#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
// 6b9f658c593bb57851e3fac7df2e5f3949a4fac8 committed on 2019-04-07.
#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 "alpha.36"
#define WUFFS_VERSION_BUILD_METADATA_COMMIT_COUNT 1675
#define WUFFS_VERSION_BUILD_METADATA_COMMIT_DATE 20190407
#define WUFFS_VERSION_STRING "0.2.0-alpha.36+1675.20190407"

// 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".
//
// With or without this bit set, the Wuffs compiler still enforces that no
// reads or writes will overflow internal buffers' bounds. Even with this bit
// set, the Wuffs standard library also considers reading from an uninitialized
// buffer to be a bug, and strives to never do so, but unlike buffer overflows,
// it is not a bug class that the Wuffs compiler eliminates.
//
// For those paranoid about security, leave this bit unset, so that
// wuffs_foo__bar__initialize will initialize the entire struct value to zeroes
// (unless WUFFS_INITIALIZE__ALREADY_ZEROED is set).
//
// Setting this bit gives a small absolute improvement on micro-benchmarks, but
// this can be a large relative effect, up to 2x faster, when the actual work
// to be done is also small, such as decompressing small input. See git commit
// 438fc105 "Move some struct fields to private_data" for some numbers and a
// discussion, noting that its commit message was written before this
// WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED option was defined.
#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;

// --------

// A status is either NULL (meaning OK) or a string message. That message is
// human-readable, for programmers, but it is not for end users. It is not
// localized, and does not contain additional contextual information such as a
// source filename.
//
// Status strings are statically allocated and should never be free'd. They can
// be compared by the == operator and not just by strcmp.
//
// Statuses come in four categories:
//  - OK:          the request was completed, successfully.
//  - Warnings:    the request was completed, unsuccessfully.
//  - Suspensions: the request was not completed, but can be re-tried.
//  - Errors:      the request was not completed, permanently.
//
// When a function returns an incomplete status, a suspension means that that
// function should be called again within a new context, such as after flushing
// or re-filling an I/O buffer. An error means that an irrecoverable failure
// state was reached.
typedef const char* wuffs_base__status;

extern const char* wuffs_base__warning__end_of_data;
extern const char* wuffs_base__suspension__short_read;
extern const char* wuffs_base__suspension__short_write;
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__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 != '#');
}

// --------

// 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__null_slice_u8() {
  wuffs_base__slice_u8 ret;
  ret.ptr = NULL;
  ret.len = 0;
  return ret;
}

static inline wuffs_base__table_u8  //
wuffs_base__null_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

// Ranges are either inclusive ("range_ii") or exclusive ("range_ie") on the
// high end. Both the "ii" and "ie" flavors are useful in practice.
//
// The "ei" and "ee" flavors also exist in theory, but aren't widely used. In
// Wuffs, the low end is always inclusive.
//
// The "ii" (closed interval) flavor is useful when refining e.g. "the set of
// all uint32_t values" to a contiguous subset: "uint32_t values in the closed
// interval [M, N]", for uint32_t values M and N. An unrefined type (in other
// words, the set of all uint32_t values) is not representable in the "ie"
// flavor because if N equals ((1<<32) - 1) then (N + 1) will overflow.
//
// On the other hand, the "ie" (half-open interval) flavor is recommended by
// Dijkstra's "Why numbering should start at zero" at
// http://www.cs.utexas.edu/users/EWD/ewd08xx/EWD831.PDF and a further
// discussion of motivating rationale is at
// https://www.quora.com/Why-are-Python-ranges-half-open-exclusive-instead-of-closed-inclusive
//
// For example, with "ie", the number of elements in "uint32_t values in the
// half-open interval [M, N)" is equal to max(0, N-M). Furthermore, that number
// of elements (in one dimension, a length, in two dimensions, a width or
// height) is itself representable as a uint32_t without overflow, again for
// uint32_t values M and N. In the contrasting "ii" flavor, the length of the
// closed interval [0, (1<<32) - 1] is 1<<32, which cannot be represented as a
// uint32_t. In Wuffs, because of this potential overflow, the "ie" flavor has
// length / width / height methods, but the "ii" flavor does not.
//
// It is valid for min > max (for range_ii) or for min >= max (for range_ie),
// in which case the range is empty. There are multiple representations of an
// empty range.

