#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>

#ifdef __cplusplus
#if __cplusplus >= 201103L
#include <memory>
#else
#warning "Wuffs' C++ code requires -std=c++11 or later"
#endif

extern "C" {
#endif

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

// 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 ((uint64_t)0)
#define WUFFS_VERSION_MAJOR ((uint64_t)0)
#define WUFFS_VERSION_MINOR ((uint64_t)0)
#define WUFFS_VERSION_PATCH ((uint64_t)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"

// 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
#ifdef WUFFS_CONFIG__STATIC_FUNCTIONS
#define WUFFS_BASE__MAYBE_STATIC static
#else
#define WUFFS_BASE__MAYBE_STATIC
#endif

// --------

// 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

// Flags 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/master/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 {
  // 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 {
  // 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 {
  const char* vtable_name;
  const void* function_pointers;
} wuffs_base__vtable;

// --------

// See https://github.com/google/wuffs/blob/master/doc/note/statuses.md
typedef 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_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;

// --------

// FourCC constants.

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

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

// Portable Network Graphics.
#define WUFFS_BASE__FOURCC__PNG 0x504E4720

// Extensible Metadata Platform.
#define WUFFS_BASE__FOURCC__XMP 0x584D5020

// --------

// 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 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 {
  uint64_t hi;
  uint64_t lo;
} 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) {
  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.hi = (x1 * y1) + w2 + (w1 >> 32);
  o.lo = x * y;
  return o;
}

  // --------

#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__load_u8be__no_bounds_check \
  wuffs_base__load_u8__no_bounds_check
#define wuffs_base__load_u8le__no_bounds_check \
  wuffs_base__load_u8__no_bounds_check

static inline uint8_t  //
wuffs_base__load_u8__no_bounds_check(const uint8_t* p) {
  return p[0];
}

static inline uint16_t  //
wuffs_base__load_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__load_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__load_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__load_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__load_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__load_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__load_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__load_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__load_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__load_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__load_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__load_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__load_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__load_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__store_u8be__no_bounds_check \
  wuffs_base__store_u8__no_bounds_check
#define wuffs_base__store_u8le__no_bounds_check \
  wuffs_base__store_u8__no_bounds_check

static inline void  //
wuffs_base__store_u8__no_bounds_check(uint8_t* p, uint8_t x) {
  p[0] = x;
}

static inline void  //
wuffs_base__store_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__store_u16le__no_bounds_check(uint8_t* p, uint16_t x) {
  p[0] = (uint8_t)(x >> 0);
  p[1] = (uint8_t)(x >> 8);
}

static inline void  //
wuffs_base__store_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__store_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__store_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__store_u32le__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);
  p[3] = (uint8_t)(x >> 24);
}

static inline void  //
wuffs_base__store_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__store_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__store_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__store_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__store_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__store_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__store_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__store_u64le__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);
  p[7] = (uint8_t)(x >> 56);
}

// ---------------- 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__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;
}

// 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, 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, 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, j - i);
  }
  return wuffs_base__make_slice_u8(NULL, 0);
}

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

// See https://github.com/google/wuffs/blob/master/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 {
  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 {
  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__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__slice_u8 data;
  wuffs_base__io_buffer_meta meta;

#ifdef __cplusplus
  inline bool is_valid() const;
  inline void compact();
  inline uint64_t reader_available() const;
  inline uint64_t reader_io_position() const;
  inline uint64_t writer_available() const;
  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;
}

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

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 uint64_t  //
wuffs_base__io_buffer__writer_available(const wuffs_base__io_buffer* buf) {
  return buf ? buf->data.len - buf->meta.wi : 0;
}

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;
}

#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_available() const {
  return wuffs_base__io_buffer__reader_available(this);
}

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

inline uint64_t  //
wuffs_base__io_buffer::writer_available() const {
  return wuffs_base__io_buffer__writer_available(this);
}

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

#endif  // __cplusplus

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

// wuffs_base__token is an element of a byte stream's tokenization.
//
// See https://github.com/google/wuffs/blob/master/doc/note/tokens.md
typedef 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 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__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__VBD__FILLER__COMMENT_LINE 0x00001
#define WUFFS_BASE__TOKEN__VBD__FILLER__COMMENT_BLOCK 0x00002

  // --------

#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 is conservative: it is valid for all-ASCII strings to
// have neither DEFINITELY_UTF_8 or DEFINITELY_ASCII bits set.
#define WUFFS_BASE__TOKEN__VBD__STRING__DEFINITELY_UTF_8 0x00001
#define WUFFS_BASE__TOKEN__VBD__STRING__DEFINITELY_ASCII 0x00002

// "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 0x00010
#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_1_DST_1_SRC_COPY 0x00020
#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_1_DST_2_SRC_HEXADECIMAL 0x00040
#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_1_DST_4_SRC_BACKSLASH_X 0x00080
#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_3_DST_4_SRC_BASE_64_STD 0x00100
#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_3_DST_4_SRC_BASE_64_URL 0x00200
#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_4_DST_5_SRC_ASCII_85 0x00400

  // --------

#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 one 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 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

// --------

// 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 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 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;
}

// --------

// wuffs_base__token_buffer_meta is the metadata for a
// wuffs_base__token_buffer's data.
typedef 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__slice_token data;
  wuffs_base__token_buffer_meta meta;

#ifdef __cplusplus
  inline bool is_valid() const;
  inline void compact();
  inline uint64_t reader_available() const;
  inline uint64_t reader_token_position() const;
  inline uint64_t writer_available() const;
  inline uint64_t writer_token_position() 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_available(
    const wuffs_base__token_buffer* buf) {
  return buf ? buf->meta.wi - buf->meta.ri : 0;
}

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_available(
    const wuffs_base__token_buffer* buf) {
  return buf ? buf->data.len - buf->meta.wi : 0;
}

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_available() const {
  return wuffs_base__token_buffer__reader_available(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_available() const {
  return wuffs_base__token_buffer__writer_available(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)(num_u8 * sizeof(uint8_t));
    if (p) {
      return wuffs_base__make_slice_u8((uint8_t*)(p), 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)(num_u16 * sizeof(uint16_t));
    if (p) {
      return wuffs_base__make_slice_u16((uint16_t*)(p), 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)(num_u32 * sizeof(uint32_t));
    if (p) {
      return wuffs_base__make_slice_u32((uint32_t*)(p), 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)(num_u64 * sizeof(uint64_t));
    if (p) {
      return wuffs_base__make_slice_u64((uint64_t*)(p), 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);
}

// 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);
}

// --------

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__NON_PREMULTIPLIED_ALPHA 1
#define WUFFS_BASE__PIXEL_ALPHA_TRANSPARENCY__PREMULTIPLIED_ALPHA 2
#define WUFFS_BASE__PIXEL_ALPHA_TRANSPARENCY__BINARY_ALPHA 3

// --------

#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/master/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 {
  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__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_PREMUL 0x82008888
#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_PREMUL 0xA2008888
#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/master/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 {
  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 {
  // 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__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

// --------

// Deprecated: use wuffs_base__pixel_blend instead.
//
// wuffs_base__animation_blend encodes, for an animated image, how to blend the
// transparent pixels of this frame with the existing canvas. In Porter-Duff
// compositing operator terminology:
//  - 0 means the frame may be transparent, and should be blended "src over
//    dst", also known as just "over".
//  - 1 means the frame may be transparent, and should be blended "src".
//  - 2 means the frame is completely opaque, so that "src over dst" and "src"
//    are equivalent.
//
// These semantics are conservative. It is valid for a completely opaque frame
// to have a blend value other than 2.
typedef uint8_t wuffs_base__animation_blend;

#define WUFFS_BASE__ANIMATION_BLEND__SRC_OVER_DST \
  ((wuffs_base__animation_blend)0)
#define WUFFS_BASE__ANIMATION_BLEND__SRC ((wuffs_base__animation_blend)1)
#define WUFFS_BASE__ANIMATION_BLEND__OPAQUE ((wuffs_base__animation_blend)2)

// --------

// 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 {
  // 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 update(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__update(
    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::update(
    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__update(
      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_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__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 *= 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__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__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 {
  // 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 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;
    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

// 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 '-'.
WUFFS_BASE__MAYBE_STATIC wuffs_base__result_i64  //
wuffs_base__parse_number_i64(wuffs_base__slice_u8 s);

// 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 allow unnecessary leading zeroes ("0" is valid and its sole
//    zero is necessary). All of "00", "0644" and "007" are invalid.
//  - 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.
//  - It does allow arbitrary underscores, except inside the optional 2-byte
//    opening "0d" or "0X" that denotes base-10 or base-16. For example,
//    "__0D_1_002" would successfully parse as "one thousand and two".
WUFFS_BASE__MAYBE_STATIC wuffs_base__result_u64  //
wuffs_base__parse_number_u64(wuffs_base__slice_u8 s);

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

// 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 unnecessary leading zeroes ("0" is valid and its sole
//    zero is necessary). All of "00", "0644" and "00.7" are invalid.
//  - It is not affected by i18n / l10n settings such as environment variables.
//  - Conversely, it always accepts either ',' or '.' as a decimal separator.
//    In particular, "3,141,592" is always invalid but "3,141" is always valid
//    (and approximately π). The caller is responsible for e.g. previously
//    rejecting or filtering s if it contains a comma, if that is unacceptable
//    to the caller. For example, JSON numbers always use a dot '.' and never a
//    comma ',', regardless of the LOCALE environment variable.
//  - It does allow arbitrary underscores. For example, "_3.141_592" would
//    successfully parse, again approximately π.
//  - It does allow "inf", "+Infinity" and "-NAN", case insensitive, but it
//    does not permit "nan" to be followed by an integer mantissa.
//  - It does not allow hexadecimal floating point numbers.
//
// For modular builds that divide the base module into sub-modules, using this
// function requires the WUFFS_CONFIG__MODULE__BASE__F64CONV 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);

// wuffs_base__ieee_754_bit_representation__etc converts between a double
// precision numerical value and its IEEE 754 64-bit representation (1 sign
// bit, 11 exponent bits, 52 explicit significand bits).
//
// For example, it converts between:
//  - +1.0 and 0x3FF0_0000_0000_0000.
//  - +5.5 and 0x4016_0000_0000_0000.
//  - -inf and 0xFFF0_0000_0000_0000.
//
// See https://en.wikipedia.org/wiki/Double-precision_floating-point_format

static inline uint64_t  //
wuffs_base__ieee_754_bit_representation__from_f64(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__to_f64(uint64_t u) {
  double f = 0;
  if (sizeof(uint64_t) == sizeof(double)) {
    memcpy(&f, &u, sizeof(uint64_t));
  }
  return f;
}

// ---------------- Hexadecimal

// wuffs_base__hexadecimal__decode2 converts "6A6b" to "jk", where e.g. 'j' is
// U+006A. There are 2 source bytes for every destination byte.
//
// It returns the number of dst bytes written: the minimum of dst.len and
// (src.len / 2). Excess source bytes are ignored.
//
// 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.
WUFFS_BASE__MAYBE_STATIC size_t  //
wuffs_base__hexadecimal__decode2(wuffs_base__slice_u8 dst,
                                 wuffs_base__slice_u8 src);

// wuffs_base__hexadecimal__decode4 converts "\\x6A\\x6b" to "jk", where e.g.
// 'j' is U+006A. There are 4 source bytes for every destination byte.
//
// It returns the number of dst bytes written: the minimum of dst.len and
// (src.len / 4). Excess source bytes are ignored.
//
// 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.
WUFFS_BASE__MAYBE_STATIC size_t  //
wuffs_base__hexadecimal__decode4(wuffs_base__slice_u8 dst,
                                 wuffs_base__slice_u8 src);

// ---------------- 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 {
  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.
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 s.
//
// 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.
WUFFS_BASE__MAYBE_STATIC wuffs_base__utf_8__next__output  //
wuffs_base__utf_8__next(wuffs_base__slice_u8 s);

// wuffs_base__utf_8__longest_valid_prefix returns the largest n such that the
// sub-slice s[..n] is valid UTF-8.
//
// 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.
WUFFS_BASE__MAYBE_STATIC size_t  //
wuffs_base__utf_8__longest_valid_prefix(wuffs_base__slice_u8 s);

// wuffs_base__ascii__longest_valid_prefix returns the largest n such that the
// sub-slice s[..n] is valid ASCII.
//
// 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.
WUFFS_BASE__MAYBE_STATIC size_t  //
wuffs_base__ascii__longest_valid_prefix(wuffs_base__slice_u8 s);

// ---------------- 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__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__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__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__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 initialize_flags.

