diff --git a/release/c/README.md b/release/c/README.md
new file mode 100644
index 0000000..73f42f8
--- /dev/null
+++ b/release/c/README.md
@@ -0,0 +1,23 @@
+# Releases (in the C Programming Language)
+
+[Wuffs the Library](/doc/wuffs-the-library.md) ships as a "single file C
+library", also known as a "[header file
+library](https://github.com/nothings/stb/blob/master/docs/stb_howto.txt)".
+
+To use that library in your C/C++ project, you just need to copy one file from
+this directory, or otherwise integrate that one file into your build system.
+Typically, pick the latest stable version (but not the unsupported snapshot),
+with a filename like `wuffs-vMAJOR.MINOR.c` for version MAJOR.MINOR.
+
+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.
+
+
+# Latest Stable Version
+
+**Version 0.2 (December 2019)** is the latest stable version. Stable means that
+its API won't change any further, but being a "version 0.x" means that:
+
+- It will not have long term support.
+- Newer versions make no promises about compatibility.
diff --git a/release/c/wuffs-v0.2.c b/release/c/wuffs-v0.2.c
new file mode 100644
index 0000000..f26262a
--- /dev/null
+++ b/release/c/wuffs-v0.2.c
@@ -0,0 +1,11858 @@
+#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.
+
+// 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 <string.h>
+
+// GCC does not warn for unused *static inline* functions, but clang does.
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-function"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#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
+
+// 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.
+//
+// WUFFS_VERSION was overridden by "wuffs gen -version" based on revision
+// b36c9f019f2908639b0bb4dd5b8337bb3daf3271 committed on 2019-12-19.
+#define WUFFS_VERSION ((uint64_t)0x0000000000020000)
+#define WUFFS_VERSION_MAJOR ((uint64_t)0x00000000)
+#define WUFFS_VERSION_MINOR ((uint64_t)0x0002)
+#define WUFFS_VERSION_PATCH ((uint64_t)0x0000)
+#define WUFFS_VERSION_PRE_RELEASE_LABEL ""
+#define WUFFS_VERSION_BUILD_METADATA_COMMIT_COUNT 2078
+#define WUFFS_VERSION_BUILD_METADATA_COMMIT_DATE 20191219
+#define WUFFS_VERSION_STRING "0.2.0+2078.20191219"
+
+// 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
+
+#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;
+
+// --------
+
+// See https://github.com/google/wuffs/blob/master/doc/note/statuses.md
+typedef const char* wuffs_base__status;
+
+extern const char* wuffs_base__warning__end_of_data;
+extern const char* wuffs_base__warning__metadata_reported;
+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_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__not_enough_data;
+extern const char* wuffs_base__error__unsupported_option;
+extern const char* wuffs_base__error__too_much_data;
+
+static inline bool  //
+wuffs_base__status__is_complete(wuffs_base__status z) {
+  return (z == NULL) || ((*z != '$') && (*z != '#'));
+}
+
+static inline bool  //
+wuffs_base__status__is_error(wuffs_base__status z) {
+  return z && (*z == '#');
+}
+
+static inline bool  //
+wuffs_base__status__is_ok(wuffs_base__status z) {
+  return z == NULL;
+}
+
+static inline bool  //
+wuffs_base__status__is_suspension(wuffs_base__status z) {
+  return z && (*z == '$');
+}
+
+static inline bool  //
+wuffs_base__status__is_warning(wuffs_base__status z) {
+  return z && (*z != '$') && (*z != '#');
+}
+
+// wuffs_base__status__message strips the leading '$', '#' or '@'.
+static inline const char*  //
+wuffs_base__status__message(wuffs_base__status z) {
+  if (z) {
+    if ((*z == '$') || (*z == '#') || (*z == '@')) {
+      return z + 1;
+    }
+  }
+  return z;
+}
+
+// --------
+
+// FourCC constants.
+
+// International Color Consortium Profile.
+#define WUFFS_BASE__FOURCC__ICCP 0x49434350
+
+// 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
+
+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;
+}
+
+// ---------------- 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__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__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__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__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__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__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
+
+// ---------------- 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 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__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;
+}
+
+// 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 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
+
+// ---------------- 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. It is in word order, not
+// byte order: its value is always 0xAARRGGBB, regardless of endianness.
+typedef uint32_t wuffs_base__color_u32_argb_premul;
+
+// --------
+
+// 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 uint32_t wuffs_base__pixel_format;
+
+// 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 ((wuffs_base__pixel_format)0x00000000)
+
+#define WUFFS_BASE__PIXEL_FORMAT__A ((wuffs_base__pixel_format)0x02000008)
+
+#define WUFFS_BASE__PIXEL_FORMAT__Y ((wuffs_base__pixel_format)0x10000008)
+#define WUFFS_BASE__PIXEL_FORMAT__YA_NONPREMUL \
+  ((wuffs_base__pixel_format)0x15000008)
+#define WUFFS_BASE__PIXEL_FORMAT__YA_PREMUL \
+  ((wuffs_base__pixel_format)0x16000008)
+
+#define WUFFS_BASE__PIXEL_FORMAT__YCBCR ((wuffs_base__pixel_format)0x20020888)
+#define WUFFS_BASE__PIXEL_FORMAT__YCBCRK ((wuffs_base__pixel_format)0x21038888)
+#define WUFFS_BASE__PIXEL_FORMAT__YCBCRA_NONPREMUL \
+  ((wuffs_base__pixel_format)0x25038888)
+
+#define WUFFS_BASE__PIXEL_FORMAT__YCOCG ((wuffs_base__pixel_format)0x30020888)
+#define WUFFS_BASE__PIXEL_FORMAT__YCOCGK ((wuffs_base__pixel_format)0x31038888)
+#define WUFFS_BASE__PIXEL_FORMAT__YCOCGA_NONPREMUL \
+  ((wuffs_base__pixel_format)0x35038888)
+
+#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL \
+  ((wuffs_base__pixel_format)0x45040008)
+#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_PREMUL \
+  ((wuffs_base__pixel_format)0x46040008)
+#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY \
+  ((wuffs_base__pixel_format)0x47040008)
+
+#define WUFFS_BASE__PIXEL_FORMAT__BGR ((wuffs_base__pixel_format)0x40000888)
+#define WUFFS_BASE__PIXEL_FORMAT__BGRX ((wuffs_base__pixel_format)0x41008888)
+#define WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL \
+  ((wuffs_base__pixel_format)0x45008888)
+#define WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL \
+  ((wuffs_base__pixel_format)0x46008888)
+#define WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY \
+  ((wuffs_base__pixel_format)0x47008888)
+
+#define WUFFS_BASE__PIXEL_FORMAT__RGB ((wuffs_base__pixel_format)0x50000888)
+#define WUFFS_BASE__PIXEL_FORMAT__RGBX ((wuffs_base__pixel_format)0x51008888)
+#define WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL \
+  ((wuffs_base__pixel_format)0x55008888)
+#define WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL \
+  ((wuffs_base__pixel_format)0x56008888)
+#define WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY \
+  ((wuffs_base__pixel_format)0x57008888)
+
+#define WUFFS_BASE__PIXEL_FORMAT__CMY ((wuffs_base__pixel_format)0x60020888)
+#define WUFFS_BASE__PIXEL_FORMAT__CMYK ((wuffs_base__pixel_format)0x61038888)
+
+extern const uint32_t wuffs_base__pixel_format__bits_per_channel[16];
+
+static inline bool  //
+wuffs_base__pixel_format__is_valid(wuffs_base__pixel_format f) {
+  return f != 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(wuffs_base__pixel_format f) {
+  if (((f >> 16) & 0x03) != 0) {
+    return 0;
+  }
+  return wuffs_base__pixel_format__bits_per_channel[0x0F & (f >> 0)] +
+         wuffs_base__pixel_format__bits_per_channel[0x0F & (f >> 4)] +
+         wuffs_base__pixel_format__bits_per_channel[0x0F & (f >> 8)] +
+         wuffs_base__pixel_format__bits_per_channel[0x0F & (f >> 12)];
+}
+
+static inline bool  //
+wuffs_base__pixel_format__is_indexed(wuffs_base__pixel_format f) {
+  return (f >> 18) & 0x01;
+}
+
+static inline bool  //
+wuffs_base__pixel_format__is_interleaved(wuffs_base__pixel_format f) {
+  return ((f >> 16) & 0x03) == 0;
+}
+
+static inline bool  //
+wuffs_base__pixel_format__is_planar(wuffs_base__pixel_format f) {
+  return ((f >> 16) & 0x03) != 0;
+}
+
+static inline uint32_t  //
+wuffs_base__pixel_format__num_planes(wuffs_base__pixel_format f) {
+  return ((f >> 16) & 0x03) + 1;
+}
+
+#define WUFFS_BASE__PIXEL_FORMAT__NUM_PLANES_MAX 4
+
+#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__INDEX_PLANE 0
+#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__COLOR_PLANE 3
+
+// --------
+
+// wuffs_base__pixel_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 uint32_t wuffs_base__pixel_subsampling;
+
+#define WUFFS_BASE__PIXEL_SUBSAMPLING__NONE ((wuffs_base__pixel_subsampling)0)
+
+#define WUFFS_BASE__PIXEL_SUBSAMPLING__444 \
+  ((wuffs_base__pixel_subsampling)0x000000)
+#define WUFFS_BASE__PIXEL_SUBSAMPLING__440 \
+  ((wuffs_base__pixel_subsampling)0x010100)
+#define WUFFS_BASE__PIXEL_SUBSAMPLING__422 \
+  ((wuffs_base__pixel_subsampling)0x101000)
+#define WUFFS_BASE__PIXEL_SUBSAMPLING__420 \
+  ((wuffs_base__pixel_subsampling)0x111100)
+#define WUFFS_BASE__PIXEL_SUBSAMPLING__411 \
+  ((wuffs_base__pixel_subsampling)0x303000)
+#define WUFFS_BASE__PIXEL_SUBSAMPLING__410 \
+  ((wuffs_base__pixel_subsampling)0x313100)
+
+static inline uint32_t  //
+wuffs_base__pixel_subsampling__bias_x(wuffs_base__pixel_subsampling s,
+                                      uint32_t plane) {
+  uint32_t shift = ((plane & 0x03) * 8) + 6;
+  return (s >> shift) & 0x03;
+}
+
+static inline uint32_t  //
+wuffs_base__pixel_subsampling__denominator_x(wuffs_base__pixel_subsampling s,
+                                             uint32_t plane) {
+  uint32_t shift = ((plane & 0x03) * 8) + 4;
+  return ((s >> shift) & 0x03) + 1;
+}
+
+static inline uint32_t  //
+wuffs_base__pixel_subsampling__bias_y(wuffs_base__pixel_subsampling s,
+                                      uint32_t plane) {
+  uint32_t shift = ((plane & 0x03) * 8) + 2;
+  return (s >> shift) & 0x03;
+}
+
+static inline uint32_t  //
+wuffs_base__pixel_subsampling__denominator_y(wuffs_base__pixel_subsampling s,
+                                             uint32_t plane) {
+  uint32_t shift = ((plane & 0x03) * 8) + 0;
+  return ((s >> shift) & 0x03) + 1;
+}
+
+// --------
+
+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(wuffs_base__pixel_format pixfmt,
+                  wuffs_base__pixel_subsampling pixsub,
+                  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 = 0;
+  ret.private_impl.pixsub = 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,
+                              wuffs_base__pixel_format pixfmt,
+                              wuffs_base__pixel_subsampling pixsub,
+                              uint32_t width,
+                              uint32_t height) {
+  if (!c) {
+    return;
+  }
+  if (pixfmt) {
+    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 = pixfmt;
+      c->private_impl.pixsub = pixsub;
+      c->private_impl.width = width;
+      c->private_impl.height = height;
+      return;
+    }
+  }
+
+  c->private_impl.pixfmt = 0;
+  c->private_impl.pixsub = 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 = 0;
+    c->private_impl.pixsub = 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;
+}
+
+static inline wuffs_base__pixel_format  //
+wuffs_base__pixel_config__pixel_format(const wuffs_base__pixel_config* c) {
+  return c ? c->private_impl.pixfmt : 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 : 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(wuffs_base__pixel_format pixfmt,
+                              wuffs_base__pixel_subsampling pixsub,
+                              uint32_t width,
+                              uint32_t height) {
+  wuffs_base__pixel_config__set(this, pixfmt, pixsub, 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(wuffs_base__pixel_format pixfmt,
+                  wuffs_base__pixel_subsampling pixsub,
+                  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,
+                              wuffs_base__pixel_format pixfmt,
+                              wuffs_base__pixel_subsampling pixsub,
+                              uint32_t width,
+                              uint32_t height,
+                              uint64_t first_frame_io_position,
+                              bool first_frame_is_opaque) {
+  if (!c) {
+    return;
+  }
+  if (wuffs_base__pixel_format__is_valid(pixfmt)) {
+    c->pixcfg.private_impl.pixfmt = pixfmt;
+    c->pixcfg.private_impl.pixsub = pixsub;
+    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 = 0;
+  c->pixcfg.private_impl.pixsub = 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 = 0;
+    c->pixcfg.private_impl.pixsub = 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(wuffs_base__pixel_format pixfmt,
+                              wuffs_base__pixel_subsampling pixsub,
+                              uint32_t width,
+                              uint32_t height,
+                              uint64_t first_frame_io_position,
+                              bool first_frame_is_opaque) {
+  wuffs_base__image_config__set(this, pixfmt, pixsub, width, height,
+                                first_frame_io_position, first_frame_is_opaque);
+}
+
+inline void  //
+wuffs_base__image_config::invalidate() {
+  wuffs_base__image_config__invalidate(this);
+}
+
+inline bool  //
+wuffs_base__image_config::is_valid() const {
+  return wuffs_base__image_config__is_valid(this);
+}
+
+inline uint64_t  //
+wuffs_base__image_config::first_frame_io_position() const {
+  return wuffs_base__image_config__first_frame_io_position(this);
+}
+
+inline bool  //
+wuffs_base__image_config::first_frame_is_opaque() const {
+  return wuffs_base__image_config__first_frame_is_opaque(this);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+// wuffs_base__animation_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_blend blend;
+    wuffs_base__animation_disposal disposal;
+    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_blend blend,
+                     wuffs_base__animation_disposal disposal,
+                     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_blend blend() const;
+  inline wuffs_base__animation_disposal disposal() 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.blend = 0;
+  ret.private_impl.disposal = 0;
+  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_blend blend,
+    wuffs_base__animation_disposal disposal,
+    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.blend = blend;
+  c->private_impl.disposal = disposal;
+  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__blend returns, for an animated image, how to blend
+// the transparent pixels of this frame with the existing canvas.