typedef struct wuffs_base__range_ii_u32__struct {
  uint32_t min_incl;
  uint32_t max_incl;

#ifdef __cplusplus
  inline bool is_empty();
  inline bool equals(wuffs_base__range_ii_u32__struct s);
  inline wuffs_base__range_ii_u32__struct intersect(
      wuffs_base__range_ii_u32__struct s);
  inline wuffs_base__range_ii_u32__struct unite(
      wuffs_base__range_ii_u32__struct s);
  inline bool contains(uint32_t x);
  inline bool contains_range(wuffs_base__range_ii_u32__struct s);
#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(wuffs_base__range_ii_u32* r) {
  return r->min_incl > r->max_incl;
}

static inline bool  //
wuffs_base__range_ii_u32__equals(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(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(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(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(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() {
  return wuffs_base__range_ii_u32__is_empty(this);
}

inline bool  //
wuffs_base__range_ii_u32::equals(wuffs_base__range_ii_u32 s) {
  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) {
  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) {
  return wuffs_base__range_ii_u32__unite(this, s);
}

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

inline bool  //
wuffs_base__range_ii_u32::contains_range(wuffs_base__range_ii_u32 s) {
  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();
  inline bool equals(wuffs_base__range_ie_u32__struct s);
  inline wuffs_base__range_ie_u32__struct intersect(
      wuffs_base__range_ie_u32__struct s);
  inline wuffs_base__range_ie_u32__struct unite(
      wuffs_base__range_ie_u32__struct s);
  inline bool contains(uint32_t x);
  inline bool contains_range(wuffs_base__range_ie_u32__struct s);
  inline uint32_t length();
#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(wuffs_base__range_ie_u32* r) {
  return r->min_incl >= r->max_excl;
}

static inline bool  //
wuffs_base__range_ie_u32__equals(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(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(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(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(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(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() {
  return wuffs_base__range_ie_u32__is_empty(this);
}

inline bool  //
wuffs_base__range_ie_u32::equals(wuffs_base__range_ie_u32 s) {
  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) {
  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) {
  return wuffs_base__range_ie_u32__unite(this, s);
}

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

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

inline uint32_t  //
wuffs_base__range_ie_u32::length() {
  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();
  inline bool equals(wuffs_base__range_ii_u64__struct s);
  inline wuffs_base__range_ii_u64__struct intersect(
      wuffs_base__range_ii_u64__struct s);
  inline wuffs_base__range_ii_u64__struct unite(
      wuffs_base__range_ii_u64__struct s);
  inline bool contains(uint64_t x);
  inline bool contains_range(wuffs_base__range_ii_u64__struct s);
#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(wuffs_base__range_ii_u64* r) {
  return r->min_incl > r->max_incl;
}

static inline bool  //
wuffs_base__range_ii_u64__equals(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(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(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(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(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() {
  return wuffs_base__range_ii_u64__is_empty(this);
}

inline bool  //
wuffs_base__range_ii_u64::equals(wuffs_base__range_ii_u64 s) {
  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) {
  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) {
  return wuffs_base__range_ii_u64__unite(this, s);
}

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

inline bool  //
wuffs_base__range_ii_u64::contains_range(wuffs_base__range_ii_u64 s) {
  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();
  inline bool equals(wuffs_base__range_ie_u64__struct s);
  inline wuffs_base__range_ie_u64__struct intersect(
      wuffs_base__range_ie_u64__struct s);
  inline wuffs_base__range_ie_u64__struct unite(
      wuffs_base__range_ie_u64__struct s);
  inline bool contains(uint64_t x);
  inline bool contains_range(wuffs_base__range_ie_u64__struct s);
  inline uint64_t length();
#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(wuffs_base__range_ie_u64* r) {
  return r->min_incl >= r->max_excl;
}

static inline bool  //
wuffs_base__range_ie_u64__equals(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(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(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(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(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(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() {
  return wuffs_base__range_ie_u64__is_empty(this);
}

inline bool  //
wuffs_base__range_ie_u64::equals(wuffs_base__range_ie_u64 s) {
  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) {
  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) {
  return wuffs_base__range_ie_u64__unite(this, s);
}

