0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(17));
  v_x0 = _mm_xor_si128(v_x0, v_x1);
  v_x0 = _mm_xor_si128(v_x0, v_y0);
  v_y0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(0));
  v_x0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(17));
  v_x0 = _mm_xor_si128(v_x0, v_x2);
  v_x0 = _mm_xor_si128(v_x0, v_y0);
  v_y0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(0));
  v_x0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(17));
  v_x0 = _mm_xor_si128(v_x0, v_x3);
  v_x0 = _mm_xor_si128(v_x0, v_y0);
  v_x1 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(16));
  v_x2 = _mm_set_epi32((int32_t)(0), (int32_t)(4294967295), (int32_t)(0), (int32_t)(4294967295));
  v_x0 = _mm_srli_si128(v_x0, (int32_t)(8));
  v_x0 = _mm_xor_si128(v_x0, v_x1);
  v_k = _mm_lddqu_si128((const __m128i*)(const void*)(WUFFS_CRC32__IEEE_X86_SSE42_K5ZZ));
  v_x1 = _mm_srli_si128(v_x0, (int32_t)(4));
  v_x0 = _mm_and_si128(v_x0, v_x2);
  v_x0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(0));
  v_x0 = _mm_xor_si128(v_x0, v_x1);
  v_k = _mm_lddqu_si128((const __m128i*)(const void*)(WUFFS_CRC32__IEEE_X86_SSE42_K6MU));
  v_x1 = _mm_and_si128(v_x0, v_x2);
  v_x1 = _mm_clmulepi64_si128(v_x1, v_k, (int32_t)(16));
  v_x1 = _mm_and_si128(v_x1, v_x2);
  v_x1 = _mm_clmulepi64_si128(v_x1, v_k, (int32_t)(0));
  v_x0 = _mm_xor_si128(v_x0, v_x1);
  v_s = _mm_extract_epi32(v_x0, (int32_t)(1));
  v_tail_index = (((uint64_t)(a_x.len)) & 18446744073709551552u);
  if (v_tail_index < ((uint64_t)(a_x.len))) {
    {
      wuffs_base__slice_u8 i_slice_p = wuffs_base__slice_u8__subslice_i(a_x, v_tail_index);
      v_p.ptr = i_slice_p.ptr;
      v_p.len = 1;
      uint8_t* i_end0_p = i_slice_p.ptr + i_slice_p.len;
      while (v_p.ptr < i_end0_p) {
        v_s = (WUFFS_CRC32__IEEE_TABLE[0][(((uint8_t)((v_s & 255))) ^ v_p.ptr[0])] ^ (v_s >> 8));
        v_p.ptr += 1;
      }
      v_p.len = 0;
    }
  }
  self->private_impl.f_state = (4294967295 ^ v_s);
  return wuffs_base__make_empty_struct();
}
#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_64)

#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__CRC32)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__DEFLATE)

// ---------------- Status Codes Implementations

const char wuffs_deflate__error__bad_huffman_code_over_subscribed[] = "#deflate: bad Huffman code (over-subscribed)";
const char wuffs_deflate__error__bad_huffman_code_under_subscribed[] = "#deflate: bad Huffman code (under-subscribed)";
const char wuffs_deflate__error__bad_huffman_code_length_count[] = "#deflate: bad Huffman code length count";
const char wuffs_deflate__error__bad_huffman_code_length_repetition[] = "#deflate: bad Huffman code length repetition";
const char wuffs_deflate__error__bad_huffman_code[] = "#deflate: bad Huffman code";
const char wuffs_deflate__error__bad_huffman_minimum_code_length[] = "#deflate: bad Huffman minimum code length";
const char wuffs_deflate__error__bad_block[] = "#deflate: bad block";
const char wuffs_deflate__error__bad_distance[] = "#deflate: bad distance";
const char wuffs_deflate__error__bad_distance_code_count[] = "#deflate: bad distance code count";
const char wuffs_deflate__error__bad_literal_length_code_count[] = "#deflate: bad literal/length code count";
const char wuffs_deflate__error__inconsistent_stored_block_length[] = "#deflate: inconsistent stored block length";
const char wuffs_deflate__error__missing_end_of_block_code[] = "#deflate: missing end-of-block code";
const char wuffs_deflate__error__no_huffman_codes[] = "#deflate: no Huffman codes";
const char wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state[] = "#deflate: internal error: inconsistent Huffman decoder state";
const char wuffs_deflate__error__internal_error_inconsistent_i_o[] = "#deflate: internal error: inconsistent I/O";
const char wuffs_deflate__error__internal_error_inconsistent_distance[] = "#deflate: internal error: inconsistent distance";
const char wuffs_deflate__error__internal_error_inconsistent_n_bits[] = "#deflate: internal error: inconsistent n_bits";

// ---------------- Private Consts

static const uint8_t
WUFFS_DEFLATE__CODE_ORDER[19] WUFFS_BASE__POTENTIALLY_UNUSED = {
  16, 17, 18, 0, 8, 7, 9, 6,
  10, 5, 11, 4, 12, 3, 13, 2,
  14, 1, 15,
};

static const uint8_t
WUFFS_DEFLATE__REVERSE8[256] WUFFS_BASE__POTENTIALLY_UNUSED = {
  0, 128, 64, 192, 32, 160, 96, 224,
  16, 144, 80, 208, 48, 176, 112, 240,
  8, 136, 72, 200, 40, 168, 104, 232,
  24, 152, 88, 216, 56, 184, 120, 248,
  4, 132, 68, 196, 36, 164, 100, 228,
  20, 148, 84, 212, 52, 180, 116, 244,
  12, 140, 76, 204, 44, 172, 108, 236,
  28, 156, 92, 220, 60, 188, 124, 252,
  2, 130, 66, 194, 34, 162, 98, 226,
  18, 146, 82, 210, 50, 178, 114, 242,
  10, 138, 74, 202, 42, 170, 106, 234,
  26, 154, 90, 218, 58, 186, 122, 250,
  6, 134, 70, 198, 38, 166, 102, 230,
  22, 150, 86, 214, 54, 182, 118, 246,
  14, 142, 78, 206, 46, 174, 110, 238,
  30, 158, 94, 222, 62, 190, 126, 254,
  1, 129, 65, 193, 33, 161, 97, 225,
  17, 145, 81, 209, 49, 177, 113, 241,
  9, 137, 73, 201, 41, 169, 105, 233,
  25, 153, 89, 217, 57, 185, 121, 249,
  5, 133, 69, 197, 37, 165, 101, 229,
  21, 149, 85, 213, 53, 181, 117, 245,
  13, 141, 77, 205, 45, 173, 109, 237,
  29, 157, 93, 221, 61, 189, 125, 253,
  3, 131, 67, 195, 35, 163, 99, 227,
  19, 147, 83, 211, 51, 179, 115, 243,
  11, 139, 75, 203, 43, 171, 107, 235,
  27, 155, 91, 219, 59, 187, 123, 251,
  7, 135, 71, 199, 39, 167, 103, 231,
  23, 151, 87, 215, 55, 183, 119, 247,
  15, 143, 79, 207, 47, 175, 111, 239,
  31, 159, 95, 223, 63, 191, 127, 255,
};

static const uint32_t
WUFFS_DEFLATE__LCODE_MAGIC_NUMBERS[32] WUFFS_BASE__POTENTIALLY_UNUSED = {
  1073741824, 1073742080, 1073742336, 1073742592, 1073742848, 1073743104, 1073743360, 1073743616,
  1073743888, 1073744400, 1073744912, 1073745424, 1073745952, 1073746976, 1073748000, 1073749024,
  1073750064, 1073752112, 1073754160, 1073756208, 1073758272, 1073762368, 1073766464, 1073770560,
  1073774672, 1073782864, 1073791056, 1073799248, 1073807104, 134217728, 134217728, 134217728,
};

static const uint32_t
WUFFS_DEFLATE__DCODE_MAGIC_NUMBERS[32] WUFFS_BASE__POTENTIALLY_UNUSED = {
  1073741824, 1073742080, 1073742336, 1073742592, 1073742864, 1073743376, 1073743904, 1073744928,
  1073745968, 1073748016, 1073750080, 1073754176, 1073758288, 1073766480, 1073774688, 1073791072,
  1073807472, 1073840240, 1073873024, 1073938560, 1074004112, 1074135184, 1074266272, 1074528416,
  1074790576, 1075314864, 1075839168, 1076887744, 1077936336, 1080033488, 134217728, 134217728,
};

#define WUFFS_DEFLATE__HUFFS_TABLE_SIZE 1024

#define WUFFS_DEFLATE__HUFFS_TABLE_MASK 1023

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

static wuffs_base__status
wuffs_deflate__decoder__decode_blocks(
    wuffs_deflate__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_deflate__decoder__decode_uncompressed(
    wuffs_deflate__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_deflate__decoder__init_fixed_huffman(
    wuffs_deflate__decoder* self);

static wuffs_base__status
wuffs_deflate__decoder__init_dynamic_huffman(
    wuffs_deflate__decoder* self,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_deflate__decoder__init_huff(
    wuffs_deflate__decoder* self,
    uint32_t a_which,
    uint32_t a_n_codes0,
    uint32_t a_n_codes1,
    uint32_t a_base_symbol);

static wuffs_base__status
wuffs_deflate__decoder__decode_huffman_fast32(
    wuffs_deflate__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_deflate__decoder__decode_huffman_fast64(
    wuffs_deflate__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_deflate__decoder__decode_huffman_slow(
    wuffs_deflate__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__io_buffer* a_src);

// ---------------- VTables

const wuffs_base__io_transformer__func_ptrs
wuffs_deflate__decoder__func_ptrs_for__wuffs_base__io_transformer = {
  (wuffs_base__empty_struct(*)(void*,
      uint32_t,
      bool))(&wuffs_deflate__decoder__set_quirk_enabled),
  (wuffs_base__status(*)(void*,
      wuffs_base__io_buffer*,
      wuffs_base__io_buffer*,
      wuffs_base__slice_u8))(&wuffs_deflate__decoder__transform_io),
  (wuffs_base__range_ii_u64(*)(const void*))(&wuffs_deflate__decoder__workbuf_len),
};

// ---------------- Initializer Implementations

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_deflate__decoder__initialize(
    wuffs_deflate__decoder* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options){
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (sizeof(*self) != sizeof_star_self) {
    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
  }
  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
  }

  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
    // The whole point of this if-check is to detect an uninitialized *self.
    // We disable the warning on GCC. Clang-5.0 does not have this warning.
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
    if (self->private_impl.magic != 0) {
      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
    }
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
  } else {
    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    } else {
      memset(&(self->private_impl), 0, sizeof(self->private_impl));
    }
  }

  self->private_impl.magic = WUFFS_BASE__MAGIC;
  self->private_impl.vtable_for__wuffs_base__io_transformer.vtable_name =
      wuffs_base__io_transformer__vtable_name;
  self->private_impl.vtable_for__wuffs_base__io_transformer.function_pointers =
      (const void*)(&wuffs_deflate__decoder__func_ptrs_for__wuffs_base__io_transformer);
  return wuffs_base__make_status(NULL);
}

wuffs_deflate__decoder*
wuffs_deflate__decoder__alloc() {
  wuffs_deflate__decoder* x =
      (wuffs_deflate__decoder*)(calloc(sizeof(wuffs_deflate__decoder), 1));
  if (!x) {
    return NULL;
  }
  if (wuffs_deflate__decoder__initialize(
      x, sizeof(wuffs_deflate__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
    free(x);
    return NULL;
  }
  return x;
}

size_t
sizeof__wuffs_deflate__decoder() {
  return sizeof(wuffs_deflate__decoder);
}

// ---------------- Function Implementations

// -------- func deflate.decoder.add_history

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_deflate__decoder__add_history(
    wuffs_deflate__decoder* self,
    wuffs_base__slice_u8 a_hist) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }

  wuffs_base__slice_u8 v_s = {0};
  uint64_t v_n_copied = 0;
  uint32_t v_already_full = 0;

  v_s = a_hist;
  if (((uint64_t)(v_s.len)) >= 32768) {
    v_s = wuffs_base__slice_u8__suffix(v_s, 32768);
    wuffs_base__slice_u8__copy_from_slice(wuffs_base__make_slice_u8(self->private_data.f_history, 32768), v_s);
    self->private_impl.f_history_index = 32768;
  } else {
    v_n_copied = wuffs_base__slice_u8__copy_from_slice(wuffs_base__slice_u8__subslice_i(wuffs_base__make_slice_u8(self->private_data.f_history, 32768), (self->private_impl.f_history_index & 32767)), v_s);
    if (v_n_copied < ((uint64_t)(v_s.len))) {
      v_s = wuffs_base__slice_u8__subslice_i(v_s, v_n_copied);
      v_n_copied = wuffs_base__slice_u8__copy_from_slice(wuffs_base__make_slice_u8(self->private_data.f_history, 32768), v_s);
      self->private_impl.f_history_index = (((uint32_t)((v_n_copied & 32767))) + 32768);
    } else {
      v_already_full = 0;
      if (self->private_impl.f_history_index >= 32768) {
        v_already_full = 32768;
      }
      self->private_impl.f_history_index = ((self->private_impl.f_history_index & 32767) + ((uint32_t)((v_n_copied & 32767))) + v_already_full);
    }
  }
  wuffs_base__slice_u8__copy_from_slice(wuffs_base__make_slice_u8((self->private_data.f_history) + 32768, 257), wuffs_base__make_slice_u8(self->private_data.f_history, 33025));
  return wuffs_base__make_empty_struct();
}

// -------- func deflate.decoder.set_quirk_enabled

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_deflate__decoder__set_quirk_enabled(
    wuffs_deflate__decoder* self,
    uint32_t a_quirk,
    bool a_enabled) {
  return wuffs_base__make_empty_struct();
}

// -------- func deflate.decoder.workbuf_len

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_deflate__decoder__workbuf_len(
    const wuffs_deflate__decoder* self) {
  if (!self) {
    return wuffs_base__utility__empty_range_ii_u64();
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__empty_range_ii_u64();
  }

  return wuffs_base__utility__make_range_ii_u64(1, 1);
}

// -------- func deflate.decoder.transform_io

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_deflate__decoder__transform_io(
    wuffs_deflate__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__slice_u8 a_workbuf) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_dst || !a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 1)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint64_t v_mark = 0;
  wuffs_base__status v_status = wuffs_base__make_status(NULL);

  uint8_t* iop_a_dst = NULL;
  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_dst) {
    io0_a_dst = a_dst->data.ptr;
    io1_a_dst = io0_a_dst + a_dst->meta.wi;
    iop_a_dst = io1_a_dst;
    io2_a_dst = io0_a_dst + a_dst->data.len;
    if (a_dst->meta.closed) {
      io2_a_dst = iop_a_dst;
    }
  }

  uint32_t coro_susp_point = self->private_impl.p_transform_io[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    while (true) {
      v_mark = ((uint64_t)(iop_a_dst - io0_a_dst));
      {
        if (a_dst) {
          a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
        }
        wuffs_base__status t_0 = wuffs_deflate__decoder__decode_blocks(self, a_dst, a_src);
        v_status = t_0;
        if (a_dst) {
          iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
        }
      }
      if ( ! wuffs_base__status__is_suspension(&v_status)) {
        status = v_status;
        if (wuffs_base__status__is_error(&status)) {
          goto exit;
        } else if (wuffs_base__status__is_suspension(&status)) {
          status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
          goto exit;
        }
        goto ok;
      }
      wuffs_deflate__decoder__add_history(self, wuffs_base__io__since(v_mark, ((uint64_t)(iop_a_dst - io0_a_dst)), io0_a_dst));
      status = v_status;
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
    }

    goto ok;
    ok:
    self->private_impl.p_transform_io[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_transform_io[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 1 : 0;

  goto exit;
  exit:
  if (a_dst) {
    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
  }

  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func deflate.decoder.decode_blocks

static wuffs_base__status
wuffs_deflate__decoder__decode_blocks(
    wuffs_deflate__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint32_t v_final = 0;
  uint32_t v_b0 = 0;
  uint32_t v_type = 0;
  wuffs_base__status v_status = wuffs_base__make_status(NULL);

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_blocks[0];
  if (coro_susp_point) {
    v_final = self->private_data.s_decode_blocks[0].v_final;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    label__outer__continue:;
    while (v_final == 0) {
      while (self->private_impl.f_n_bits < 3) {
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint32_t t_0 = *iop_a_src++;
          v_b0 = t_0;
        }
        self->private_impl.f_bits |= (v_b0 << (self->private_impl.f_n_bits & 3));
        self->private_impl.f_n_bits = ((self->private_impl.f_n_bits & 3) + 8);
      }
      v_final = (self->private_impl.f_bits & 1);
      v_type = ((self->private_impl.f_bits >> 1) & 3);
      self->private_impl.f_bits >>= 3;
      self->private_impl.f_n_bits -= 3;
      if (v_type == 0) {
        if (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
        status = wuffs_deflate__decoder__decode_uncompressed(self, a_dst, a_src);
        if (a_src) {
          iop_a_src = a_src->data.ptr + a_src->meta.ri;
        }
        if (status.repr) {
          goto suspend;
        }
        goto label__outer__continue;
      } else if (v_type == 1) {
        v_status = wuffs_deflate__decoder__init_fixed_huffman(self);
        if ( ! wuffs_base__status__is_ok(&v_status)) {
          status = v_status;
          if (wuffs_base__status__is_error(&status)) {
            goto exit;
          } else if (wuffs_base__status__is_suspension(&status)) {
            status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
            goto exit;
          }
          goto ok;
        }
      } else if (v_type == 2) {
        if (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
        status = wuffs_deflate__decoder__init_dynamic_huffman(self, a_src);
        if (a_src) {
          iop_a_src = a_src->data.ptr + a_src->meta.ri;
        }
        if (status.repr) {
          goto suspend;
        }
      } else {
        status = wuffs_base__make_status(wuffs_deflate__error__bad_block);
        goto exit;
      }
      self->private_impl.f_end_of_block = false;
      while (true) {
        if (sizeof(void*) == 4) {
          if (a_src) {
            a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
          }
          v_status = wuffs_deflate__decoder__decode_huffman_fast32(self, a_dst, a_src);
          if (a_src) {
            iop_a_src = a_src->data.ptr + a_src->meta.ri;
          }
        } else {
          if (a_src) {
            a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
          }
          v_status = wuffs_deflate__decoder__decode_huffman_fast64(self, a_dst, a_src);
          if (a_src) {
            iop_a_src = a_src->data.ptr + a_src->meta.ri;
          }
        }
        if (wuffs_base__status__is_error(&v_status)) {
          status = v_status;
          goto exit;
        }
        if (self->private_impl.f_end_of_block) {
          goto label__outer__continue;
        }
        if (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
        status = wuffs_deflate__decoder__decode_huffman_slow(self, a_dst, a_src);
        if (a_src) {
          iop_a_src = a_src->data.ptr + a_src->meta.ri;
        }
        if (status.repr) {
          goto suspend;
        }
        if (self->private_impl.f_end_of_block) {
          goto label__outer__continue;
        }
      }
    }

    goto ok;
    ok:
    self->private_impl.p_decode_blocks[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_blocks[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_data.s_decode_blocks[0].v_final = v_final;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func deflate.decoder.decode_uncompressed

static wuffs_base__status
wuffs_deflate__decoder__decode_uncompressed(
    wuffs_deflate__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint32_t v_length = 0;
  uint32_t v_n_copied = 0;

  uint8_t* iop_a_dst = NULL;
  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_dst) {
    io0_a_dst = a_dst->data.ptr;
    io1_a_dst = io0_a_dst + a_dst->meta.wi;
    iop_a_dst = io1_a_dst;
    io2_a_dst = io0_a_dst + a_dst->data.len;
    if (a_dst->meta.closed) {
      io2_a_dst = iop_a_dst;
    }
  }
  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_uncompressed[0];
  if (coro_susp_point) {
    v_length = self->private_data.s_decode_uncompressed[0].v_length;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if ((self->private_impl.f_n_bits >= 8) || ((self->private_impl.f_bits >> (self->private_impl.f_n_bits & 7)) != 0)) {
      status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_n_bits);
      goto exit;
    }
    self->private_impl.f_n_bits = 0;
    self->private_impl.f_bits = 0;
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      uint32_t t_0;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
        t_0 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
        iop_a_src += 4;
      } else {
        self->private_data.s_decode_uncompressed[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_uncompressed[0].scratch;
          uint32_t num_bits_0 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_0;
          if (num_bits_0 == 24) {
            t_0 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_0 += 8;
          *scratch |= ((uint64_t)(num_bits_0)) << 56;
        }
      }
      v_length = t_0;
    }
    if ((((v_length) & 0xFFFF) + ((v_length) >> (32 - (16)))) != 65535) {
      status = wuffs_base__make_status(wuffs_deflate__error__inconsistent_stored_block_length);
      goto exit;
    }
    v_length = ((v_length) & 0xFFFF);
    while (true) {
      v_n_copied = wuffs_base__io_writer__limited_copy_u32_from_reader(
          &iop_a_dst, io2_a_dst,v_length, &iop_a_src, io2_a_src);
      if (v_length <= v_n_copied) {
        status = wuffs_base__make_status(NULL);
        goto ok;
      }
      v_length -= v_n_copied;
      if (((uint64_t)(io2_a_dst - iop_a_dst)) == 0) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_write);
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(3);
      } else {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(4);
      }
    }

    goto ok;
    ok:
    self->private_impl.p_decode_uncompressed[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_uncompressed[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_data.s_decode_uncompressed[0].v_length = v_length;

  goto exit;
  exit:
  if (a_dst) {
    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
  }
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func deflate.decoder.init_fixed_huffman

static wuffs_base__status
wuffs_deflate__decoder__init_fixed_huffman(
    wuffs_deflate__decoder* self) {
  uint32_t v_i = 0;
  wuffs_base__status v_status = wuffs_base__make_status(NULL);

  while (v_i < 144) {
    self->private_data.f_code_lengths[v_i] = 8;
    v_i += 1;
  }
  while (v_i < 256) {
    self->private_data.f_code_lengths[v_i] = 9;
    v_i += 1;
  }
  while (v_i < 280) {
    self->private_data.f_code_lengths[v_i] = 7;
    v_i += 1;
  }
  while (v_i < 288) {
    self->private_data.f_code_lengths[v_i] = 8;
    v_i += 1;
  }
  while (v_i < 320) {
    self->private_data.f_code_lengths[v_i] = 5;
    v_i += 1;
  }
  v_status = wuffs_deflate__decoder__init_huff(self,
      0,
      0,
      288,
      257);
  if (wuffs_base__status__is_error(&v_status)) {
    return v_status;
  }
  v_status = wuffs_deflate__decoder__init_huff(self,
      1,
      288,
      320,
      0);
  if (wuffs_base__status__is_error(&v_status)) {
    return v_status;
  }
  return wuffs_base__make_status(NULL);
}

// -------- func deflate.decoder.init_dynamic_huffman

static wuffs_base__status
wuffs_deflate__decoder__init_dynamic_huffman(
    wuffs_deflate__decoder* self,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint32_t v_bits = 0;
  uint32_t v_n_bits = 0;
  uint32_t v_b0 = 0;
  uint32_t v_n_lit = 0;
  uint32_t v_n_dist = 0;
  uint32_t v_n_clen = 0;
  uint32_t v_i = 0;
  uint32_t v_b1 = 0;
  wuffs_base__status v_status = wuffs_base__make_status(NULL);
  uint32_t v_mask = 0;
  uint32_t v_table_entry = 0;
  uint32_t v_table_entry_n_bits = 0;
  uint32_t v_b2 = 0;
  uint32_t v_n_extra_bits = 0;
  uint8_t v_rep_symbol = 0;
  uint32_t v_rep_count = 0;
  uint32_t v_b3 = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_init_dynamic_huffman[0];
  if (coro_susp_point) {
    v_bits = self->private_data.s_init_dynamic_huffman[0].v_bits;
    v_n_bits = self->private_data.s_init_dynamic_huffman[0].v_n_bits;
    v_n_lit = self->private_data.s_init_dynamic_huffman[0].v_n_lit;
    v_n_dist = self->private_data.s_init_dynamic_huffman[0].v_n_dist;
    v_n_clen = self->private_data.s_init_dynamic_huffman[0].v_n_clen;
    v_i = self->private_data.s_init_dynamic_huffman[0].v_i;
    v_mask = self->private_data.s_init_dynamic_huffman[0].v_mask;
    v_table_entry = self->private_data.s_init_dynamic_huffman[0].v_table_entry;
    v_n_extra_bits = self->private_data.s_init_dynamic_huffman[0].v_n_extra_bits;
    v_rep_symbol = self->private_data.s_init_dynamic_huffman[0].v_rep_symbol;
    v_rep_count = self->private_data.s_init_dynamic_huffman[0].v_rep_count;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    v_bits = self->private_impl.f_bits;
    v_n_bits = self->private_impl.f_n_bits;
    while (v_n_bits < 14) {
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
          goto suspend;
        }
        uint32_t t_0 = *iop_a_src++;
        v_b0 = t_0;
      }
      v_bits |= (v_b0 << v_n_bits);
      v_n_bits += 8;
    }
    v_n_lit = (((v_bits) & 0x1F) + 257);
    if (v_n_lit > 286) {
      status = wuffs_base__make_status(wuffs_deflate__error__bad_literal_length_code_count);
      goto exit;
    }
    v_bits >>= 5;
    v_n_dist = (((v_bits) & 0x1F) + 1);
    if (v_n_dist > 30) {
      status = wuffs_base__make_status(wuffs_deflate__error__bad_distance_code_count);
      goto exit;
    }
    v_bits >>= 5;
    v_n_clen = (((v_bits) & 0xF) + 4);
    v_bits >>= 4;
    v_n_bits -= 14;
    v_i = 0;
    while (v_i < v_n_clen) {
      while (v_n_bits < 3) {
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint32_t t_1 = *iop_a_src++;
          v_b1 = t_1;
        }
        v_bits |= (v_b1 << v_n_bits);
        v_n_bits += 8;
      }
      self->private_data.f_code_lengths[WUFFS_DEFLATE__CODE_ORDER[v_i]] = ((uint8_t)((v_bits & 7)));
      v_bits >>= 3;
      v_n_bits -= 3;
      v_i += 1;
    }
    while (v_i < 19) {
      self->private_data.f_code_lengths[WUFFS_DEFLATE__CODE_ORDER[v_i]] = 0;
      v_i += 1;
    }
    v_status = wuffs_deflate__decoder__init_huff(self,
        0,
        0,
        19,
        4095);
    if (wuffs_base__status__is_error(&v_status)) {
      status = v_status;
      goto exit;
    }
    v_mask = ((((uint32_t)(1)) << self->private_impl.f_n_huffs_bits[0]) - 1);
    v_i = 0;
    label__0__continue:;
    while (v_i < (v_n_lit + v_n_dist)) {
      while (true) {
        v_table_entry = self->private_data.f_huffs[0][(v_bits & v_mask)];
        v_table_entry_n_bits = (v_table_entry & 15);
        if (v_n_bits >= v_table_entry_n_bits) {
          v_bits >>= v_table_entry_n_bits;
          v_n_bits -= v_table_entry_n_bits;
          goto label__1__break;
        }
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint32_t t_2 = *iop_a_src++;
          v_b2 = t_2;
        }
        v_bits |= (v_b2 << v_n_bits);
        v_n_bits += 8;
      }
      label__1__break:;
      if ((v_table_entry >> 24) != 128) {
        status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
        goto exit;
      }
      v_table_entry = ((v_table_entry >> 8) & 255);
      if (v_table_entry < 16) {
        self->private_data.f_code_lengths[v_i] = ((uint8_t)(v_table_entry));
        v_i += 1;
        goto label__0__continue;
      }
      v_n_extra_bits = 0;
      v_rep_symbol = 0;
      v_rep_count = 0;
      if (v_table_entry == 16) {
        v_n_extra_bits = 2;
        if (v_i <= 0) {
          status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code_length_repetition);
          goto exit;
        }
        v_rep_symbol = (self->private_data.f_code_lengths[(v_i - 1)] & 15);
        v_rep_count = 3;
      } else if (v_table_entry == 17) {
        v_n_extra_bits = 3;
        v_rep_symbol = 0;
        v_rep_count = 3;
      } else if (v_table_entry == 18) {
        v_n_extra_bits = 7;
        v_rep_symbol = 0;
        v_rep_count = 11;
      } else {
        status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
        goto exit;
      }
      while (v_n_bits < v_n_extra_bits) {
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint32_t t_3 = *iop_a_src++;
          v_b3 = t_3;
        }
        v_bits |= (v_b3 << v_n_bits);
        v_n_bits += 8;
      }
      v_rep_count += ((v_bits) & WUFFS_BASE__LOW_BITS_MASK__U32(v_n_extra_bits));
      v_bits >>= v_n_extra_bits;
      v_n_bits -= v_n_extra_bits;
      while (v_rep_count > 0) {
        if (v_i >= (v_n_lit + v_n_dist)) {
          status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code_length_count);
          goto exit;
        }
        self->private_data.f_code_lengths[v_i] = v_rep_symbol;
        v_i += 1;
        v_rep_count -= 1;
      }
    }
    if (v_i != (v_n_lit + v_n_dist)) {
      status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code_length_count);
      goto exit;
    }
    if (self->private_data.f_code_lengths[256] == 0) {
      status = wuffs_base__make_status(wuffs_deflate__error__missing_end_of_block_code);
      goto exit;
    }
    v_status = wuffs_deflate__decoder__init_huff(self,
        0,
        0,
        v_n_lit,
        257);
    if (wuffs_base__status__is_error(&v_status)) {
      status = v_status;
      goto exit;
    }
    v_status = wuffs_deflate__decoder__init_huff(self,
        1,
        v_n_lit,
        (v_n_lit + v_n_dist),
        0);
    if (wuffs_base__status__is_error(&v_status)) {
      status = v_status;
      goto exit;
    }
    self->private_impl.f_bits = v_bits;
    self->private_impl.f_n_bits = v_n_bits;

    goto ok;
    ok:
    self->private_impl.p_init_dynamic_huffman[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_init_dynamic_huffman[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_data.s_init_dynamic_huffman[0].v_bits = v_bits;
  self->private_data.s_init_dynamic_huffman[0].v_n_bits = v_n_bits;
  self->private_data.s_init_dynamic_huffman[0].v_n_lit = v_n_lit;
  self->private_data.s_init_dynamic_huffman[0].v_n_dist = v_n_dist;
  self->private_data.s_init_dynamic_huffman[0].v_n_clen = v_n_clen;
  self->private_data.s_init_dynamic_huffman[0].v_i = v_i;
  self->private_data.s_init_dynamic_huffman[0].v_mask = v_mask;
  self->private_data.s_init_dynamic_huffman[0].v_table_entry = v_table_entry;
  self->private_data.s_init_dynamic_huffman[0].v_n_extra_bits = v_n_extra_bits;
  self->private_data.s_init_dynamic_huffman[0].v_rep_symbol = v_rep_symbol;
  self->private_data.s_init_dynamic_huffman[0].v_rep_count = v_rep_count;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func deflate.decoder.init_huff

static wuffs_base__status
wuffs_deflate__decoder__init_huff(
    wuffs_deflate__decoder* self,
    uint32_t a_which,
    uint32_t a_n_codes0,
    uint32_t a_n_codes1,
    uint32_t a_base_symbol) {
  uint16_t v_counts[16] = {0};
  uint32_t v_i = 0;
  uint32_t v_remaining = 0;
  uint16_t v_offsets[16] = {0};
  uint32_t v_n_symbols = 0;
  uint32_t v_count = 0;
  uint16_t v_symbols[320] = {0};
  uint32_t v_min_cl = 0;
  uint32_t v_max_cl = 0;
  uint32_t v_initial_high_bits = 0;
  uint32_t v_prev_cl = 0;
  uint32_t v_prev_redirect_key = 0;
  uint32_t v_top = 0;
  uint32_t v_next_top = 0;
  uint32_t v_code = 0;
  uint32_t v_key = 0;
  uint32_t v_value = 0;
  uint32_t v_cl = 0;
  uint32_t v_redirect_key = 0;
  uint32_t v_j = 0;
  uint32_t v_reversed_key = 0;
  uint32_t v_symbol = 0;
  uint32_t v_high_bits = 0;
  uint32_t v_delta = 0;

  v_i = a_n_codes0;
  while (v_i < a_n_codes1) {
    if (v_counts[(self->private_data.f_code_lengths[v_i] & 15)] >= 320) {
      return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
    }
#if defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wconversion"
#endif
    v_counts[(self->private_data.f_code_lengths[v_i] & 15)] += 1;
#if defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
    v_i += 1;
  }
  if ((((uint32_t)(v_counts[0])) + a_n_codes0) == a_n_codes1) {
    return wuffs_base__make_status(wuffs_deflate__error__no_huffman_codes);
  }
  v_remaining = 1;
  v_i = 1;
  while (v_i <= 15) {
    if (v_remaining > 1073741824) {
      return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
    }
    v_remaining <<= 1;
    if (v_remaining < ((uint32_t)(v_counts[v_i]))) {
      return wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code_over_subscribed);
    }
    v_remaining -= ((uint32_t)(v_counts[v_i]));
    v_i += 1;
  }
  if (v_remaining != 0) {
    if ((a_which == 1) &&
        (v_counts[1] == 1) &&
        (self->private_data.f_code_lengths[a_n_codes0] == 1) &&
        ((((uint32_t)(v_counts[0])) + a_n_codes0 + 1) == a_n_codes1)) {
      self->private_impl.f_n_huffs_bits[1] = 1;
      self->private_data.f_huffs[1][0] = (WUFFS_DEFLATE__DCODE_MAGIC_NUMBERS[0] | 1);
      self->private_data.f_huffs[1][1] = (WUFFS_DEFLATE__DCODE_MAGIC_NUMBERS[31] | 1);
      return wuffs_base__make_status(NULL);
    }
    return wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code_under_subscribed);
  }
  v_i = 1;
  while (v_i <= 15) {
    v_offsets[v_i] = ((uint16_t)(v_n_symbols));
    v_count = ((uint32_t)(v_counts[v_i]));
    if (v_n_symbols > (320 - v_count)) {
      return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
    }
    v_n_symbols = (v_n_symbols + v_count);
    v_i += 1;
  }
  if (v_n_symbols > 288) {
    return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
  }
  v_i = a_n_codes0;
  while (v_i < a_n_codes1) {
    if (v_i < a_n_codes0) {
      return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
    }
    if (self->private_data.f_code_lengths[v_i] != 0) {
      if (v_offsets[(self->private_data.f_code_lengths[v_i] & 15)] >= 320) {
        return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
      }
      v_symbols[v_offsets[(self->private_data.f_code_lengths[v_i] & 15)]] = ((uint16_t)((v_i - a_n_codes0)));
#if defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wconversion"
#endif
      v_offsets[(self->private_data.f_code_lengths[v_i] & 15)] += 1;
#if defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
    }
    v_i += 1;
  }
  v_min_cl = 1;
  while (true) {
    if (v_counts[v_min_cl] != 0) {
      goto label__0__break;
    }
    if (v_min_cl >= 9) {
      return wuffs_base__make_status(wuffs_deflate__error__bad_huffman_minimum_code_length);
    }
    v_min_cl += 1;
  }
  label__0__break:;
  v_max_cl = 15;
  while (true) {
    if (v_counts[v_max_cl] != 0) {
      goto label__1__break;
    }
    if (v_max_cl <= 1) {
      return wuffs_base__make_status(wuffs_deflate__error__no_huffman_codes);
    }
    v_max_cl -= 1;
  }
  label__1__break:;
  if (v_max_cl <= 9) {
    self->private_impl.f_n_huffs_bits[a_which] = v_max_cl;
  } else {
    self->private_impl.f_n_huffs_bits[a_which] = 9;
  }
  v_i = 0;
  if ((v_n_symbols != ((uint32_t)(v_offsets[v_max_cl]))) || (v_n_symbols != ((uint32_t)(v_offsets[15])))) {
    return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
  }
  if ((a_n_codes0 + ((uint32_t)(v_symbols[0]))) >= 320) {
    return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
  }
  v_initial_high_bits = 512;
  if (v_max_cl < 9) {
    v_initial_high_bits = (((uint32_t)(1)) << v_max_cl);
  }
  v_prev_cl = ((uint32_t)((self->private_data.f_code_lengths[(a_n_codes0 + ((uint32_t)(v_symbols[0])))] & 15)));
  v_prev_redirect_key = 4294967295;
  v_top = 0;
  v_next_top = 512;
  v_code = 0;
  v_key = 0;
  v_value = 0;
  while (true) {
    if ((a_n_codes0 + ((uint32_t)(v_symbols[v_i]))) >= 320) {
      return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
    }
    v_cl = ((uint32_t)((self->private_data.f_code_lengths[(a_n_codes0 + ((uint32_t)(v_symbols[v_i])))] & 15)));
    if (v_cl > v_prev_cl) {
      v_code <<= (v_cl - v_prev_cl);
      if (v_code >= 32768) {
        return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
      }
    }
    v_prev_cl = v_cl;
    v_key = v_code;
    if (v_cl > 9) {
      v_cl -= 9;
      v_redirect_key = ((v_key >> v_cl) & 511);
      v_key = ((v_key) & WUFFS_BASE__LOW_BITS_MASK__U32(v_cl));
      if (v_prev_redirect_key != v_redirect_key) {
        v_prev_redirect_key = v_redirect_key;
        v_remaining = (((uint32_t)(1)) << v_cl);
        v_j = v_prev_cl;
        while (v_j <= 15) {
          if (v_remaining <= ((uint32_t)(v_counts[v_j]))) {
            goto label__2__break;
          }
          v_remaining -= ((uint32_t)(v_counts[v_j]));
          if (v_remaining > 1073741824) {
            return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
          }
          v_remaining <<= 1;
          v_j += 1;
        }
        label__2__break:;
        if ((v_j <= 9) || (15 < v_j)) {
          return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
        }
        v_j -= 9;
        v_initial_high_bits = (((uint32_t)(1)) << v_j);
        v_top = v_next_top;
        if ((v_top + (((uint32_t)(1)) << v_j)) > 1024) {
          return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
        }
        v_next_top = (v_top + (((uint32_t)(1)) << v_j));
        v_redirect_key = (((uint32_t)(WUFFS_DEFLATE__REVERSE8[(v_redirect_key >> 1)])) | ((v_redirect_key & 1) << 8));
        self->private_data.f_huffs[a_which][v_redirect_key] = (268435465 | (v_top << 8) | (v_j << 4));
      }
    }
    if ((v_key >= 512) || (v_counts[v_prev_cl] <= 0)) {
      return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
    }
#if defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wconversion"
#endif
    v_counts[v_prev_cl] -= 1;
#if defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
    v_reversed_key = (((uint32_t)(WUFFS_DEFLATE__REVERSE8[(v_key >> 1)])) | ((v_key & 1) << 8));
    v_reversed_key >>= (9 - v_cl);
    v_symbol = ((uint32_t)(v_symbols[v_i]));
    if (v_symbol == 256) {
      v_value = (536870912 | v_cl);
    } else if ((v_symbol < 256) && (a_which == 0)) {
      v_value = (2147483648 | (v_symbol << 8) | v_cl);
    } else if (v_symbol >= a_base_symbol) {
      v_symbol -= a_base_symbol;
      if (a_which == 0) {
        v_value = (WUFFS_DEFLATE__LCODE_MAGIC_NUMBERS[(v_symbol & 31)] | v_cl);
      } else {
        v_value = (WUFFS_DEFLATE__DCODE_MAGIC_NUMBERS[(v_symbol & 31)] | v_cl);
      }
    } else {
      return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
    }
    v_high_bits = v_initial_high_bits;
    v_delta = (((uint32_t)(1)) << v_cl);
    while (v_high_bits >= v_delta) {
      v_high_bits -= v_delta;
      if ((v_top + ((v_high_bits | v_reversed_key) & 511)) >= 1024) {
        return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
      }
      self->private_data.f_huffs[a_which][(v_top + ((v_high_bits | v_reversed_key) & 511))] = v_value;
    }
    v_i += 1;
    if (v_i >= v_n_symbols) {
      goto label__3__break;
    }
    v_code += 1;
    if (v_code >= 32768) {
      return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
    }
  }
  label__3__break:;
  return wuffs_base__make_status(NULL);
}

// -------- func deflate.decoder.decode_huffman_fast32

static wuffs_base__status
wuffs_deflate__decoder__decode_huffman_fast32(
    wuffs_deflate__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint32_t v_bits = 0;
  uint32_t v_n_bits = 0;
  uint32_t v_table_entry = 0;
  uint32_t v_table_entry_n_bits = 0;
  uint32_t v_lmask = 0;
  uint32_t v_dmask = 0;
  uint32_t v_redir_top = 0;
  uint32_t v_redir_mask = 0;
  uint32_t v_length = 0;
  uint32_t v_dist_minus_1 = 0;
  uint32_t v_hlen = 0;
  uint32_t v_hdist = 0;

  uint8_t* iop_a_dst = NULL;
  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_dst) {
    io0_a_dst = a_dst->data.ptr;
    io1_a_dst = io0_a_dst + a_dst->meta.wi;
    iop_a_dst = io1_a_dst;
    io2_a_dst = io0_a_dst + a_dst->data.len;
    if (a_dst->meta.closed) {
      io2_a_dst = iop_a_dst;
    }
  }
  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  if ((self->private_impl.f_n_bits >= 8) || ((self->private_impl.f_bits >> (self->private_impl.f_n_bits & 7)) != 0)) {
    status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_n_bits);
    goto exit;
  }
  v_bits = self->private_impl.f_bits;
  v_n_bits = self->private_impl.f_n_bits;
  v_lmask = ((((uint32_t)(1)) << self->private_impl.f_n_huffs_bits[0]) - 1);
  v_dmask = ((((uint32_t)(1)) << self->private_impl.f_n_huffs_bits[1]) - 1);
  label__loop__continue:;
  while ((((uint64_t)(io2_a_dst - iop_a_dst)) >= 266) && (((uint64_t)(io2_a_src - iop_a_src)) >= 12)) {
    if (v_n_bits < 15) {
      v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
      iop_a_src += 1;
      v_n_bits += 8;
      v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
      iop_a_src += 1;
      v_n_bits += 8;
    } else {
    }
    v_table_entry = self->private_data.f_huffs[0][(v_bits & v_lmask)];
    v_table_entry_n_bits = (v_table_entry & 15);
    v_bits >>= v_table_entry_n_bits;
    v_n_bits -= v_table_entry_n_bits;
    if ((v_table_entry >> 31) != 0) {
      (wuffs_base__poke_u8be__no_bounds_check(iop_a_dst, ((uint8_t)(((v_table_entry >> 8) & 255)))), iop_a_dst += 1);
      goto label__loop__continue;
    } else if ((v_table_entry >> 30) != 0) {
    } else if ((v_table_entry >> 29) != 0) {
      self->private_impl.f_end_of_block = true;
      goto label__loop__break;
    } else if ((v_table_entry >> 28) != 0) {
      if (v_n_bits < 15) {
        v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
        iop_a_src += 1;
        v_n_bits += 8;
        v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
        iop_a_src += 1;
        v_n_bits += 8;
      } else {
      }
      v_redir_top = ((v_table_entry >> 8) & 65535);
      v_redir_mask = ((((uint32_t)(1)) << ((v_table_entry >> 4) & 15)) - 1);
      v_table_entry = self->private_data.f_huffs[0][((v_redir_top + (v_bits & v_redir_mask)) & 1023)];
      v_table_entry_n_bits = (v_table_entry & 15);
      v_bits >>= v_table_entry_n_bits;
      v_n_bits -= v_table_entry_n_bits;
      if ((v_table_entry >> 31) != 0) {
        (wuffs_base__poke_u8be__no_bounds_check(iop_a_dst, ((uint8_t)(((v_table_entry >> 8) & 255)))), iop_a_dst += 1);
        goto label__loop__continue;
      } else if ((v_table_entry >> 30) != 0) {
      } else if ((v_table_entry >> 29) != 0) {
        self->private_impl.f_end_of_block = true;
        goto label__loop__break;
      } else if ((v_table_entry >> 28) != 0) {
        status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
        goto exit;
      } else if ((v_table_entry >> 27) != 0) {
        status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code);
        goto exit;
      } else {
        status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
        goto exit;
      }
    } else if ((v_table_entry >> 27) != 0) {
      status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code);
      goto exit;
    } else {
      status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
      goto exit;
    }
    v_length = (((v_table_entry >> 8) & 255) + 3);
    v_table_entry_n_bits = ((v_table_entry >> 4) & 15);
    if (v_table_entry_n_bits > 0) {
      if (v_n_bits < 15) {
        v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
        iop_a_src += 1;
        v_n_bits += 8;
        v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
        iop_a_src += 1;
        v_n_bits += 8;
      } else {
      }
      v_length = (((v_length + 253 + ((v_bits) & WUFFS_BASE__LOW_BITS_MASK__U32(v_table_entry_n_bits))) & 255) + 3);
      v_bits >>= v_table_entry_n_bits;
      v_n_bits -= v_table_entry_n_bits;
    } else {
    }
    if (v_n_bits < 15) {
      v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
      iop_a_src += 1;
      v_n_bits += 8;
      v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
      iop_a_src += 1;
      v_n_bits += 8;
    } else {
    }
    v_table_entry = self->private_data.f_huffs[1][(v_bits & v_dmask)];
    v_table_entry_n_bits = (v_table_entry & 15);
    v_bits >>= v_table_entry_n_bits;
    v_n_bits -= v_table_entry_n_bits;
    if ((v_table_entry >> 28) == 1) {
      if (v_n_bits < 15) {
        v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
        iop_a_src += 1;
        v_n_bits += 8;
        v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
        iop_a_src += 1;
        v_n_bits += 8;
      } else {
      }
      v_redir_top = ((v_table_entry >> 8) & 65535);
      v_redir_mask = ((((uint32_t)(1)) << ((v_table_entry >> 4) & 15)) - 1);
      v_table_entry = self->private_data.f_huffs[1][((v_redir_top + (v_bits & v_redir_mask)) & 1023)];
      v_table_entry_n_bits = (v_table_entry & 15);
      v_bits >>= v_table_entry_n_bits;
      v_n_bits -= v_table_entry_n_bits;
    } else {
    }
    if ((v_table_entry >> 24) != 64) {
      if ((v_table_entry >> 24) == 8) {
        status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code);
        goto exit;
      }
      status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
      goto exit;
    }
    v_dist_minus_1 = ((v_table_entry >> 8) & 32767);
    v_table_entry_n_bits = ((v_table_entry >> 4) & 15);
    if (v_n_bits < v_table_entry_n_bits) {
      v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
      iop_a_src += 1;
      v_n_bits += 8;
      v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
      iop_a_src += 1;
      v_n_bits += 8;
    }
    v_dist_minus_1 = ((v_dist_minus_1 + ((v_bits) & WUFFS_BASE__LOW_BITS_MASK__U32(v_table_entry_n_bits))) & 32767);
    v_bits >>= v_table_entry_n_bits;
    v_n_bits -= v_table_entry_n_bits;
    while (true) {
      if (((uint64_t)((v_dist_minus_1 + 1))) > ((uint64_t)(iop_a_dst - io0_a_dst))) {
        v_hlen = 0;
        v_hdist = ((uint32_t)((((uint64_t)((v_dist_minus_1 + 1))) - ((uint64_t)(iop_a_dst - io0_a_dst)))));
        if (v_length > v_hdist) {
          v_length -= v_hdist;
          v_hlen = v_hdist;
        } else {
          v_hlen = v_length;
          v_length = 0;
        }
        if (self->private_impl.f_history_index < v_hdist) {
          status = wuffs_base__make_status(wuffs_deflate__error__bad_distance);
          goto exit;
        }
        v_hdist = (self->private_impl.f_history_index - v_hdist);
        wuffs_base__io_writer__limited_copy_u32_from_slice(
            &iop_a_dst, io2_a_dst,v_hlen, wuffs_base__slice_u8__subslice_i(wuffs_base__make_slice_u8(self->private_data.f_history, 33025), (v_hdist & 32767)));
        if (v_length == 0) {
          goto label__loop__continue;
        }
        if ((((uint64_t)((v_dist_minus_1 + 1))) > ((uint64_t)(iop_a_dst - io0_a_dst))) || (((uint64_t)(v_length)) > ((uint64_t)(io2_a_dst - iop_a_dst))) || (((uint64_t)((v_length + 8))) > ((uint64_t)(io2_a_dst - iop_a_dst)))) {
          status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_distance);
          goto exit;
        }
      }
      if ((v_dist_minus_1 + 1) >= 8) {
        wuffs_base__io_writer__limited_copy_u32_from_history_8_byte_chunks_fast(
            &iop_a_dst, io0_a_dst, io2_a_dst, v_length, (v_dist_minus_1 + 1));
      } else {
        wuffs_base__io_writer__limited_copy_u32_from_history_fast(
            &iop_a_dst, io0_a_dst, io2_a_dst, v_length, (v_dist_minus_1 + 1));
      }
      goto label__0__break;
    }
    label__0__break:;
  }
  label__loop__break:;
  while (v_n_bits >= 8) {
    v_n_bits -= 8;
    if (iop_a_src > io1_a_src) {
      iop_a_src--;
    } else {
      status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_i_o);
      goto exit;
    }
  }
  self->private_impl.f_bits = (v_bits & ((((uint32_t)(1)) << v_n_bits) - 1));
  self->private_impl.f_n_bits = v_n_bits;
  if ((self->private_impl.f_n_bits >= 8) || ((self->private_impl.f_bits >> self->private_impl.f_n_bits) != 0)) {
    status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_n_bits);
    goto exit;
  }
  goto exit;
  exit:
  if (a_dst) {
    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
  }
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func deflate.decoder.decode_huffman_fast64

static wuffs_base__status
wuffs_deflate__decoder__decode_huffman_fast64(
    wuffs_deflate__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint64_t v_bits = 0;
  uint32_t v_n_bits = 0;
  uint32_t v_table_entry = 0;
  uint32_t v_table_entry_n_bits = 0;
  uint64_t v_lmask = 0;
  uint64_t v_dmask = 0;
  uint32_t v_redir_top = 0;
  uint32_t v_redir_mask = 0;
  uint32_t v_length = 0;
  uint32_t v_dist_minus_1 = 0;
  uint32_t v_hlen = 0;
  uint32_t v_hdist = 0;

  uint8_t* iop_a_dst = NULL;
  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_dst) {
    io0_a_dst = a_dst->data.ptr;
    io1_a_dst = io0_a_dst + a_dst->meta.wi;
    iop_a_dst = io1_a_dst;
    io2_a_dst = io0_a_dst + a_dst->data.len;
    if (a_dst->meta.closed) {
      io2_a_dst = iop_a_dst;
    }
  }
  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  if ((self->private_impl.f_n_bits >= 8) || ((self->private_impl.f_bits >> (self->private_impl.f_n_bits & 7)) != 0)) {
    status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_n_bits);
    goto exit;
  }
  v_bits = ((uint64_t)(self->private_impl.f_bits));
  v_n_bits = self->private_impl.f_n_bits;
  v_lmask = ((((uint64_t)(1)) << self->private_impl.f_n_huffs_bits[0]) - 1);
  v_dmask = ((((uint64_t)(1)) << self->private_impl.f_n_huffs_bits[1]) - 1);
  label__loop__continue:;
  while ((((uint64_t)(io2_a_dst - iop_a_dst)) >= 266) && (((uint64_t)(io2_a_src - iop_a_src)) >= 8)) {
    v_bits |= ((uint64_t)(wuffs_base__peek_u64le__no_bounds_check(iop_a_src) << (v_n_bits & 63)));
    iop_a_src += ((63 - (v_n_bits & 63)) >> 3);
    v_n_bits |= 56;
    v_table_entry = self->private_data.f_huffs[0][(v_bits & v_lmask)];
    v_table_entry_n_bits = (v_table_entry & 15);
    v_bits >>= v_table_entry_n_bits;
    v_n_bits -= v_table_entry_n_bits;
    if ((v_table_entry >> 31) != 0) {
      (wuffs_base__poke_u8be__no_bounds_check(iop_a_dst, ((uint8_t)(((v_table_entry >> 8) & 255)))), iop_a_dst += 1);
      goto label__loop__continue;
    } else if ((v_table_entry >> 30) != 0) {
    } else if ((v_table_entry >> 29) != 0) {
      self->private_impl.f_end_of_block = true;
      goto label__loop__break;
    } else if ((v_table_entry >> 28) != 0) {
      v_redir_top = ((v_table_entry >> 8) & 65535);
      v_redir_mask = ((((uint32_t)(1)) << ((v_table_entry >> 4) & 15)) - 1);
      v_table_entry = self->private_data.f_huffs[0][((v_redir_top + (((uint32_t)((v_bits & 4294967295))) & v_redir_mask)) & 1023)];
      v_table_entry_n_bits = (v_table_entry & 15);
      v_bits >>= v_table_entry_n_bits;
      v_n_bits -= v_table_entry_n_bits;
      if ((v_table_entry >> 31) != 0) {
        (wuffs_base__poke_u8be__no_bounds_check(iop_a_dst, ((uint8_t)(((v_table_entry >> 8) & 255)))), iop_a_dst += 1);
        goto label__loop__continue;
      } else if ((v_table_entry >> 30) != 0) {
      } else if ((v_table_entry >> 29) != 0) {
        self->private_impl.f_end_of_block = true;
        goto label__loop__break;
      } else if ((v_table_entry >> 28) != 0) {
        status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
        goto exit;
      } else if ((v_table_entry >> 27) != 0) {
        status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code);
        goto exit;
      } else {
        status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
        goto exit;
      }
    } else if ((v_table_entry >> 27) != 0) {
      status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code);
      goto exit;
    } else {
      status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
      goto exit;
    }
    v_length = (((v_table_entry >> 8) & 255) + 3);
    v_table_entry_n_bits = ((v_table_entry >> 4) & 15);
    if (v_table_entry_n_bits > 0) {
      v_length = (((v_length + 253 + ((uint32_t)(((v_bits) & WUFFS_BASE__LOW_BITS_MASK__U64(v_table_entry_n_bits))))) & 255) + 3);
      v_bits >>= v_table_entry_n_bits;
      v_n_bits -= v_table_entry_n_bits;
    }
    v_table_entry = self->private_data.f_huffs[1][(v_bits & v_dmask)];
    v_table_entry_n_bits = (v_table_entry & 15);
    v_bits >>= v_table_entry_n_bits;
    v_n_bits -= v_table_entry_n_bits;
    if ((v_table_entry >> 28) == 1) {
      v_redir_top = ((v_table_entry >> 8) & 65535);
      v_redir_mask = ((((uint32_t)(1)) << ((v_table_entry >> 4) & 15)) - 1);
      v_table_entry = self->private_data.f_huffs[1][((v_redir_top + (((uint32_t)((v_bits & 4294967295))) & v_redir_mask)) & 1023)];
      v_table_entry_n_bits = (v_table_entry & 15);
      v_bits >>= v_table_entry_n_bits;
      v_n_bits -= v_table_entry_n_bits;
    }
    if ((v_table_entry >> 24) != 64) {
      if ((v_table_entry >> 24) == 8) {
        status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code);
        goto exit;
      }
      status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
      goto exit;
    }
    v_dist_minus_1 = ((v_table_entry >> 8) & 32767);
    v_table_entry_n_bits = ((v_table_entry >> 4) & 15);
    v_dist_minus_1 = ((v_dist_minus_1 + ((uint32_t)(((v_bits) & WUFFS_BASE__LOW_BITS_MASK__U64(v_table_entry_n_bits))))) & 32767);
    v_bits >>= v_table_entry_n_bits;
    v_n_bits -= v_table_entry_n_bits;
    while (true) {
      if (((uint64_t)((v_dist_minus_1 + 1))) > ((uint64_t)(iop_a_dst - io0_a_dst))) {
        v_hlen = 0;
        v_hdist = ((uint32_t)((((uint64_t)((v_dist_minus_1 + 1))) - ((uint64_t)(iop_a_dst - io0_a_dst)))));
        if (v_length > v_hdist) {
          v_length -= v_hdist;
          v_hlen = v_hdist;
        } else {
          v_hlen = v_length;
          v_length = 0;
        }
        if (self->private_impl.f_history_index < v_hdist) {
          status = wuffs_base__make_status(wuffs_deflate__error__bad_distance);
          goto exit;
        }
        v_hdist = (self->private_impl.f_history_index - v_hdist);
        wuffs_base__io_writer__limited_copy_u32_from_slice(
            &iop_a_dst, io2_a_dst,v_hlen, wuffs_base__slice_u8__subslice_i(wuffs_base__make_slice_u8(self->private_data.f_history, 33025), (v_hdist & 32767)));
        if (v_length == 0) {
          goto label__loop__continue;
        }
        if ((((uint64_t)((v_dist_minus_1 + 1))) > ((uint64_t)(iop_a_dst - io0_a_dst))) || (((uint64_t)(v_length)) > ((uint64_t)(io2_a_dst - iop_a_dst))) || (((uint64_t)((v_length + 8))) > ((uint64_t)(io2_a_dst - iop_a_dst)))) {
          status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_distance);
          goto exit;
        }
      }
      if ((v_dist_minus_1 + 1) >= 8) {
        wuffs_base__io_writer__limited_copy_u32_from_history_8_byte_chunks_fast(
            &iop_a_dst, io0_a_dst, io2_a_dst, v_length, (v_dist_minus_1 + 1));
      } else {
        wuffs_base__io_writer__limited_copy_u32_from_history_fast(
            &iop_a_dst, io0_a_dst, io2_a_dst, v_length, (v_dist_minus_1 + 1));
      }
      goto label__0__break;
    }
    label__0__break:;
  }
  label__loop__break:;
  if (v_n_bits > 63) {
    status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_n_bits);
    goto exit;
  }
  while (v_n_bits >= 8) {
    v_n_bits -= 8;
    if (iop_a_src > io1_a_src) {
      iop_a_src--;
    } else {
      status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_i_o);
      goto exit;
    }
  }
  self->private_impl.f_bits = ((uint32_t)((v_bits & ((((uint64_t)(1)) << v_n_bits) - 1))));
  self->private_impl.f_n_bits = v_n_bits;
  if ((self->private_impl.f_n_bits >= 8) || ((self->private_impl.f_bits >> self->private_impl.f_n_bits) != 0)) {
    status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_n_bits);
    goto exit;
  }
  goto exit;
  exit:
  if (a_dst) {
    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
  }
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func deflate.decoder.decode_huffman_slow