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 initialize_flags);

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;

  } 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 initialize_flags) {
    return wuffs_adler32__hasher__initialize(this, sizeof_star_self,
                                             wuffs_version, initialize_flags);
  }

  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__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 initialize_flags.

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 initialize_flags);

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;
    uint64_t f_bytes_per_row;
    wuffs_base__pixel_format f_pixfmt;
    uint32_t f_io_redirect_fourcc;
    uint64_t f_io_redirect_pos;
    uint64_t f_frame_config_io_position;
    uint32_t f_padding;
    uint32_t f_mask_r;
    uint32_t f_mask_g;
    uint32_t f_mask_b;
    uint32_t f_mask_a;
    uint32_t f_dst_x;
    uint32_t f_dst_y;
    uint32_t f_dst_y_end;
    uint32_t f_dst_y_inc;
    uint32_t f_pending_pad;
    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_skip_frame[1];
  } private_impl;

  struct {
    struct {
      uint32_t v_bitmap_info_len;
      uint32_t v_bits_per_pixel;
      uint32_t v_compression;
      uint64_t scratch;
    } s_decode_image_config[1];
    struct {
      uint64_t scratch;
    } s_decode_frame[1];
    struct {
      uint64_t scratch;
    } s_skip_frame[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 initialize_flags) {
    return wuffs_bmp__decoder__initialize(this, sizeof_star_self, wuffs_version,
                                          initialize_flags);
  }

  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

// ---------------- 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 initialize_flags.

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 initialize_flags);

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;

  } 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 initialize_flags) {
    return wuffs_crc32__ieee_hasher__initialize(
        this, sizeof_star_self, wuffs_version, initialize_flags);
  }

  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 initialize_flags.

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 initialize_flags);

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 initialize_flags) {
    return wuffs_deflate__decoder__initialize(this, sizeof_star_self,
                                              wuffs_version, initialize_flags);
  }

  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 initialize_flags.

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 initialize_flags);

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 initialize_flags) {
    return wuffs_lzw__decoder__initialize(this, sizeof_star_self, wuffs_version,
                                          initialize_flags);
  }

  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__config_decoder__struct wuffs_gif__config_decoder;

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 initialize_flags.

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
wuffs_gif__config_decoder__initialize(wuffs_gif__config_decoder* self,
                                      size_t sizeof_star_self,
                                      uint64_t wuffs_version,
                                      uint32_t initialize_flags);

size_t  //
sizeof__wuffs_gif__config_decoder();

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 initialize_flags);

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__config_decoder*  //
wuffs_gif__config_decoder__alloc();

static inline wuffs_base__image_decoder*  //
wuffs_gif__config_decoder__alloc_as__wuffs_base__image_decoder() {
  return (wuffs_base__image_decoder*)(wuffs_gif__config_decoder__alloc());
}

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__config_decoder__upcast_as__wuffs_base__image_decoder(
    wuffs_gif__config_decoder* p) {
  return (wuffs_base__image_decoder*)p;
}

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__config_decoder__set_quirk_enabled(wuffs_gif__config_decoder* self,
                                             uint32_t a_quirk,
                                             bool a_enabled);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gif__config_decoder__decode_image_config(wuffs_gif__config_decoder* self,
                                               wuffs_base__image_config* a_dst,
                                               wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
wuffs_gif__config_decoder__set_report_metadata(wuffs_gif__config_decoder* self,
                                               uint32_t a_fourcc,
                                               bool a_report);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gif__config_decoder__tell_me_more(wuffs_gif__config_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__config_decoder__num_animation_loops(
    const wuffs_gif__config_decoder* self);

WUFFS_BASE__MAYBE_STATIC uint64_t  //
wuffs_gif__config_decoder__num_decoded_frame_configs(
    const wuffs_gif__config_decoder* self);

WUFFS_BASE__MAYBE_STATIC uint64_t  //
wuffs_gif__config_decoder__num_decoded_frames(
    const wuffs_gif__config_decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32  //
wuffs_gif__config_decoder__frame_dirty_rect(
    const wuffs_gif__config_decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
wuffs_gif__config_decoder__workbuf_len(const wuffs_gif__config_decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gif__config_decoder__restart_frame(wuffs_gif__config_decoder* self,
                                         uint64_t a_index,
                                         uint64_t a_io_position);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gif__config_decoder__decode_frame_config(wuffs_gif__config_decoder* self,
                                               wuffs_base__frame_config* a_dst,
                                               wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gif__config_decoder__decode_frame(
    wuffs_gif__config_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__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__config_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 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_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];
  } private_impl;

  struct {
    uint8_t f_palettes[1][1024];

    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];
  } private_data;

#ifdef __cplusplus
#if __cplusplus >= 201103L
  using unique_ptr =
      std::unique_ptr<wuffs_gif__config_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__config_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__config_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__config_decoder__struct() = delete;
  wuffs_gif__config_decoder__struct(const wuffs_gif__config_decoder__struct&) =
      delete;
  wuffs_gif__config_decoder__struct& operator=(
      const wuffs_gif__config_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 initialize_flags) {
    return wuffs_gif__config_decoder__initialize(
        this, sizeof_star_self, wuffs_version, initialize_flags);
  }

  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__config_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__config_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__config_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__config_decoder__tell_me_more(this, a_dst, a_minfo, a_src);
  }

  inline uint32_t  //
  num_animation_loops() const {
    return wuffs_gif__config_decoder__num_animation_loops(this);
  }

  inline uint64_t  //
  num_decoded_frame_configs() const {
    return wuffs_gif__config_decoder__num_decoded_frame_configs(this);
  }

  inline uint64_t  //
  num_decoded_frames() const {
    return wuffs_gif__config_decoder__num_decoded_frames(this);
  }

  inline wuffs_base__rect_ie_u32  //
  frame_dirty_rect() const {
    return wuffs_gif__config_decoder__frame_dirty_rect(this);
  }

  inline wuffs_base__range_ii_u64  //
  workbuf_len() const {
    return wuffs_gif__config_decoder__workbuf_len(this);
  }

  inline wuffs_base__status  //
  restart_frame(uint64_t a_index, uint64_t a_io_position) {
    return wuffs_gif__config_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__config_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__config_decoder__decode_frame(this, a_dst, a_src, a_blend,
                                                   a_workbuf, a_opts);
  }

#endif  // __cplusplus

};  // struct wuffs_gif__config_decoder__struct

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 initialize_flags) {
    return wuffs_gif__decoder__initialize(this, sizeof_star_self, wuffs_version,
                                          initialize_flags);
  }

  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 initialize_flags.

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 initialize_flags);

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_ignore_checksum(wuffs_gzip__decoder* self, bool a_ic);

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 initialize_flags) {
    return wuffs_gzip__decoder__initialize(this, sizeof_star_self,
                                           wuffs_version, initialize_flags);
  }

  inline wuffs_base__io_transformer*  //
  upcast_as__wuffs_base__io_transformer() {
    return (wuffs_base__io_transformer*)this;
  }

  inline wuffs_base__empty_struct  //
  set_ignore_checksum(bool a_ic) {
    return wuffs_gzip__decoder__set_ignore_checksum(this, a_ic);
  }

  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__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 1225364488

#define WUFFS_JSON__QUIRK_ALLOW_BACKSLASH_ZERO 1225364489

#define WUFFS_JSON__QUIRK_ALLOW_COMMENT_BLOCK 1225364490

#define WUFFS_JSON__QUIRK_ALLOW_COMMENT_LINE 1225364491

#define WUFFS_JSON__QUIRK_ALLOW_EXTRA_COMMA 1225364492

#define WUFFS_JSON__QUIRK_ALLOW_INF_NAN_NUMBERS 1225364493

#define WUFFS_JSON__QUIRK_ALLOW_LEADING_ASCII_RECORD_SEPARATOR 1225364494

#define WUFFS_JSON__QUIRK_ALLOW_LEADING_UNICODE_BYTE_ORDER_MARK 1225364495

#define WUFFS_JSON__QUIRK_ALLOW_TRAILING_NEW_LINE 1225364496

#define WUFFS_JSON__QUIRK_REPLACE_INVALID_UNICODE 1225364497

// ---------------- 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 initialize_flags.

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 initialize_flags);

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[18];
    bool f_allow_leading_ars;
    bool f_allow_leading_ubom;
    bool f_end_of_data;

    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_trailing_new_line[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 initialize_flags) {
    return wuffs_json__decoder__initialize(this, sizeof_star_self,
                                           wuffs_version, initialize_flags);
  }

  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_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 initialize_flags.

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 initialize_flags);

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];
    uint32_t p_skip_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];
    struct {
      uint64_t scratch;
    } s_skip_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 initialize_flags) {
    return wuffs_wbmp__decoder__initialize(this, sizeof_star_self,
                                           wuffs_version, initialize_flags);
  }

  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

#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 initialize_flags.

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 initialize_flags);

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_ignore_checksum(wuffs_zlib__decoder* self, bool a_ic);

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 initialize_flags) {
    return wuffs_zlib__decoder__initialize(this, sizeof_star_self,
                                           wuffs_version, initialize_flags);
  }

  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_ignore_checksum(bool a_ic) {
    return wuffs_zlib__decoder__set_ignore_checksum(this, a_ic);
  }

  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

// WUFFS C HEADER ENDS HERE.
#ifdef WUFFS_IMPLEMENTATION

#ifdef __cplusplus
extern "C" {
#endif

static inline wuffs_base__empty_struct  //
wuffs_base__ignore_status(wuffs_base__status z) {
  return wuffs_base__make_empty_struct();
}

// 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

// ---------------- 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 = 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 = 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;
}

static inline wuffs_base__slice_u8  //
wuffs_base__io__since(uint64_t mark, uint64_t index, uint8_t* ptr) {
  if (index >= mark) {
    return wuffs_base__make_slice_u8(ptr + mark, index - mark);
  }
  return wuffs_base__make_slice_u8(NULL, 0);
}

// --------

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__load_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 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;
}

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__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);

// ---------------- 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_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";

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

// 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
};

// --------

WUFFS_BASE__MAYBE_STATIC wuffs_base__result_i64  //
wuffs_base__parse_number_i64(wuffs_base__slice_u8 s) {
  uint8_t* p = s.ptr;
  uint8_t* q = s.ptr + s.len;

  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)));
    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) {
  uint8_t* p = s.ptr;
  uint8_t* q = s.ptr + s.len;

  for (; (p < q) && (*p == '_'); p++) {
  }

  if (p >= q) {
    goto fail_bad_argument;

  } else if (*p == '0') {
    p++;
    if (p >= q) {
      goto ok_zero;
    }
    if (*p == '_') {
      p++;
      for (; p < q; p++) {
        if (*p != '_') {
          goto fail_bad_argument;
        }
      }
      goto ok_zero;
    }

    if ((*p == 'x') || (*p == 'X')) {
      p++;
      for (; (p < q) && (*p == '_'); p++) {
      }
      if (p < q) {
        goto hexadecimal;
      }

    } else if ((*p == 'd') || (*p == 'D')) {
      p++;
      for (; (p < q) && (*p == '_'); p++) {
      }
      if (p < q) {
        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 == '_') {
        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 == '_') {
        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);
}

// ---------------- Hexadecimal

WUFFS_BASE__MAYBE_STATIC size_t  //
wuffs_base__hexadecimal__decode2(wuffs_base__slice_u8 dst,
                                 wuffs_base__slice_u8 src) {
  size_t src_len2 = src.len / 2;
  size_t len = dst.len < src_len2 ? dst.len : src_len2;
  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;
  }

  return len;
}

WUFFS_BASE__MAYBE_STATIC size_t  //
wuffs_base__hexadecimal__decode4(wuffs_base__slice_u8 dst,
                                 wuffs_base__slice_u8 src) {
  size_t src_len4 = src.len / 4;
  size_t len = dst.len < src_len4 ? dst.len : src_len4;
  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;
  }

  return len;
}

// ---------------- 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(wuffs_base__slice_u8 s) {
  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__load_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__load_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__load_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 size_t  //
wuffs_base__utf_8__longest_valid_prefix(wuffs_base__slice_u8 s) {
  // 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);
    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(wuffs_base__slice_u8 s) {
  // TODO: possibly optimize this by checking 4 or 8 bytes at a time.
  uint8_t* original_ptr = s.ptr;
  uint8_t* p = s.ptr;
  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__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__F64CONV)

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

#define WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE 1023
#define WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION 500

// 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 500 decimal digits. 500 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 +1023 mean infinity, below -1023 mean zero. The ±1023
// bounds are further away from zero than ±(324 + 500), where 500 and 1023 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 +1023 means that the overall value is
// infinity, lower than -1023 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 {
  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--;
  }
}

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) {
  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;

  for (; (p < q) && (*p == '_'); p++) {
  }
  if (p >= q) {
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }

  // Parse sign.
  do {
    if (*p == '+') {
      p++;
    } else if (*p == '-') {
      h->negative = true;
      p++;
    } else {
      break;
    }
    for (; (p < q) && (*p == '_'); p++) {
    }
  } while (0);

  // Parse digits.
  uint32_t nd = 0;
  int32_t dp = 0;
  bool saw_digits = false;
  bool saw_non_zero_digits = false;
  bool saw_dot = false;
  for (; p < q; p++) {
    if (*p == '_') {
      // No-op.