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

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

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

#endif  // __cplusplus

// --------

// wuffs_base__rect_ii_u32 is a rectangle (a 2-dimensional range) on the
// integer grid. The "ii" means that the bounds are inclusive on the low end
// and inclusive on the high end. It contains all points (x, y) such that
// ((min_incl_x <= x) && (x <= max_incl_x)) and likewise for y.
//
// It is valid for min > max, in which case the rectangle is empty. There are
// multiple representations of an empty rectangle.
//
// The X and Y axes increase right and down.
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();
  inline bool equals(wuffs_base__rect_ii_u32__struct s);
  inline wuffs_base__rect_ii_u32__struct intersect(
      wuffs_base__rect_ii_u32__struct s);
  inline wuffs_base__rect_ii_u32__struct unite(
      wuffs_base__rect_ii_u32__struct s);
  inline bool contains(uint32_t x, uint32_t y);
  inline bool contains_rect(wuffs_base__rect_ii_u32__struct s);
#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(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(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(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(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(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(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() {
  return wuffs_base__rect_ii_u32__is_empty(this);
}

inline bool  //
wuffs_base__rect_ii_u32::equals(wuffs_base__rect_ii_u32 s) {
  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) {
  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) {
  return wuffs_base__rect_ii_u32__unite(this, s);
}

inline bool  //
wuffs_base__rect_ii_u32::contains(uint32_t x, uint32_t y) {
  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) {
  return wuffs_base__rect_ii_u32__contains_rect(this, s);
}

#endif  // __cplusplus

// --------

// wuffs_base__rect_ie_u32 is a rectangle (a 2-dimensional range) on the
// integer grid. The "ie" means that the bounds are inclusive on the low end
// and exclusive on the high end. It contains all points (x, y) such that
// ((min_incl_x <= x) && (x < max_excl_x)) and likewise for y.
//
// It is valid for min >= max, in which case the rectangle is empty. There are
// multiple representations of an empty rectangle, including a value with all
// fields zero.
//
// The X and Y axes increase right and down.
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();
  inline bool equals(wuffs_base__rect_ie_u32__struct s);
  inline wuffs_base__rect_ie_u32__struct intersect(
      wuffs_base__rect_ie_u32__struct s);
  inline wuffs_base__rect_ie_u32__struct unite(
      wuffs_base__rect_ie_u32__struct s);
  inline bool contains(uint32_t x, uint32_t y);
  inline bool contains_rect(wuffs_base__rect_ie_u32__struct s);
  inline uint32_t width();
  inline uint32_t height();
#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(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(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(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(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(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(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(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(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() {
  return wuffs_base__rect_ie_u32__is_empty(this);
}

inline bool  //
wuffs_base__rect_ie_u32::equals(wuffs_base__rect_ie_u32 s) {
  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) {
  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) {
  return wuffs_base__rect_ie_u32__unite(this, s);
}

inline bool  //
wuffs_base__rect_ie_u32::contains(uint32_t x, uint32_t y) {
  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) {
  return wuffs_base__rect_ie_u32__contains_rect(this, s);
}

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

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

#endif  // __cplusplus

// ---------------- I/O

struct wuffs_base__io_buffer__struct;

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 {
    struct wuffs_base__io_buffer__struct* buf;
    // The bounds values are typically NULL, when created by the Wuffs public
    // API. NULL means that the callee substitutes the implicit bounds derived
    // from buf.
    uint8_t* mark;
    uint8_t* limit;
  } private_impl;
} wuffs_base__io_reader;

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 {
    struct wuffs_base__io_buffer__struct* buf;
    // The bounds values are typically NULL, when created by the Wuffs public
    // API. NULL means that the callee substitutes the implicit bounds derived
    // from buf.
    uint8_t* mark;
    uint8_t* limit;
  } private_impl;
} wuffs_base__io_writer;

// 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__io_buffer__struct {
  wuffs_base__slice_u8 data;
  wuffs_base__io_buffer_meta meta;