+static inline wuffs_base__animation_blend  //
+wuffs_base__frame_config__blend(const wuffs_base__frame_config* c) {
+  return c ? c->private_impl.blend : 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;
+}
+
+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_blend blend,
+    wuffs_base__animation_disposal disposal,
+    wuffs_base__color_u32_argb_premul background_color) {
+  wuffs_base__frame_config__update(this, bounds, duration, index, io_position,
+                                   blend, disposal, 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_blend  //
+wuffs_base__frame_config::blend() const {
+  return wuffs_base__frame_config__blend(this);
+}
+
+inline wuffs_base__animation_disposal  //
+wuffs_base__frame_config::disposal() const {
+  return wuffs_base__frame_config__disposal(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);
+#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* b,
+                                         const wuffs_base__pixel_config* pixcfg,
+                                         wuffs_base__slice_u8 pixbuf_memory) {
+  if (!b) {
+    return wuffs_base__error__bad_receiver;
+  }
+  memset(b, 0, sizeof(*b));
+  if (!pixcfg) {
+    return 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__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__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__error__bad_argument_length_too_short;
+    }
+    wuffs_base__table_u8* tab =
+        &b->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__error__bad_argument;
+  }
+  wh *= bytes_per_pixel;
+  width *= bytes_per_pixel;
+  if (wh > len) {
+    return wuffs_base__error__bad_argument_length_too_short;
+  }
+
+  b->pixcfg = *pixcfg;
+  wuffs_base__table_u8* tab = &b->private_impl.planes[0];
+  tab->ptr = ptr;
+  tab->width = width;
+  tab->height = pixcfg->private_impl.height;
+  tab->stride = width;
+  return NULL;
+}
+
+static inline wuffs_base__status  //
+wuffs_base__pixel_buffer__set_from_table(wuffs_base__pixel_buffer* b,
+                                         const wuffs_base__pixel_config* pixcfg,
+                                         wuffs_base__table_u8 pixbuf_memory) {
+  if (!b) {
+    return wuffs_base__error__bad_receiver;
+  }
+  memset(b, 0, sizeof(*b));
+  if (!pixcfg ||
+      wuffs_base__pixel_format__is_planar(pixcfg->private_impl.pixfmt)) {
+    return 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__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__error__bad_argument;
+  }
+
+  b->pixcfg = *pixcfg;
+  b->private_impl.planes[0] = pixbuf_memory;
+  return 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* b) {
+  if (b &&
+      wuffs_base__pixel_format__is_indexed(b->pixcfg.private_impl.pixfmt)) {
+    wuffs_base__table_u8* tab =
+        &b->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* b) {
+  if (b) {
+    return b->pixcfg.private_impl.pixfmt;
+  }
+  return WUFFS_BASE__PIXEL_FORMAT__INVALID;
+}
+
+static inline wuffs_base__table_u8  //
+wuffs_base__pixel_buffer__plane(wuffs_base__pixel_buffer* b, uint32_t p) {
+  if (b && (p < WUFFS_BASE__PIXEL_FORMAT__NUM_PLANES_MAX)) {
+    return b->private_impl.planes[p];
+  }
+
+  wuffs_base__table_u8 ret;
+  ret.ptr = NULL;
+  ret.width = 0;
+  ret.height = 0;
+  ret.stride = 0;
+  return ret;
+}
+
+#ifdef __cplusplus
+
+inline wuffs_base__status  //
+wuffs_base__pixel_buffer::set_from_slice(const wuffs_base__pixel_config* pixcfg,
+                                         wuffs_base__slice_u8 pixbuf_memory) {
+  return wuffs_base__pixel_buffer__set_from_slice(this, pixcfg, pixbuf_memory);
+}
+
+inline wuffs_base__status  //
+wuffs_base__pixel_buffer::set_from_table(const wuffs_base__pixel_config* pixcfg,
+                                         wuffs_base__table_u8 pixbuf_memory) {
+  return wuffs_base__pixel_buffer__set_from_table(this, pixcfg, 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);
+}
+
+#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
+
+// --------
+
+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 {
+    // TODO: should the func type take restrict pointers?
+    uint64_t (*func)(wuffs_base__slice_u8 dst,
+                     wuffs_base__slice_u8 dst_palette,
+                     wuffs_base__slice_u8 src);
+  } private_impl;
+
+#ifdef __cplusplus
+  inline wuffs_base__status prepare(wuffs_base__pixel_format dst_format,
+                                    wuffs_base__slice_u8 dst_palette,
+                                    wuffs_base__pixel_format src_format,
+                                    wuffs_base__slice_u8 src_palette);
+  inline uint64_t swizzle_interleaved(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__status  //
+wuffs_base__pixel_swizzler__prepare(wuffs_base__pixel_swizzler* p,
+                                    wuffs_base__pixel_format dst_format,
+                                    wuffs_base__slice_u8 dst_palette,
+                                    wuffs_base__pixel_format src_format,
+                                    wuffs_base__slice_u8 src_palette);
+
+uint64_t  //
+wuffs_base__pixel_swizzler__swizzle_interleaved(
+    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_format,
+                                    wuffs_base__slice_u8 dst_palette,
+                                    wuffs_base__pixel_format src_format,
+                                    wuffs_base__slice_u8 src_palette) {
+  return wuffs_base__pixel_swizzler__prepare(this, dst_format, dst_palette,
+                                             src_format, src_palette);
+}
+
+uint64_t  //
+wuffs_base__pixel_swizzler::swizzle_interleaved(
+    wuffs_base__slice_u8 dst,
+    wuffs_base__slice_u8 dst_palette,
+    wuffs_base__slice_u8 src) const {
+  return wuffs_base__pixel_swizzler__swizzle_interleaved(this, dst, dst_palette,
+                                                         src);
+}
+
+#endif  // __cplusplus
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#ifdef __clang__
+#pragma clang diagnostic pop
+#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();
+
+// ---------------- Public Function Prototypes
+
+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 {
+#ifdef WUFFS_IMPLEMENTATION
+
+  // 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;
+
+    uint32_t f_state;
+    bool f_started;
+
+  } private_impl;
+
+#else  // WUFFS_IMPLEMENTATION
+
+  // When WUFFS_IMPLEMENTATION is not defined, this placeholder private_impl is
+  // large enough to discourage trying to allocate one on the stack. The sizeof
+  // the real private_impl (and the sizeof the real outermost wuffs_foo__bar
+  // struct) is not part of the public, stable, memory-safe API. Call
+  // wuffs_foo__bar__baz methods (which all take a "this"-like pointer as their
+  // first argument) instead of fiddling with bar.private_impl.qux fields.
+  //
+  // Even when WUFFS_IMPLEMENTATION is not defined, the outermost struct still
+  // defines C++ convenience methods. These methods forward on "this", so that
+  // you can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+ private:
+  union {
+    uint32_t align_as_per_magic_field;
+    uint8_t placeholder[1073741824];  // 1 GiB.
+  } private_impl WUFFS_BASE__POTENTIALLY_UNUSED_FIELD;
+
+ public:
+
+#endif  // WUFFS_IMPLEMENTATION
+
+#ifdef __cplusplus
+
+  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 uint32_t  //
+  update_u32(wuffs_base__slice_u8 a_x) {
+    return wuffs_adler32__hasher__update_u32(this, a_x);
+  }
+
+#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow copy and assign.
+  wuffs_adler32__hasher__struct(const wuffs_adler32__hasher__struct&) = delete;
+  wuffs_adler32__hasher__struct& operator=(
+      const wuffs_adler32__hasher__struct&) = delete;
+#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+
+#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
+
+// ---------------- 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();
+
+// ---------------- Public Function Prototypes
+
+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 {
+#ifdef WUFFS_IMPLEMENTATION
+
+  // 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;
+
+    uint32_t f_state;
+
+  } private_impl;
+
+#else  // WUFFS_IMPLEMENTATION
+
+  // When WUFFS_IMPLEMENTATION is not defined, this placeholder private_impl is
+  // large enough to discourage trying to allocate one on the stack. The sizeof
+  // the real private_impl (and the sizeof the real outermost wuffs_foo__bar
+  // struct) is not part of the public, stable, memory-safe API. Call
+  // wuffs_foo__bar__baz methods (which all take a "this"-like pointer as their
+  // first argument) instead of fiddling with bar.private_impl.qux fields.