static wuffs_base__status
wuffs_deflate__decoder__decode_huffman_slow(
    wuffs_deflate__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint32_t v_bits = 0;
  uint32_t v_n_bits = 0;
  uint32_t v_table_entry = 0;
  uint32_t v_table_entry_n_bits = 0;
  uint32_t v_lmask = 0;
  uint32_t v_dmask = 0;
  uint32_t v_b0 = 0;
  uint32_t v_redir_top = 0;
  uint32_t v_redir_mask = 0;
  uint32_t v_b1 = 0;
  uint32_t v_length = 0;
  uint32_t v_b2 = 0;
  uint32_t v_b3 = 0;
  uint32_t v_b4 = 0;
  uint32_t v_dist_minus_1 = 0;
  uint32_t v_b5 = 0;
  uint32_t v_n_copied = 0;
  uint32_t v_hlen = 0;
  uint32_t v_hdist = 0;

  uint8_t* iop_a_dst = NULL;
  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_dst) {
    io0_a_dst = a_dst->data.ptr;
    io1_a_dst = io0_a_dst + a_dst->meta.wi;
    iop_a_dst = io1_a_dst;
    io2_a_dst = io0_a_dst + a_dst->data.len;
    if (a_dst->meta.closed) {
      io2_a_dst = iop_a_dst;
    }
  }
  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_huffman_slow[0];
  if (coro_susp_point) {
    v_bits = self->private_data.s_decode_huffman_slow[0].v_bits;
    v_n_bits = self->private_data.s_decode_huffman_slow[0].v_n_bits;
    v_table_entry = self->private_data.s_decode_huffman_slow[0].v_table_entry;
    v_table_entry_n_bits = self->private_data.s_decode_huffman_slow[0].v_table_entry_n_bits;
    v_lmask = self->private_data.s_decode_huffman_slow[0].v_lmask;
    v_dmask = self->private_data.s_decode_huffman_slow[0].v_dmask;
    v_redir_top = self->private_data.s_decode_huffman_slow[0].v_redir_top;
    v_redir_mask = self->private_data.s_decode_huffman_slow[0].v_redir_mask;
    v_length = self->private_data.s_decode_huffman_slow[0].v_length;
    v_dist_minus_1 = self->private_data.s_decode_huffman_slow[0].v_dist_minus_1;
    v_hlen = self->private_data.s_decode_huffman_slow[0].v_hlen;
    v_hdist = self->private_data.s_decode_huffman_slow[0].v_hdist;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if ((self->private_impl.f_n_bits >= 8) || ((self->private_impl.f_bits >> (self->private_impl.f_n_bits & 7)) != 0)) {
      status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_n_bits);
      goto exit;
    }
    v_bits = self->private_impl.f_bits;
    v_n_bits = self->private_impl.f_n_bits;
    v_lmask = ((((uint32_t)(1)) << self->private_impl.f_n_huffs_bits[0]) - 1);
    v_dmask = ((((uint32_t)(1)) << self->private_impl.f_n_huffs_bits[1]) - 1);
    label__loop__continue:;
    while ( ! (self->private_impl.p_decode_huffman_slow[0] != 0)) {
      while (true) {
        v_table_entry = self->private_data.f_huffs[0][(v_bits & v_lmask)];
        v_table_entry_n_bits = (v_table_entry & 15);
        if (v_n_bits >= v_table_entry_n_bits) {
          v_bits >>= v_table_entry_n_bits;
          v_n_bits -= v_table_entry_n_bits;
          goto label__0__break;
        }
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint32_t t_0 = *iop_a_src++;
          v_b0 = t_0;
        }
        v_bits |= (v_b0 << v_n_bits);
        v_n_bits += 8;
      }
      label__0__break:;
      if ((v_table_entry >> 31) != 0) {
        self->private_data.s_decode_huffman_slow[0].scratch = ((uint8_t)(((v_table_entry >> 8) & 255)));
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
        if (iop_a_dst == io2_a_dst) {
          status = wuffs_base__make_status(wuffs_base__suspension__short_write);
          goto suspend;
        }
        *iop_a_dst++ = ((uint8_t)(self->private_data.s_decode_huffman_slow[0].scratch));
        goto label__loop__continue;
      } else if ((v_table_entry >> 30) != 0) {
      } else if ((v_table_entry >> 29) != 0) {
        self->private_impl.f_end_of_block = true;
        goto label__loop__break;
      } else if ((v_table_entry >> 28) != 0) {
        v_redir_top = ((v_table_entry >> 8) & 65535);
        v_redir_mask = ((((uint32_t)(1)) << ((v_table_entry >> 4) & 15)) - 1);
        while (true) {
          v_table_entry = self->private_data.f_huffs[0][((v_redir_top + (v_bits & v_redir_mask)) & 1023)];
          v_table_entry_n_bits = (v_table_entry & 15);
          if (v_n_bits >= v_table_entry_n_bits) {
            v_bits >>= v_table_entry_n_bits;
            v_n_bits -= v_table_entry_n_bits;
            goto label__1__break;
          }
          {
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint32_t t_1 = *iop_a_src++;
            v_b1 = t_1;
          }
          v_bits |= (v_b1 << v_n_bits);
          v_n_bits += 8;
        }
        label__1__break:;
        if ((v_table_entry >> 31) != 0) {
          self->private_data.s_decode_huffman_slow[0].scratch = ((uint8_t)(((v_table_entry >> 8) & 255)));
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
          if (iop_a_dst == io2_a_dst) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_write);
            goto suspend;
          }
          *iop_a_dst++ = ((uint8_t)(self->private_data.s_decode_huffman_slow[0].scratch));
          goto label__loop__continue;
        } else if ((v_table_entry >> 30) != 0) {
        } else if ((v_table_entry >> 29) != 0) {
          self->private_impl.f_end_of_block = true;
          goto label__loop__break;
        } else if ((v_table_entry >> 28) != 0) {
          status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
          goto exit;
        } else if ((v_table_entry >> 27) != 0) {
          status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code);
          goto exit;
        } else {
          status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
          goto exit;
        }
      } else if ((v_table_entry >> 27) != 0) {
        status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code);
        goto exit;
      } else {
        status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
        goto exit;
      }
      v_length = (((v_table_entry >> 8) & 255) + 3);
      v_table_entry_n_bits = ((v_table_entry >> 4) & 15);
      if (v_table_entry_n_bits > 0) {
        while (v_n_bits < v_table_entry_n_bits) {
          {
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint32_t t_2 = *iop_a_src++;
            v_b2 = t_2;
          }
          v_bits |= (v_b2 << v_n_bits);
          v_n_bits += 8;
        }
        v_length = (((v_length + 253 + ((v_bits) & WUFFS_BASE__LOW_BITS_MASK__U32(v_table_entry_n_bits))) & 255) + 3);
        v_bits >>= v_table_entry_n_bits;
        v_n_bits -= v_table_entry_n_bits;
      }
      while (true) {
        v_table_entry = self->private_data.f_huffs[1][(v_bits & v_dmask)];
        v_table_entry_n_bits = (v_table_entry & 15);
        if (v_n_bits >= v_table_entry_n_bits) {
          v_bits >>= v_table_entry_n_bits;
          v_n_bits -= v_table_entry_n_bits;
          goto label__2__break;
        }
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint32_t t_3 = *iop_a_src++;
          v_b3 = t_3;
        }
        v_bits |= (v_b3 << v_n_bits);
        v_n_bits += 8;
      }
      label__2__break:;
      if ((v_table_entry >> 28) == 1) {
        v_redir_top = ((v_table_entry >> 8) & 65535);
        v_redir_mask = ((((uint32_t)(1)) << ((v_table_entry >> 4) & 15)) - 1);
        while (true) {
          v_table_entry = self->private_data.f_huffs[1][((v_redir_top + (v_bits & v_redir_mask)) & 1023)];
          v_table_entry_n_bits = (v_table_entry & 15);
          if (v_n_bits >= v_table_entry_n_bits) {
            v_bits >>= v_table_entry_n_bits;
            v_n_bits -= v_table_entry_n_bits;
            goto label__3__break;
          }
          {
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint32_t t_4 = *iop_a_src++;
            v_b4 = t_4;
          }
          v_bits |= (v_b4 << v_n_bits);
          v_n_bits += 8;
        }
        label__3__break:;
      }
      if ((v_table_entry >> 24) != 64) {
        if ((v_table_entry >> 24) == 8) {
          status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code);
          goto exit;
        }
        status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
        goto exit;
      }
      v_dist_minus_1 = ((v_table_entry >> 8) & 32767);
      v_table_entry_n_bits = ((v_table_entry >> 4) & 15);
      if (v_table_entry_n_bits > 0) {
        while (v_n_bits < v_table_entry_n_bits) {
          {
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint32_t t_5 = *iop_a_src++;
            v_b5 = t_5;
          }
          v_bits |= (v_b5 << v_n_bits);
          v_n_bits += 8;
        }
        v_dist_minus_1 = ((v_dist_minus_1 + ((v_bits) & WUFFS_BASE__LOW_BITS_MASK__U32(v_table_entry_n_bits))) & 32767);
        v_bits >>= v_table_entry_n_bits;
        v_n_bits -= v_table_entry_n_bits;
      }
      while (true) {
        if (((uint64_t)((v_dist_minus_1 + 1))) > ((uint64_t)(iop_a_dst - io0_a_dst))) {
          v_hdist = ((uint32_t)((((uint64_t)((v_dist_minus_1 + 1))) - ((uint64_t)(iop_a_dst - io0_a_dst)))));
          if (v_length > v_hdist) {
            v_length -= v_hdist;
            v_hlen = v_hdist;
          } else {
            v_hlen = v_length;
            v_length = 0;
          }
          if (self->private_impl.f_history_index < v_hdist) {
            status = wuffs_base__make_status(wuffs_deflate__error__bad_distance);
            goto exit;
          }
          v_hdist = (self->private_impl.f_history_index - v_hdist);
          while (true) {
            v_n_copied = wuffs_base__io_writer__limited_copy_u32_from_slice(
                &iop_a_dst, io2_a_dst,v_hlen, wuffs_base__slice_u8__subslice_i(wuffs_base__make_slice_u8(self->private_data.f_history, 32768), (v_hdist & 32767)));
            if (v_hlen <= v_n_copied) {
              v_hlen = 0;
              goto label__4__break;
            }
            if (v_n_copied > 0) {
              v_hlen -= v_n_copied;
              v_hdist = (((uint32_t)(v_hdist + v_n_copied)) & 32767);
              if (v_hdist == 0) {
                goto label__4__break;
              }
            }
            status = wuffs_base__make_status(wuffs_base__suspension__short_write);
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(9);
          }
          label__4__break:;
          if (v_hlen > 0) {
            while (true) {
              v_n_copied = wuffs_base__io_writer__limited_copy_u32_from_slice(
                  &iop_a_dst, io2_a_dst,v_hlen, wuffs_base__slice_u8__subslice_i(wuffs_base__make_slice_u8(self->private_data.f_history, 32768), (v_hdist & 32767)));
              if (v_hlen <= v_n_copied) {
                v_hlen = 0;
                goto label__5__break;
              }
              v_hlen -= v_n_copied;
              v_hdist += v_n_copied;
              status = wuffs_base__make_status(wuffs_base__suspension__short_write);
              WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(10);
            }
            label__5__break:;
          }
          if (v_length == 0) {
            goto label__loop__continue;
          }
        }
        v_n_copied = wuffs_base__io_writer__limited_copy_u32_from_history(
            &iop_a_dst, io0_a_dst, io2_a_dst, v_length, (v_dist_minus_1 + 1));
        if (v_length <= v_n_copied) {
          v_length = 0;
          goto label__6__break;
        }
        v_length -= v_n_copied;
        status = wuffs_base__make_status(wuffs_base__suspension__short_write);
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(11);
      }
      label__6__break:;
    }
    label__loop__break:;
    self->private_impl.f_bits = v_bits;
    self->private_impl.f_n_bits = v_n_bits;
    if ((self->private_impl.f_n_bits >= 8) || ((self->private_impl.f_bits >> (self->private_impl.f_n_bits & 7)) != 0)) {
      status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_n_bits);
      goto exit;
    }

    goto ok;
    ok:
    self->private_impl.p_decode_huffman_slow[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_huffman_slow[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_data.s_decode_huffman_slow[0].v_bits = v_bits;
  self->private_data.s_decode_huffman_slow[0].v_n_bits = v_n_bits;
  self->private_data.s_decode_huffman_slow[0].v_table_entry = v_table_entry;
  self->private_data.s_decode_huffman_slow[0].v_table_entry_n_bits = v_table_entry_n_bits;
  self->private_data.s_decode_huffman_slow[0].v_lmask = v_lmask;
  self->private_data.s_decode_huffman_slow[0].v_dmask = v_dmask;
  self->private_data.s_decode_huffman_slow[0].v_redir_top = v_redir_top;
  self->private_data.s_decode_huffman_slow[0].v_redir_mask = v_redir_mask;
  self->private_data.s_decode_huffman_slow[0].v_length = v_length;
  self->private_data.s_decode_huffman_slow[0].v_dist_minus_1 = v_dist_minus_1;
  self->private_data.s_decode_huffman_slow[0].v_hlen = v_hlen;
  self->private_data.s_decode_huffman_slow[0].v_hdist = v_hdist;

  goto exit;
  exit:
  if (a_dst) {
    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
  }
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__DEFLATE)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__LZW)

// ---------------- Status Codes Implementations

const char wuffs_lzw__error__bad_code[] = "#lzw: bad code";
const char wuffs_lzw__error__internal_error_inconsistent_i_o[] = "#lzw: internal error: inconsistent I/O";

// ---------------- Private Consts

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

static wuffs_base__empty_struct
wuffs_lzw__decoder__read_from(
    wuffs_lzw__decoder* self,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_lzw__decoder__write_to(
    wuffs_lzw__decoder* self,
    wuffs_base__io_buffer* a_dst);

// ---------------- VTables

const wuffs_base__io_transformer__func_ptrs
wuffs_lzw__decoder__func_ptrs_for__wuffs_base__io_transformer = {
  (wuffs_base__empty_struct(*)(void*,
      uint32_t,
      bool))(&wuffs_lzw__decoder__set_quirk_enabled),
  (wuffs_base__status(*)(void*,
      wuffs_base__io_buffer*,
      wuffs_base__io_buffer*,
      wuffs_base__slice_u8))(&wuffs_lzw__decoder__transform_io),
  (wuffs_base__range_ii_u64(*)(const void*))(&wuffs_lzw__decoder__workbuf_len),
};

// ---------------- Initializer Implementations

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_lzw__decoder__initialize(
    wuffs_lzw__decoder* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options){
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (sizeof(*self) != sizeof_star_self) {
    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
  }
  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
  }

  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
    // The whole point of this if-check is to detect an uninitialized *self.
    // We disable the warning on GCC. Clang-5.0 does not have this warning.
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
    if (self->private_impl.magic != 0) {
      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
    }
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
  } else {
    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    } else {
      memset(&(self->private_impl), 0, sizeof(self->private_impl));
    }
  }

  self->private_impl.magic = WUFFS_BASE__MAGIC;
  self->private_impl.vtable_for__wuffs_base__io_transformer.vtable_name =
      wuffs_base__io_transformer__vtable_name;
  self->private_impl.vtable_for__wuffs_base__io_transformer.function_pointers =
      (const void*)(&wuffs_lzw__decoder__func_ptrs_for__wuffs_base__io_transformer);
  return wuffs_base__make_status(NULL);
}

wuffs_lzw__decoder*
wuffs_lzw__decoder__alloc() {
  wuffs_lzw__decoder* x =
      (wuffs_lzw__decoder*)(calloc(sizeof(wuffs_lzw__decoder), 1));
  if (!x) {
    return NULL;
  }
  if (wuffs_lzw__decoder__initialize(
      x, sizeof(wuffs_lzw__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
    free(x);
    return NULL;
  }
  return x;
}

size_t
sizeof__wuffs_lzw__decoder() {
  return sizeof(wuffs_lzw__decoder);
}

// ---------------- Function Implementations

// -------- func lzw.decoder.set_quirk_enabled

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_lzw__decoder__set_quirk_enabled(
    wuffs_lzw__decoder* self,
    uint32_t a_quirk,
    bool a_enabled) {
  return wuffs_base__make_empty_struct();
}

// -------- func lzw.decoder.set_literal_width

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_lzw__decoder__set_literal_width(
    wuffs_lzw__decoder* self,
    uint32_t a_lw) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }
  if (a_lw > 8) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_empty_struct();
  }

  self->private_impl.f_set_literal_width_arg = (a_lw + 1);
  return wuffs_base__make_empty_struct();
}

// -------- func lzw.decoder.workbuf_len

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_lzw__decoder__workbuf_len(
    const wuffs_lzw__decoder* self) {
  if (!self) {
    return wuffs_base__utility__empty_range_ii_u64();
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__empty_range_ii_u64();
  }

  return wuffs_base__utility__make_range_ii_u64(0, 0);
}

// -------- func lzw.decoder.transform_io

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_lzw__decoder__transform_io(
    wuffs_lzw__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__slice_u8 a_workbuf) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_dst || !a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 1)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint32_t v_i = 0;

  uint32_t coro_susp_point = self->private_impl.p_transform_io[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    self->private_impl.f_literal_width = 8;
    if (self->private_impl.f_set_literal_width_arg > 0) {
      self->private_impl.f_literal_width = (self->private_impl.f_set_literal_width_arg - 1);
    }
    self->private_impl.f_clear_code = (((uint32_t)(1)) << self->private_impl.f_literal_width);
    self->private_impl.f_end_code = (self->private_impl.f_clear_code + 1);
    self->private_impl.f_save_code = self->private_impl.f_end_code;
    self->private_impl.f_prev_code = self->private_impl.f_end_code;
    self->private_impl.f_width = (self->private_impl.f_literal_width + 1);
    self->private_impl.f_bits = 0;
    self->private_impl.f_n_bits = 0;
    self->private_impl.f_output_ri = 0;
    self->private_impl.f_output_wi = 0;
    v_i = 0;
    while (v_i < self->private_impl.f_clear_code) {
      self->private_data.f_lm1s[v_i] = 0;
      self->private_data.f_suffixes[v_i][0] = ((uint8_t)(v_i));
      v_i += 1;
    }
    label__0__continue:;
    while (true) {
      wuffs_lzw__decoder__read_from(self, a_src);
      if (self->private_impl.f_output_wi > 0) {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
        status = wuffs_lzw__decoder__write_to(self, a_dst);
        if (status.repr) {
          goto suspend;
        }
      }
      if (self->private_impl.f_read_from_return_value == 0) {
        goto label__0__break;
      } else if (self->private_impl.f_read_from_return_value == 1) {
        goto label__0__continue;
      } else if (self->private_impl.f_read_from_return_value == 2) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
      } else if (self->private_impl.f_read_from_return_value == 3) {
        status = wuffs_base__make_status(wuffs_lzw__error__bad_code);
        goto exit;
      } else {
        status = wuffs_base__make_status(wuffs_lzw__error__internal_error_inconsistent_i_o);
        goto exit;
      }
    }
    label__0__break:;

    goto ok;
    ok:
    self->private_impl.p_transform_io[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_transform_io[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 1 : 0;

  goto exit;
  exit:
  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func lzw.decoder.read_from

static wuffs_base__empty_struct
wuffs_lzw__decoder__read_from(
    wuffs_lzw__decoder* self,
    wuffs_base__io_buffer* a_src) {
  uint32_t v_clear_code = 0;
  uint32_t v_end_code = 0;
  uint32_t v_save_code = 0;
  uint32_t v_prev_code = 0;
  uint32_t v_width = 0;
  uint32_t v_bits = 0;
  uint32_t v_n_bits = 0;
  uint32_t v_output_wi = 0;
  uint32_t v_code = 0;
  uint32_t v_c = 0;
  uint32_t v_o = 0;
  uint32_t v_steps = 0;
  uint8_t v_first_byte = 0;
  uint16_t v_lm1_b = 0;
  uint16_t v_lm1_a = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  v_clear_code = self->private_impl.f_clear_code;
  v_end_code = self->private_impl.f_end_code;
  v_save_code = self->private_impl.f_save_code;
  v_prev_code = self->private_impl.f_prev_code;
  v_width = self->private_impl.f_width;
  v_bits = self->private_impl.f_bits;
  v_n_bits = self->private_impl.f_n_bits;
  v_output_wi = self->private_impl.f_output_wi;
  while (true) {
    if (v_n_bits < v_width) {
      if (((uint64_t)(io2_a_src - iop_a_src)) >= 4) {
        v_bits |= ((uint32_t)(wuffs_base__peek_u32le__no_bounds_check(iop_a_src) << v_n_bits));
        iop_a_src += ((31 - v_n_bits) >> 3);
        v_n_bits |= 24;
      } else if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
        self->private_impl.f_read_from_return_value = 2;
        goto label__0__break;
      } else {
        v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
        iop_a_src += 1;
        v_n_bits += 8;
        if (v_n_bits >= v_width) {
        } else if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
          self->private_impl.f_read_from_return_value = 2;
          goto label__0__break;
        } else {
          v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
          iop_a_src += 1;
          v_n_bits += 8;
          if (v_n_bits < v_width) {
            self->private_impl.f_read_from_return_value = 4;
            goto label__0__break;
          }
        }
      }
    }
    v_code = ((v_bits) & WUFFS_BASE__LOW_BITS_MASK__U32(v_width));
    v_bits >>= v_width;
    v_n_bits -= v_width;
    if (v_code < v_clear_code) {
      self->private_data.f_output[v_output_wi] = ((uint8_t)(v_code));
      v_output_wi = ((v_output_wi + 1) & 8191);
      if (v_save_code <= 4095) {
        v_lm1_a = (((uint16_t)(self->private_data.f_lm1s[v_prev_code] + 1)) & 4095);
        self->private_data.f_lm1s[v_save_code] = v_lm1_a;
        if ((v_lm1_a % 8) != 0) {
          self->private_impl.f_prefixes[v_save_code] = self->private_impl.f_prefixes[v_prev_code];
          memcpy(self->private_data.f_suffixes[v_save_code],self->private_data.f_suffixes[v_prev_code], sizeof(self->private_data.f_suffixes[v_save_code]));
          self->private_data.f_suffixes[v_save_code][(v_lm1_a % 8)] = ((uint8_t)(v_code));
        } else {
          self->private_impl.f_prefixes[v_save_code] = ((uint16_t)(v_prev_code));
          self->private_data.f_suffixes[v_save_code][0] = ((uint8_t)(v_code));
        }
        v_save_code += 1;
        if (v_width < 12) {
          v_width += (1 & (v_save_code >> v_width));
        }
        v_prev_code = v_code;
      }
    } else if (v_code <= v_end_code) {
      if (v_code == v_end_code) {
        self->private_impl.f_read_from_return_value = 0;
        goto label__0__break;
      }
      v_save_code = v_end_code;
      v_prev_code = v_end_code;
      v_width = (self->private_impl.f_literal_width + 1);
    } else if (v_code <= v_save_code) {
      v_c = v_code;
      if (v_code == v_save_code) {
        v_c = v_prev_code;
      }
      v_o = ((v_output_wi + (((uint32_t)(self->private_data.f_lm1s[v_c])) & 4294967288)) & 8191);
      v_output_wi = ((v_output_wi + 1 + ((uint32_t)(self->private_data.f_lm1s[v_c]))) & 8191);
      v_steps = (((uint32_t)(self->private_data.f_lm1s[v_c])) >> 3);
      while (true) {
        memcpy((self->private_data.f_output)+(v_o), (self->private_data.f_suffixes[v_c]), 8);
        if (v_steps <= 0) {
          goto label__1__break;
        }
        v_steps -= 1;
        v_o = (((uint32_t)(v_o - 8)) & 8191);
        v_c = ((uint32_t)(self->private_impl.f_prefixes[v_c]));
      }
      label__1__break:;
      v_first_byte = self->private_data.f_suffixes[v_c][0];
      if (v_code == v_save_code) {
        self->private_data.f_output[v_output_wi] = v_first_byte;
        v_output_wi = ((v_output_wi + 1) & 8191);
      }
      if (v_save_code <= 4095) {
        v_lm1_b = (((uint16_t)(self->private_data.f_lm1s[v_prev_code] + 1)) & 4095);
        self->private_data.f_lm1s[v_save_code] = v_lm1_b;
        if ((v_lm1_b % 8) != 0) {
          self->private_impl.f_prefixes[v_save_code] = self->private_impl.f_prefixes[v_prev_code];
          memcpy(self->private_data.f_suffixes[v_save_code],self->private_data.f_suffixes[v_prev_code], sizeof(self->private_data.f_suffixes[v_save_code]));
          self->private_data.f_suffixes[v_save_code][(v_lm1_b % 8)] = v_first_byte;
        } else {
          self->private_impl.f_prefixes[v_save_code] = ((uint16_t)(v_prev_code));
          self->private_data.f_suffixes[v_save_code][0] = ((uint8_t)(v_first_byte));
        }
        v_save_code += 1;
        if (v_width < 12) {
          v_width += (1 & (v_save_code >> v_width));
        }
        v_prev_code = v_code;
      }
    } else {
      self->private_impl.f_read_from_return_value = 3;
      goto label__0__break;
    }
    if (v_output_wi > 4095) {
      self->private_impl.f_read_from_return_value = 1;
      goto label__0__break;
    }
  }
  label__0__break:;
  if (self->private_impl.f_read_from_return_value != 2) {
    while (v_n_bits >= 8) {
      v_n_bits -= 8;
      if (iop_a_src > io1_a_src) {
        iop_a_src--;
      } else {
        self->private_impl.f_read_from_return_value = 4;
        goto label__2__break;
      }
    }
    label__2__break:;
  }
  self->private_impl.f_save_code = v_save_code;
  self->private_impl.f_prev_code = v_prev_code;
  self->private_impl.f_width = v_width;
  self->private_impl.f_bits = v_bits;
  self->private_impl.f_n_bits = v_n_bits;
  self->private_impl.f_output_wi = v_output_wi;
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return wuffs_base__make_empty_struct();
}

// -------- func lzw.decoder.write_to

static wuffs_base__status
wuffs_lzw__decoder__write_to(
    wuffs_lzw__decoder* self,
    wuffs_base__io_buffer* a_dst) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  wuffs_base__slice_u8 v_s = {0};
  uint64_t v_n = 0;

  uint8_t* iop_a_dst = NULL;
  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_dst) {
    io0_a_dst = a_dst->data.ptr;
    io1_a_dst = io0_a_dst + a_dst->meta.wi;
    iop_a_dst = io1_a_dst;
    io2_a_dst = io0_a_dst + a_dst->data.len;
    if (a_dst->meta.closed) {
      io2_a_dst = iop_a_dst;
    }
  }

  uint32_t coro_susp_point = self->private_impl.p_write_to[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    while (self->private_impl.f_output_wi > 0) {
      if (self->private_impl.f_output_ri > self->private_impl.f_output_wi) {
        status = wuffs_base__make_status(wuffs_lzw__error__internal_error_inconsistent_i_o);
        goto exit;
      }
      v_s = wuffs_base__slice_u8__subslice_ij(wuffs_base__make_slice_u8(self->private_data.f_output,
          8199),
          self->private_impl.f_output_ri,
          self->private_impl.f_output_wi);
      v_n = wuffs_base__io_writer__copy_from_slice(&iop_a_dst, io2_a_dst,v_s);
      if (v_n == ((uint64_t)(v_s.len))) {
        self->private_impl.f_output_ri = 0;
        self->private_impl.f_output_wi = 0;
        status = wuffs_base__make_status(NULL);
        goto ok;
      }
      self->private_impl.f_output_ri = (((uint32_t)(self->private_impl.f_output_ri + ((uint32_t)((v_n & 4294967295))))) & 8191);
      status = wuffs_base__make_status(wuffs_base__suspension__short_write);
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
    }

    goto ok;
    ok:
    self->private_impl.p_write_to[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_write_to[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;

  goto exit;
  exit:
  if (a_dst) {
    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
  }

  return status;
}

// -------- func lzw.decoder.flush

WUFFS_BASE__MAYBE_STATIC wuffs_base__slice_u8
wuffs_lzw__decoder__flush(
    wuffs_lzw__decoder* self) {
  if (!self) {
    return wuffs_base__make_slice_u8(NULL, 0);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_slice_u8(NULL, 0);
  }

  wuffs_base__slice_u8 v_s = {0};

  if (self->private_impl.f_output_ri <= self->private_impl.f_output_wi) {
    v_s = wuffs_base__slice_u8__subslice_ij(wuffs_base__make_slice_u8(self->private_data.f_output,
        8199),
        self->private_impl.f_output_ri,
        self->private_impl.f_output_wi);
  }
  self->private_impl.f_output_ri = 0;
  self->private_impl.f_output_wi = 0;
  return v_s;
}

#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__LZW)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__GIF)

// ---------------- Status Codes Implementations

const char wuffs_gif__error__bad_extension_label[] = "#gif: bad extension label";
const char wuffs_gif__error__bad_frame_size[] = "#gif: bad frame size";
const char wuffs_gif__error__bad_graphic_control[] = "#gif: bad graphic control";
const char wuffs_gif__error__bad_header[] = "#gif: bad header";
const char wuffs_gif__error__bad_literal_width[] = "#gif: bad literal width";
const char wuffs_gif__error__bad_palette[] = "#gif: bad palette";
const char wuffs_gif__error__internal_error_inconsistent_ri_wi[] = "#gif: internal error: inconsistent ri/wi";

// ---------------- Private Consts

static const uint32_t
WUFFS_GIF__INTERLACE_START[5] WUFFS_BASE__POTENTIALLY_UNUSED = {
  4294967295, 1, 2, 4, 0,
};

static const uint8_t
WUFFS_GIF__INTERLACE_DELTA[5] WUFFS_BASE__POTENTIALLY_UNUSED = {
  1, 2, 4, 8, 8,
};

static const uint8_t
WUFFS_GIF__INTERLACE_COUNT[5] WUFFS_BASE__POTENTIALLY_UNUSED = {
  0, 1, 2, 4, 8,
};

static const uint8_t
WUFFS_GIF__ANIMEXTS1DOT0[11] WUFFS_BASE__POTENTIALLY_UNUSED = {
  65, 78, 73, 77, 69, 88, 84, 83,
  49, 46, 48,
};

static const uint8_t
WUFFS_GIF__NETSCAPE2DOT0[11] WUFFS_BASE__POTENTIALLY_UNUSED = {
  78, 69, 84, 83, 67, 65, 80, 69,
  50, 46, 48,
};

static const uint8_t
WUFFS_GIF__ICCRGBG1012[11] WUFFS_BASE__POTENTIALLY_UNUSED = {
  73, 67, 67, 82, 71, 66, 71, 49,
  48, 49, 50,
};

static const uint8_t
WUFFS_GIF__XMPDATAXMP[11] WUFFS_BASE__POTENTIALLY_UNUSED = {
  88, 77, 80, 32, 68, 97, 116, 97,
  88, 77, 80,
};

#define WUFFS_GIF__QUIRKS_BASE 1041635328

#define WUFFS_GIF__QUIRKS_COUNT 7

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

static wuffs_base__status
wuffs_gif__decoder__skip_frame(
    wuffs_gif__decoder* self,
    wuffs_base__io_buffer* a_src);

static wuffs_base__empty_struct
wuffs_gif__decoder__reset_gc(
    wuffs_gif__decoder* self);

static wuffs_base__status
wuffs_gif__decoder__decode_up_to_id_part1(
    wuffs_gif__decoder* self,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_gif__decoder__decode_header(
    wuffs_gif__decoder* self,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_gif__decoder__decode_lsd(
    wuffs_gif__decoder* self,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_gif__decoder__decode_extension(
    wuffs_gif__decoder* self,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_gif__decoder__skip_blocks(
    wuffs_gif__decoder* self,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_gif__decoder__decode_ae(
    wuffs_gif__decoder* self,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_gif__decoder__decode_gc(
    wuffs_gif__decoder* self,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_gif__decoder__decode_id_part0(
    wuffs_gif__decoder* self,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_gif__decoder__decode_id_part1(
    wuffs_gif__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__pixel_blend a_blend);

static wuffs_base__status
wuffs_gif__decoder__decode_id_part2(
    wuffs_gif__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__slice_u8 a_workbuf);

static wuffs_base__status
wuffs_gif__decoder__copy_to_image_buffer(
    wuffs_gif__decoder* self,
    wuffs_base__pixel_buffer* a_pb,
    wuffs_base__slice_u8 a_src);

// ---------------- VTables

const wuffs_base__image_decoder__func_ptrs
wuffs_gif__decoder__func_ptrs_for__wuffs_base__image_decoder = {
  (wuffs_base__status(*)(void*,
      wuffs_base__pixel_buffer*,
      wuffs_base__io_buffer*,
      wuffs_base__pixel_blend,
      wuffs_base__slice_u8,
      wuffs_base__decode_frame_options*))(&wuffs_gif__decoder__decode_frame),
  (wuffs_base__status(*)(void*,
      wuffs_base__frame_config*,
      wuffs_base__io_buffer*))(&wuffs_gif__decoder__decode_frame_config),
  (wuffs_base__status(*)(void*,
      wuffs_base__image_config*,
      wuffs_base__io_buffer*))(&wuffs_gif__decoder__decode_image_config),
  (wuffs_base__rect_ie_u32(*)(const void*))(&wuffs_gif__decoder__frame_dirty_rect),
  (uint32_t(*)(const void*))(&wuffs_gif__decoder__num_animation_loops),
  (uint64_t(*)(const void*))(&wuffs_gif__decoder__num_decoded_frame_configs),
  (uint64_t(*)(const void*))(&wuffs_gif__decoder__num_decoded_frames),
  (wuffs_base__status(*)(void*,
      uint64_t,
      uint64_t))(&wuffs_gif__decoder__restart_frame),
  (wuffs_base__empty_struct(*)(void*,
      uint32_t,
      bool))(&wuffs_gif__decoder__set_quirk_enabled),
  (wuffs_base__empty_struct(*)(void*,
      uint32_t,
      bool))(&wuffs_gif__decoder__set_report_metadata),
  (wuffs_base__status(*)(void*,
      wuffs_base__io_buffer*,
      wuffs_base__more_information*,
      wuffs_base__io_buffer*))(&wuffs_gif__decoder__tell_me_more),
  (wuffs_base__range_ii_u64(*)(const void*))(&wuffs_gif__decoder__workbuf_len),
};

// ---------------- Initializer Implementations

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_gif__decoder__initialize(
    wuffs_gif__decoder* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options){
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (sizeof(*self) != sizeof_star_self) {
    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
  }
  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
  }

  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
    // The whole point of this if-check is to detect an uninitialized *self.
    // We disable the warning on GCC. Clang-5.0 does not have this warning.
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
    if (self->private_impl.magic != 0) {
      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
    }
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
  } else {
    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    } else {
      memset(&(self->private_impl), 0, sizeof(self->private_impl));
    }
  }

  {
    wuffs_base__status z = wuffs_lzw__decoder__initialize(
        &self->private_data.f_lzw, sizeof(self->private_data.f_lzw), WUFFS_VERSION, options);
    if (z.repr) {
      return z;
    }
  }
  self->private_impl.magic = WUFFS_BASE__MAGIC;
  self->private_impl.vtable_for__wuffs_base__image_decoder.vtable_name =
      wuffs_base__image_decoder__vtable_name;
  self->private_impl.vtable_for__wuffs_base__image_decoder.function_pointers =
      (const void*)(&wuffs_gif__decoder__func_ptrs_for__wuffs_base__image_decoder);
  return wuffs_base__make_status(NULL);
}

wuffs_gif__decoder*
wuffs_gif__decoder__alloc() {
  wuffs_gif__decoder* x =
      (wuffs_gif__decoder*)(calloc(sizeof(wuffs_gif__decoder), 1));
  if (!x) {
    return NULL;
  }
  if (wuffs_gif__decoder__initialize(
      x, sizeof(wuffs_gif__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
    free(x);
    return NULL;
  }
  return x;
}

size_t
sizeof__wuffs_gif__decoder() {
  return sizeof(wuffs_gif__decoder);
}

// ---------------- Function Implementations

// -------- func gif.decoder.set_quirk_enabled

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_gif__decoder__set_quirk_enabled(
    wuffs_gif__decoder* self,
    uint32_t a_quirk,
    bool a_enabled) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }

  if ((self->private_impl.f_call_sequence == 0) && (a_quirk >= 1041635328)) {
    a_quirk -= 1041635328;
    if (a_quirk < 7) {
      self->private_impl.f_quirks[a_quirk] = a_enabled;
    }
  }
  return wuffs_base__make_empty_struct();
}

// -------- func gif.decoder.decode_image_config

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_gif__decoder__decode_image_config(
    wuffs_gif__decoder* self,
    wuffs_base__image_config* a_dst,
    wuffs_base__io_buffer* a_src) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 1)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  bool v_ffio = false;

  uint32_t coro_susp_point = self->private_impl.p_decode_image_config[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_call_sequence == 0) {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      status = wuffs_gif__decoder__decode_header(self, a_src);
      if (status.repr) {
        goto suspend;
      }
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
      status = wuffs_gif__decoder__decode_lsd(self, a_src);
      if (status.repr) {
        goto suspend;
      }
    } else if (self->private_impl.f_call_sequence != 2) {
      status = wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
      goto exit;
    }
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
    status = wuffs_gif__decoder__decode_up_to_id_part1(self, a_src);
    if (status.repr) {
      goto suspend;
    }
    v_ffio =  ! self->private_impl.f_gc_has_transparent_index;
    if ( ! self->private_impl.f_quirks[2]) {
      v_ffio = (v_ffio &&
          (self->private_impl.f_frame_rect_x0 == 0) &&
          (self->private_impl.f_frame_rect_y0 == 0) &&
          (self->private_impl.f_frame_rect_x1 == self->private_impl.f_width) &&
          (self->private_impl.f_frame_rect_y1 == self->private_impl.f_height));
    } else if (v_ffio) {
      self->private_impl.f_black_color_u32_argb_premul = 4278190080;
    }
    if (self->private_impl.f_background_color_u32_argb_premul == 77) {
      self->private_impl.f_background_color_u32_argb_premul = self->private_impl.f_black_color_u32_argb_premul;
    }
    if (a_dst != NULL) {
      wuffs_base__image_config__set(
          a_dst,
          2198077448,
          0,
          self->private_impl.f_width,
          self->private_impl.f_height,
          self->private_impl.f_frame_config_io_position,
          v_ffio);
    }
    self->private_impl.f_call_sequence = 3;

    goto ok;
    ok:
    self->private_impl.p_decode_image_config[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_image_config[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 1 : 0;

  goto exit;
  exit:
  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func gif.decoder.set_report_metadata

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_gif__decoder__set_report_metadata(
    wuffs_gif__decoder* self,
    uint32_t a_fourcc,
    bool a_report) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }

  if (a_fourcc == 1229144912) {
    self->private_impl.f_report_metadata_iccp = a_report;
  } else if (a_fourcc == 1481461792) {
    self->private_impl.f_report_metadata_xmp = a_report;
  }
  return wuffs_base__make_empty_struct();
}

// -------- func gif.decoder.tell_me_more

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_gif__decoder__tell_me_more(
    wuffs_gif__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__more_information* a_minfo,
    wuffs_base__io_buffer* a_src) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_dst || !a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 2)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint64_t v_chunk_length = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_tell_me_more[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_call_sequence != 1) {
      status = wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
      goto exit;
    }
    if (self->private_impl.f_metadata_fourcc == 0) {
      status = wuffs_base__make_status(wuffs_base__error__no_more_information);
      goto exit;
    }
    while (true) {
      label__0__continue:;
      while (true) {
        if (wuffs_base__u64__sat_add(a_src->meta.pos, ((uint64_t)(iop_a_src - io0_a_src))) != self->private_impl.f_metadata_io_position) {
          if (a_minfo != NULL) {
            wuffs_base__more_information__set(a_minfo,
                2,
                0,
                self->private_impl.f_metadata_io_position,
                0,
                0);
          }
          status = wuffs_base__make_status(wuffs_base__suspension__mispositioned_read);
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
          goto label__0__continue;
        }
        if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
          if (a_minfo != NULL) {
            wuffs_base__more_information__set(a_minfo,
                0,
                0,
                0,
                0,
                0);
          }
          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
          goto label__0__continue;
        }
        goto label__0__break;
      }
      label__0__break:;
      v_chunk_length = ((uint64_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src)));
      if (v_chunk_length <= 0) {
        iop_a_src += 1;
        goto label__1__break;
      }
      if (self->private_impl.f_metadata_fourcc == 1481461792) {
        v_chunk_length += 1;
      } else {
        iop_a_src += 1;
      }
      self->private_impl.f_metadata_io_position = wuffs_base__u64__sat_add(wuffs_base__u64__sat_add(a_src->meta.pos, ((uint64_t)(iop_a_src - io0_a_src))), v_chunk_length);
      if (a_minfo != NULL) {
        wuffs_base__more_information__set(a_minfo,
            3,
            self->private_impl.f_metadata_fourcc,
            0,
            wuffs_base__u64__sat_add(a_src->meta.pos, ((uint64_t)(iop_a_src - io0_a_src))),
            self->private_impl.f_metadata_io_position);
      }
      status = wuffs_base__make_status(wuffs_base__suspension__even_more_information);
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(3);
    }
    label__1__break:;
    if (a_minfo != NULL) {
      wuffs_base__more_information__set(a_minfo,
          3,
          self->private_impl.f_metadata_fourcc,
          0,
          self->private_impl.f_metadata_io_position,
          self->private_impl.f_metadata_io_position);
    }
    self->private_impl.f_call_sequence = 2;
    self->private_impl.f_metadata_fourcc = 0;
    self->private_impl.f_metadata_io_position = 0;
    status = wuffs_base__make_status(NULL);
    goto ok;

    goto ok;
    ok:
    self->private_impl.p_tell_me_more[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_tell_me_more[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 2 : 0;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func gif.decoder.num_animation_loops

WUFFS_BASE__MAYBE_STATIC uint32_t
wuffs_gif__decoder__num_animation_loops(
    const wuffs_gif__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  if (self->private_impl.f_seen_num_loops) {
    return self->private_impl.f_num_loops;
  }
  return 1;
}

// -------- func gif.decoder.num_decoded_frame_configs

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_gif__decoder__num_decoded_frame_configs(
    const wuffs_gif__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  return self->private_impl.f_num_decoded_frame_configs_value;
}

// -------- func gif.decoder.num_decoded_frames

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_gif__decoder__num_decoded_frames(
    const wuffs_gif__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  return self->private_impl.f_num_decoded_frames_value;
}

// -------- func gif.decoder.frame_dirty_rect

WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
wuffs_gif__decoder__frame_dirty_rect(
    const wuffs_gif__decoder* self) {
  if (!self) {
    return wuffs_base__utility__empty_rect_ie_u32();
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__empty_rect_ie_u32();
  }

  return wuffs_base__utility__make_rect_ie_u32(
      wuffs_base__u32__min(self->private_impl.f_frame_rect_x0, self->private_impl.f_width),
      wuffs_base__u32__min(self->private_impl.f_frame_rect_y0, self->private_impl.f_height),
      wuffs_base__u32__min(self->private_impl.f_frame_rect_x1, self->private_impl.f_width),
      wuffs_base__u32__min(self->private_impl.f_dirty_max_excl_y, self->private_impl.f_height));
}

// -------- func gif.decoder.workbuf_len

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_gif__decoder__workbuf_len(
    const wuffs_gif__decoder* self) {
  if (!self) {
    return wuffs_base__utility__empty_range_ii_u64();
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__empty_range_ii_u64();
  }

  return wuffs_base__utility__make_range_ii_u64(0, 0);
}

// -------- func gif.decoder.restart_frame

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_gif__decoder__restart_frame(
    wuffs_gif__decoder* self,
    uint64_t a_index,
    uint64_t a_io_position) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }

  if (self->private_impl.f_call_sequence < 3) {
    return wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
  }
  self->private_impl.f_delayed_num_decoded_frames = false;
  self->private_impl.f_end_of_data = false;
  self->private_impl.f_restarted = true;
  self->private_impl.f_frame_config_io_position = a_io_position;
  self->private_impl.f_num_decoded_frame_configs_value = a_index;
  self->private_impl.f_num_decoded_frames_value = a_index;
  wuffs_gif__decoder__reset_gc(self);
  return wuffs_base__make_status(NULL);
}

// -------- func gif.decoder.decode_frame_config

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_gif__decoder__decode_frame_config(
    wuffs_gif__decoder* self,
    wuffs_base__frame_config* a_dst,
    wuffs_base__io_buffer* a_src) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 3)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint32_t v_background_color = 0;
  uint8_t v_flags = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_frame_config[0];
  if (coro_susp_point) {
    v_background_color = self->private_data.s_decode_frame_config[0].v_background_color;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    self->private_impl.f_ignore_metadata = true;
    self->private_impl.f_dirty_max_excl_y = 0;
    if ( ! self->private_impl.f_end_of_data) {
      if (self->private_impl.f_call_sequence == 0) {
        if (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
        status = wuffs_gif__decoder__decode_image_config(self, NULL, a_src);
        if (a_src) {
          iop_a_src = a_src->data.ptr + a_src->meta.ri;
        }
        if (status.repr) {
          goto suspend;
        }
      } else if (self->private_impl.f_call_sequence != 3) {
        if (self->private_impl.f_call_sequence == 4) {
          if (a_src) {
            a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
          }
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
          status = wuffs_gif__decoder__skip_frame(self, a_src);
          if (a_src) {
            iop_a_src = a_src->data.ptr + a_src->meta.ri;
          }
          if (status.repr) {
            goto suspend;
          }
        }
        if (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
        status = wuffs_gif__decoder__decode_up_to_id_part1(self, a_src);
        if (a_src) {
          iop_a_src = a_src->data.ptr + a_src->meta.ri;
        }
        if (status.repr) {
          goto suspend;
        }
      }
    }
    if (self->private_impl.f_end_of_data) {
      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
      goto ok;
    }
    v_background_color = self->private_impl.f_black_color_u32_argb_premul;
    if ( ! self->private_impl.f_gc_has_transparent_index) {
      v_background_color = self->private_impl.f_background_color_u32_argb_premul;
      if (self->private_impl.f_quirks[1] && (self->private_impl.f_num_decoded_frame_configs_value == 0)) {
        while (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(4);
        }
        v_flags = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
        if ((v_flags & 128) != 0) {
          v_background_color = self->private_impl.f_black_color_u32_argb_premul;
        }
      }
    }
    if (a_dst != NULL) {
      wuffs_base__frame_config__set(
          a_dst,
          wuffs_base__utility__make_rect_ie_u32(
          wuffs_base__u32__min(self->private_impl.f_frame_rect_x0, self->private_impl.f_width),
          wuffs_base__u32__min(self->private_impl.f_frame_rect_y0, self->private_impl.f_height),
          wuffs_base__u32__min(self->private_impl.f_frame_rect_x1, self->private_impl.f_width),
          wuffs_base__u32__min(self->private_impl.f_frame_rect_y1, self->private_impl.f_height)),
          ((wuffs_base__flicks)(self->private_impl.f_gc_duration)),
          self->private_impl.f_num_decoded_frame_configs_value,
          self->private_impl.f_frame_config_io_position,
          self->private_impl.f_gc_disposal,
          ! self->private_impl.f_gc_has_transparent_index,
          false,
          v_background_color);
    }
    wuffs_base__u64__sat_add_indirect(&self->private_impl.f_num_decoded_frame_configs_value, 1);
    self->private_impl.f_call_sequence = 4;

    goto ok;
    ok:
    self->private_impl.p_decode_frame_config[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_frame_config[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 3 : 0;
  self->private_data.s_decode_frame_config[0].v_background_color = v_background_color;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func gif.decoder.skip_frame

static wuffs_base__status
wuffs_gif__decoder__skip_frame(
    wuffs_gif__decoder* self,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint8_t v_flags = 0;
  uint8_t v_lw = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_skip_frame[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      uint8_t t_0 = *iop_a_src++;
      v_flags = t_0;
    }
    if ((v_flags & 128) != 0) {
      self->private_data.s_skip_frame[0].scratch = (((uint32_t)(3)) << (1 + (v_flags & 7)));
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
      if (self->private_data.s_skip_frame[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
        self->private_data.s_skip_frame[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
        iop_a_src = io2_a_src;
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      iop_a_src += self->private_data.s_skip_frame[0].scratch;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      uint8_t t_1 = *iop_a_src++;
      v_lw = t_1;
    }
    if (v_lw > 8) {
      status = wuffs_base__make_status(wuffs_gif__error__bad_literal_width);
      goto exit;
    }
    if (a_src) {
      a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
    }
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
    status = wuffs_gif__decoder__skip_blocks(self, a_src);
    if (a_src) {
      iop_a_src = a_src->data.ptr + a_src->meta.ri;
    }
    if (status.repr) {
      goto suspend;
    }
    if (self->private_impl.f_quirks[0]) {
      self->private_impl.f_delayed_num_decoded_frames = true;
    } else {
      wuffs_base__u64__sat_add_indirect(&self->private_impl.f_num_decoded_frames_value, 1);
    }
    wuffs_gif__decoder__reset_gc(self);

    goto ok;
    ok:
    self->private_impl.p_skip_frame[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_skip_frame[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func gif.decoder.decode_frame

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_gif__decoder__decode_frame(
    wuffs_gif__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__pixel_blend a_blend,
    wuffs_base__slice_u8 a_workbuf,
    wuffs_base__decode_frame_options* a_opts) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_dst || !a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 4)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint32_t coro_susp_point = self->private_impl.p_decode_frame[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    self->private_impl.f_ignore_metadata = true;
    if (self->private_impl.f_call_sequence != 4) {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      status = wuffs_gif__decoder__decode_frame_config(self, NULL, a_src);
      if (status.repr) {
        goto suspend;
      }
    }
    if (self->private_impl.f_quirks[5] && ((self->private_impl.f_frame_rect_x0 == self->private_impl.f_frame_rect_x1) || (self->private_impl.f_frame_rect_y0 == self->private_impl.f_frame_rect_y1))) {
      status = wuffs_base__make_status(wuffs_gif__error__bad_frame_size);
      goto exit;
    }
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
    status = wuffs_gif__decoder__decode_id_part1(self, a_dst, a_src, a_blend);
    if (status.repr) {
      goto suspend;
    }
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
    status = wuffs_gif__decoder__decode_id_part2(self, a_dst, a_src, a_workbuf);
    if (status.repr) {
      goto suspend;
    }
    wuffs_base__u64__sat_add_indirect(&self->private_impl.f_num_decoded_frames_value, 1);
    wuffs_gif__decoder__reset_gc(self);

    goto ok;
    ok:
    self->private_impl.p_decode_frame[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_frame[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 4 : 0;

  goto exit;
  exit:
  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func gif.decoder.reset_gc

static wuffs_base__empty_struct
wuffs_gif__decoder__reset_gc(
    wuffs_gif__decoder* self) {
  self->private_impl.f_call_sequence = 5;
  self->private_impl.f_gc_has_transparent_index = false;
  self->private_impl.f_gc_transparent_index = 0;
  self->private_impl.f_gc_disposal = 0;
  self->private_impl.f_gc_duration = 0;
  return wuffs_base__make_empty_struct();
}