#ifdef __cplusplus
  inline void compact();
  inline wuffs_base__io_reader reader();
  inline wuffs_base__io_writer writer();
  inline uint64_t reader_io_position();
  inline uint64_t writer_io_position();
#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__null_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__null_io_buffer_meta() {
  wuffs_base__io_buffer_meta ret;
  ret.wi = 0;
  ret.ri = 0;
  ret.pos = 0;
  ret.closed = false;
  return ret;
}

static inline wuffs_base__io_reader  //
wuffs_base__null_io_reader() {
  wuffs_base__io_reader ret;
  ret.private_impl.buf = NULL;
  ret.private_impl.mark = NULL;
  ret.private_impl.limit = NULL;
  return ret;
}

static inline wuffs_base__io_writer  //
wuffs_base__null_io_writer() {
  wuffs_base__io_writer ret;
  ret.private_impl.buf = NULL;
  ret.private_impl.mark = NULL;
  ret.private_impl.limit = NULL;
  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 wuffs_base__io_reader  //
wuffs_base__io_buffer__reader(wuffs_base__io_buffer* buf) {
  wuffs_base__io_reader ret;
  ret.private_impl.buf = buf;
  ret.private_impl.mark = NULL;
  ret.private_impl.limit = NULL;
  return ret;
}

static inline wuffs_base__io_writer  //
wuffs_base__io_buffer__writer(wuffs_base__io_buffer* buf) {
  wuffs_base__io_writer ret;
  ret.private_impl.buf = buf;
  ret.private_impl.mark = NULL;
  ret.private_impl.limit = NULL;
  return ret;
}

static inline uint64_t  //
wuffs_base__io_buffer__reader_io_position(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_io_position(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__struct::compact() {
  wuffs_base__io_buffer__compact(this);
}

inline wuffs_base__io_reader  //
wuffs_base__io_buffer__struct::reader() {
  return wuffs_base__io_buffer__reader(this);
}

inline wuffs_base__io_writer  //
wuffs_base__io_buffer__struct::writer() {
  return wuffs_base__io_buffer__writer(this);
}