    } else if ((*p == '.') || (*p == ',')) {
      // As per https://en.wikipedia.org/wiki/Decimal_separator, both '.' or
      // ',' are commonly used. We just parse either, regardless of LOCALE.
      if (saw_dot) {
        return wuffs_base__make_status(wuffs_base__error__bad_argument);
      }
      saw_dot = true;
      dp = (int32_t)nd;

    } else if ('0' == *p) {
      if (!saw_dot && !saw_non_zero_digits && saw_digits) {
        // We don't allow unnecessary leading zeroes: "000123" or "0644".
        return wuffs_base__make_status(wuffs_base__error__bad_argument);
      }
      saw_digits = true;
      if (nd == 0) {
        // Track leading zeroes implicitly.
        dp--;
      } else if (nd <
                 WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION) {
        h->digits[nd++] = 0;
      } else {
        // Long-tail zeroes are ignored.
      }

    } else if (('0' < *p) && (*p <= '9')) {
      if (!saw_dot && !saw_non_zero_digits && saw_digits) {
        // We don't allow unnecessary leading zeroes: "000123" or "0644".
        return wuffs_base__make_status(wuffs_base__error__bad_argument);
      }
      saw_digits = true;
      saw_non_zero_digits = true;
      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 {
      break;
    }
  }

  if (!saw_digits) {
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  if (!saw_dot) {
    dp = (int32_t)nd;
  }

  // Parse exponent.
  if ((p < q) && ((*p == 'E') || (*p == 'e'))) {
    p++;
    for (; (p < q) && (*p == '_'); p++) {
    }
    if (p >= q) {
      return wuffs_base__make_status(wuffs_base__error__bad_argument);
    }

    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 == '_') {
        // 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;
  }

  // Finish.
  if (p != q) {
    return wuffs_base__make_status(wuffs_base__error__bad_argument);
  }
  h->num_digits = nd;
  if (nd == 0) {
    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);
}

// --------

// 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__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.

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->negative = false;
    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);
}

// --------

// The wuffs_base__private_implementation__etc_powers_of_10 tables were printed
// by script/print-mpb-powers-of-10.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__medium_prec_bin__assign_from_hpd.

// wuffs_base__private_implementation__big_powers_of_10 contains approximations
// to the powers of 10, ranging from 1e-348 to 1e+340, with the exponent
// stepping by 8: -348, -340, -332, ..., -12, -4, +4, +12, ..., +340. Each step
// consists of three uint32_t elements. There are 87 triples, 87 * 3 = 261.
//
// For example, the third approximation, for 1e-332, consists of the uint32_t
// triple (0x3055AC76, 0x8B16FB20, 0xFFFFFB72). The first two of that triple
// are a little-endian uint64_t value: 0x8B16FB203055AC76. The last one is an
// int32_t value: -1166. Together, they represent the approximation:
//   1e-332 ≈ 0x8B16FB203055AC76 * (2 ** -1166)
// Similarly, the (0x00000000, 0x9C400000, 0xFFFFFFCE) uint32_t triple means:
//   1e+4   ≈ 0x9C40000000000000 * (2 **   -50)  // This approx'n is exact.
// Similarly, the (0xD4C4FB27, 0xED63A231, 0x000000A2) uint32_t triple means:
//   1e+68  ≈ 0xED63A231D4C4FB27 * (2 **   162)
static const uint32_t
    wuffs_base__private_implementation__big_powers_of_10[261] = {
        0x081C0288, 0xFA8FD5A0, 0xFFFFFB3C, 0xA23EBF76, 0xBAAEE17F, 0xFFFFFB57,
        0x3055AC76, 0x8B16FB20, 0xFFFFFB72, 0x5DCE35EA, 0xCF42894A, 0xFFFFFB8C,
        0x55653B2D, 0x9A6BB0AA, 0xFFFFFBA7, 0x3D1A45DF, 0xE61ACF03, 0xFFFFFBC1,
        0xC79AC6CA, 0xAB70FE17, 0xFFFFFBDC, 0xBEBCDC4F, 0xFF77B1FC, 0xFFFFFBF6,
        0x416BD60C, 0xBE5691EF, 0xFFFFFC11, 0x907FFC3C, 0x8DD01FAD, 0xFFFFFC2C,
        0x31559A83, 0xD3515C28, 0xFFFFFC46, 0xADA6C9B5, 0x9D71AC8F, 0xFFFFFC61,
        0x23EE8BCB, 0xEA9C2277, 0xFFFFFC7B, 0x4078536D, 0xAECC4991, 0xFFFFFC96,
        0x5DB6CE57, 0x823C1279, 0xFFFFFCB1, 0x4DFB5637, 0xC2109436, 0xFFFFFCCB,
        0x3848984F, 0x9096EA6F, 0xFFFFFCE6, 0x25823AC7, 0xD77485CB, 0xFFFFFD00,
        0x97BF97F4, 0xA086CFCD, 0xFFFFFD1B, 0x172AACE5, 0xEF340A98, 0xFFFFFD35,
        0x2A35B28E, 0xB23867FB, 0xFFFFFD50, 0xD2C63F3B, 0x84C8D4DF, 0xFFFFFD6B,
        0x1AD3CDBA, 0xC5DD4427, 0xFFFFFD85, 0xBB25C996, 0x936B9FCE, 0xFFFFFDA0,
        0x7D62A584, 0xDBAC6C24, 0xFFFFFDBA, 0x0D5FDAF6, 0xA3AB6658, 0xFFFFFDD5,
        0xDEC3F126, 0xF3E2F893, 0xFFFFFDEF, 0xAAFF80B8, 0xB5B5ADA8, 0xFFFFFE0A,
        0x6C7C4A8B, 0x87625F05, 0xFFFFFE25, 0x34C13053, 0xC9BCFF60, 0xFFFFFE3F,
        0x91BA2655, 0x964E858C, 0xFFFFFE5A, 0x70297EBD, 0xDFF97724, 0xFFFFFE74,
        0xB8E5B88F, 0xA6DFBD9F, 0xFFFFFE8F, 0x88747D94, 0xF8A95FCF, 0xFFFFFEA9,
        0x8FA89BCF, 0xB9447093, 0xFFFFFEC4, 0xBF0F156B, 0x8A08F0F8, 0xFFFFFEDF,
        0x653131B6, 0xCDB02555, 0xFFFFFEF9, 0xD07B7FAC, 0x993FE2C6, 0xFFFFFF14,
        0x2A2B3B06, 0xE45C10C4, 0xFFFFFF2E, 0x697392D3, 0xAA242499, 0xFFFFFF49,
        0x8300CA0E, 0xFD87B5F2, 0xFFFFFF63, 0x92111AEB, 0xBCE50864, 0xFFFFFF7E,
        0x6F5088CC, 0x8CBCCC09, 0xFFFFFF99, 0xE219652C, 0xD1B71758, 0xFFFFFFB3,
        0x00000000, 0x9C400000, 0xFFFFFFCE, 0x00000000, 0xE8D4A510, 0xFFFFFFE8,
        0xAC620000, 0xAD78EBC5, 0x00000003, 0xF8940984, 0x813F3978, 0x0000001E,
        0xC90715B3, 0xC097CE7B, 0x00000038, 0x7BEA5C70, 0x8F7E32CE, 0x00000053,
        0xABE98068, 0xD5D238A4, 0x0000006D, 0x179A2245, 0x9F4F2726, 0x00000088,
        0xD4C4FB27, 0xED63A231, 0x000000A2, 0x8CC8ADA8, 0xB0DE6538, 0x000000BD,
        0x1AAB65DB, 0x83C7088E, 0x000000D8, 0x42711D9A, 0xC45D1DF9, 0x000000F2,
        0xA61BE758, 0x924D692C, 0x0000010D, 0x1A708DEA, 0xDA01EE64, 0x00000127,
        0x9AEF774A, 0xA26DA399, 0x00000142, 0xB47D6B85, 0xF209787B, 0x0000015C,
        0x79DD1877, 0xB454E4A1, 0x00000177, 0x5B9BC5C2, 0x865B8692, 0x00000192,
        0xC8965D3D, 0xC83553C5, 0x000001AC, 0xFA97A0B3, 0x952AB45C, 0x000001C7,
        0x99A05FE3, 0xDE469FBD, 0x000001E1, 0xDB398C25, 0xA59BC234, 0x000001FC,
        0xA3989F5C, 0xF6C69A72, 0x00000216, 0x54E9BECE, 0xB7DCBF53, 0x00000231,
        0xF22241E2, 0x88FCF317, 0x0000024C, 0xD35C78A5, 0xCC20CE9B, 0x00000266,
        0x7B2153DF, 0x98165AF3, 0x00000281, 0x971F303A, 0xE2A0B5DC, 0x0000029B,
        0x5CE3B396, 0xA8D9D153, 0x000002B6, 0xA4A7443C, 0xFB9B7CD9, 0x000002D0,
        0xA7A44410, 0xBB764C4C, 0x000002EB, 0xB6409C1A, 0x8BAB8EEF, 0x00000306,
        0xA657842C, 0xD01FEF10, 0x00000320, 0xE9913129, 0x9B10A4E5, 0x0000033B,
        0xA19C0C9D, 0xE7109BFB, 0x00000355, 0x623BF429, 0xAC2820D9, 0x00000370,
        0x7AA7CF85, 0x80444B5E, 0x0000038B, 0x03ACDD2D, 0xBF21E440, 0x000003A5,
        0x5E44FF8F, 0x8E679C2F, 0x000003C0, 0x9C8CB841, 0xD433179D, 0x000003DA,
        0xB4E31BA9, 0x9E19DB92, 0x000003F5, 0xBADF77D9, 0xEB96BF6E, 0x0000040F,
        0x9BF0EE6B, 0xAF87023B, 0x0000042A,
};

// wuffs_base__private_implementation__small_powers_of_10 contains
// approximations to the powers of 10, ranging from 1e+0 to 1e+7, with the
// exponent stepping by 1. Each step consists of three uint32_t elements.
//
// For example, the third approximation, for 1e+2, consists of the uint32_t
// triple (0x00000000, 0xC8000000, 0xFFFFFFC7). The first two of that triple
// are a little-endian uint64_t value: 0xC800000000000000. The last one is an
// int32_t value: -57. Together, they represent the approximation:
//   1e+2   ≈ 0xC800000000000000 * (2 **   -57)  // This approx'n is exact.
// Similarly, the (0x00000000, 0x9C400000, 0xFFFFFFCE) uint32_t triple means:
//   1e+4   ≈ 0x9C40000000000000 * (2 **   -50)  // This approx'n is exact.
static const uint32_t
    wuffs_base__private_implementation__small_powers_of_10[24] = {
        0x00000000, 0x80000000, 0xFFFFFFC1, 0x00000000, 0xA0000000, 0xFFFFFFC4,
        0x00000000, 0xC8000000, 0xFFFFFFC7, 0x00000000, 0xFA000000, 0xFFFFFFCA,
        0x00000000, 0x9C400000, 0xFFFFFFCE, 0x00000000, 0xC3500000, 0xFFFFFFD1,
        0x00000000, 0xF4240000, 0xFFFFFFD4, 0x00000000, 0x98968000, 0xFFFFFFD8,
};

// 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,
};

// --------

// wuffs_base__private_implementation__medium_prec_bin (abbreviated as MPB) is
// a fixed precision floating point binary number. Unlike IEEE 754 Floating
// Point, it cannot represent infinity or NaN (Not a Number).
//
// "Medium precision" means that the mantissa holds 64 binary digits, a little
// more than "double precision", and sizeof(MPB) > sizeof(double). 64 is
// obviously the number of bits in a uint64_t.
//
// An MPB isn't for general purpose arithmetic, only for conversions to and
// from IEEE 754 double-precision floating point.
//
// There is no implicit mantissa bit. The mantissa field is zero if and only if
// the overall floating point value is ±0. An MPB is normalized if the mantissa
// is zero or its high bit (the 1<<63 bit) is set.
//
// There is no negative bit. An MPB can only represent non-negative numbers.
//
// The "all fields are zero" value is valid, and represents the number +0.
//
// This is the "Do It Yourself Floating Point" data structure from Loitsch,
// "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
typedef struct {
  uint64_t mantissa;
  int32_t exp2;
} wuffs_base__private_implementation__medium_prec_bin;

static uint32_t  //
wuffs_base__private_implementation__medium_prec_bin__normalize(
    wuffs_base__private_implementation__medium_prec_bin* m) {
  if (m->mantissa == 0) {
    return 0;
  }
  uint32_t shift = wuffs_base__count_leading_zeroes_u64(m->mantissa);
  m->mantissa <<= shift;
  m->exp2 -= (int32_t)shift;
  return shift;
}