+  //
+  // Even when WUFFS_IMPLEMENTATION is not defined, the outermost struct still
+  // defines C++ convenience methods. These methods forward on "this", so that
+  // you can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+ private:
+  union {
+    uint32_t align_as_per_magic_field;
+    uint8_t placeholder[1073741824];  // 1 GiB.
+  } private_impl WUFFS_BASE__POTENTIALLY_UNUSED_FIELD;
+
+ public:
+
+#endif  // WUFFS_IMPLEMENTATION
+
+#ifdef __cplusplus
+
+  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 uint32_t  //
+  update_u32(wuffs_base__slice_u8 a_x) {
+    return wuffs_crc32__ieee_hasher__update_u32(this, a_x);
+  }
+
+#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow copy and assign.
+  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;
+#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+
+#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();
+
+// ---------------- 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__range_ii_u64  //
+wuffs_deflate__decoder__workbuf_len(const wuffs_deflate__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_deflate__decoder__decode_io_writer(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 {
+#ifdef WUFFS_IMPLEMENTATION
+
+  // 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;
+
+    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_decode_io_writer[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[32768];
+    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;
+    } s_decode_huffman_slow[1];
+  } private_data;
+
+#else  // WUFFS_IMPLEMENTATION
+
+  // When WUFFS_IMPLEMENTATION is not defined, this placeholder private_impl is
+  // large enough to discourage trying to allocate one on the stack. The sizeof
+  // the real private_impl (and the sizeof the real outermost wuffs_foo__bar
+  // struct) is not part of the public, stable, memory-safe API. Call
+  // wuffs_foo__bar__baz methods (which all take a "this"-like pointer as their
+  // first argument) instead of fiddling with bar.private_impl.qux fields.
+  //
+  // Even when WUFFS_IMPLEMENTATION is not defined, the outermost struct still
+  // defines C++ convenience methods. These methods forward on "this", so that
+  // you can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+ private:
+  union {
+    uint32_t align_as_per_magic_field;
+    uint8_t placeholder[1073741824];  // 1 GiB.
+  } private_impl WUFFS_BASE__POTENTIALLY_UNUSED_FIELD;
+
+ public:
+
+#endif  // WUFFS_IMPLEMENTATION
+
+#ifdef __cplusplus
+
+  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__empty_struct  //
+  add_history(wuffs_base__slice_u8 a_hist) {
+    return wuffs_deflate__decoder__add_history(this, a_hist);
+  }
+
+  inline wuffs_base__range_ii_u64  //
+  workbuf_len() const {
+    return wuffs_deflate__decoder__workbuf_len(this);
+  }
+
+  inline wuffs_base__status  //
+  decode_io_writer(wuffs_base__io_buffer* a_dst,
+                   wuffs_base__io_buffer* a_src,
+                   wuffs_base__slice_u8 a_workbuf) {
+    return wuffs_deflate__decoder__decode_io_writer(this, a_dst, a_src,
+                                                    a_workbuf);
+  }
+
+#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow copy and assign.
+  wuffs_deflate__decoder__struct(const wuffs_deflate__decoder__struct&) =
+      delete;
+  wuffs_deflate__decoder__struct& operator=(
+      const wuffs_deflate__decoder__struct&) = delete;
+#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+
+#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();
+
+// ---------------- Public Function Prototypes
+
+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__decode_io_writer(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 {
+#ifdef WUFFS_IMPLEMENTATION
+
+  // 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;
+
+    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_decode_io_writer[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;
+
+#else  // WUFFS_IMPLEMENTATION
+
+  // When WUFFS_IMPLEMENTATION is not defined, this placeholder private_impl is
+  // large enough to discourage trying to allocate one on the stack. The sizeof
+  // the real private_impl (and the sizeof the real outermost wuffs_foo__bar
+  // struct) is not part of the public, stable, memory-safe API. Call
+  // wuffs_foo__bar__baz methods (which all take a "this"-like pointer as their
+  // first argument) instead of fiddling with bar.private_impl.qux fields.
+  //
+  // Even when WUFFS_IMPLEMENTATION is not defined, the outermost struct still
+  // defines C++ convenience methods. These methods forward on "this", so that
+  // you can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+ private:
+  union {
+    uint32_t align_as_per_magic_field;
+    uint8_t placeholder[1073741824];  // 1 GiB.
+  } private_impl WUFFS_BASE__POTENTIALLY_UNUSED_FIELD;
+
+ public:
+
+#endif  // WUFFS_IMPLEMENTATION
+
+#ifdef __cplusplus
+
+  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__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  //
+  decode_io_writer(wuffs_base__io_buffer* a_dst,
+                   wuffs_base__io_buffer* a_src,
+                   wuffs_base__slice_u8 a_workbuf) {
+    return wuffs_lzw__decoder__decode_io_writer(this, a_dst, a_src, a_workbuf);
+  }
+
+  inline wuffs_base__slice_u8  //
+  flush() {
+    return wuffs_lzw__decoder__flush(this);
+  }
+
+#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow copy and assign.
+  wuffs_lzw__decoder__struct(const wuffs_lzw__decoder__struct&) = delete;
+  wuffs_lzw__decoder__struct& operator=(const wuffs_lzw__decoder__struct&) =
+      delete;
+#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+
+#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_block;
+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 1
+
+#define WUFFS_GIF__QUIRK_DELAY_NUM_DECODED_FRAMES 1041635328
+
+#define WUFFS_GIF__QUIRK_FIRST_FRAME_LOCAL_PALETTE_MEANS_BLACK_BACKGROUND \
+  1041635329
+
+#define WUFFS_GIF__QUIRK_HONOR_BACKGROUND_COLOR 1041635330
+
+#define WUFFS_GIF__QUIRK_IGNORE_TOO_MUCH_PIXEL_DATA 1041635331
+
+#define WUFFS_GIF__QUIRK_IMAGE_BOUNDS_ARE_STRICT 1041635332
+
+#define WUFFS_GIF__QUIRK_REJECT_EMPTY_FRAME 1041635333
+
+#define WUFFS_GIF__QUIRK_REJECT_EMPTY_PALETTE 1041635334
+
+// ---------------- Struct Declarations
+
+typedef struct wuffs_gif__decoder__struct wuffs_gif__decoder;
+
+// ---------------- Public Initializer Prototypes
+
+// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
+// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
+//
+// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
+// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for initialize_flags.
+
+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();
+
+// ---------------- Public Function Prototypes
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
+wuffs_gif__decoder__set_quirk_enabled(wuffs_gif__decoder* self,
+                                      uint32_t a_quirk,
+                                      bool a_enabled);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_gif__decoder__decode_image_config(wuffs_gif__decoder* self,
+                                        wuffs_base__image_config* a_dst,
+                                        wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
+wuffs_gif__decoder__set_report_metadata(wuffs_gif__decoder* self,
+                                        uint32_t a_fourcc,
+                                        bool a_report);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_gif__decoder__ack_metadata_chunk(wuffs_gif__decoder* self,
+                                       wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC uint32_t  //
+wuffs_gif__decoder__metadata_fourcc(const wuffs_gif__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC uint64_t  //
+wuffs_gif__decoder__metadata_chunk_length(const wuffs_gif__decoder* self);
+
+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__slice_u8 a_workbuf,
+                                 wuffs_base__decode_frame_options* a_opts);
+
+// ---------------- Struct Definitions
+
+// These structs' fields, and the sizeof them, are private implementation
+// details that aren't guaranteed to be stable across Wuffs versions.
+//
+// See https://en.wikipedia.org/wiki/Opaque_pointer#C
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_gif__decoder__struct {
+#ifdef WUFFS_IMPLEMENTATION
+
+  // 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;
+
+    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_value;
+    uint64_t f_metadata_chunk_length_value;
+    uint64_t f_metadata_io_position;
+    bool f_quirk_enabled_delay_num_decoded_frames;
+    bool f_quirk_enabled_first_frame_local_palette_means_black_background;
+    bool f_quirk_enabled_honor_background_color;
+    bool f_quirk_enabled_ignore_too_much_pixel_data;
+    bool f_quirk_enabled_image_bounds_are_strict;
+    bool f_quirk_enabled_reject_empty_frame;
+    bool f_quirk_enabled_reject_empty_palette;
+    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_ack_metadata_chunk[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 {
+      uint8_t v_blend;
+      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;
+
+#else  // WUFFS_IMPLEMENTATION
+
+  // When WUFFS_IMPLEMENTATION is not defined, this placeholder private_impl is
+  // large enough to discourage trying to allocate one on the stack. The sizeof
+  // the real private_impl (and the sizeof the real outermost wuffs_foo__bar
+  // struct) is not part of the public, stable, memory-safe API. Call
+  // wuffs_foo__bar__baz methods (which all take a "this"-like pointer as their
+  // first argument) instead of fiddling with bar.private_impl.qux fields.
+  //
+  // Even when WUFFS_IMPLEMENTATION is not defined, the outermost struct still
+  // defines C++ convenience methods. These methods forward on "this", so that
+  // you can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+ private:
+  union {
+    uint32_t align_as_per_magic_field;
+    uint8_t placeholder[1073741824];  // 1 GiB.
+  } private_impl WUFFS_BASE__POTENTIALLY_UNUSED_FIELD;
+
+ public:
+
+#endif  // WUFFS_IMPLEMENTATION
+
+#ifdef __cplusplus
+
+  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__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  //
+  ack_metadata_chunk(wuffs_base__io_buffer* a_src) {
+    return wuffs_gif__decoder__ack_metadata_chunk(this, a_src);
+  }
+
+  inline uint32_t  //
+  metadata_fourcc() const {
+    return wuffs_gif__decoder__metadata_fourcc(this);
+  }
+
+  inline uint64_t  //
+  metadata_chunk_length() const {
+    return wuffs_gif__decoder__metadata_chunk_length(this);
+  }
+
+  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__slice_u8 a_workbuf,
+               wuffs_base__decode_frame_options* a_opts) {
+    return wuffs_gif__decoder__decode_frame(this, a_dst, a_src, a_workbuf,
+                                            a_opts);
+  }
+
+#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow copy and assign.
+  wuffs_gif__decoder__struct(const wuffs_gif__decoder__struct&) = delete;
+  wuffs_gif__decoder__struct& operator=(const wuffs_gif__decoder__struct&) =
+      delete;
+#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+
+#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();
+
+// ---------------- 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__range_ii_u64  //
+wuffs_gzip__decoder__workbuf_len(const wuffs_gzip__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_gzip__decoder__decode_io_writer(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 {
+#ifdef WUFFS_IMPLEMENTATION
+
+  // 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;
+
+    bool f_ignore_checksum;
+
+    uint32_t p_decode_io_writer[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_decode_io_writer[1];
+  } private_data;
+
+#else  // WUFFS_IMPLEMENTATION
+
+  // When WUFFS_IMPLEMENTATION is not defined, this placeholder private_impl is
+  // large enough to discourage trying to allocate one on the stack. The sizeof
+  // the real private_impl (and the sizeof the real outermost wuffs_foo__bar
+  // struct) is not part of the public, stable, memory-safe API. Call
+  // wuffs_foo__bar__baz methods (which all take a "this"-like pointer as their
+  // first argument) instead of fiddling with bar.private_impl.qux fields.