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

inline uint64_t  //
wuffs_base__io_buffer__struct::writer_io_position() {
  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. Its bits:
//  - bit        31  is reserved.
//  - bits 30 .. 28 encodes color (and channel order, in terms of memory).
//  - bit        27  is reserved.
//  - bits 26 .. 24 encodes transparency.
//  - bits 23 .. 21 are reserved.
//  - bit        20 indicates big-endian/MSB-first (as opposed to little/LSB).
//  - bit        19 indicates floating point (as opposed to integer).
//  - bit        18 indicates palette-indexed. The number-of-planes (the next
//                  field) will be zero, as the format is considered packed,
//                  but the 8-bit N-BGRA color data is stored in plane 3.
//  - bits 17 .. 16 are the number of planes, minus 1. Zero means packed.
//  - bits 15 .. 12 encodes the number of bits (depth) in the 3rd channel.
//  - bits 11 ..  8 encodes the number of bits (depth) in the 2nd channel.
//  - bits  7 ..  4 encodes the number of bits (depth) in the 1st channel.
//  - bits  3 ..  0 encodes the number of bits (depth) in the 0th channel.
//
// The bit fields of a wuffs_base__pixel_format are not independent. For
// example, the number of planes should not be greater than the number of
// channels. Similarly, bits 15..4 are unused (and should be zero) if bits
// 31..24 (color and transparency) together imply only 1 channel (gray, no
// alpha) and floating point samples should mean a bit depth of 16, 32 or 64.
//
// Formats hold between 1 and 4 channels. For example: Y (1 channel: gray), YA
// (2 channels: gray and alpha), BGR (3 channels: blue, green, red) or CMYK (4
// channels: cyan, magenta, yellow, black).
//
// For direct formats with N > 1 channels, those channels can be laid out in
// either 1 (packed) or N (planar) planes. For example, RGBA data is usually
// packed, but YCbCr data is usually planar, due to chroma subsampling (for
// details, see the wuffs_base__pixel_subsampling type).
//
// For indexed formats, the palette (always 256 × 4 bytes) holds 8 bits per
// channel non-alpha-premultiplied BGRA color data. There is only 1 plane (for
// the index), as the format is considered packed. Plane 0 holds the per-pixel
// indices. Plane 3 is re-purposed to hold the per-index colors.
//
// The color field is encoded in 3 bits:
//  - 0 means                   A (Alpha).
//  - 1 means Y         or     YA (Gray, Alpha).
//  - 2 means YCbCr     or YCbCrA (Luma, Chroma-blue, Chroma-red, Alpha).
//  - 3 means YCoCg     or YCoCgA (Luma, Chroma-orange, Chroma-green, Alpha).
//  - 4 means BGR, BGRX or   BGRA (Blue, Green, Red, X-padding or Alpha).
//  - 5 means RGB, RGBX or   RGBA (Red, Green, Blue, X-padding or Alpha).
//  - 6 means CMY       or   CMYK (Cyan, Magenta, Yellow, Black).
//  - all other values are reserved.
//
// In Wuffs, channels are given in memory order (also known as byte order),
// regardless of endianness, since the C type for the pixel data is an array of
// bytes, not an array of uint32_t. For example, packed BGRA with 8 bits per
// channel means that the bytes in memory are always Blue, Green, Red then
// Alpha. On big-endian systems, that is the uint32_t 0xBBGGRRAA. On
// little-endian, 0xAARRGGBB.
//
// When the color field (3 bits) encodes multiple options, the transparency
// field (3 bits) distinguishes them:
//  - 0 means fully opaque, no extra channels
//  - 1 means fully opaque, one extra channel (X or K, padding or black).
//  - 5 means one extra alpha channel, other channels are non-premultiplied.
//  - 6 means one extra alpha channel, other channels are     premultiplied.
//  - 7 means one extra alpha channel, binary alpha.
//  - all other values are reserved.
//
// Binary alpha means that if a color is not completely opaque, it is
// completely transparent black. As a source pixel format, it can therefore be
// treated as either non-premultiplied or premultiplied.
//
// The zero wuffs_base__pixel_format value is an invalid pixel format, as it is
// invalid to combine the zero color (alpha only) with the zero transparency.
//
// Bit depth is encoded in 4 bits:
//  -  0 means the channel or index is unused.
//  -  x means a bit depth of  x, for x in the range 1..8.
//  -  9 means a bit depth of 10.
//  - 10 means a bit depth of 12.
//  - 11 means a bit depth of 16.
//  - 12 means a bit depth of 24.
//  - 13 means a bit depth of 32.
//  - 14 means a bit depth of 48.
//  - 15 means a bit depth of 64.
//
// For example, wuffs_base__pixel_format 0x5510BBBB is a natural format for
// decoding a PNG image - network byte order (also known as big-endian),
// packed, non-premultiplied alpha - that happens to be 16-bit-depth truecolor
// with alpha (RGBA). In memory order:
//
//  ptr+0  ptr+1  ptr+2  ptr+3  ptr+4  ptr+5  ptr+6  ptr+7
//  Rhi    Rlo    Ghi    Glo    Bhi    Blo    Ahi    Alo
//
// For example, the value wuffs_base__pixel_format 0x40000565 means BGR with no
// alpha or padding, 5/6/5 bits for blue/green/red, packed 2 bytes per pixel,
// laid out LSB-first in memory order:
//
//  ptr+0...........  ptr+1...........
//  MSB          LSB  MSB          LSB
//  G₂G₁G₀B₄B₃B₂B₁B₀  R₄R₃R₂R₁R₀G₅G₄G₃
//
// On little-endian systems (but not big-endian), this Wuffs pixel format value
// (0x40000565) corresponds to the Cairo library's CAIRO_FORMAT_RGB16_565, the
// SDL2 (Simple DirectMedia Layer 2) library's SDL_PIXELFORMAT_RGB565 and the
// Skia library's kRGB_565_SkColorType. Note BGR in Wuffs versus RGB in the
// other libraries.
//
// Regardless of endianness, this Wuffs pixel format value (0x40000565)
// corresponds to the V4L2 (Video For Linux 2) library's V4L2_PIX_FMT_RGB565
// and the Wayland-DRM library's WL_DRM_FORMAT_RGB565.
//
// Different software libraries name their pixel formats (and especially their
// channel order) either according to memory layout or as bits of a native
// integer type like uint32_t. The two conventions differ because of a system's
// endianness. As mentioned earlier, Wuffs pixel formats are always in memory
// order. More detail of other software libraries' naming conventions is in the
// Pixel Format Guide at https://afrantzis.github.io/pixel-format-guide/
//
// Do not manipulate these 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, for packed pixel formats,
// the number of bits per pixel. It 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_packed(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 the mapping of pixel space coordinates
// (x, y) to pixel buffer indices (i, j). That mapping can differ for each
// plane p. For a depth of 8 bits (1 byte), the p'th plane's sample starts at
// (planes[p].ptr + (j * planes[p].stride) + i).
//
// For packed pixel formats, the mapping is trivial: i = x and j = y. For
// planar pixel formats, the mapping can differ due to chroma subsampling. For
// example, consider a three plane YCbCr pixel format with 4:2:2 subsampling.
// For the luma (Y) channel, there is one sample for every pixel, but for the
// chroma (Cb, Cr) channels, there is one sample for every two pixels: pairs of
// horizontally adjacent pixels form one macropixel, i = x / 2 and j == y. In
// general, for a given p:
//  - i = (x + bias_x) >> shift_x.
//  - j = (y + bias_y) >> shift_y.
// where biases and shifts are in the range 0..3 and 0..2 respectively.
//
// In general, the biases will be zero after decoding an image. However, making
// a sub-image may change the bias, since the (x, y) coordinates are relative
// to the sub-image's top-left origin, but the backing pixel buffers were
// created relative to the original image's origin.
//
// For each plane p, each of those four numbers (biases and shifts) are encoded
// in two bits, which combine to form an 8 bit unsigned integer:
//
//  e_p = (bias_x << 6) | (shift_x << 4) | (bias_y << 2) | (shift_y << 0)
//
// Those e_p values (e_0 for the first plane, e_1 for the second plane, etc)
// combine to form a wuffs_base__pixel_subsampling value:
//
//  pixsub = (e_3 << 24) | (e_2 << 16) | (e_1 << 8) | (e_0 << 0)
//
// Do not manipulate these 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)0x202000)
#define WUFFS_BASE__PIXEL_SUBSAMPLING__410 \
  ((wuffs_base__pixel_subsampling)0x212100)