// wuffs_base__private_implementation__medium_prec_bin__mul_pow_10 sets m to be
// (m * pow), where pow comes from an etc_powers_of_10 triple starting at p.
//
// The result is rounded, but not necessarily normalized.
//
// Preconditions:
//  - m is non-NULL.
//  - m->mantissa is non-zero.
//  - m->mantissa's high bit is set (i.e. m is normalized).
//
// The etc_powers_of_10 triple is already normalized.
static void  //
wuffs_base__private_implementation__medium_prec_bin__mul_pow_10(
    wuffs_base__private_implementation__medium_prec_bin* m,
    const uint32_t* p) {
  uint64_t p_mantissa = ((uint64_t)p[0]) | (((uint64_t)p[1]) << 32);
  int32_t p_exp2 = (int32_t)p[2];

  wuffs_base__multiply_u64__output o =
      wuffs_base__multiply_u64(m->mantissa, p_mantissa);
  // Round the mantissa up. It cannot overflow because the maximum possible
  // value of o.hi is 0xFFFFFFFFFFFFFFFE.
  m->mantissa = o.hi + (o.lo >> 63);
  m->exp2 = m->exp2 + p_exp2 + 64;
}

// wuffs_base__private_implementation__medium_prec_bin__as_f64 converts m to a
// double (what C calls a double-precision float64).
//
// Preconditions:
//  - m is non-NULL.
//  - m->mantissa is non-zero.
//  - m->mantissa's high bit is set (i.e. m is normalized).
static double  //
wuffs_base__private_implementation__medium_prec_bin__as_f64(
    const wuffs_base__private_implementation__medium_prec_bin* m,
    bool negative) {
  uint64_t mantissa64 = m->mantissa;
  // An mpb's mantissa has the implicit (binary) decimal point at the right
  // hand end of the mantissa's explicit digits. A double-precision's mantissa
  // has that decimal point near the left hand end. There's also an explicit
  // versus implicit leading 1 bit (binary digit). Together, the difference in
  // semantics corresponds to adding 63.
  int32_t exp2 = m->exp2 + 63;

  // Ensure that exp2 is at least -1022, the minimum double-precision exponent
  // for normal (as opposed to subnormal) numbers.
  if (-1022 > exp2) {
    uint32_t n = (uint32_t)(-1022 - exp2);
    mantissa64 >>= n;
    exp2 += (int32_t)n;
  }

  // Extract the (1 + 52) bits from the 64-bit mantissa64. 52 is the number of
  // explicit mantissa bits in a double-precision f64.
  //
  // Before, we have 64 bits and due to normalization, the high bit 'H' is 1.
  // 63        55        47       etc     15        7
  // H210_9876_5432_1098_7654_etc_etc_etc_5432_1098_7654_3210
  // ++++_++++_++++_++++_++++_etc_etc_etc_++++_+..._...._....  Kept bits.
  // ...._...._...H_2109_8765_etc_etc_etc_6543_2109_8765_4321  After shifting.
  // After, we have 53 bits (and bit #52 is this 'H' bit).
  uint64_t mantissa53 = mantissa64 >> 11;

  // Round up if the old bit #10 (the highest bit dropped by shifting) was set.
  // We also fix any overflow from rounding up.
  if (mantissa64 & 1024) {
    mantissa53++;
    if ((mantissa53 >> 53) != 0) {
      mantissa53 >>= 1;
      exp2++;
    }
  }

  // Handle double-precision infinity (a nominal exponent of 1024) and
  // subnormals (an exponent of -1023 and no implicit mantissa bit, bit #52).
  if (exp2 >= 1024) {
    mantissa53 = 0;
    exp2 = 1024;
  } else if ((mantissa53 >> 52) == 0) {
    exp2 = -1023;
  }

  // Pack the bits and return.
  const int32_t f64_bias = -1023;
  uint64_t exp2_bits =
      (uint64_t)((exp2 - f64_bias) & 0x07FF);           // (1 << 11) - 1.
  uint64_t bits = (mantissa53 & 0x000FFFFFFFFFFFFF) |   // (1 << 52) - 1.
                  (exp2_bits << 52) |                   //
                  (negative ? 0x8000000000000000 : 0);  // (1 << 63).
  return wuffs_base__ieee_754_bit_representation__to_f64(bits);
}

// wuffs_base__private_implementation__medium_prec_bin__parse_number_f64
// converts from an HPD to a double, using an MPB as scratch space. It returns
// a NULL status.repr if there is no ambiguity in the truncation or rounding to
// a float64 (an IEEE 754 double-precision floating point value).
//
// It may modify m even if it returns a non-NULL status.repr.
static wuffs_base__result_f64  //
wuffs_base__private_implementation__medium_prec_bin__parse_number_f64(
    wuffs_base__private_implementation__medium_prec_bin* m,
    const wuffs_base__private_implementation__high_prec_dec* h,
    bool skip_fast_path_for_tests) {
  do {
    // m->mantissa is a uint64_t, which is an integer approximation to a
    // rational value - h's underlying digits after m's normalization. This
    // error is an upper bound on the difference between the approximate and
    // actual value.
    //
    // The DiyFpStrtod function in https://github.com/google/double-conversion
    // uses a finer grain (1/8th of the ULP, Unit in the Last Place) when
    // tracking error. This implementation is coarser (1 ULP) but simpler.
    //
    // It is an error in the "numerical approximation" sense, not in the
    // typical programming sense (as in "bad input" or "a result type").
    uint64_t error = 0;

    // Convert up to 19 decimal digits (in h->digits) to 64 binary digits (in
    // m->mantissa): (1e19 < (1<<64)) and ((1<<64) < 1e20). If we have more
    // than 19 digits, we're truncating (with error).
    uint32_t i;
    uint32_t i_end = h->num_digits;
    if (i_end > 19) {
      i_end = 19;
      error = 1;
    }
    uint64_t mantissa = 0;
    for (i = 0; i < i_end; i++) {
      mantissa = (10 * mantissa) + h->digits[i];
    }
    m->mantissa = mantissa;
    m->exp2 = 0;

    // Check that exp10 lies in the (big_powers_of_10 + small_powers_of_10)
    // range, -348 ..= +347, stepping big_powers_of_10 by 8 (which is 87
    // triples) and small_powers_of_10 by 1 (which is 8 triples).
    int32_t exp10 = h->decimal_point - ((int32_t)(i_end));
    if (exp10 < -348) {
      goto fail;
    }
    uint32_t bpo10 = ((uint32_t)(exp10 + 348)) / 8;
    uint32_t spo10 = ((uint32_t)(exp10 + 348)) % 8;
    if (bpo10 >= 87) {
      goto fail;
    }

    // Try a fast path, if float64 math would be exact.
    //
    // 15 is such that 1e15 can be losslessly represented in a float64
    // mantissa: (1e15 < (1<<53)) and ((1<<53) < 1e16).
    //
    // 22 is the maximum valid index for the
    // wuffs_base__private_implementation__f64_powers_of_10 array.
    do {
      if (skip_fast_path_for_tests || ((mantissa >> 52) != 0)) {
        break;
      }
      double d = (double)mantissa;

      if (exp10 == 0) {
        wuffs_base__result_f64 ret;
        ret.status.repr = NULL;
        ret.value = h->negative ? -d : +d;
        return ret;

      } else if (exp10 > 0) {
        if (exp10 > 22) {
          if (exp10 > (15 + 22)) {
            break;
          }
          // If exp10 is in the range 23 ..= 37, try moving a few of the zeroes
          // from the exponent to the mantissa. If we're still under 1e15, we
          // haven't truncated any mantissa bits.
          if (exp10 > 22) {
            d *= wuffs_base__private_implementation__f64_powers_of_10[exp10 -
                                                                      22];
            exp10 = 22;
            if (d >= 1e15) {
              break;
            }
          }
        }
        d *= wuffs_base__private_implementation__f64_powers_of_10[exp10];
        wuffs_base__result_f64 ret;
        ret.status.repr = NULL;
        ret.value = h->negative ? -d : +d;
        return ret;

      } else {  // "if (exp10 < 0)" is effectively "if (true)" here.
        if (exp10 < -22) {
          break;
        }
        d /= wuffs_base__private_implementation__f64_powers_of_10[-exp10];
        wuffs_base__result_f64 ret;
        ret.status.repr = NULL;
        ret.value = h->negative ? -d : +d;
        return ret;
      }
    } while (0);

    // Normalize (and scale the error).
    error <<= wuffs_base__private_implementation__medium_prec_bin__normalize(m);

    // Multiplying two MPB values nominally multiplies two mantissas, call them
    // A and B, which are integer approximations to the precise values (A+a)
    // and (B+b) for some error terms a and b.
    //
    // MPB multiplication calculates (((A+a) * (B+b)) >> 64) to be ((A*B) >>
    // 64). Shifting (truncating) and rounding introduces further error. The
    // difference between the calculated result:
    //  ((A*B                  ) >> 64)
    // and the true result:
    //  ((A*B + A*b + a*B + a*b) >> 64)   + rounding_error
    // is:
    //  ((      A*b + a*B + a*b) >> 64)   + rounding_error
    // which can be re-grouped as:
    //  ((A*b) >> 64) + ((a*(B+b)) >> 64) + rounding_error
    //
    // Now, let A and a be "m->mantissa" and "error", and B and b be the
    // pre-calculated power of 10. A and B are both less than (1 << 64), a is
    // the "error" local variable and b is less than 1.
    //
    // An upper bound (in absolute value) on ((A*b) >> 64) is therefore 1.
    //
    // An upper bound on ((a*(B+b)) >> 64) is a, also known as error.
    //
    // Finally, the rounding_error is at most 1.
    //
    // In total, calling mpb__mul_pow_10 will raise the worst-case error by 2.
    // The subsequent re-normalization can multiply that by a further factor.

    // Multiply by small_powers_of_10[etc].
    wuffs_base__private_implementation__medium_prec_bin__mul_pow_10(
        m, &wuffs_base__private_implementation__small_powers_of_10[3 * spo10]);
    error += 2;
    error <<= wuffs_base__private_implementation__medium_prec_bin__normalize(m);

    // Multiply by big_powers_of_10[etc].
    wuffs_base__private_implementation__medium_prec_bin__mul_pow_10(
        m, &wuffs_base__private_implementation__big_powers_of_10[3 * bpo10]);
    error += 2;
    error <<= wuffs_base__private_implementation__medium_prec_bin__normalize(m);

    // We have a good approximation of h, but we still have to check whether
    // the error is small enough. Equivalently, whether the number of surplus
    // mantissa bits (the bits dropped when going from m's 64 mantissa bits to
    // the smaller number of double-precision mantissa bits) would always round
    // up or down, even when perturbed by ±error. We start at 11 surplus bits
    // (m has 64, double-precision has 1+52), but it can be higher for
    // subnormals.
    //
    // In many cases, the error is small enough and we return true.
    const int32_t f64_bias = -1023;
    int32_t subnormal_exp2 = f64_bias - 63;
    uint32_t surplus_bits = 11;
    if (subnormal_exp2 >= m->exp2) {
      surplus_bits += 1 + ((uint32_t)(subnormal_exp2 - m->exp2));
    }

    uint64_t surplus_mask =
        (((uint64_t)1) << surplus_bits) - 1;  // e.g. 0x07FF.
    uint64_t surplus = m->mantissa & surplus_mask;
    uint64_t halfway = ((uint64_t)1) << (surplus_bits - 1);  // e.g. 0x0400.