+  //
+  // Even when WUFFS_IMPLEMENTATION is not defined, the outermost struct still
+  // defines C++ convenience methods. These methods forward on "this", so that
+  // you can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+ private:
+  union {
+    uint32_t align_as_per_magic_field;
+    uint8_t placeholder[1073741824];  // 1 GiB.
+  } private_impl WUFFS_BASE__POTENTIALLY_UNUSED_FIELD;
+
+ public:
+
+#endif  // WUFFS_IMPLEMENTATION
+
+#ifdef __cplusplus
+
+  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__empty_struct  //
+  set_ignore_checksum(bool a_ic) {
+    return wuffs_gzip__decoder__set_ignore_checksum(this, a_ic);
+  }
+
+  inline wuffs_base__range_ii_u64  //
+  workbuf_len() const {
+    return wuffs_gzip__decoder__workbuf_len(this);
+  }
+
+  inline wuffs_base__status  //
+  decode_io_writer(wuffs_base__io_buffer* a_dst,
+                   wuffs_base__io_buffer* a_src,
+                   wuffs_base__slice_u8 a_workbuf) {
+    return wuffs_gzip__decoder__decode_io_writer(this, a_dst, a_src, a_workbuf);
+  }
+
+#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow copy and assign.
+  wuffs_gzip__decoder__struct(const wuffs_gzip__decoder__struct&) = delete;
+  wuffs_gzip__decoder__struct& operator=(const wuffs_gzip__decoder__struct&) =
+      delete;
+#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+
+#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_zlib__warning__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();
+
+// ---------------- 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__range_ii_u64  //
+wuffs_zlib__decoder__workbuf_len(const wuffs_zlib__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_zlib__decoder__decode_io_writer(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 {
+#ifdef WUFFS_IMPLEMENTATION
+
+  // 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;
+
+    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_decode_io_writer[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_decode_io_writer[1];
+  } private_data;
+
+#else  // WUFFS_IMPLEMENTATION
+
+  // When WUFFS_IMPLEMENTATION is not defined, this placeholder private_impl is
+  // large enough to discourage trying to allocate one on the stack. The sizeof
+  // the real private_impl (and the sizeof the real outermost wuffs_foo__bar
+  // struct) is not part of the public, stable, memory-safe API. Call
+  // wuffs_foo__bar__baz methods (which all take a "this"-like pointer as their
+  // first argument) instead of fiddling with bar.private_impl.qux fields.
+  //
+  // Even when WUFFS_IMPLEMENTATION is not defined, the outermost struct still
+  // defines C++ convenience methods. These methods forward on "this", so that
+  // you can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+ private:
+  union {
+    uint32_t align_as_per_magic_field;
+    uint8_t placeholder[1073741824];  // 1 GiB.
+  } private_impl WUFFS_BASE__POTENTIALLY_UNUSED_FIELD;
+
+ public:
+
+#endif  // WUFFS_IMPLEMENTATION
+
+#ifdef __cplusplus
+
+  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 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__range_ii_u64  //
+  workbuf_len() const {
+    return wuffs_zlib__decoder__workbuf_len(this);
+  }
+
+  inline wuffs_base__status  //
+  decode_io_writer(wuffs_base__io_buffer* a_dst,
+                   wuffs_base__io_buffer* a_src,
+                   wuffs_base__slice_u8 a_workbuf) {
+    return wuffs_zlib__decoder__decode_io_writer(this, a_dst, a_src, a_workbuf);
+  }
+
+#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow copy and assign.
+  wuffs_zlib__decoder__struct(const wuffs_zlib__decoder__struct&) = delete;
+  wuffs_zlib__decoder__struct& operator=(const wuffs_zlib__decoder__struct&) =
+      delete;
+#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+
+#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
+
+// GCC does not warn for unused *static inline* functions, but clang does.
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-function"
+#endif
+
+#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) {                                                \
+    goto ok;                                                    \
+  } else if (*status != '$') {                                  \
+    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
+
+// 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.
+
+// ---------------- Numeric Types
+
+static inline uint8_t  //
+wuffs_base__load_u8be(uint8_t* p) {
+  return p[0];
+}
+
+static inline uint16_t  //
+wuffs_base__load_u16be(uint8_t* p) {
+  return (uint16_t)(((uint16_t)(p[0]) << 8) | ((uint16_t)(p[1]) << 0));
+}
+
+static inline uint16_t  //
+wuffs_base__load_u16le(uint8_t* p) {
+  return (uint16_t)(((uint16_t)(p[0]) << 0) | ((uint16_t)(p[1]) << 8));
+}
+
+static inline uint32_t  //
+wuffs_base__load_u24be(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(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(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(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(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(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(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(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(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(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(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(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);
+}
+
+// --------
+
+static inline void  //
+wuffs_base__store_u8be(uint8_t* p, uint8_t x) {
+  p[0] = x;
+}
+
+static inline void  //
+wuffs_base__store_u16be(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(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(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(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(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(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(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(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(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(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(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(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(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(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);
+}
+
+// --------
+
+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__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_writer__copy_n_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
+  // copy_n_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__copy_n_from_history_fast below.
+  //
+  // Alternatively, or additionally, have a sloppy_copy_n_from_history method
+  // that copies 8 bytes at a time, possibly writing 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__copy_n_from_history_fast is like the
+// wuffs_base__io_writer__copy_n_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__copy_n_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__copy_n_from_reader(uint8_t** ptr_iop_w,
+                                          uint8_t* io2_w,
+                                          uint32_t length,
+                                          uint8_t** ptr_iop_r,
+                                          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);
+  }
+  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 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__copy_n_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_reader__set(wuffs_base__io_buffer* b,
+                           uint8_t** ptr_iop_r,
+                           uint8_t** ptr_io0_r,
+                           uint8_t** ptr_io1_r,
+                           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 wuffs_base__slice_u8  //
+wuffs_base__io_reader__take(uint8_t** ptr_iop_r, uint8_t* io2_r, uint64_t n) {
+  if (n <= ((size_t)(io2_r - *ptr_iop_r))) {
+    uint8_t* p = *ptr_iop_r;
+    *ptr_iop_r += n;
+    return wuffs_base__make_slice_u8(p, n);
+  }
+  return wuffs_base__make_slice_u8(NULL, 0);
+}
+
+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
+
+  // ---------------- Memory Allocation
+
+  // ---------------- Images
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BASE)
+
+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 char* wuffs_base__warning__end_of_data = "@base: end of data";
+const char* wuffs_base__warning__metadata_reported = "@base: metadata reported";
+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_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__not_enough_data = "#base: not enough data";
+const char* wuffs_base__error__unsupported_option = "#base: unsupported option";
+const char* wuffs_base__error__too_much_data = "#base: too much data";
+
+// ---------------- Images
+
+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,
+};
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__copy_1_1(wuffs_base__slice_u8 dst,
+                                     wuffs_base__slice_u8 dst_palette,
+                                     wuffs_base__slice_u8 src) {
+  return wuffs_base__slice_u8__copy_from_slice(dst, src);
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__copy_3_1(wuffs_base__slice_u8 dst,
+                                     wuffs_base__slice_u8 dst_palette,
+                                     wuffs_base__slice_u8 src) {
+  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;
+  uint8_t* s = src.ptr;
+  size_t n = len;
+
+  // N is the loop unroll count.
+  const int N = 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 > N) {
+    wuffs_base__store_u32le(
+        d + (0 * 3),
+        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[0]) * 4)));
+    wuffs_base__store_u32le(
+        d + (1 * 3),
+        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[1]) * 4)));
+    wuffs_base__store_u32le(
+        d + (2 * 3),
+        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[2]) * 4)));
+    wuffs_base__store_u32le(
+        d + (3 * 3),
+        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[3]) * 4)));
+
+    s += 1 * N;
+    d += 3 * N;
+    n -= (size_t)(1 * N);
+  }
+
+  while (n >= 1) {
+    uint32_t color =
+        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[0]) * 4));
+    d[0] = (uint8_t)(color >> 0);
+    d[1] = (uint8_t)(color >> 8);
+    d[2] = (uint8_t)(color >> 16);
+
+    s += 1 * 1;
+    d += 3 * 1;
+    n -= (size_t)(1 * 1);
+  }
+
+  return len;
+}
+static uint64_t  //
+wuffs_base__pixel_swizzler__copy_4_1(wuffs_base__slice_u8 dst,
+                                     wuffs_base__slice_u8 dst_palette,
+                                     wuffs_base__slice_u8 src) {
+  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;
+  uint8_t* s = src.ptr;
+  size_t n = len;
+
+  // N is the loop unroll count.
+  const int N = 4;
+
+  while (n >= N) {
+    wuffs_base__store_u32le(
+        d + (0 * 4),
+        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[0]) * 4)));
+    wuffs_base__store_u32le(
+        d + (1 * 4),
+        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[1]) * 4)));
+    wuffs_base__store_u32le(
+        d + (2 * 4),
+        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[2]) * 4)));
+    wuffs_base__store_u32le(
+        d + (3 * 4),
+        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[3]) * 4)));
+
+    s += 1 * N;
+    d += 4 * N;
+    n -= (size_t)(1 * N);
+  }
+
+  while (n >= 1) {
+    wuffs_base__store_u32le(
+        d + (0 * 4),
+        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[0]) * 4)));
+
+    s += 1 * 1;
+    d += 4 * 1;
+    n -= (size_t)(1 * 1);
+  }
+
+  return len;
+}
+
+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;
+  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;
+}
+
+wuffs_base__status  //
+wuffs_base__pixel_swizzler__prepare(wuffs_base__pixel_swizzler* p,
+                                    wuffs_base__pixel_format dst_format,
+                                    wuffs_base__slice_u8 dst_palette,
+                                    wuffs_base__pixel_format src_format,
+                                    wuffs_base__slice_u8 src_palette) {
+  if (!p) {
+    return wuffs_base__error__bad_receiver;
+  }
+
+  // TODO: support many more formats.