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__shift_x(wuffs_base__pixel_subsampling s,
                                       uint32_t plane) {
  uint32_t shift = ((plane & 0x03) * 8) + 4;
  return (s >> shift) & 0x03;
}

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__shift_y(wuffs_base__pixel_subsampling s,
                                       uint32_t plane) {
  uint32_t shift = ((plane & 0x03) * 8) + 0;
  return (s >> shift) & 0x03;
}

// --------

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();
  inline wuffs_base__pixel_format pixel_format();
  inline wuffs_base__pixel_subsampling pixel_subsampling();
  inline wuffs_base__rect_ie_u32 bounds();
  inline uint32_t width();
  inline uint32_t height();
  inline uint64_t pixbuf_len();
#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(wuffs_base__pixel_config* c) {
  return c && c->private_impl.pixfmt;
}

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

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

static inline wuffs_base__rect_ie_u32  //
wuffs_base__pixel_config__bounds(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(wuffs_base__pixel_config* c) {
  return c ? c->private_impl.width : 0;
}

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

// TODO: this is the right API for planar (not packed) 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(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() {
  return wuffs_base__pixel_config__is_valid(this);
}

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

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

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

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

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

inline uint64_t  //
wuffs_base__pixel_config::pixbuf_len() {
  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();
  inline uint64_t first_frame_io_position();
  inline bool first_frame_is_opaque();
#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(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(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(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() {
  return wuffs_base__image_config__is_valid(this);
}

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

inline bool  //
wuffs_base__image_config::first_frame_is_opaque() {
  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;
  } 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);
  inline wuffs_base__rect_ie_u32 bounds();
  inline uint32_t width();
  inline uint32_t height();
  inline wuffs_base__flicks duration();
  inline uint64_t index();
  inline uint64_t io_position();
  inline wuffs_base__animation_blend blend();
  inline wuffs_base__animation_disposal disposal();
#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) {
  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;
}

static inline wuffs_base__rect_ie_u32  //
wuffs_base__frame_config__bounds(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(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(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(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(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(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(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(wuffs_base__frame_config* c) {
  return c ? c->private_impl.disposal : 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__frame_config__update(this, bounds, duration, index, io_position,
                                   blend, disposal);
}