// -------- func gif.decoder.decode_up_to_id_part1

static wuffs_base__status
wuffs_gif__decoder__decode_up_to_id_part1(
    wuffs_gif__decoder* self,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint8_t v_block_type = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_up_to_id_part1[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if ( ! self->private_impl.f_restarted) {
      if (self->private_impl.f_call_sequence != 2) {
        self->private_impl.f_frame_config_io_position = wuffs_base__u64__sat_add(a_src->meta.pos, ((uint64_t)(iop_a_src - io0_a_src)));
      }
    } else if (self->private_impl.f_frame_config_io_position != wuffs_base__u64__sat_add(a_src->meta.pos, ((uint64_t)(iop_a_src - io0_a_src)))) {
      status = wuffs_base__make_status(wuffs_base__error__bad_restart);
      goto exit;
    } else {
      self->private_impl.f_restarted = false;
    }
    while (true) {
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
          goto suspend;
        }
        uint8_t t_0 = *iop_a_src++;
        v_block_type = t_0;
      }
      if (v_block_type == 33) {
        if (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
        status = wuffs_gif__decoder__decode_extension(self, a_src);
        if (a_src) {
          iop_a_src = a_src->data.ptr + a_src->meta.ri;
        }
        if (status.repr) {
          goto suspend;
        }
      } else if (v_block_type == 44) {
        if (self->private_impl.f_delayed_num_decoded_frames) {
          self->private_impl.f_delayed_num_decoded_frames = false;
          wuffs_base__u64__sat_add_indirect(&self->private_impl.f_num_decoded_frames_value, 1);
        }
        if (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
        status = wuffs_gif__decoder__decode_id_part0(self, a_src);
        if (a_src) {
          iop_a_src = a_src->data.ptr + a_src->meta.ri;
        }
        if (status.repr) {
          goto suspend;
        }
        goto label__0__break;
      } else {
        if (self->private_impl.f_delayed_num_decoded_frames) {
          self->private_impl.f_delayed_num_decoded_frames = false;
          wuffs_base__u64__sat_add_indirect(&self->private_impl.f_num_decoded_frames_value, 1);
        }
        self->private_impl.f_end_of_data = true;
        goto label__0__break;
      }
    }
    label__0__break:;

    goto ok;
    ok:
    self->private_impl.p_decode_up_to_id_part1[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_up_to_id_part1[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func gif.decoder.decode_header

static wuffs_base__status
wuffs_gif__decoder__decode_header(
    wuffs_gif__decoder* self,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint8_t v_c[6] = {0};
  uint32_t v_i = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_header[0];
  if (coro_susp_point) {
    memcpy(v_c, self->private_data.s_decode_header[0].v_c, sizeof(v_c));
    v_i = self->private_data.s_decode_header[0].v_i;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    while (v_i < 6) {
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
          goto suspend;
        }
        uint8_t t_0 = *iop_a_src++;
        v_c[v_i] = t_0;
      }
      v_i += 1;
    }
    if ((v_c[0] != 71) ||
        (v_c[1] != 73) ||
        (v_c[2] != 70) ||
        (v_c[3] != 56) ||
        ((v_c[4] != 55) && (v_c[4] != 57)) ||
        (v_c[5] != 97)) {
      status = wuffs_base__make_status(wuffs_gif__error__bad_header);
      goto exit;
    }

    goto ok;
    ok:
    self->private_impl.p_decode_header[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_header[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  memcpy(self->private_data.s_decode_header[0].v_c, v_c, sizeof(v_c));
  self->private_data.s_decode_header[0].v_i = v_i;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func gif.decoder.decode_lsd

static wuffs_base__status
wuffs_gif__decoder__decode_lsd(
    wuffs_gif__decoder* self,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint8_t v_flags = 0;
  uint8_t v_background_color_index = 0;
  uint32_t v_num_palette_entries = 0;
  uint32_t v_i = 0;
  uint32_t v_j = 0;
  uint32_t v_argb = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_lsd[0];
  if (coro_susp_point) {
    v_flags = self->private_data.s_decode_lsd[0].v_flags;
    v_background_color_index = self->private_data.s_decode_lsd[0].v_background_color_index;
    v_num_palette_entries = self->private_data.s_decode_lsd[0].v_num_palette_entries;
    v_i = self->private_data.s_decode_lsd[0].v_i;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      uint32_t t_0;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
        t_0 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
        iop_a_src += 2;
      } else {
        self->private_data.s_decode_lsd[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_lsd[0].scratch;
          uint32_t num_bits_0 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_0;
          if (num_bits_0 == 8) {
            t_0 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_0 += 8;
          *scratch |= ((uint64_t)(num_bits_0)) << 56;
        }
      }
      self->private_impl.f_width = t_0;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
      uint32_t t_1;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
        t_1 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
        iop_a_src += 2;
      } else {
        self->private_data.s_decode_lsd[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_lsd[0].scratch;
          uint32_t num_bits_1 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_1;
          if (num_bits_1 == 8) {
            t_1 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_1 += 8;
          *scratch |= ((uint64_t)(num_bits_1)) << 56;
        }
      }
      self->private_impl.f_height = t_1;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      uint8_t t_2 = *iop_a_src++;
      v_flags = t_2;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      uint8_t t_3 = *iop_a_src++;
      v_background_color_index = t_3;
    }
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
    if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
      status = wuffs_base__make_status(wuffs_base__suspension__short_read);
      goto suspend;
    }
    iop_a_src++;
    v_i = 0;
    self->private_impl.f_has_global_palette = ((v_flags & 128) != 0);
    if (self->private_impl.f_has_global_palette) {
      v_num_palette_entries = (((uint32_t)(1)) << (1 + (v_flags & 7)));
      while (v_i < v_num_palette_entries) {
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
          uint32_t t_4;
          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 3)) {
            t_4 = ((uint32_t)(wuffs_base__peek_u24be__no_bounds_check(iop_a_src)));
            iop_a_src += 3;
          } else {
            self->private_data.s_decode_lsd[0].scratch = 0;
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(9);
            while (true) {
              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                goto suspend;
              }
              uint64_t* scratch = &self->private_data.s_decode_lsd[0].scratch;
              uint32_t num_bits_4 = ((uint32_t)(*scratch & 0xFF));
              *scratch >>= 8;
              *scratch <<= 8;
              *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_4);
              if (num_bits_4 == 16) {
                t_4 = ((uint32_t)(*scratch >> 40));
                break;
              }
              num_bits_4 += 8;
              *scratch |= ((uint64_t)(num_bits_4));
            }
          }
          v_argb = t_4;
        }
        v_argb |= 4278190080;
        self->private_data.f_palettes[0][((4 * v_i) + 0)] = ((uint8_t)(((v_argb >> 0) & 255)));
        self->private_data.f_palettes[0][((4 * v_i) + 1)] = ((uint8_t)(((v_argb >> 8) & 255)));
        self->private_data.f_palettes[0][((4 * v_i) + 2)] = ((uint8_t)(((v_argb >> 16) & 255)));
        self->private_data.f_palettes[0][((4 * v_i) + 3)] = ((uint8_t)(((v_argb >> 24) & 255)));
        v_i += 1;
      }
      if (self->private_impl.f_quirks[2]) {
        if ((v_background_color_index != 0) && (((uint32_t)(v_background_color_index)) < v_num_palette_entries)) {
          v_j = (4 * ((uint32_t)(v_background_color_index)));
          self->private_impl.f_background_color_u32_argb_premul = ((((uint32_t)(self->private_data.f_palettes[0][(v_j + 0)])) << 0) |
              (((uint32_t)(self->private_data.f_palettes[0][(v_j + 1)])) << 8) |
              (((uint32_t)(self->private_data.f_palettes[0][(v_j + 2)])) << 16) |
              (((uint32_t)(self->private_data.f_palettes[0][(v_j + 3)])) << 24));
        } else {
          self->private_impl.f_background_color_u32_argb_premul = 77;
        }
      }
    }
    while (v_i < 256) {
      self->private_data.f_palettes[0][((4 * v_i) + 0)] = 0;
      self->private_data.f_palettes[0][((4 * v_i) + 1)] = 0;
      self->private_data.f_palettes[0][((4 * v_i) + 2)] = 0;
      self->private_data.f_palettes[0][((4 * v_i) + 3)] = 255;
      v_i += 1;
    }

    goto ok;
    ok:
    self->private_impl.p_decode_lsd[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_lsd[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_data.s_decode_lsd[0].v_flags = v_flags;
  self->private_data.s_decode_lsd[0].v_background_color_index = v_background_color_index;
  self->private_data.s_decode_lsd[0].v_num_palette_entries = v_num_palette_entries;
  self->private_data.s_decode_lsd[0].v_i = v_i;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func gif.decoder.decode_extension

static wuffs_base__status
wuffs_gif__decoder__decode_extension(
    wuffs_gif__decoder* self,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint8_t v_label = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_extension[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      uint8_t t_0 = *iop_a_src++;
      v_label = t_0;
    }
    if (v_label == 249) {
      if (a_src) {
        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
      }
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
      status = wuffs_gif__decoder__decode_gc(self, a_src);
      if (a_src) {
        iop_a_src = a_src->data.ptr + a_src->meta.ri;
      }
      if (status.repr) {
        goto suspend;
      }
      status = wuffs_base__make_status(NULL);
      goto ok;
    } else if (v_label == 255) {
      if (a_src) {
        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
      }
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
      status = wuffs_gif__decoder__decode_ae(self, a_src);
      if (a_src) {
        iop_a_src = a_src->data.ptr + a_src->meta.ri;
      }
      if (status.repr) {
        goto suspend;
      }
      status = wuffs_base__make_status(NULL);
      goto ok;
    }
    if (a_src) {
      a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
    }
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
    status = wuffs_gif__decoder__skip_blocks(self, a_src);
    if (a_src) {
      iop_a_src = a_src->data.ptr + a_src->meta.ri;
    }
    if (status.repr) {
      goto suspend;
    }

    goto ok;
    ok:
    self->private_impl.p_decode_extension[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_extension[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func gif.decoder.skip_blocks

static wuffs_base__status
wuffs_gif__decoder__skip_blocks(
    wuffs_gif__decoder* self,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint8_t v_block_size = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_skip_blocks[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    while (true) {
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
          goto suspend;
        }
        uint8_t t_0 = *iop_a_src++;
        v_block_size = t_0;
      }
      if (v_block_size == 0) {
        status = wuffs_base__make_status(NULL);
        goto ok;
      }
      self->private_data.s_skip_blocks[0].scratch = ((uint32_t)(v_block_size));
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
      if (self->private_data.s_skip_blocks[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
        self->private_data.s_skip_blocks[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
        iop_a_src = io2_a_src;
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      iop_a_src += self->private_data.s_skip_blocks[0].scratch;
    }

    goto ok;
    ok:
    self->private_impl.p_skip_blocks[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_skip_blocks[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func gif.decoder.decode_ae

static wuffs_base__status
wuffs_gif__decoder__decode_ae(
    wuffs_gif__decoder* self,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint8_t v_c = 0;
  uint8_t v_block_size = 0;
  bool v_is_animexts = false;
  bool v_is_netscape = false;
  bool v_is_iccp = false;
  bool v_is_xmp = false;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_ae[0];
  if (coro_susp_point) {
    v_block_size = self->private_data.s_decode_ae[0].v_block_size;
    v_is_animexts = self->private_data.s_decode_ae[0].v_is_animexts;
    v_is_netscape = self->private_data.s_decode_ae[0].v_is_netscape;
    v_is_iccp = self->private_data.s_decode_ae[0].v_is_iccp;
    v_is_xmp = self->private_data.s_decode_ae[0].v_is_xmp;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    while (true) {
      if (self->private_impl.f_metadata_fourcc != 0) {
        status = wuffs_base__make_status(wuffs_base__note__metadata_reported);
        goto ok;
      }
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
          goto suspend;
        }
        uint8_t t_0 = *iop_a_src++;
        v_block_size = t_0;
      }
      if (v_block_size == 0) {
        status = wuffs_base__make_status(NULL);
        goto ok;
      }
      if (v_block_size != 11) {
        self->private_data.s_decode_ae[0].scratch = ((uint32_t)(v_block_size));
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
        if (self->private_data.s_decode_ae[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
          self->private_data.s_decode_ae[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
          iop_a_src = io2_a_src;
          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
          goto suspend;
        }
        iop_a_src += self->private_data.s_decode_ae[0].scratch;
        goto label__goto_done__break;
      }
      v_is_animexts = true;
      v_is_netscape = true;
      v_is_iccp = true;
      v_is_xmp = true;
      v_block_size = 0;
      while (v_block_size < 11) {
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint8_t t_1 = *iop_a_src++;
          v_c = t_1;
        }
        v_is_animexts = (v_is_animexts && (v_c == WUFFS_GIF__ANIMEXTS1DOT0[v_block_size]));
        v_is_netscape = (v_is_netscape && (v_c == WUFFS_GIF__NETSCAPE2DOT0[v_block_size]));
        v_is_iccp = (v_is_iccp && (v_c == WUFFS_GIF__ICCRGBG1012[v_block_size]));
        v_is_xmp = (v_is_xmp && (v_c == WUFFS_GIF__XMPDATAXMP[v_block_size]));
#if defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wconversion"
#endif
        v_block_size += 1;
#if defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
      }
      if (v_is_animexts || v_is_netscape) {
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint8_t t_2 = *iop_a_src++;
          v_block_size = t_2;
        }
        if (v_block_size != 3) {
          self->private_data.s_decode_ae[0].scratch = ((uint32_t)(v_block_size));
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
          if (self->private_data.s_decode_ae[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
            self->private_data.s_decode_ae[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
            iop_a_src = io2_a_src;
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          iop_a_src += self->private_data.s_decode_ae[0].scratch;
          goto label__goto_done__break;
        }
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint8_t t_3 = *iop_a_src++;
          v_c = t_3;
        }
        if (v_c != 1) {
          self->private_data.s_decode_ae[0].scratch = 2;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
          if (self->private_data.s_decode_ae[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
            self->private_data.s_decode_ae[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
            iop_a_src = io2_a_src;
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          iop_a_src += self->private_data.s_decode_ae[0].scratch;
          goto label__goto_done__break;
        }
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
          uint32_t t_4;
          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
            t_4 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
            iop_a_src += 2;
          } else {
            self->private_data.s_decode_ae[0].scratch = 0;
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(9);
            while (true) {
              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                goto suspend;
              }
              uint64_t* scratch = &self->private_data.s_decode_ae[0].scratch;
              uint32_t num_bits_4 = ((uint32_t)(*scratch >> 56));
              *scratch <<= 8;
              *scratch >>= 8;
              *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_4;
              if (num_bits_4 == 8) {
                t_4 = ((uint32_t)(*scratch));
                break;
              }
              num_bits_4 += 8;
              *scratch |= ((uint64_t)(num_bits_4)) << 56;
            }
          }
          self->private_impl.f_num_loops = t_4;
        }
        self->private_impl.f_seen_num_loops = true;
        if ((0 < self->private_impl.f_num_loops) && (self->private_impl.f_num_loops <= 65535)) {
          self->private_impl.f_num_loops += 1;
        }
      } else if (self->private_impl.f_ignore_metadata) {
      } else if (v_is_iccp && self->private_impl.f_report_metadata_iccp) {
        self->private_impl.f_metadata_fourcc = 1229144912;
        self->private_impl.f_metadata_io_position = wuffs_base__u64__sat_add(a_src->meta.pos, ((uint64_t)(iop_a_src - io0_a_src)));
        self->private_impl.f_call_sequence = 1;
        status = wuffs_base__make_status(wuffs_base__note__metadata_reported);
        goto ok;
      } else if (v_is_xmp && self->private_impl.f_report_metadata_xmp) {
        self->private_impl.f_metadata_fourcc = 1481461792;
        self->private_impl.f_metadata_io_position = wuffs_base__u64__sat_add(a_src->meta.pos, ((uint64_t)(iop_a_src - io0_a_src)));
        self->private_impl.f_call_sequence = 1;
        status = wuffs_base__make_status(wuffs_base__note__metadata_reported);
        goto ok;
      }
      goto label__goto_done__break;
    }
    label__goto_done__break:;
    if (a_src) {
      a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
    }
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(10);
    status = wuffs_gif__decoder__skip_blocks(self, a_src);
    if (a_src) {
      iop_a_src = a_src->data.ptr + a_src->meta.ri;
    }
    if (status.repr) {
      goto suspend;
    }

    goto ok;
    ok:
    self->private_impl.p_decode_ae[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_ae[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_data.s_decode_ae[0].v_block_size = v_block_size;
  self->private_data.s_decode_ae[0].v_is_animexts = v_is_animexts;
  self->private_data.s_decode_ae[0].v_is_netscape = v_is_netscape;
  self->private_data.s_decode_ae[0].v_is_iccp = v_is_iccp;
  self->private_data.s_decode_ae[0].v_is_xmp = v_is_xmp;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func gif.decoder.decode_gc

static wuffs_base__status
wuffs_gif__decoder__decode_gc(
    wuffs_gif__decoder* self,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint8_t v_c = 0;
  uint8_t v_flags = 0;
  uint16_t v_gc_duration_centiseconds = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_gc[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      uint8_t t_0 = *iop_a_src++;
      v_c = t_0;
    }
    if (v_c != 4) {
      status = wuffs_base__make_status(wuffs_gif__error__bad_graphic_control);
      goto exit;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      uint8_t t_1 = *iop_a_src++;
      v_flags = t_1;
    }
    self->private_impl.f_gc_has_transparent_index = ((v_flags & 1) != 0);
    v_flags = ((v_flags >> 2) & 7);
    if (v_flags == 2) {
      self->private_impl.f_gc_disposal = 1;
    } else if ((v_flags == 3) || (v_flags == 4)) {
      self->private_impl.f_gc_disposal = 2;
    } else {
      self->private_impl.f_gc_disposal = 0;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
      uint16_t t_2;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
        t_2 = wuffs_base__peek_u16le__no_bounds_check(iop_a_src);
        iop_a_src += 2;
      } else {
        self->private_data.s_decode_gc[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_gc[0].scratch;
          uint32_t num_bits_2 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_2;
          if (num_bits_2 == 8) {
            t_2 = ((uint16_t)(*scratch));
            break;
          }
          num_bits_2 += 8;
          *scratch |= ((uint64_t)(num_bits_2)) << 56;
        }
      }
      v_gc_duration_centiseconds = t_2;
    }
    self->private_impl.f_gc_duration = (((uint64_t)(v_gc_duration_centiseconds)) * 7056000);
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      uint8_t t_3 = *iop_a_src++;
      self->private_impl.f_gc_transparent_index = t_3;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      uint8_t t_4 = *iop_a_src++;
      v_c = t_4;
    }
    if (v_c != 0) {
      status = wuffs_base__make_status(wuffs_gif__error__bad_graphic_control);
      goto exit;
    }

    goto ok;
    ok:
    self->private_impl.p_decode_gc[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_gc[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func gif.decoder.decode_id_part0

static wuffs_base__status
wuffs_gif__decoder__decode_id_part0(
    wuffs_gif__decoder* self,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_id_part0[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      uint32_t t_0;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
        t_0 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
        iop_a_src += 2;
      } else {
        self->private_data.s_decode_id_part0[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_id_part0[0].scratch;
          uint32_t num_bits_0 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_0;
          if (num_bits_0 == 8) {
            t_0 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_0 += 8;
          *scratch |= ((uint64_t)(num_bits_0)) << 56;
        }
      }
      self->private_impl.f_frame_rect_x0 = t_0;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
      uint32_t t_1;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
        t_1 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
        iop_a_src += 2;
      } else {
        self->private_data.s_decode_id_part0[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_id_part0[0].scratch;
          uint32_t num_bits_1 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_1;
          if (num_bits_1 == 8) {
            t_1 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_1 += 8;
          *scratch |= ((uint64_t)(num_bits_1)) << 56;
        }
      }
      self->private_impl.f_frame_rect_y0 = t_1;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
      uint32_t t_2;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
        t_2 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
        iop_a_src += 2;
      } else {
        self->private_data.s_decode_id_part0[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_id_part0[0].scratch;
          uint32_t num_bits_2 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_2;
          if (num_bits_2 == 8) {
            t_2 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_2 += 8;
          *scratch |= ((uint64_t)(num_bits_2)) << 56;
        }
      }
      self->private_impl.f_frame_rect_x1 = t_2;
    }
    self->private_impl.f_frame_rect_x1 += self->private_impl.f_frame_rect_x0;
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
      uint32_t t_3;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
        t_3 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
        iop_a_src += 2;
      } else {
        self->private_data.s_decode_id_part0[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_id_part0[0].scratch;
          uint32_t num_bits_3 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_3;
          if (num_bits_3 == 8) {
            t_3 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_3 += 8;
          *scratch |= ((uint64_t)(num_bits_3)) << 56;
        }
      }
      self->private_impl.f_frame_rect_y1 = t_3;
    }
    self->private_impl.f_frame_rect_y1 += self->private_impl.f_frame_rect_y0;
    self->private_impl.f_dst_x = self->private_impl.f_frame_rect_x0;
    self->private_impl.f_dst_y = self->private_impl.f_frame_rect_y0;
    if ((self->private_impl.f_call_sequence == 0) &&  ! self->private_impl.f_quirks[4]) {
      self->private_impl.f_width = wuffs_base__u32__max(self->private_impl.f_width, self->private_impl.f_frame_rect_x1);
      self->private_impl.f_height = wuffs_base__u32__max(self->private_impl.f_height, self->private_impl.f_frame_rect_y1);
    }

    goto ok;
    ok:
    self->private_impl.p_decode_id_part0[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_id_part0[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func gif.decoder.decode_id_part1

static wuffs_base__status
wuffs_gif__decoder__decode_id_part1(
    wuffs_gif__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__pixel_blend a_blend) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint8_t v_flags = 0;
  uint8_t v_which_palette = 0;
  uint32_t v_num_palette_entries = 0;
  uint32_t v_i = 0;
  uint32_t v_argb = 0;
  wuffs_base__status v_status = wuffs_base__make_status(NULL);
  uint8_t v_lw = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_id_part1[0];
  if (coro_susp_point) {
    v_which_palette = self->private_data.s_decode_id_part1[0].v_which_palette;
    v_num_palette_entries = self->private_data.s_decode_id_part1[0].v_num_palette_entries;
    v_i = self->private_data.s_decode_id_part1[0].v_i;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      uint8_t t_0 = *iop_a_src++;
      v_flags = t_0;
    }
    if ((v_flags & 64) != 0) {
      self->private_impl.f_interlace = 4;
    } else {
      self->private_impl.f_interlace = 0;
    }
    v_which_palette = 1;
    if ((v_flags & 128) != 0) {
      v_num_palette_entries = (((uint32_t)(1)) << (1 + (v_flags & 7)));
      v_i = 0;
      while (v_i < v_num_palette_entries) {
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
          uint32_t t_1;
          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 3)) {
            t_1 = ((uint32_t)(wuffs_base__peek_u24be__no_bounds_check(iop_a_src)));
            iop_a_src += 3;
          } else {
            self->private_data.s_decode_id_part1[0].scratch = 0;
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
            while (true) {
              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                goto suspend;
              }
              uint64_t* scratch = &self->private_data.s_decode_id_part1[0].scratch;
              uint32_t num_bits_1 = ((uint32_t)(*scratch & 0xFF));
              *scratch >>= 8;
              *scratch <<= 8;
              *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_1);
              if (num_bits_1 == 16) {
                t_1 = ((uint32_t)(*scratch >> 40));
                break;
              }
              num_bits_1 += 8;
              *scratch |= ((uint64_t)(num_bits_1));
            }
          }
          v_argb = t_1;
        }
        v_argb |= 4278190080;
        self->private_data.f_palettes[1][((4 * v_i) + 0)] = ((uint8_t)(((v_argb >> 0) & 255)));
        self->private_data.f_palettes[1][((4 * v_i) + 1)] = ((uint8_t)(((v_argb >> 8) & 255)));
        self->private_data.f_palettes[1][((4 * v_i) + 2)] = ((uint8_t)(((v_argb >> 16) & 255)));
        self->private_data.f_palettes[1][((4 * v_i) + 3)] = ((uint8_t)(((v_argb >> 24) & 255)));
        v_i += 1;
      }
      while (v_i < 256) {
        self->private_data.f_palettes[1][((4 * v_i) + 0)] = 0;
        self->private_data.f_palettes[1][((4 * v_i) + 1)] = 0;
        self->private_data.f_palettes[1][((4 * v_i) + 2)] = 0;
        self->private_data.f_palettes[1][((4 * v_i) + 3)] = 255;
        v_i += 1;
      }
    } else if (self->private_impl.f_quirks[6] &&  ! self->private_impl.f_has_global_palette) {
      status = wuffs_base__make_status(wuffs_gif__error__bad_palette);
      goto exit;
    } else if (self->private_impl.f_gc_has_transparent_index) {
      wuffs_base__slice_u8__copy_from_slice(wuffs_base__make_slice_u8(self->private_data.f_palettes[1], 1024), wuffs_base__make_slice_u8(self->private_data.f_palettes[0], 1024));
    } else {
      v_which_palette = 0;
    }
    if (self->private_impl.f_gc_has_transparent_index) {
      self->private_data.f_palettes[1][((4 * ((uint32_t)(self->private_impl.f_gc_transparent_index))) + 0)] = 0;
      self->private_data.f_palettes[1][((4 * ((uint32_t)(self->private_impl.f_gc_transparent_index))) + 1)] = 0;
      self->private_data.f_palettes[1][((4 * ((uint32_t)(self->private_impl.f_gc_transparent_index))) + 2)] = 0;
      self->private_data.f_palettes[1][((4 * ((uint32_t)(self->private_impl.f_gc_transparent_index))) + 3)] = 0;
    }
    v_status = wuffs_base__pixel_swizzler__prepare(&self->private_impl.f_swizzler,
        wuffs_base__pixel_buffer__pixel_format(a_dst),
        wuffs_base__pixel_buffer__palette_or_else(a_dst, wuffs_base__make_slice_u8(self->private_data.f_dst_palette, 1024)),
        wuffs_base__utility__make_pixel_format(2198077448),
        wuffs_base__make_slice_u8(self->private_data.f_palettes[v_which_palette], 1024),
        a_blend);
    if ( ! wuffs_base__status__is_ok(&v_status)) {
      status = v_status;
      if (wuffs_base__status__is_error(&status)) {
        goto exit;
      } else if (wuffs_base__status__is_suspension(&status)) {
        status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
        goto exit;
      }
      goto ok;
    }
    if (self->private_impl.f_previous_lzw_decode_ended_abruptly) {
      wuffs_base__ignore_status(wuffs_lzw__decoder__initialize(&self->private_data.f_lzw, sizeof (wuffs_lzw__decoder), WUFFS_VERSION, 0));
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      uint8_t t_2 = *iop_a_src++;
      v_lw = t_2;
    }
    if (v_lw > 8) {
      status = wuffs_base__make_status(wuffs_gif__error__bad_literal_width);
      goto exit;
    }
    wuffs_lzw__decoder__set_literal_width(&self->private_data.f_lzw, ((uint32_t)(v_lw)));
    self->private_impl.f_previous_lzw_decode_ended_abruptly = true;

    goto ok;
    ok:
    self->private_impl.p_decode_id_part1[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_id_part1[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_data.s_decode_id_part1[0].v_which_palette = v_which_palette;
  self->private_data.s_decode_id_part1[0].v_num_palette_entries = v_num_palette_entries;
  self->private_data.s_decode_id_part1[0].v_i = v_i;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func gif.decoder.decode_id_part2

static wuffs_base__status
wuffs_gif__decoder__decode_id_part2(
    wuffs_gif__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__slice_u8 a_workbuf) {
  wuffs_base__io_buffer empty_io_buffer = wuffs_base__empty_io_buffer();

  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint64_t v_block_size = 0;
  bool v_need_block_size = false;
  uint32_t v_n_copied = 0;
  uint64_t v_n_compressed = 0;
  wuffs_base__io_buffer u_r = wuffs_base__empty_io_buffer();
  wuffs_base__io_buffer* v_r = &u_r;
  const uint8_t* iop_v_r WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io0_v_r WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_v_r WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_v_r WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint64_t v_mark = 0;
  wuffs_base__status v_lzw_status = wuffs_base__make_status(NULL);
  wuffs_base__status v_copy_status = wuffs_base__make_status(NULL);
  wuffs_base__slice_u8 v_uncompressed = {0};

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_id_part2[0];
  if (coro_susp_point) {
    v_block_size = self->private_data.s_decode_id_part2[0].v_block_size;
    v_need_block_size = self->private_data.s_decode_id_part2[0].v_need_block_size;
    v_lzw_status = self->private_data.s_decode_id_part2[0].v_lzw_status;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    v_need_block_size = true;
    label__outer__continue:;
    while (true) {
      if (v_need_block_size) {
        v_need_block_size = false;
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t t_0 = *iop_a_src++;
          v_block_size = t_0;
        }
      }
      if (v_block_size == 0) {
        goto label__outer__break;
      }
      while (((uint64_t)(io2_a_src - iop_a_src)) == 0) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
      }
      if (self->private_impl.f_compressed_ri == self->private_impl.f_compressed_wi) {
        self->private_impl.f_compressed_ri = 0;
        self->private_impl.f_compressed_wi = 0;
      }
      while (self->private_impl.f_compressed_wi <= 3841) {
        v_n_compressed = wuffs_base__u64__min(v_block_size, ((uint64_t)(io2_a_src - iop_a_src)));
        if (v_n_compressed <= 0) {
          goto label__0__break;
        }
        v_n_copied = wuffs_base__io_reader__limited_copy_u32_to_slice(
            &iop_a_src, io2_a_src,((uint32_t)((v_n_compressed & 4294967295))), wuffs_base__slice_u8__subslice_i(wuffs_base__make_slice_u8(self->private_data.f_compressed, 4096), self->private_impl.f_compressed_wi));
        wuffs_base__u64__sat_add_indirect(&self->private_impl.f_compressed_wi, ((uint64_t)(v_n_copied)));
        wuffs_base__u64__sat_sub_indirect(&v_block_size, ((uint64_t)(v_n_copied)));
        if (v_block_size > 0) {
          goto label__0__break;
        }
        if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
          v_need_block_size = true;
          goto label__0__break;
        }
        v_block_size = ((uint64_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src)));
        iop_a_src += 1;
      }
      label__0__break:;
      label__inner__continue:;
      while (true) {
        if ((self->private_impl.f_compressed_ri > self->private_impl.f_compressed_wi) || (self->private_impl.f_compressed_wi > 4096)) {
          status = wuffs_base__make_status(wuffs_gif__error__internal_error_inconsistent_ri_wi);
          goto exit;
        }
        {
          wuffs_base__io_buffer* o_0_v_r = v_r;
          const uint8_t *o_0_iop_v_r = iop_v_r;
          const uint8_t *o_0_io0_v_r = io0_v_r;
          const uint8_t *o_0_io1_v_r = io1_v_r;
          const uint8_t *o_0_io2_v_r = io2_v_r;
          v_r = wuffs_base__io_reader__set(
              &u_r,
              &iop_v_r,
              &io0_v_r,
              &io1_v_r,
              &io2_v_r,
              wuffs_base__slice_u8__subslice_ij(wuffs_base__make_slice_u8(self->private_data.f_compressed,
              4096),
              self->private_impl.f_compressed_ri,
              self->private_impl.f_compressed_wi));
          v_mark = ((uint64_t)(iop_v_r - io0_v_r));
          {
            u_r.meta.ri = ((size_t)(iop_v_r - u_r.data.ptr));
            wuffs_base__status t_1 = wuffs_lzw__decoder__transform_io(&self->private_data.f_lzw, &empty_io_buffer, v_r, wuffs_base__utility__empty_slice_u8());
            v_lzw_status = t_1;
            iop_v_r = u_r.data.ptr + u_r.meta.ri;
          }
          wuffs_base__u64__sat_add_indirect(&self->private_impl.f_compressed_ri, wuffs_base__io__count_since(v_mark, ((uint64_t)(iop_v_r - io0_v_r))));
          v_r = o_0_v_r;
          iop_v_r = o_0_iop_v_r;
          io0_v_r = o_0_io0_v_r;
          io1_v_r = o_0_io1_v_r;
          io2_v_r = o_0_io2_v_r;
        }
        v_uncompressed = wuffs_lzw__decoder__flush(&self->private_data.f_lzw);
        if (((uint64_t)(v_uncompressed.len)) > 0) {
          v_copy_status = wuffs_gif__decoder__copy_to_image_buffer(self, a_dst, v_uncompressed);
          if (wuffs_base__status__is_error(&v_copy_status)) {
            status = v_copy_status;
            goto exit;
          }
        }
        if (wuffs_base__status__is_ok(&v_lzw_status)) {
          self->private_impl.f_previous_lzw_decode_ended_abruptly = false;
          if (v_need_block_size || (v_block_size > 0)) {
            self->private_data.s_decode_id_part2[0].scratch = ((uint32_t)(v_block_size));
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
            if (self->private_data.s_decode_id_part2[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
              self->private_data.s_decode_id_part2[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
              iop_a_src = io2_a_src;
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            iop_a_src += self->private_data.s_decode_id_part2[0].scratch;
            if (a_src) {
              a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
            }
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
            status = wuffs_gif__decoder__skip_blocks(self, a_src);
            if (a_src) {
              iop_a_src = a_src->data.ptr + a_src->meta.ri;
            }
            if (status.repr) {
              goto suspend;
            }
          }
          goto label__outer__break;
        } else if (v_lzw_status.repr == wuffs_base__suspension__short_read) {
          goto label__outer__continue;
        } else if (v_lzw_status.repr == wuffs_base__suspension__short_write) {
          goto label__inner__continue;
        }
        status = v_lzw_status;
        if (wuffs_base__status__is_error(&status)) {
          goto exit;
        } else if (wuffs_base__status__is_suspension(&status)) {
          status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
          goto exit;
        }
        goto ok;
      }
    }
    label__outer__break:;
    self->private_impl.f_compressed_ri = 0;
    self->private_impl.f_compressed_wi = 0;
    if ((self->private_impl.f_dst_y < self->private_impl.f_frame_rect_y1) && (self->private_impl.f_frame_rect_x0 != self->private_impl.f_frame_rect_x1) && (self->private_impl.f_frame_rect_y0 != self->private_impl.f_frame_rect_y1)) {
      status = wuffs_base__make_status(wuffs_base__error__not_enough_data);
      goto exit;
    }

    goto ok;
    ok:
    self->private_impl.p_decode_id_part2[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_id_part2[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_data.s_decode_id_part2[0].v_block_size = v_block_size;
  self->private_data.s_decode_id_part2[0].v_need_block_size = v_need_block_size;
  self->private_data.s_decode_id_part2[0].v_lzw_status = v_lzw_status;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func gif.decoder.copy_to_image_buffer

static wuffs_base__status
wuffs_gif__decoder__copy_to_image_buffer(
    wuffs_gif__decoder* self,
    wuffs_base__pixel_buffer* a_pb,
    wuffs_base__slice_u8 a_src) {
  wuffs_base__slice_u8 v_dst = {0};
  wuffs_base__slice_u8 v_src = {0};
  uint64_t v_width_in_bytes = 0;
  uint64_t v_n = 0;
  uint64_t v_src_ri = 0;
  wuffs_base__pixel_format v_pixfmt = {0};
  uint32_t v_bytes_per_pixel = 0;
  uint32_t v_bits_per_pixel = 0;
  wuffs_base__table_u8 v_tab = {0};
  uint64_t v_i = 0;
  uint64_t v_j = 0;
  uint32_t v_replicate_y0 = 0;
  uint32_t v_replicate_y1 = 0;
  wuffs_base__slice_u8 v_replicate_dst = {0};
  wuffs_base__slice_u8 v_replicate_src = {0};

  v_pixfmt = wuffs_base__pixel_buffer__pixel_format(a_pb);
  v_bits_per_pixel = wuffs_base__pixel_format__bits_per_pixel(&v_pixfmt);
  if ((v_bits_per_pixel & 7) != 0) {
    return wuffs_base__make_status(wuffs_base__error__unsupported_option);
  }
  v_bytes_per_pixel = (v_bits_per_pixel >> 3);
  v_width_in_bytes = (((uint64_t)(self->private_impl.f_width)) * ((uint64_t)(v_bytes_per_pixel)));
  v_tab = wuffs_base__pixel_buffer__plane(a_pb, 0);
  label__0__continue:;
  while (v_src_ri < ((uint64_t)(a_src.len))) {
    v_src = wuffs_base__slice_u8__subslice_i(a_src, v_src_ri);
    if (self->private_impl.f_dst_y >= self->private_impl.f_frame_rect_y1) {
      if (self->private_impl.f_quirks[3]) {
        return wuffs_base__make_status(NULL);
      }
      return wuffs_base__make_status(wuffs_base__error__too_much_data);
    }
    v_dst = wuffs_base__table_u8__row(v_tab, self->private_impl.f_dst_y);
    if (self->private_impl.f_dst_y >= self->private_impl.f_height) {
      v_dst = wuffs_base__slice_u8__subslice_j(v_dst, 0);
    } else if (v_width_in_bytes < ((uint64_t)(v_dst.len))) {
      v_dst = wuffs_base__slice_u8__subslice_j(v_dst, v_width_in_bytes);
    }
    v_i = (((uint64_t)(self->private_impl.f_dst_x)) * ((uint64_t)(v_bytes_per_pixel)));
    if (v_i < ((uint64_t)(v_dst.len))) {
      v_j = (((uint64_t)(self->private_impl.f_frame_rect_x1)) * ((uint64_t)(v_bytes_per_pixel)));
      if ((v_i <= v_j) && (v_j <= ((uint64_t)(v_dst.len)))) {
        v_dst = wuffs_base__slice_u8__subslice_ij(v_dst, v_i, v_j);
      } else {
        v_dst = wuffs_base__slice_u8__subslice_i(v_dst, v_i);
      }
      v_n = wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, v_dst, wuffs_base__make_slice_u8(self->private_data.f_dst_palette, 1024), v_src);
      wuffs_base__u64__sat_add_indirect(&v_src_ri, v_n);
      wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x, ((uint32_t)((v_n & 4294967295))));
      self->private_impl.f_dirty_max_excl_y = wuffs_base__u32__max(self->private_impl.f_dirty_max_excl_y, wuffs_base__u32__sat_add(self->private_impl.f_dst_y, 1));
    }
    if (self->private_impl.f_frame_rect_x1 <= self->private_impl.f_dst_x) {
      self->private_impl.f_dst_x = self->private_impl.f_frame_rect_x0;
      if (self->private_impl.f_interlace == 0) {
        wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_y, 1);
        goto label__0__continue;
      }
      if ((self->private_impl.f_num_decoded_frames_value == 0) &&  ! self->private_impl.f_gc_has_transparent_index && (self->private_impl.f_interlace > 1)) {
        v_replicate_src = wuffs_base__table_u8__row(v_tab, self->private_impl.f_dst_y);
        v_replicate_y0 = wuffs_base__u32__sat_add(self->private_impl.f_dst_y, 1);
        v_replicate_y1 = wuffs_base__u32__sat_add(self->private_impl.f_dst_y, ((uint32_t)(WUFFS_GIF__INTERLACE_COUNT[self->private_impl.f_interlace])));
        v_replicate_y1 = wuffs_base__u32__min(v_replicate_y1, self->private_impl.f_frame_rect_y1);
        while (v_replicate_y0 < v_replicate_y1) {
          v_replicate_dst = wuffs_base__table_u8__row(v_tab, v_replicate_y0);
          wuffs_base__slice_u8__copy_from_slice(v_replicate_dst, v_replicate_src);
          v_replicate_y0 += 1;
        }
        self->private_impl.f_dirty_max_excl_y = wuffs_base__u32__max(self->private_impl.f_dirty_max_excl_y, v_replicate_y1);
      }
      wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_y, ((uint32_t)(WUFFS_GIF__INTERLACE_DELTA[self->private_impl.f_interlace])));
      while ((self->private_impl.f_interlace > 0) && (self->private_impl.f_dst_y >= self->private_impl.f_frame_rect_y1)) {
#if defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wconversion"
#endif
        self->private_impl.f_interlace -= 1;
#if defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
        self->private_impl.f_dst_y = wuffs_base__u32__sat_add(self->private_impl.f_frame_rect_y0, WUFFS_GIF__INTERLACE_START[self->private_impl.f_interlace]);
      }
      goto label__0__continue;
    }
    if (((uint64_t)(a_src.len)) == v_src_ri) {
      goto label__0__break;
    } else if (((uint64_t)(a_src.len)) < v_src_ri) {
      return wuffs_base__make_status(wuffs_gif__error__internal_error_inconsistent_ri_wi);
    }
    v_n = ((uint64_t)((self->private_impl.f_frame_rect_x1 - self->private_impl.f_dst_x)));
    v_n = wuffs_base__u64__min(v_n, (((uint64_t)(a_src.len)) - v_src_ri));
    wuffs_base__u64__sat_add_indirect(&v_src_ri, v_n);
    wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x, ((uint32_t)((v_n & 4294967295))));
    if (self->private_impl.f_frame_rect_x1 <= self->private_impl.f_dst_x) {
      self->private_impl.f_dst_x = self->private_impl.f_frame_rect_x0;
      wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_y, ((uint32_t)(WUFFS_GIF__INTERLACE_DELTA[self->private_impl.f_interlace])));
      while ((self->private_impl.f_interlace > 0) && (self->private_impl.f_dst_y >= self->private_impl.f_frame_rect_y1)) {
#if defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wconversion"
#endif
        self->private_impl.f_interlace -= 1;
#if defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
        self->private_impl.f_dst_y = wuffs_base__u32__sat_add(self->private_impl.f_frame_rect_y0, WUFFS_GIF__INTERLACE_START[self->private_impl.f_interlace]);
      }
      goto label__0__continue;
    }
    if (v_src_ri != ((uint64_t)(a_src.len))) {
      return wuffs_base__make_status(wuffs_gif__error__internal_error_inconsistent_ri_wi);
    }
    goto label__0__break;
  }
  label__0__break:;
  return wuffs_base__make_status(NULL);
}

#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__GIF)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__GZIP)

// ---------------- Status Codes Implementations

const char wuffs_gzip__error__bad_checksum[] = "#gzip: bad checksum";
const char wuffs_gzip__error__bad_compression_method[] = "#gzip: bad compression method";
const char wuffs_gzip__error__bad_encoding_flags[] = "#gzip: bad encoding flags";
const char wuffs_gzip__error__bad_header[] = "#gzip: bad header";

// ---------------- Private Consts

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

// ---------------- VTables

const wuffs_base__io_transformer__func_ptrs
wuffs_gzip__decoder__func_ptrs_for__wuffs_base__io_transformer = {
  (wuffs_base__empty_struct(*)(void*,
      uint32_t,
      bool))(&wuffs_gzip__decoder__set_quirk_enabled),
  (wuffs_base__status(*)(void*,
      wuffs_base__io_buffer*,
      wuffs_base__io_buffer*,
      wuffs_base__slice_u8))(&wuffs_gzip__decoder__transform_io),
  (wuffs_base__range_ii_u64(*)(const void*))(&wuffs_gzip__decoder__workbuf_len),
};

// ---------------- Initializer Implementations

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_gzip__decoder__initialize(
    wuffs_gzip__decoder* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options){
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (sizeof(*self) != sizeof_star_self) {
    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
  }
  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
  }

  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
    // The whole point of this if-check is to detect an uninitialized *self.
    // We disable the warning on GCC. Clang-5.0 does not have this warning.
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
    if (self->private_impl.magic != 0) {
      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
    }
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
  } else {
    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    } else {
      memset(&(self->private_impl), 0, sizeof(self->private_impl));
    }
  }

  {
    wuffs_base__status z = wuffs_crc32__ieee_hasher__initialize(
        &self->private_data.f_checksum, sizeof(self->private_data.f_checksum), WUFFS_VERSION, options);
    if (z.repr) {
      return z;
    }
  }
  {
    wuffs_base__status z = wuffs_deflate__decoder__initialize(
        &self->private_data.f_flate, sizeof(self->private_data.f_flate), WUFFS_VERSION, options);
    if (z.repr) {
      return z;
    }
  }
  self->private_impl.magic = WUFFS_BASE__MAGIC;
  self->private_impl.vtable_for__wuffs_base__io_transformer.vtable_name =
      wuffs_base__io_transformer__vtable_name;
  self->private_impl.vtable_for__wuffs_base__io_transformer.function_pointers =
      (const void*)(&wuffs_gzip__decoder__func_ptrs_for__wuffs_base__io_transformer);
  return wuffs_base__make_status(NULL);
}

wuffs_gzip__decoder*
wuffs_gzip__decoder__alloc() {
  wuffs_gzip__decoder* x =
      (wuffs_gzip__decoder*)(calloc(sizeof(wuffs_gzip__decoder), 1));
  if (!x) {
    return NULL;
  }
  if (wuffs_gzip__decoder__initialize(
      x, sizeof(wuffs_gzip__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
    free(x);
    return NULL;
  }
  return x;
}

size_t
sizeof__wuffs_gzip__decoder() {
  return sizeof(wuffs_gzip__decoder);
}

// ---------------- Function Implementations

// -------- func gzip.decoder.set_quirk_enabled

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_gzip__decoder__set_quirk_enabled(
    wuffs_gzip__decoder* self,
    uint32_t a_quirk,
    bool a_enabled) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }

  if (a_quirk == 1) {
    self->private_impl.f_ignore_checksum = a_enabled;
  }
  return wuffs_base__make_empty_struct();
}

// -------- func gzip.decoder.workbuf_len

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_gzip__decoder__workbuf_len(
    const wuffs_gzip__decoder* self) {
  if (!self) {
    return wuffs_base__utility__empty_range_ii_u64();
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__empty_range_ii_u64();
  }

  return wuffs_base__utility__make_range_ii_u64(1, 1);
}

// -------- func gzip.decoder.transform_io

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_gzip__decoder__transform_io(
    wuffs_gzip__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__slice_u8 a_workbuf) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_dst || !a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 1)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint8_t v_c = 0;
  uint8_t v_flags = 0;
  uint16_t v_xlen = 0;
  uint64_t v_mark = 0;
  uint32_t v_checksum_got = 0;
  uint32_t v_decoded_length_got = 0;
  wuffs_base__status v_status = wuffs_base__make_status(NULL);
  uint32_t v_checksum_want = 0;
  uint32_t v_decoded_length_want = 0;

  uint8_t* iop_a_dst = NULL;
  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_dst) {
    io0_a_dst = a_dst->data.ptr;
    io1_a_dst = io0_a_dst + a_dst->meta.wi;
    iop_a_dst = io1_a_dst;
    io2_a_dst = io0_a_dst + a_dst->data.len;
    if (a_dst->meta.closed) {
      io2_a_dst = iop_a_dst;
    }
  }
  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_transform_io[0];
  if (coro_susp_point) {
    v_flags = self->private_data.s_transform_io[0].v_flags;
    v_checksum_got = self->private_data.s_transform_io[0].v_checksum_got;
    v_decoded_length_got = self->private_data.s_transform_io[0].v_decoded_length_got;
    v_checksum_want = self->private_data.s_transform_io[0].v_checksum_want;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      uint8_t t_0 = *iop_a_src++;
      v_c = t_0;
    }
    if (v_c != 31) {
      status = wuffs_base__make_status(wuffs_gzip__error__bad_header);
      goto exit;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      uint8_t t_1 = *iop_a_src++;
      v_c = t_1;
    }
    if (v_c != 139) {
      status = wuffs_base__make_status(wuffs_gzip__error__bad_header);
      goto exit;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      uint8_t t_2 = *iop_a_src++;
      v_c = t_2;
    }
    if (v_c != 8) {
      status = wuffs_base__make_status(wuffs_gzip__error__bad_compression_method);
      goto exit;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      uint8_t t_3 = *iop_a_src++;
      v_flags = t_3;
    }
    self->private_data.s_transform_io[0].scratch = 6;
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
    if (self->private_data.s_transform_io[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
      self->private_data.s_transform_io[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
      iop_a_src = io2_a_src;
      status = wuffs_base__make_status(wuffs_base__suspension__short_read);
      goto suspend;
    }
    iop_a_src += self->private_data.s_transform_io[0].scratch;
    if ((v_flags & 4) != 0) {
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
        uint16_t t_4;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
          t_4 = wuffs_base__peek_u16le__no_bounds_check(iop_a_src);
          iop_a_src += 2;
        } else {
          self->private_data.s_transform_io[0].scratch = 0;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
          while (true) {
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint64_t* scratch = &self->private_data.s_transform_io[0].scratch;
            uint32_t num_bits_4 = ((uint32_t)(*scratch >> 56));
            *scratch <<= 8;
            *scratch >>= 8;
            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_4;
            if (num_bits_4 == 8) {
              t_4 = ((uint16_t)(*scratch));
              break;
            }
            num_bits_4 += 8;
            *scratch |= ((uint64_t)(num_bits_4)) << 56;
          }
        }
        v_xlen = t_4;
      }
      self->private_data.s_transform_io[0].scratch = ((uint32_t)(v_xlen));
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
      if (self->private_data.s_transform_io[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
        self->private_data.s_transform_io[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
        iop_a_src = io2_a_src;
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      iop_a_src += self->private_data.s_transform_io[0].scratch;
    }
    if ((v_flags & 8) != 0) {
      while (true) {
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(9);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint8_t t_5 = *iop_a_src++;
          v_c = t_5;
        }
        if (v_c == 0) {
          goto label__0__break;
        }
      }
      label__0__break:;
    }
    if ((v_flags & 16) != 0) {
      while (true) {
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(10);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint8_t t_6 = *iop_a_src++;
          v_c = t_6;
        }
        if (v_c == 0) {
          goto label__1__break;
        }
      }
      label__1__break:;
    }
    if ((v_flags & 2) != 0) {
      self->private_data.s_transform_io[0].scratch = 2;
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(11);
      if (self->private_data.s_transform_io[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
        self->private_data.s_transform_io[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
        iop_a_src = io2_a_src;
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      iop_a_src += self->private_data.s_transform_io[0].scratch;
    }
    if ((v_flags & 224) != 0) {
      status = wuffs_base__make_status(wuffs_gzip__error__bad_encoding_flags);
      goto exit;
    }
    while (true) {
      v_mark = ((uint64_t)(iop_a_dst - io0_a_dst));
      {
        if (a_dst) {
          a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
        }
        if (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        wuffs_base__status t_7 = wuffs_deflate__decoder__transform_io(&self->private_data.f_flate, a_dst, a_src, a_workbuf);
        v_status = t_7;
        if (a_dst) {
          iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
        }
        if (a_src) {
          iop_a_src = a_src->data.ptr + a_src->meta.ri;
        }
      }
      if ( ! self->private_impl.f_ignore_checksum) {
        v_checksum_got = wuffs_crc32__ieee_hasher__update_u32(&self->private_data.f_checksum, wuffs_base__io__since(v_mark, ((uint64_t)(iop_a_dst - io0_a_dst)), io0_a_dst));
        v_decoded_length_got += ((uint32_t)((wuffs_base__io__count_since(v_mark, ((uint64_t)(iop_a_dst - io0_a_dst))) & 4294967295)));
      }
      if (wuffs_base__status__is_ok(&v_status)) {
        goto label__2__break;
      }
      status = v_status;
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(12);
    }
    label__2__break:;
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(13);
      uint32_t t_8;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
        t_8 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
        iop_a_src += 4;
      } else {
        self->private_data.s_transform_io[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(14);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_transform_io[0].scratch;
          uint32_t num_bits_8 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_8;
          if (num_bits_8 == 24) {
            t_8 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_8 += 8;
          *scratch |= ((uint64_t)(num_bits_8)) << 56;
        }
      }
      v_checksum_want = t_8;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(15);
      uint32_t t_9;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
        t_9 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
        iop_a_src += 4;
      } else {
        self->private_data.s_transform_io[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(16);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_transform_io[0].scratch;
          uint32_t num_bits_9 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_9;
          if (num_bits_9 == 24) {
            t_9 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_9 += 8;
          *scratch |= ((uint64_t)(num_bits_9)) << 56;
        }
      }
      v_decoded_length_want = t_9;
    }
    if ( ! self->private_impl.f_ignore_checksum && ((v_checksum_got != v_checksum_want) || (v_decoded_length_got != v_decoded_length_want))) {
      status = wuffs_base__make_status(wuffs_gzip__error__bad_checksum);
      goto exit;
    }

    goto ok;
    ok:
    self->private_impl.p_transform_io[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_transform_io[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 1 : 0;
  self->private_data.s_transform_io[0].v_flags = v_flags;
  self->private_data.s_transform_io[0].v_checksum_got = v_checksum_got;
  self->private_data.s_transform_io[0].v_decoded_length_got = v_decoded_length_got;
  self->private_data.s_transform_io[0].v_checksum_want = v_checksum_want;

  goto exit;
  exit:
  if (a_dst) {
    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
  }
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__GZIP)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__JSON)

// ---------------- Status Codes Implementations

const char wuffs_json__error__bad_c0_control_code[] = "#json: bad C0 control code";
const char wuffs_json__error__bad_utf_8[] = "#json: bad UTF-8";
const char wuffs_json__error__bad_backslash_escape[] = "#json: bad backslash-escape";
const char wuffs_json__error__bad_input[] = "#json: bad input";
const char wuffs_json__error__bad_new_line_in_a_string[] = "#json: bad new-line in a string";
const char wuffs_json__error__bad_quirk_combination[] = "#json: bad quirk combination";
const char wuffs_json__error__unsupported_number_length[] = "#json: unsupported number length";
const char wuffs_json__error__unsupported_recursion_depth[] = "#json: unsupported recursion depth";
const char wuffs_json__error__internal_error_inconsistent_i_o[] = "#json: internal error: inconsistent I/O";

// ---------------- Private Consts

#define WUFFS_JSON__DECODER_NUMBER_LENGTH_MAX_INCL 99

static const uint8_t
WUFFS_JSON__LUT_BACKSLASHES[256] WUFFS_BASE__POTENTIALLY_UNUSED = {
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 3, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 162, 0, 0, 0, 0, 5,
  0, 0, 0, 0, 0, 0, 0, 175,
  7, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 4,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 220, 0, 0, 0,
  0, 1, 136, 0, 0, 2, 140, 0,
  0, 0, 0, 0, 0, 0, 138, 0,
  0, 0, 141, 0, 137, 0, 6, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
};

static const uint8_t
WUFFS_JSON__LUT_QUIRKY_BACKSLASHES_QUIRKS[8] WUFFS_BASE__POTENTIALLY_UNUSED = {
  0, 1, 3, 4, 5, 6, 7, 10,
};

static const uint8_t
WUFFS_JSON__LUT_QUIRKY_BACKSLASHES_CHARS[8] WUFFS_BASE__POTENTIALLY_UNUSED = {
  0, 7, 27, 10, 63, 39, 11, 0,
};

static const uint8_t
WUFFS_JSON__LUT_CHARS[256] WUFFS_BASE__POTENTIALLY_UNUSED = {
  128, 129, 130, 131, 132, 133, 134, 135,
  136, 137, 138, 139, 140, 141, 142, 143,
  144, 145, 146, 147, 148, 149, 150, 151,
  152, 153, 154, 155, 156, 157, 158, 159,
  0, 0, 1, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 2, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  16, 16, 16, 16, 16, 16, 16, 16,
  16, 16, 16, 16, 16, 16, 16, 16,
  16, 16, 16, 16, 16, 16, 16, 16,
  16, 16, 16, 16, 16, 16, 16, 16,
  16, 16, 16, 16, 16, 16, 16, 16,
  16, 16, 16, 16, 16, 16, 16, 16,
  16, 16, 16, 16, 16, 16, 16, 16,
  16, 16, 16, 16, 16, 16, 16, 16,
  32, 32, 3, 3, 3, 3, 3, 3,
  3, 3, 3, 3, 3, 3, 3, 3,
  3, 3, 3, 3, 3, 3, 3, 3,
  3, 3, 3, 3, 3, 3, 3, 3,
  4, 4, 4, 4, 4, 4, 4, 4,
  4, 4, 4, 4, 4, 4, 4, 4,
  5, 5, 5, 5, 5, 32, 32, 32,
  32, 32, 32, 32, 32, 32, 32, 32,
};

#define WUFFS_JSON__CLASS_WHITESPACE 0

#define WUFFS_JSON__CLASS_STRING 1

#define WUFFS_JSON__CLASS_COMMA 2

#define WUFFS_JSON__CLASS_COLON 3

#define WUFFS_JSON__CLASS_NUMBER 4

#define WUFFS_JSON__CLASS_OPEN_CURLY_BRACE 5

#define WUFFS_JSON__CLASS_CLOSE_CURLY_BRACE 6

#define WUFFS_JSON__CLASS_OPEN_SQUARE_BRACKET 7

#define WUFFS_JSON__CLASS_CLOSE_SQUARE_BRACKET 8

#define WUFFS_JSON__CLASS_FALSE 9

#define WUFFS_JSON__CLASS_TRUE 10

#define WUFFS_JSON__CLASS_NULL_NAN_INF 11

#define WUFFS_JSON__CLASS_COMMENT 12

#define WUFFS_JSON__EXPECT_VALUE 7858

#define WUFFS_JSON__EXPECT_NON_STRING_VALUE 7856

#define WUFFS_JSON__EXPECT_STRING 4098

#define WUFFS_JSON__EXPECT_COMMA 4100

#define WUFFS_JSON__EXPECT_COLON 4104

#define WUFFS_JSON__EXPECT_NUMBER 4112

#define WUFFS_JSON__EXPECT_CLOSE_CURLY_BRACE 4160

#define WUFFS_JSON__EXPECT_CLOSE_SQUARE_BRACKET 4352

static const uint8_t
WUFFS_JSON__LUT_CLASSES[256] WUFFS_BASE__POTENTIALLY_UNUSED = {
  15, 15, 15, 15, 15, 15, 15, 15,
  15, 0, 0, 15, 15, 0, 15, 15,
  15, 15, 15, 15, 15, 15, 15, 15,
  15, 15, 15, 15, 15, 15, 15, 15,
  0, 15, 1, 15, 15, 15, 15, 15,
  15, 15, 15, 11, 2, 4, 15, 12,
  4, 4, 4, 4, 4, 4, 4, 4,
  4, 4, 3, 15, 15, 15, 15, 15,
  15, 15, 15, 15, 15, 15, 15, 15,
  15, 11, 15, 15, 15, 15, 11, 15,
  15, 15, 15, 15, 15, 15, 15, 15,
  15, 15, 15, 7, 15, 8, 15, 15,
  15, 15, 15, 15, 15, 15, 9, 15,
  15, 11, 15, 15, 15, 15, 11, 15,
  15, 15, 15, 15, 10, 15, 15, 15,
  15, 15, 15, 5, 15, 6, 15, 15,
  15, 15, 15, 15, 15, 15, 15, 15,
  15, 15, 15, 15, 15, 15, 15, 15,
  15, 15, 15, 15, 15, 15, 15, 15,
  15, 15, 15, 15, 15, 15, 15, 15,
  15, 15, 15, 15, 15, 15, 15, 15,
  15, 15, 15, 15, 15, 15, 15, 15,
  15, 15, 15, 15, 15, 15, 15, 15,
  15, 15, 15, 15, 15, 15, 15, 15,
  15, 15, 15, 15, 15, 15, 15, 15,
  15, 15, 15, 15, 15, 15, 15, 15,
  15, 15, 15, 15, 15, 15, 15, 15,
  15, 15, 15, 15, 15, 15, 15, 15,
  15, 15, 15, 15, 15, 15, 15, 15,
  15, 15, 15, 15, 15, 15, 15, 15,
  15, 15, 15, 15, 15, 15, 15, 15,
  15, 15, 15, 15, 15, 15, 15, 15,
};

static const uint8_t
WUFFS_JSON__LUT_DECIMAL_DIGITS[256] WUFFS_BASE__POTENTIALLY_UNUSED = {
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  128, 129, 130, 131, 132, 133, 134, 135,
  136, 137, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
};

static const uint8_t
WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[256] WUFFS_BASE__POTENTIALLY_UNUSED = {
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  128, 129, 130, 131, 132, 133, 134, 135,
  136, 137, 0, 0, 0, 0, 0, 0,
  0, 138, 139, 140, 141, 142, 143, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 138, 139, 140, 141, 142, 143, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0,
};