    // Do the final calculation in *signed* arithmetic.
    int64_t i_surplus = (int64_t)surplus;
    int64_t i_halfway = (int64_t)halfway;
    int64_t i_error = (int64_t)error;

    if ((i_surplus > (i_halfway - i_error)) &&
        (i_surplus < (i_halfway + i_error))) {
      goto fail;
    }

    wuffs_base__result_f64 ret;
    ret.status.repr = NULL;
    ret.value = wuffs_base__private_implementation__medium_prec_bin__as_f64(
        m, h->negative);
    return ret;
  } while (0);

fail:
  do {
    wuffs_base__result_f64 ret;
    ret.status.repr = "#base: mpb__parse_number_f64 failed";
    ret.value = 0;
    return ret;
  } while (0);
}

// --------

static wuffs_base__result_f64  //
wuffs_base__parse_number_f64_special(wuffs_base__slice_u8 s,
                                     const char* fallback_status_repr) {
  do {
    uint8_t* p = s.ptr;
    uint8_t* q = s.ptr + s.len;

    for (; (p < q) && (*p == '_'); p++) {
    }
    if (p >= q) {
      goto fallback;
    }

    // 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 fallback;
    }

    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 fallback;
        }
        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 fallback;
        }
        p += 5;

        if ((p >= q) || (*p == '_')) {
          break;
        }
        goto fallback;

      case 'N':
      case 'n':
        if (((q - p) < 3) ||                     //
            ((p[1] != 'A') && (p[1] != 'a')) ||  //
            ((p[2] != 'N') && (p[2] != 'n'))) {
          goto fallback;
        }
        p += 3;

        if ((p >= q) || (*p == '_')) {
          nan = true;
          break;
        }
        goto fallback;

      default:
        goto fallback;
    }

    // Finish.
    for (; (p < q) && (*p == '_'); p++) {
    }
    if (p != q) {
      goto fallback;
    }
    wuffs_base__result_f64 ret;
    ret.status.repr = NULL;
    ret.value = wuffs_base__ieee_754_bit_representation__to_f64(
        (nan ? 0x7FFFFFFFFFFFFFFF : 0x7FF0000000000000) |
        (negative ? 0x8000000000000000 : 0));
    return ret;
  } while (0);

fallback:
  do {
    wuffs_base__result_f64 ret;
    ret.status.repr = fallback_status_repr;
    ret.value = 0;
    return ret;
  } while (0);
}

WUFFS_BASE__MAYBE_STATIC wuffs_base__result_f64  //
wuffs_base__parse_number_f64(wuffs_base__slice_u8 s) {
  wuffs_base__private_implementation__medium_prec_bin m;
  wuffs_base__private_implementation__high_prec_dec h;

  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,      //
    };

    wuffs_base__status status =
        wuffs_base__private_implementation__high_prec_dec__parse(&h, s);
    if (status.repr) {
      return wuffs_base__parse_number_f64_special(s, status.repr);
    }

    // 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;
    }

    wuffs_base__result_f64 mpb_result =
        wuffs_base__private_implementation__medium_prec_bin__parse_number_f64(
            &m, &h, false);
    if (mpb_result.status.repr == NULL) {
      return mpb_result;
    }

    // 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__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__to_f64(bits);
    return ret;
  } while (0);

infinity:
  do {
    uint64_t bits = h.negative ? 0xFFF0000000000000 : 0x7FF0000000000000;

    wuffs_base__result_f64 ret;
    ret.status.repr = NULL;
    ret.value = wuffs_base__ieee_754_bit_representation__to_f64(bits);
    return ret;
  } while (0);
}

#endif  // !defined(WUFFS_CONFIG__MODULES) ||
        // defined(WUFFS_CONFIG__MODULE__BASE) ||
        // defined(WUFFS_CONFIG__MODULE__BASE__F64CONV)

#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__load_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__load_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__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__load_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__load_u16le__no_bounds_check(row + (2 * ((size_t)x))));
    case WUFFS_BASE__PIXEL_FORMAT__BGR:
      return 0xFF000000 |
             wuffs_base__load_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__load_u32le__no_bounds_check(row + (4 * ((size_t)x))));
    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
      return 0xFF000000 |
             wuffs_base__load_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__load_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__load_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__load_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__load_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__store_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__store_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__INDEXED__BGRA_BINARY:
      wuffs_base__store_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__store_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__store_u24le__no_bounds_check(row + (3 * ((size_t)x)), color);
      break;
    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
      wuffs_base__store_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__RGB:
      wuffs_base__store_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__store_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__store_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) {
  // Convert from 8-bit color to 16-bit color.
  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 and combine the components.
  da >>= 8;
  dr >>= 8;
  dg >>= 8;
  db >>= 8;
  return (db << 0) | (dg << 8) | (dr << 16) | (da << 24);
}

static inline uint32_t  //
wuffs_base__composite_nonpremul_premul_u32_axxx(uint32_t dst_nonpremul,
                                                uint32_t src_premul) {
  // Convert from 8-bit color to 16-bit color.
  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 and combine the components.
  da >>= 8;
  dr >>= 8;
  dg >>= 8;
  db >>= 8;
  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) {
  // Convert from 8-bit color to 16-bit color.
  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 and combine the components.
  da >>= 8;
  dr >>= 8;
  dg >>= 8;
  db >>= 8;
  return (db << 0) | (dg << 8) | (dr << 16) | (da << 24);
}

static inline uint32_t  //
wuffs_base__composite_premul_premul_u32_axxx(uint32_t dst_premul,
                                             uint32_t src_premul) {
  // Convert from 8-bit color to 16-bit color.
  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 and combine the components.
  da >>= 8;
  dr >>= 8;
  dg >>= 8;
  db >>= 8;
  return (db << 0) | (dg << 8) | (dr << 16) | (da << 24);
}

// --------

static uint64_t  //
wuffs_base__pixel_swizzler__squash_bgr_565_888(wuffs_base__slice_u8 dst,
                                               wuffs_base__slice_u8 src) {
  size_t len4 = (dst.len < src.len ? dst.len : src.len) / 4;
  uint8_t* d = dst.ptr;
  const uint8_t* s = src.ptr;

  size_t n = len4;
  while (n--) {
    uint32_t argb = wuffs_base__load_u32le__no_bounds_check(s);
    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__store_u32le__no_bounds_check(
        d, alpha | (r5 << 11) | (g6 << 5) | (b5 << 0));
    s += 4;
    d += 4;
  }
  return len4 * 4;
}

static uint64_t  //
wuffs_base__pixel_swizzler__swap_rgbx_bgrx(wuffs_base__slice_u8 dst,
                                           wuffs_base__slice_u8 src) {
  size_t len4 = (dst.len < src.len ? dst.len : src.len) / 4;
  uint8_t* d = dst.ptr;
  const uint8_t* s = src.ptr;

  size_t n = len4;
  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 len4 * 4;
}

// --------

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__store_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__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__store_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__load_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__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) {
    // Convert from 8-bit color to 16-bit color.
    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__load_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__store_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__store_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__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__store_u16le__no_bounds_check(
        d + (0 * 2), wuffs_base__load_u16le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[0] * 4)));
    wuffs_base__store_u16le__no_bounds_check(
        d + (1 * 2), wuffs_base__load_u16le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[1] * 4)));
    wuffs_base__store_u16le__no_bounds_check(
        d + (2 * 2), wuffs_base__load_u16le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[2] * 4)));
    wuffs_base__store_u16le__no_bounds_check(
        d + (3 * 2), wuffs_base__load_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__store_u16le__no_bounds_check(
        d + (0 * 2), wuffs_base__load_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_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__load_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[0] * 4));
    if (s0) {
      wuffs_base__store_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__load_u32le__no_bounds_check(s + (0 * 4)));
    wuffs_base__store_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__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) {
    // Convert from 8-bit color to 16-bit color.
    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__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;

  // TODO: unroll.

  while (n >= 1) {
    uint32_t d0 = wuffs_base__load_u32le__no_bounds_check(d + (0 * 4));
    uint32_t s0 = wuffs_base__load_u32le__no_bounds_check(s + (0 * 4));
    wuffs_base__store_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__load_u32le__no_bounds_check(s + (0 * 4));
    wuffs_base__store_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__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__load_u32le__no_bounds_check(d + (0 * 4));
    uint32_t s0 = wuffs_base__load_u32le__no_bounds_check(s + (0 * 4));
    wuffs_base__store_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__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__store_u32le__no_bounds_check(
        d + (0 * 3), wuffs_base__load_u32le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[0] * 4)));
    wuffs_base__store_u32le__no_bounds_check(
        d + (1 * 3), wuffs_base__load_u32le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[1] * 4)));
    wuffs_base__store_u32le__no_bounds_check(
        d + (2 * 3), wuffs_base__load_u32le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[2] * 4)));
    wuffs_base__store_u32le__no_bounds_check(
        d + (3 * 3), wuffs_base__load_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__load_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[0] * 4));
    wuffs_base__store_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_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__load_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[0] * 4));
    if (s0) {
      wuffs_base__store_u24le__no_bounds_check(d + (0 * 3), s0);
    }
    uint32_t s1 = wuffs_base__load_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[1] * 4));
    if (s1) {
      wuffs_base__store_u24le__no_bounds_check(d + (1 * 3), s1);
    }
    uint32_t s2 = wuffs_base__load_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[2] * 4));
    if (s2) {
      wuffs_base__store_u24le__no_bounds_check(d + (2 * 3), s2);
    }
    uint32_t s3 = wuffs_base__load_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[3] * 4));
    if (s3) {
      wuffs_base__store_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__load_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[0] * 4));
    if (s0) {
      wuffs_base__store_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__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__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__store_u32le__no_bounds_check(
        d + (0 * 4), wuffs_base__load_u32le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[0] * 4)));
    wuffs_base__store_u32le__no_bounds_check(
        d + (1 * 4), wuffs_base__load_u32le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[1] * 4)));
    wuffs_base__store_u32le__no_bounds_check(
        d + (2 * 4), wuffs_base__load_u32le__no_bounds_check(
                         dst_palette_ptr + ((size_t)s[2] * 4)));
    wuffs_base__store_u32le__no_bounds_check(
        d + (3 * 4), wuffs_base__load_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__store_u32le__no_bounds_check(
        d + (0 * 4), wuffs_base__load_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__load_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[0] * 4));
    if (s0) {
      wuffs_base__store_u32le__no_bounds_check(d + (0 * 4), s0);
    }
    uint32_t s1 = wuffs_base__load_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[1] * 4));
    if (s1) {
      wuffs_base__store_u32le__no_bounds_check(d + (1 * 4), s1);
    }
    uint32_t s2 = wuffs_base__load_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[2] * 4));
    if (s2) {
      wuffs_base__store_u32le__no_bounds_check(d + (2 * 4), s2);
    }
    uint32_t s3 = wuffs_base__load_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[3] * 4));
    if (s3) {
      wuffs_base__store_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__load_u32le__no_bounds_check(dst_palette_ptr +
                                                          ((size_t)s[0] * 4));
    if (s0) {
      wuffs_base__store_u32le__no_bounds_check(d + (0 * 4), s0);
    }

    s += 1 * 1;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__xxxx__xxx(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__store_u32le__no_bounds_check(
        d + (0 * 4),
        0xFF000000 | wuffs_base__load_u24le__no_bounds_check(s + (0 * 3)));

    s += 1 * 3;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}

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;

  // TODO: unroll.

  while (n >= 1) {
    wuffs_base__store_u32le__no_bounds_check(
        d + (0 * 4), 0xFF000000 | (0x010101 * (uint32_t)s[0]));

    s += 1 * 1;
    d += 1 * 4;
    n -= 1;
  }

  return len;
}

// --------

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__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:
      return wuffs_base__pixel_swizzler__xxxx__y;
  }
  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_bgr_565_888(dst_palette,
                                                         src_palette) != 1024) {
        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,
                                                     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__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,
                                                     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;
  }
  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__xxxx__xxx;

    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;
}

// --------

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.src_pixfmt_bytes_per_pixel = 0;

  wuffs_base__pixel_swizzler__func func = NULL;
  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 (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__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;
  }

  p->private_impl.func = func;
  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__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 n = (*p->private_impl.func)(dst.ptr, dst.len, dst_palette.ptr,
                                         dst_palette.len, iop_r, io2_r - iop_r);
    *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;
}

#endif  // !defined(WUFFS_CONFIG__MODULES) ||
        // defined(WUFFS_CONFIG__MODULE__BASE) ||
        // defined(WUFFS_CONFIG__MODULE__BASE__PIXCONV)

#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

// ---------------- 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 initialize_flags) {
  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 ((initialize_flags & 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 ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      initialize_flags |= 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__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;
  }

  uint32_t v_s1 = 0;
  uint32_t v_s2 = 0;
  wuffs_base__slice_u8 v_remaining = {0};
  wuffs_base__slice_u8 v_p = {0};

  if (!self->private_impl.f_started) {
    self->private_impl.f_started = true;
    self->private_impl.f_state = 1;
  }
  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 = i_slice_p;
      v_p.len = 1;
      uint8_t* i_end0_p = i_slice_p.ptr + (i_slice_p.len / 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 / 1) * 1;
      while (v_p.ptr < i_end1_p) {
        v_s1 += ((uint32_t)(v_p.ptr[0]));
        v_s2 += v_s1;
        v_p.ptr += 1;
      }
    }
    v_s1 %= 65521;
    v_s2 %= 65521;
    a_x = v_remaining;
  }
  self->private_impl.f_state = (((v_s2 & 65535) << 16) | (v_s1 & 65535));
  return self->private_impl.f_state;
}