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

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

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

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

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

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

inline wuffs_base__animation_blend  //
wuffs_base__frame_config::blend() {
  return wuffs_base__frame_config__blend(this);
}

inline wuffs_base__animation_disposal  //
wuffs_base__frame_config::disposal() {
  return wuffs_base__frame_config__disposal(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(wuffs_base__pixel_config* pixcfg,
                                           wuffs_base__slice_u8 pixbuf_memory);
  inline wuffs_base__slice_u8 palette();
  inline wuffs_base__pixel_format pixel_format();
  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__null_table_u8();
  ret.private_impl.planes[1] = wuffs_base__null_table_u8();
  ret.private_impl.planes[2] = wuffs_base__null_table_u8();
  ret.private_impl.planes[3] = wuffs_base__null_table_u8();
  return ret;
}

static inline wuffs_base__status  //
wuffs_base__pixel_buffer__set_from_slice(wuffs_base__pixel_buffer* b,
                                         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__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)) {
    return wuffs_base__error__bad_argument;
  }
  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;
}

// 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(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(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__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() {
  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 void 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_packed(wuffs_base__slice_u8 dst,
                                 wuffs_base__slice_u8 dst_palette,
                                 wuffs_base__slice_u8 src);
#endif  // __cplusplus

} wuffs_base__pixel_swizzler;

// TODO: should prepare (both the C and C++ methods) return a status?

void  //
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_packed(wuffs_base__pixel_swizzler* p,
                                           wuffs_base__slice_u8 dst,
                                           wuffs_base__slice_u8 dst_palette,
                                           wuffs_base__slice_u8 src);

#ifdef __cplusplus

inline void  //
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) {
  wuffs_base__pixel_swizzler__prepare(this, dst_format, dst_palette, src_format,
                                      src_palette);
}

uint64_t  //
wuffs_base__pixel_swizzler::swizzle_packed(wuffs_base__slice_u8 dst,
                                           wuffs_base__slice_u8 dst_palette,
                                           wuffs_base__slice_u8 src) {
  return wuffs_base__pixel_swizzler__swizzle_packed(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(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(wuffs_base__slice_u8 a_x) {
    return wuffs_adler32__hasher__update(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(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(wuffs_base__slice_u8 a_x) {
    return wuffs_crc32__ieee_hasher__update(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

static const uint64_t                                       //
    wuffs_deflate__decoder_workbuf_len_max_incl_worst_case  //
        WUFFS_BASE__POTENTIALLY_UNUSED = 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__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_writer a_dst,
                                         wuffs_base__io_reader 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__range_ii_u64  //
  workbuf_len() const {
    return wuffs_deflate__decoder__workbuf_len(this);
  }

  inline wuffs_base__status  //
  decode_io_writer(wuffs_base__io_writer a_dst,
                   wuffs_base__io_reader 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

static const uint64_t                                   //
    wuffs_lzw__decoder_workbuf_len_max_incl_worst_case  //
        WUFFS_BASE__POTENTIALLY_UNUSED = 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_writer a_dst,
                                     wuffs_base__io_reader 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_writer a_dst,
                   wuffs_base__io_reader 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_graphic_control;
extern const char* wuffs_gif__error__bad_header;
extern const char* wuffs_gif__error__bad_literal_width;

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

#define WUFFS_GIF__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 1

static const uint64_t                                   //
    wuffs_gif__decoder_workbuf_len_max_incl_worst_case  //
        WUFFS_BASE__POTENTIALLY_UNUSED = 1;

// ---------------- 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__status  //
wuffs_gif__decoder__decode_image_config(wuffs_gif__decoder* self,
                                        wuffs_base__image_config* a_dst,
                                        wuffs_base__io_reader a_src);

WUFFS_BASE__MAYBE_STATIC uint32_t  //
wuffs_gif__decoder__num_animation_loops(const wuffs_gif__decoder* self);

WUFFS_BASE__MAYBE_STATIC uint64_t  //
wuffs_gif__decoder__num_decoded_frame_configs(const wuffs_gif__decoder* self);