#define WUFFS_JSON__QUIRKS_BASE 1225364480

#define WUFFS_JSON__QUIRKS_COUNT 21

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

static uint32_t
wuffs_json__decoder__decode_number(
    wuffs_json__decoder* self,
    wuffs_base__io_buffer* a_src);

static uint32_t
wuffs_json__decoder__decode_digits(
    wuffs_json__decoder* self,
    wuffs_base__io_buffer* a_src,
    uint32_t a_n);

static wuffs_base__status
wuffs_json__decoder__decode_leading(
    wuffs_json__decoder* self,
    wuffs_base__token_buffer* a_dst,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_json__decoder__decode_comment(
    wuffs_json__decoder* self,
    wuffs_base__token_buffer* a_dst,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_json__decoder__decode_inf_nan(
    wuffs_json__decoder* self,
    wuffs_base__token_buffer* a_dst,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_json__decoder__decode_trailer(
    wuffs_json__decoder* self,
    wuffs_base__token_buffer* a_dst,
    wuffs_base__io_buffer* a_src);

// ---------------- VTables

const wuffs_base__token_decoder__func_ptrs
wuffs_json__decoder__func_ptrs_for__wuffs_base__token_decoder = {
  (wuffs_base__status(*)(void*,
      wuffs_base__token_buffer*,
      wuffs_base__io_buffer*,
      wuffs_base__slice_u8))(&wuffs_json__decoder__decode_tokens),
  (wuffs_base__empty_struct(*)(void*,
      uint32_t,
      bool))(&wuffs_json__decoder__set_quirk_enabled),
  (wuffs_base__range_ii_u64(*)(const void*))(&wuffs_json__decoder__workbuf_len),
};

// ---------------- Initializer Implementations

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_json__decoder__initialize(
    wuffs_json__decoder* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options){
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (sizeof(*self) != sizeof_star_self) {
    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
  }
  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
  }

  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
    // The whole point of this if-check is to detect an uninitialized *self.
    // We disable the warning on GCC. Clang-5.0 does not have this warning.
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
    if (self->private_impl.magic != 0) {
      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
    }
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
  } else {
    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    } else {
      memset(&(self->private_impl), 0, sizeof(self->private_impl));
    }
  }

  self->private_impl.magic = WUFFS_BASE__MAGIC;
  self->private_impl.vtable_for__wuffs_base__token_decoder.vtable_name =
      wuffs_base__token_decoder__vtable_name;
  self->private_impl.vtable_for__wuffs_base__token_decoder.function_pointers =
      (const void*)(&wuffs_json__decoder__func_ptrs_for__wuffs_base__token_decoder);
  return wuffs_base__make_status(NULL);
}

wuffs_json__decoder*
wuffs_json__decoder__alloc() {
  wuffs_json__decoder* x =
      (wuffs_json__decoder*)(calloc(sizeof(wuffs_json__decoder), 1));
  if (!x) {
    return NULL;
  }
  if (wuffs_json__decoder__initialize(
      x, sizeof(wuffs_json__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
    free(x);
    return NULL;
  }
  return x;
}

size_t
sizeof__wuffs_json__decoder() {
  return sizeof(wuffs_json__decoder);
}

// ---------------- Function Implementations

// -------- func json.decoder.set_quirk_enabled

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_json__decoder__set_quirk_enabled(
    wuffs_json__decoder* self,
    uint32_t a_quirk,
    bool a_enabled) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }

  if (a_quirk >= 1225364480) {
    a_quirk -= 1225364480;
    if (a_quirk < 21) {
      self->private_impl.f_quirks[a_quirk] = a_enabled;
    }
  }
  return wuffs_base__make_empty_struct();
}

// -------- func json.decoder.workbuf_len

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_json__decoder__workbuf_len(
    const wuffs_json__decoder* self) {
  if (!self) {
    return wuffs_base__utility__empty_range_ii_u64();
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__empty_range_ii_u64();
  }

  return wuffs_base__utility__empty_range_ii_u64();
}

// -------- func json.decoder.decode_tokens

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_json__decoder__decode_tokens(
    wuffs_json__decoder* self,
    wuffs_base__token_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__slice_u8 a_workbuf) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_dst || !a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 1)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint32_t v_vminor = 0;
  uint32_t v_number_length = 0;
  uint32_t v_number_status = 0;
  uint32_t v_string_length = 0;
  uint32_t v_whitespace_length = 0;
  uint32_t v_depth = 0;
  uint32_t v_stack_byte = 0;
  uint32_t v_stack_bit = 0;
  uint32_t v_match = 0;
  uint32_t v_c4 = 0;
  uint8_t v_c = 0;
  uint8_t v_backslash = 0;
  uint8_t v_char = 0;
  uint8_t v_class = 0;
  uint32_t v_multi_byte_utf8 = 0;
  uint8_t v_backslash_x_ok = 0;
  uint8_t v_backslash_x_value = 0;
  uint32_t v_backslash_x_string = 0;
  uint8_t v_uni4_ok = 0;
  uint64_t v_uni4_string = 0;
  uint32_t v_uni4_value = 0;
  uint32_t v_uni4_high_surrogate = 0;
  uint8_t v_uni8_ok = 0;
  uint64_t v_uni8_string = 0;
  uint32_t v_uni8_value = 0;
  uint32_t v_expect = 0;
  uint32_t v_expect_after_value = 0;

  wuffs_base__token* iop_a_dst = NULL;
  wuffs_base__token* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  wuffs_base__token* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  wuffs_base__token* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_dst) {
    io0_a_dst = a_dst->data.ptr;
    io1_a_dst = io0_a_dst + a_dst->meta.wi;
    iop_a_dst = io1_a_dst;
    io2_a_dst = io0_a_dst + a_dst->data.len;
    if (a_dst->meta.closed) {
      io2_a_dst = iop_a_dst;
    }
  }
  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_tokens[0];
  if (coro_susp_point) {
    v_depth = self->private_data.s_decode_tokens[0].v_depth;
    v_expect = self->private_data.s_decode_tokens[0].v_expect;
    v_expect_after_value = self->private_data.s_decode_tokens[0].v_expect_after_value;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_end_of_data) {
      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
      goto ok;
    }
    if (self->private_impl.f_quirks[18]) {
      if (self->private_impl.f_quirks[11] || self->private_impl.f_quirks[12] || self->private_impl.f_quirks[17]) {
        status = wuffs_base__make_status(wuffs_json__error__bad_quirk_combination);
        goto exit;
      }
    }
    if (self->private_impl.f_quirks[15] || self->private_impl.f_quirks[16]) {
      if (a_dst) {
        a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
      }
      if (a_src) {
        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
      }
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      status = wuffs_json__decoder__decode_leading(self, a_dst, a_src);
      if (a_dst) {
        iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
      }
      if (a_src) {
        iop_a_src = a_src->data.ptr + a_src->meta.ri;
      }
      if (status.repr) {
        goto suspend;
      }
    }
    v_expect = 7858;
    label__outer__continue:;
    while (true) {
      while (true) {
        if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
          status = wuffs_base__make_status(wuffs_base__suspension__short_write);
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
          goto label__outer__continue;
        }
        v_whitespace_length = 0;
        v_c = 0;
        v_class = 0;
        while (true) {
          if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
            if (v_whitespace_length > 0) {
              *iop_a_dst++ = wuffs_base__make_token(
                  (((uint64_t)(0)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                  (((uint64_t)(v_whitespace_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
              v_whitespace_length = 0;
            }
            if (a_src && a_src->meta.closed) {
              status = wuffs_base__make_status(wuffs_json__error__bad_input);
              goto exit;
            }
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(3);
            v_whitespace_length = 0;
            goto label__outer__continue;
          }
          v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
          v_class = WUFFS_JSON__LUT_CLASSES[v_c];
          if (v_class != 0) {
            goto label__ws__break;
          }
          iop_a_src += 1;
          if (v_whitespace_length >= 65534) {
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(0)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)(65535)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            v_whitespace_length = 0;
            goto label__outer__continue;
          }
          v_whitespace_length += 1;
        }
        label__ws__break:;
        if (v_whitespace_length > 0) {
          *iop_a_dst++ = wuffs_base__make_token(
              (((uint64_t)(0)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
              (((uint64_t)(v_whitespace_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
          v_whitespace_length = 0;
          if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
            goto label__outer__continue;
          }
        }
        if (0 == (v_expect & (((uint32_t)(1)) << v_class))) {
          status = wuffs_base__make_status(wuffs_json__error__bad_input);
          goto exit;
        }
        if (v_class == 1) {
          *iop_a_dst++ = wuffs_base__make_token(
              (((uint64_t)(4194579)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
              (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
              (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
          iop_a_src += 1;
          label__string_loop_outer__continue:;
          while (true) {
            if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_write);
              WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(4);
              goto label__string_loop_outer__continue;
            }
            v_string_length = 0;
            label__string_loop_inner__continue:;
            while (true) {
              if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
                if (v_string_length > 0) {
                  *iop_a_dst++ = wuffs_base__make_token(
                      (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                      (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                      (((uint64_t)(v_string_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                  v_string_length = 0;
                }
                if (a_src && a_src->meta.closed) {
                  status = wuffs_base__make_status(wuffs_json__error__bad_input);
                  goto exit;
                }
                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(5);
                v_string_length = 0;
                goto label__string_loop_outer__continue;
              }
              while (((uint64_t)(io2_a_src - iop_a_src)) > 4) {
                v_c4 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
                if (0 != (WUFFS_JSON__LUT_CHARS[(255 & (v_c4 >> 0))] |
                    WUFFS_JSON__LUT_CHARS[(255 & (v_c4 >> 8))] |
                    WUFFS_JSON__LUT_CHARS[(255 & (v_c4 >> 16))] |
                    WUFFS_JSON__LUT_CHARS[(255 & (v_c4 >> 24))])) {
                  goto label__0__break;
                }
                iop_a_src += 4;
                if (v_string_length > 65527) {
                  *iop_a_dst++ = wuffs_base__make_token(
                      (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                      (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                      (((uint64_t)((v_string_length + 4))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                  v_string_length = 0;
                  goto label__string_loop_outer__continue;
                }
                v_string_length += 4;
              }
              label__0__break:;
              v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
              v_char = WUFFS_JSON__LUT_CHARS[v_c];
              if (v_char == 0) {
                iop_a_src += 1;
                if (v_string_length >= 65531) {
                  *iop_a_dst++ = wuffs_base__make_token(
                      (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                      (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                      (((uint64_t)(65532)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                  v_string_length = 0;
                  goto label__string_loop_outer__continue;
                }
                v_string_length += 1;
                goto label__string_loop_inner__continue;
              } else if (v_char == 1) {
                if (v_string_length != 0) {
                  *iop_a_dst++ = wuffs_base__make_token(
                      (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                      (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                      (((uint64_t)(v_string_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                  v_string_length = 0;
                }
                goto label__string_loop_outer__break;
              } else if (v_char == 2) {
                if (v_string_length > 0) {
                  *iop_a_dst++ = wuffs_base__make_token(
                      (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                      (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                      (((uint64_t)(v_string_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                  v_string_length = 0;
                  if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
                    goto label__string_loop_outer__continue;
                  }
                }
                if (((uint64_t)(io2_a_src - iop_a_src)) < 2) {
                  if (a_src && a_src->meta.closed) {
                    status = wuffs_base__make_status(wuffs_json__error__bad_backslash_escape);
                    goto exit;
                  }
                  status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                  WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(6);
                  v_string_length = 0;
                  v_char = 0;
                  goto label__string_loop_outer__continue;
                }
                v_c = ((uint8_t)((wuffs_base__peek_u16le__no_bounds_check(iop_a_src) >> 8)));
                v_backslash = WUFFS_JSON__LUT_BACKSLASHES[v_c];
                if ((v_backslash & 128) != 0) {
                  iop_a_src += 2;
                  *iop_a_dst++ = wuffs_base__make_token(
                      (((uint64_t)((6291456 | ((uint32_t)((v_backslash & 127)))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                      (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                      (((uint64_t)(2)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                  goto label__string_loop_outer__continue;
                } else if (v_backslash != 0) {
                  if (self->private_impl.f_quirks[WUFFS_JSON__LUT_QUIRKY_BACKSLASHES_QUIRKS[(v_backslash & 7)]]) {
                    iop_a_src += 2;
                    *iop_a_dst++ = wuffs_base__make_token(
                        (((uint64_t)((6291456 | ((uint32_t)(WUFFS_JSON__LUT_QUIRKY_BACKSLASHES_CHARS[(v_backslash & 7)]))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                        (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                        (((uint64_t)(2)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                    goto label__string_loop_outer__continue;
                  }
                } else if (v_c == 117) {
                  if (((uint64_t)(io2_a_src - iop_a_src)) < 6) {
                    if (a_src && a_src->meta.closed) {
                      status = wuffs_base__make_status(wuffs_json__error__bad_backslash_escape);
                      goto exit;
                    }
                    status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(7);
                    v_string_length = 0;
                    v_char = 0;
                    goto label__string_loop_outer__continue;
                  }
                  v_uni4_string = (((uint64_t)(wuffs_base__peek_u48le__no_bounds_check(iop_a_src))) >> 16);
                  v_uni4_value = 0;
                  v_uni4_ok = 128;
                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni4_string >> 0))];
                  v_uni4_ok &= v_c;
                  v_uni4_value |= (((uint32_t)((v_c & 15))) << 12);
                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni4_string >> 8))];
                  v_uni4_ok &= v_c;
                  v_uni4_value |= (((uint32_t)((v_c & 15))) << 8);
                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni4_string >> 16))];
                  v_uni4_ok &= v_c;
                  v_uni4_value |= (((uint32_t)((v_c & 15))) << 4);
                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni4_string >> 24))];
                  v_uni4_ok &= v_c;
                  v_uni4_value |= (((uint32_t)((v_c & 15))) << 0);
                  if (v_uni4_ok == 0) {
                  } else if ((v_uni4_value < 55296) || (57343 < v_uni4_value)) {
                    iop_a_src += 6;
                    *iop_a_dst++ = wuffs_base__make_token(
                        (((uint64_t)((6291456 | v_uni4_value))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                        (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                        (((uint64_t)(6)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                    goto label__string_loop_outer__continue;
                  } else if (v_uni4_value >= 56320) {
                  } else {
                    if (((uint64_t)(io2_a_src - iop_a_src)) < 12) {
                      if (a_src && a_src->meta.closed) {
                        if (self->private_impl.f_quirks[20]) {
                          iop_a_src += 6;
                          *iop_a_dst++ = wuffs_base__make_token(
                              (((uint64_t)(6356989)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                              (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                              (((uint64_t)(6)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                          goto label__string_loop_outer__continue;
                        }
                        status = wuffs_base__make_status(wuffs_json__error__bad_backslash_escape);
                        goto exit;
                      }
                      status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(8);
                      v_string_length = 0;
                      v_uni4_value = 0;
                      v_char = 0;
                      goto label__string_loop_outer__continue;
                    }
                    v_uni4_string = (wuffs_base__peek_u64le__no_bounds_check(iop_a_src + 4) >> 16);
                    if (((255 & (v_uni4_string >> 0)) != 92) || ((255 & (v_uni4_string >> 8)) != 117)) {
                      v_uni4_high_surrogate = 0;
                      v_uni4_value = 0;
                      v_uni4_ok = 0;
                    } else {
                      v_uni4_high_surrogate = (65536 + ((v_uni4_value - 55296) << 10));
                      v_uni4_value = 0;
                      v_uni4_ok = 128;
                      v_uni4_string >>= 16;
                      v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni4_string >> 0))];
                      v_uni4_ok &= v_c;
                      v_uni4_value |= (((uint32_t)((v_c & 15))) << 12);
                      v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni4_string >> 8))];
                      v_uni4_ok &= v_c;
                      v_uni4_value |= (((uint32_t)((v_c & 15))) << 8);
                      v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni4_string >> 16))];
                      v_uni4_ok &= v_c;
                      v_uni4_value |= (((uint32_t)((v_c & 15))) << 4);
                      v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni4_string >> 24))];
                      v_uni4_ok &= v_c;
                      v_uni4_value |= (((uint32_t)((v_c & 15))) << 0);
                    }
                    if ((v_uni4_ok != 0) && (56320 <= v_uni4_value) && (v_uni4_value <= 57343)) {
                      v_uni4_value -= 56320;
                      iop_a_src += 12;
                      *iop_a_dst++ = wuffs_base__make_token(
                          (((uint64_t)((6291456 | v_uni4_high_surrogate | v_uni4_value))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                          (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                          (((uint64_t)(12)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                      goto label__string_loop_outer__continue;
                    }
                  }
                  if (self->private_impl.f_quirks[20]) {
                    if (((uint64_t)(io2_a_src - iop_a_src)) < 6) {
                      status = wuffs_base__make_status(wuffs_json__error__internal_error_inconsistent_i_o);
                      goto exit;
                    }
                    iop_a_src += 6;
                    *iop_a_dst++ = wuffs_base__make_token(
                        (((uint64_t)(6356989)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                        (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                        (((uint64_t)(6)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                    goto label__string_loop_outer__continue;
                  }
                } else if ((v_c == 85) && self->private_impl.f_quirks[2]) {
                  if (((uint64_t)(io2_a_src - iop_a_src)) < 10) {
                    if (a_src && a_src->meta.closed) {
                      status = wuffs_base__make_status(wuffs_json__error__bad_backslash_escape);
                      goto exit;
                    }
                    status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(9);
                    v_string_length = 0;
                    v_char = 0;
                    goto label__string_loop_outer__continue;
                  }
                  v_uni8_string = wuffs_base__peek_u64le__no_bounds_check(iop_a_src + 2);
                  v_uni8_value = 0;
                  v_uni8_ok = 128;
                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni8_string >> 0))];
                  v_uni8_ok &= v_c;
                  v_uni8_value |= (((uint32_t)((v_c & 15))) << 28);
                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni8_string >> 8))];
                  v_uni8_ok &= v_c;
                  v_uni8_value |= (((uint32_t)((v_c & 15))) << 24);
                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni8_string >> 16))];
                  v_uni8_ok &= v_c;
                  v_uni8_value |= (((uint32_t)((v_c & 15))) << 20);
                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni8_string >> 24))];
                  v_uni8_ok &= v_c;
                  v_uni8_value |= (((uint32_t)((v_c & 15))) << 16);
                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni8_string >> 32))];
                  v_uni8_ok &= v_c;
                  v_uni8_value |= (((uint32_t)((v_c & 15))) << 12);
                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni8_string >> 40))];
                  v_uni8_ok &= v_c;
                  v_uni8_value |= (((uint32_t)((v_c & 15))) << 8);
                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni8_string >> 48))];
                  v_uni8_ok &= v_c;
                  v_uni8_value |= (((uint32_t)((v_c & 15))) << 4);
                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni8_string >> 56))];
                  v_uni8_ok &= v_c;
                  v_uni8_value |= (((uint32_t)((v_c & 15))) << 0);
                  if (v_uni8_ok == 0) {
                  } else if ((v_uni8_value < 55296) || ((57343 < v_uni8_value) && (v_uni8_value <= 1114111))) {
                    iop_a_src += 10;
                    *iop_a_dst++ = wuffs_base__make_token(
                        (((uint64_t)((6291456 | (v_uni8_value & 2097151)))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                        (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                        (((uint64_t)(10)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                    goto label__string_loop_outer__continue;
                  } else if (self->private_impl.f_quirks[20]) {
                    iop_a_src += 10;
                    *iop_a_dst++ = wuffs_base__make_token(
                        (((uint64_t)(6356989)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                        (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                        (((uint64_t)(10)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                    goto label__string_loop_outer__continue;
                  }
                } else if ((v_c == 120) && self->private_impl.f_quirks[9]) {
                  if (((uint64_t)(io2_a_src - iop_a_src)) < 4) {
                    if (a_src && a_src->meta.closed) {
                      status = wuffs_base__make_status(wuffs_json__error__bad_backslash_escape);
                      goto exit;
                    }
                    status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(10);
                    v_string_length = 0;
                    v_char = 0;
                    goto label__string_loop_outer__continue;
                  }
                  v_backslash_x_string = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
                  v_backslash_x_ok = 128;
                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_backslash_x_string >> 16))];
                  v_backslash_x_ok &= v_c;
                  v_backslash_x_value = ((uint8_t)(((v_c & 15) << 4)));
                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_backslash_x_string >> 24))];
                  v_backslash_x_ok &= v_c;
                  v_backslash_x_value = ((uint8_t)((v_backslash_x_value | (v_c & 15))));
                  if ((v_backslash_x_ok == 0) || ((v_backslash_x_string & 65535) != 30812)) {
                    status = wuffs_base__make_status(wuffs_json__error__bad_backslash_escape);
                    goto exit;
                  }
                  iop_a_src += 4;
                  *iop_a_dst++ = wuffs_base__make_token(
                      (((uint64_t)((6291456 | ((uint32_t)(v_backslash_x_value))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                      (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                      (((uint64_t)(4)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                  goto label__string_loop_outer__continue;
                }
                status = wuffs_base__make_status(wuffs_json__error__bad_backslash_escape);
                goto exit;
              } else if (v_char == 3) {
                if (((uint64_t)(io2_a_src - iop_a_src)) < 2) {
                  if (v_string_length > 0) {
                    *iop_a_dst++ = wuffs_base__make_token(
                        (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                        (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                        (((uint64_t)(v_string_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                    v_string_length = 0;
                    if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
                      goto label__string_loop_outer__continue;
                    }
                  }
                  if (a_src && a_src->meta.closed) {
                    if (self->private_impl.f_quirks[20]) {
                      *iop_a_dst++ = wuffs_base__make_token(
                          (((uint64_t)(6356989)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                          (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                          (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                      iop_a_src += 1;
                      goto label__string_loop_outer__continue;
                    }
                    status = wuffs_base__make_status(wuffs_json__error__bad_utf_8);
                    goto exit;
                  }
                  status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                  WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(11);
                  v_string_length = 0;
                  v_char = 0;
                  goto label__string_loop_outer__continue;
                }
                v_multi_byte_utf8 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
                if ((v_multi_byte_utf8 & 49152) == 32768) {
                  v_multi_byte_utf8 = ((1984 & ((uint32_t)(v_multi_byte_utf8 << 6))) | (63 & (v_multi_byte_utf8 >> 8)));
                  iop_a_src += 2;
                  if (v_string_length >= 65528) {
                    *iop_a_dst++ = wuffs_base__make_token(
                        (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                        (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                        (((uint64_t)((v_string_length + 2))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                    v_string_length = 0;
                    goto label__string_loop_outer__continue;
                  }
                  v_string_length += 2;
                  goto label__string_loop_inner__continue;
                }
              } else if (v_char == 4) {
                if (((uint64_t)(io2_a_src - iop_a_src)) < 3) {
                  if (v_string_length > 0) {
                    *iop_a_dst++ = wuffs_base__make_token(
                        (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                        (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                        (((uint64_t)(v_string_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                    v_string_length = 0;
                    if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
                      goto label__string_loop_outer__continue;
                    }
                  }
                  if (a_src && a_src->meta.closed) {
                    if (self->private_impl.f_quirks[20]) {
                      *iop_a_dst++ = wuffs_base__make_token(
                          (((uint64_t)(6356989)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                          (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                          (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                      iop_a_src += 1;
                      goto label__string_loop_outer__continue;
                    }
                    status = wuffs_base__make_status(wuffs_json__error__bad_utf_8);
                    goto exit;
                  }
                  status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                  WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(12);
                  v_string_length = 0;
                  v_char = 0;
                  goto label__string_loop_outer__continue;
                }
                v_multi_byte_utf8 = ((uint32_t)(wuffs_base__peek_u24le__no_bounds_check(iop_a_src)));
                if ((v_multi_byte_utf8 & 12632064) == 8421376) {
                  v_multi_byte_utf8 = ((61440 & ((uint32_t)(v_multi_byte_utf8 << 12))) | (4032 & (v_multi_byte_utf8 >> 2)) | (63 & (v_multi_byte_utf8 >> 16)));
                  if ((2047 < v_multi_byte_utf8) && ((v_multi_byte_utf8 < 55296) || (57343 < v_multi_byte_utf8))) {
                    iop_a_src += 3;
                    if (v_string_length >= 65528) {
                      *iop_a_dst++ = wuffs_base__make_token(
                          (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                          (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                          (((uint64_t)((v_string_length + 3))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                      v_string_length = 0;
                      goto label__string_loop_outer__continue;
                    }
                    v_string_length += 3;
                    goto label__string_loop_inner__continue;
                  }
                }
              } else if (v_char == 5) {
                if (((uint64_t)(io2_a_src - iop_a_src)) < 4) {
                  if (v_string_length > 0) {
                    *iop_a_dst++ = wuffs_base__make_token(
                        (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                        (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                        (((uint64_t)(v_string_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                    v_string_length = 0;
                    if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
                      goto label__string_loop_outer__continue;
                    }
                  }
                  if (a_src && a_src->meta.closed) {
                    if (self->private_impl.f_quirks[20]) {
                      *iop_a_dst++ = wuffs_base__make_token(
                          (((uint64_t)(6356989)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                          (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                          (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                      iop_a_src += 1;
                      goto label__string_loop_outer__continue;
                    }
                    status = wuffs_base__make_status(wuffs_json__error__bad_utf_8);
                    goto exit;
                  }
                  status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                  WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(13);
                  v_string_length = 0;
                  v_char = 0;
                  goto label__string_loop_outer__continue;
                }
                v_multi_byte_utf8 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
                if ((v_multi_byte_utf8 & 3233857536) == 2155905024) {
                  v_multi_byte_utf8 = ((1835008 & ((uint32_t)(v_multi_byte_utf8 << 18))) |
                      (258048 & ((uint32_t)(v_multi_byte_utf8 << 4))) |
                      (4032 & (v_multi_byte_utf8 >> 10)) |
                      (63 & (v_multi_byte_utf8 >> 24)));
                  if ((65535 < v_multi_byte_utf8) && (v_multi_byte_utf8 <= 1114111)) {
                    iop_a_src += 4;
                    if (v_string_length >= 65528) {
                      *iop_a_dst++ = wuffs_base__make_token(
                          (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                          (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                          (((uint64_t)((v_string_length + 4))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                      v_string_length = 0;
                      goto label__string_loop_outer__continue;
                    }
                    v_string_length += 4;
                    goto label__string_loop_inner__continue;
                  }
                }
              }
              if (v_string_length > 0) {
                *iop_a_dst++ = wuffs_base__make_token(
                    (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                    (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                    (((uint64_t)(v_string_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                v_string_length = 0;
                if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
                  goto label__string_loop_outer__continue;
                }
              }
              if ((v_char & 128) != 0) {
                if (self->private_impl.f_quirks[0]) {
                  *iop_a_dst++ = wuffs_base__make_token(
                      (((uint64_t)((6291456 | ((uint32_t)((v_char & 127)))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                      (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                      (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                  iop_a_src += 1;
                  goto label__string_loop_outer__continue;
                }
                if (v_char == 138) {
                  status = wuffs_base__make_status(wuffs_json__error__bad_new_line_in_a_string);
                  goto exit;
                }
                status = wuffs_base__make_status(wuffs_json__error__bad_c0_control_code);
                goto exit;
              }
              if (self->private_impl.f_quirks[20]) {
                *iop_a_dst++ = wuffs_base__make_token(
                    (((uint64_t)(6356989)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                    (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                    (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
                iop_a_src += 1;
                goto label__string_loop_outer__continue;
              }
              status = wuffs_base__make_status(wuffs_json__error__bad_utf_8);
              goto exit;
            }
          }
          label__string_loop_outer__break:;
          label__1__continue:;
          while (true) {
            if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
              if (a_src && a_src->meta.closed) {
                status = wuffs_base__make_status(wuffs_json__error__bad_input);
                goto exit;
              }
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(14);
              goto label__1__continue;
            }
            if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_write);
              WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(15);
              goto label__1__continue;
            }
            iop_a_src += 1;
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(4194579)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            goto label__1__break;
          }
          label__1__break:;
          if (0 == (v_expect & (((uint32_t)(1)) << 4))) {
            v_expect = 4104;
            goto label__outer__continue;
          }
          goto label__goto_parsed_a_leaf_value__break;
        } else if (v_class == 2) {
          iop_a_src += 1;
          *iop_a_dst++ = wuffs_base__make_token(
              (((uint64_t)(1)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
              (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
          if (0 == (v_expect & (((uint32_t)(1)) << 8))) {
            if (self->private_impl.f_quirks[13]) {
              v_expect = 4162;
            } else {
              v_expect = 4098;
            }
          } else {
            if (self->private_impl.f_quirks[13]) {
              v_expect = 8114;
            } else {
              v_expect = 7858;
            }
          }
          goto label__outer__continue;
        } else if (v_class == 3) {
          iop_a_src += 1;
          *iop_a_dst++ = wuffs_base__make_token(
              (((uint64_t)(1)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
              (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
          v_expect = 7858;
          goto label__outer__continue;
        } else if (v_class == 4) {
          while (true) {
            if (a_src) {
              a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
            }
            v_number_length = wuffs_json__decoder__decode_number(self, a_src);
            if (a_src) {
              iop_a_src = a_src->data.ptr + a_src->meta.ri;
            }
            v_number_status = (v_number_length >> 8);
            v_vminor = 10486787;
            if ((v_number_length & 128) != 0) {
              v_vminor = 10486785;
            }
            v_number_length = (v_number_length & 127);
            if (v_number_status == 0) {
              *iop_a_dst++ = wuffs_base__make_token(
                  (((uint64_t)(v_vminor)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                  (((uint64_t)(v_number_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
              goto label__2__break;
            }
            while (v_number_length > 0) {
              v_number_length -= 1;
              if (iop_a_src > io1_a_src) {
                iop_a_src--;
              } else {
                status = wuffs_base__make_status(wuffs_json__error__internal_error_inconsistent_i_o);
                goto exit;
              }
            }
            if (v_number_status == 1) {
              if (self->private_impl.f_quirks[14]) {
                if (a_dst) {
                  a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
                }
                if (a_src) {
                  a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
                }
                WUFFS_BASE__COROUTINE_SUSPENSION_POINT(16);
                status = wuffs_json__decoder__decode_inf_nan(self, a_dst, a_src);
                if (a_dst) {
                  iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
                }
                if (a_src) {
                  iop_a_src = a_src->data.ptr + a_src->meta.ri;
                }
                if (status.repr) {
                  goto suspend;
                }
                goto label__2__break;
              }
              status = wuffs_base__make_status(wuffs_json__error__bad_input);
              goto exit;
            } else if (v_number_status == 2) {
              status = wuffs_base__make_status(wuffs_json__error__unsupported_number_length);
              goto exit;
            } else {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(17);
              while (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
                status = wuffs_base__make_status(wuffs_base__suspension__short_write);
                WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(18);
              }
            }
          }
          label__2__break:;
          goto label__goto_parsed_a_leaf_value__break;
        } else if (v_class == 5) {
          v_vminor = 2113553;
          if (v_depth == 0) {
          } else if (0 != (v_expect_after_value & (((uint32_t)(1)) << 6))) {
            v_vminor = 2113601;
          } else {
            v_vminor = 2113569;
          }
          if (v_depth >= 1024) {
            status = wuffs_base__make_status(wuffs_json__error__unsupported_recursion_depth);
            goto exit;
          }
          v_stack_byte = (v_depth / 32);
          v_stack_bit = (v_depth & 31);
          self->private_data.f_stack[v_stack_byte] |= (((uint32_t)(1)) << v_stack_bit);
          v_depth += 1;
          iop_a_src += 1;
          *iop_a_dst++ = wuffs_base__make_token(
              (((uint64_t)(v_vminor)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
              (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
          v_expect = 4162;
          v_expect_after_value = 4164;
          goto label__outer__continue;
        } else if (v_class == 6) {
          iop_a_src += 1;
          if (v_depth <= 1) {
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(2101314)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            goto label__outer__break;
          }
          v_depth -= 1;
          v_stack_byte = ((v_depth - 1) / 32);
          v_stack_bit = ((v_depth - 1) & 31);
          if (0 == (self->private_data.f_stack[v_stack_byte] & (((uint32_t)(1)) << v_stack_bit))) {
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(2105410)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            v_expect = 4356;
            v_expect_after_value = 4356;
          } else {
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(2113602)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            v_expect = 4164;
            v_expect_after_value = 4164;
          }
          goto label__outer__continue;
        } else if (v_class == 7) {
          v_vminor = 2105361;
          if (v_depth == 0) {
          } else if (0 != (v_expect_after_value & (((uint32_t)(1)) << 6))) {
            v_vminor = 2105409;
          } else {
            v_vminor = 2105377;
          }
          if (v_depth >= 1024) {
            status = wuffs_base__make_status(wuffs_json__error__unsupported_recursion_depth);
            goto exit;
          }
          v_stack_byte = (v_depth / 32);
          v_stack_bit = (v_depth & 31);
          self->private_data.f_stack[v_stack_byte] &= (4294967295 ^ (((uint32_t)(1)) << v_stack_bit));
          v_depth += 1;
          iop_a_src += 1;
          *iop_a_dst++ = wuffs_base__make_token(
              (((uint64_t)(v_vminor)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
              (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
          v_expect = 8114;
          v_expect_after_value = 4356;
          goto label__outer__continue;
        } else if (v_class == 8) {
          iop_a_src += 1;
          if (v_depth <= 1) {
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(2101282)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            goto label__outer__break;
          }
          v_depth -= 1;
          v_stack_byte = ((v_depth - 1) / 32);
          v_stack_bit = ((v_depth - 1) & 31);
          if (0 == (self->private_data.f_stack[v_stack_byte] & (((uint32_t)(1)) << v_stack_bit))) {
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(2105378)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            v_expect = 4356;
            v_expect_after_value = 4356;
          } else {
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(2113570)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            v_expect = 4164;
            v_expect_after_value = 4164;
          }
          goto label__outer__continue;
        } else if (v_class == 9) {
          v_match = wuffs_base__io_reader__match7(iop_a_src, io2_a_src, a_src,111546413966853);
          if (v_match == 0) {
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(8388612)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)(5)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            if (((uint64_t)(io2_a_src - iop_a_src)) < 5) {
              status = wuffs_base__make_status(wuffs_json__error__internal_error_inconsistent_i_o);
              goto exit;
            }
            iop_a_src += 5;
            goto label__goto_parsed_a_leaf_value__break;
          } else if (v_match == 1) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(19);
            goto label__outer__continue;
          }
        } else if (v_class == 10) {
          v_match = wuffs_base__io_reader__match7(iop_a_src, io2_a_src, a_src,435762131972);
          if (v_match == 0) {
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(8388616)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)(4)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            if (((uint64_t)(io2_a_src - iop_a_src)) < 4) {
              status = wuffs_base__make_status(wuffs_json__error__internal_error_inconsistent_i_o);
              goto exit;
            }
            iop_a_src += 4;
            goto label__goto_parsed_a_leaf_value__break;
          } else if (v_match == 1) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(20);
            goto label__outer__continue;
          }
        } else if (v_class == 11) {
          v_match = wuffs_base__io_reader__match7(iop_a_src, io2_a_src, a_src,465676103172);
          if (v_match == 0) {
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(8388610)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)(4)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            if (((uint64_t)(io2_a_src - iop_a_src)) < 4) {
              status = wuffs_base__make_status(wuffs_json__error__internal_error_inconsistent_i_o);
              goto exit;
            }
            iop_a_src += 4;
            goto label__goto_parsed_a_leaf_value__break;
          } else if (v_match == 1) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(21);
            goto label__outer__continue;
          }
          if (self->private_impl.f_quirks[14]) {
            if (a_dst) {
              a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
            }
            if (a_src) {
              a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
            }
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(22);
            status = wuffs_json__decoder__decode_inf_nan(self, a_dst, a_src);
            if (a_dst) {
              iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
            }
            if (a_src) {
              iop_a_src = a_src->data.ptr + a_src->meta.ri;
            }
            if (status.repr) {
              goto suspend;
            }
            goto label__goto_parsed_a_leaf_value__break;
          }
        } else if (v_class == 12) {
          if (self->private_impl.f_quirks[11] || self->private_impl.f_quirks[12]) {
            if (a_dst) {
              a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
            }
            if (a_src) {
              a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
            }
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(23);
            status = wuffs_json__decoder__decode_comment(self, a_dst, a_src);
            if (a_dst) {
              iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
            }
            if (a_src) {
              iop_a_src = a_src->data.ptr + a_src->meta.ri;
            }
            if (status.repr) {
              goto suspend;
            }
            if (self->private_impl.f_comment_type > 0) {
              goto label__outer__continue;
            }
          }
        }
        status = wuffs_base__make_status(wuffs_json__error__bad_input);
        goto exit;
      }
      label__goto_parsed_a_leaf_value__break:;
      if (v_depth == 0) {
        goto label__outer__break;
      }
      v_expect = v_expect_after_value;
    }
    label__outer__break:;
    if (self->private_impl.f_quirks[17] || self->private_impl.f_quirks[18]) {
      if (a_dst) {
        a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
      }
      if (a_src) {
        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
      }
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(24);
      status = wuffs_json__decoder__decode_trailer(self, a_dst, a_src);
      if (a_dst) {
        iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
      }
      if (a_src) {
        iop_a_src = a_src->data.ptr + a_src->meta.ri;
      }
      if (status.repr) {
        goto suspend;
      }
    }
    self->private_impl.f_end_of_data = true;

    goto ok;
    ok:
    self->private_impl.p_decode_tokens[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_tokens[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 1 : 0;
  self->private_data.s_decode_tokens[0].v_depth = v_depth;
  self->private_data.s_decode_tokens[0].v_expect = v_expect;
  self->private_data.s_decode_tokens[0].v_expect_after_value = v_expect_after_value;

  goto exit;
  exit:
  if (a_dst) {
    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
  }
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func json.decoder.decode_number

static uint32_t
wuffs_json__decoder__decode_number(
    wuffs_json__decoder* self,
    wuffs_base__io_buffer* a_src) {
  uint8_t v_c = 0;
  uint32_t v_n = 0;
  uint32_t v_floating_point = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  while (true) {
    v_n = 0;
    if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
      if ( ! (a_src && a_src->meta.closed)) {
        v_n |= 768;
      }
      goto label__goto_done__break;
    }
    v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
    if (v_c != 45) {
    } else {
      v_n += 1;
      iop_a_src += 1;
      if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
        if ( ! (a_src && a_src->meta.closed)) {
          v_n |= 768;
        }
        v_n |= 256;
        goto label__goto_done__break;
      }
      v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
    }
    if (v_c == 48) {
      v_n += 1;
      iop_a_src += 1;
    } else {
      if (a_src) {
        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
      }
      v_n = wuffs_json__decoder__decode_digits(self, a_src, v_n);
      if (a_src) {
        iop_a_src = a_src->data.ptr + a_src->meta.ri;
      }
      if (v_n > 99) {
        goto label__goto_done__break;
      }
    }
    if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
      if ( ! (a_src && a_src->meta.closed)) {
        v_n |= 768;
      }
      goto label__goto_done__break;
    }
    v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
    if (v_c != 46) {
    } else {
      if (v_n >= 99) {
        v_n |= 512;
        goto label__goto_done__break;
      }
      v_n += 1;
      iop_a_src += 1;
      v_floating_point = 128;
      if (a_src) {
        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
      }
      v_n = wuffs_json__decoder__decode_digits(self, a_src, v_n);
      if (a_src) {
        iop_a_src = a_src->data.ptr + a_src->meta.ri;
      }
      if (v_n > 99) {
        goto label__goto_done__break;
      }
      if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
        if ( ! (a_src && a_src->meta.closed)) {
          v_n |= 768;
        }
        goto label__goto_done__break;
      }
      v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
    }
    if ((v_c != 69) && (v_c != 101)) {
      goto label__goto_done__break;
    }
    if (v_n >= 99) {
      v_n |= 512;
      goto label__goto_done__break;
    }
    v_n += 1;
    iop_a_src += 1;
    v_floating_point = 128;
    if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
      if ( ! (a_src && a_src->meta.closed)) {
        v_n |= 768;
      }
      v_n |= 256;
      goto label__goto_done__break;
    }
    v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
    if ((v_c != 43) && (v_c != 45)) {
    } else {
      if (v_n >= 99) {
        v_n |= 512;
        goto label__goto_done__break;
      }
      v_n += 1;
      iop_a_src += 1;
    }
    if (a_src) {
      a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
    }
    v_n = wuffs_json__decoder__decode_digits(self, a_src, v_n);
    if (a_src) {
      iop_a_src = a_src->data.ptr + a_src->meta.ri;
    }
    goto label__goto_done__break;
  }
  label__goto_done__break:;
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }
  return (v_n | v_floating_point);
}

// -------- func json.decoder.decode_digits

static uint32_t
wuffs_json__decoder__decode_digits(
    wuffs_json__decoder* self,
    wuffs_base__io_buffer* a_src,
    uint32_t a_n) {
  uint8_t v_c = 0;
  uint32_t v_n = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  v_n = a_n;
  while (true) {
    if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
      if ( ! (a_src && a_src->meta.closed)) {
        v_n |= 768;
      }
      goto label__0__break;
    }
    v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
    if (0 == WUFFS_JSON__LUT_DECIMAL_DIGITS[v_c]) {
      goto label__0__break;
    }
    if (v_n >= 99) {
      v_n |= 512;
      goto label__0__break;
    }
    v_n += 1;
    iop_a_src += 1;
  }
  label__0__break:;
  if (v_n == a_n) {
    v_n |= 256;
  }
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }
  return v_n;
}

// -------- func json.decoder.decode_leading

static wuffs_base__status
wuffs_json__decoder__decode_leading(
    wuffs_json__decoder* self,
    wuffs_base__token_buffer* a_dst,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint8_t v_c = 0;
  uint32_t v_u = 0;

  wuffs_base__token* iop_a_dst = NULL;
  wuffs_base__token* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  wuffs_base__token* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  wuffs_base__token* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_dst) {
    io0_a_dst = a_dst->data.ptr;
    io1_a_dst = io0_a_dst + a_dst->meta.wi;
    iop_a_dst = io1_a_dst;
    io2_a_dst = io0_a_dst + a_dst->data.len;
    if (a_dst->meta.closed) {
      io2_a_dst = iop_a_dst;
    }
  }
  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_leading[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    self->private_impl.f_allow_leading_ars = self->private_impl.f_quirks[15];
    self->private_impl.f_allow_leading_ubom = self->private_impl.f_quirks[16];
    label__0__continue:;
    while (self->private_impl.f_allow_leading_ars || self->private_impl.f_allow_leading_ubom) {
      if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_write);
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
        goto label__0__continue;
      }
      if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
        if (a_src && a_src->meta.closed) {
          goto label__0__break;
        }
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
        goto label__0__continue;
      }
      v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
      if ((v_c == 30) && self->private_impl.f_allow_leading_ars) {
        self->private_impl.f_allow_leading_ars = false;
        iop_a_src += 1;
        *iop_a_dst++ = wuffs_base__make_token(
            (((uint64_t)(0)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
            (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
        goto label__0__continue;
      } else if ((v_c == 239) && self->private_impl.f_allow_leading_ubom) {
        if (((uint64_t)(io2_a_src - iop_a_src)) < 3) {
          if (a_src && a_src->meta.closed) {
            goto label__0__break;
          }
          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(3);
          goto label__0__continue;
        }
        v_u = ((uint32_t)(wuffs_base__peek_u24le__no_bounds_check(iop_a_src)));
        if (v_u == 12565487) {
          self->private_impl.f_allow_leading_ubom = false;
          iop_a_src += 3;
          *iop_a_dst++ = wuffs_base__make_token(
              (((uint64_t)(0)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
              (((uint64_t)(3)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
          goto label__0__continue;
        }
      }
      goto label__0__break;
    }
    label__0__break:;

    goto ok;
    ok:
    self->private_impl.p_decode_leading[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_leading[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;

  goto exit;
  exit:
  if (a_dst) {
    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
  }
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func json.decoder.decode_comment

static wuffs_base__status
wuffs_json__decoder__decode_comment(
    wuffs_json__decoder* self,
    wuffs_base__token_buffer* a_dst,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint8_t v_c = 0;
  uint16_t v_c2 = 0;
  uint32_t v_length = 0;

  wuffs_base__token* iop_a_dst = NULL;
  wuffs_base__token* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  wuffs_base__token* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  wuffs_base__token* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_dst) {
    io0_a_dst = a_dst->data.ptr;
    io1_a_dst = io0_a_dst + a_dst->meta.wi;
    iop_a_dst = io1_a_dst;
    io2_a_dst = io0_a_dst + a_dst->data.len;
    if (a_dst->meta.closed) {
      io2_a_dst = iop_a_dst;
    }
  }
  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_comment[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    self->private_impl.f_comment_type = 0;
    label__0__continue:;
    while ((((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) || (((uint64_t)(io2_a_src - iop_a_src)) <= 1)) {
      if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_write);
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
        goto label__0__continue;
      }
      if (a_src && a_src->meta.closed) {
        status = wuffs_base__make_status(NULL);
        goto ok;
      }
      status = wuffs_base__make_status(wuffs_base__suspension__short_read);
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
    }
    v_c2 = wuffs_base__peek_u16le__no_bounds_check(iop_a_src);
    if ((v_c2 == 10799) && self->private_impl.f_quirks[11]) {
      iop_a_src += 2;
      v_length = 2;
      label__comment_block__continue:;
      while (true) {
        if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
          status = wuffs_base__make_status(wuffs_base__suspension__short_write);
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(3);
          v_length = 0;
          goto label__comment_block__continue;
        }
        while (true) {
          if (((uint64_t)(io2_a_src - iop_a_src)) <= 1) {
            if (v_length > 0) {
              *iop_a_dst++ = wuffs_base__make_token(
                  (((uint64_t)(2)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                  (((uint64_t)(v_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            }
            if (a_src && a_src->meta.closed) {
              status = wuffs_base__make_status(wuffs_json__error__bad_input);
              goto exit;
            }
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(4);
            v_length = 0;
            goto label__comment_block__continue;
          }
          v_c2 = wuffs_base__peek_u16le__no_bounds_check(iop_a_src);
          if (v_c2 == 12074) {
            iop_a_src += 2;
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(2)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)((v_length + 2))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            self->private_impl.f_comment_type = 1;
            status = wuffs_base__make_status(NULL);
            goto ok;
          }
          iop_a_src += 1;
          if (v_length >= 65533) {
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(2)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                (((uint64_t)((v_length + 1))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            v_length = 0;
            goto label__comment_block__continue;
          }
          v_length += 1;
        }
      }
    } else if ((v_c2 == 12079) && self->private_impl.f_quirks[12]) {
      iop_a_src += 2;
      v_length = 2;
      label__comment_line__continue:;
      while (true) {
        if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
          status = wuffs_base__make_status(wuffs_base__suspension__short_write);
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(5);
          v_length = 0;
          goto label__comment_line__continue;
        }
        while (true) {
          if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
            if (v_length > 0) {
              *iop_a_dst++ = wuffs_base__make_token(
                  (((uint64_t)(4)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                  (((uint64_t)(v_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            }
            if (a_src && a_src->meta.closed) {
              status = wuffs_base__make_status(wuffs_json__error__bad_input);
              goto exit;
            }
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(6);
            v_length = 0;
            goto label__comment_line__continue;
          }
          v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
          if (v_c == 10) {
            iop_a_src += 1;
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(4)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)((v_length + 1))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            self->private_impl.f_comment_type = 2;
            status = wuffs_base__make_status(NULL);
            goto ok;
          }
          iop_a_src += 1;
          if (v_length >= 65533) {
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(4)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                (((uint64_t)((v_length + 1))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            v_length = 0;
            goto label__comment_line__continue;
          }
          v_length += 1;
        }
      }
    }

    goto ok;
    ok:
    self->private_impl.p_decode_comment[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_comment[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;

  goto exit;
  exit:
  if (a_dst) {
    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
  }
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func json.decoder.decode_inf_nan

static wuffs_base__status
wuffs_json__decoder__decode_inf_nan(
    wuffs_json__decoder* self,
    wuffs_base__token_buffer* a_dst,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint32_t v_c4 = 0;
  uint32_t v_neg = 0;

  wuffs_base__token* iop_a_dst = NULL;
  wuffs_base__token* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  wuffs_base__token* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  wuffs_base__token* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_dst) {
    io0_a_dst = a_dst->data.ptr;
    io1_a_dst = io0_a_dst + a_dst->meta.wi;
    iop_a_dst = io1_a_dst;
    io2_a_dst = io0_a_dst + a_dst->data.len;
    if (a_dst->meta.closed) {
      io2_a_dst = iop_a_dst;
    }
  }
  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_inf_nan[0];
  if (coro_susp_point) {
    v_neg = self->private_data.s_decode_inf_nan[0].v_neg;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    label__0__continue:;
    while (true) {
      if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_write);
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
        goto label__0__continue;
      }
      if (((uint64_t)(io2_a_src - iop_a_src)) <= 2) {
        if (a_src && a_src->meta.closed) {
          status = wuffs_base__make_status(wuffs_json__error__bad_input);
          goto exit;
        }
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
        goto label__0__continue;
      }
      v_c4 = ((uint32_t)(wuffs_base__peek_u24le__no_bounds_check(iop_a_src)));
      if ((v_c4 | 2105376) == 6712937) {
        if (((uint64_t)(io2_a_src - iop_a_src)) > 7) {
          if ((wuffs_base__peek_u64le__no_bounds_check(iop_a_src) | 2314885530818453536) == 8751735898823356009) {
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(10485792)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)(8)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            iop_a_src += 8;
            status = wuffs_base__make_status(NULL);
            goto ok;
          }
        } else if ( ! (a_src && a_src->meta.closed)) {
          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(3);
          goto label__0__continue;
        }
        *iop_a_dst++ = wuffs_base__make_token(
            (((uint64_t)(10485792)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
            (((uint64_t)(3)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
        iop_a_src += 3;
        status = wuffs_base__make_status(NULL);
        goto ok;
      } else if ((v_c4 | 2105376) == 7233902) {
        *iop_a_dst++ = wuffs_base__make_token(
            (((uint64_t)(10485888)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
            (((uint64_t)(3)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
        iop_a_src += 3;
        status = wuffs_base__make_status(NULL);
        goto ok;
      } else if ((v_c4 & 255) == 43) {
        v_neg = 0;
      } else if ((v_c4 & 255) == 45) {
        v_neg = 1;
      } else {
        status = wuffs_base__make_status(wuffs_json__error__bad_input);
        goto exit;
      }
      if (((uint64_t)(io2_a_src - iop_a_src)) <= 3) {
        if (a_src && a_src->meta.closed) {
          status = wuffs_base__make_status(wuffs_json__error__bad_input);
          goto exit;
        }
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(4);
        goto label__0__continue;
      }
      v_c4 = (wuffs_base__peek_u32le__no_bounds_check(iop_a_src) >> 8);
      if ((v_c4 | 2105376) == 6712937) {
        if (((uint64_t)(io2_a_src - iop_a_src)) > 8) {
          if ((wuffs_base__peek_u64le__no_bounds_check(iop_a_src + 1) | 2314885530818453536) == 8751735898823356009) {
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)((10485760 | (((uint32_t)(32)) >> v_neg)))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)(9)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            iop_a_src += 9;
            status = wuffs_base__make_status(NULL);
            goto ok;
          }
        } else if ( ! (a_src && a_src->meta.closed)) {
          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(5);
          goto label__0__continue;
        }
        *iop_a_dst++ = wuffs_base__make_token(
            (((uint64_t)((10485760 | (((uint32_t)(32)) >> v_neg)))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
            (((uint64_t)(4)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
        iop_a_src += 4;
        status = wuffs_base__make_status(NULL);
        goto ok;
      } else if ((v_c4 | 2105376) == 7233902) {
        *iop_a_dst++ = wuffs_base__make_token(
            (((uint64_t)((10485760 | (((uint32_t)(128)) >> v_neg)))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
            (((uint64_t)(4)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
        iop_a_src += 4;
        status = wuffs_base__make_status(NULL);
        goto ok;
      }
      status = wuffs_base__make_status(wuffs_json__error__bad_input);
      goto exit;
    }

    goto ok;
    ok:
    self->private_impl.p_decode_inf_nan[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_inf_nan[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_data.s_decode_inf_nan[0].v_neg = v_neg;

  goto exit;
  exit:
  if (a_dst) {
    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
  }
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func json.decoder.decode_trailer

static wuffs_base__status
wuffs_json__decoder__decode_trailer(
    wuffs_json__decoder* self,
    wuffs_base__token_buffer* a_dst,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint8_t v_c = 0;
  uint32_t v_whitespace_length = 0;

  wuffs_base__token* iop_a_dst = NULL;
  wuffs_base__token* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  wuffs_base__token* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  wuffs_base__token* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_dst) {
    io0_a_dst = a_dst->data.ptr;
    io1_a_dst = io0_a_dst + a_dst->meta.wi;
    iop_a_dst = io1_a_dst;
    io2_a_dst = io0_a_dst + a_dst->data.len;
    if (a_dst->meta.closed) {
      io2_a_dst = iop_a_dst;
    }
  }
  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_trailer[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_quirks[18]) {
      self->private_impl.f_trailer_stop = 10;
    } else {
      self->private_impl.f_trailer_stop = 0;
    }
    label__outer__continue:;
    while (true) {
      if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_write);
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
        v_whitespace_length = 0;
        goto label__outer__continue;
      }
      while (true) {
        if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
          if (v_whitespace_length > 0) {
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(0)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)(v_whitespace_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            v_whitespace_length = 0;
          }
          if (a_src && a_src->meta.closed) {
            goto label__outer__break;
          }
          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
          v_whitespace_length = 0;
          goto label__outer__continue;
        }
        v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
        if (WUFFS_JSON__LUT_CLASSES[v_c] != 0) {
          if (v_whitespace_length > 0) {
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(0)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)(v_whitespace_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            v_whitespace_length = 0;
          }
          if (self->private_impl.f_trailer_stop > 0) {
            status = wuffs_base__make_status(wuffs_json__error__bad_input);
            goto exit;
          }
          if (a_dst) {
            a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
          }
          if (a_src) {
            a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
          }
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
          status = wuffs_json__decoder__decode_comment(self, a_dst, a_src);
          if (a_dst) {
            iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
          }
          if (a_src) {
            iop_a_src = a_src->data.ptr + a_src->meta.ri;
          }
          if (status.repr) {
            goto suspend;
          }
          v_c = 0;
          v_whitespace_length = 0;
          if (self->private_impl.f_comment_type > 0) {
            goto label__outer__continue;
          }
          status = wuffs_base__make_status(NULL);
          goto ok;
        }
        iop_a_src += 1;
        if ((v_whitespace_length >= 65534) || (v_c == self->private_impl.f_trailer_stop)) {
          *iop_a_dst++ = wuffs_base__make_token(
              (((uint64_t)(0)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
              (((uint64_t)((v_whitespace_length + 1))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
          v_whitespace_length = 0;
          if (v_c == self->private_impl.f_trailer_stop) {
            status = wuffs_base__make_status(NULL);
            goto ok;
          }
          goto label__outer__continue;
        }
        v_whitespace_length += 1;
      }
    }
    label__outer__break:;

    goto ok;
    ok:
    self->private_impl.p_decode_trailer[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_trailer[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;

  goto exit;
  exit:
  if (a_dst) {
    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
  }
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__JSON)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__NIE)