#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__unsupported_bmp_file =
    "#bmp: unsupported BMP file";
const char* wuffs_bmp__note__internal_note_short_read =
    "@bmp: internal note: short read";

// ---------------- Private Consts

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

static wuffs_base__status  //
wuffs_bmp__decoder__swizzle(wuffs_bmp__decoder* self,
                            wuffs_base__pixel_buffer* a_dst,
                            wuffs_base__io_buffer* a_src);

static wuffs_base__status  //
wuffs_bmp__decoder__skip_frame(wuffs_bmp__decoder* self,
                               wuffs_base__io_buffer* a_src);

// ---------------- 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 initialize_flags) {
  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 ((initialize_flags & 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 ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      initialize_flags |= 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_bitmap_info_len = 0;
  uint32_t v_width = 0;
  uint32_t v_height = 0;
  uint32_t v_planes = 0;
  uint32_t v_bits_per_pixel = 0;
  uint32_t v_compression = 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_bitmap_info_len =
        self->private_data.s_decode_image_config[0].v_bitmap_info_len;
    v_bits_per_pixel =
        self->private_data.s_decode_image_config[0].v_bits_per_pixel;
    v_compression = self->private_data.s_decode_image_config[0].v_compression;
  }
  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__load_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__load_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__load_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;
        }
      }
      v_bitmap_info_len = t_2;
    }
    if ((v_bitmap_info_len != 40) && (v_bitmap_info_len != 108) &&
        (v_bitmap_info_len != 124)) {
      status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
      goto exit;
    }
    if (self->private_impl.f_padding < v_bitmap_info_len) {
      status = wuffs_base__make_status(wuffs_bmp__error__bad_header);
      goto exit;
    }
    self->private_impl.f_padding -= v_bitmap_info_len;
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
      uint32_t t_3;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
        t_3 = wuffs_base__load_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(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 == 24) {
            t_3 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_3 += 8;
          *scratch |= ((uint64_t)(num_bits_3)) << 56;
        }
      }
      v_width = t_3;
    }
    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(10);
      uint32_t t_4;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
        t_4 = wuffs_base__load_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_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;
        }
      }
      v_height = t_4;
    }
    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 = ((0 - v_height) & 2147483647);
      self->private_impl.f_top_down = true;
    } else {
      self->private_impl.f_height = v_height;
    }
    {
      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__load_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__load_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;
        }
      }
      v_bits_per_pixel = t_6;
    }
    {
      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__load_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_compression = t_7;
    }
    if (v_bits_per_pixel == 0) {
      if (v_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 (v_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;
    } else if (v_bits_per_pixel == 24) {
      self->private_impl.f_bytes_per_row =
          ((((((uint64_t)(self->private_impl.f_width)) * 3) + 3) >> 2) << 2);
      self->private_impl.f_pad_per_row = (self->private_impl.f_width & 3);
      self->private_impl.f_pixfmt =
          wuffs_base__utility__make_pixel_format(2147485832);
    } else if (v_bits_per_pixel == 32) {
      self->private_impl.f_bytes_per_row =
          (((uint64_t)(self->private_impl.f_width)) * 4);
      self->private_impl.f_pad_per_row = 0;
      self->private_impl.f_pixfmt =
          wuffs_base__utility__make_pixel_format(2164295816);
    } else {
      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(18);
    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 (v_bitmap_info_len >= 108) {
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(19);
        uint32_t t_8;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
          t_8 = wuffs_base__load_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(20);
          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;
          }
        }
        self->private_impl.f_mask_r = t_8;
      }
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(21);
        uint32_t t_9;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
          t_9 = wuffs_base__load_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(22);
          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 == 24) {
              t_9 = ((uint32_t)(*scratch));
              break;
            }
            num_bits_9 += 8;
            *scratch |= ((uint64_t)(num_bits_9)) << 56;
          }
        }
        self->private_impl.f_mask_g = t_9;
      }
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(23);
        uint32_t t_10;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
          t_10 = wuffs_base__load_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(24);
          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 == 24) {
              t_10 = ((uint32_t)(*scratch));
              break;
            }
            num_bits_10 += 8;
            *scratch |= ((uint64_t)(num_bits_10)) << 56;
          }
        }
        self->private_impl.f_mask_b = t_10;
      }
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(25);
        uint32_t t_11;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
          t_11 = wuffs_base__load_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(26);
          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;
          }
        }
        self->private_impl.f_mask_a = t_11;
      }
      if ((v_compression == 3) && (self->private_impl.f_mask_r == 16711680) &&
          (self->private_impl.f_mask_g == 65280) &&
          (self->private_impl.f_mask_b == 255) &&
          (self->private_impl.f_mask_a == 4278190080)) {
        v_compression = 0;
      }
      self->private_data.s_decode_image_config[0].scratch =
          (v_bitmap_info_len - 56);
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(27);
      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 (v_compression != 0) {
      status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
      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, 2164295816, 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 = 1;

    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_bitmap_info_len =
      v_bitmap_info_len;
  self->private_data.s_decode_image_config[0].v_bits_per_pixel =
      v_bits_per_pixel;
  self->private_data.s_decode_image_config[0].v_compression = v_compression;

  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 < 1) {
      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 == 1) {
      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 == 2) {
      if (a_src) {
        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
      }
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
      status = wuffs_bmp__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;
      }
      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__update(
          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 = 2;

    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];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_call_sequence < 2) {
      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 == 2) {
    } 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_end = self->private_impl.f_height;
        self->private_impl.f_dst_y_inc = 1;
      } else {
        self->private_impl.f_dst_y = (self->private_impl.f_height - 1);
        self->private_impl.f_dst_y_end = 4294967295;
        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(a_dst), 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) {
        if (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        v_status = wuffs_bmp__decoder__swizzle(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_base__make_status(
                       wuffs_bmp__note__internal_note_short_read)
                       .repr) {
          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_impl.f_call_sequence = 3;

    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 (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

static wuffs_base__status  //
wuffs_bmp__decoder__swizzle(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__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__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, wuffs_base__make_empty_struct());
    }
  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_dst_y_end) {
          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),
          wuffs_base__utility__empty_slice_u8(), &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.skip_frame

static wuffs_base__status  //
wuffs_bmp__decoder__skip_frame(wuffs_bmp__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_skip_frame[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    self->private_data.s_skip_frame[0].scratch = self->private_impl.f_padding;
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
    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;
    self->private_data.s_skip_frame[0].scratch =
        (self->private_impl.f_bytes_per_row *
         ((uint64_t)(self->private_impl.f_height)));
    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;
    self->private_impl.f_call_sequence = 3;

    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 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 > 1) {
    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 > 2) {
    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 == 0) {
    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 = 1;
  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);
}

#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BMP)

#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,
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            1039043750,
        },
        {
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            2225303149, 4173482934, 1707977408, 861478454,  2924937024,
            3526875803, 1329085421, 720736557,  3086643291, 3415954816,
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            1195825833, 3662232543, 3933188933, 2002801203, 184645608,
            2517538462, 4089658462, 1858919720, 313391347,  2409765253,
            3644239219, 1144605701, 945318366,  2773977256, 3231326824,
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            1646078799, 4279421497, 2598330617, 131105167,  2075239508,
            3871229218, 2955604436, 757403810,  1363424633, 3427521551,
            2844163791, 881434553,  1223211618, 3588709140, 3854685070,
            2026779384, 78583587,   2577462869, 4235025557, 1633861091,
            486774840,  2148301134, 3600338360, 1268198606, 938871061,
            2868504675, 3476308643, 1379640277, 777684494,  3008718712,
            1310168890, 3541595724, 2943964055, 846639841,  1471879201,
            3400857943, 3067468940, 735723002,  2102298892, 3762382970,
            2619362721, 19901655,   1692534295, 4193118049, 2240594618,
            411247564,  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,
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            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, 91404282,   3163122706, 2918450795,
            336584067,  2400113305, 922028401,  663249672,  2658384096,
            2392450098, 929185754,  639587747,  2682555979, 82149713,
            3172883129, 2892181696, 362343208,  1091578037, 4176212829,
            3918960932, 1349337804, 3412872662, 1922537022, 1676344391,
            3658557359, 1111377379, 4224032267, 3937989746, 1396912026,
            3359776896, 1908013928, 1623494929, 3644803833, 2377615716,
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            2941083030, 381060734,  106748588,  3215393092, 2933549885,
            388083925,  2350956495, 903570471,  614862430,  2640172470,
            3386185259, 1882115523, 1632872378, 3634920530, 1135178568,
            4199721120, 3945775833, 1389631793, 1317531835, 4152109907,
            3858841898, 1610259138, 3304822232, 2097172016, 1820140617,
            3582394273, 2165193788, 955639764,  696815021,  2423477829,
            192043359,  2995356343, 2750736590, 437203750,  182808564,
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            3326266917, 2142836173, 1858371508, 3611272284, 1279175494,
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            2462715320, 2183156074, 1004243586, 715579643,  2472360723,
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            1867729183, 3601371895, 2222754758, 1032278062, 754596439,
            2499928511, 234942117,  3086693709, 2793824052, 528319708,
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        {
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        },
};

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

// ---------------- 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 initialize_flags) {
  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 ((initialize_flags & 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 ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      initialize_flags |= 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__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;
  }

  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 = i_slice_p;
    v_p.len = 16;
    uint8_t* i_end0_p = i_slice_p.ptr + (i_slice_p.len / 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 = i_slice_p.ptr + (i_slice_p.len / 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 / 1) * 1;
    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;
    }
  }
  self->private_impl.f_state = (4294967295 ^ v_s);
  return self->private_impl.f_state;
}

#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_fast(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 initialize_flags) {
  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 ((initialize_flags & 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 ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      initialize_flags |= 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__slice_u8__subslice_j(
            wuffs_base__make_slice_u8(self->private_data.f_history, 33025),
            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_ij(
            wuffs_base__make_slice_u8(self->private_data.f_history, 33025),
            (self->private_impl.f_history_index & 32767), 32768),
        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__slice_u8__subslice_j(
              wuffs_base__make_slice_u8(self->private_data.f_history, 33025),
              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__slice_u8__subslice_i(
          wuffs_base__make_slice_u8(self->private_data.f_history, 33025),
          32768),
      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);
        if (a_dst) {
          iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
        }
        v_status = t_0;
      }
      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);
        self->private_impl.f_n_bits += 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 (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        v_status =
            wuffs_deflate__decoder__decode_huffman_fast(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__load_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_fast