+
+  uint64_t (*func)(wuffs_base__slice_u8 dst, wuffs_base__slice_u8 dst_palette,
+                   wuffs_base__slice_u8 src) = NULL;
+
+  switch (src_format) {
+    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY:
+      switch (dst_format) {
+        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) {
+            break;
+          }
+          func = wuffs_base__pixel_swizzler__copy_1_1;
+          break;
+        case WUFFS_BASE__PIXEL_FORMAT__BGR:
+          if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
+              1024) {
+            break;
+          }
+          func = wuffs_base__pixel_swizzler__copy_3_1;
+          break;
+        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) {
+            break;
+          }
+          func = wuffs_base__pixel_swizzler__copy_4_1;
+          break;
+        case WUFFS_BASE__PIXEL_FORMAT__RGB:
+          if (wuffs_base__pixel_swizzler__swap_rgbx_bgrx(dst_palette,
+                                                         src_palette) != 1024) {
+            break;
+          }
+          func = wuffs_base__pixel_swizzler__copy_3_1;
+          break;
+        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) {
+            break;
+          }
+          func = wuffs_base__pixel_swizzler__copy_4_1;
+          break;
+        default:
+          break;
+      }
+      break;
+
+    default:
+      break;
+  }
+
+  p->private_impl.func = func;
+  return func ? NULL : wuffs_base__error__unsupported_option;
+}
+
+uint64_t  //
+wuffs_base__pixel_swizzler__swizzle_interleaved(
+    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, dst_palette, src);
+  }
+  return 0;
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) ||
+        // defined(WUFFS_CONFIG__MODULE__BASE)
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__ADLER32)
+
+// ---------------- Status Codes Implementations
+
+// ---------------- Private Consts
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+// ---------------- 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__error__bad_receiver;
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__error__bad_sizeof_receiver;
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return 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__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;
+  return NULL;
+}
+
+size_t  //
+sizeof__wuffs_adler32__hasher() {
+  return sizeof(wuffs_adler32__hasher);
+}
+
+// ---------------- Function Implementations
+
+// -------- 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__CRC32)
+
+// ---------------- Status Codes Implementations
+
+// ---------------- Private Consts
+
+static const uint32_t                 //
+    wuffs_crc32__ieee_table[16][256]  //
+    WUFFS_BASE__POTENTIALLY_UNUSED = {
+        {
+            0,          1996959894, 3993919788, 2567524794, 124634137,
+            1886057615, 3915621685, 2657392035, 249268274,  2044508324,
+            3772115230, 2547177864, 162941995,  2125561021, 3887607047,
+            2428444049, 498536548,  1789927666, 4089016648, 2227061214,
+            450548861,  1843258603, 4107580753, 2211677639, 325883990,
+            1684777152, 4251122042, 2321926636, 335633487,  1661365465,
+            4195302755, 2366115317, 997073096,  1281953886, 3579855332,
+            2724688242, 1006888145, 1258607687, 3524101629, 2768942443,
+            901097722,  1119000684, 3686517206, 2898065728, 853044451,
+            1172266101, 3705015759, 2882616665, 651767980,  1373503546,
+            3369554304, 3218104598, 565507253,  1454621731, 3485111705,
+            3099436303, 671266974,  1594198024, 3322730930, 2970347812,
+            795835527,  1483230225, 3244367275, 3060149565, 1994146192,
+            31158534,   2563907772, 4023717930, 1907459465, 112637215,
+            2680153253, 3904427059, 2013776290, 251722036,  2517215374,
+            3775830040, 2137656763, 141376813,  2439277719, 3865271297,
+            1802195444, 476864866,  2238001368, 4066508878, 1812370925,
+            453092731,  2181625025, 4111451223, 1706088902, 314042704,
+            2344532202, 4240017532, 1658658271, 366619977,  2362670323,
+            4224994405, 1303535960, 984961486,  2747007092, 3569037538,
+            1256170817, 1037604311, 2765210733, 3554079995, 1131014506,
+            879679996,  2909243462, 3663771856, 1141124467, 855842277,
+            2852801631, 3708648649, 1342533948, 654459306,  3188396048,
+            3373015174, 1466479909, 544179635,  3110523913, 3462522015,
+            1591671054, 702138776,  2966460450, 3352799412, 1504918807,
+            783551873,  3082640443, 3233442989, 3988292384, 2596254646,
+            62317068,   1957810842, 3939845945, 2647816111, 81470997,
+            1943803523, 3814918930, 2489596804, 225274430,  2053790376,
+            3826175755, 2466906013, 167816743,  2097651377, 4027552580,
+            2265490386, 503444072,  1762050814, 4150417245, 2154129355,
+            426522225,  1852507879, 4275313526, 2312317920, 282753626,
+            1742555852, 4189708143, 2394877945, 397917763,  1622183637,
+            3604390888, 2714866558, 953729732,  1340076626, 3518719985,
+            2797360999, 1068828381, 1219638859, 3624741850, 2936675148,
+            906185462,  1090812512, 3747672003, 2825379669, 829329135,
+            1181335161, 3412177804, 3160834842, 628085408,  1382605366,
+            3423369109, 3138078467, 570562233,  1426400815, 3317316542,
+            2998733608, 733239954,  1555261956, 3268935591, 3050360625,
+            752459403,  1541320221, 2607071920, 3965973030, 1969922972,
+            40735498,   2617837225, 3943577151, 1913087877, 83908371,
+            2512341634, 3803740692, 2075208622, 213261112,  2463272603,
+            3855990285, 2094854071, 198958881,  2262029012, 4057260610,
+            1759359992, 534414190,  2176718541, 4139329115, 1873836001,
+            414664567,  2282248934, 4279200368, 1711684554, 285281116,
+            2405801727, 4167216745, 1634467795, 376229701,  2685067896,
+            3608007406, 1308918612, 956543938,  2808555105, 3495958263,
+            1231636301, 1047427035, 2932959818, 3654703836, 1088359270,
+            936918000,  2847714899, 3736837829, 1202900863, 817233897,
+            3183342108, 3401237130, 1404277552, 615818150,  3134207493,
+            3453421203, 1423857449, 601450431,  3009837614, 3294710456,
+            1567103746, 711928724,  3020668471, 3272380065, 1510334235,
+            755167117,
+        },
+        {
+            0,          421212481,  842424962,  724390851,  1684849924,
+            2105013317, 1448781702, 1329698503, 3369699848, 3519200073,
+            4210026634, 3824474571, 2897563404, 3048111693, 2659397006,
+            2274893007, 1254232657, 1406739216, 2029285587, 1643069842,
+            783210325,  934667796,  479770071,  92505238,   2182846553,
+            2600511768, 2955803355, 2838940570, 3866582365, 4285295644,
+            3561045983, 3445231262, 2508465314, 2359236067, 2813478432,
+            3198777185, 4058571174, 3908292839, 3286139684, 3670389349,
+            1566420650, 1145479147, 1869335592, 1987116393, 959540142,
+            539646703,  185010476,  303839341,  3745920755, 3327985586,
+            3983561841, 4100678960, 3140154359, 2721170102, 2300350837,
+            2416418868, 396344571,  243568058,  631889529,  1018359608,
+            1945336319, 1793607870, 1103436669, 1490954812, 4034481925,
+            3915546180, 3259968903, 3679722694, 2484439553, 2366552896,
+            2787371139, 3208174018, 950060301,  565965900,  177645455,
+            328046286,  1556873225, 1171730760, 1861902987, 2011255754,
+            3132841300, 2745199637, 2290958294, 2442530455, 3738671184,
+            3352078609, 3974232786, 4126854035, 1919080284, 1803150877,
+            1079293406, 1498383519, 370020952,  253043481,  607678682,
+            1025720731, 1711106983, 2095471334, 1472923941, 1322268772,
+            26324643,   411738082,  866634785,  717028704,  2904875439,
+            3024081134, 2668790573, 2248782444, 3376948395, 3495106026,
+            4219356713, 3798300520, 792689142,  908347575,  487136116,
+            68299317,   1263779058, 1380486579, 2036719216, 1618931505,
+            3890672638, 4278043327, 3587215740, 3435896893, 2206873338,
+            2593195963, 2981909624, 2829542713, 998479947,  580430090,
+            162921161,  279890824,  1609522511, 1190423566, 1842954189,
+            1958874764, 4082766403, 3930137346, 3245109441, 3631694208,
+            2536953671, 2385372678, 2768287173, 3155920004, 1900120602,
+            1750776667, 1131931800, 1517083097, 355290910,  204897887,
+            656092572,  1040194781, 3113746450, 2692952403, 2343461520,
+            2461357009, 3723805974, 3304059991, 4022511508, 4141455061,
+            2919742697, 3072101800, 2620513899, 2234183466, 3396041197,
+            3547351212, 4166851439, 3779471918, 1725839073, 2143618976,
+            1424512099, 1307796770, 45282277,   464110244,  813994343,
+            698327078,  3838160568, 4259225593, 3606301754, 3488152955,
+            2158586812, 2578602749, 2996767038, 2877569151, 740041904,
+            889656817,  506086962,  120682355,  1215357364, 1366020341,
+            2051441462, 1667084919, 3422213966, 3538019855, 4190942668,
+            3772220557, 2945847882, 3062702859, 2644537544, 2226864521,
+            52649286,   439905287,  823476164,  672009861,  1733269570,
+            2119477507, 1434057408, 1281543041, 2167981343, 2552493150,
+            3004082077, 2853541596, 3847487515, 4233048410, 3613549209,
+            3464057816, 1239502615, 1358593622, 2077699477, 1657543892,
+            764250643,  882293586,  532408465,  111204816,  1585378284,
+            1197851309, 1816695150, 1968414767, 974272232,  587794345,
+            136598634,  289367339,  2527558116, 2411481253, 2760973158,
+            3179948583, 4073438432, 3956313505, 3237863010, 3655790371,
+            347922877,  229101820,  646611775,  1066513022, 1892689081,
+            1774917112, 1122387515, 1543337850, 3697634229, 3313392372,
+            3998419255, 4148705398, 3087642289, 2702352368, 2319436851,
+            2468674930,
+        },
+        {
+            0,          29518391,   59036782,   38190681,   118073564,
+            114017003,  76381362,   89069189,   236147128,  265370511,
+            228034006,  206958561,  152762724,  148411219,  178138378,
+            190596925,  472294256,  501532999,  530741022,  509615401,
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+            1065936977,
+        },
+        {
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+            475261322,
+        },
+        {
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+            908921239,  2554697734, 380632892,  3100077741, 2433735263,
+            1063734222, 3265180603, 1828069930, 1161729752, 3948283721,
+            2207997677, 770953084,  71007118,   2857626143, 1470763626,
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+            1999168705, 3644880208, 616140069,  2328960180, 2736367686,
+            225524183,
+        },
+};
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+// ---------------- 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__error__bad_receiver;
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__error__bad_sizeof_receiver;
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return 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__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;
+  return NULL;
+}
+
+size_t  //
+sizeof__wuffs_crc32__ieee_hasher() {
+  return sizeof(wuffs_crc32__ieee_hasher);
+}
+
+// ---------------- Function Implementations
+
+// -------- 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);
+
+// ---------------- 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__error__bad_receiver;
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__error__bad_sizeof_receiver;
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return 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__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;
+  return NULL;
+}
+
+size_t  //
+sizeof__wuffs_deflate__decoder() {
+  return sizeof(wuffs_deflate__decoder);
+}
+
+// ---------------- Function Implementations
+
+// -------- func deflate.decoder.add_history
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
+wuffs_deflate__decoder__add_history(wuffs_deflate__decoder* self,
+                                    wuffs_base__slice_u8 a_hist) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+
+  wuffs_base__slice_u8 v_s = {0};
+  uint64_t v_n_copied = 0;
+  uint32_t v_already_full = 0;
+
+  v_s = a_hist;
+  if (((uint64_t)(v_s.len)) >= 32768) {
+    v_s = wuffs_base__slice_u8__suffix(v_s, 32768);
+    wuffs_base__slice_u8__copy_from_slice(
+        wuffs_base__make_slice_u8(self->private_data.f_history, 32768), v_s);
+    self->private_impl.f_history_index = 32768;
+  } else {
+    v_n_copied = wuffs_base__slice_u8__copy_from_slice(
+        wuffs_base__slice_u8__subslice_i(
+            wuffs_base__make_slice_u8(self->private_data.f_history, 32768),
+            (self->private_impl.f_history_index & 32767)),
+        v_s);
+    if (v_n_copied < ((uint64_t)(v_s.len))) {
+      v_s = wuffs_base__slice_u8__subslice_i(v_s, v_n_copied);
+      v_n_copied = wuffs_base__slice_u8__copy_from_slice(
+          wuffs_base__make_slice_u8(self->private_data.f_history, 32768), v_s);
+      self->private_impl.f_history_index =
+          (((uint32_t)((v_n_copied & 32767))) + 32768);
+    } else {
+      v_already_full = 0;
+      if (self->private_impl.f_history_index >= 32768) {
+        v_already_full = 32768;
+      }
+      self->private_impl.f_history_index =
+          ((self->private_impl.f_history_index & 32767) +
+           ((uint32_t)((v_n_copied & 32767))) + v_already_full);
+    }
+  }
+  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__make_range_ii_u64(0, 0);
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__make_range_ii_u64(0, 0);
+  }
+
+  return wuffs_base__utility__make_range_ii_u64(1, 1);
+}
+
+// -------- func deflate.decoder.decode_io_writer
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_deflate__decoder__decode_io_writer(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__error__bad_receiver;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return (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__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__error__interleaved_coroutine_calls;
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = NULL;
+
+  uint64_t v_mark = 0;
+  wuffs_base__status v_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_decode_io_writer[0];
+  if (coro_susp_point) {
+  }
+  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__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_decode_io_writer[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_io_writer[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 = NULL;
+
+  uint32_t v_final = 0;
+  uint32_t v_b0 = 0;
+  uint32_t v_type = 0;
+  wuffs_base__status v_status = NULL;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  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_0_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__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) {
+          goto suspend;
+        }
+        goto label_0_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__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) {
+          goto suspend;
+        }
+      } else {
+        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_0_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) {
+          goto suspend;
+        }
+        if (self->private_impl.f_end_of_block) {
+          goto label_0_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 = 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;
+    }
+  }
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  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_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(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__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_deflate__error__inconsistent_stored_block_length;
+      goto exit;
+    }
+    v_length = ((v_length)&0xFFFF);
+    while (true) {
+      v_n_copied = wuffs_base__io_writer__copy_n_from_reader(
+          &iop_a_dst, io2_a_dst, v_length, &iop_a_src, io2_a_src);
+      if (v_length <= v_n_copied) {
+        status = NULL;
+        goto ok;
+      }