// ---------------- Status Codes Implementations

const char wuffs_nie__error__bad_header[] = "#nie: bad header";
const char wuffs_nie__error__unsupported_nie_file[] = "#nie: unsupported NIE file";
const char wuffs_nie__note__internal_note_short_read[] = "@nie: internal note: short read";

// ---------------- Private Consts

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

static wuffs_base__status
wuffs_nie__decoder__swizzle(
    wuffs_nie__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src);

// ---------------- VTables

const wuffs_base__image_decoder__func_ptrs
wuffs_nie__decoder__func_ptrs_for__wuffs_base__image_decoder = {
  (wuffs_base__status(*)(void*,
      wuffs_base__pixel_buffer*,
      wuffs_base__io_buffer*,
      wuffs_base__pixel_blend,
      wuffs_base__slice_u8,
      wuffs_base__decode_frame_options*))(&wuffs_nie__decoder__decode_frame),
  (wuffs_base__status(*)(void*,
      wuffs_base__frame_config*,
      wuffs_base__io_buffer*))(&wuffs_nie__decoder__decode_frame_config),
  (wuffs_base__status(*)(void*,
      wuffs_base__image_config*,
      wuffs_base__io_buffer*))(&wuffs_nie__decoder__decode_image_config),
  (wuffs_base__rect_ie_u32(*)(const void*))(&wuffs_nie__decoder__frame_dirty_rect),
  (uint32_t(*)(const void*))(&wuffs_nie__decoder__num_animation_loops),
  (uint64_t(*)(const void*))(&wuffs_nie__decoder__num_decoded_frame_configs),
  (uint64_t(*)(const void*))(&wuffs_nie__decoder__num_decoded_frames),
  (wuffs_base__status(*)(void*,
      uint64_t,
      uint64_t))(&wuffs_nie__decoder__restart_frame),
  (wuffs_base__empty_struct(*)(void*,
      uint32_t,
      bool))(&wuffs_nie__decoder__set_quirk_enabled),
  (wuffs_base__empty_struct(*)(void*,
      uint32_t,
      bool))(&wuffs_nie__decoder__set_report_metadata),
  (wuffs_base__status(*)(void*,
      wuffs_base__io_buffer*,
      wuffs_base__more_information*,
      wuffs_base__io_buffer*))(&wuffs_nie__decoder__tell_me_more),
  (wuffs_base__range_ii_u64(*)(const void*))(&wuffs_nie__decoder__workbuf_len),
};

// ---------------- Initializer Implementations

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_nie__decoder__initialize(
    wuffs_nie__decoder* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options){
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (sizeof(*self) != sizeof_star_self) {
    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
  }
  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
  }

  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
    // The whole point of this if-check is to detect an uninitialized *self.
    // We disable the warning on GCC. Clang-5.0 does not have this warning.
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
    if (self->private_impl.magic != 0) {
      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
    }
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
  } else {
    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    } else {
      memset(&(self->private_impl), 0, sizeof(self->private_impl));
    }
  }

  self->private_impl.magic = WUFFS_BASE__MAGIC;
  self->private_impl.vtable_for__wuffs_base__image_decoder.vtable_name =
      wuffs_base__image_decoder__vtable_name;
  self->private_impl.vtable_for__wuffs_base__image_decoder.function_pointers =
      (const void*)(&wuffs_nie__decoder__func_ptrs_for__wuffs_base__image_decoder);
  return wuffs_base__make_status(NULL);
}

wuffs_nie__decoder*
wuffs_nie__decoder__alloc() {
  wuffs_nie__decoder* x =
      (wuffs_nie__decoder*)(calloc(sizeof(wuffs_nie__decoder), 1));
  if (!x) {
    return NULL;
  }
  if (wuffs_nie__decoder__initialize(
      x, sizeof(wuffs_nie__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
    free(x);
    return NULL;
  }
  return x;
}

size_t
sizeof__wuffs_nie__decoder() {
  return sizeof(wuffs_nie__decoder);
}

// ---------------- Function Implementations

// -------- func nie.decoder.set_quirk_enabled

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_nie__decoder__set_quirk_enabled(
    wuffs_nie__decoder* self,
    uint32_t a_quirk,
    bool a_enabled) {
  return wuffs_base__make_empty_struct();
}

// -------- func nie.decoder.decode_image_config

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_nie__decoder__decode_image_config(
    wuffs_nie__decoder* self,
    wuffs_base__image_config* a_dst,
    wuffs_base__io_buffer* a_src) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 1)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint32_t v_a = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_image_config[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_call_sequence != 0) {
      status = wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
      goto exit;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      uint32_t t_0;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
        t_0 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
        iop_a_src += 4;
      } else {
        self->private_data.s_decode_image_config[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
          uint32_t num_bits_0 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_0;
          if (num_bits_0 == 24) {
            t_0 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_0 += 8;
          *scratch |= ((uint64_t)(num_bits_0)) << 56;
        }
      }
      v_a = t_0;
    }
    if (v_a != 1169146734) {
      status = wuffs_base__make_status(wuffs_nie__error__bad_header);
      goto exit;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
      uint32_t t_1;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
        t_1 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
        iop_a_src += 4;
      } else {
        self->private_data.s_decode_image_config[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
          uint32_t num_bits_1 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_1;
          if (num_bits_1 == 24) {
            t_1 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_1 += 8;
          *scratch |= ((uint64_t)(num_bits_1)) << 56;
        }
      }
      v_a = t_1;
    }
    if (v_a == 879649535) {
      self->private_impl.f_pixfmt = 2164295816;
    } else if (v_a == 946758399) {
      self->private_impl.f_pixfmt = 2164308923;
    } else if (v_a == 879780607) {
      status = wuffs_base__make_status(wuffs_nie__error__unsupported_nie_file);
      goto exit;
    } else if (v_a == 946889471) {
      status = wuffs_base__make_status(wuffs_nie__error__unsupported_nie_file);
      goto exit;
    } else {
      status = wuffs_base__make_status(wuffs_nie__error__bad_header);
      goto exit;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
      uint32_t t_2;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
        t_2 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
        iop_a_src += 4;
      } else {
        self->private_data.s_decode_image_config[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
          uint32_t num_bits_2 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_2;
          if (num_bits_2 == 24) {
            t_2 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_2 += 8;
          *scratch |= ((uint64_t)(num_bits_2)) << 56;
        }
      }
      v_a = t_2;
    }
    if (v_a >= 2147483648) {
      status = wuffs_base__make_status(wuffs_nie__error__bad_header);
      goto exit;
    }
    self->private_impl.f_width = v_a;
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
      uint32_t t_3;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
        t_3 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
        iop_a_src += 4;
      } else {
        self->private_data.s_decode_image_config[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
          uint32_t num_bits_3 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_3;
          if (num_bits_3 == 24) {
            t_3 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_3 += 8;
          *scratch |= ((uint64_t)(num_bits_3)) << 56;
        }
      }
      v_a = t_3;
    }
    if (v_a >= 2147483648) {
      status = wuffs_base__make_status(wuffs_nie__error__bad_header);
      goto exit;
    }
    self->private_impl.f_height = v_a;
    if (a_dst != NULL) {
      wuffs_base__image_config__set(
          a_dst,
          self->private_impl.f_pixfmt,
          0,
          self->private_impl.f_width,
          self->private_impl.f_height,
          16,
          false);
    }
    self->private_impl.f_call_sequence = 3;

    goto ok;
    ok:
    self->private_impl.p_decode_image_config[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_image_config[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 1 : 0;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func nie.decoder.decode_frame_config

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_nie__decoder__decode_frame_config(
    wuffs_nie__decoder* self,
    wuffs_base__frame_config* a_dst,
    wuffs_base__io_buffer* a_src) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 2)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_frame_config[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_call_sequence < 3) {
      if (a_src) {
        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
      }
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      status = wuffs_nie__decoder__decode_image_config(self, NULL, a_src);
      if (a_src) {
        iop_a_src = a_src->data.ptr + a_src->meta.ri;
      }
      if (status.repr) {
        goto suspend;
      }
    } else if (self->private_impl.f_call_sequence == 3) {
      if (16 != wuffs_base__u64__sat_add(a_src->meta.pos, ((uint64_t)(iop_a_src - io0_a_src)))) {
        status = wuffs_base__make_status(wuffs_base__error__bad_restart);
        goto exit;
      }
    } else if (self->private_impl.f_call_sequence == 4) {
      self->private_impl.f_call_sequence = 255;
      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
      goto ok;
    } else {
      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
      goto ok;
    }
    if (a_dst != NULL) {
      wuffs_base__frame_config__set(
          a_dst,
          wuffs_base__utility__make_rect_ie_u32(
          0,
          0,
          self->private_impl.f_width,
          self->private_impl.f_height),
          ((wuffs_base__flicks)(0)),
          0,
          16,
          0,
          false,
          false,
          0);
    }
    self->private_impl.f_call_sequence = 4;

    goto ok;
    ok:
    self->private_impl.p_decode_frame_config[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_frame_config[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 2 : 0;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func nie.decoder.decode_frame

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_nie__decoder__decode_frame(
    wuffs_nie__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__pixel_blend a_blend,
    wuffs_base__slice_u8 a_workbuf,
    wuffs_base__decode_frame_options* a_opts) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_dst || !a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 3)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  wuffs_base__status v_status = wuffs_base__make_status(NULL);

  uint32_t coro_susp_point = self->private_impl.p_decode_frame[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_call_sequence < 4) {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      status = wuffs_nie__decoder__decode_frame_config(self, NULL, a_src);
      if (status.repr) {
        goto suspend;
      }
    } else if (self->private_impl.f_call_sequence == 4) {
    } else {
      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
      goto ok;
    }
    self->private_impl.f_dst_x = 0;
    self->private_impl.f_dst_y = 0;
    v_status = wuffs_base__pixel_swizzler__prepare(&self->private_impl.f_swizzler,
        wuffs_base__pixel_buffer__pixel_format(a_dst),
        wuffs_base__pixel_buffer__palette(a_dst),
        wuffs_base__utility__make_pixel_format(self->private_impl.f_pixfmt),
        wuffs_base__utility__empty_slice_u8(),
        a_blend);
    if ( ! wuffs_base__status__is_ok(&v_status)) {
      status = v_status;
      if (wuffs_base__status__is_error(&status)) {
        goto exit;
      } else if (wuffs_base__status__is_suspension(&status)) {
        status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
        goto exit;
      }
      goto ok;
    }
    while (true) {
      v_status = wuffs_nie__decoder__swizzle(self, a_dst, a_src);
      if (wuffs_base__status__is_ok(&v_status)) {
        goto label__0__break;
      } else if (v_status.repr != wuffs_nie__note__internal_note_short_read) {
        status = v_status;
        if (wuffs_base__status__is_error(&status)) {
          goto exit;
        } else if (wuffs_base__status__is_suspension(&status)) {
          status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
          goto exit;
        }
        goto ok;
      }
      status = wuffs_base__make_status(wuffs_base__suspension__short_read);
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
    }
    label__0__break:;
    self->private_impl.f_call_sequence = 255;

    goto ok;
    ok:
    self->private_impl.p_decode_frame[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_frame[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 3 : 0;

  goto exit;
  exit:
  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func nie.decoder.swizzle

static wuffs_base__status
wuffs_nie__decoder__swizzle(
    wuffs_nie__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  wuffs_base__pixel_format v_dst_pixfmt = {0};
  uint32_t v_dst_bits_per_pixel = 0;
  uint64_t v_dst_bytes_per_pixel = 0;
  uint64_t v_dst_bytes_per_row = 0;
  wuffs_base__table_u8 v_tab = {0};
  wuffs_base__slice_u8 v_dst = {0};
  uint64_t v_i = 0;
  uint64_t v_n = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  v_dst_pixfmt = wuffs_base__pixel_buffer__pixel_format(a_dst);
  v_dst_bits_per_pixel = wuffs_base__pixel_format__bits_per_pixel(&v_dst_pixfmt);
  if ((v_dst_bits_per_pixel & 7) != 0) {
    status = wuffs_base__make_status(wuffs_base__error__unsupported_option);
    goto exit;
  }
  v_dst_bytes_per_pixel = ((uint64_t)((v_dst_bits_per_pixel / 8)));
  v_dst_bytes_per_row = (((uint64_t)(self->private_impl.f_width)) * v_dst_bytes_per_pixel);
  v_tab = wuffs_base__pixel_buffer__plane(a_dst, 0);
  label__0__continue:;
  while (true) {
    if (self->private_impl.f_dst_x == self->private_impl.f_width) {
      self->private_impl.f_dst_x = 0;
      self->private_impl.f_dst_y += 1;
      if (self->private_impl.f_dst_y >= self->private_impl.f_height) {
        goto label__0__break;
      }
    }
    v_dst = wuffs_base__table_u8__row(v_tab, self->private_impl.f_dst_y);
    if (v_dst_bytes_per_row < ((uint64_t)(v_dst.len))) {
      v_dst = wuffs_base__slice_u8__subslice_j(v_dst, v_dst_bytes_per_row);
    }
    v_i = (((uint64_t)(self->private_impl.f_dst_x)) * v_dst_bytes_per_pixel);
    if (v_i >= ((uint64_t)(v_dst.len))) {
      goto label__0__continue;
    }
    v_n = wuffs_base__pixel_swizzler__swizzle_interleaved_from_reader(
        &self->private_impl.f_swizzler,
        wuffs_base__slice_u8__subslice_i(v_dst, v_i),
        wuffs_base__pixel_buffer__palette(a_dst),
        &iop_a_src,
        io2_a_src);
    if (v_n == 0) {
      status = wuffs_base__make_status(wuffs_nie__note__internal_note_short_read);
      goto ok;
    }
    wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x, ((uint32_t)((v_n & 4294967295))));
  }
  label__0__break:;
  status = wuffs_base__make_status(NULL);
  goto ok;

  goto ok;
  ok:
  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func nie.decoder.frame_dirty_rect

WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
wuffs_nie__decoder__frame_dirty_rect(
    const wuffs_nie__decoder* self) {
  if (!self) {
    return wuffs_base__utility__empty_rect_ie_u32();
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__empty_rect_ie_u32();
  }

  return wuffs_base__utility__make_rect_ie_u32(
      0,
      0,
      self->private_impl.f_width,
      self->private_impl.f_height);
}

// -------- func nie.decoder.num_animation_loops

WUFFS_BASE__MAYBE_STATIC uint32_t
wuffs_nie__decoder__num_animation_loops(
    const wuffs_nie__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  return 0;
}

// -------- func nie.decoder.num_decoded_frame_configs

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_nie__decoder__num_decoded_frame_configs(
    const wuffs_nie__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  if (self->private_impl.f_call_sequence > 3) {
    return 1;
  }
  return 0;
}

// -------- func nie.decoder.num_decoded_frames

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_nie__decoder__num_decoded_frames(
    const wuffs_nie__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  if (self->private_impl.f_call_sequence > 4) {
    return 1;
  }
  return 0;
}

// -------- func nie.decoder.restart_frame

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_nie__decoder__restart_frame(
    wuffs_nie__decoder* self,
    uint64_t a_index,
    uint64_t a_io_position) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }

  if (self->private_impl.f_call_sequence < 3) {
    return wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
  }
  if ((a_index != 0) || (a_io_position != 16)) {
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  self->private_impl.f_call_sequence = 3;
  return wuffs_base__make_status(NULL);
}

// -------- func nie.decoder.set_report_metadata

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_nie__decoder__set_report_metadata(
    wuffs_nie__decoder* self,
    uint32_t a_fourcc,
    bool a_report) {
  return wuffs_base__make_empty_struct();
}

// -------- func nie.decoder.tell_me_more

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_nie__decoder__tell_me_more(
    wuffs_nie__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__more_information* a_minfo,
    wuffs_base__io_buffer* a_src) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_dst || !a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 4)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  status = wuffs_base__make_status(wuffs_base__error__no_more_information);
  goto exit;

  goto ok;
  ok:
  goto exit;
  exit:
  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func nie.decoder.workbuf_len

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_nie__decoder__workbuf_len(
    const wuffs_nie__decoder* self) {
  if (!self) {
    return wuffs_base__utility__empty_range_ii_u64();
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__empty_range_ii_u64();
  }

  return wuffs_base__utility__make_range_ii_u64(0, 0);
}

#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__NIE)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__ZLIB)

// ---------------- Status Codes Implementations

const char wuffs_zlib__note__dictionary_required[] = "@zlib: dictionary required";
const char wuffs_zlib__error__bad_checksum[] = "#zlib: bad checksum";
const char wuffs_zlib__error__bad_compression_method[] = "#zlib: bad compression method";
const char wuffs_zlib__error__bad_compression_window_size[] = "#zlib: bad compression window size";
const char wuffs_zlib__error__bad_parity_check[] = "#zlib: bad parity check";
const char wuffs_zlib__error__incorrect_dictionary[] = "#zlib: incorrect dictionary";

// ---------------- Private Consts

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

// ---------------- VTables

const wuffs_base__io_transformer__func_ptrs
wuffs_zlib__decoder__func_ptrs_for__wuffs_base__io_transformer = {
  (wuffs_base__empty_struct(*)(void*,
      uint32_t,
      bool))(&wuffs_zlib__decoder__set_quirk_enabled),
  (wuffs_base__status(*)(void*,
      wuffs_base__io_buffer*,
      wuffs_base__io_buffer*,
      wuffs_base__slice_u8))(&wuffs_zlib__decoder__transform_io),
  (wuffs_base__range_ii_u64(*)(const void*))(&wuffs_zlib__decoder__workbuf_len),
};

// ---------------- Initializer Implementations

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_zlib__decoder__initialize(
    wuffs_zlib__decoder* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options){
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (sizeof(*self) != sizeof_star_self) {
    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
  }
  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
  }

  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
    // The whole point of this if-check is to detect an uninitialized *self.
    // We disable the warning on GCC. Clang-5.0 does not have this warning.
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
    if (self->private_impl.magic != 0) {
      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
    }
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
  } else {
    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    } else {
      memset(&(self->private_impl), 0, sizeof(self->private_impl));
    }
  }

  {
    wuffs_base__status z = wuffs_adler32__hasher__initialize(
        &self->private_data.f_checksum, sizeof(self->private_data.f_checksum), WUFFS_VERSION, options);
    if (z.repr) {
      return z;
    }
  }
  {
    wuffs_base__status z = wuffs_adler32__hasher__initialize(
        &self->private_data.f_dict_id_hasher, sizeof(self->private_data.f_dict_id_hasher), WUFFS_VERSION, options);
    if (z.repr) {
      return z;
    }
  }
  {
    wuffs_base__status z = wuffs_deflate__decoder__initialize(
        &self->private_data.f_flate, sizeof(self->private_data.f_flate), WUFFS_VERSION, options);
    if (z.repr) {
      return z;
    }
  }
  self->private_impl.magic = WUFFS_BASE__MAGIC;
  self->private_impl.vtable_for__wuffs_base__io_transformer.vtable_name =
      wuffs_base__io_transformer__vtable_name;
  self->private_impl.vtable_for__wuffs_base__io_transformer.function_pointers =
      (const void*)(&wuffs_zlib__decoder__func_ptrs_for__wuffs_base__io_transformer);
  return wuffs_base__make_status(NULL);
}

wuffs_zlib__decoder*
wuffs_zlib__decoder__alloc() {
  wuffs_zlib__decoder* x =
      (wuffs_zlib__decoder*)(calloc(sizeof(wuffs_zlib__decoder), 1));
  if (!x) {
    return NULL;
  }
  if (wuffs_zlib__decoder__initialize(
      x, sizeof(wuffs_zlib__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
    free(x);
    return NULL;
  }
  return x;
}

size_t
sizeof__wuffs_zlib__decoder() {
  return sizeof(wuffs_zlib__decoder);
}

// ---------------- Function Implementations

// -------- func zlib.decoder.dictionary_id

WUFFS_BASE__MAYBE_STATIC uint32_t
wuffs_zlib__decoder__dictionary_id(
    const wuffs_zlib__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  return self->private_impl.f_dict_id_want;
}

// -------- func zlib.decoder.add_dictionary

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_zlib__decoder__add_dictionary(
    wuffs_zlib__decoder* self,
    wuffs_base__slice_u8 a_dict) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }

  if (self->private_impl.f_header_complete) {
    self->private_impl.f_bad_call_sequence = true;
  } else {
    self->private_impl.f_dict_id_got = wuffs_adler32__hasher__update_u32(&self->private_data.f_dict_id_hasher, a_dict);
    wuffs_deflate__decoder__add_history(&self->private_data.f_flate, a_dict);
  }
  self->private_impl.f_got_dictionary = true;
  return wuffs_base__make_empty_struct();
}

// -------- func zlib.decoder.set_quirk_enabled

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_zlib__decoder__set_quirk_enabled(
    wuffs_zlib__decoder* self,
    uint32_t a_quirk,
    bool a_enabled) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }

  if (a_quirk == 1) {
    self->private_impl.f_ignore_checksum = a_enabled;
  }
  return wuffs_base__make_empty_struct();
}

// -------- func zlib.decoder.workbuf_len

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_zlib__decoder__workbuf_len(
    const wuffs_zlib__decoder* self) {
  if (!self) {
    return wuffs_base__utility__empty_range_ii_u64();
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__empty_range_ii_u64();
  }

  return wuffs_base__utility__make_range_ii_u64(1, 1);
}

// -------- func zlib.decoder.transform_io

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_zlib__decoder__transform_io(
    wuffs_zlib__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__slice_u8 a_workbuf) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_dst || !a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 1)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint16_t v_x = 0;
  uint32_t v_checksum_got = 0;
  wuffs_base__status v_status = wuffs_base__make_status(NULL);
  uint32_t v_checksum_want = 0;
  uint64_t v_mark = 0;

  uint8_t* iop_a_dst = NULL;
  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_dst) {
    io0_a_dst = a_dst->data.ptr;
    io1_a_dst = io0_a_dst + a_dst->meta.wi;
    iop_a_dst = io1_a_dst;
    io2_a_dst = io0_a_dst + a_dst->data.len;
    if (a_dst->meta.closed) {
      io2_a_dst = iop_a_dst;
    }
  }
  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_transform_io[0];
  if (coro_susp_point) {
    v_checksum_got = self->private_data.s_transform_io[0].v_checksum_got;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_bad_call_sequence) {
      status = wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
      goto exit;
    } else if ( ! self->private_impl.f_want_dictionary) {
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
        uint16_t t_0;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
          t_0 = wuffs_base__peek_u16be__no_bounds_check(iop_a_src);
          iop_a_src += 2;
        } else {
          self->private_data.s_transform_io[0].scratch = 0;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
          while (true) {
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint64_t* scratch = &self->private_data.s_transform_io[0].scratch;
            uint32_t num_bits_0 = ((uint32_t)(*scratch & 0xFF));
            *scratch >>= 8;
            *scratch <<= 8;
            *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_0);
            if (num_bits_0 == 8) {
              t_0 = ((uint16_t)(*scratch >> 48));
              break;
            }
            num_bits_0 += 8;
            *scratch |= ((uint64_t)(num_bits_0));
          }
        }
        v_x = t_0;
      }
      if (((v_x >> 8) & 15) != 8) {
        status = wuffs_base__make_status(wuffs_zlib__error__bad_compression_method);
        goto exit;
      }
      if ((v_x >> 12) > 7) {
        status = wuffs_base__make_status(wuffs_zlib__error__bad_compression_window_size);
        goto exit;
      }
      if ((v_x % 31) != 0) {
        status = wuffs_base__make_status(wuffs_zlib__error__bad_parity_check);
        goto exit;
      }
      self->private_impl.f_want_dictionary = ((v_x & 32) != 0);
      if (self->private_impl.f_want_dictionary) {
        self->private_impl.f_dict_id_got = 1;
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
          uint32_t t_1;
          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
            t_1 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
            iop_a_src += 4;
          } else {
            self->private_data.s_transform_io[0].scratch = 0;
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
            while (true) {
              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                goto suspend;
              }
              uint64_t* scratch = &self->private_data.s_transform_io[0].scratch;
              uint32_t num_bits_1 = ((uint32_t)(*scratch & 0xFF));
              *scratch >>= 8;
              *scratch <<= 8;
              *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_1);
              if (num_bits_1 == 24) {
                t_1 = ((uint32_t)(*scratch >> 32));
                break;
              }
              num_bits_1 += 8;
              *scratch |= ((uint64_t)(num_bits_1));
            }
          }
          self->private_impl.f_dict_id_want = t_1;
        }
        status = wuffs_base__make_status(wuffs_zlib__note__dictionary_required);
        goto ok;
      } else if (self->private_impl.f_got_dictionary) {
        status = wuffs_base__make_status(wuffs_zlib__error__incorrect_dictionary);
        goto exit;
      }
    } else if (self->private_impl.f_dict_id_got != self->private_impl.f_dict_id_want) {
      if (self->private_impl.f_got_dictionary) {
        status = wuffs_base__make_status(wuffs_zlib__error__incorrect_dictionary);
        goto exit;
      }
      status = wuffs_base__make_status(wuffs_zlib__note__dictionary_required);
      goto ok;
    }
    self->private_impl.f_header_complete = true;
    while (true) {
      v_mark = ((uint64_t)(iop_a_dst - io0_a_dst));
      {
        if (a_dst) {
          a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
        }
        if (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        wuffs_base__status t_2 = wuffs_deflate__decoder__transform_io(&self->private_data.f_flate, a_dst, a_src, a_workbuf);
        v_status = t_2;
        if (a_dst) {
          iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
        }
        if (a_src) {
          iop_a_src = a_src->data.ptr + a_src->meta.ri;
        }
      }
      if ( ! self->private_impl.f_ignore_checksum) {
        v_checksum_got = wuffs_adler32__hasher__update_u32(&self->private_data.f_checksum, wuffs_base__io__since(v_mark, ((uint64_t)(iop_a_dst - io0_a_dst)), io0_a_dst));
      }
      if (wuffs_base__status__is_ok(&v_status)) {
        goto label__0__break;
      }
      status = v_status;
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(5);
    }
    label__0__break:;
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
      uint32_t t_3;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
        t_3 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
        iop_a_src += 4;
      } else {
        self->private_data.s_transform_io[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_transform_io[0].scratch;
          uint32_t num_bits_3 = ((uint32_t)(*scratch & 0xFF));
          *scratch >>= 8;
          *scratch <<= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_3);
          if (num_bits_3 == 24) {
            t_3 = ((uint32_t)(*scratch >> 32));
            break;
          }
          num_bits_3 += 8;
          *scratch |= ((uint64_t)(num_bits_3));
        }
      }
      v_checksum_want = t_3;
    }
    if ( ! self->private_impl.f_ignore_checksum && (v_checksum_got != v_checksum_want)) {
      status = wuffs_base__make_status(wuffs_zlib__error__bad_checksum);
      goto exit;
    }

    goto ok;
    ok:
    self->private_impl.p_transform_io[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_transform_io[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 1 : 0;
  self->private_data.s_transform_io[0].v_checksum_got = v_checksum_got;

  goto exit;
  exit:
  if (a_dst) {
    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
  }
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__ZLIB)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__PNG)

// ---------------- Status Codes Implementations

const char wuffs_png__error__bad_checksum[] = "#png: bad checksum";
const char wuffs_png__error__bad_chunk[] = "#png: bad chunk";
const char wuffs_png__error__bad_filter[] = "#png: bad filter";
const char wuffs_png__error__bad_header[] = "#png: bad header";
const char wuffs_png__error__missing_palette[] = "#png: missing palette";
const char wuffs_png__error__unsupported_png_file[] = "#png: unsupported PNG file";
const char wuffs_png__error__internal_error_inconsistent_workbuf_length[] = "#png: internal error: inconsistent workbuf length";
const char wuffs_png__error__internal_error_zlib_decoder_did_not_exhaust_its_input[] = "#png: internal error: zlib decoder did not exhaust its input";

// ---------------- Private Consts

static const uint8_t
WUFFS_PNG__INTERLACING[8][6] WUFFS_BASE__POTENTIALLY_UNUSED = {
  {
    0, 0, 0, 0, 0, 0,
  }, {
    3, 7, 0, 3, 7, 0,
  }, {
    3, 3, 4, 3, 7, 0,
  }, {
    2, 3, 0, 3, 3, 4,
  }, {
    2, 1, 2, 2, 3, 0,
  }, {
    1, 1, 0, 2, 1, 2,
  }, {
    1, 0, 1, 1, 1, 0,
  }, {
    0, 0, 0, 1, 0, 1,
  },
};

static const uint8_t
WUFFS_PNG__LOW_BIT_DEPTH_MULTIPLIERS[8] WUFFS_BASE__POTENTIALLY_UNUSED = {
  0, 255, 85, 0, 17, 0, 0, 0,
};

static const uint8_t
WUFFS_PNG__LOW_BIT_DEPTH_NUM_PACKS[8] WUFFS_BASE__POTENTIALLY_UNUSED = {
  0, 8, 4, 0, 2, 0, 0, 0,
};

static const uint8_t
WUFFS_PNG__NUM_CHANNELS[8] WUFFS_BASE__POTENTIALLY_UNUSED = {
  1, 0, 3, 1, 2, 0, 4, 0,
};

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
static wuffs_base__empty_struct
wuffs_png__decoder__filter_1_distance_4_arm_neon(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr);
#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)

#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
static wuffs_base__empty_struct
wuffs_png__decoder__filter_3_distance_4_arm_neon(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev);
#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)

#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
static wuffs_base__empty_struct
wuffs_png__decoder__filter_4_distance_3_arm_neon(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev);
#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)

#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
static wuffs_base__empty_struct
wuffs_png__decoder__filter_4_distance_4_arm_neon(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev);
#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)

static wuffs_base__empty_struct
wuffs_png__decoder__filter_1(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr);

static wuffs_base__empty_struct
wuffs_png__decoder__filter_1__choosy_default(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr);

static wuffs_base__empty_struct
wuffs_png__decoder__filter_1_distance_3_fallback(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr);

static wuffs_base__empty_struct
wuffs_png__decoder__filter_1_distance_4_fallback(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr);

static wuffs_base__empty_struct
wuffs_png__decoder__filter_2(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev);

static wuffs_base__empty_struct
wuffs_png__decoder__filter_3(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev);

static wuffs_base__empty_struct
wuffs_png__decoder__filter_3__choosy_default(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev);

static wuffs_base__empty_struct
wuffs_png__decoder__filter_3_distance_3_fallback(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev);

static wuffs_base__empty_struct
wuffs_png__decoder__filter_3_distance_4_fallback(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev);

static wuffs_base__empty_struct
wuffs_png__decoder__filter_4(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev);

static wuffs_base__empty_struct
wuffs_png__decoder__filter_4__choosy_default(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev);

static wuffs_base__empty_struct
wuffs_png__decoder__filter_4_distance_3_fallback(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev);

static wuffs_base__empty_struct
wuffs_png__decoder__filter_4_distance_4_fallback(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev);

#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
static wuffs_base__empty_struct
wuffs_png__decoder__filter_1_distance_4_x86_sse42(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr);
#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_64)

#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
static wuffs_base__empty_struct
wuffs_png__decoder__filter_3_distance_4_x86_sse42(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev);
#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_64)

#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
static wuffs_base__empty_struct
wuffs_png__decoder__filter_4_distance_3_x86_sse42(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev);
#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_64)

#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
static wuffs_base__empty_struct
wuffs_png__decoder__filter_4_distance_4_x86_sse42(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev);
#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_64)

static wuffs_base__status
wuffs_png__decoder__decode_ihdr(
    wuffs_png__decoder* self,
    wuffs_base__io_buffer* a_src);

static wuffs_base__empty_struct
wuffs_png__decoder__assign_filter_distance(
    wuffs_png__decoder* self);

static uint64_t
wuffs_png__decoder__calculate_bytes_per_row(
    const wuffs_png__decoder* self,
    uint32_t a_width);

static wuffs_base__empty_struct
wuffs_png__decoder__choose_filter_implementations(
    wuffs_png__decoder* self);

static wuffs_base__status
wuffs_png__decoder__decode_other_chunk(
    wuffs_png__decoder* self,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_png__decoder__decode_plte(
    wuffs_png__decoder* self,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_png__decoder__decode_trns(
    wuffs_png__decoder* self,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status
wuffs_png__decoder__decode_pass(
    wuffs_png__decoder* self,
    wuffs_base__io_buffer* a_src,
    wuffs_base__slice_u8 a_workbuf);

static wuffs_base__status
wuffs_png__decoder__filter_and_swizzle(
    wuffs_png__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__slice_u8 a_workbuf);

static wuffs_base__status
wuffs_png__decoder__filter_and_swizzle__choosy_default(
    wuffs_png__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__slice_u8 a_workbuf);

static wuffs_base__status
wuffs_png__decoder__filter_and_swizzle_tricky(
    wuffs_png__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__slice_u8 a_workbuf);

// ---------------- VTables

const wuffs_base__image_decoder__func_ptrs
wuffs_png__decoder__func_ptrs_for__wuffs_base__image_decoder = {
  (wuffs_base__status(*)(void*,
      wuffs_base__pixel_buffer*,
      wuffs_base__io_buffer*,
      wuffs_base__pixel_blend,
      wuffs_base__slice_u8,
      wuffs_base__decode_frame_options*))(&wuffs_png__decoder__decode_frame),
  (wuffs_base__status(*)(void*,
      wuffs_base__frame_config*,
      wuffs_base__io_buffer*))(&wuffs_png__decoder__decode_frame_config),
  (wuffs_base__status(*)(void*,
      wuffs_base__image_config*,
      wuffs_base__io_buffer*))(&wuffs_png__decoder__decode_image_config),
  (wuffs_base__rect_ie_u32(*)(const void*))(&wuffs_png__decoder__frame_dirty_rect),
  (uint32_t(*)(const void*))(&wuffs_png__decoder__num_animation_loops),
  (uint64_t(*)(const void*))(&wuffs_png__decoder__num_decoded_frame_configs),
  (uint64_t(*)(const void*))(&wuffs_png__decoder__num_decoded_frames),
  (wuffs_base__status(*)(void*,
      uint64_t,
      uint64_t))(&wuffs_png__decoder__restart_frame),
  (wuffs_base__empty_struct(*)(void*,
      uint32_t,
      bool))(&wuffs_png__decoder__set_quirk_enabled),
  (wuffs_base__empty_struct(*)(void*,
      uint32_t,
      bool))(&wuffs_png__decoder__set_report_metadata),
  (wuffs_base__status(*)(void*,
      wuffs_base__io_buffer*,
      wuffs_base__more_information*,
      wuffs_base__io_buffer*))(&wuffs_png__decoder__tell_me_more),
  (wuffs_base__range_ii_u64(*)(const void*))(&wuffs_png__decoder__workbuf_len),
};

// ---------------- Initializer Implementations

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_png__decoder__initialize(
    wuffs_png__decoder* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options){
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (sizeof(*self) != sizeof_star_self) {
    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
  }
  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
  }

  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
    // The whole point of this if-check is to detect an uninitialized *self.
    // We disable the warning on GCC. Clang-5.0 does not have this warning.
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
    if (self->private_impl.magic != 0) {
      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
    }
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
  } else {
    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    } else {
      memset(&(self->private_impl), 0, sizeof(self->private_impl));
    }
  }

  self->private_impl.choosy_filter_1 = &wuffs_png__decoder__filter_1__choosy_default;
  self->private_impl.choosy_filter_3 = &wuffs_png__decoder__filter_3__choosy_default;
  self->private_impl.choosy_filter_4 = &wuffs_png__decoder__filter_4__choosy_default;
  self->private_impl.choosy_filter_and_swizzle = &wuffs_png__decoder__filter_and_swizzle__choosy_default;

  {
    wuffs_base__status z = wuffs_crc32__ieee_hasher__initialize(
        &self->private_data.f_crc32, sizeof(self->private_data.f_crc32), WUFFS_VERSION, options);
    if (z.repr) {
      return z;
    }
  }
  {
    wuffs_base__status z = wuffs_zlib__decoder__initialize(
        &self->private_data.f_zlib, sizeof(self->private_data.f_zlib), WUFFS_VERSION, options);
    if (z.repr) {
      return z;
    }
  }
  self->private_impl.magic = WUFFS_BASE__MAGIC;
  self->private_impl.vtable_for__wuffs_base__image_decoder.vtable_name =
      wuffs_base__image_decoder__vtable_name;
  self->private_impl.vtable_for__wuffs_base__image_decoder.function_pointers =
      (const void*)(&wuffs_png__decoder__func_ptrs_for__wuffs_base__image_decoder);
  return wuffs_base__make_status(NULL);
}

wuffs_png__decoder*
wuffs_png__decoder__alloc() {
  wuffs_png__decoder* x =
      (wuffs_png__decoder*)(calloc(sizeof(wuffs_png__decoder), 1));
  if (!x) {
    return NULL;
  }
  if (wuffs_png__decoder__initialize(
      x, sizeof(wuffs_png__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
    free(x);
    return NULL;
  }
  return x;
}

size_t
sizeof__wuffs_png__decoder() {
  return sizeof(wuffs_png__decoder);
}

// ---------------- Function Implementations

// -------- func png.decoder.filter_1_distance_4_arm_neon

#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
static wuffs_base__empty_struct
wuffs_png__decoder__filter_1_distance_4_arm_neon(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr) {
  wuffs_base__slice_u8 v_curr = {0};
  uint8x8_t v_fa = {0};
  uint8x8_t v_fx = {0};

  {
    wuffs_base__slice_u8 i_slice_curr = a_curr;
    v_curr.ptr = i_slice_curr.ptr;
    v_curr.len = 4;
    uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 8) * 8);
    while (v_curr.ptr < i_end0_curr) {
      v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
      v_fx = vadd_u8(v_fx, v_fa);
      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
      v_fa = v_fx;
      v_curr.ptr += 4;
      v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
      v_fx = vadd_u8(v_fx, v_fa);
      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
      v_fa = v_fx;
      v_curr.ptr += 4;
    }
    v_curr.len = 4;
    uint8_t* i_end1_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
    while (v_curr.ptr < i_end1_curr) {
      v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
      v_fx = vadd_u8(v_fx, v_fa);
      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
      v_fa = v_fx;
      v_curr.ptr += 4;
    }
    v_curr.len = 0;
  }
  return wuffs_base__make_empty_struct();
}
#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)

// -------- func png.decoder.filter_3_distance_4_arm_neon

#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
static wuffs_base__empty_struct
wuffs_png__decoder__filter_3_distance_4_arm_neon(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev) {
  wuffs_base__slice_u8 v_curr = {0};
  wuffs_base__slice_u8 v_prev = {0};
  uint8x8_t v_fa = {0};
  uint8x8_t v_fb = {0};
  uint8x8_t v_fx = {0};

  if (((uint64_t)(a_prev.len)) == 0) {
    {
      wuffs_base__slice_u8 i_slice_curr = a_curr;
      v_curr.ptr = i_slice_curr.ptr;
      v_curr.len = 4;
      uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 8) * 8);
      while (v_curr.ptr < i_end0_curr) {
        v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
        v_fx = vadd_u8(v_fx, vhadd_u8(v_fa, v_fb));
        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
        v_fa = v_fx;
        v_curr.ptr += 4;
        v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
        v_fx = vadd_u8(v_fx, vhadd_u8(v_fa, v_fb));
        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
        v_fa = v_fx;
        v_curr.ptr += 4;
      }
      v_curr.len = 4;
      uint8_t* i_end1_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
      while (v_curr.ptr < i_end1_curr) {
        v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
        v_fx = vadd_u8(v_fx, vhadd_u8(v_fa, v_fb));
        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
        v_fa = v_fx;
        v_curr.ptr += 4;
      }
      v_curr.len = 0;
    }
  } else {
    {
      wuffs_base__slice_u8 i_slice_curr = a_curr;
      v_curr.ptr = i_slice_curr.ptr;
      wuffs_base__slice_u8 i_slice_prev = a_prev;
      v_prev.ptr = i_slice_prev.ptr;
      i_slice_curr.len = ((size_t)(wuffs_base__u64__min(i_slice_curr.len, i_slice_prev.len)));
      v_curr.len = 4;
      v_prev.len = 4;
      uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 8) * 8);
      while (v_curr.ptr < i_end0_curr) {
        v_fb = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
        v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
        v_fx = vadd_u8(v_fx, vhadd_u8(v_fa, v_fb));
        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
        v_fa = v_fx;
        v_curr.ptr += 4;
        v_prev.ptr += 4;
        v_fb = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
        v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
        v_fx = vadd_u8(v_fx, vhadd_u8(v_fa, v_fb));
        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
        v_fa = v_fx;
        v_curr.ptr += 4;
        v_prev.ptr += 4;
      }
      v_curr.len = 4;
      v_prev.len = 4;
      uint8_t* i_end1_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
      while (v_curr.ptr < i_end1_curr) {
        v_fb = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
        v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
        v_fx = vadd_u8(v_fx, vhadd_u8(v_fa, v_fb));
        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
        v_fa = v_fx;
        v_curr.ptr += 4;
        v_prev.ptr += 4;
      }
      v_curr.len = 0;
      v_prev.len = 0;
    }
  }
  return wuffs_base__make_empty_struct();
}
#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)

// -------- func png.decoder.filter_4_distance_3_arm_neon

#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
static wuffs_base__empty_struct
wuffs_png__decoder__filter_4_distance_3_arm_neon(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev) {
  wuffs_base__slice_u8 v_curr = {0};
  wuffs_base__slice_u8 v_prev = {0};
  uint8x8_t v_fa = {0};
  uint8x8_t v_fb = {0};
  uint8x8_t v_fc = {0};
  uint8x8_t v_fx = {0};
  uint16x8_t v_fafb = {0};
  uint16x8_t v_fcfc = {0};
  uint16x8_t v_pa = {0};
  uint16x8_t v_pb = {0};
  uint16x8_t v_pc = {0};
  uint16x8_t v_cmpab = {0};
  uint16x8_t v_cmpac = {0};
  uint8x8_t v_picka = {0};
  uint8x8_t v_pickb = {0};

  {
    wuffs_base__slice_u8 i_slice_curr = a_curr;
    v_curr.ptr = i_slice_curr.ptr;
    wuffs_base__slice_u8 i_slice_prev = a_prev;
    v_prev.ptr = i_slice_prev.ptr;
    i_slice_curr.len = ((size_t)(wuffs_base__u64__min(i_slice_curr.len, i_slice_prev.len)));
    v_curr.len = 4;
    v_prev.len = 4;
    uint8_t* i_end0_curr = v_curr.ptr + wuffs_base__iterate_total_advance((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)), 7, 6);
    while (v_curr.ptr < i_end0_curr) {
      v_fb = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
      v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
      v_fafb = vaddl_u8(v_fa, v_fb);
      v_fcfc = vaddl_u8(v_fc, v_fc);
      v_pa = vabdl_u8(v_fb, v_fc);
      v_pb = vabdl_u8(v_fa, v_fc);
      v_pc = vabdq_u16(v_fafb, v_fcfc);
      v_cmpab = vcleq_u16(v_pa, v_pb);
      v_cmpac = vcleq_u16(v_pa, v_pc);
      v_picka = vmovn_u16(vandq_u16(v_cmpab, v_cmpac));
      v_pickb = vmovn_u16(vcleq_u16(v_pb, v_pc));
      v_fx = vadd_u8(v_fx, vbsl_u8(v_picka, v_fa, vbsl_u8(v_pickb, v_fb, v_fc)));
      wuffs_base__poke_u24le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
      v_fc = v_fb;
      v_fa = v_fx;
      v_curr.ptr += 3;
      v_prev.ptr += 3;
      v_fb = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
      v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
      v_fafb = vaddl_u8(v_fa, v_fb);
      v_fcfc = vaddl_u8(v_fc, v_fc);
      v_pa = vabdl_u8(v_fb, v_fc);
      v_pb = vabdl_u8(v_fa, v_fc);
      v_pc = vabdq_u16(v_fafb, v_fcfc);
      v_cmpab = vcleq_u16(v_pa, v_pb);
      v_cmpac = vcleq_u16(v_pa, v_pc);
      v_picka = vmovn_u16(vandq_u16(v_cmpab, v_cmpac));
      v_pickb = vmovn_u16(vcleq_u16(v_pb, v_pc));
      v_fx = vadd_u8(v_fx, vbsl_u8(v_picka, v_fa, vbsl_u8(v_pickb, v_fb, v_fc)));
      wuffs_base__poke_u24le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
      v_fc = v_fb;
      v_fa = v_fx;
      v_curr.ptr += 3;
      v_prev.ptr += 3;
    }
    v_curr.len = 4;
    v_prev.len = 4;
    uint8_t* i_end1_curr = v_curr.ptr + wuffs_base__iterate_total_advance((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)), 4, 3);
    while (v_curr.ptr < i_end1_curr) {
      v_fb = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
      v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
      v_fafb = vaddl_u8(v_fa, v_fb);
      v_fcfc = vaddl_u8(v_fc, v_fc);
      v_pa = vabdl_u8(v_fb, v_fc);
      v_pb = vabdl_u8(v_fa, v_fc);
      v_pc = vabdq_u16(v_fafb, v_fcfc);
      v_cmpab = vcleq_u16(v_pa, v_pb);
      v_cmpac = vcleq_u16(v_pa, v_pc);
      v_picka = vmovn_u16(vandq_u16(v_cmpab, v_cmpac));
      v_pickb = vmovn_u16(vcleq_u16(v_pb, v_pc));
      v_fx = vadd_u8(v_fx, vbsl_u8(v_picka, v_fa, vbsl_u8(v_pickb, v_fb, v_fc)));
      wuffs_base__poke_u24le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
      v_fc = v_fb;
      v_fa = v_fx;
      v_curr.ptr += 3;
      v_prev.ptr += 3;
    }
    v_curr.len = 3;
    v_prev.len = 3;
    uint8_t* i_end2_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 3) * 3);
    while (v_curr.ptr < i_end2_curr) {
      v_fb = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u24le__no_bounds_check(v_prev.ptr)));
      v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u24le__no_bounds_check(v_curr.ptr)));
      v_fafb = vaddl_u8(v_fa, v_fb);
      v_fcfc = vaddl_u8(v_fc, v_fc);
      v_pa = vabdl_u8(v_fb, v_fc);
      v_pb = vabdl_u8(v_fa, v_fc);
      v_pc = vabdq_u16(v_fafb, v_fcfc);
      v_cmpab = vcleq_u16(v_pa, v_pb);
      v_cmpac = vcleq_u16(v_pa, v_pc);
      v_picka = vmovn_u16(vandq_u16(v_cmpab, v_cmpac));
      v_pickb = vmovn_u16(vcleq_u16(v_pb, v_pc));
      v_fx = vadd_u8(v_fx, vbsl_u8(v_picka, v_fa, vbsl_u8(v_pickb, v_fb, v_fc)));
      wuffs_base__poke_u24le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
      v_curr.ptr += 3;
      v_prev.ptr += 3;
    }
    v_curr.len = 0;
    v_prev.len = 0;
  }
  return wuffs_base__make_empty_struct();
}
#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)

// -------- func png.decoder.filter_4_distance_4_arm_neon

#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
static wuffs_base__empty_struct
wuffs_png__decoder__filter_4_distance_4_arm_neon(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev) {
  wuffs_base__slice_u8 v_curr = {0};
  wuffs_base__slice_u8 v_prev = {0};
  uint8x8_t v_fa = {0};
  uint8x8_t v_fb = {0};
  uint8x8_t v_fc = {0};
  uint8x8_t v_fx = {0};
  uint16x8_t v_fafb = {0};
  uint16x8_t v_fcfc = {0};
  uint16x8_t v_pa = {0};
  uint16x8_t v_pb = {0};
  uint16x8_t v_pc = {0};
  uint16x8_t v_cmpab = {0};
  uint16x8_t v_cmpac = {0};
  uint8x8_t v_picka = {0};
  uint8x8_t v_pickb = {0};

  {
    wuffs_base__slice_u8 i_slice_curr = a_curr;
    v_curr.ptr = i_slice_curr.ptr;
    wuffs_base__slice_u8 i_slice_prev = a_prev;
    v_prev.ptr = i_slice_prev.ptr;
    i_slice_curr.len = ((size_t)(wuffs_base__u64__min(i_slice_curr.len, i_slice_prev.len)));
    v_curr.len = 4;
    v_prev.len = 4;
    uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 8) * 8);
    while (v_curr.ptr < i_end0_curr) {
      v_fb = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
      v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
      v_fafb = vaddl_u8(v_fa, v_fb);
      v_fcfc = vaddl_u8(v_fc, v_fc);
      v_pa = vabdl_u8(v_fb, v_fc);
      v_pb = vabdl_u8(v_fa, v_fc);
      v_pc = vabdq_u16(v_fafb, v_fcfc);
      v_cmpab = vcleq_u16(v_pa, v_pb);
      v_cmpac = vcleq_u16(v_pa, v_pc);
      v_picka = vmovn_u16(vandq_u16(v_cmpab, v_cmpac));
      v_pickb = vmovn_u16(vcleq_u16(v_pb, v_pc));
      v_fx = vadd_u8(v_fx, vbsl_u8(v_picka, v_fa, vbsl_u8(v_pickb, v_fb, v_fc)));
      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
      v_fc = v_fb;
      v_fa = v_fx;
      v_curr.ptr += 4;
      v_prev.ptr += 4;
      v_fb = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
      v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
      v_fafb = vaddl_u8(v_fa, v_fb);
      v_fcfc = vaddl_u8(v_fc, v_fc);
      v_pa = vabdl_u8(v_fb, v_fc);
      v_pb = vabdl_u8(v_fa, v_fc);
      v_pc = vabdq_u16(v_fafb, v_fcfc);
      v_cmpab = vcleq_u16(v_pa, v_pb);
      v_cmpac = vcleq_u16(v_pa, v_pc);
      v_picka = vmovn_u16(vandq_u16(v_cmpab, v_cmpac));
      v_pickb = vmovn_u16(vcleq_u16(v_pb, v_pc));
      v_fx = vadd_u8(v_fx, vbsl_u8(v_picka, v_fa, vbsl_u8(v_pickb, v_fb, v_fc)));
      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
      v_fc = v_fb;
      v_fa = v_fx;
      v_curr.ptr += 4;
      v_prev.ptr += 4;
    }
    v_curr.len = 4;
    v_prev.len = 4;
    uint8_t* i_end1_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
    while (v_curr.ptr < i_end1_curr) {
      v_fb = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
      v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
      v_fafb = vaddl_u8(v_fa, v_fb);
      v_fcfc = vaddl_u8(v_fc, v_fc);
      v_pa = vabdl_u8(v_fb, v_fc);
      v_pb = vabdl_u8(v_fa, v_fc);
      v_pc = vabdq_u16(v_fafb, v_fcfc);
      v_cmpab = vcleq_u16(v_pa, v_pb);
      v_cmpac = vcleq_u16(v_pa, v_pc);
      v_picka = vmovn_u16(vandq_u16(v_cmpab, v_cmpac));
      v_pickb = vmovn_u16(vcleq_u16(v_pb, v_pc));
      v_fx = vadd_u8(v_fx, vbsl_u8(v_picka, v_fa, vbsl_u8(v_pickb, v_fb, v_fc)));
      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
      v_fc = v_fb;
      v_fa = v_fx;
      v_curr.ptr += 4;
      v_prev.ptr += 4;
    }
    v_curr.len = 0;
    v_prev.len = 0;
  }
  return wuffs_base__make_empty_struct();
}
#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)

// -------- func png.decoder.filter_1

static wuffs_base__empty_struct
wuffs_png__decoder__filter_1(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr) {
  return (*self->private_impl.choosy_filter_1)(self, a_curr);
}

static wuffs_base__empty_struct
wuffs_png__decoder__filter_1__choosy_default(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr) {
  uint64_t v_filter_distance = 0;
  uint8_t v_fa = 0;
  uint64_t v_i_start = 0;
  uint64_t v_i = 0;

  v_filter_distance = ((uint64_t)(self->private_impl.f_filter_distance));
  v_i_start = 0;
  while (v_i_start < v_filter_distance) {
    v_fa = 0;
    v_i = v_i_start;
    while (v_i < ((uint64_t)(a_curr.len))) {
      a_curr.ptr[v_i] = ((uint8_t)(a_curr.ptr[v_i] + v_fa));
      v_fa = a_curr.ptr[v_i];
      v_i += v_filter_distance;
    }
    v_i_start += 1;
  }
  return wuffs_base__make_empty_struct();
}

// -------- func png.decoder.filter_1_distance_3_fallback

static wuffs_base__empty_struct
wuffs_png__decoder__filter_1_distance_3_fallback(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr) {
  wuffs_base__slice_u8 v_curr = {0};
  uint8_t v_fa0 = 0;
  uint8_t v_fa1 = 0;
  uint8_t v_fa2 = 0;

  {
    wuffs_base__slice_u8 i_slice_curr = a_curr;
    v_curr.ptr = i_slice_curr.ptr;
    v_curr.len = 3;
    uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 6) * 6);
    while (v_curr.ptr < i_end0_curr) {
      v_fa0 = ((uint8_t)(v_fa0 + v_curr.ptr[0]));
      v_curr.ptr[0] = v_fa0;
      v_fa1 = ((uint8_t)(v_fa1 + v_curr.ptr[1]));
      v_curr.ptr[1] = v_fa1;
      v_fa2 = ((uint8_t)(v_fa2 + v_curr.ptr[2]));
      v_curr.ptr[2] = v_fa2;
      v_curr.ptr += 3;
      v_fa0 = ((uint8_t)(v_fa0 + v_curr.ptr[0]));
      v_curr.ptr[0] = v_fa0;
      v_fa1 = ((uint8_t)(v_fa1 + v_curr.ptr[1]));
      v_curr.ptr[1] = v_fa1;
      v_fa2 = ((uint8_t)(v_fa2 + v_curr.ptr[2]));
      v_curr.ptr[2] = v_fa2;
      v_curr.ptr += 3;
    }
    v_curr.len = 3;
    uint8_t* i_end1_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 3) * 3);
    while (v_curr.ptr < i_end1_curr) {
      v_fa0 = ((uint8_t)(v_fa0 + v_curr.ptr[0]));
      v_curr.ptr[0] = v_fa0;
      v_fa1 = ((uint8_t)(v_fa1 + v_curr.ptr[1]));
      v_curr.ptr[1] = v_fa1;
      v_fa2 = ((uint8_t)(v_fa2 + v_curr.ptr[2]));
      v_curr.ptr[2] = v_fa2;
      v_curr.ptr += 3;
    }
    v_curr.len = 0;
  }
  return wuffs_base__make_empty_struct();
}

// -------- func png.decoder.filter_1_distance_4_fallback

static wuffs_base__empty_struct
wuffs_png__decoder__filter_1_distance_4_fallback(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr) {
  wuffs_base__slice_u8 v_curr = {0};
  uint8_t v_fa0 = 0;
  uint8_t v_fa1 = 0;
  uint8_t v_fa2 = 0;
  uint8_t v_fa3 = 0;

  {
    wuffs_base__slice_u8 i_slice_curr = a_curr;
    v_curr.ptr = i_slice_curr.ptr;
    v_curr.len = 4;
    uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
    while (v_curr.ptr < i_end0_curr) {
      v_fa0 = ((uint8_t)(v_fa0 + v_curr.ptr[0]));
      v_curr.ptr[0] = v_fa0;
      v_fa1 = ((uint8_t)(v_fa1 + v_curr.ptr[1]));
      v_curr.ptr[1] = v_fa1;
      v_fa2 = ((uint8_t)(v_fa2 + v_curr.ptr[2]));
      v_curr.ptr[2] = v_fa2;
      v_fa3 = ((uint8_t)(v_fa3 + v_curr.ptr[3]));
      v_curr.ptr[3] = v_fa3;
      v_curr.ptr += 4;
    }
    v_curr.len = 0;
  }
  return wuffs_base__make_empty_struct();
}