static wuffs_base__status  //
wuffs_deflate__decoder__decode_huffman_fast(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)) >= 258) &&
         (((uint64_t)(io2_a_src - iop_a_src)) >= 12)) {
    if (v_n_bits < 15) {
      v_bits |= (((uint32_t)(wuffs_base__load_u8be__no_bounds_check(iop_a_src)))
                 << v_n_bits);
      (iop_a_src += 1, wuffs_base__make_empty_struct());
      v_n_bits += 8;
      v_bits |= (((uint32_t)(wuffs_base__load_u8be__no_bounds_check(iop_a_src)))
                 << v_n_bits);
      (iop_a_src += 1, wuffs_base__make_empty_struct());
      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__store_u8be__no_bounds_check(
           iop_a_dst, ((uint8_t)(((v_table_entry >> 8) & 255)))),
       iop_a_dst += 1, wuffs_base__make_empty_struct());
      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__load_u8be__no_bounds_check(iop_a_src)))
             << v_n_bits);
        (iop_a_src += 1, wuffs_base__make_empty_struct());
        v_n_bits += 8;
        v_bits |=
            (((uint32_t)(wuffs_base__load_u8be__no_bounds_check(iop_a_src)))
             << v_n_bits);
        (iop_a_src += 1, wuffs_base__make_empty_struct());
        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__store_u8be__no_bounds_check(
             iop_a_dst, ((uint8_t)(((v_table_entry >> 8) & 255)))),
         iop_a_dst += 1, wuffs_base__make_empty_struct());
        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__load_u8be__no_bounds_check(iop_a_src)))
             << v_n_bits);
        (iop_a_src += 1, wuffs_base__make_empty_struct());
        v_n_bits += 8;
        v_bits |=
            (((uint32_t)(wuffs_base__load_u8be__no_bounds_check(iop_a_src)))
             << v_n_bits);
        (iop_a_src += 1, wuffs_base__make_empty_struct());
        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__load_u8be__no_bounds_check(iop_a_src)))
                 << v_n_bits);
      (iop_a_src += 1, wuffs_base__make_empty_struct());
      v_n_bits += 8;
      v_bits |= (((uint32_t)(wuffs_base__load_u8be__no_bounds_check(iop_a_src)))
                 << v_n_bits);
      (iop_a_src += 1, wuffs_base__make_empty_struct());
      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__load_u8be__no_bounds_check(iop_a_src)))
             << v_n_bits);
        (iop_a_src += 1, wuffs_base__make_empty_struct());
        v_n_bits += 8;
        v_bits |=
            (((uint32_t)(wuffs_base__load_u8be__no_bounds_check(iop_a_src)))
             << v_n_bits);
        (iop_a_src += 1, wuffs_base__make_empty_struct());
        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__load_u8be__no_bounds_check(iop_a_src)))
                 << v_n_bits);
      (iop_a_src += 1, wuffs_base__make_empty_struct());
      v_n_bits += 8;
      v_bits |= (((uint32_t)(wuffs_base__load_u8be__no_bounds_check(iop_a_src)))
                 << v_n_bits);
      (iop_a_src += 1, wuffs_base__make_empty_struct());
      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))) {
          status = wuffs_base__make_status(
              wuffs_deflate__error__internal_error_inconsistent_distance);
          goto exit;
        }
      }
      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--, wuffs_base__make_empty_struct());
    } 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_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_ij(
                    wuffs_base__make_slice_u8(self->private_data.f_history,
                                              33025),
                    (v_hdist & 32767), 32768));
            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 = ((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_ij(
                      wuffs_base__make_slice_u8(self->private_data.f_history,
                                                33025),
                      (v_hdist & 32767), 32768));
              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 initialize_flags) {
  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 ((initialize_flags & 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 ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      initialize_flags |= 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 |=
            (wuffs_base__load_u32le__no_bounds_check(iop_a_src) << v_n_bits);
        (iop_a_src += ((31 - v_n_bits) >> 3), wuffs_base__make_empty_struct());
        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__load_u8be__no_bounds_check(iop_a_src)))
             << v_n_bits);
        (iop_a_src += 1, wuffs_base__make_empty_struct());
        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__load_u8be__no_bounds_check(iop_a_src)))
               << v_n_bits);
          (iop_a_src += 1, wuffs_base__make_empty_struct());
          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 = ((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 = ((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 = ((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--, wuffs_base__make_empty_struct());
      } 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 =
          ((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__config_decoder__skip_frame(wuffs_gif__config_decoder* self,
                                      wuffs_base__io_buffer* a_src);

static wuffs_base__empty_struct  //
wuffs_gif__config_decoder__reset_gc(wuffs_gif__config_decoder* self);

static wuffs_base__status  //
wuffs_gif__config_decoder__decode_up_to_id_part1(
    wuffs_gif__config_decoder* self,
    wuffs_base__io_buffer* a_src);

static wuffs_base__status  //
wuffs_gif__config_decoder__decode_header(wuffs_gif__config_decoder* self,
                                         wuffs_base__io_buffer* a_src);

static wuffs_base__status  //
wuffs_gif__config_decoder__decode_lsd(wuffs_gif__config_decoder* self,
                                      wuffs_base__io_buffer* a_src);

static wuffs_base__status  //
wuffs_gif__config_decoder__decode_extension(wuffs_gif__config_decoder* self,
                                            wuffs_base__io_buffer* a_src);

static wuffs_base__status  //
wuffs_gif__config_decoder__skip_blocks(wuffs_gif__config_decoder* self,
                                       wuffs_base__io_buffer* a_src);

static wuffs_base__status  //
wuffs_gif__config_decoder__decode_ae(wuffs_gif__config_decoder* self,
                                     wuffs_base__io_buffer* a_src);

static wuffs_base__status  //
wuffs_gif__config_decoder__decode_gc(wuffs_gif__config_decoder* self,
                                     wuffs_base__io_buffer* a_src);

static wuffs_base__status  //
wuffs_gif__config_decoder__decode_id_part0(wuffs_gif__config_decoder* self,
                                           wuffs_base__io_buffer* a_src);

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__config_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__config_decoder__decode_frame),
        (wuffs_base__status(*)(void*,
                               wuffs_base__frame_config*,
                               wuffs_base__io_buffer*))(
            &wuffs_gif__config_decoder__decode_frame_config),
        (wuffs_base__status(*)(void*,
                               wuffs_base__image_config*,
                               wuffs_base__io_buffer*))(
            &wuffs_gif__config_decoder__decode_image_config),
        (wuffs_base__rect_ie_u32(*)(const void*))(
            &wuffs_gif__config_decoder__frame_dirty_rect),
        (uint32_t(*)(const void*))(
            &wuffs_gif__config_decoder__num_animation_loops),
        (uint64_t(*)(const void*))(
            &wuffs_gif__config_decoder__num_decoded_frame_configs),
        (uint64_t(*)(const void*))(
            &wuffs_gif__config_decoder__num_decoded_frames),
        (wuffs_base__status(*)(void*, uint64_t, uint64_t))(
            &wuffs_gif__config_decoder__restart_frame),
        (wuffs_base__empty_struct(*)(void*, uint32_t, bool))(
            &wuffs_gif__config_decoder__set_quirk_enabled),
        (wuffs_base__empty_struct(*)(void*, uint32_t, bool))(
            &wuffs_gif__config_decoder__set_report_metadata),
        (wuffs_base__status(*)(void*,
                               wuffs_base__io_buffer*,
                               wuffs_base__more_information*,
                               wuffs_base__io_buffer*))(
            &wuffs_gif__config_decoder__tell_me_more),
        (wuffs_base__range_ii_u64(*)(const void*))(
            &wuffs_gif__config_decoder__workbuf_len),
};

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__config_decoder__initialize(wuffs_gif__config_decoder* self,
                                      size_t sizeof_star_self,
                                      uint64_t wuffs_version,
                                      uint32_t initialize_flags) {
  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 ((initialize_flags & 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 ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      initialize_flags |= 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_gif__config_decoder__func_ptrs_for__wuffs_base__image_decoder);
  return wuffs_base__make_status(NULL);
}

wuffs_gif__config_decoder*  //
wuffs_gif__config_decoder__alloc() {
  wuffs_gif__config_decoder* x = (wuffs_gif__config_decoder*)(calloc(
      sizeof(wuffs_gif__config_decoder), 1));
  if (!x) {
    return NULL;
  }
  if (wuffs_gif__config_decoder__initialize(
          x, sizeof(wuffs_gif__config_decoder), WUFFS_VERSION,
          WUFFS_INITIALIZE__ALREADY_ZEROED)
          .repr) {
    free(x);
    return NULL;
  }
  return x;
}

size_t  //
sizeof__wuffs_gif__config_decoder() {
  return sizeof(wuffs_gif__config_decoder);
}

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 initialize_flags) {
  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 ((initialize_flags & 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 ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      initialize_flags |= 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, initialize_flags);
    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.config_decoder.set_quirk_enabled

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
wuffs_gif__config_decoder__set_quirk_enabled(wuffs_gif__config_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.config_decoder.decode_image_config

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gif__config_decoder__decode_image_config(wuffs_gif__config_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__config_decoder__decode_header(self, a_src);
      if (status.repr) {
        goto suspend;
      }
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
      status = wuffs_gif__config_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__config_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.config_decoder.set_report_metadata

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
wuffs_gif__config_decoder__set_report_metadata(wuffs_gif__config_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.config_decoder.tell_me_more

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gif__config_decoder__tell_me_more(wuffs_gif__config_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__load_u8be__no_bounds_check(iop_a_src)));
      if (v_chunk_length <= 0) {
        (iop_a_src += 1, wuffs_base__make_empty_struct());
        goto label__1__break;
      }
      if (self->private_impl.f_metadata_fourcc == 1481461792) {
        v_chunk_length += 1;
      } else {
        (iop_a_src += 1, wuffs_base__make_empty_struct());
      }
      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.config_decoder.num_animation_loops

WUFFS_BASE__MAYBE_STATIC uint32_t  //
wuffs_gif__config_decoder__num_animation_loops(
    const wuffs_gif__config_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.config_decoder.num_decoded_frame_configs

WUFFS_BASE__MAYBE_STATIC uint64_t  //
wuffs_gif__config_decoder__num_decoded_frame_configs(
    const wuffs_gif__config_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.config_decoder.num_decoded_frames

WUFFS_BASE__MAYBE_STATIC uint64_t  //
wuffs_gif__config_decoder__num_decoded_frames(
    const wuffs_gif__config_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.config_decoder.frame_dirty_rect

WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32  //
wuffs_gif__config_decoder__frame_dirty_rect(
    const wuffs_gif__config_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__empty_rect_ie_u32();
}

// -------- func gif.config_decoder.workbuf_len

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
wuffs_gif__config_decoder__workbuf_len(const wuffs_gif__config_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 gif.config_decoder.restart_frame

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gif__config_decoder__restart_frame(wuffs_gif__config_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 == 0) {
    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__config_decoder__reset_gc(self);
  return wuffs_base__make_status(NULL);
}

// -------- func gif.config_decoder.decode_frame_config

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gif__config_decoder__decode_frame_config(wuffs_gif__config_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;
    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__config_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__config_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__config_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__load_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__update(
          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.config_decoder.skip_frame

static wuffs_base__status  //
wuffs_gif__config_decoder__skip_frame(wuffs_gif__config_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__config_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__config_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.config_decoder.decode_frame

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gif__config_decoder__decode_frame(
    wuffs_gif__config_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);

  status = wuffs_base__make_status(wuffs_base__error__unsupported_method);
  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 gif.config_decoder.reset_gc

static wuffs_base__empty_struct  //
wuffs_gif__config_decoder__reset_gc(wuffs_gif__config_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.config_decoder.decode_up_to_id_part1

static wuffs_base__status  //
wuffs_gif__config_decoder__decode_up_to_id_part1(
    wuffs_gif__config_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__config_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__config_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.config_decoder.decode_header

static wuffs_base__status  //
wuffs_gif__config_decoder__decode_header(wuffs_gif__config_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.config_decoder.decode_lsd

static wuffs_base__status  //
wuffs_gif__config_decoder__decode_lsd(wuffs_gif__config_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__load_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__load_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__load_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.config_decoder.decode_extension

static wuffs_base__status  //
wuffs_gif__config_decoder__decode_extension(wuffs_gif__config_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__config_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__config_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__config_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.config_decoder.skip_blocks

static wuffs_base__status  //
wuffs_gif__config_decoder__skip_blocks(wuffs_gif__config_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.config_decoder.decode_ae

static wuffs_base__status  //
wuffs_gif__config_decoder__decode_ae(wuffs_gif__config_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__load_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__config_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.config_decoder.decode_gc

static wuffs_base__status  //
wuffs_gif__config_decoder__decode_gc(wuffs_gif__config_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__load_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.config_decoder.decode_id_part0

static wuffs_base__status  //
wuffs_gif__config_decoder__decode_id_part0(wuffs_gif__config_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__load_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__load_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__load_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__load_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;
    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.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__load_u8be__no_bounds_check(iop_a_src)));
      if (v_chunk_length <= 0) {
        (iop_a_src += 1, wuffs_base__make_empty_struct());
        goto label__1__break;
      }
      if (self->private_impl.f_metadata_fourcc == 1481461792) {
        v_chunk_length += 1;
      } else {
        (iop_a_src += 1, wuffs_base__make_empty_struct());
      }
      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 == 0) {
    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__load_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__update(
          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__load_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__load_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__load_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__load_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__load_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__load_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__load_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__load_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__load_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__slice_u8 v_dst_palette = {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__load_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_dst_palette = wuffs_base__pixel_buffer__palette(a_dst);
    if (((uint64_t)(v_dst_palette.len)) == 0) {
      v_dst_palette =
          wuffs_base__make_slice_u8(self->private_data.f_dst_palette, 1024);
    }
    v_status = wuffs_base__pixel_swizzler__prepare(
        &self->private_impl.f_swizzler,
        wuffs_base__pixel_buffer__pixel_format(a_dst), v_dst_palette,
        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__load_u8be__no_bounds_check(iop_a_src)));
        (iop_a_src += 1, wuffs_base__make_empty_struct());
      }
    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());
            iop_v_r = u_r.data.ptr + u_r.meta.ri;
            v_lzw_status = t_1;
          }
          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__make_status(wuffs_base__suspension__short_read)
                       .repr) {
          goto label__outer__continue;
        } else if (v_lzw_status.repr ==
                   wuffs_base__make_status(wuffs_base__suspension__short_write)
                       .repr) {
          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 initialize_flags) {
  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 ((initialize_flags & 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 ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      initialize_flags |= 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, initialize_flags);
    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, initialize_flags);
    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_ignore_checksum