+      v_length -= v_n_copied;
+      if (((uint64_t)(io2_a_dst - iop_a_dst)) == 0) {
+        status = wuffs_base__suspension__short_write;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(3);
+      } else {
+        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 = 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 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 = 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 = 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;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  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__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_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_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__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__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_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_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_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__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_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_deflate__error__bad_huffman_code_length_count;
+      goto exit;
+    }
+    if (self->private_data.f_code_lengths[256] == 0) {
+      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_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_deflate__error__no_huffman_codes;
+  }
+  v_remaining = 1;
+  v_i = 1;
+  while (v_i <= 15) {
+    if (v_remaining > 1073741824) {
+      return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+    }
+    v_remaining <<= 1;
+    if (v_remaining < ((uint32_t)(v_counts[v_i]))) {
+      return 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 NULL;
+    }
+    return 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_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_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_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_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_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_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_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+  }
+  if ((a_n_codes0 + ((uint32_t)(v_symbols[0]))) >= 320) {
+    return 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_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_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_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_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_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_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_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_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_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+    }
+  }
+label_3_break:;
+  return 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 = 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_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;
+    }
+  }
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  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_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_0_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(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(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(iop_a_dst,
+                              ((uint8_t)(((v_table_entry >> 8) & 255)))),
+       iop_a_dst += 1, wuffs_base__make_empty_struct());
+      goto label_0_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_0_break;
+    } else if ((v_table_entry >> 28) != 0) {
+      if (v_n_bits < 15) {
+        v_bits |= (((uint32_t)(wuffs_base__load_u8be(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(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(iop_a_dst,
+                                ((uint8_t)(((v_table_entry >> 8) & 255)))),
+         iop_a_dst += 1, wuffs_base__make_empty_struct());
+        goto label_0_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_0_break;
+      } else if ((v_table_entry >> 28) != 0) {
+        status =
+            wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+        goto exit;
+      } else if ((v_table_entry >> 27) != 0) {
+        status = wuffs_deflate__error__bad_huffman_code;
+        goto exit;
+      } else {
+        status =
+            wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+        goto exit;
+      }
+    } else if ((v_table_entry >> 27) != 0) {
+      status = wuffs_deflate__error__bad_huffman_code;
+      goto exit;
+    } else {
+      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(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(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(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(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(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(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_deflate__error__bad_huffman_code;
+        goto exit;
+      }
+      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(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(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;
+    v_n_copied = 0;
+    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_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__copy_n_from_slice(
+              &iop_a_dst, io2_a_dst, v_hlen,
+              wuffs_base__slice_u8__subslice_i(
+                  wuffs_base__make_slice_u8(self->private_data.f_history,
+                                            32768),
+                  (v_hdist & 32767)));
+          if (v_hlen <= v_n_copied) {
+            goto label_1_break;
+          }
+          v_hlen -= v_n_copied;
+          wuffs_base__io_writer__copy_n_from_slice(
+              &iop_a_dst, io2_a_dst, v_hlen,
+              wuffs_base__make_slice_u8(self->private_data.f_history, 32768));
+          goto label_1_break;
+        }
+      label_1_break:;
+        if (v_length == 0) {
+          goto label_0_continue;
+        }
+        if (((uint64_t)((v_dist_minus_1 + 1))) >
+            ((uint64_t)(iop_a_dst - io0_a_dst))) {
+          status = wuffs_deflate__error__internal_error_inconsistent_distance;
+          goto exit;
+        }
+      }
+      wuffs_base__io_writer__copy_n_from_history_fast(
+          &iop_a_dst, io0_a_dst, io2_a_dst, v_length, (v_dist_minus_1 + 1));
+      goto label_2_break;
+    }
+  label_2_break:;
+  }
+label_0_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_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_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 = 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;
+    }
+  }
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  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_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_0_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_1_break;
+        }
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            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_1_break:;
+      if ((v_table_entry >> 31) != 0) {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+        if (iop_a_dst == io2_a_dst) {
+          status = wuffs_base__suspension__short_write;
+          goto suspend;
+        }
+        *iop_a_dst++ = ((uint8_t)(((v_table_entry >> 8) & 255)));
+        goto label_0_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_0_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_2_break;
+          }
+          {
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              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_2_break:;
+        if ((v_table_entry >> 31) != 0) {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+          if (iop_a_dst == io2_a_dst) {
+            status = wuffs_base__suspension__short_write;
+            goto suspend;
+          }
+          *iop_a_dst++ = ((uint8_t)(((v_table_entry >> 8) & 255)));
+          goto label_0_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_0_break;
+        } else if ((v_table_entry >> 28) != 0) {
+          status =
+              wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+          goto exit;
+        } else if ((v_table_entry >> 27) != 0) {
+          status = wuffs_deflate__error__bad_huffman_code;
+          goto exit;
+        } else {
+          status =
+              wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+          goto exit;
+        }
+      } else if ((v_table_entry >> 27) != 0) {
+        status = wuffs_deflate__error__bad_huffman_code;
+        goto exit;
+      } else {
+        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__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_3_break;
+        }
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            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_3_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_4_break;
+          }
+          {
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              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_4_break:;
+      }
+      if ((v_table_entry >> 24) != 64) {
+        if ((v_table_entry >> 24) == 8) {
+          status = wuffs_deflate__error__bad_huffman_code;
+          goto exit;
+        }
+        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__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_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__copy_n_from_slice(
+                &iop_a_dst, io2_a_dst, v_hlen,
+                wuffs_base__slice_u8__subslice_i(
+                    wuffs_base__make_slice_u8(self->private_data.f_history,
+                                              32768),
+                    (v_hdist & 32767)));
+            if (v_hlen <= v_n_copied) {
+              v_hlen = 0;
+              goto label_5_break;
+            }
+            if (v_n_copied > 0) {
+              v_hlen -= v_n_copied;
+              v_hdist = ((v_hdist + v_n_copied) & 32767);
+              if (v_hdist == 0) {
+                goto label_5_break;
+              }
+            }
+            status = wuffs_base__suspension__short_write;
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(9);
+          }
+        label_5_break:;
+          if (v_hlen > 0) {
+            while (true) {
+              v_n_copied = wuffs_base__io_writer__copy_n_from_slice(
+                  &iop_a_dst, io2_a_dst, v_hlen,
+                  wuffs_base__slice_u8__subslice_i(
+                      wuffs_base__make_slice_u8(self->private_data.f_history,
+                                                32768),
+                      (v_hdist & 32767)));
+              if (v_hlen <= v_n_copied) {
+                v_hlen = 0;
+                goto label_6_break;
+              }
+              v_hlen -= v_n_copied;
+              v_hdist += v_n_copied;
+              status = wuffs_base__suspension__short_write;
+              WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(10);
+            }
+          label_6_break:;
+          }
+          if (v_length == 0) {
+            goto label_0_continue;
+          }
+        }
+        v_n_copied = wuffs_base__io_writer__copy_n_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_7_break;
+        }
+        v_length -= v_n_copied;
+        status = wuffs_base__suspension__short_write;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(11);
+      }
+    label_7_break:;
+    }
+  label_0_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_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);
+
+// ---------------- 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__error__bad_receiver;
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__error__bad_sizeof_receiver;
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return 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__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;
+  return NULL;
+}
+
+size_t  //
+sizeof__wuffs_lzw__decoder() {
+  return sizeof(wuffs_lzw__decoder);
+}
+
+// ---------------- Function Implementations
+
+// -------- 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__make_range_ii_u64(0, 0);
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__make_range_ii_u64(0, 0);
+  }
+
+  return wuffs_base__utility__make_range_ii_u64(0, 0);
+}
+
+// -------- func lzw.decoder.decode_io_writer
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_lzw__decoder__decode_io_writer(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__error__bad_receiver;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return (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__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__error__interleaved_coroutine_calls;
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = NULL;
+
+  uint32_t v_i = 0;
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_io_writer[0];
+  if (coro_susp_point) {
+  }
+  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) {
+          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__suspension__short_read;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
+      } else if (self->private_impl.f_read_from_return_value == 3) {
+        status = wuffs_lzw__error__bad_code;
+        goto exit;
+      } else {
+        status = wuffs_lzw__error__internal_error_inconsistent_i_o;
+        goto exit;
+      }
+    }
+  label_0_break:;
+
+    goto ok;
+  ok:
+    self->private_impl.p_decode_io_writer[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_io_writer[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;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  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(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(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(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 = 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];
+  if (coro_susp_point) {
+  }
+  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_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 = NULL;
+        goto ok;
+      }
+      self->private_impl.f_output_ri =
+          ((self->private_impl.f_output_ri + ((uint32_t)((v_n & 4294967295)))) &
+           8191);
+      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_block = "#gif: bad block";
+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,
+};
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+static wuffs_base__status  //
+wuffs_gif__decoder__skip_frame(wuffs_gif__decoder* self,
+                               wuffs_base__io_buffer* a_src);
+
+static wuffs_base__empty_struct  //
+wuffs_gif__decoder__reset_gc(wuffs_gif__decoder* self);
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_up_to_id_part1(wuffs_gif__decoder* self,
+                                          wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_header(wuffs_gif__decoder* self,
+                                  wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_lsd(wuffs_gif__decoder* self,
+                               wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_extension(wuffs_gif__decoder* self,
+                                     wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status  //
+wuffs_gif__decoder__skip_blocks(wuffs_gif__decoder* self,
+                                wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_ae(wuffs_gif__decoder* self,
+                              wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_gc(wuffs_gif__decoder* self,
+                              wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_id_part0(wuffs_gif__decoder* self,
+                                    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_id_part1(wuffs_gif__decoder* self,
+                                    wuffs_base__pixel_buffer* a_dst,
+                                    wuffs_base__io_buffer* a_src);
+
+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);
+
+// ---------------- Initializer Implementations
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
+wuffs_gif__decoder__initialize(wuffs_gif__decoder* self,
+                               size_t sizeof_star_self,
+                               uint64_t wuffs_version,
+                               uint32_t initialize_flags) {
+  if (!self) {
+    return wuffs_base__error__bad_receiver;
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__error__bad_sizeof_receiver;
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return 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__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) {