// -------- func png.decoder.filter_2

static wuffs_base__empty_struct
wuffs_png__decoder__filter_2(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev) {
  uint64_t v_n = 0;
  uint64_t v_i = 0;

  v_n = wuffs_base__u64__min(((uint64_t)(a_curr.len)), ((uint64_t)(a_prev.len)));
  v_i = 0;
  while (v_i < v_n) {
    a_curr.ptr[v_i] = ((uint8_t)(a_curr.ptr[v_i] + a_prev.ptr[v_i]));
    v_i += 1;
  }
  return wuffs_base__make_empty_struct();
}

// -------- func png.decoder.filter_3

static wuffs_base__empty_struct
wuffs_png__decoder__filter_3(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev) {
  return (*self->private_impl.choosy_filter_3)(self, a_curr, a_prev);
}

static wuffs_base__empty_struct
wuffs_png__decoder__filter_3__choosy_default(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev) {
  uint64_t v_filter_distance = 0;
  uint64_t v_n = 0;
  uint64_t v_i = 0;

  v_filter_distance = ((uint64_t)(self->private_impl.f_filter_distance));
  if (((uint64_t)(a_prev.len)) == 0) {
    v_i = v_filter_distance;
    while (v_i < ((uint64_t)(a_curr.len))) {
      a_curr.ptr[v_i] = ((uint8_t)(a_curr.ptr[v_i] + (a_curr.ptr[(v_i - v_filter_distance)] / 2)));
      v_i += 1;
    }
  } else {
    v_n = wuffs_base__u64__min(((uint64_t)(a_curr.len)), ((uint64_t)(a_prev.len)));
    v_i = 0;
    while ((v_i < v_n) && (v_i < v_filter_distance)) {
      a_curr.ptr[v_i] = ((uint8_t)(a_curr.ptr[v_i] + (a_prev.ptr[v_i] / 2)));
      v_i += 1;
    }
    v_i = v_filter_distance;
    while (v_i < v_n) {
      a_curr.ptr[v_i] = ((uint8_t)(a_curr.ptr[v_i] + ((uint8_t)(((((uint32_t)(a_curr.ptr[(v_i - v_filter_distance)])) + ((uint32_t)(a_prev.ptr[v_i]))) / 2)))));
      v_i += 1;
    }
  }
  return wuffs_base__make_empty_struct();
}

// -------- func png.decoder.filter_3_distance_3_fallback

static wuffs_base__empty_struct
wuffs_png__decoder__filter_3_distance_3_fallback(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev) {
  wuffs_base__slice_u8 v_curr = {0};
  wuffs_base__slice_u8 v_prev = {0};
  uint8_t v_fa0 = 0;
  uint8_t v_fa1 = 0;
  uint8_t v_fa2 = 0;

  if (((uint64_t)(a_prev.len)) == 0) {
    {
      wuffs_base__slice_u8 i_slice_curr = a_curr;
      v_curr.ptr = i_slice_curr.ptr;
      v_curr.len = 3;
      uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 6) * 6);
      while (v_curr.ptr < i_end0_curr) {
        v_fa0 = ((uint8_t)((v_fa0 / 2) + v_curr.ptr[0]));
        v_curr.ptr[0] = v_fa0;
        v_fa1 = ((uint8_t)((v_fa1 / 2) + v_curr.ptr[1]));
        v_curr.ptr[1] = v_fa1;
        v_fa2 = ((uint8_t)((v_fa2 / 2) + v_curr.ptr[2]));
        v_curr.ptr[2] = v_fa2;
        v_curr.ptr += 3;
        v_fa0 = ((uint8_t)((v_fa0 / 2) + v_curr.ptr[0]));
        v_curr.ptr[0] = v_fa0;
        v_fa1 = ((uint8_t)((v_fa1 / 2) + v_curr.ptr[1]));
        v_curr.ptr[1] = v_fa1;
        v_fa2 = ((uint8_t)((v_fa2 / 2) + v_curr.ptr[2]));
        v_curr.ptr[2] = v_fa2;
        v_curr.ptr += 3;
      }
      v_curr.len = 3;
      uint8_t* i_end1_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 3) * 3);
      while (v_curr.ptr < i_end1_curr) {
        v_fa0 = ((uint8_t)((v_fa0 / 2) + v_curr.ptr[0]));
        v_curr.ptr[0] = v_fa0;
        v_fa1 = ((uint8_t)((v_fa1 / 2) + v_curr.ptr[1]));
        v_curr.ptr[1] = v_fa1;
        v_fa2 = ((uint8_t)((v_fa2 / 2) + v_curr.ptr[2]));
        v_curr.ptr[2] = v_fa2;
        v_curr.ptr += 3;
      }
      v_curr.len = 0;
    }
  } else {
    {
      wuffs_base__slice_u8 i_slice_curr = a_curr;
      v_curr.ptr = i_slice_curr.ptr;
      wuffs_base__slice_u8 i_slice_prev = a_prev;
      v_prev.ptr = i_slice_prev.ptr;
      i_slice_curr.len = ((size_t)(wuffs_base__u64__min(i_slice_curr.len, i_slice_prev.len)));
      v_curr.len = 3;
      v_prev.len = 3;
      uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 6) * 6);
      while (v_curr.ptr < i_end0_curr) {
        v_fa0 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa0)) + ((uint32_t)(v_prev.ptr[0]))) / 2))) + v_curr.ptr[0]));
        v_curr.ptr[0] = v_fa0;
        v_fa1 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa1)) + ((uint32_t)(v_prev.ptr[1]))) / 2))) + v_curr.ptr[1]));
        v_curr.ptr[1] = v_fa1;
        v_fa2 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa2)) + ((uint32_t)(v_prev.ptr[2]))) / 2))) + v_curr.ptr[2]));
        v_curr.ptr[2] = v_fa2;
        v_curr.ptr += 3;
        v_prev.ptr += 3;
        v_fa0 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa0)) + ((uint32_t)(v_prev.ptr[0]))) / 2))) + v_curr.ptr[0]));
        v_curr.ptr[0] = v_fa0;
        v_fa1 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa1)) + ((uint32_t)(v_prev.ptr[1]))) / 2))) + v_curr.ptr[1]));
        v_curr.ptr[1] = v_fa1;
        v_fa2 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa2)) + ((uint32_t)(v_prev.ptr[2]))) / 2))) + v_curr.ptr[2]));
        v_curr.ptr[2] = v_fa2;
        v_curr.ptr += 3;
        v_prev.ptr += 3;
      }
      v_curr.len = 3;
      v_prev.len = 3;
      uint8_t* i_end1_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 3) * 3);
      while (v_curr.ptr < i_end1_curr) {
        v_fa0 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa0)) + ((uint32_t)(v_prev.ptr[0]))) / 2))) + v_curr.ptr[0]));
        v_curr.ptr[0] = v_fa0;
        v_fa1 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa1)) + ((uint32_t)(v_prev.ptr[1]))) / 2))) + v_curr.ptr[1]));
        v_curr.ptr[1] = v_fa1;
        v_fa2 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa2)) + ((uint32_t)(v_prev.ptr[2]))) / 2))) + v_curr.ptr[2]));
        v_curr.ptr[2] = v_fa2;
        v_curr.ptr += 3;
        v_prev.ptr += 3;
      }
      v_curr.len = 0;
      v_prev.len = 0;
    }
  }
  return wuffs_base__make_empty_struct();
}

// -------- func png.decoder.filter_3_distance_4_fallback

static wuffs_base__empty_struct
wuffs_png__decoder__filter_3_distance_4_fallback(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev) {
  wuffs_base__slice_u8 v_curr = {0};
  wuffs_base__slice_u8 v_prev = {0};
  uint8_t v_fa0 = 0;
  uint8_t v_fa1 = 0;
  uint8_t v_fa2 = 0;
  uint8_t v_fa3 = 0;

  if (((uint64_t)(a_prev.len)) == 0) {
    {
      wuffs_base__slice_u8 i_slice_curr = a_curr;
      v_curr.ptr = i_slice_curr.ptr;
      v_curr.len = 4;
      uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
      while (v_curr.ptr < i_end0_curr) {
        v_fa0 = ((uint8_t)((v_fa0 / 2) + v_curr.ptr[0]));
        v_curr.ptr[0] = v_fa0;
        v_fa1 = ((uint8_t)((v_fa1 / 2) + v_curr.ptr[1]));
        v_curr.ptr[1] = v_fa1;
        v_fa2 = ((uint8_t)((v_fa2 / 2) + v_curr.ptr[2]));
        v_curr.ptr[2] = v_fa2;
        v_fa3 = ((uint8_t)((v_fa3 / 2) + v_curr.ptr[3]));
        v_curr.ptr[3] = v_fa3;
        v_curr.ptr += 4;
      }
      v_curr.len = 0;
    }
  } else {
    {
      wuffs_base__slice_u8 i_slice_curr = a_curr;
      v_curr.ptr = i_slice_curr.ptr;
      wuffs_base__slice_u8 i_slice_prev = a_prev;
      v_prev.ptr = i_slice_prev.ptr;
      i_slice_curr.len = ((size_t)(wuffs_base__u64__min(i_slice_curr.len, i_slice_prev.len)));
      v_curr.len = 4;
      v_prev.len = 4;
      uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
      while (v_curr.ptr < i_end0_curr) {
        v_fa0 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa0)) + ((uint32_t)(v_prev.ptr[0]))) / 2))) + v_curr.ptr[0]));
        v_curr.ptr[0] = v_fa0;
        v_fa1 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa1)) + ((uint32_t)(v_prev.ptr[1]))) / 2))) + v_curr.ptr[1]));
        v_curr.ptr[1] = v_fa1;
        v_fa2 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa2)) + ((uint32_t)(v_prev.ptr[2]))) / 2))) + v_curr.ptr[2]));
        v_curr.ptr[2] = v_fa2;
        v_fa3 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa3)) + ((uint32_t)(v_prev.ptr[3]))) / 2))) + v_curr.ptr[3]));
        v_curr.ptr[3] = v_fa3;
        v_curr.ptr += 4;
        v_prev.ptr += 4;
      }
      v_curr.len = 0;
      v_prev.len = 0;
    }
  }
  return wuffs_base__make_empty_struct();
}

// -------- func png.decoder.filter_4

static wuffs_base__empty_struct
wuffs_png__decoder__filter_4(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev) {
  return (*self->private_impl.choosy_filter_4)(self, a_curr, a_prev);
}

static wuffs_base__empty_struct
wuffs_png__decoder__filter_4__choosy_default(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev) {
  uint64_t v_filter_distance = 0;
  uint64_t v_n = 0;
  uint64_t v_i = 0;
  uint32_t v_fa = 0;
  uint32_t v_fb = 0;
  uint32_t v_fc = 0;
  uint32_t v_pp = 0;
  uint32_t v_pa = 0;
  uint32_t v_pb = 0;
  uint32_t v_pc = 0;

  v_filter_distance = ((uint64_t)(self->private_impl.f_filter_distance));
  v_n = wuffs_base__u64__min(((uint64_t)(a_curr.len)), ((uint64_t)(a_prev.len)));
  v_i = 0;
  while ((v_i < v_n) && (v_i < v_filter_distance)) {
    a_curr.ptr[v_i] = ((uint8_t)(a_curr.ptr[v_i] + a_prev.ptr[v_i]));
    v_i += 1;
  }
  v_i = v_filter_distance;
  while (v_i < v_n) {
    v_fa = ((uint32_t)(a_curr.ptr[(v_i - v_filter_distance)]));
    v_fb = ((uint32_t)(a_prev.ptr[v_i]));
    v_fc = ((uint32_t)(a_prev.ptr[(v_i - v_filter_distance)]));
    v_pp = ((uint32_t)(((uint32_t)(v_fa + v_fb)) - v_fc));
    v_pa = ((uint32_t)(v_pp - v_fa));
    if (v_pa >= 2147483648) {
      v_pa = ((uint32_t)(0 - v_pa));
    }
    v_pb = ((uint32_t)(v_pp - v_fb));
    if (v_pb >= 2147483648) {
      v_pb = ((uint32_t)(0 - v_pb));
    }
    v_pc = ((uint32_t)(v_pp - v_fc));
    if (v_pc >= 2147483648) {
      v_pc = ((uint32_t)(0 - v_pc));
    }
    if ((v_pa <= v_pb) && (v_pa <= v_pc)) {
    } else if (v_pb <= v_pc) {
      v_fa = v_fb;
    } else {
      v_fa = v_fc;
    }
    a_curr.ptr[v_i] = ((uint8_t)(a_curr.ptr[v_i] + ((uint8_t)((v_fa & 255)))));
    v_i += 1;
  }
  return wuffs_base__make_empty_struct();
}

// -------- func png.decoder.filter_4_distance_3_fallback

static wuffs_base__empty_struct
wuffs_png__decoder__filter_4_distance_3_fallback(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev) {
  wuffs_base__slice_u8 v_curr = {0};
  wuffs_base__slice_u8 v_prev = {0};
  uint32_t v_fa0 = 0;
  uint32_t v_fa1 = 0;
  uint32_t v_fa2 = 0;
  uint32_t v_fb0 = 0;
  uint32_t v_fb1 = 0;
  uint32_t v_fb2 = 0;
  uint32_t v_fc0 = 0;
  uint32_t v_fc1 = 0;
  uint32_t v_fc2 = 0;
  uint32_t v_pp0 = 0;
  uint32_t v_pp1 = 0;
  uint32_t v_pp2 = 0;
  uint32_t v_pa0 = 0;
  uint32_t v_pa1 = 0;
  uint32_t v_pa2 = 0;
  uint32_t v_pb0 = 0;
  uint32_t v_pb1 = 0;
  uint32_t v_pb2 = 0;
  uint32_t v_pc0 = 0;
  uint32_t v_pc1 = 0;
  uint32_t v_pc2 = 0;

  {
    wuffs_base__slice_u8 i_slice_curr = a_curr;
    v_curr.ptr = i_slice_curr.ptr;
    wuffs_base__slice_u8 i_slice_prev = a_prev;
    v_prev.ptr = i_slice_prev.ptr;
    i_slice_curr.len = ((size_t)(wuffs_base__u64__min(i_slice_curr.len, i_slice_prev.len)));
    v_curr.len = 3;
    v_prev.len = 3;
    uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 3) * 3);
    while (v_curr.ptr < i_end0_curr) {
      v_fb0 = ((uint32_t)(v_prev.ptr[0]));
      v_pp0 = ((uint32_t)(((uint32_t)(v_fa0 + v_fb0)) - v_fc0));
      v_pa0 = ((uint32_t)(v_pp0 - v_fa0));
      if (v_pa0 >= 2147483648) {
        v_pa0 = ((uint32_t)(0 - v_pa0));
      }
      v_pb0 = ((uint32_t)(v_pp0 - v_fb0));
      if (v_pb0 >= 2147483648) {
        v_pb0 = ((uint32_t)(0 - v_pb0));
      }
      v_pc0 = ((uint32_t)(v_pp0 - v_fc0));
      if (v_pc0 >= 2147483648) {
        v_pc0 = ((uint32_t)(0 - v_pc0));
      }
      if ((v_pa0 <= v_pb0) && (v_pa0 <= v_pc0)) {
      } else if (v_pb0 <= v_pc0) {
        v_fa0 = v_fb0;
      } else {
        v_fa0 = v_fc0;
      }
      v_curr.ptr[0] = ((uint8_t)(v_curr.ptr[0] + ((uint8_t)((v_fa0 & 255)))));
      v_fa0 = ((uint32_t)(v_curr.ptr[0]));
      v_fc0 = v_fb0;
      v_fb1 = ((uint32_t)(v_prev.ptr[1]));
      v_pp1 = ((uint32_t)(((uint32_t)(v_fa1 + v_fb1)) - v_fc1));
      v_pa1 = ((uint32_t)(v_pp1 - v_fa1));
      if (v_pa1 >= 2147483648) {
        v_pa1 = ((uint32_t)(0 - v_pa1));
      }
      v_pb1 = ((uint32_t)(v_pp1 - v_fb1));
      if (v_pb1 >= 2147483648) {
        v_pb1 = ((uint32_t)(0 - v_pb1));
      }
      v_pc1 = ((uint32_t)(v_pp1 - v_fc1));
      if (v_pc1 >= 2147483648) {
        v_pc1 = ((uint32_t)(0 - v_pc1));
      }
      if ((v_pa1 <= v_pb1) && (v_pa1 <= v_pc1)) {
      } else if (v_pb1 <= v_pc1) {
        v_fa1 = v_fb1;
      } else {
        v_fa1 = v_fc1;
      }
      v_curr.ptr[1] = ((uint8_t)(v_curr.ptr[1] + ((uint8_t)((v_fa1 & 255)))));
      v_fa1 = ((uint32_t)(v_curr.ptr[1]));
      v_fc1 = v_fb1;
      v_fb2 = ((uint32_t)(v_prev.ptr[2]));
      v_pp2 = ((uint32_t)(((uint32_t)(v_fa2 + v_fb2)) - v_fc2));
      v_pa2 = ((uint32_t)(v_pp2 - v_fa2));
      if (v_pa2 >= 2147483648) {
        v_pa2 = ((uint32_t)(0 - v_pa2));
      }
      v_pb2 = ((uint32_t)(v_pp2 - v_fb2));
      if (v_pb2 >= 2147483648) {
        v_pb2 = ((uint32_t)(0 - v_pb2));
      }
      v_pc2 = ((uint32_t)(v_pp2 - v_fc2));
      if (v_pc2 >= 2147483648) {
        v_pc2 = ((uint32_t)(0 - v_pc2));
      }
      if ((v_pa2 <= v_pb2) && (v_pa2 <= v_pc2)) {
      } else if (v_pb2 <= v_pc2) {
        v_fa2 = v_fb2;
      } else {
        v_fa2 = v_fc2;
      }
      v_curr.ptr[2] = ((uint8_t)(v_curr.ptr[2] + ((uint8_t)((v_fa2 & 255)))));
      v_fa2 = ((uint32_t)(v_curr.ptr[2]));
      v_fc2 = v_fb2;
      v_curr.ptr += 3;
      v_prev.ptr += 3;
    }
    v_curr.len = 0;
    v_prev.len = 0;
  }
  return wuffs_base__make_empty_struct();
}

// -------- func png.decoder.filter_4_distance_4_fallback

static wuffs_base__empty_struct
wuffs_png__decoder__filter_4_distance_4_fallback(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev) {
  wuffs_base__slice_u8 v_curr = {0};
  wuffs_base__slice_u8 v_prev = {0};
  uint32_t v_fa0 = 0;
  uint32_t v_fa1 = 0;
  uint32_t v_fa2 = 0;
  uint32_t v_fa3 = 0;
  uint32_t v_fb0 = 0;
  uint32_t v_fb1 = 0;
  uint32_t v_fb2 = 0;
  uint32_t v_fb3 = 0;
  uint32_t v_fc0 = 0;
  uint32_t v_fc1 = 0;
  uint32_t v_fc2 = 0;
  uint32_t v_fc3 = 0;
  uint32_t v_pp0 = 0;
  uint32_t v_pp1 = 0;
  uint32_t v_pp2 = 0;
  uint32_t v_pp3 = 0;
  uint32_t v_pa0 = 0;
  uint32_t v_pa1 = 0;
  uint32_t v_pa2 = 0;
  uint32_t v_pa3 = 0;
  uint32_t v_pb0 = 0;
  uint32_t v_pb1 = 0;
  uint32_t v_pb2 = 0;
  uint32_t v_pb3 = 0;
  uint32_t v_pc0 = 0;
  uint32_t v_pc1 = 0;
  uint32_t v_pc2 = 0;
  uint32_t v_pc3 = 0;

  {
    wuffs_base__slice_u8 i_slice_curr = a_curr;
    v_curr.ptr = i_slice_curr.ptr;
    wuffs_base__slice_u8 i_slice_prev = a_prev;
    v_prev.ptr = i_slice_prev.ptr;
    i_slice_curr.len = ((size_t)(wuffs_base__u64__min(i_slice_curr.len, i_slice_prev.len)));
    v_curr.len = 4;
    v_prev.len = 4;
    uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
    while (v_curr.ptr < i_end0_curr) {
      v_fb0 = ((uint32_t)(v_prev.ptr[0]));
      v_pp0 = ((uint32_t)(((uint32_t)(v_fa0 + v_fb0)) - v_fc0));
      v_pa0 = ((uint32_t)(v_pp0 - v_fa0));
      if (v_pa0 >= 2147483648) {
        v_pa0 = ((uint32_t)(0 - v_pa0));
      }
      v_pb0 = ((uint32_t)(v_pp0 - v_fb0));
      if (v_pb0 >= 2147483648) {
        v_pb0 = ((uint32_t)(0 - v_pb0));
      }
      v_pc0 = ((uint32_t)(v_pp0 - v_fc0));
      if (v_pc0 >= 2147483648) {
        v_pc0 = ((uint32_t)(0 - v_pc0));
      }
      if ((v_pa0 <= v_pb0) && (v_pa0 <= v_pc0)) {
      } else if (v_pb0 <= v_pc0) {
        v_fa0 = v_fb0;
      } else {
        v_fa0 = v_fc0;
      }
      v_curr.ptr[0] = ((uint8_t)(v_curr.ptr[0] + ((uint8_t)((v_fa0 & 255)))));
      v_fa0 = ((uint32_t)(v_curr.ptr[0]));
      v_fc0 = v_fb0;
      v_fb1 = ((uint32_t)(v_prev.ptr[1]));
      v_pp1 = ((uint32_t)(((uint32_t)(v_fa1 + v_fb1)) - v_fc1));
      v_pa1 = ((uint32_t)(v_pp1 - v_fa1));
      if (v_pa1 >= 2147483648) {
        v_pa1 = ((uint32_t)(0 - v_pa1));
      }
      v_pb1 = ((uint32_t)(v_pp1 - v_fb1));
      if (v_pb1 >= 2147483648) {
        v_pb1 = ((uint32_t)(0 - v_pb1));
      }
      v_pc1 = ((uint32_t)(v_pp1 - v_fc1));
      if (v_pc1 >= 2147483648) {
        v_pc1 = ((uint32_t)(0 - v_pc1));
      }
      if ((v_pa1 <= v_pb1) && (v_pa1 <= v_pc1)) {
      } else if (v_pb1 <= v_pc1) {
        v_fa1 = v_fb1;
      } else {
        v_fa1 = v_fc1;
      }
      v_curr.ptr[1] = ((uint8_t)(v_curr.ptr[1] + ((uint8_t)((v_fa1 & 255)))));
      v_fa1 = ((uint32_t)(v_curr.ptr[1]));
      v_fc1 = v_fb1;
      v_fb2 = ((uint32_t)(v_prev.ptr[2]));
      v_pp2 = ((uint32_t)(((uint32_t)(v_fa2 + v_fb2)) - v_fc2));
      v_pa2 = ((uint32_t)(v_pp2 - v_fa2));
      if (v_pa2 >= 2147483648) {
        v_pa2 = ((uint32_t)(0 - v_pa2));
      }
      v_pb2 = ((uint32_t)(v_pp2 - v_fb2));
      if (v_pb2 >= 2147483648) {
        v_pb2 = ((uint32_t)(0 - v_pb2));
      }
      v_pc2 = ((uint32_t)(v_pp2 - v_fc2));
      if (v_pc2 >= 2147483648) {
        v_pc2 = ((uint32_t)(0 - v_pc2));
      }
      if ((v_pa2 <= v_pb2) && (v_pa2 <= v_pc2)) {
      } else if (v_pb2 <= v_pc2) {
        v_fa2 = v_fb2;
      } else {
        v_fa2 = v_fc2;
      }
      v_curr.ptr[2] = ((uint8_t)(v_curr.ptr[2] + ((uint8_t)((v_fa2 & 255)))));
      v_fa2 = ((uint32_t)(v_curr.ptr[2]));
      v_fc2 = v_fb2;
      v_fb3 = ((uint32_t)(v_prev.ptr[3]));
      v_pp3 = ((uint32_t)(((uint32_t)(v_fa3 + v_fb3)) - v_fc3));
      v_pa3 = ((uint32_t)(v_pp3 - v_fa3));
      if (v_pa3 >= 2147483648) {
        v_pa3 = ((uint32_t)(0 - v_pa3));
      }
      v_pb3 = ((uint32_t)(v_pp3 - v_fb3));
      if (v_pb3 >= 2147483648) {
        v_pb3 = ((uint32_t)(0 - v_pb3));
      }
      v_pc3 = ((uint32_t)(v_pp3 - v_fc3));
      if (v_pc3 >= 2147483648) {
        v_pc3 = ((uint32_t)(0 - v_pc3));
      }
      if ((v_pa3 <= v_pb3) && (v_pa3 <= v_pc3)) {
      } else if (v_pb3 <= v_pc3) {
        v_fa3 = v_fb3;
      } else {
        v_fa3 = v_fc3;
      }
      v_curr.ptr[3] = ((uint8_t)(v_curr.ptr[3] + ((uint8_t)((v_fa3 & 255)))));
      v_fa3 = ((uint32_t)(v_curr.ptr[3]));
      v_fc3 = v_fb3;
      v_curr.ptr += 4;
      v_prev.ptr += 4;
    }
    v_curr.len = 0;
    v_prev.len = 0;
  }
  return wuffs_base__make_empty_struct();
}

// -------- func png.decoder.filter_1_distance_4_x86_sse42

#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
#if defined(__GNUC__)
__attribute__((target("pclmul,popcnt,sse4.2")))
#endif
static wuffs_base__empty_struct
wuffs_png__decoder__filter_1_distance_4_x86_sse42(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr) {
  wuffs_base__slice_u8 v_curr = {0};
  __m128i v_x128 = {0};
  __m128i v_a128 = {0};

  {
    wuffs_base__slice_u8 i_slice_curr = a_curr;
    v_curr.ptr = i_slice_curr.ptr;
    v_curr.len = 4;
    uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 8) * 8);
    while (v_curr.ptr < i_end0_curr) {
      v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
      v_x128 = _mm_add_epi8(v_x128, v_a128);
      v_a128 = v_x128;
      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
      v_curr.ptr += 4;
      v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
      v_x128 = _mm_add_epi8(v_x128, v_a128);
      v_a128 = v_x128;
      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
      v_curr.ptr += 4;
    }
    v_curr.len = 4;
    uint8_t* i_end1_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
    while (v_curr.ptr < i_end1_curr) {
      v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
      v_x128 = _mm_add_epi8(v_x128, v_a128);
      v_a128 = v_x128;
      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
      v_curr.ptr += 4;
    }
    v_curr.len = 0;
  }
  return wuffs_base__make_empty_struct();
}
#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_64)

// -------- func png.decoder.filter_3_distance_4_x86_sse42

#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
#if defined(__GNUC__)
__attribute__((target("pclmul,popcnt,sse4.2")))
#endif
static wuffs_base__empty_struct
wuffs_png__decoder__filter_3_distance_4_x86_sse42(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev) {
  wuffs_base__slice_u8 v_curr = {0};
  wuffs_base__slice_u8 v_prev = {0};
  __m128i v_x128 = {0};
  __m128i v_a128 = {0};
  __m128i v_b128 = {0};
  __m128i v_p128 = {0};
  __m128i v_k128 = {0};

  if (((uint64_t)(a_prev.len)) == 0) {
    v_k128 = _mm_set1_epi8((int8_t)(254));
    {
      wuffs_base__slice_u8 i_slice_curr = a_curr;
      v_curr.ptr = i_slice_curr.ptr;
      v_curr.len = 4;
      uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 8) * 8);
      while (v_curr.ptr < i_end0_curr) {
        v_p128 = _mm_avg_epu8(_mm_and_si128(v_a128, v_k128), v_b128);
        v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
        v_x128 = _mm_add_epi8(v_x128, v_p128);
        v_a128 = v_x128;
        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
        v_curr.ptr += 4;
        v_p128 = _mm_avg_epu8(_mm_and_si128(v_a128, v_k128), v_b128);
        v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
        v_x128 = _mm_add_epi8(v_x128, v_p128);
        v_a128 = v_x128;
        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
        v_curr.ptr += 4;
      }
      v_curr.len = 4;
      uint8_t* i_end1_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
      while (v_curr.ptr < i_end1_curr) {
        v_p128 = _mm_avg_epu8(_mm_and_si128(v_a128, v_k128), v_b128);
        v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
        v_x128 = _mm_add_epi8(v_x128, v_p128);
        v_a128 = v_x128;
        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
        v_curr.ptr += 4;
      }
      v_curr.len = 0;
    }
  } else {
    v_k128 = _mm_set1_epi8((int8_t)(1));
    {
      wuffs_base__slice_u8 i_slice_curr = a_curr;
      v_curr.ptr = i_slice_curr.ptr;
      wuffs_base__slice_u8 i_slice_prev = a_prev;
      v_prev.ptr = i_slice_prev.ptr;
      i_slice_curr.len = ((size_t)(wuffs_base__u64__min(i_slice_curr.len, i_slice_prev.len)));
      v_curr.len = 4;
      v_prev.len = 4;
      uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 8) * 8);
      while (v_curr.ptr < i_end0_curr) {
        v_b128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
        v_p128 = _mm_avg_epu8(v_a128, v_b128);
        v_p128 = _mm_sub_epi8(v_p128, _mm_and_si128(v_k128, _mm_xor_si128(v_a128, v_b128)));
        v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
        v_x128 = _mm_add_epi8(v_x128, v_p128);
        v_a128 = v_x128;
        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
        v_curr.ptr += 4;
        v_prev.ptr += 4;
        v_b128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
        v_p128 = _mm_avg_epu8(v_a128, v_b128);
        v_p128 = _mm_sub_epi8(v_p128, _mm_and_si128(v_k128, _mm_xor_si128(v_a128, v_b128)));
        v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
        v_x128 = _mm_add_epi8(v_x128, v_p128);
        v_a128 = v_x128;
        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
        v_curr.ptr += 4;
        v_prev.ptr += 4;
      }
      v_curr.len = 4;
      v_prev.len = 4;
      uint8_t* i_end1_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
      while (v_curr.ptr < i_end1_curr) {
        v_b128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
        v_p128 = _mm_avg_epu8(v_a128, v_b128);
        v_p128 = _mm_sub_epi8(v_p128, _mm_and_si128(v_k128, _mm_xor_si128(v_a128, v_b128)));
        v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
        v_x128 = _mm_add_epi8(v_x128, v_p128);
        v_a128 = v_x128;
        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
        v_curr.ptr += 4;
        v_prev.ptr += 4;
      }
      v_curr.len = 0;
      v_prev.len = 0;
    }
  }
  return wuffs_base__make_empty_struct();
}
#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_64)

// -------- func png.decoder.filter_4_distance_3_x86_sse42

#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
#if defined(__GNUC__)
__attribute__((target("pclmul,popcnt,sse4.2")))
#endif
static wuffs_base__empty_struct
wuffs_png__decoder__filter_4_distance_3_x86_sse42(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev) {
  wuffs_base__slice_u8 v_curr = {0};
  wuffs_base__slice_u8 v_prev = {0};
  __m128i v_x128 = {0};
  __m128i v_a128 = {0};
  __m128i v_b128 = {0};
  __m128i v_c128 = {0};
  __m128i v_p128 = {0};
  __m128i v_pa128 = {0};
  __m128i v_pb128 = {0};
  __m128i v_pc128 = {0};
  __m128i v_smallest128 = {0};
  __m128i v_z128 = {0};

  {
    wuffs_base__slice_u8 i_slice_curr = a_curr;
    v_curr.ptr = i_slice_curr.ptr;
    wuffs_base__slice_u8 i_slice_prev = a_prev;
    v_prev.ptr = i_slice_prev.ptr;
    i_slice_curr.len = ((size_t)(wuffs_base__u64__min(i_slice_curr.len, i_slice_prev.len)));
    v_curr.len = 4;
    v_prev.len = 4;
    uint8_t* i_end0_curr = v_curr.ptr + wuffs_base__iterate_total_advance((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)), 7, 6);
    while (v_curr.ptr < i_end0_curr) {
      v_b128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
      v_b128 = _mm_unpacklo_epi8(v_b128, v_z128);
      v_pa128 = _mm_sub_epi16(v_b128, v_c128);
      v_pb128 = _mm_sub_epi16(v_a128, v_c128);
      v_pc128 = _mm_add_epi16(v_pa128, v_pb128);
      v_pa128 = _mm_abs_epi16(v_pa128);
      v_pb128 = _mm_abs_epi16(v_pb128);
      v_pc128 = _mm_abs_epi16(v_pc128);
      v_smallest128 = _mm_min_epi16(v_pc128, _mm_min_epi16(v_pb128, v_pa128));
      v_p128 = _mm_blendv_epi8(_mm_blendv_epi8(v_c128, v_b128, _mm_cmpeq_epi16(v_smallest128, v_pb128)), v_a128, _mm_cmpeq_epi16(v_smallest128, v_pa128));
      v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
      v_x128 = _mm_unpacklo_epi8(v_x128, v_z128);
      v_x128 = _mm_add_epi8(v_x128, v_p128);
      v_a128 = v_x128;
      v_c128 = v_b128;
      v_x128 = _mm_packus_epi16(v_x128, v_x128);
      wuffs_base__poke_u24le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
      v_curr.ptr += 3;
      v_prev.ptr += 3;
      v_b128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
      v_b128 = _mm_unpacklo_epi8(v_b128, v_z128);
      v_pa128 = _mm_sub_epi16(v_b128, v_c128);
      v_pb128 = _mm_sub_epi16(v_a128, v_c128);
      v_pc128 = _mm_add_epi16(v_pa128, v_pb128);
      v_pa128 = _mm_abs_epi16(v_pa128);
      v_pb128 = _mm_abs_epi16(v_pb128);
      v_pc128 = _mm_abs_epi16(v_pc128);
      v_smallest128 = _mm_min_epi16(v_pc128, _mm_min_epi16(v_pb128, v_pa128));
      v_p128 = _mm_blendv_epi8(_mm_blendv_epi8(v_c128, v_b128, _mm_cmpeq_epi16(v_smallest128, v_pb128)), v_a128, _mm_cmpeq_epi16(v_smallest128, v_pa128));
      v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
      v_x128 = _mm_unpacklo_epi8(v_x128, v_z128);
      v_x128 = _mm_add_epi8(v_x128, v_p128);
      v_a128 = v_x128;
      v_c128 = v_b128;
      v_x128 = _mm_packus_epi16(v_x128, v_x128);
      wuffs_base__poke_u24le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
      v_curr.ptr += 3;
      v_prev.ptr += 3;
    }
    v_curr.len = 4;
    v_prev.len = 4;
    uint8_t* i_end1_curr = v_curr.ptr + wuffs_base__iterate_total_advance((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)), 4, 3);
    while (v_curr.ptr < i_end1_curr) {
      v_b128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
      v_b128 = _mm_unpacklo_epi8(v_b128, v_z128);
      v_pa128 = _mm_sub_epi16(v_b128, v_c128);
      v_pb128 = _mm_sub_epi16(v_a128, v_c128);
      v_pc128 = _mm_add_epi16(v_pa128, v_pb128);
      v_pa128 = _mm_abs_epi16(v_pa128);
      v_pb128 = _mm_abs_epi16(v_pb128);
      v_pc128 = _mm_abs_epi16(v_pc128);
      v_smallest128 = _mm_min_epi16(v_pc128, _mm_min_epi16(v_pb128, v_pa128));
      v_p128 = _mm_blendv_epi8(_mm_blendv_epi8(v_c128, v_b128, _mm_cmpeq_epi16(v_smallest128, v_pb128)), v_a128, _mm_cmpeq_epi16(v_smallest128, v_pa128));
      v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
      v_x128 = _mm_unpacklo_epi8(v_x128, v_z128);
      v_x128 = _mm_add_epi8(v_x128, v_p128);
      v_a128 = v_x128;
      v_c128 = v_b128;
      v_x128 = _mm_packus_epi16(v_x128, v_x128);
      wuffs_base__poke_u24le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
      v_curr.ptr += 3;
      v_prev.ptr += 3;
    }
    v_curr.len = 3;
    v_prev.len = 3;
    uint8_t* i_end2_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 3) * 3);
    while (v_curr.ptr < i_end2_curr) {
      v_b128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u24le__no_bounds_check(v_prev.ptr)));
      v_b128 = _mm_unpacklo_epi8(v_b128, v_z128);
      v_pa128 = _mm_sub_epi16(v_b128, v_c128);
      v_pb128 = _mm_sub_epi16(v_a128, v_c128);
      v_pc128 = _mm_add_epi16(v_pa128, v_pb128);
      v_pa128 = _mm_abs_epi16(v_pa128);
      v_pb128 = _mm_abs_epi16(v_pb128);
      v_pc128 = _mm_abs_epi16(v_pc128);
      v_smallest128 = _mm_min_epi16(v_pc128, _mm_min_epi16(v_pb128, v_pa128));
      v_p128 = _mm_blendv_epi8(_mm_blendv_epi8(v_c128, v_b128, _mm_cmpeq_epi16(v_smallest128, v_pb128)), v_a128, _mm_cmpeq_epi16(v_smallest128, v_pa128));
      v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u24le__no_bounds_check(v_curr.ptr)));
      v_x128 = _mm_unpacklo_epi8(v_x128, v_z128);
      v_x128 = _mm_add_epi8(v_x128, v_p128);
      v_x128 = _mm_packus_epi16(v_x128, v_x128);
      wuffs_base__poke_u24le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
      v_curr.ptr += 3;
      v_prev.ptr += 3;
    }
    v_curr.len = 0;
    v_prev.len = 0;
  }
  return wuffs_base__make_empty_struct();
}
#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_64)

// -------- func png.decoder.filter_4_distance_4_x86_sse42

#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
#if defined(__GNUC__)
__attribute__((target("pclmul,popcnt,sse4.2")))
#endif
static wuffs_base__empty_struct
wuffs_png__decoder__filter_4_distance_4_x86_sse42(
    wuffs_png__decoder* self,
    wuffs_base__slice_u8 a_curr,
    wuffs_base__slice_u8 a_prev) {
  wuffs_base__slice_u8 v_curr = {0};
  wuffs_base__slice_u8 v_prev = {0};
  __m128i v_x128 = {0};
  __m128i v_a128 = {0};
  __m128i v_b128 = {0};
  __m128i v_c128 = {0};
  __m128i v_p128 = {0};
  __m128i v_pa128 = {0};
  __m128i v_pb128 = {0};
  __m128i v_pc128 = {0};
  __m128i v_smallest128 = {0};
  __m128i v_z128 = {0};

  {
    wuffs_base__slice_u8 i_slice_curr = a_curr;
    v_curr.ptr = i_slice_curr.ptr;
    wuffs_base__slice_u8 i_slice_prev = a_prev;
    v_prev.ptr = i_slice_prev.ptr;
    i_slice_curr.len = ((size_t)(wuffs_base__u64__min(i_slice_curr.len, i_slice_prev.len)));
    v_curr.len = 4;
    v_prev.len = 4;
    uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 8) * 8);
    while (v_curr.ptr < i_end0_curr) {
      v_b128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
      v_b128 = _mm_unpacklo_epi8(v_b128, v_z128);
      v_pa128 = _mm_sub_epi16(v_b128, v_c128);
      v_pb128 = _mm_sub_epi16(v_a128, v_c128);
      v_pc128 = _mm_add_epi16(v_pa128, v_pb128);
      v_pa128 = _mm_abs_epi16(v_pa128);
      v_pb128 = _mm_abs_epi16(v_pb128);
      v_pc128 = _mm_abs_epi16(v_pc128);
      v_smallest128 = _mm_min_epi16(v_pc128, _mm_min_epi16(v_pb128, v_pa128));
      v_p128 = _mm_blendv_epi8(_mm_blendv_epi8(v_c128, v_b128, _mm_cmpeq_epi16(v_smallest128, v_pb128)), v_a128, _mm_cmpeq_epi16(v_smallest128, v_pa128));
      v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
      v_x128 = _mm_unpacklo_epi8(v_x128, v_z128);
      v_x128 = _mm_add_epi8(v_x128, v_p128);
      v_a128 = v_x128;
      v_c128 = v_b128;
      v_x128 = _mm_packus_epi16(v_x128, v_x128);
      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
      v_curr.ptr += 4;
      v_prev.ptr += 4;
      v_b128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
      v_b128 = _mm_unpacklo_epi8(v_b128, v_z128);
      v_pa128 = _mm_sub_epi16(v_b128, v_c128);
      v_pb128 = _mm_sub_epi16(v_a128, v_c128);
      v_pc128 = _mm_add_epi16(v_pa128, v_pb128);
      v_pa128 = _mm_abs_epi16(v_pa128);
      v_pb128 = _mm_abs_epi16(v_pb128);
      v_pc128 = _mm_abs_epi16(v_pc128);
      v_smallest128 = _mm_min_epi16(v_pc128, _mm_min_epi16(v_pb128, v_pa128));
      v_p128 = _mm_blendv_epi8(_mm_blendv_epi8(v_c128, v_b128, _mm_cmpeq_epi16(v_smallest128, v_pb128)), v_a128, _mm_cmpeq_epi16(v_smallest128, v_pa128));
      v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
      v_x128 = _mm_unpacklo_epi8(v_x128, v_z128);
      v_x128 = _mm_add_epi8(v_x128, v_p128);
      v_a128 = v_x128;
      v_c128 = v_b128;
      v_x128 = _mm_packus_epi16(v_x128, v_x128);
      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
      v_curr.ptr += 4;
      v_prev.ptr += 4;
    }
    v_curr.len = 4;
    v_prev.len = 4;
    uint8_t* i_end1_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
    while (v_curr.ptr < i_end1_curr) {
      v_b128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
      v_b128 = _mm_unpacklo_epi8(v_b128, v_z128);
      v_pa128 = _mm_sub_epi16(v_b128, v_c128);
      v_pb128 = _mm_sub_epi16(v_a128, v_c128);
      v_pc128 = _mm_add_epi16(v_pa128, v_pb128);
      v_pa128 = _mm_abs_epi16(v_pa128);
      v_pb128 = _mm_abs_epi16(v_pb128);
      v_pc128 = _mm_abs_epi16(v_pc128);
      v_smallest128 = _mm_min_epi16(v_pc128, _mm_min_epi16(v_pb128, v_pa128));
      v_p128 = _mm_blendv_epi8(_mm_blendv_epi8(v_c128, v_b128, _mm_cmpeq_epi16(v_smallest128, v_pb128)), v_a128, _mm_cmpeq_epi16(v_smallest128, v_pa128));
      v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
      v_x128 = _mm_unpacklo_epi8(v_x128, v_z128);
      v_x128 = _mm_add_epi8(v_x128, v_p128);
      v_a128 = v_x128;
      v_c128 = v_b128;
      v_x128 = _mm_packus_epi16(v_x128, v_x128);
      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
      v_curr.ptr += 4;
      v_prev.ptr += 4;
    }
    v_curr.len = 0;
    v_prev.len = 0;
  }
  return wuffs_base__make_empty_struct();
}
#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_64)

// -------- func png.decoder.set_quirk_enabled

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_png__decoder__set_quirk_enabled(
    wuffs_png__decoder* self,
    uint32_t a_quirk,
    bool a_enabled) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }

  if (a_quirk == 1) {
    self->private_impl.f_ignore_checksum = a_enabled;
    wuffs_zlib__decoder__set_quirk_enabled(&self->private_data.f_zlib, a_quirk, a_enabled);
  }
  return wuffs_base__make_empty_struct();
}

// -------- func png.decoder.decode_image_config

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_png__decoder__decode_image_config(
    wuffs_png__decoder* self,
    wuffs_base__image_config* a_dst,
    wuffs_base__io_buffer* a_src) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 1)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint64_t v_magic = 0;
  uint64_t v_mark = 0;
  uint32_t v_checksum_have = 0;
  uint32_t v_checksum_want = 0;
  wuffs_base__status v_status = wuffs_base__make_status(NULL);

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_image_config[0];
  if (coro_susp_point) {
    v_checksum_have = self->private_data.s_decode_image_config[0].v_checksum_have;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_call_sequence != 0) {
      status = wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
      goto exit;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      uint64_t t_0;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 8)) {
        t_0 = wuffs_base__peek_u64le__no_bounds_check(iop_a_src);
        iop_a_src += 8;
      } else {
        self->private_data.s_decode_image_config[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
          uint32_t num_bits_0 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_0;
          if (num_bits_0 == 56) {
            t_0 = ((uint64_t)(*scratch));
            break;
          }
          num_bits_0 += 8;
          *scratch |= ((uint64_t)(num_bits_0)) << 56;
        }
      }
      v_magic = t_0;
    }
    if (v_magic != 727905341920923785) {
      status = wuffs_base__make_status(wuffs_png__error__bad_header);
      goto exit;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
      uint64_t t_1;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 8)) {
        t_1 = wuffs_base__peek_u64le__no_bounds_check(iop_a_src);
        iop_a_src += 8;
      } else {
        self->private_data.s_decode_image_config[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
          uint32_t num_bits_1 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_1;
          if (num_bits_1 == 56) {
            t_1 = ((uint64_t)(*scratch));
            break;
          }
          num_bits_1 += 8;
          *scratch |= ((uint64_t)(num_bits_1)) << 56;
        }
      }
      v_magic = t_1;
    }
    if (v_magic != 5927942488114331648) {
      status = wuffs_base__make_status(wuffs_png__error__bad_header);
      goto exit;
    }
    wuffs_base__ignore_status(wuffs_crc32__ieee_hasher__initialize(&self->private_data.f_crc32, sizeof (wuffs_crc32__ieee_hasher), WUFFS_VERSION, 0));
    self->private_impl.f_chunk_type_array[0] = 73;
    self->private_impl.f_chunk_type_array[1] = 72;
    self->private_impl.f_chunk_type_array[2] = 68;
    self->private_impl.f_chunk_type_array[3] = 82;
    wuffs_crc32__ieee_hasher__update_u32(&self->private_data.f_crc32, wuffs_base__make_slice_u8(self->private_impl.f_chunk_type_array, 4));
    while (true) {
      v_mark = ((uint64_t)(iop_a_src - io0_a_src));
      {
        if (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        wuffs_base__status t_2 = wuffs_png__decoder__decode_ihdr(self, a_src);
        v_status = t_2;
        if (a_src) {
          iop_a_src = a_src->data.ptr + a_src->meta.ri;
        }
      }
      if ( ! self->private_impl.f_ignore_checksum) {
        v_checksum_have = wuffs_crc32__ieee_hasher__update_u32(&self->private_data.f_crc32, wuffs_base__io__since(v_mark, ((uint64_t)(iop_a_src - io0_a_src)), io0_a_src));
      }
      if (wuffs_base__status__is_ok(&v_status)) {
        goto label__0__break;
      }
      status = v_status;
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(5);
    }
    label__0__break:;
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
      uint32_t t_3;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
        t_3 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
        iop_a_src += 4;
      } else {
        self->private_data.s_decode_image_config[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
          uint32_t num_bits_3 = ((uint32_t)(*scratch & 0xFF));
          *scratch >>= 8;
          *scratch <<= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_3);
          if (num_bits_3 == 24) {
            t_3 = ((uint32_t)(*scratch >> 32));
            break;
          }
          num_bits_3 += 8;
          *scratch |= ((uint64_t)(num_bits_3));
        }
      }
      v_checksum_want = t_3;
    }
    if ( ! self->private_impl.f_ignore_checksum && (v_checksum_have != v_checksum_want)) {
      status = wuffs_base__make_status(wuffs_png__error__bad_checksum);
      goto exit;
    }
    while (true) {
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
        uint64_t t_4;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
          t_4 = ((uint64_t)(wuffs_base__peek_u32be__no_bounds_check(iop_a_src)));
          iop_a_src += 4;
        } else {
          self->private_data.s_decode_image_config[0].scratch = 0;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(9);
          while (true) {
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
            uint32_t num_bits_4 = ((uint32_t)(*scratch & 0xFF));
            *scratch >>= 8;
            *scratch <<= 8;
            *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_4);
            if (num_bits_4 == 24) {
              t_4 = ((uint64_t)(*scratch >> 32));
              break;
            }
            num_bits_4 += 8;
            *scratch |= ((uint64_t)(num_bits_4));
          }
        }
        self->private_impl.f_chunk_length = t_4;
      }
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(10);
        uint32_t t_5;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
          t_5 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
          iop_a_src += 4;
        } else {
          self->private_data.s_decode_image_config[0].scratch = 0;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(11);
          while (true) {
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
            uint32_t num_bits_5 = ((uint32_t)(*scratch >> 56));
            *scratch <<= 8;
            *scratch >>= 8;
            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_5;
            if (num_bits_5 == 24) {
              t_5 = ((uint32_t)(*scratch));
              break;
            }
            num_bits_5 += 8;
            *scratch |= ((uint64_t)(num_bits_5)) << 56;
          }
        }
        self->private_impl.f_chunk_type = t_5;
      }
      if ( ! self->private_impl.f_ignore_checksum && ((self->private_impl.f_chunk_type == 1413563465) || (self->private_impl.f_chunk_type == 1163152464))) {
        wuffs_base__ignore_status(wuffs_crc32__ieee_hasher__initialize(&self->private_data.f_crc32, sizeof (wuffs_crc32__ieee_hasher), WUFFS_VERSION, 0));
        self->private_impl.f_chunk_type_array[0] = ((uint8_t)(((self->private_impl.f_chunk_type >> 0) & 255)));
        self->private_impl.f_chunk_type_array[1] = ((uint8_t)(((self->private_impl.f_chunk_type >> 8) & 255)));
        self->private_impl.f_chunk_type_array[2] = ((uint8_t)(((self->private_impl.f_chunk_type >> 16) & 255)));
        self->private_impl.f_chunk_type_array[3] = ((uint8_t)(((self->private_impl.f_chunk_type >> 24) & 255)));
        wuffs_crc32__ieee_hasher__update_u32(&self->private_data.f_crc32, wuffs_base__make_slice_u8(self->private_impl.f_chunk_type_array, 4));
      }
      if (self->private_impl.f_chunk_type == 1413563465) {
        goto label__1__break;
      }
      while (true) {
        v_mark = ((uint64_t)(iop_a_src - io0_a_src));
        {
          if (a_src) {
            a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
          }
          wuffs_base__status t_6 = wuffs_png__decoder__decode_other_chunk(self, a_src);
          v_status = t_6;
          if (a_src) {
            iop_a_src = a_src->data.ptr + a_src->meta.ri;
          }
        }
        if ( ! self->private_impl.f_ignore_checksum && (self->private_impl.f_chunk_type == 1163152464)) {
          v_checksum_have = wuffs_crc32__ieee_hasher__update_u32(&self->private_data.f_crc32, wuffs_base__io__since(v_mark, ((uint64_t)(iop_a_src - io0_a_src)), io0_a_src));
        }
        if (wuffs_base__status__is_ok(&v_status)) {
          goto label__2__break;
        }
        status = v_status;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(12);
      }
      label__2__break:;
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(13);
        uint32_t t_7;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
          t_7 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
          iop_a_src += 4;
        } else {
          self->private_data.s_decode_image_config[0].scratch = 0;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(14);
          while (true) {
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
            uint32_t num_bits_7 = ((uint32_t)(*scratch & 0xFF));
            *scratch >>= 8;
            *scratch <<= 8;
            *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_7);
            if (num_bits_7 == 24) {
              t_7 = ((uint32_t)(*scratch >> 32));
              break;
            }
            num_bits_7 += 8;
            *scratch |= ((uint64_t)(num_bits_7));
          }
        }
        v_checksum_want = t_7;
      }
      if ( ! self->private_impl.f_ignore_checksum && (self->private_impl.f_chunk_type == 1163152464) && (v_checksum_have != v_checksum_want)) {
        status = wuffs_base__make_status(wuffs_png__error__bad_checksum);
        goto exit;
      }
    }
    label__1__break:;
    if ((self->private_impl.f_color_type == 3) &&  ! self->private_impl.f_seen_plte) {
      status = wuffs_base__make_status(wuffs_png__error__missing_palette);
      goto exit;
    }
    self->private_impl.f_frame_config_io_position = wuffs_base__u64__sat_add(a_src->meta.pos, ((uint64_t)(iop_a_src - io0_a_src)));
    if (a_dst != NULL) {
      wuffs_base__image_config__set(
          a_dst,
          self->private_impl.f_dst_pixfmt,
          0,
          self->private_impl.f_width,
          self->private_impl.f_height,
          self->private_impl.f_frame_config_io_position,
          ((self->private_impl.f_color_type <= 3) &&  ! self->private_impl.f_seen_trns));
    }
    self->private_impl.f_call_sequence = 3;

    goto ok;
    ok:
    self->private_impl.p_decode_image_config[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_image_config[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 1 : 0;
  self->private_data.s_decode_image_config[0].v_checksum_have = v_checksum_have;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func png.decoder.decode_ihdr

static wuffs_base__status
wuffs_png__decoder__decode_ihdr(
    wuffs_png__decoder* self,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint32_t v_a32 = 0;
  uint8_t v_a8 = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_ihdr[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      uint32_t t_0;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
        t_0 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
        iop_a_src += 4;
      } else {
        self->private_data.s_decode_ihdr[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_ihdr[0].scratch;
          uint32_t num_bits_0 = ((uint32_t)(*scratch & 0xFF));
          *scratch >>= 8;
          *scratch <<= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_0);
          if (num_bits_0 == 24) {
            t_0 = ((uint32_t)(*scratch >> 32));
            break;
          }
          num_bits_0 += 8;
          *scratch |= ((uint64_t)(num_bits_0));
        }
      }
      v_a32 = t_0;
    }
    if (v_a32 >= 2147483648) {
      status = wuffs_base__make_status(wuffs_png__error__bad_header);
      goto exit;
    } else if (v_a32 >= 16777216) {
      status = wuffs_base__make_status(wuffs_png__error__unsupported_png_file);
      goto exit;
    }
    self->private_impl.f_width = v_a32;
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
      uint32_t t_1;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
        t_1 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
        iop_a_src += 4;
      } else {
        self->private_data.s_decode_ihdr[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_ihdr[0].scratch;
          uint32_t num_bits_1 = ((uint32_t)(*scratch & 0xFF));
          *scratch >>= 8;
          *scratch <<= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_1);
          if (num_bits_1 == 24) {
            t_1 = ((uint32_t)(*scratch >> 32));
            break;
          }
          num_bits_1 += 8;
          *scratch |= ((uint64_t)(num_bits_1));
        }
      }
      v_a32 = t_1;
    }
    if (v_a32 >= 2147483648) {
      status = wuffs_base__make_status(wuffs_png__error__bad_header);
      goto exit;
    } else if (v_a32 >= 16777216) {
      status = wuffs_base__make_status(wuffs_png__error__unsupported_png_file);
      goto exit;
    }
    self->private_impl.f_height = v_a32;
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      uint8_t t_2 = *iop_a_src++;
      v_a8 = t_2;
    }
    if (v_a8 > 16) {
      status = wuffs_base__make_status(wuffs_png__error__bad_header);
      goto exit;
    }
    self->private_impl.f_depth = v_a8;
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      uint8_t t_3 = *iop_a_src++;
      v_a8 = t_3;
    }
    if ((v_a8 == 1) || (v_a8 == 5) || (v_a8 > 6)) {
      status = wuffs_base__make_status(wuffs_png__error__bad_header);
      goto exit;
    }
    self->private_impl.f_color_type = v_a8;
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      uint8_t t_4 = *iop_a_src++;
      v_a8 = t_4;
    }
    if (v_a8 != 0) {
      status = wuffs_base__make_status(wuffs_png__error__bad_header);
      goto exit;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      uint8_t t_5 = *iop_a_src++;
      v_a8 = t_5;
    }
    if (v_a8 != 0) {
      status = wuffs_base__make_status(wuffs_png__error__bad_header);
      goto exit;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(9);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      uint8_t t_6 = *iop_a_src++;
      v_a8 = t_6;
    }
    if (v_a8 == 0) {
      self->private_impl.f_interlace_pass = 0;
    } else if (v_a8 == 1) {
      self->private_impl.f_interlace_pass = 1;
      self->private_impl.choosy_filter_and_swizzle = (
          &wuffs_png__decoder__filter_and_swizzle_tricky);
    } else {
      status = wuffs_base__make_status(wuffs_png__error__bad_header);
      goto exit;
    }
    self->private_impl.f_filter_distance = 0;
    wuffs_png__decoder__assign_filter_distance(self);
    if (self->private_impl.f_filter_distance == 0) {
      status = wuffs_base__make_status(wuffs_png__error__unsupported_png_file);
      goto exit;
    }
    self->private_impl.f_overall_workbuf_length = (((uint64_t)(self->private_impl.f_height)) * (1 + wuffs_png__decoder__calculate_bytes_per_row(self, self->private_impl.f_width)));
    wuffs_png__decoder__choose_filter_implementations(self);

    goto ok;
    ok:
    self->private_impl.p_decode_ihdr[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_ihdr[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func png.decoder.assign_filter_distance

static wuffs_base__empty_struct
wuffs_png__decoder__assign_filter_distance(
    wuffs_png__decoder* self) {
  if (self->private_impl.f_depth < 8) {
    if (self->private_impl.f_color_type == 0) {
      self->private_impl.f_dst_pixfmt = 536870920;
      self->private_impl.f_src_pixfmt = 536870920;
    } else if (self->private_impl.f_color_type == 3) {
      self->private_impl.f_dst_pixfmt = 2198077448;
      self->private_impl.f_src_pixfmt = 2198077448;
    } else {
      return wuffs_base__make_empty_struct();
    }
    self->private_impl.f_filter_distance = 1;
    self->private_impl.choosy_filter_and_swizzle = (
        &wuffs_png__decoder__filter_and_swizzle_tricky);
  } else if (self->private_impl.f_color_type == 0) {
    if (self->private_impl.f_depth == 8) {
      self->private_impl.f_dst_pixfmt = 536870920;
      self->private_impl.f_src_pixfmt = 536870920;
      self->private_impl.f_filter_distance = 1;
    } else if (self->private_impl.f_depth == 16) {
      self->private_impl.f_dst_pixfmt = 536870920;
      self->private_impl.f_src_pixfmt = 537919499;
      self->private_impl.f_filter_distance = 2;
    }
  } else if (self->private_impl.f_color_type == 2) {
    if (self->private_impl.f_depth == 8) {
      self->private_impl.f_dst_pixfmt = 2147485832;
      self->private_impl.f_src_pixfmt = 2684356744;
      self->private_impl.f_filter_distance = 3;
    } else if (self->private_impl.f_depth == 16) {
      self->private_impl.f_dst_pixfmt = 2164308923;
      self->private_impl.f_src_pixfmt = 2164308923;
      self->private_impl.f_filter_distance = 6;
      self->private_impl.choosy_filter_and_swizzle = (
          &wuffs_png__decoder__filter_and_swizzle_tricky);
    }
  } else if (self->private_impl.f_color_type == 3) {
    if (self->private_impl.f_depth == 8) {
      self->private_impl.f_dst_pixfmt = 2198077448;
      self->private_impl.f_src_pixfmt = 2198077448;
      self->private_impl.f_filter_distance = 1;
    }
  } else if (self->private_impl.f_color_type == 4) {
    if (self->private_impl.f_depth == 8) {
      self->private_impl.f_dst_pixfmt = 2164295816;
      self->private_impl.f_src_pixfmt = 2164295816;
      self->private_impl.f_filter_distance = 2;
      self->private_impl.choosy_filter_and_swizzle = (
          &wuffs_png__decoder__filter_and_swizzle_tricky);
    } else if (self->private_impl.f_depth == 16) {
      self->private_impl.f_dst_pixfmt = 2164308923;
      self->private_impl.f_src_pixfmt = 2164308923;
      self->private_impl.f_filter_distance = 4;
      self->private_impl.choosy_filter_and_swizzle = (
          &wuffs_png__decoder__filter_and_swizzle_tricky);
    }
  } else if (self->private_impl.f_color_type == 6) {
    if (self->private_impl.f_depth == 8) {
      self->private_impl.f_dst_pixfmt = 2164295816;
      self->private_impl.f_src_pixfmt = 2701166728;
      self->private_impl.f_filter_distance = 4;
    } else if (self->private_impl.f_depth == 16) {
      self->private_impl.f_dst_pixfmt = 2164308923;
      self->private_impl.f_src_pixfmt = 2164308923;
      self->private_impl.f_filter_distance = 8;
      self->private_impl.choosy_filter_and_swizzle = (
          &wuffs_png__decoder__filter_and_swizzle_tricky);
    }
  }
  return wuffs_base__make_empty_struct();
}