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
wuffs_gzip__decoder__set_ignore_checksum(wuffs_gzip__decoder* self, bool a_ic) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }

  self->private_impl.f_ignore_checksum = a_ic;
  return wuffs_base__make_empty_struct();
}

// -------- 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) {
  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__load_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);
        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;
        }
        v_status = t_7;
      }
      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__load_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__load_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__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, 9,
};

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

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 18

// ---------------- 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_trailing_new_line(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 initialize_flags) {
  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 ((initialize_flags & 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 ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      initialize_flags |= 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 < 18) {
      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;
  uint32_t v_backslash_x_length = 0;
  uint8_t v_backslash_x_ok = 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[14] || self->private_impl.f_quirks[15]) {
      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__load_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, wuffs_base__make_empty_struct());
          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)(4194323)) << 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, wuffs_base__make_empty_struct());
        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)(4194337))
                       << 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__load_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, wuffs_base__make_empty_struct());
                if (v_string_length > 65527) {
                  *iop_a_dst++ = wuffs_base__make_token(
                      (((uint64_t)(4194337))
                       << 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__load_u8be__no_bounds_check(iop_a_src);
              v_char = WUFFS_JSON__LUT_CHARS[v_c];
              if (v_char == 0) {
                (iop_a_src += 1, wuffs_base__make_empty_struct());
                if (v_string_length >= 65531) {
                  *iop_a_dst++ = wuffs_base__make_token(
                      (((uint64_t)(4194337))
                       << 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)(4194337))
                       << 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)(4194337))
                       << 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__load_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, wuffs_base__make_empty_struct());
                  *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, wuffs_base__make_empty_struct());
                    *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__load_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, wuffs_base__make_empty_struct());
                    *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[17]) {
                          (iop_a_src += 6, wuffs_base__make_empty_struct());
                          *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__load_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, wuffs_base__make_empty_struct());
                      *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[17]) {
                    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, wuffs_base__make_empty_struct());
                    *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__load_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, wuffs_base__make_empty_struct());
                    *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[17]) {
                    (iop_a_src += 10, wuffs_base__make_empty_struct());
                    *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[8]) {
                  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_length = 0;
                  while ((v_backslash_x_length <= 65531) &&
                         (((uint64_t)(io2_a_src - iop_a_src)) >= 4)) {
                    v_backslash_x_string =
                        wuffs_base__load_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_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(
                        255 & (v_backslash_x_string >> 24))];
                    v_backslash_x_ok &= v_c;
                    if ((v_backslash_x_ok == 0) ||
                        ((v_backslash_x_string & 65535) != 30812)) {
                      goto label__1__break;
                    }
                    (iop_a_src += 4, wuffs_base__make_empty_struct());
                    v_backslash_x_length += 4;
                  }
                label__1__break:;
                  if (v_backslash_x_length == 0) {
                    status = wuffs_base__make_status(
                        wuffs_json__error__bad_backslash_escape);
                    goto exit;
                  }
                  *iop_a_dst++ = wuffs_base__make_token(
                      (((uint64_t)(4194432))
                       << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                      (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
                      (((uint64_t)(v_backslash_x_length))
                       << 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)(4194337))
                         << 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[17]) {
                      *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, wuffs_base__make_empty_struct());
                      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__load_u16le__no_bounds_check(iop_a_src)));
                if ((v_multi_byte_utf8 & 49152) == 32768) {
                  v_multi_byte_utf8 = ((1984 & (v_multi_byte_utf8 << 6)) |
                                       (63 & (v_multi_byte_utf8 >> 8)));
                  (iop_a_src += 2, wuffs_base__make_empty_struct());
                  if (v_string_length >= 65528) {
                    *iop_a_dst++ = wuffs_base__make_token(
                        (((uint64_t)(4194337))
                         << 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)(4194337))
                         << 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[17]) {
                      *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, wuffs_base__make_empty_struct());
                      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__load_u24le__no_bounds_check(iop_a_src)));
                if ((v_multi_byte_utf8 & 12632064) == 8421376) {
                  v_multi_byte_utf8 = ((61440 & (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, wuffs_base__make_empty_struct());
                    if (v_string_length >= 65528) {
                      *iop_a_dst++ = wuffs_base__make_token(
                          (((uint64_t)(4194337))
                           << 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)(4194337))
                         << 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[17]) {
                      *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, wuffs_base__make_empty_struct());
                      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__load_u32le__no_bounds_check(iop_a_src);
                if ((v_multi_byte_utf8 & 3233857536) == 2155905024) {
                  v_multi_byte_utf8 = ((1835008 & (v_multi_byte_utf8 << 18)) |
                                       (258048 & (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, wuffs_base__make_empty_struct());
                    if (v_string_length >= 65528) {
                      *iop_a_dst++ = wuffs_base__make_token(
                          (((uint64_t)(4194337))
                           << 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)(4194337))
                     << 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, wuffs_base__make_empty_struct());
                  goto label__string_loop_outer__continue;
                }
                status = wuffs_base__make_status(
                    wuffs_json__error__bad_c0_control_code);
                goto exit;
              }
              if (self->private_impl.f_quirks[17]) {
                *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, wuffs_base__make_empty_struct());
                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__2__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__2__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__2__continue;
            }
            (iop_a_src += 1, wuffs_base__make_empty_struct());
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(4194323))
                 << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            goto label__2__break;
          }
        label__2__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, wuffs_base__make_empty_struct());
          *iop_a_dst++ = wuffs_base__make_token(
              (((uint64_t)(0)) << 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[12]) {
              v_expect = 4162;
            } else {
              v_expect = 4098;
            }
          } else {
            if (self->private_impl.f_quirks[12]) {
              v_expect = 8114;
            } else {
              v_expect = 7858;
            }
          }
          goto label__outer__continue;
        } else if (v_class == 3) {
          (iop_a_src += 1, wuffs_base__make_empty_struct());
          *iop_a_dst++ = wuffs_base__make_token(
              (((uint64_t)(0)) << 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__3__break;
            }
            while (v_number_length > 0) {
              v_number_length -= 1;
              if (iop_a_src > io1_a_src) {
                (iop_a_src--, wuffs_base__make_empty_struct());
              } 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[13]) {
                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__3__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__3__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, wuffs_base__make_empty_struct());
          *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, wuffs_base__make_empty_struct());
          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, wuffs_base__make_empty_struct());
          *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, wuffs_base__make_empty_struct());
          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, wuffs_base__make_empty_struct());
            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, wuffs_base__make_empty_struct());
            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, wuffs_base__make_empty_struct());
            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[13]) {
            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[10] ||
              self->private_impl.f_quirks[11]) {
            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;
            }
            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[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(24);
      status =
          wuffs_json__decoder__decode_trailing_new_line(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__load_u8be__no_bounds_check(iop_a_src);
    if (v_c != 45) {
    } else {
      v_n += 1;
      (iop_a_src += 1, wuffs_base__make_empty_struct());
      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__load_u8be__no_bounds_check(iop_a_src);
    }
    if (v_c == 48) {
      v_n += 1;
      (iop_a_src += 1, wuffs_base__make_empty_struct());
    } 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__load_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, wuffs_base__make_empty_struct());
      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__load_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, wuffs_base__make_empty_struct());
    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__load_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, wuffs_base__make_empty_struct());
    }
    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__load_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, wuffs_base__make_empty_struct());
  }
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[14];
    self->private_impl.f_allow_leading_ubom = self->private_impl.f_quirks[15];
  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__load_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, wuffs_base__make_empty_struct());
        *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__load_u24le__no_bounds_check(iop_a_src)));
        if (v_u == 12565487) {
          self->private_impl.f_allow_leading_ubom = false;
          (iop_a_src += 3, wuffs_base__make_empty_struct());
          *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;

  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(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);
    }
    v_c2 = wuffs_base__load_u16le__no_bounds_check(iop_a_src);
    if ((v_c2 == 10799) && self->private_impl.f_quirks[10]) {
      (iop_a_src += 2, wuffs_base__make_empty_struct());
      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__load_u16le__no_bounds_check(iop_a_src);
          if (v_c2 == 12074) {
            (iop_a_src += 2, wuffs_base__make_empty_struct());
            *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));
            status = wuffs_base__make_status(NULL);
            goto ok;
          }
          (iop_a_src += 1, wuffs_base__make_empty_struct());
          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[11]) {
      (iop_a_src += 2, wuffs_base__make_empty_struct());
      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)(1)) << 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__load_u8be__no_bounds_check(iop_a_src);
          if (v_c == 10) {
            (iop_a_src += 1, wuffs_base__make_empty_struct());
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(1)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
                (((uint64_t)((v_length + 1)))
                 << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
            status = wuffs_base__make_status(NULL);
            goto ok;
          }
          (iop_a_src += 1, wuffs_base__make_empty_struct());
          if (v_length >= 65533) {
            *iop_a_dst++ = wuffs_base__make_token(
                (((uint64_t)(1)) << 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;
        }
      }
    }
    status = wuffs_base__make_status(wuffs_json__error__bad_input);
    goto exit;
    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__load_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__load_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, wuffs_base__make_empty_struct());
            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, wuffs_base__make_empty_struct());
        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, wuffs_base__make_empty_struct());
        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__load_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__load_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, wuffs_base__make_empty_struct());
            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, wuffs_base__make_empty_struct());
        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, wuffs_base__make_empty_struct());
        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_trailing_new_line

static wuffs_base__status  //
wuffs_json__decoder__decode_trailing_new_line(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_trailing_new_line[0];
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_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__load_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;
          }
          status = wuffs_base__make_status(wuffs_json__error__bad_input);
          goto exit;
        }
        (iop_a_src += 1, wuffs_base__make_empty_struct());
        if ((v_whitespace_length >= 65534) || (v_c == 10)) {
          *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 == 10) {
            goto label__outer__break;
          }
          goto label__outer__continue;
        }
        v_whitespace_length += 1;
      }
    }
  label__outer__break:;

    goto ok;
  ok:
    self->private_impl.p_decode_trailing_new_line[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_decode_trailing_new_line[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__WBMP)

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

const char* wuffs_wbmp__error__bad_header = "#wbmp: bad header";

// ---------------- Private Consts

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

static wuffs_base__status  //
wuffs_wbmp__decoder__skip_frame(wuffs_wbmp__decoder* self,
                                wuffs_base__io_buffer* a_src);

// ---------------- 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 initialize_flags) {
  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 ((initialize_flags & 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 ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      initialize_flags |= 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 = 1;

    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 < 1) {
      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 == 1) {
      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 == 2) {
      if (a_src) {
        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
      }
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
      status = wuffs_wbmp__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;
      }
      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__update(
          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 = 2;

    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 < 2) {
      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 == 2) {
    } 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__load_u8be__no_bounds_check(iop_a_src);
            (iop_a_src += 1, wuffs_base__make_empty_struct());
          }
          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 = 3;

    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.skip_frame

static wuffs_base__status  //
wuffs_wbmp__decoder__skip_frame(wuffs_wbmp__decoder* self,
                                wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = wuffs_base__make_status(NULL);

  uint64_t v_bytes_per_row = 0;
  uint64_t v_total_bytes = 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;

    v_bytes_per_row = ((((uint64_t)(self->private_impl.f_width)) + 7) / 8);
    v_total_bytes =
        (v_bytes_per_row * ((uint64_t)(self->private_impl.f_height)));
    self->private_data.s_skip_frame[0].scratch = v_total_bytes;
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
    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;
    self->private_impl.f_call_sequence = 3;

    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 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 > 1) {
    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 > 2) {
    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 == 0) {
    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 = 1;
  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(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 initialize_flags) {
  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 ((initialize_flags & 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 ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      initialize_flags |= 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, initialize_flags);
    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,
        initialize_flags);
    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, initialize_flags);
    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_ignore_checksum

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
wuffs_zlib__decoder__set_ignore_checksum(wuffs_zlib__decoder* self, bool a_ic) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }

  self->private_impl.f_ignore_checksum = a_ic;
  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) {
  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__load_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__load_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);
        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;
        }
        v_status = t_2;
      }
      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__load_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)

#endif  // WUFFS_IMPLEMENTATION

#ifdef __clang__
#pragma clang diagnostic pop
#endif

#endif  // WUFFS_INCLUDE_GUARD