+      return z;
+    }
+  }
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  return NULL;
+}
+
+size_t  //
+sizeof__wuffs_gif__decoder() {
+  return sizeof(wuffs_gif__decoder);
+}
+
+// ---------------- Function Implementations
+
+// -------- func gif.decoder.set_quirk_enabled
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
+wuffs_gif__decoder__set_quirk_enabled(wuffs_gif__decoder* self,
+                                      uint32_t a_quirk,
+                                      bool a_enabled) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+
+  if (self->private_impl.f_call_sequence == 0) {
+    if (a_quirk == 1041635328) {
+      self->private_impl.f_quirk_enabled_delay_num_decoded_frames = a_enabled;
+    } else if (a_quirk == 1041635329) {
+      self->private_impl
+          .f_quirk_enabled_first_frame_local_palette_means_black_background =
+          a_enabled;
+    } else if (a_quirk == 1041635330) {
+      self->private_impl.f_quirk_enabled_honor_background_color = a_enabled;
+    } else if (a_quirk == 1041635331) {
+      self->private_impl.f_quirk_enabled_ignore_too_much_pixel_data = a_enabled;
+    } else if (a_quirk == 1041635332) {
+      self->private_impl.f_quirk_enabled_image_bounds_are_strict = a_enabled;
+    } else if (a_quirk == 1041635333) {
+      self->private_impl.f_quirk_enabled_reject_empty_frame = a_enabled;
+    } else if (a_quirk == 1041635334) {
+      self->private_impl.f_quirk_enabled_reject_empty_palette = 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__error__bad_receiver;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return (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__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__error__interleaved_coroutine_calls;
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = NULL;
+
+  bool v_ffio = false;
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_image_config[0];
+  if (coro_susp_point) {
+  }
+  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) {
+        goto suspend;
+      }
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+      status = wuffs_gif__decoder__decode_lsd(self, a_src);
+      if (status) {
+        goto suspend;
+      }
+    } else if (self->private_impl.f_call_sequence != 2) {
+      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) {
+      goto suspend;
+    }
+    v_ffio = !self->private_impl.f_gc_has_transparent_index;
+    if (!self->private_impl.f_quirk_enabled_honor_background_color) {
+      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, 1191444488, 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.ack_metadata_chunk
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_gif__decoder__ack_metadata_chunk(wuffs_gif__decoder* self,
+                                       wuffs_base__io_buffer* a_src) {
+  if (!self) {
+    return wuffs_base__error__bad_receiver;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return (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__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__error__interleaved_coroutine_calls;
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = NULL;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  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_ack_metadata_chunk[0];
+  if (coro_susp_point) {
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_call_sequence != 1) {
+      status = wuffs_base__error__bad_call_sequence;
+      goto exit;
+    }
+    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) {
+      status = wuffs_base__error__bad_i_o_position;
+      goto exit;
+    }
+    if (self->private_impl.f_metadata_chunk_length_value > 0) {
+      while (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+        status = wuffs_base__suspension__short_read;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
+      }
+      self->private_impl.f_metadata_chunk_length_value =
+          ((uint64_t)(wuffs_base__load_u8be(iop_a_src)));
+      if (self->private_impl.f_metadata_chunk_length_value > 0) {
+        if (self->private_impl.f_metadata_fourcc_value == 1481461792) {
+          self->private_impl.f_metadata_chunk_length_value += 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))),
+            self->private_impl.f_metadata_chunk_length_value);
+        status = wuffs_base__warning__metadata_reported;
+        goto ok;
+      }
+      (iop_a_src += 1, wuffs_base__make_empty_struct());
+    }
+    self->private_impl.f_call_sequence = 2;
+    self->private_impl.f_metadata_fourcc_value = 0;
+    self->private_impl.f_metadata_io_position = 0;
+    status = NULL;
+    goto ok;
+    goto ok;
+  ok:
+    self->private_impl.p_ack_metadata_chunk[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_ack_metadata_chunk[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.metadata_fourcc
+
+WUFFS_BASE__MAYBE_STATIC uint32_t  //
+wuffs_gif__decoder__metadata_fourcc(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_metadata_fourcc_value;
+}
+
+// -------- func gif.decoder.metadata_chunk_length
+
+WUFFS_BASE__MAYBE_STATIC uint64_t  //
+wuffs_gif__decoder__metadata_chunk_length(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_metadata_chunk_length_value;
+}
+
+// -------- 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__make_rect_ie_u32(0, 0, 0, 0);
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__make_rect_ie_u32(0, 0, 0, 0);
+  }
+
+  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__make_range_ii_u64(0, 0);
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__make_range_ii_u64(0, 0);
+  }
+
+  return wuffs_base__utility__make_range_ii_u64(1, 1);
+}
+
+// -------- 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__error__bad_receiver;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return (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__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 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__error__bad_receiver;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return (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__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__error__interleaved_coroutine_calls;
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = NULL;
+
+  uint8_t v_blend = 0;
+  uint32_t v_background_color = 0;
+  uint8_t v_flags = 0;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  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_blend = self->private_data.s_decode_frame_config[0].v_blend;
+    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) {
+          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) {
+            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) {
+          goto suspend;
+        }
+      }
+    }
+    if (self->private_impl.f_end_of_data) {
+      status = wuffs_base__warning__end_of_data;
+      goto ok;
+    }
+    v_blend = 0;
+    v_background_color = self->private_impl.f_black_color_u32_argb_premul;
+    if (!self->private_impl.f_gc_has_transparent_index) {
+      v_blend = 2;
+      v_background_color =
+          self->private_impl.f_background_color_u32_argb_premul;
+      if (self->private_impl
+              .f_quirk_enabled_first_frame_local_palette_means_black_background &&
+          (self->private_impl.f_num_decoded_frame_configs_value == 0)) {
+        while (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+          status = wuffs_base__suspension__short_read;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(4);
+        }
+        v_flags = wuffs_base__load_u8be(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, v_blend,
+          self->private_impl.f_gc_disposal, 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_blend = v_blend;
+  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 = NULL;
+
+  uint8_t v_flags = 0;
+  uint8_t v_lw = 0;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  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];
+  if (coro_susp_point) {
+  }
+  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__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__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__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_1 = *iop_a_src++;
+      v_lw = t_1;
+    }
+    if (v_lw > 8) {
+      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) {
+      goto suspend;
+    }
+    if (self->private_impl.f_quirk_enabled_delay_num_decoded_frames) {
+      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__slice_u8 a_workbuf,
+                                 wuffs_base__decode_frame_options* a_opts) {
+  if (!self) {
+    return wuffs_base__error__bad_receiver;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return (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__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__error__interleaved_coroutine_calls;
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = NULL;
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_frame[0];
+  if (coro_susp_point) {
+  }
+  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) {
+        goto suspend;
+      }
+    }
+    if (self->private_impl.f_quirk_enabled_reject_empty_frame &&
+        ((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_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);
+    if (status) {
+      goto suspend;
+    }
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+    status = wuffs_gif__decoder__decode_id_part2(self, a_dst, a_src, a_workbuf);
+    if (status) {
+      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 = NULL;
+
+  uint8_t v_block_type = 0;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  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];
+  if (coro_susp_point) {
+  }
+  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__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__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) {
+          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) {
+          goto suspend;
+        }
+        goto label_0_break;
+      } else if (v_block_type == 59) {
+        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;
+      } else {
+        status = wuffs_gif__error__bad_block;
+        goto exit;
+      }
+    }
+  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 = NULL;
+
+  uint8_t v_c[6] = {0};
+  uint32_t v_i = 0;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  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__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_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 = 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;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  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(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__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(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__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__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__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__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(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__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_quirk_enabled_honor_background_color) {
+        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 = NULL;
+
+  uint8_t v_label = 0;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  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];
+  if (coro_susp_point) {
+  }
+  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__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) {
+        goto suspend;
+      }
+      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) {
+        goto suspend;
+      }
+      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) {
+      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 = NULL;
+
+  uint8_t v_block_size = 0;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  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];
+  if (coro_susp_point) {
+  }
+  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__suspension__short_read;
+          goto suspend;
+        }
+        uint8_t t_0 = *iop_a_src++;
+        v_block_size = t_0;
+      }
+      if (v_block_size == 0) {
+        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__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 = 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;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  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) {
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+          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 = 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__suspension__short_read;
+          goto suspend;
+        }
+        iop_a_src += self->private_data.s_decode_ae[0].scratch;
+        goto label_0_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__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__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__suspension__short_read;
+            goto suspend;
+          }
+          iop_a_src += self->private_data.s_decode_ae[0].scratch;
+          goto label_0_break;
+        }
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            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__suspension__short_read;
+            goto suspend;
+          }
+          iop_a_src += self->private_data.s_decode_ae[0].scratch;
+          goto label_0_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(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__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) {
+        while (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+          status = wuffs_base__suspension__short_read;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(10);
+        }
+        self->private_impl.f_metadata_chunk_length_value =
+            ((uint64_t)(wuffs_base__load_u8be(iop_a_src)));
+        (iop_a_src += 1, wuffs_base__make_empty_struct());
+        self->private_impl.f_metadata_fourcc_value = 1229144912;
+        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))),
+            self->private_impl.f_metadata_chunk_length_value);
+        self->private_impl.f_call_sequence = 1;
+        status = wuffs_base__warning__metadata_reported;
+        goto ok;
+      } else if (v_is_xmp && self->private_impl.f_report_metadata_xmp) {
+        while (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+          status = wuffs_base__suspension__short_read;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(11);
+        }
+        self->private_impl.f_metadata_chunk_length_value =
+            ((uint64_t)(wuffs_base__load_u8be(iop_a_src)));
+        if (self->private_impl.f_metadata_chunk_length_value > 0) {
+          self->private_impl.f_metadata_chunk_length_value += 1;
+        } else {
+          (iop_a_src += 1, wuffs_base__make_empty_struct());
+        }
+        self->private_impl.f_metadata_fourcc_value = 1481461792;
+        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))),
+            self->private_impl.f_metadata_chunk_length_value);
+        self->private_impl.f_call_sequence = 1;
+        status = wuffs_base__warning__metadata_reported;
+        goto ok;
+      }
+      goto label_0_break;
+    }
+  label_0_break:;
+    if (a_src) {
+      a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+    }
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(12);
+    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) {
+      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 = NULL;
+
+  uint8_t v_c = 0;
+  uint8_t v_flags = 0;
+  uint16_t v_gc_duration_centiseconds = 0;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  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];
+  if (coro_susp_point) {
+  }
+  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__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_0 = *iop_a_src++;
+      v_c = t_0;
+    }
+    if (v_c != 4) {
+      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__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(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__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__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__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_4 = *iop_a_src++;
+      v_c = t_4;
+    }
+    if (v_c != 0) {
+      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 = NULL;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  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];
+  if (coro_susp_point) {