// -------- func png.decoder.calculate_bytes_per_row

static uint64_t
wuffs_png__decoder__calculate_bytes_per_row(
    const wuffs_png__decoder* self,
    uint32_t a_width) {
  uint64_t v_bytes_per_channel = 0;

  if (self->private_impl.f_depth == 1) {
    return ((uint64_t)(((a_width + 7) / 8)));
  } else if (self->private_impl.f_depth == 2) {
    return ((uint64_t)(((a_width + 3) / 4)));
  } else if (self->private_impl.f_depth == 4) {
    return ((uint64_t)(((a_width + 1) / 2)));
  }
  v_bytes_per_channel = ((uint64_t)((self->private_impl.f_depth >> 3)));
  return (((uint64_t)(a_width)) * v_bytes_per_channel * ((uint64_t)(WUFFS_PNG__NUM_CHANNELS[self->private_impl.f_color_type])));
}

// -------- func png.decoder.choose_filter_implementations

static wuffs_base__empty_struct
wuffs_png__decoder__choose_filter_implementations(
    wuffs_png__decoder* self) {
  if (self->private_impl.f_filter_distance == 3) {
    self->private_impl.choosy_filter_1 = (
        &wuffs_png__decoder__filter_1_distance_3_fallback);
    self->private_impl.choosy_filter_3 = (
        &wuffs_png__decoder__filter_3_distance_3_fallback);
    self->private_impl.choosy_filter_4 = (
#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
        wuffs_base__cpu_arch__have_arm_neon() ? &wuffs_png__decoder__filter_4_distance_3_arm_neon :
#endif
#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
        wuffs_base__cpu_arch__have_x86_sse42() ? &wuffs_png__decoder__filter_4_distance_3_x86_sse42 :
#endif
        &wuffs_png__decoder__filter_4_distance_3_fallback);
  } else if (self->private_impl.f_filter_distance == 4) {
    self->private_impl.choosy_filter_1 = (
#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
        wuffs_base__cpu_arch__have_arm_neon() ? &wuffs_png__decoder__filter_1_distance_4_arm_neon :
#endif
#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
        wuffs_base__cpu_arch__have_x86_sse42() ? &wuffs_png__decoder__filter_1_distance_4_x86_sse42 :
#endif
        &wuffs_png__decoder__filter_1_distance_4_fallback);
    self->private_impl.choosy_filter_3 = (
#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
        wuffs_base__cpu_arch__have_arm_neon() ? &wuffs_png__decoder__filter_3_distance_4_arm_neon :
#endif
#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
        wuffs_base__cpu_arch__have_x86_sse42() ? &wuffs_png__decoder__filter_3_distance_4_x86_sse42 :
#endif
        &wuffs_png__decoder__filter_3_distance_4_fallback);
    self->private_impl.choosy_filter_4 = (
#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
        wuffs_base__cpu_arch__have_arm_neon() ? &wuffs_png__decoder__filter_4_distance_4_arm_neon :
#endif
#if defined(WUFFS_BASE__CPU_ARCH__X86_64)
        wuffs_base__cpu_arch__have_x86_sse42() ? &wuffs_png__decoder__filter_4_distance_4_x86_sse42 :
#endif
        &wuffs_png__decoder__filter_4_distance_4_fallback);
  }
  return wuffs_base__make_empty_struct();
}

// -------- func png.decoder.decode_other_chunk

static wuffs_base__status
wuffs_png__decoder__decode_other_chunk(
    wuffs_png__decoder* self,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_other_chunk[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_chunk_type == 1163152464) {
      if (self->private_impl.f_seen_plte || (self->private_impl.f_color_type != 3)) {
        status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
        goto exit;
      }
      if (a_src) {
        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
      }
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      status = wuffs_png__decoder__decode_plte(self, a_src);
      if (a_src) {
        iop_a_src = a_src->data.ptr + a_src->meta.ri;
      }
      if (status.repr) {
        goto suspend;
      }
      self->private_impl.f_seen_plte = true;
    } else if (self->private_impl.f_chunk_type == 1397641844) {
      if (self->private_impl.f_seen_trns || (self->private_impl.f_color_type > 3) || ((self->private_impl.f_color_type == 3) &&  ! self->private_impl.f_seen_plte)) {
        status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
        goto exit;
      }
      if (a_src) {
        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
      }
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
      status = wuffs_png__decoder__decode_trns(self, a_src);
      if (a_src) {
        iop_a_src = a_src->data.ptr + a_src->meta.ri;
      }
      if (status.repr) {
        goto suspend;
      }
      self->private_impl.f_seen_trns = true;
    } else {
      self->private_data.s_decode_other_chunk[0].scratch = self->private_impl.f_chunk_length;
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
      if (self->private_data.s_decode_other_chunk[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
        self->private_data.s_decode_other_chunk[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
        iop_a_src = io2_a_src;
        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
        goto suspend;
      }
      iop_a_src += self->private_data.s_decode_other_chunk[0].scratch;
    }

    goto ok;
    ok:
    self->private_impl.p_decode_other_chunk[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_other_chunk[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func png.decoder.decode_plte

static wuffs_base__status
wuffs_png__decoder__decode_plte(
    wuffs_png__decoder* self,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint32_t v_num_entries = 0;
  uint32_t v_i = 0;
  uint32_t v_argb = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_plte[0];
  if (coro_susp_point) {
    v_num_entries = self->private_data.s_decode_plte[0].v_num_entries;
    v_i = self->private_data.s_decode_plte[0].v_i;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if ((self->private_impl.f_chunk_length > 768) || ((self->private_impl.f_chunk_length % 3) != 0)) {
      status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
      goto exit;
    }
    v_num_entries = (((uint32_t)(self->private_impl.f_chunk_length)) / 3);
    while (v_i < v_num_entries) {
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
        uint32_t t_0;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 3)) {
          t_0 = ((uint32_t)(wuffs_base__peek_u24be__no_bounds_check(iop_a_src)));
          iop_a_src += 3;
        } else {
          self->private_data.s_decode_plte[0].scratch = 0;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
          while (true) {
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              goto suspend;
            }
            uint64_t* scratch = &self->private_data.s_decode_plte[0].scratch;
            uint32_t num_bits_0 = ((uint32_t)(*scratch & 0xFF));
            *scratch >>= 8;
            *scratch <<= 8;
            *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_0);
            if (num_bits_0 == 16) {
              t_0 = ((uint32_t)(*scratch >> 40));
              break;
            }
            num_bits_0 += 8;
            *scratch |= ((uint64_t)(num_bits_0));
          }
        }
        v_argb = t_0;
      }
      v_argb |= 4278190080;
      self->private_data.f_src_palette[((4 * v_i) + 0)] = ((uint8_t)(((v_argb >> 0) & 255)));
      self->private_data.f_src_palette[((4 * v_i) + 1)] = ((uint8_t)(((v_argb >> 8) & 255)));
      self->private_data.f_src_palette[((4 * v_i) + 2)] = ((uint8_t)(((v_argb >> 16) & 255)));
      self->private_data.f_src_palette[((4 * v_i) + 3)] = ((uint8_t)(((v_argb >> 24) & 255)));
      v_i += 1;
    }
    while (v_i < 256) {
      self->private_data.f_src_palette[((4 * v_i) + 0)] = 0;
      self->private_data.f_src_palette[((4 * v_i) + 1)] = 0;
      self->private_data.f_src_palette[((4 * v_i) + 2)] = 0;
      self->private_data.f_src_palette[((4 * v_i) + 3)] = 255;
      v_i += 1;
    }

    goto ok;
    ok:
    self->private_impl.p_decode_plte[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_plte[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_data.s_decode_plte[0].v_num_entries = v_num_entries;
  self->private_data.s_decode_plte[0].v_i = v_i;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func png.decoder.decode_trns

static wuffs_base__status
wuffs_png__decoder__decode_trns(
    wuffs_png__decoder* self,
    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint32_t v_num_entries = 0;
  uint32_t v_i = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_trns[0];
  if (coro_susp_point) {
    v_num_entries = self->private_data.s_decode_trns[0].v_num_entries;
    v_i = self->private_data.s_decode_trns[0].v_i;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_chunk_length > 256) {
      status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
      goto exit;
    }
    v_num_entries = ((uint32_t)(self->private_impl.f_chunk_length));
    while (v_i < v_num_entries) {
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
          goto suspend;
        }
        uint8_t t_0 = *iop_a_src++;
        self->private_data.f_src_palette[((4 * v_i) + 3)] = t_0;
      }
      v_i += 1;
    }
    if (self->private_impl.f_color_type == 3) {
      self->private_impl.f_dst_pixfmt = 2164523016;
      self->private_impl.f_src_pixfmt = 2164523016;
    } else {
      self->private_impl.choosy_filter_and_swizzle = (
          &wuffs_png__decoder__filter_and_swizzle_tricky);
      if (self->private_impl.f_color_type == 0) {
        self->private_impl.f_dst_pixfmt = 2164295816;
        self->private_impl.f_src_pixfmt = 2164308923;
      } else if (self->private_impl.f_color_type == 2) {
        self->private_impl.f_dst_pixfmt = 2164295816;
        self->private_impl.f_src_pixfmt = 2164308923;
      }
    }

    goto ok;
    ok:
    self->private_impl.p_decode_trns[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_trns[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_data.s_decode_trns[0].v_num_entries = v_num_entries;
  self->private_data.s_decode_trns[0].v_i = v_i;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func png.decoder.decode_frame_config

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_png__decoder__decode_frame_config(
    wuffs_png__decoder* self,
    wuffs_base__frame_config* a_dst,
    wuffs_base__io_buffer* a_src) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 2)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_frame_config[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_call_sequence < 3) {
      if (a_src) {
        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
      }
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      status = wuffs_png__decoder__decode_image_config(self, NULL, a_src);
      if (a_src) {
        iop_a_src = a_src->data.ptr + a_src->meta.ri;
      }
      if (status.repr) {
        goto suspend;
      }
    } else if (self->private_impl.f_call_sequence == 3) {
      if (self->private_impl.f_frame_config_io_position != wuffs_base__u64__sat_add(a_src->meta.pos, ((uint64_t)(iop_a_src - io0_a_src)))) {
        status = wuffs_base__make_status(wuffs_base__error__bad_restart);
        goto exit;
      }
    } else if (self->private_impl.f_call_sequence == 4) {
      self->private_impl.f_call_sequence = 255;
      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
      goto ok;
    } else {
      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
      goto ok;
    }
    if (a_dst != NULL) {
      wuffs_base__frame_config__set(
          a_dst,
          wuffs_base__utility__make_rect_ie_u32(
          0,
          0,
          self->private_impl.f_width,
          self->private_impl.f_height),
          ((wuffs_base__flicks)(0)),
          0,
          self->private_impl.f_frame_config_io_position,
          0,
          false,
          false,
          0);
    }
    self->private_impl.f_call_sequence = 4;

    goto ok;
    ok:
    self->private_impl.p_decode_frame_config[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_frame_config[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 2 : 0;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func png.decoder.decode_frame

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_png__decoder__decode_frame(
    wuffs_png__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__pixel_blend a_blend,
    wuffs_base__slice_u8 a_workbuf,
    wuffs_base__decode_frame_options* a_opts) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_dst || !a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 3)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  wuffs_base__status v_status = wuffs_base__make_status(NULL);
  uint32_t v_pass_width = 0;
  uint32_t v_pass_height = 0;

  uint32_t coro_susp_point = self->private_impl.p_decode_frame[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_call_sequence < 4) {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      status = wuffs_png__decoder__decode_frame_config(self, NULL, a_src);
      if (status.repr) {
        goto suspend;
      }
    } else if (self->private_impl.f_call_sequence == 4) {
    } else {
      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
      goto ok;
    }
    v_status = wuffs_base__pixel_swizzler__prepare(&self->private_impl.f_swizzler,
        wuffs_base__pixel_buffer__pixel_format(a_dst),
        wuffs_base__pixel_buffer__palette_or_else(a_dst, wuffs_base__make_slice_u8(self->private_data.f_dst_palette, 1024)),
        wuffs_base__utility__make_pixel_format(self->private_impl.f_src_pixfmt),
        wuffs_base__make_slice_u8(self->private_data.f_src_palette, 1024),
        a_blend);
    if ( ! wuffs_base__status__is_ok(&v_status)) {
      status = v_status;
      if (wuffs_base__status__is_error(&status)) {
        goto exit;
      } else if (wuffs_base__status__is_suspension(&status)) {
        status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
        goto exit;
      }
      goto ok;
    }
    while (true) {
      v_pass_width = (16777215 & ((((uint32_t)(WUFFS_PNG__INTERLACING[self->private_impl.f_interlace_pass][1])) + self->private_impl.f_width) >> WUFFS_PNG__INTERLACING[self->private_impl.f_interlace_pass][0]));
      v_pass_height = (16777215 & ((((uint32_t)(WUFFS_PNG__INTERLACING[self->private_impl.f_interlace_pass][4])) + self->private_impl.f_height) >> WUFFS_PNG__INTERLACING[self->private_impl.f_interlace_pass][3]));
      if ((v_pass_width > 0) && (v_pass_height > 0)) {
        self->private_impl.f_pass_bytes_per_row = wuffs_png__decoder__calculate_bytes_per_row(self, v_pass_width);
        self->private_impl.f_pass_workbuf_length = (((uint64_t)(v_pass_height)) * (1 + self->private_impl.f_pass_bytes_per_row));
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
        status = wuffs_png__decoder__decode_pass(self, a_src, a_workbuf);
        if (status.repr) {
          goto suspend;
        }
        v_status = wuffs_png__decoder__filter_and_swizzle(self, a_dst, a_workbuf);
        if ( ! wuffs_base__status__is_ok(&v_status)) {
          status = v_status;
          if (wuffs_base__status__is_error(&status)) {
            goto exit;
          } else if (wuffs_base__status__is_suspension(&status)) {
            status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
            goto exit;
          }
          goto ok;
        }
      }
      if ((self->private_impl.f_interlace_pass == 0) || (self->private_impl.f_interlace_pass >= 7)) {
        goto label__0__break;
      }
#if defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wconversion"
#endif
      self->private_impl.f_interlace_pass += 1;
#if defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
    }
    label__0__break:;
    self->private_impl.f_call_sequence = 255;

    goto ok;
    ok:
    self->private_impl.p_decode_frame[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_frame[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 3 : 0;

  goto exit;
  exit:
  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func png.decoder.decode_pass

static wuffs_base__status
wuffs_png__decoder__decode_pass(
    wuffs_png__decoder* self,
    wuffs_base__io_buffer* a_src,
    wuffs_base__slice_u8 a_workbuf) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  wuffs_base__io_buffer u_w = wuffs_base__empty_io_buffer();
  wuffs_base__io_buffer* v_w = &u_w;
  uint8_t* iop_v_w WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io0_v_w WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_v_w WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_v_w WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint64_t v_w_mark = 0;
  uint64_t v_r_mark = 0;
  wuffs_base__status v_zlib_status = wuffs_base__make_status(NULL);
  uint32_t v_checksum_have = 0;
  uint32_t v_checksum_want = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_pass[0];
  if (coro_susp_point) {
    v_checksum_have = self->private_data.s_decode_pass[0].v_checksum_have;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    self->private_impl.f_workbuf_wi = 0;
    label__0__continue:;
    while (true) {
      if ((self->private_impl.f_workbuf_wi > self->private_impl.f_pass_workbuf_length) || (self->private_impl.f_pass_workbuf_length > ((uint64_t)(a_workbuf.len)))) {
        status = wuffs_base__make_status(wuffs_base__error__bad_workbuf_length);
        goto exit;
      }
      {
        wuffs_base__io_buffer* o_0_v_w = v_w;
        uint8_t *o_0_iop_v_w = iop_v_w;
        uint8_t *o_0_io0_v_w = io0_v_w;
        uint8_t *o_0_io1_v_w = io1_v_w;
        uint8_t *o_0_io2_v_w = io2_v_w;
        v_w = wuffs_base__io_writer__set(
            &u_w,
            &iop_v_w,
            &io0_v_w,
            &io1_v_w,
            &io2_v_w,
            wuffs_base__slice_u8__subslice_ij(a_workbuf,
            self->private_impl.f_workbuf_wi,
            self->private_impl.f_pass_workbuf_length));
        {
          const uint8_t *o_1_io2_a_src = io2_a_src;
          wuffs_base__io_reader__limit(&io2_a_src, iop_a_src,
              self->private_impl.f_chunk_length);
          if (a_src) {
            a_src->meta.wi = ((size_t)(io2_a_src - a_src->data.ptr));
          }
          v_w_mark = ((uint64_t)(iop_v_w - io0_v_w));
          v_r_mark = ((uint64_t)(iop_a_src - io0_a_src));
          {
            u_w.meta.wi = ((size_t)(iop_v_w - u_w.data.ptr));
            if (a_src) {
              a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
            }
            wuffs_base__status t_0 = wuffs_zlib__decoder__transform_io(&self->private_data.f_zlib, v_w, a_src, wuffs_base__utility__empty_slice_u8());
            v_zlib_status = t_0;
            iop_v_w = u_w.data.ptr + u_w.meta.wi;
            if (a_src) {
              iop_a_src = a_src->data.ptr + a_src->meta.ri;
            }
          }
          if ( ! self->private_impl.f_ignore_checksum) {
            wuffs_crc32__ieee_hasher__update_u32(&self->private_data.f_crc32, wuffs_base__io__since(v_r_mark, ((uint64_t)(iop_a_src - io0_a_src)), io0_a_src));
          }
          wuffs_base__u64__sat_sub_indirect(&self->private_impl.f_chunk_length, wuffs_base__io__count_since(v_r_mark, ((uint64_t)(iop_a_src - io0_a_src))));
          wuffs_base__u64__sat_add_indirect(&self->private_impl.f_workbuf_wi, wuffs_base__io__count_since(v_w_mark, ((uint64_t)(iop_v_w - io0_v_w))));
          io2_a_src = o_1_io2_a_src;
          if (a_src) {
            a_src->meta.wi = ((size_t)(io2_a_src - a_src->data.ptr));
          }
        }
        v_w = o_0_v_w;
        iop_v_w = o_0_iop_v_w;
        io0_v_w = o_0_io0_v_w;
        io1_v_w = o_0_io1_v_w;
        io2_v_w = o_0_io2_v_w;
      }
      if (wuffs_base__status__is_ok(&v_zlib_status)) {
        if ( ! self->private_impl.f_ignore_checksum) {
          if (self->private_impl.f_chunk_length > 0) {
            status = wuffs_base__make_status(wuffs_base__error__too_much_data);
            goto exit;
          }
          v_checksum_have = wuffs_crc32__ieee_hasher__update_u32(&self->private_data.f_crc32, wuffs_base__utility__empty_slice_u8());
          {
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
            uint32_t t_1;
            if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
              t_1 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
              iop_a_src += 4;
            } else {
              self->private_data.s_decode_pass[0].scratch = 0;
              WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
              while (true) {
                if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
                  status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                  goto suspend;
                }
                uint64_t* scratch = &self->private_data.s_decode_pass[0].scratch;
                uint32_t num_bits_1 = ((uint32_t)(*scratch & 0xFF));
                *scratch >>= 8;
                *scratch <<= 8;
                *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_1);
                if (num_bits_1 == 24) {
                  t_1 = ((uint32_t)(*scratch >> 32));
                  break;
                }
                num_bits_1 += 8;
                *scratch |= ((uint64_t)(num_bits_1));
              }
            }
            v_checksum_want = t_1;
          }
          if (v_checksum_have != v_checksum_want) {
            status = wuffs_base__make_status(wuffs_png__error__bad_checksum);
            goto exit;
          }
        }
        goto label__0__break;
      } else if (v_zlib_status.repr == wuffs_base__suspension__short_write) {
        if ((1 <= self->private_impl.f_interlace_pass) && (self->private_impl.f_interlace_pass <= 6)) {
          goto label__0__break;
        }
        status = wuffs_base__make_status(wuffs_base__error__too_much_data);
        goto exit;
      } else if (v_zlib_status.repr != wuffs_base__suspension__short_read) {
        status = v_zlib_status;
        if (wuffs_base__status__is_error(&status)) {
          goto exit;
        } else if (wuffs_base__status__is_suspension(&status)) {
          status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
          goto exit;
        }
        goto ok;
      } else if (self->private_impl.f_chunk_length == 0) {
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
          uint32_t t_2;
          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
            t_2 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
            iop_a_src += 4;
          } else {
            self->private_data.s_decode_pass[0].scratch = 0;
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
            while (true) {
              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                goto suspend;
              }
              uint64_t* scratch = &self->private_data.s_decode_pass[0].scratch;
              uint32_t num_bits_2 = ((uint32_t)(*scratch & 0xFF));
              *scratch >>= 8;
              *scratch <<= 8;
              *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_2);
              if (num_bits_2 == 24) {
                t_2 = ((uint32_t)(*scratch >> 32));
                break;
              }
              num_bits_2 += 8;
              *scratch |= ((uint64_t)(num_bits_2));
            }
          }
          v_checksum_want = t_2;
        }
        if ( ! self->private_impl.f_ignore_checksum) {
          v_checksum_have = wuffs_crc32__ieee_hasher__update_u32(&self->private_data.f_crc32, wuffs_base__utility__empty_slice_u8());
          if (v_checksum_have != v_checksum_want) {
            status = wuffs_base__make_status(wuffs_png__error__bad_checksum);
            goto exit;
          }
        }
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
          uint64_t t_3;
          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
            t_3 = ((uint64_t)(wuffs_base__peek_u32be__no_bounds_check(iop_a_src)));
            iop_a_src += 4;
          } else {
            self->private_data.s_decode_pass[0].scratch = 0;
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
            while (true) {
              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                goto suspend;
              }
              uint64_t* scratch = &self->private_data.s_decode_pass[0].scratch;
              uint32_t num_bits_3 = ((uint32_t)(*scratch & 0xFF));
              *scratch >>= 8;
              *scratch <<= 8;
              *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_3);
              if (num_bits_3 == 24) {
                t_3 = ((uint64_t)(*scratch >> 32));
                break;
              }
              num_bits_3 += 8;
              *scratch |= ((uint64_t)(num_bits_3));
            }
          }
          self->private_impl.f_chunk_length = t_3;
        }
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
          uint32_t t_4;
          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
            t_4 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
            iop_a_src += 4;
          } else {
            self->private_data.s_decode_pass[0].scratch = 0;
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
            while (true) {
              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
                goto suspend;
              }
              uint64_t* scratch = &self->private_data.s_decode_pass[0].scratch;
              uint32_t num_bits_4 = ((uint32_t)(*scratch >> 56));
              *scratch <<= 8;
              *scratch >>= 8;
              *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_4;
              if (num_bits_4 == 24) {
                t_4 = ((uint32_t)(*scratch));
                break;
              }
              num_bits_4 += 8;
              *scratch |= ((uint64_t)(num_bits_4)) << 56;
            }
          }
          self->private_impl.f_chunk_type = t_4;
        }
        if (self->private_impl.f_chunk_type != 1413563465) {
          status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
          goto exit;
        }
        if ( ! self->private_impl.f_ignore_checksum) {
          wuffs_base__ignore_status(wuffs_crc32__ieee_hasher__initialize(&self->private_data.f_crc32, sizeof (wuffs_crc32__ieee_hasher), WUFFS_VERSION, 0));
          self->private_impl.f_chunk_type_array[0] = 73;
          self->private_impl.f_chunk_type_array[1] = 68;
          self->private_impl.f_chunk_type_array[2] = 65;
          self->private_impl.f_chunk_type_array[3] = 84;
          wuffs_crc32__ieee_hasher__update_u32(&self->private_data.f_crc32, wuffs_base__make_slice_u8(self->private_impl.f_chunk_type_array, 4));
        }
        goto label__0__continue;
      } else if (((uint64_t)(io2_a_src - iop_a_src)) > 0) {
        status = wuffs_base__make_status(wuffs_png__error__internal_error_zlib_decoder_did_not_exhaust_its_input);
        goto exit;
      }
      status = wuffs_base__make_status(wuffs_base__suspension__short_read);
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(9);
    }
    label__0__break:;
    if (self->private_impl.f_workbuf_wi != self->private_impl.f_pass_workbuf_length) {
      status = wuffs_base__make_status(wuffs_base__error__not_enough_data);
      goto exit;
    } else if (0 < ((uint64_t)(a_workbuf.len))) {
      if (a_workbuf.ptr[0] == 4) {
        a_workbuf.ptr[0] = 1;
      }
    }

    goto ok;
    ok:
    self->private_impl.p_decode_pass[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_pass[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_data.s_decode_pass[0].v_checksum_have = v_checksum_have;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func png.decoder.frame_dirty_rect

WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
wuffs_png__decoder__frame_dirty_rect(
    const wuffs_png__decoder* self) {
  if (!self) {
    return wuffs_base__utility__empty_rect_ie_u32();
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__empty_rect_ie_u32();
  }

  return wuffs_base__utility__make_rect_ie_u32(
      0,
      0,
      self->private_impl.f_width,
      self->private_impl.f_height);
}

// -------- func png.decoder.num_animation_loops

WUFFS_BASE__MAYBE_STATIC uint32_t
wuffs_png__decoder__num_animation_loops(
    const wuffs_png__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  return 0;
}

// -------- func png.decoder.num_decoded_frame_configs

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_png__decoder__num_decoded_frame_configs(
    const wuffs_png__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  if (self->private_impl.f_call_sequence > 3) {
    return 1;
  }
  return 0;
}

// -------- func png.decoder.num_decoded_frames

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_png__decoder__num_decoded_frames(
    const wuffs_png__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  if (self->private_impl.f_call_sequence > 4) {
    return 1;
  }
  return 0;
}

// -------- func png.decoder.restart_frame

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_png__decoder__restart_frame(
    wuffs_png__decoder* self,
    uint64_t a_index,
    uint64_t a_io_position) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }

  if (self->private_impl.f_call_sequence < 3) {
    return wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
  }
  if (a_index != 0) {
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  self->private_impl.f_call_sequence = 3;
  if (self->private_impl.f_interlace_pass >= 1) {
    self->private_impl.f_interlace_pass = 1;
  }
  self->private_impl.f_frame_config_io_position = a_io_position;
  return wuffs_base__make_status(NULL);
}

// -------- func png.decoder.set_report_metadata

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_png__decoder__set_report_metadata(
    wuffs_png__decoder* self,
    uint32_t a_fourcc,
    bool a_report) {
  return wuffs_base__make_empty_struct();
}

// -------- func png.decoder.tell_me_more

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_png__decoder__tell_me_more(
    wuffs_png__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__more_information* a_minfo,
    wuffs_base__io_buffer* a_src) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_dst || !a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 4)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  status = wuffs_base__make_status(wuffs_base__error__no_more_information);
  goto exit;

  goto ok;
  ok:
  goto exit;
  exit:
  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func png.decoder.workbuf_len

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_png__decoder__workbuf_len(
    const wuffs_png__decoder* self) {
  if (!self) {
    return wuffs_base__utility__empty_range_ii_u64();
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__empty_range_ii_u64();
  }

  return wuffs_base__utility__make_range_ii_u64(self->private_impl.f_overall_workbuf_length, self->private_impl.f_overall_workbuf_length);
}

// -------- func png.decoder.filter_and_swizzle

static wuffs_base__status
wuffs_png__decoder__filter_and_swizzle(
    wuffs_png__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__slice_u8 a_workbuf) {
  return (*self->private_impl.choosy_filter_and_swizzle)(self, a_dst, a_workbuf);
}

static wuffs_base__status
wuffs_png__decoder__filter_and_swizzle__choosy_default(
    wuffs_png__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__slice_u8 a_workbuf) {
  wuffs_base__pixel_format v_dst_pixfmt = {0};
  uint32_t v_dst_bits_per_pixel = 0;
  uint64_t v_dst_bytes_per_pixel = 0;
  uint64_t v_dst_bytes_per_row = 0;
  wuffs_base__slice_u8 v_dst_palette = {0};
  wuffs_base__table_u8 v_tab = {0};
  uint32_t v_y = 0;
  wuffs_base__slice_u8 v_dst = {0};
  uint8_t v_filter = 0;
  wuffs_base__slice_u8 v_curr_row = {0};
  wuffs_base__slice_u8 v_prev_row = {0};

  v_dst_pixfmt = wuffs_base__pixel_buffer__pixel_format(a_dst);
  v_dst_bits_per_pixel = wuffs_base__pixel_format__bits_per_pixel(&v_dst_pixfmt);
  if ((v_dst_bits_per_pixel & 7) != 0) {
    return wuffs_base__make_status(wuffs_base__error__unsupported_option);
  }
  v_dst_bytes_per_pixel = ((uint64_t)((v_dst_bits_per_pixel / 8)));
  v_dst_bytes_per_row = (((uint64_t)(self->private_impl.f_width)) * v_dst_bytes_per_pixel);
  v_dst_palette = wuffs_base__pixel_buffer__palette_or_else(a_dst, wuffs_base__make_slice_u8(self->private_data.f_dst_palette, 1024));
  v_tab = wuffs_base__pixel_buffer__plane(a_dst, 0);
  while (v_y < self->private_impl.f_height) {
    v_dst = wuffs_base__table_u8__row(v_tab, v_y);
    if (v_dst_bytes_per_row < ((uint64_t)(v_dst.len))) {
      v_dst = wuffs_base__slice_u8__subslice_j(v_dst, v_dst_bytes_per_row);
    }
    if (1 > ((uint64_t)(a_workbuf.len))) {
      return wuffs_base__make_status(wuffs_png__error__internal_error_inconsistent_workbuf_length);
    }
    v_filter = a_workbuf.ptr[0];
    a_workbuf = wuffs_base__slice_u8__subslice_i(a_workbuf, 1);
    if (self->private_impl.f_pass_bytes_per_row > ((uint64_t)(a_workbuf.len))) {
      return wuffs_base__make_status(wuffs_png__error__internal_error_inconsistent_workbuf_length);
    }
    v_curr_row = wuffs_base__slice_u8__subslice_j(a_workbuf, self->private_impl.f_pass_bytes_per_row);
    a_workbuf = wuffs_base__slice_u8__subslice_i(a_workbuf, self->private_impl.f_pass_bytes_per_row);
    if (v_filter == 0) {
    } else if (v_filter == 1) {
      wuffs_png__decoder__filter_1(self, v_curr_row);
    } else if (v_filter == 2) {
      wuffs_png__decoder__filter_2(self, v_curr_row, v_prev_row);
    } else if (v_filter == 3) {
      wuffs_png__decoder__filter_3(self, v_curr_row, v_prev_row);
    } else if (v_filter == 4) {
      wuffs_png__decoder__filter_4(self, v_curr_row, v_prev_row);
    } else {
      return wuffs_base__make_status(wuffs_png__error__bad_filter);
    }
    wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, v_dst, v_dst_palette, v_curr_row);
    v_prev_row = v_curr_row;
    v_y += 1;
  }
  return wuffs_base__make_status(NULL);
}

// -------- func png.decoder.filter_and_swizzle_tricky

static wuffs_base__status
wuffs_png__decoder__filter_and_swizzle_tricky(
    wuffs_png__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__slice_u8 a_workbuf) {
  wuffs_base__pixel_format v_dst_pixfmt = {0};
  uint32_t v_dst_bits_per_pixel = 0;
  uint64_t v_dst_bytes_per_pixel = 0;
  uint64_t v_dst_bytes_per_row = 0;
  wuffs_base__slice_u8 v_dst_palette = {0};
  wuffs_base__table_u8 v_tab = {0};
  uint64_t v_src_bytes_per_pixel = 0;
  uint32_t v_x = 0;
  uint32_t v_y = 0;
  uint64_t v_i = 0;
  wuffs_base__slice_u8 v_dst = {0};
  uint8_t v_filter = 0;
  wuffs_base__slice_u8 v_s = {0};
  wuffs_base__slice_u8 v_curr_row = {0};
  wuffs_base__slice_u8 v_prev_row = {0};
  uint8_t v_bits_unpacked[8] = {0};
  uint8_t v_bits_packed = 0;
  uint8_t v_packs_remaining = 0;
  uint8_t v_multiplier = 0;
  uint8_t v_shift = 0;

  v_dst_pixfmt = wuffs_base__pixel_buffer__pixel_format(a_dst);
  v_dst_bits_per_pixel = wuffs_base__pixel_format__bits_per_pixel(&v_dst_pixfmt);
  if ((v_dst_bits_per_pixel & 7) != 0) {
    return wuffs_base__make_status(wuffs_base__error__unsupported_option);
  }
  v_dst_bytes_per_pixel = ((uint64_t)((v_dst_bits_per_pixel / 8)));
  v_dst_bytes_per_row = (((uint64_t)(self->private_impl.f_width)) * v_dst_bytes_per_pixel);
  v_dst_palette = wuffs_base__pixel_buffer__palette_or_else(a_dst, wuffs_base__make_slice_u8(self->private_data.f_dst_palette, 1024));
  v_tab = wuffs_base__pixel_buffer__plane(a_dst, 0);
  v_src_bytes_per_pixel = 1;
  if (self->private_impl.f_depth >= 8) {
    v_src_bytes_per_pixel = (((uint64_t)(WUFFS_PNG__NUM_CHANNELS[self->private_impl.f_color_type])) * ((uint64_t)((self->private_impl.f_depth >> 3))));
  }
  v_bits_unpacked[0] = 255;
  v_bits_unpacked[1] = 255;
  v_bits_unpacked[2] = 255;
  v_bits_unpacked[3] = 255;
  v_bits_unpacked[4] = 255;
  v_bits_unpacked[5] = 255;
  v_bits_unpacked[6] = 255;
  v_bits_unpacked[7] = 255;
  v_y = ((uint32_t)(WUFFS_PNG__INTERLACING[self->private_impl.f_interlace_pass][5]));
  while (v_y < self->private_impl.f_height) {
    v_dst = wuffs_base__table_u8__row(v_tab, v_y);
    if (v_dst_bytes_per_row < ((uint64_t)(v_dst.len))) {
      v_dst = wuffs_base__slice_u8__subslice_j(v_dst, v_dst_bytes_per_row);
    }
    if (1 > ((uint64_t)(a_workbuf.len))) {
      return wuffs_base__make_status(wuffs_png__error__internal_error_inconsistent_workbuf_length);
    }
    v_filter = a_workbuf.ptr[0];
    a_workbuf = wuffs_base__slice_u8__subslice_i(a_workbuf, 1);
    if (self->private_impl.f_pass_bytes_per_row > ((uint64_t)(a_workbuf.len))) {
      return wuffs_base__make_status(wuffs_png__error__internal_error_inconsistent_workbuf_length);
    }
    v_curr_row = wuffs_base__slice_u8__subslice_j(a_workbuf, self->private_impl.f_pass_bytes_per_row);
    a_workbuf = wuffs_base__slice_u8__subslice_i(a_workbuf, self->private_impl.f_pass_bytes_per_row);
    if (v_filter == 0) {
    } else if (v_filter == 1) {
      wuffs_png__decoder__filter_1(self, v_curr_row);
    } else if (v_filter == 2) {
      wuffs_png__decoder__filter_2(self, v_curr_row, v_prev_row);
    } else if (v_filter == 3) {
      wuffs_png__decoder__filter_3(self, v_curr_row, v_prev_row);
    } else if (v_filter == 4) {
      wuffs_png__decoder__filter_4(self, v_curr_row, v_prev_row);
    } else {
      return wuffs_base__make_status(wuffs_png__error__bad_filter);
    }
    v_s = v_curr_row;
    v_x = ((uint32_t)(WUFFS_PNG__INTERLACING[self->private_impl.f_interlace_pass][2]));
    if (self->private_impl.f_depth == 8) {
      while (v_x < self->private_impl.f_width) {
        v_i = (((uint64_t)(v_x)) * v_dst_bytes_per_pixel);
        if (v_i <= ((uint64_t)(v_dst.len))) {
          if (self->private_impl.f_color_type == 4) {
            if (2 <= ((uint64_t)(v_s.len))) {
              v_bits_unpacked[0] = v_s.ptr[0];
              v_bits_unpacked[1] = v_s.ptr[0];
              v_bits_unpacked[2] = v_s.ptr[0];
              v_bits_unpacked[3] = v_s.ptr[1];
              v_s = wuffs_base__slice_u8__subslice_i(v_s, 2);
              wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, wuffs_base__slice_u8__subslice_i(v_dst, v_i), v_dst_palette, wuffs_base__make_slice_u8(v_bits_unpacked, 4));
            }
          } else if (v_src_bytes_per_pixel <= ((uint64_t)(v_s.len))) {
            wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, wuffs_base__slice_u8__subslice_i(v_dst, v_i), v_dst_palette, wuffs_base__slice_u8__subslice_j(v_s, v_src_bytes_per_pixel));
            v_s = wuffs_base__slice_u8__subslice_i(v_s, v_src_bytes_per_pixel);
          }
        }
        v_x += (((uint32_t)(1)) << WUFFS_PNG__INTERLACING[self->private_impl.f_interlace_pass][0]);
      }
    } else if (self->private_impl.f_depth < 8) {
      v_multiplier = 1;
      if (self->private_impl.f_color_type == 0) {
        v_multiplier = WUFFS_PNG__LOW_BIT_DEPTH_MULTIPLIERS[self->private_impl.f_depth];
      }
      v_shift = ((8 - self->private_impl.f_depth) & 7);
      v_packs_remaining = 0;
      while (v_x < self->private_impl.f_width) {
        v_i = (((uint64_t)(v_x)) * v_dst_bytes_per_pixel);
        if (v_i <= ((uint64_t)(v_dst.len))) {
          if ((v_packs_remaining == 0) && (1 <= ((uint64_t)(v_s.len)))) {
            v_packs_remaining = WUFFS_PNG__LOW_BIT_DEPTH_NUM_PACKS[self->private_impl.f_depth];
            v_bits_packed = v_s.ptr[0];
            v_s = wuffs_base__slice_u8__subslice_i(v_s, 1);
          }
          v_bits_unpacked[0] = ((uint8_t)((v_bits_packed >> v_shift) * v_multiplier));
          v_bits_packed = ((uint8_t)(v_bits_packed << self->private_impl.f_depth));
          v_packs_remaining = ((uint8_t)(v_packs_remaining - 1));
          wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, wuffs_base__slice_u8__subslice_i(v_dst, v_i), v_dst_palette, wuffs_base__make_slice_u8(v_bits_unpacked, 1));
        }
        v_x += (((uint32_t)(1)) << WUFFS_PNG__INTERLACING[self->private_impl.f_interlace_pass][0]);
      }
    } else {
      while (v_x < self->private_impl.f_width) {
        v_i = (((uint64_t)(v_x)) * v_dst_bytes_per_pixel);
        if (v_i <= ((uint64_t)(v_dst.len))) {
          if (self->private_impl.f_color_type == 0) {
            if (2 <= ((uint64_t)(v_s.len))) {
              v_bits_unpacked[0] = v_s.ptr[1];
              v_bits_unpacked[1] = v_s.ptr[0];
              v_bits_unpacked[2] = v_s.ptr[1];
              v_bits_unpacked[3] = v_s.ptr[0];
              v_bits_unpacked[4] = v_s.ptr[1];
              v_bits_unpacked[5] = v_s.ptr[0];
              v_s = wuffs_base__slice_u8__subslice_i(v_s, 2);
            }
          } else if (self->private_impl.f_color_type == 2) {
            if (6 <= ((uint64_t)(v_s.len))) {
              v_bits_unpacked[0] = v_s.ptr[5];
              v_bits_unpacked[1] = v_s.ptr[4];
              v_bits_unpacked[2] = v_s.ptr[3];
              v_bits_unpacked[3] = v_s.ptr[2];
              v_bits_unpacked[4] = v_s.ptr[1];
              v_bits_unpacked[5] = v_s.ptr[0];
              v_s = wuffs_base__slice_u8__subslice_i(v_s, 6);
            }
          } else if (self->private_impl.f_color_type == 4) {
            if (4 <= ((uint64_t)(v_s.len))) {
              v_bits_unpacked[0] = v_s.ptr[1];
              v_bits_unpacked[1] = v_s.ptr[0];
              v_bits_unpacked[2] = v_s.ptr[1];
              v_bits_unpacked[3] = v_s.ptr[0];
              v_bits_unpacked[4] = v_s.ptr[1];
              v_bits_unpacked[5] = v_s.ptr[0];
              v_bits_unpacked[6] = v_s.ptr[3];
              v_bits_unpacked[7] = v_s.ptr[2];
              v_s = wuffs_base__slice_u8__subslice_i(v_s, 4);
            }
          } else {
            if (8 <= ((uint64_t)(v_s.len))) {
              v_bits_unpacked[0] = v_s.ptr[5];
              v_bits_unpacked[1] = v_s.ptr[4];
              v_bits_unpacked[2] = v_s.ptr[3];
              v_bits_unpacked[3] = v_s.ptr[2];
              v_bits_unpacked[4] = v_s.ptr[1];
              v_bits_unpacked[5] = v_s.ptr[0];
              v_bits_unpacked[6] = v_s.ptr[7];
              v_bits_unpacked[7] = v_s.ptr[6];
              v_s = wuffs_base__slice_u8__subslice_i(v_s, 8);
            }
          }
          wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, wuffs_base__slice_u8__subslice_i(v_dst, v_i), v_dst_palette, wuffs_base__make_slice_u8(v_bits_unpacked, 8));
        }
        v_x += (((uint32_t)(1)) << WUFFS_PNG__INTERLACING[self->private_impl.f_interlace_pass][0]);
      }
    }
    v_prev_row = v_curr_row;
    v_y += (((uint32_t)(1)) << WUFFS_PNG__INTERLACING[self->private_impl.f_interlace_pass][3]);
  }
  return wuffs_base__make_status(NULL);
}

#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__PNG)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__WBMP)

// ---------------- Status Codes Implementations

const char wuffs_wbmp__error__bad_header[] = "#wbmp: bad header";

// ---------------- Private Consts

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

// ---------------- VTables

const wuffs_base__image_decoder__func_ptrs
wuffs_wbmp__decoder__func_ptrs_for__wuffs_base__image_decoder = {
  (wuffs_base__status(*)(void*,
      wuffs_base__pixel_buffer*,
      wuffs_base__io_buffer*,
      wuffs_base__pixel_blend,
      wuffs_base__slice_u8,
      wuffs_base__decode_frame_options*))(&wuffs_wbmp__decoder__decode_frame),
  (wuffs_base__status(*)(void*,
      wuffs_base__frame_config*,
      wuffs_base__io_buffer*))(&wuffs_wbmp__decoder__decode_frame_config),
  (wuffs_base__status(*)(void*,
      wuffs_base__image_config*,
      wuffs_base__io_buffer*))(&wuffs_wbmp__decoder__decode_image_config),
  (wuffs_base__rect_ie_u32(*)(const void*))(&wuffs_wbmp__decoder__frame_dirty_rect),
  (uint32_t(*)(const void*))(&wuffs_wbmp__decoder__num_animation_loops),
  (uint64_t(*)(const void*))(&wuffs_wbmp__decoder__num_decoded_frame_configs),
  (uint64_t(*)(const void*))(&wuffs_wbmp__decoder__num_decoded_frames),
  (wuffs_base__status(*)(void*,
      uint64_t,
      uint64_t))(&wuffs_wbmp__decoder__restart_frame),
  (wuffs_base__empty_struct(*)(void*,
      uint32_t,
      bool))(&wuffs_wbmp__decoder__set_quirk_enabled),
  (wuffs_base__empty_struct(*)(void*,
      uint32_t,
      bool))(&wuffs_wbmp__decoder__set_report_metadata),
  (wuffs_base__status(*)(void*,
      wuffs_base__io_buffer*,
      wuffs_base__more_information*,
      wuffs_base__io_buffer*))(&wuffs_wbmp__decoder__tell_me_more),
  (wuffs_base__range_ii_u64(*)(const void*))(&wuffs_wbmp__decoder__workbuf_len),
};

// ---------------- Initializer Implementations

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
wuffs_wbmp__decoder__initialize(
    wuffs_wbmp__decoder* self,
    size_t sizeof_star_self,
    uint64_t wuffs_version,
    uint32_t options){
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (sizeof(*self) != sizeof_star_self) {
    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
  }
  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
  }

  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
    // The whole point of this if-check is to detect an uninitialized *self.
    // We disable the warning on GCC. Clang-5.0 does not have this warning.
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
    if (self->private_impl.magic != 0) {
      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
    }
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
  } else {
    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    } else {
      memset(&(self->private_impl), 0, sizeof(self->private_impl));
    }
  }

  self->private_impl.magic = WUFFS_BASE__MAGIC;
  self->private_impl.vtable_for__wuffs_base__image_decoder.vtable_name =
      wuffs_base__image_decoder__vtable_name;
  self->private_impl.vtable_for__wuffs_base__image_decoder.function_pointers =
      (const void*)(&wuffs_wbmp__decoder__func_ptrs_for__wuffs_base__image_decoder);
  return wuffs_base__make_status(NULL);
}

wuffs_wbmp__decoder*
wuffs_wbmp__decoder__alloc() {
  wuffs_wbmp__decoder* x =
      (wuffs_wbmp__decoder*)(calloc(sizeof(wuffs_wbmp__decoder), 1));
  if (!x) {
    return NULL;
  }
  if (wuffs_wbmp__decoder__initialize(
      x, sizeof(wuffs_wbmp__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
    free(x);
    return NULL;
  }
  return x;
}

size_t
sizeof__wuffs_wbmp__decoder() {
  return sizeof(wuffs_wbmp__decoder);
}

// ---------------- Function Implementations

// -------- func wbmp.decoder.set_quirk_enabled

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_wbmp__decoder__set_quirk_enabled(
    wuffs_wbmp__decoder* self,
    uint32_t a_quirk,
    bool a_enabled) {
  return wuffs_base__make_empty_struct();
}

// -------- func wbmp.decoder.decode_image_config

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_wbmp__decoder__decode_image_config(
    wuffs_wbmp__decoder* self,
    wuffs_base__image_config* a_dst,
    wuffs_base__io_buffer* a_src) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 1)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint8_t v_c = 0;
  uint32_t v_i = 0;
  uint32_t v_x32 = 0;
  uint64_t v_x64 = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_image_config[0];
  if (coro_susp_point) {
    v_i = self->private_data.s_decode_image_config[0].v_i;
    v_x32 = self->private_data.s_decode_image_config[0].v_x32;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_call_sequence != 0) {
      status = wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
      goto exit;
    }
    v_i = 0;
    while (v_i < 2) {
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
          goto suspend;
        }
        uint8_t t_0 = *iop_a_src++;
        v_c = t_0;
      }
      if (v_c != 0) {
        status = wuffs_base__make_status(wuffs_wbmp__error__bad_header);
        goto exit;
      }
      v_i += 1;
    }
    v_i = 0;
    while (v_i < 2) {
      v_x32 = 0;
      while (true) {
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
            goto suspend;
          }
          uint8_t t_1 = *iop_a_src++;
          v_c = t_1;
        }
        v_x32 |= ((uint32_t)((v_c & 127)));
        if ((v_c >> 7) == 0) {
          goto label__0__break;
        }
        v_x64 = (((uint64_t)(v_x32)) << 7);
        if (v_x64 > 4294967295) {
          status = wuffs_base__make_status(wuffs_wbmp__error__bad_header);
          goto exit;
        }
        v_x32 = ((uint32_t)(v_x64));
      }
      label__0__break:;
      if (v_i == 0) {
        self->private_impl.f_width = v_x32;
      } else {
        self->private_impl.f_height = v_x32;
      }
      v_i += 1;
    }
    self->private_impl.f_frame_config_io_position = wuffs_base__u64__sat_add(a_src->meta.pos, ((uint64_t)(iop_a_src - io0_a_src)));
    if (a_dst != NULL) {
      wuffs_base__image_config__set(
          a_dst,
          2198077448,
          0,
          self->private_impl.f_width,
          self->private_impl.f_height,
          self->private_impl.f_frame_config_io_position,
          true);
    }
    self->private_impl.f_call_sequence = 3;

    goto ok;
    ok:
    self->private_impl.p_decode_image_config[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_image_config[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 1 : 0;
  self->private_data.s_decode_image_config[0].v_i = v_i;
  self->private_data.s_decode_image_config[0].v_x32 = v_x32;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func wbmp.decoder.decode_frame_config

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_wbmp__decoder__decode_frame_config(
    wuffs_wbmp__decoder* self,
    wuffs_base__frame_config* a_dst,
    wuffs_base__io_buffer* a_src) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 2)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_frame_config[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_call_sequence < 3) {
      if (a_src) {
        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
      }
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      status = wuffs_wbmp__decoder__decode_image_config(self, NULL, a_src);
      if (a_src) {
        iop_a_src = a_src->data.ptr + a_src->meta.ri;
      }
      if (status.repr) {
        goto suspend;
      }
    } else if (self->private_impl.f_call_sequence == 3) {
      if (self->private_impl.f_frame_config_io_position != wuffs_base__u64__sat_add(a_src->meta.pos, ((uint64_t)(iop_a_src - io0_a_src)))) {
        status = wuffs_base__make_status(wuffs_base__error__bad_restart);
        goto exit;
      }
    } else if (self->private_impl.f_call_sequence == 4) {
      self->private_impl.f_call_sequence = 255;
      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
      goto ok;
    } else {
      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
      goto ok;
    }
    if (a_dst != NULL) {
      wuffs_base__frame_config__set(
          a_dst,
          wuffs_base__utility__make_rect_ie_u32(
          0,
          0,
          self->private_impl.f_width,
          self->private_impl.f_height),
          ((wuffs_base__flicks)(0)),
          0,
          self->private_impl.f_frame_config_io_position,
          0,
          true,
          false,
          4278190080);
    }
    self->private_impl.f_call_sequence = 4;

    goto ok;
    ok:
    self->private_impl.p_decode_frame_config[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_frame_config[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 2 : 0;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func wbmp.decoder.decode_frame