+  }
+  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(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__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(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__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(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__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(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__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_quirk_enabled_image_bounds_are_strict) {
+      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__status 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 = NULL;
+  uint8_t v_lw = 0;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  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__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(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__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_quirk_enabled_reject_empty_palette &&
+               !self->private_impl.f_has_global_palette) {
+      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,
+        1191444488,
+        wuffs_base__make_slice_u8(
+            self->private_data.f_palettes[v_which_palette], 1024));
+    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__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__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_2 = *iop_a_src++;
+      v_lw = t_2;
+    }
+    if (v_lw > 8) {
+      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__status status = NULL;
+
+  uint64_t v_block_size = 0;
+  bool v_need_block_size = false;
+  uint64_t v_n_compressed = 0;
+  wuffs_base__slice_u8 v_compressed = {0};
+  wuffs_base__io_buffer u_r = wuffs_base__empty_io_buffer();
+  wuffs_base__io_buffer* v_r = &u_r;
+  uint8_t* iop_v_r WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io0_v_r WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_v_r WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_v_r WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint64_t v_mark = 0;
+  wuffs_base__status v_lzw_status = NULL;
+  wuffs_base__status v_copy_status = NULL;
+  wuffs_base__slice_u8 v_uncompressed = {0};
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  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;
+  }
+
+  wuffs_base__io_buffer empty_io_buffer = wuffs_base__empty_io_buffer();
+
+  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_0_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__suspension__short_read;
+            goto suspend;
+          }
+          uint64_t t_0 = *iop_a_src++;
+          v_block_size = t_0;
+        }
+      }
+      if (v_block_size == 0) {
+        goto label_0_break;
+      }
+      while (((uint64_t)(io2_a_src - iop_a_src)) == 0) {
+        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_1_break;
+        }
+        v_compressed =
+            wuffs_base__io_reader__take(&iop_a_src, io2_a_src, v_n_compressed);
+        wuffs_base__slice_u8__copy_from_slice(
+            wuffs_base__slice_u8__subslice_i(
+                wuffs_base__make_slice_u8(self->private_data.f_compressed,
+                                          4096),
+                self->private_impl.f_compressed_wi),
+            v_compressed);
+        wuffs_base__u64__sat_add_indirect(&self->private_impl.f_compressed_wi,
+                                          v_n_compressed);
+        wuffs_base__u64__sat_sub_indirect(&v_block_size, v_n_compressed);
+        if (v_block_size > 0) {
+          goto label_1_break;
+        }
+        if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+          v_need_block_size = true;
+          goto label_1_break;
+        }
+        v_block_size = ((uint64_t)(wuffs_base__load_u8be(iop_a_src)));
+        (iop_a_src += 1, wuffs_base__make_empty_struct());
+      }
+    label_1_break:;
+      if (1 > ((uint64_t)(a_workbuf.len))) {
+        status = wuffs_base__error__bad_workbuf_length;
+        goto exit;
+      }
+    label_2_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_gif__error__internal_error_inconsistent_ri_wi;
+          goto exit;
+        }
+        {
+          wuffs_base__io_buffer* o_0_v_r = v_r;
+          uint8_t* o_0_iop_v_r = iop_v_r;
+          uint8_t* o_0_io0_v_r = io0_v_r;
+          uint8_t* o_0_io1_v_r = io1_v_r;
+          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__decode_io_writer(
+                &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__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) {
+              goto suspend;
+            }
+          }
+          goto label_0_break;
+        } else if (v_lzw_status == wuffs_base__suspension__short_read) {
+          goto label_0_continue;
+        } else if (v_lzw_status == wuffs_base__suspension__short_write) {
+          goto label_2_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__error__cannot_return_a_suspension;
+          goto exit;
+        }
+        goto ok;
+      }
+    }
+  label_0_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__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;
+  uint32_t v_bytes_per_pixel = 0;
+  uint32_t v_pixfmt_channels = 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_channels = (wuffs_base__pixel_buffer__pixel_format(a_pb) & 65535);
+  if (v_pixfmt_channels == 34952) {
+    v_bytes_per_pixel = 4;
+  } else if (v_pixfmt_channels == 2184) {
+    v_bytes_per_pixel = 3;
+  } else if (v_pixfmt_channels == 8) {
+    v_bytes_per_pixel = 1;
+  } else {
+    return wuffs_base__error__unsupported_option;
+  }
+  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_quirk_enabled_ignore_too_much_pixel_data) {
+        return NULL;
+      }
+      return 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(
+          &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_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_gif__error__internal_error_inconsistent_ri_wi;
+    }
+    goto label_0_break;
+  }
+label_0_break:;
+  return 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
+
+// ---------------- 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__error__bad_receiver;
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__error__bad_sizeof_receiver;
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return 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__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) {
+      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) {
+      return z;
+    }
+  }
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  return NULL;
+}
+
+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.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__make_range_ii_u64(0, 0);
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__make_range_ii_u64(0, 0);
+  }
+
+  return wuffs_base__utility__make_range_ii_u64(1, 1);
+}
+
+// -------- func gzip.decoder.decode_io_writer
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_gzip__decoder__decode_io_writer(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__error__bad_receiver;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return (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__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__error__interleaved_coroutine_calls;
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status 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 = 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;
+    }
+  }
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  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_io_writer[0];
+  if (coro_susp_point) {
+    v_flags = self->private_data.s_decode_io_writer[0].v_flags;
+    v_checksum_got = self->private_data.s_decode_io_writer[0].v_checksum_got;
+    v_decoded_length_got =
+        self->private_data.s_decode_io_writer[0].v_decoded_length_got;
+    v_checksum_want = self->private_data.s_decode_io_writer[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__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_0 = *iop_a_src++;
+      v_c = t_0;
+    }
+    if (v_c != 31) {
+      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__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_1 = *iop_a_src++;
+      v_c = t_1;
+    }
+    if (v_c != 139) {
+      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__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_2 = *iop_a_src++;
+      v_c = t_2;
+    }
+    if (v_c != 8) {
+      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__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_3 = *iop_a_src++;
+      v_flags = t_3;
+    }
+    self->private_data.s_decode_io_writer[0].scratch = 6;
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+    if (self->private_data.s_decode_io_writer[0].scratch >
+        ((uint64_t)(io2_a_src - iop_a_src))) {
+      self->private_data.s_decode_io_writer[0].scratch -=
+          ((uint64_t)(io2_a_src - iop_a_src));
+      iop_a_src = io2_a_src;
+      status = wuffs_base__suspension__short_read;
+      goto suspend;
+    }
+    iop_a_src += self->private_data.s_decode_io_writer[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(iop_a_src);
+          iop_a_src += 2;
+        } else {
+          self->private_data.s_decode_io_writer[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__suspension__short_read;
+              goto suspend;
+            }
+            uint64_t* scratch =
+                &self->private_data.s_decode_io_writer[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_decode_io_writer[0].scratch = ((uint32_t)(v_xlen));
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
+      if (self->private_data.s_decode_io_writer[0].scratch >
+          ((uint64_t)(io2_a_src - iop_a_src))) {
+        self->private_data.s_decode_io_writer[0].scratch -=
+            ((uint64_t)(io2_a_src - iop_a_src));
+        iop_a_src = io2_a_src;
+        status = wuffs_base__suspension__short_read;
+        goto suspend;
+      }
+      iop_a_src += self->private_data.s_decode_io_writer[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__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__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_decode_io_writer[0].scratch = 2;
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(11);
+      if (self->private_data.s_decode_io_writer[0].scratch >
+          ((uint64_t)(io2_a_src - iop_a_src))) {
+        self->private_data.s_decode_io_writer[0].scratch -=
+            ((uint64_t)(io2_a_src - iop_a_src));
+        iop_a_src = io2_a_src;
+        status = wuffs_base__suspension__short_read;
+        goto suspend;
+      }
+      iop_a_src += self->private_data.s_decode_io_writer[0].scratch;
+    }
+    if ((v_flags & 224) != 0) {
+      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__decode_io_writer(
+            &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(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_io_writer[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(14);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_io_writer[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(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_io_writer[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(16);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_io_writer[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_gzip__error__bad_checksum;
+      goto exit;
+    }
+
+    goto ok;
+  ok:
+    self->private_impl.p_decode_io_writer[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_io_writer[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_io_writer[0].v_flags = v_flags;
+  self->private_data.s_decode_io_writer[0].v_checksum_got = v_checksum_got;
+  self->private_data.s_decode_io_writer[0].v_decoded_length_got =
+      v_decoded_length_got;
+  self->private_data.s_decode_io_writer[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__ZLIB)
+
+// ---------------- Status Codes Implementations
+
+const char* wuffs_zlib__warning__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
+
+// ---------------- 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__error__bad_receiver;
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__error__bad_sizeof_receiver;
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return 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__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) {
+      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) {
+      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) {
+      return z;
+    }
+  }
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  return NULL;
+}
+
+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.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__make_range_ii_u64(0, 0);
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__make_range_ii_u64(0, 0);
+  }
+
+  return wuffs_base__utility__make_range_ii_u64(1, 1);
+}
+
+// -------- func zlib.decoder.decode_io_writer
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_zlib__decoder__decode_io_writer(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__error__bad_receiver;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return (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__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__error__interleaved_coroutine_calls;
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = NULL;
+
+  uint16_t v_x = 0;
+  uint32_t v_checksum_got = 0;
+  wuffs_base__status v_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;
+    }
+  }
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  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_io_writer[0];
+  if (coro_susp_point) {
+    v_checksum_got = self->private_data.s_decode_io_writer[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__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(iop_a_src);
+          iop_a_src += 2;
+        } else {
+          self->private_data.s_decode_io_writer[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__suspension__short_read;
+              goto suspend;
+            }
+            uint64_t* scratch =
+                &self->private_data.s_decode_io_writer[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_zlib__error__bad_compression_method;
+        goto exit;
+      }
+      if ((v_x >> 12) > 7) {
+        status = wuffs_zlib__error__bad_compression_window_size;
+        goto exit;
+      }
+      if ((v_x % 31) != 0) {
+        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(iop_a_src);
+            iop_a_src += 4;
+          } else {
+            self->private_data.s_decode_io_writer[0].scratch = 0;
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+            while (true) {
+              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                status = wuffs_base__suspension__short_read;
+                goto suspend;
+              }
+              uint64_t* scratch =
+                  &self->private_data.s_decode_io_writer[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_zlib__warning__dictionary_required;
+        goto ok;
+      } else if (self->private_impl.f_got_dictionary) {
+        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_zlib__error__incorrect_dictionary;
+        goto exit;
+      }
+      status = wuffs_zlib__warning__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__decode_io_writer(
+            &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(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_io_writer[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_io_writer[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_zlib__error__bad_checksum;
+      goto exit;
+    }
+
+    goto ok;
+  ok:
+    self->private_impl.p_decode_io_writer[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_io_writer[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_io_writer[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
+
+#endif  // WUFFS_INCLUDE_GUARD
diff --git a/sync.txt b/sync.txt
new file mode 100644
index 0000000..961ba1a
--- /dev/null
+++ b/sync.txt
@@ -0,0 +1,6 @@
+script/sync.sh ran on 2021-03-12
+Sibling directory (../wuffs) git revision is 5767f030a37032c0f39eac0c89d8292238d358cf
+Manifest (sha512sum values, filenames, versions):
+4be987ec98507b4df36d9795510830a7f4890e1d14953f589028cfb5291b60c115bcf0f9db128d4980e31d7945145095ad86d4647f2668008ec282fdd3c70e52  release/c/README.md
+542abc35ca1b6112a2859ff6f89de6210590515c67551ac972da053e036f7e8c92953ee0d6b40c0555e536bde7d137058a2a4648e36916e1a763bbadfb192d64  release/c/wuffs-v0.2.c
+    #define WUFFS_VERSION_STRING "0.2.0+2078.20191219"