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_wbmp__decoder__decode_frame(
    wuffs_wbmp__decoder* self,
    wuffs_base__pixel_buffer* a_dst,
    wuffs_base__io_buffer* a_src,
    wuffs_base__pixel_blend a_blend,
    wuffs_base__slice_u8 a_workbuf,
    wuffs_base__decode_frame_options* a_opts) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_dst || !a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 3)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  wuffs_base__status v_status = wuffs_base__make_status(NULL);
  wuffs_base__pixel_format v_dst_pixfmt = {0};
  uint32_t v_dst_bits_per_pixel = 0;
  uint64_t v_dst_bytes_per_pixel = 0;
  uint64_t v_dst_x_in_bytes = 0;
  uint32_t v_dst_x = 0;
  uint32_t v_dst_y = 0;
  wuffs_base__table_u8 v_tab = {0};
  wuffs_base__slice_u8 v_dst = {0};
  uint8_t v_src[1] = {0};
  uint8_t v_c = 0;

  const uint8_t* iop_a_src = NULL;
  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_frame[0];
  if (coro_susp_point) {
    v_dst_bytes_per_pixel = self->private_data.s_decode_frame[0].v_dst_bytes_per_pixel;
    v_dst_x = self->private_data.s_decode_frame[0].v_dst_x;
    v_dst_y = self->private_data.s_decode_frame[0].v_dst_y;
    memcpy(v_src, self->private_data.s_decode_frame[0].v_src, sizeof(v_src));
    v_c = self->private_data.s_decode_frame[0].v_c;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_call_sequence < 4) {
      if (a_src) {
        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
      }
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      status = wuffs_wbmp__decoder__decode_frame_config(self, NULL, a_src);
      if (a_src) {
        iop_a_src = a_src->data.ptr + a_src->meta.ri;
      }
      if (status.repr) {
        goto suspend;
      }
    } else if (self->private_impl.f_call_sequence == 4) {
    } else {
      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
      goto ok;
    }
    v_status = wuffs_base__pixel_swizzler__prepare(&self->private_impl.f_swizzler,
        wuffs_base__pixel_buffer__pixel_format(a_dst),
        wuffs_base__pixel_buffer__palette(a_dst),
        wuffs_base__utility__make_pixel_format(536870920),
        wuffs_base__utility__empty_slice_u8(),
        a_blend);
    if ( ! wuffs_base__status__is_ok(&v_status)) {
      status = v_status;
      if (wuffs_base__status__is_error(&status)) {
        goto exit;
      } else if (wuffs_base__status__is_suspension(&status)) {
        status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
        goto exit;
      }
      goto ok;
    }
    v_dst_pixfmt = wuffs_base__pixel_buffer__pixel_format(a_dst);
    v_dst_bits_per_pixel = wuffs_base__pixel_format__bits_per_pixel(&v_dst_pixfmt);
    if ((v_dst_bits_per_pixel & 7) != 0) {
      status = wuffs_base__make_status(wuffs_base__error__unsupported_option);
      goto exit;
    }
    v_dst_bytes_per_pixel = ((uint64_t)((v_dst_bits_per_pixel / 8)));
    if (self->private_impl.f_width > 0) {
      v_tab = wuffs_base__pixel_buffer__plane(a_dst, 0);
      while (v_dst_y < self->private_impl.f_height) {
        v_dst = wuffs_base__table_u8__row(v_tab, v_dst_y);
        v_dst_x = 0;
        while (v_dst_x < self->private_impl.f_width) {
          if ((v_dst_x & 7) == 0) {
            while (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
              WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
              v_tab = wuffs_base__pixel_buffer__plane(a_dst, 0);
              v_dst = wuffs_base__table_u8__row(v_tab, v_dst_y);
              v_dst_x_in_bytes = (((uint64_t)(v_dst_x)) * v_dst_bytes_per_pixel);
              if (v_dst_x_in_bytes <= ((uint64_t)(v_dst.len))) {
                v_dst = wuffs_base__slice_u8__subslice_i(v_dst, v_dst_x_in_bytes);
              }
            }
            v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
            iop_a_src += 1;
          }
          if ((v_c & 128) == 0) {
            v_src[0] = 0;
          } else {
            v_src[0] = 255;
          }
          v_c = ((uint8_t)(((((uint32_t)(v_c)) << 1) & 255)));
          wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, v_dst, wuffs_base__utility__empty_slice_u8(), wuffs_base__make_slice_u8(v_src, 1));
          if (v_dst_bytes_per_pixel <= ((uint64_t)(v_dst.len))) {
            v_dst = wuffs_base__slice_u8__subslice_i(v_dst, v_dst_bytes_per_pixel);
          }
          v_dst_x += 1;
        }
        v_dst_y += 1;
      }
    }
    self->private_impl.f_call_sequence = 255;

    goto ok;
    ok:
    self->private_impl.p_decode_frame[0] = 0;
    goto exit;
  }

  goto suspend;
  suspend:
  self->private_impl.p_decode_frame[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 3 : 0;
  self->private_data.s_decode_frame[0].v_dst_bytes_per_pixel = v_dst_bytes_per_pixel;
  self->private_data.s_decode_frame[0].v_dst_x = v_dst_x;
  self->private_data.s_decode_frame[0].v_dst_y = v_dst_y;
  memcpy(self->private_data.s_decode_frame[0].v_src, v_src, sizeof(v_src));
  self->private_data.s_decode_frame[0].v_c = v_c;

  goto exit;
  exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func wbmp.decoder.frame_dirty_rect

WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
wuffs_wbmp__decoder__frame_dirty_rect(
    const wuffs_wbmp__decoder* self) {
  if (!self) {
    return wuffs_base__utility__empty_rect_ie_u32();
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__empty_rect_ie_u32();
  }

  return wuffs_base__utility__make_rect_ie_u32(
      0,
      0,
      self->private_impl.f_width,
      self->private_impl.f_height);
}

// -------- func wbmp.decoder.num_animation_loops

WUFFS_BASE__MAYBE_STATIC uint32_t
wuffs_wbmp__decoder__num_animation_loops(
    const wuffs_wbmp__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  return 0;
}

// -------- func wbmp.decoder.num_decoded_frame_configs

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_wbmp__decoder__num_decoded_frame_configs(
    const wuffs_wbmp__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  if (self->private_impl.f_call_sequence > 3) {
    return 1;
  }
  return 0;
}

// -------- func wbmp.decoder.num_decoded_frames

WUFFS_BASE__MAYBE_STATIC uint64_t
wuffs_wbmp__decoder__num_decoded_frames(
    const wuffs_wbmp__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  if (self->private_impl.f_call_sequence > 4) {
    return 1;
  }
  return 0;
}

// -------- func wbmp.decoder.restart_frame

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_wbmp__decoder__restart_frame(
    wuffs_wbmp__decoder* self,
    uint64_t a_index,
    uint64_t a_io_position) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }

  if (self->private_impl.f_call_sequence < 3) {
    return wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
  }
  if (a_index != 0) {
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  self->private_impl.f_call_sequence = 3;
  self->private_impl.f_frame_config_io_position = a_io_position;
  return wuffs_base__make_status(NULL);
}

// -------- func wbmp.decoder.set_report_metadata

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
wuffs_wbmp__decoder__set_report_metadata(
    wuffs_wbmp__decoder* self,
    uint32_t a_fourcc,
    bool a_report) {
  return wuffs_base__make_empty_struct();
}

// -------- func wbmp.decoder.tell_me_more

WUFFS_BASE__MAYBE_STATIC wuffs_base__status
wuffs_wbmp__decoder__tell_me_more(
    wuffs_wbmp__decoder* self,
    wuffs_base__io_buffer* a_dst,
    wuffs_base__more_information* a_minfo,
    wuffs_base__io_buffer* a_src) {
  if (!self) {
    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_status(
        (self->private_impl.magic == WUFFS_BASE__DISABLED)
        ? wuffs_base__error__disabled_by_previous_error
        : wuffs_base__error__initialize_not_called);
  }
  if (!a_dst || !a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 4)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = wuffs_base__make_status(NULL);

  status = wuffs_base__make_status(wuffs_base__error__no_more_information);
  goto exit;

  goto ok;
  ok:
  goto exit;
  exit:
  if (wuffs_base__status__is_error(&status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func wbmp.decoder.workbuf_len

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
wuffs_wbmp__decoder__workbuf_len(
    const wuffs_wbmp__decoder* self) {
  if (!self) {
    return wuffs_base__utility__empty_range_ii_u64();
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__empty_range_ii_u64();
  }

  return wuffs_base__utility__make_range_ii_u64(0, 0);
}

#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__WBMP)

#if defined(__cplusplus) && (__cplusplus >= 201103L)

// ---------------- Auxiliary - Base

// Auxiliary code is discussed at
// https://github.com/google/wuffs/blob/main/doc/note/auxiliary-code.md

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__AUX__BASE)

namespace wuffs_aux {

namespace sync_io {

// --------

IOBuffer*  //
Input::BringsItsOwnIOBuffer() {
  return nullptr;
}

// --------

FileInput::FileInput(FILE* f) : m_f(f) {}

std::string  //
FileInput::CopyIn(IOBuffer* dst) {
  if (!m_f) {
    return "wuffs_aux::sync_io::FileInput: nullptr file";
  } else if (!dst) {
    return "wuffs_aux::sync_io::FileInput: nullptr IOBuffer";
  } else if (dst->meta.closed) {
    return "wuffs_aux::sync_io::FileInput: end of file";
  } else {
    dst->compact();
    size_t n = fread(dst->writer_pointer(), 1, dst->writer_length(), m_f);
    dst->meta.wi += n;
    dst->meta.closed = feof(m_f);
    if (ferror(m_f)) {
      return "wuffs_aux::sync_io::FileInput: error reading file";
    }
  }
  return "";
}

// --------

MemoryInput::MemoryInput(const char* ptr, size_t len)
    : m_io(wuffs_base__ptr_u8__reader(
          static_cast<uint8_t*>(static_cast<void*>(const_cast<char*>(ptr))),
          len,
          true)) {}

MemoryInput::MemoryInput(const uint8_t* ptr, size_t len)
    : m_io(wuffs_base__ptr_u8__reader(const_cast<uint8_t*>(ptr), len, true)) {}

IOBuffer*  //
MemoryInput::BringsItsOwnIOBuffer() {
  return &m_io;
}

std::string  //
MemoryInput::CopyIn(IOBuffer* dst) {
  if (!dst) {
    return "wuffs_aux::sync_io::MemoryInput: nullptr IOBuffer";
  } else if (dst->meta.closed) {
    return "wuffs_aux::sync_io::MemoryInput: end of file";
  } else if (wuffs_base__slice_u8__overlaps(dst->data, m_io.data)) {
    // Treat m_io's data as immutable, so don't compact dst or otherwise write
    // to it.
    return "wuffs_aux::sync_io::MemoryInput: overlapping buffers";
  } else {
    dst->compact();
    size_t nd = dst->writer_length();
    size_t ns = m_io.reader_length();
    size_t n = (nd < ns) ? nd : ns;
    memcpy(dst->writer_pointer(), m_io.reader_pointer(), n);
    m_io.meta.ri += n;
    dst->meta.wi += n;
    dst->meta.closed = m_io.reader_length() == 0;
  }
  return "";
}

// --------

}  // namespace sync_io

}  // namespace wuffs_aux

#endif  // !defined(WUFFS_CONFIG__MODULES) ||
        // defined(WUFFS_CONFIG__MODULE__AUX__BASE)

// ---------------- Auxiliary - CBOR

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__AUX__CBOR)

#include <utility>

namespace wuffs_aux {

DecodeCborResult::DecodeCborResult(std::string&& error_message0,
                                   uint64_t cursor_position0)
    : error_message(std::move(error_message0)),
      cursor_position(cursor_position0) {}

void  //
DecodeCborCallbacks::Done(DecodeCborResult& result,
                          sync_io::Input& input,
                          IOBuffer& buffer) {}

DecodeCborResult  //
DecodeCbor(DecodeCborCallbacks& callbacks,
           sync_io::Input& input,
           wuffs_base__slice_u32 quirks) {
  // Prepare the wuffs_base__io_buffer and the resultant error_message.
  wuffs_base__io_buffer* io_buf = input.BringsItsOwnIOBuffer();
  wuffs_base__io_buffer fallback_io_buf = wuffs_base__empty_io_buffer();
  std::unique_ptr<uint8_t[]> fallback_io_array(nullptr);
  if (!io_buf) {
    fallback_io_array = std::unique_ptr<uint8_t[]>(new uint8_t[4096]);
    fallback_io_buf = wuffs_base__ptr_u8__writer(fallback_io_array.get(), 4096);
    io_buf = &fallback_io_buf;
  }
  // cursor_index is discussed at
  // https://nigeltao.github.io/blog/2020/jsonptr.html#the-cursor-index
  size_t cursor_index = 0;
  std::string ret_error_message;
  std::string io_error_message;

  do {
    // Prepare the low-level CBOR decoder.
    wuffs_cbor__decoder::unique_ptr dec = wuffs_cbor__decoder::alloc();
    if (!dec) {
      ret_error_message = "wuffs_aux::CborDecoder: out of memory";
      goto done;
    }
    for (size_t i = 0; i < quirks.len; i++) {
      dec->set_quirk_enabled(quirks.ptr[i], true);
    }

    // Prepare the wuffs_base__tok_buffer. 256 tokens is 2KiB.
    wuffs_base__token tok_array[256];
    wuffs_base__token_buffer tok_buf =
        wuffs_base__slice_token__writer(wuffs_base__make_slice_token(
            &tok_array[0], (sizeof(tok_array) / sizeof(tok_array[0]))));
    wuffs_base__status tok_status = wuffs_base__make_status(nullptr);

    // Prepare other state.
    uint32_t depth = 0;
    std::string str;
    int64_t extension_category = 0;
    uint64_t extension_detail = 0;

    // Valid token's VBCs range in 0 ..= 15. Values over that are for tokens
    // from outside of the base package, such as the CBOR package.
    constexpr int64_t EXT_CAT__CBOR_TAG = 16;

    // Loop, doing these two things:
    //  1. Get the next token.
    //  2. Process that token.
    while (true) {
      // 1. Get the next token.

      while (tok_buf.meta.ri >= tok_buf.meta.wi) {
        if (tok_status.repr == nullptr) {
          // No-op.
        } else if (tok_status.repr == wuffs_base__suspension__short_write) {
          tok_buf.compact();
        } else if (tok_status.repr == wuffs_base__suspension__short_read) {
          // Read from input to io_buf.
          if (!io_error_message.empty()) {
            ret_error_message = std::move(io_error_message);
            goto done;
          } else if (cursor_index != io_buf->meta.ri) {
            ret_error_message =
                "wuffs_aux::CborDecoder: internal error: bad cursor_index";
            goto done;
          } else if (io_buf->meta.closed) {
            ret_error_message =
                "wuffs_aux::CborDecoder: internal error: io_buf is closed";
            goto done;
          }
          io_buf->compact();
          if (io_buf->meta.wi >= io_buf->data.len) {
            ret_error_message =
                "wuffs_aux::CborDecoder: internal error: io_buf is full";
            goto done;
          }
          cursor_index = io_buf->meta.ri;
          io_error_message = input.CopyIn(io_buf);
        } else {
          ret_error_message = tok_status.message();
          goto done;
        }

        if (WUFFS_CBOR__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE != 0) {
          ret_error_message =
              "wuffs_aux::CborDecoder: internal error: bad WORKBUF_LEN";
          goto done;
        }
        wuffs_base__slice_u8 work_buf = wuffs_base__empty_slice_u8();
        tok_status = dec->decode_tokens(&tok_buf, io_buf, work_buf);
      }

      wuffs_base__token token = tok_buf.data.ptr[tok_buf.meta.ri++];
      uint64_t token_len = token.length();
      if ((io_buf->meta.ri < cursor_index) ||
          ((io_buf->meta.ri - cursor_index) < token_len)) {
        ret_error_message =
            "wuffs_aux::CborDecoder: internal error: bad token indexes";
        goto done;
      }
      uint8_t* token_ptr = io_buf->data.ptr + cursor_index;
      cursor_index += static_cast<size_t>(token_len);

      // 2. Process that token.

      uint64_t vbd = token.value_base_detail();

      if (extension_category != 0) {
        int64_t ext = token.value_extension();
        if ((ext >= 0) && !token.continued()) {
          extension_detail = (extension_detail
                              << WUFFS_BASE__TOKEN__VALUE_EXTENSION__NUM_BITS) |
                             static_cast<uint64_t>(ext);
          switch (extension_category) {
            case WUFFS_BASE__TOKEN__VBC__INLINE_INTEGER_SIGNED:
              extension_category = 0;
              ret_error_message =
                  callbacks.AppendI64(static_cast<int64_t>(extension_detail));
              goto parsed_a_value;
            case WUFFS_BASE__TOKEN__VBC__INLINE_INTEGER_UNSIGNED:
              extension_category = 0;
              ret_error_message = callbacks.AppendU64(extension_detail);
              goto parsed_a_value;
            case EXT_CAT__CBOR_TAG:
              extension_category = 0;
              ret_error_message = callbacks.AppendCborTag(extension_detail);
              if (!ret_error_message.empty()) {
                goto done;
              }
              continue;
          }
        }
        ret_error_message =
            "wuffs_aux::CborDecoder: internal error: bad extended token";
        goto done;
      }

      switch (token.value_base_category()) {
        case WUFFS_BASE__TOKEN__VBC__FILLER:
          continue;

        case WUFFS_BASE__TOKEN__VBC__STRUCTURE: {
          if (vbd & WUFFS_BASE__TOKEN__VBD__STRUCTURE__PUSH) {
            ret_error_message = callbacks.Push(static_cast<uint32_t>(vbd));
            if (!ret_error_message.empty()) {
              goto done;
            }
            depth++;
            continue;
          }
          ret_error_message = callbacks.Pop(static_cast<uint32_t>(vbd));
          depth--;
          goto parsed_a_value;
        }

        case WUFFS_BASE__TOKEN__VBC__STRING: {
          if (vbd & WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_0_DST_1_SRC_DROP) {
            // No-op.
          } else if (vbd &
                     WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_1_DST_1_SRC_COPY) {
            const char* ptr =  // Convert from (uint8_t*).
                static_cast<const char*>(static_cast<void*>(token_ptr));
            str.append(ptr, static_cast<size_t>(token_len));
          } else {
            goto fail;
          }
          if (token.continued()) {
            continue;
          }
          ret_error_message =
              (vbd & WUFFS_BASE__TOKEN__VBD__STRING__CHAIN_MUST_BE_UTF_8)
                  ? callbacks.AppendTextString(std::move(str))
                  : callbacks.AppendByteString(std::move(str));
          str.clear();
          goto parsed_a_value;
        }

        case WUFFS_BASE__TOKEN__VBC__UNICODE_CODE_POINT: {
          uint8_t u[WUFFS_BASE__UTF_8__BYTE_LENGTH__MAX_INCL];
          size_t n = wuffs_base__utf_8__encode(
              wuffs_base__make_slice_u8(
                  &u[0], WUFFS_BASE__UTF_8__BYTE_LENGTH__MAX_INCL),
              static_cast<uint32_t>(vbd));
          const char* ptr =  // Convert from (uint8_t*).
              static_cast<const char*>(static_cast<void*>(&u[0]));
          str.append(ptr, n);
          if (token.continued()) {
            continue;
          }
          goto fail;
        }

        case WUFFS_BASE__TOKEN__VBC__LITERAL: {
          if (vbd & WUFFS_BASE__TOKEN__VBD__LITERAL__NULL) {
            ret_error_message = callbacks.AppendNull();
          } else if (vbd & WUFFS_BASE__TOKEN__VBD__LITERAL__UNDEFINED) {
            ret_error_message = callbacks.AppendUndefined();
          } else {
            ret_error_message = callbacks.AppendBool(
                vbd & WUFFS_BASE__TOKEN__VBD__LITERAL__TRUE);
          }
          goto parsed_a_value;
        }

        case WUFFS_BASE__TOKEN__VBC__NUMBER: {
          const uint64_t cfp_fbbe_fifb =
              WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_FLOATING_POINT |
              WUFFS_BASE__TOKEN__VBD__NUMBER__FORMAT_BINARY_BIG_ENDIAN |
              WUFFS_BASE__TOKEN__VBD__NUMBER__FORMAT_IGNORE_FIRST_BYTE;
          if ((vbd & cfp_fbbe_fifb) == cfp_fbbe_fifb) {
            double f;
            switch (token_len) {
              case 3:
                f = wuffs_base__ieee_754_bit_representation__from_u16_to_f64(
                    wuffs_base__peek_u16be__no_bounds_check(token_ptr + 1));
                break;
              case 5:
                f = wuffs_base__ieee_754_bit_representation__from_u32_to_f64(
                    wuffs_base__peek_u32be__no_bounds_check(token_ptr + 1));
                break;
              case 9:
                f = wuffs_base__ieee_754_bit_representation__from_u64_to_f64(
                    wuffs_base__peek_u64be__no_bounds_check(token_ptr + 1));
                break;
              default:
                goto fail;
            }
            ret_error_message = callbacks.AppendF64(f);
            goto parsed_a_value;
          }
          goto fail;
        }

        case WUFFS_BASE__TOKEN__VBC__INLINE_INTEGER_SIGNED: {
          if (token.continued()) {
            extension_category = WUFFS_BASE__TOKEN__VBC__INLINE_INTEGER_SIGNED;
            extension_detail =
                static_cast<uint64_t>(token.value_base_detail__sign_extended());
            continue;
          }
          ret_error_message =
              callbacks.AppendI64(token.value_base_detail__sign_extended());
          goto parsed_a_value;
        }

        case WUFFS_BASE__TOKEN__VBC__INLINE_INTEGER_UNSIGNED: {
          if (token.continued()) {
            extension_category =
                WUFFS_BASE__TOKEN__VBC__INLINE_INTEGER_UNSIGNED;
            extension_detail = vbd;
            continue;
          }
          ret_error_message = callbacks.AppendU64(vbd);
          goto parsed_a_value;
        }
      }

      if (token.value_major() == WUFFS_CBOR__TOKEN_VALUE_MAJOR) {
        uint64_t value_minor = token.value_minor();
        if (value_minor & WUFFS_CBOR__TOKEN_VALUE_MINOR__MINUS_1_MINUS_X) {
          if (token_len == 9) {
            ret_error_message = callbacks.AppendMinus1MinusX(
                wuffs_base__peek_u64be__no_bounds_check(token_ptr + 1));
            goto parsed_a_value;
          }
        } else if (value_minor & WUFFS_CBOR__TOKEN_VALUE_MINOR__SIMPLE_VALUE) {
          ret_error_message =
              callbacks.AppendCborSimpleValue(static_cast<uint8_t>(
                  value_minor & WUFFS_CBOR__TOKEN_VALUE_MINOR__DETAIL_MASK));
          goto parsed_a_value;
        } else if (value_minor & WUFFS_CBOR__TOKEN_VALUE_MINOR__TAG) {
          if (token.continued()) {
            extension_category = EXT_CAT__CBOR_TAG;
            extension_detail =
                value_minor & WUFFS_CBOR__TOKEN_VALUE_MINOR__DETAIL_MASK;
            continue;
          }
          ret_error_message = callbacks.AppendCborTag(
              value_minor & WUFFS_CBOR__TOKEN_VALUE_MINOR__DETAIL_MASK);
          if (!ret_error_message.empty()) {
            goto done;
          }
          continue;
        }
      }

    fail:
      ret_error_message =
          "wuffs_aux::CborDecoder: internal error: unexpected token";
      goto done;

    parsed_a_value:
      if (!ret_error_message.empty() || (depth == 0)) {
        goto done;
      }
    }
  } while (false);

done:
  DecodeCborResult result(
      std::move(ret_error_message),
      wuffs_base__u64__sat_add(io_buf->meta.pos, cursor_index));
  callbacks.Done(result, input, *io_buf);
  return result;
}

}  // namespace wuffs_aux

#endif  // !defined(WUFFS_CONFIG__MODULES) ||
        // defined(WUFFS_CONFIG__MODULE__AUX__CBOR)

// ---------------- Auxiliary - Image

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__AUX__IMAGE)

#include <utility>

namespace wuffs_aux {

DecodeImageResult::DecodeImageResult(MemOwner&& pixbuf_mem_owner0,
                                     wuffs_base__slice_u8 pixbuf_mem_slice0,
                                     wuffs_base__pixel_buffer pixbuf0,
                                     std::string&& error_message0)
    : pixbuf_mem_owner(std::move(pixbuf_mem_owner0)),
      pixbuf_mem_slice(pixbuf_mem_slice0),
      pixbuf(pixbuf0),
      error_message(std::move(error_message0)) {}

DecodeImageResult::DecodeImageResult(std::string&& error_message0)
    : pixbuf_mem_owner(nullptr, &free),
      pixbuf_mem_slice(wuffs_base__empty_slice_u8()),
      pixbuf(wuffs_base__null_pixel_buffer()),
      error_message(std::move(error_message0)) {}

DecodeImageCallbacks::AllocResult::AllocResult(MemOwner&& mem_owner0,
                                               wuffs_base__slice_u8 mem_slice0)
    : mem_owner(std::move(mem_owner0)),
      mem_slice(mem_slice0),
      error_message("") {}

DecodeImageCallbacks::AllocResult::AllocResult(std::string&& error_message0)
    : mem_owner(nullptr, &free),
      mem_slice(wuffs_base__empty_slice_u8()),
      error_message(std::move(error_message0)) {}

DecodeImageCallbacks::AllocResult  //
DecodeImageCallbacks::OnImageConfig(
    const wuffs_base__image_config& image_config) {
  uint32_t w = image_config.pixcfg.width();
  uint32_t h = image_config.pixcfg.height();
  if ((w == 0) || (h == 0)) {
    return AllocResult("");
  }
  uint64_t len = image_config.pixcfg.pixbuf_len();
  if ((len == 0) || (SIZE_MAX < len)) {
    return AllocResult(DecodeImage_UnsupportedPixelConfiguration);
  }
  void* ptr = calloc((size_t)len, 1);
  if (!ptr) {
    return AllocResult(DecodeImage_OutOfMemory);
  }
  return AllocResult(MemOwner(ptr, &free),
                     wuffs_base__make_slice_u8((uint8_t*)ptr, (size_t)len));
}

DecodeImageCallbacks::AllocResult  //
DecodeImageCallbacks::AllocWorkbuf(wuffs_base__range_ii_u64 len) {
  if (len.max_incl == 0) {
    return DecodeImageCallbacks::AllocResult("");
  } else if (SIZE_MAX < len.max_incl) {
    return DecodeImageCallbacks::AllocResult(DecodeImage_OutOfMemory);
  }
  void* p = calloc((size_t)len.max_incl, 1);
  if (!p) {
    return DecodeImageCallbacks::AllocResult(DecodeImage_OutOfMemory);
  }
  return DecodeImageCallbacks::AllocResult(
      MemOwner(p, &free),
      wuffs_base__make_slice_u8((uint8_t*)p, (size_t)len.max_incl));
}

void  //
DecodeImageCallbacks::Done(
    DecodeImageResult& result,
    sync_io::Input& input,
    IOBuffer& buffer,
    wuffs_base__image_decoder::unique_ptr image_decoder) {}

const char DecodeImage_BufferIsTooShort[] =  //
    "wuffs_aux::DecodeImage: buffer is too short";
const char DecodeImage_MaxInclDimensionExceeded[] =  //
    "wuffs_aux::DecodeImage: max_incl_dimension exceeded";
const char DecodeImage_OutOfMemory[] =  //
    "wuffs_aux::DecodeImage: out of memory";
const char DecodeImage_UnexpectedEndOfFile[] =  //
    "wuffs_aux::DecodeImage: unexpected end of file";
const char DecodeImage_UnsupportedImageFormat[] =  //
    "wuffs_aux::DecodeImage: unsupported image format";
const char DecodeImage_UnsupportedPixelBlend[] =  //
    "wuffs_aux::DecodeImage: unsupported pixel blend";
const char DecodeImage_UnsupportedPixelConfiguration[] =  //
    "wuffs_aux::DecodeImage: unsupported pixel configuration";
const char DecodeImage_UnsupportedPixelFormat[] =  //
    "wuffs_aux::DecodeImage: unsupported pixel format";

// --------

namespace {

std::string  //
DecodeImageAdvanceIOBuf(sync_io::Input& input,
                        wuffs_base__io_buffer& io_buf,
                        bool compactable,
                        uint64_t min_excl_pos,
                        uint64_t pos) {
  if ((pos <= min_excl_pos) || (pos < io_buf.reader_position())) {
    // Redirects must go forward.
    return DecodeImage_UnsupportedImageFormat;
  }
  while (true) {
    uint64_t relative_pos = pos - io_buf.reader_position();
    if (relative_pos <= io_buf.reader_length()) {
      io_buf.meta.ri += (size_t)relative_pos;
      break;
    } else if (io_buf.meta.closed) {
      return DecodeImage_UnexpectedEndOfFile;
    }
    io_buf.meta.ri = io_buf.meta.wi;
    if (compactable) {
      io_buf.compact();
    }
    std::string error_message = input.CopyIn(&io_buf);
    if (!error_message.empty()) {
      return error_message;
    }
  }
  return "";
}

DecodeImageResult  //
DecodeImage0(wuffs_base__image_decoder::unique_ptr& image_decoder,
             DecodeImageCallbacks& callbacks,
             sync_io::Input& input,
             wuffs_base__io_buffer& io_buf,
             uint32_t override_pixel_format_repr,
             wuffs_base__pixel_blend pixel_blend,
             uint32_t max_incl_dimension) {
  // Check args.
  switch (override_pixel_format_repr) {
    case 0:
    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
    case WUFFS_BASE__PIXEL_FORMAT__BGR:
    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
      break;
    default:
      return DecodeImageResult(DecodeImage_UnsupportedPixelFormat);
  }
  switch (pixel_blend) {
    case WUFFS_BASE__PIXEL_BLEND__SRC:
    case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
      break;
    default:
      return DecodeImageResult(DecodeImage_UnsupportedPixelBlend);
  }

  wuffs_base__image_config image_config = wuffs_base__null_image_config();
  uint64_t start_pos = io_buf.reader_position();
  bool redirected = false;
  int32_t fourcc = 0;
redirect:
  do {
    // Determine the image format.
    if (!redirected) {
      while (true) {
        fourcc = wuffs_base__magic_number_guess_fourcc(io_buf.reader_slice());
        if (fourcc > 0) {
          break;
        } else if ((fourcc == 0) && (io_buf.reader_length() >= 64)) {
          break;
        } else if (io_buf.meta.closed || (io_buf.writer_length() == 0)) {
          fourcc = 0;
          break;
        }
        std::string error_message = input.CopyIn(&io_buf);
        if (!error_message.empty()) {
          return DecodeImageResult(std::move(error_message));
        }
      }
    } else {
      wuffs_base__io_buffer empty = wuffs_base__empty_io_buffer();
      wuffs_base__more_information minfo = wuffs_base__empty_more_information();
      wuffs_base__status tmm_status =
          image_decoder->tell_me_more(&empty, &minfo, &io_buf);
      if (!tmm_status.is_ok()) {
        return DecodeImageResult(tmm_status.message());
      }
      if (minfo.flavor != WUFFS_BASE__MORE_INFORMATION__FLAVOR__IO_REDIRECT) {
        return DecodeImageResult(DecodeImage_UnsupportedImageFormat);
      }
      uint64_t pos = minfo.io_redirect__range().min_incl;
      std::string error_message = DecodeImageAdvanceIOBuf(
          input, io_buf, !input.BringsItsOwnIOBuffer(), start_pos, pos);
      if (!error_message.empty()) {
        return DecodeImageResult(std::move(error_message));
      }
      fourcc = (int32_t)(minfo.io_redirect__fourcc());
      if (fourcc == 0) {
        return DecodeImageResult(DecodeImage_UnsupportedImageFormat);
      }
      image_decoder.reset();
    }

    // Make the image decoder.
    image_decoder = callbacks.OnImageFormat(
        (uint32_t)fourcc,
        fourcc ? wuffs_base__empty_slice_u8() : io_buf.reader_slice());
    if (!image_decoder) {
      return DecodeImageResult(DecodeImage_UnsupportedImageFormat);
    }

    // Decode the image config.
    while (true) {
      wuffs_base__status id_dic_status =
          image_decoder->decode_image_config(&image_config, &io_buf);
      if (id_dic_status.repr == NULL) {
        break;
      } else if (id_dic_status.repr == wuffs_base__note__i_o_redirect) {
        if (redirected) {
          return DecodeImageResult(DecodeImage_UnsupportedImageFormat);
        }
        redirected = true;
        goto redirect;
      } else if (id_dic_status.repr != wuffs_base__suspension__short_read) {
        return DecodeImageResult(id_dic_status.message());
      } else if (io_buf.meta.closed) {
        return DecodeImageResult(DecodeImage_UnexpectedEndOfFile);
      } else {
        std::string error_message = input.CopyIn(&io_buf);
        if (!error_message.empty()) {
          return DecodeImageResult(std::move(error_message));
        }
      }
    }
  } while (false);

  // Apply the override pixel format.
  uint32_t w = image_config.pixcfg.width();
  uint32_t h = image_config.pixcfg.height();
  if ((w > max_incl_dimension) || (h > max_incl_dimension)) {
    return DecodeImageResult(DecodeImage_MaxInclDimensionExceeded);
  }
  if (override_pixel_format_repr != 0) {
    image_config.pixcfg.set(override_pixel_format_repr,
                            WUFFS_BASE__PIXEL_SUBSAMPLING__NONE, w, h);
  }

  // Allocate the pixel buffer.
  uint64_t pixbuf_len_min_incl = 0;
  if ((w > 0) && (h > 0)) {
    pixbuf_len_min_incl = image_config.pixcfg.pixbuf_len();
    if (pixbuf_len_min_incl == 0) {
      return DecodeImageResult(DecodeImage_UnsupportedPixelFormat);
    }
  }
  DecodeImageCallbacks::AllocResult oic_result =
      callbacks.OnImageConfig(image_config);
  if (!oic_result.error_message.empty()) {
    return DecodeImageResult(std::move(oic_result.error_message));
  } else if (oic_result.mem_slice.len < pixbuf_len_min_incl) {
    return DecodeImageResult(DecodeImage_BufferIsTooShort);
  }
  wuffs_base__pixel_buffer pixel_buffer;
  wuffs_base__status pb_sfs_status =
      pixel_buffer.set_from_slice(&image_config.pixcfg, oic_result.mem_slice);
  if (!pb_sfs_status.is_ok()) {
    return DecodeImageResult(pb_sfs_status.message());
  }

  // Allocate the work buffer.
  wuffs_base__range_ii_u64 workbuf_len = image_decoder->workbuf_len();
  DecodeImageCallbacks::AllocResult alloc_workbuf_result =
      callbacks.AllocWorkbuf(workbuf_len);
  if (!alloc_workbuf_result.error_message.empty()) {
    return DecodeImageResult(std::move(alloc_workbuf_result.error_message));
  } else if (alloc_workbuf_result.mem_slice.len < workbuf_len.min_incl) {
    return DecodeImageResult(DecodeImage_BufferIsTooShort);
  }

  // Decode the frame config.
  wuffs_base__frame_config frame_config = wuffs_base__null_frame_config();
  while (true) {
    wuffs_base__status id_dfc_status =
        image_decoder->decode_frame_config(&frame_config, &io_buf);
    if (id_dfc_status.repr == NULL) {
      break;
    } else if (id_dfc_status.repr != wuffs_base__suspension__short_read) {
      return DecodeImageResult(id_dfc_status.message());
    } else if (io_buf.meta.closed) {
      return DecodeImageResult(DecodeImage_UnexpectedEndOfFile);
    } else {
      std::string error_message = input.CopyIn(&io_buf);
      if (!error_message.empty()) {
        return DecodeImageResult(std::move(error_message));
      }
    }
  }

  // Decode the frame (the pixels).
  //
  // From here on, always returns the pixel_buffer. If we get this far, we can
  // still display a partial image, even if we encounter an error.
  std::string message("");
  if ((pixel_blend == WUFFS_BASE__PIXEL_BLEND__SRC_OVER) &&
      frame_config.overwrite_instead_of_blend()) {
    pixel_blend = WUFFS_BASE__PIXEL_BLEND__SRC;
  }
  while (true) {
    wuffs_base__status id_df_status =
        image_decoder->decode_frame(&pixel_buffer, &io_buf, pixel_blend,
                                    alloc_workbuf_result.mem_slice, NULL);
    if (id_df_status.repr == NULL) {
      break;
    } else if (id_df_status.repr != wuffs_base__suspension__short_read) {
      message = id_df_status.message();
      break;
    } else if (io_buf.meta.closed) {
      message = DecodeImage_UnexpectedEndOfFile;
      break;
    } else {
      std::string error_message = input.CopyIn(&io_buf);
      if (!error_message.empty()) {
        message = std::move(error_message);
        break;
      }
    }
  }
  return DecodeImageResult(std::move(oic_result.mem_owner),
                           oic_result.mem_slice, pixel_buffer,
                           std::move(message));
}

}  // namespace

DecodeImageResult  //
DecodeImage(DecodeImageCallbacks& callbacks,
            sync_io::Input& input,
            uint32_t override_pixel_format_repr,
            wuffs_base__pixel_blend pixel_blend,
            uint32_t max_incl_dimension) {
  wuffs_base__io_buffer* io_buf = input.BringsItsOwnIOBuffer();
  wuffs_base__io_buffer fallback_io_buf = wuffs_base__empty_io_buffer();
  std::unique_ptr<uint8_t[]> fallback_io_array(nullptr);
  if (!io_buf) {
    fallback_io_array = std::unique_ptr<uint8_t[]>(new uint8_t[32768]);
    fallback_io_buf =
        wuffs_base__ptr_u8__writer(fallback_io_array.get(), 32768);
    io_buf = &fallback_io_buf;
  }

  wuffs_base__image_decoder::unique_ptr image_decoder(nullptr, &free);
  DecodeImageResult result =
      DecodeImage0(image_decoder, callbacks, input, *io_buf,
                   override_pixel_format_repr, pixel_blend, max_incl_dimension);
  callbacks.Done(result, input, *io_buf, std::move(image_decoder));
  return result;
}

}  // namespace wuffs_aux

#endif  // !defined(WUFFS_CONFIG__MODULES) ||
        // defined(WUFFS_CONFIG__MODULE__AUX__IMAGE)

// ---------------- Auxiliary - JSON

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__AUX__JSON)

#include <utility>

namespace wuffs_aux {

DecodeJsonResult::DecodeJsonResult(std::string&& error_message0,
                                   uint64_t cursor_position0)
    : error_message(std::move(error_message0)),
      cursor_position(cursor_position0) {}

void  //
DecodeJsonCallbacks::Done(DecodeJsonResult& result,
                          sync_io::Input& input,
                          IOBuffer& buffer) {}

const char DecodeJson_BadJsonPointer[] =
    "wuffs_aux::DecodeJson: bad JSON Pointer";
const char DecodeJson_NoMatch[] = "wuffs_aux::DecodeJson: no match";

// --------

#define WUFFS_AUX__DECODE_JSON__GET_THE_NEXT_TOKEN                       \
  while (tok_buf.meta.ri >= tok_buf.meta.wi) {                           \
    if (tok_status.repr == nullptr) {                                    \
    } else if (tok_status.repr == wuffs_base__suspension__short_write) { \
      tok_buf.compact();                                                 \
    } else if (tok_status.repr == wuffs_base__suspension__short_read) {  \
      if (!io_error_message.empty()) {                                   \
        ret_error_message = std::move(io_error_message);                 \
        goto done;                                                       \
      } else if (cursor_index != io_buf->meta.ri) {                      \
        ret_error_message =                                              \
            "wuffs_aux::DecodeJson: internal error: bad cursor_index";   \
        goto done;                                                       \
      } else if (io_buf->meta.closed) {                                  \
        ret_error_message =                                              \
            "wuffs_aux::DecodeJson: internal error: io_buf is closed";   \
        goto done;                                                       \
      }                                                                  \
      io_buf->compact();                                                 \
      if (io_buf->meta.wi >= io_buf->data.len) {                         \
        ret_error_message =                                              \
            "wuffs_aux::DecodeJson: internal error: io_buf is full";     \
        goto done;                                                       \
      }                                                                  \
      cursor_index = io_buf->meta.ri;                                    \
      io_error_message = input.CopyIn(io_buf);                           \
    } else {                                                             \
      ret_error_message = tok_status.message();                          \
      goto done;                                                         \
    }                                                                    \
    if (WUFFS_JSON__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE != 0) {      \
      ret_error_message =                                                \
          "wuffs_aux::DecodeJson: internal error: bad WORKBUF_LEN";      \
      goto done;                                                         \
    }                                                                    \
    wuffs_base__slice_u8 work_buf = wuffs_base__empty_slice_u8();        \
    tok_status = dec->decode_tokens(&tok_buf, io_buf, work_buf);         \
  }                                                                      \
  wuffs_base__token token = tok_buf.data.ptr[tok_buf.meta.ri++];         \
  uint64_t token_len = token.length();                                   \
  if ((io_buf->meta.ri < cursor_index) ||                                \
      ((io_buf->meta.ri - cursor_index) < token_len)) {                  \
    ret_error_message =                                                  \
        "wuffs_aux::DecodeJson: internal error: bad token indexes";      \
    goto done;                                                           \
  }                                                                      \
  uint8_t* token_ptr = io_buf->data.ptr + cursor_index;                  \
  (void)(token_ptr);                                                     \
  cursor_index += static_cast<size_t>(token_len)

// --------

namespace {

// DecodeJson_SplitJsonPointer returns ("bar", 8) for ("/foo/bar/b~1z/qux", 5,
// etc). It returns a 0 size_t when s has invalid JSON Pointer syntax.
//
// The string returned is unescaped. If calling it again, this time with i=8,
// the "b~1z" substring would be returned as "b/z".
std::pair<std::string, size_t>  //
DecodeJson_SplitJsonPointer(std::string& s,
                            size_t i,
                            bool allow_tilde_n_tilde_r_tilde_t) {
  std::string fragment;
  while (i < s.size()) {
    char c = s[i];
    if (c == '/') {
      break;
    } else if (c != '~') {
      fragment.push_back(c);
      i++;
      continue;
    }
    i++;
    if (i >= s.size()) {
      return std::make_pair(std::string(), 0);
    }
    c = s[i];
    if (c == '0') {
      fragment.push_back('~');
      i++;
      continue;
    } else if (c == '1') {
      fragment.push_back('/');
      i++;
      continue;
    } else if (allow_tilde_n_tilde_r_tilde_t) {
      if (c == 'n') {
        fragment.push_back('\n');
        i++;
        continue;
      } else if (c == 'r') {
        fragment.push_back('\r');
        i++;
        continue;
      } else if (c == 't') {
        fragment.push_back('\t');
        i++;
        continue;
      }
    }
    return std::make_pair(std::string(), 0);
  }
  return std::make_pair(std::move(fragment), i);
}

// --------

std::string  //
DecodeJson_WalkJsonPointerFragment(wuffs_base__token_buffer& tok_buf,
                                   wuffs_base__status& tok_status,
                                   wuffs_json__decoder::unique_ptr& dec,
                                   wuffs_base__io_buffer* io_buf,
                                   std::string& io_error_message,
                                   size_t& cursor_index,
                                   sync_io::Input& input,
                                   std::string& json_pointer_fragment) {
  std::string ret_error_message;
  while (true) {
    WUFFS_AUX__DECODE_JSON__GET_THE_NEXT_TOKEN;

    int64_t vbc = token.value_base_category();
    uint64_t vbd = token.value_base_detail();
    if (vbc == WUFFS_BASE__TOKEN__VBC__FILLER) {
      continue;
    } else if ((vbc != WUFFS_BASE__TOKEN__VBC__STRUCTURE) ||
               !(vbd & WUFFS_BASE__TOKEN__VBD__STRUCTURE__PUSH)) {
      return DecodeJson_NoMatch;
    } else if (vbd & WUFFS_BASE__TOKEN__VBD__STRUCTURE__TO_LIST) {
      goto do_list;
    }
    goto do_dict;
  }

do_dict:
  // Alternate between these two things:
  //  1. Decode the next dict key (a string). If it matches the fragment, we're
  //    done (success). If we've reached the dict's end (VBD__STRUCTURE__POP)
  //    so that there was no next dict key, we're done (failure).
  //  2. Otherwise, skip the next dict value.
  while (true) {
    for (std::string str; true;) {
      WUFFS_AUX__DECODE_JSON__GET_THE_NEXT_TOKEN;

      int64_t vbc = token.value_base_category();
      uint64_t vbd = token.value_base_detail();
      switch (vbc) {
        case WUFFS_BASE__TOKEN__VBC__FILLER:
          continue;

        case WUFFS_BASE__TOKEN__VBC__STRUCTURE:
          if (vbd & WUFFS_BASE__TOKEN__VBD__STRUCTURE__PUSH) {
            goto fail;
          }
          return DecodeJson_NoMatch;

        case WUFFS_BASE__TOKEN__VBC__STRING: {
          if (vbd & WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_0_DST_1_SRC_DROP) {
            // No-op.
          } else if (vbd &
                     WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_1_DST_1_SRC_COPY) {
            const char* ptr =  // Convert from (uint8_t*).
                static_cast<const char*>(static_cast<void*>(token_ptr));
            str.append(ptr, static_cast<size_t>(token_len));
          } else {
            goto fail;
          }
          break;
        }

        case WUFFS_BASE__TOKEN__VBC__UNICODE_CODE_POINT: {
          uint8_t u[WUFFS_BASE__UTF_8__BYTE_LENGTH__MAX_INCL];
          size_t n = wuffs_base__utf_8__encode(
              wuffs_base__make_slice_u8(
                  &u[0], WUFFS_BASE__UTF_8__BYTE_LENGTH__MAX_INCL),
              static_cast<uint32_t>(vbd));
          const char* ptr =  // Convert from (uint8_t*).
              static_cast<const char*>(static_cast<void*>(&u[0]));
          str.append(ptr, n);
          break;
        }

        default:
          goto fail;
      }

      if (token.continued()) {
        continue;
      }
      if (str == json_pointer_fragment) {
        return "";
      }
      goto skip_the_next_dict_value;
    }

  skip_the_next_dict_value:
    for (uint32_t skip_depth = 0; true;) {
      WUFFS_AUX__DECODE_JSON__GET_THE_NEXT_TOKEN;

      int64_t vbc = token.value_base_category();
      uint64_t vbd = token.value_base_detail();
      if (token.continued() || (vbc == WUFFS_BASE__TOKEN__VBC__FILLER)) {
        continue;
      } else if (vbc == WUFFS_BASE__TOKEN__VBC__STRUCTURE) {
        if (vbd & WUFFS_BASE__TOKEN__VBD__STRUCTURE__PUSH) {
          skip_depth++;
          continue;
        }
        skip_depth--;
      }

      if (skip_depth == 0) {
        break;
      }
    }  // skip_the_next_dict_value
  }    // do_dict

do_list:
  do {
    wuffs_base__result_u64 result_u64 = wuffs_base__parse_number_u64(
        wuffs_base__make_slice_u8(
            static_cast<uint8_t*>(static_cast<void*>(
                const_cast<char*>(json_pointer_fragment.data()))),
            json_pointer_fragment.size()),
        WUFFS_BASE__PARSE_NUMBER_XXX__DEFAULT_OPTIONS);
    if (!result_u64.status.is_ok()) {
      return DecodeJson_NoMatch;
    }
    uint64_t remaining = result_u64.value;
    if (remaining == 0) {
      goto check_that_a_value_follows;
    }
    for (uint32_t skip_depth = 0; true;) {
      WUFFS_AUX__DECODE_JSON__GET_THE_NEXT_TOKEN;

      int64_t vbc = token.value_base_category();
      uint64_t vbd = token.value_base_detail();
      if (token.continued() || (vbc == WUFFS_BASE__TOKEN__VBC__FILLER)) {
        continue;
      } else if (vbc == WUFFS_BASE__TOKEN__VBC__STRUCTURE) {
        if (vbd & WUFFS_BASE__TOKEN__VBD__STRUCTURE__PUSH) {
          skip_depth++;
          continue;
        }
        if (skip_depth == 0) {
          return DecodeJson_NoMatch;
        }
        skip_depth--;
      }

      if (skip_depth > 0) {
        continue;
      }
      remaining--;
      if (remaining == 0) {
        goto check_that_a_value_follows;
      }
    }
  } while (false);  // do_list

check_that_a_value_follows:
  while (true) {
    WUFFS_AUX__DECODE_JSON__GET_THE_NEXT_TOKEN;

    int64_t vbc = token.value_base_category();
    uint64_t vbd = token.value_base_detail();
    if (vbc == WUFFS_BASE__TOKEN__VBC__FILLER) {
      continue;
    }

    // Undo the last part of WUFFS_AUX__DECODE_JSON__GET_THE_NEXT_TOKEN, so that
    // we're only peeking at the next token.
    tok_buf.meta.ri--;
    cursor_index -= static_cast<size_t>(token_len);

    if ((vbc == WUFFS_BASE__TOKEN__VBC__STRUCTURE) &&
        (vbd & WUFFS_BASE__TOKEN__VBD__STRUCTURE__POP)) {
      return DecodeJson_NoMatch;
    }
    return "";
  }  // check_that_a_value_follows

fail:
  return "wuffs_aux::DecodeJson: internal error: unexpected token";
done:
  return ret_error_message;
}

}  // namespace

// --------

DecodeJsonResult  //
DecodeJson(DecodeJsonCallbacks& callbacks,
           sync_io::Input& input,
           wuffs_base__slice_u32 quirks,
           std::string json_pointer) {
  // Prepare the wuffs_base__io_buffer and the resultant error_message.
  wuffs_base__io_buffer* io_buf = input.BringsItsOwnIOBuffer();
  wuffs_base__io_buffer fallback_io_buf = wuffs_base__empty_io_buffer();
  std::unique_ptr<uint8_t[]> fallback_io_array(nullptr);
  if (!io_buf) {
    fallback_io_array = std::unique_ptr<uint8_t[]>(new uint8_t[4096]);
    fallback_io_buf = wuffs_base__ptr_u8__writer(fallback_io_array.get(), 4096);
    io_buf = &fallback_io_buf;
  }
  // cursor_index is discussed at
  // https://nigeltao.github.io/blog/2020/jsonptr.html#the-cursor-index
  size_t cursor_index = 0;
  std::string ret_error_message;
  std::string io_error_message;

  do {
    // Prepare the low-level JSON decoder.
    wuffs_json__decoder::unique_ptr dec = wuffs_json__decoder::alloc();
    if (!dec) {
      ret_error_message = "wuffs_aux::DecodeJson: out of memory";
      goto done;
    }
    bool allow_tilde_n_tilde_r_tilde_t = false;
    for (size_t i = 0; i < quirks.len; i++) {
      dec->set_quirk_enabled(quirks.ptr[i], true);
      if (quirks.ptr[i] ==
          WUFFS_JSON__QUIRK_JSON_POINTER_ALLOW_TILDE_N_TILDE_R_TILDE_T) {
        allow_tilde_n_tilde_r_tilde_t = true;
      }
    }

    // Prepare the wuffs_base__tok_buffer. 256 tokens is 2KiB.
    wuffs_base__token tok_array[256];
    wuffs_base__token_buffer tok_buf =
        wuffs_base__slice_token__writer(wuffs_base__make_slice_token(
            &tok_array[0], (sizeof(tok_array) / sizeof(tok_array[0]))));
    wuffs_base__status tok_status = wuffs_base__make_status(nullptr);

    // Prepare other state.
    uint32_t depth = 0;
    std::string str;

    // Walk the (optional) JSON Pointer.
    for (size_t i = 0; i < json_pointer.size();) {
      if (json_pointer[i] != '/') {
        ret_error_message = DecodeJson_BadJsonPointer;
        goto done;
      }
      std::pair<std::string, size_t> split = DecodeJson_SplitJsonPointer(
          json_pointer, i + 1, allow_tilde_n_tilde_r_tilde_t);
      i = std::move(split.second);
      if (i == 0) {
        ret_error_message = DecodeJson_BadJsonPointer;
        goto done;
      }
      ret_error_message = DecodeJson_WalkJsonPointerFragment(
          tok_buf, tok_status, dec, io_buf, io_error_message, cursor_index,
          input, split.first);
      if (!ret_error_message.empty()) {
        goto done;
      }
    }

    // Loop, doing these two things:
    //  1. Get the next token.
    //  2. Process that token.
    while (true) {
      WUFFS_AUX__DECODE_JSON__GET_THE_NEXT_TOKEN;

      int64_t vbc = token.value_base_category();
      uint64_t vbd = token.value_base_detail();
      switch (vbc) {
        case WUFFS_BASE__TOKEN__VBC__FILLER:
          continue;

        case WUFFS_BASE__TOKEN__VBC__STRUCTURE: {
          if (vbd & WUFFS_BASE__TOKEN__VBD__STRUCTURE__PUSH) {
            ret_error_message = callbacks.Push(static_cast<uint32_t>(vbd));
            if (!ret_error_message.empty()) {
              goto done;
            }
            depth++;
            continue;
          }
          ret_error_message = callbacks.Pop(static_cast<uint32_t>(vbd));
          depth--;
          goto parsed_a_value;
        }

        case WUFFS_BASE__TOKEN__VBC__STRING: {
          if (vbd & WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_0_DST_1_SRC_DROP) {
            // No-op.
          } else if (vbd &
                     WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_1_DST_1_SRC_COPY) {
            const char* ptr =  // Convert from (uint8_t*).
                static_cast<const char*>(static_cast<void*>(token_ptr));
            str.append(ptr, static_cast<size_t>(token_len));
          } else {
            goto fail;
          }
          if (token.continued()) {
            continue;
          }
          ret_error_message = callbacks.AppendTextString(std::move(str));
          str.clear();
          goto parsed_a_value;
        }

        case WUFFS_BASE__TOKEN__VBC__UNICODE_CODE_POINT: {
          uint8_t u[WUFFS_BASE__UTF_8__BYTE_LENGTH__MAX_INCL];
          size_t n = wuffs_base__utf_8__encode(
              wuffs_base__make_slice_u8(
                  &u[0], WUFFS_BASE__UTF_8__BYTE_LENGTH__MAX_INCL),
              static_cast<uint32_t>(vbd));
          const char* ptr =  // Convert from (uint8_t*).
              static_cast<const char*>(static_cast<void*>(&u[0]));
          str.append(ptr, n);
          if (token.continued()) {
            continue;
          }
          goto fail;
        }

        case WUFFS_BASE__TOKEN__VBC__LITERAL: {
          ret_error_message =
              (vbd & WUFFS_BASE__TOKEN__VBD__LITERAL__NULL)
                  ? callbacks.AppendNull()
                  : callbacks.AppendBool(vbd &
                                         WUFFS_BASE__TOKEN__VBD__LITERAL__TRUE);
          goto parsed_a_value;
        }

        case WUFFS_BASE__TOKEN__VBC__NUMBER: {
          if (vbd & WUFFS_BASE__TOKEN__VBD__NUMBER__FORMAT_TEXT) {
            if (vbd & WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_INTEGER_SIGNED) {
              wuffs_base__result_i64 r = wuffs_base__parse_number_i64(
                  wuffs_base__make_slice_u8(token_ptr,
                                            static_cast<size_t>(token_len)),
                  WUFFS_BASE__PARSE_NUMBER_XXX__DEFAULT_OPTIONS);
              if (r.status.is_ok()) {
                ret_error_message = callbacks.AppendI64(r.value);
                goto parsed_a_value;
              }
            }
            if (vbd & WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_FLOATING_POINT) {
              wuffs_base__result_f64 r = wuffs_base__parse_number_f64(
                  wuffs_base__make_slice_u8(token_ptr,
                                            static_cast<size_t>(token_len)),
                  WUFFS_BASE__PARSE_NUMBER_XXX__DEFAULT_OPTIONS);
              if (r.status.is_ok()) {
                ret_error_message = callbacks.AppendF64(r.value);
                goto parsed_a_value;
              }
            }
          } else if (vbd & WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_NEG_INF) {
            ret_error_message = callbacks.AppendF64(
                wuffs_base__ieee_754_bit_representation__from_u64_to_f64(
                    0xFFF0000000000000ul));
            goto parsed_a_value;
          } else if (vbd & WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_POS_INF) {
            ret_error_message = callbacks.AppendF64(
                wuffs_base__ieee_754_bit_representation__from_u64_to_f64(
                    0x7FF0000000000000ul));
            goto parsed_a_value;
          } else if (vbd & WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_NEG_NAN) {
            ret_error_message = callbacks.AppendF64(
                wuffs_base__ieee_754_bit_representation__from_u64_to_f64(
                    0xFFFFFFFFFFFFFFFFul));
            goto parsed_a_value;
          } else if (vbd & WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_POS_NAN) {
            ret_error_message = callbacks.AppendF64(
                wuffs_base__ieee_754_bit_representation__from_u64_to_f64(
                    0x7FFFFFFFFFFFFFFFul));
            goto parsed_a_value;
          }
          goto fail;
        }
      }

    fail:
      ret_error_message =
          "wuffs_aux::DecodeJson: internal error: unexpected token";
      goto done;

    parsed_a_value:
      if (!ret_error_message.empty() || (depth == 0)) {
        goto done;
      }
    }
  } while (false);

done:
  DecodeJsonResult result(
      std::move(ret_error_message),
      wuffs_base__u64__sat_add(io_buf->meta.pos, cursor_index));
  callbacks.Done(result, input, *io_buf);
  return result;
}

#undef WUFFS_AUX__DECODE_JSON__GET_THE_NEXT_TOKEN

}  // namespace wuffs_aux

#endif  // !defined(WUFFS_CONFIG__MODULES) ||
        // defined(WUFFS_CONFIG__MODULE__AUX__JSON)

#endif  // defined(__cplusplus) && (__cplusplus >= 201103L)

#endif  // WUFFS_IMPLEMENTATION

#ifdef __clang__
#pragma clang diagnostic pop
#endif

#endif  // WUFFS_INCLUDE_GUARD