WUFFS_BASE__MAYBE_STATIC uint64_t  //
wuffs_gif__decoder__num_decoded_frames(const wuffs_gif__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32  //
wuffs_gif__decoder__frame_dirty_rect(const wuffs_gif__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
wuffs_gif__decoder__workbuf_len(const wuffs_gif__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gif__decoder__restart_frame(wuffs_gif__decoder* self,
                                  uint64_t a_index,
                                  uint64_t a_io_position);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gif__decoder__decode_frame_config(wuffs_gif__decoder* self,
                                        wuffs_base__frame_config* a_dst,
                                        wuffs_base__io_reader 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_reader 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_end_of_data;
    bool f_restarted;
    bool f_previous_lzw_decode_ended_abruptly;
    uint8_t f_which_palette;
    uint8_t f_interlace;
    bool f_seen_num_loops;
    uint32_t f_num_loops;
    bool f_seen_graphic_control;
    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;
    wuffs_base__range_ie_u32 f_dirty_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_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 {
      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;
      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_not_animexts;
      bool v_not_netscape;
      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 {
      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__status  //
  decode_image_config(wuffs_base__image_config* a_dst,
                      wuffs_base__io_reader a_src) {
    return wuffs_gif__decoder__decode_image_config(this, a_dst, a_src);
  }

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

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

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

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

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

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

  inline wuffs_base__status  //
  decode_frame_config(wuffs_base__frame_config* a_dst,
                      wuffs_base__io_reader 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_reader 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

static const uint64_t                                    //
    wuffs_gzip__decoder_workbuf_len_max_incl_worst_case  //
        WUFFS_BASE__POTENTIALLY_UNUSED = 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_writer a_dst,
                                      wuffs_base__io_reader 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_writer a_dst,
                   wuffs_base__io_reader 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__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;

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

#define WUFFS_ZLIB__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 1

static const uint64_t                                    //
    wuffs_zlib__decoder_workbuf_len_max_incl_worst_case  //
        WUFFS_BASE__POTENTIALLY_UNUSED = 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 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_writer a_dst,
                                      wuffs_base__io_reader 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_ignore_checksum;

    uint32_t p_decode_io_writer[1];
  } private_impl;

  struct {
    wuffs_adler32__hasher f_checksum;
    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 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_writer a_dst,
                   wuffs_base__io_reader 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__null_slice_u8 wuffs_base__null_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 bool  //
wuffs_base__io_buffer__is_valid(wuffs_base__io_buffer buf) {
  return (buf.data.ptr || (buf.data.len == 0)) &&
         (buf.data.len >= buf.meta.wi) && (buf.meta.wi >= buf.meta.ri);
}

// TODO: wuffs_base__io_reader__is_eof is no longer used by Wuffs per se, but
// it might be handy to programs that use Wuffs. Either delete it, or promote
// it to the public API.
//
// If making this function public (i.e. moving it to base-header.h), it also
// needs to allow NULL (i.e. implicit, callee-calculated) mark/limit.

static inline bool  //
wuffs_base__io_reader__is_eof(wuffs_base__io_reader o) {
  wuffs_base__io_buffer* buf = o.private_impl.buf;
  return buf && buf->meta.closed &&
         (buf->data.ptr + buf->meta.wi == o.private_impl.limit);
}

static inline bool  //
wuffs_base__io_reader__is_valid(wuffs_base__io_reader o) {
  wuffs_base__io_buffer* buf = o.private_impl.buf;
  // Note: if making this function public (i.e. moving it to base-header.h), it
  // also needs to allow NULL (i.e. implicit, callee-calculated) mark/limit.
  return buf ? ((buf->data.ptr <= o.private_impl.mark) &&
                (o.private_impl.mark <= o.private_impl.limit) &&
                (o.private_impl.limit <= buf->data.ptr + buf->data.len))
             : ((o.private_impl.mark == NULL) &&
                (o.private_impl.limit == NULL));
}

static inline bool  //
wuffs_base__io_writer__is_valid(wuffs_base__io_writer o) {
  wuffs_base__io_buffer* buf = o.private_impl.buf;
  // Note: if making this function public (i.e. moving it to base-header.h), it
  // also needs to allow NULL (i.e. implicit, callee-calculated) mark/limit.
  return buf ? ((buf->data.ptr <= o.private_impl.mark) &&
                (o.private_impl.mark <= o.private_impl.limit) &&
                (o.private_impl.limit <= buf->data.ptr + buf->data.len))
             : ((o.private_impl.mark == NULL) &&
                (o.private_impl.limit == NULL));
}

static inline uint32_t  //
wuffs_base__io_writer__copy_n_from_history(uint8_t** ptr_iop_w,
                                           uint8_t* io0_w,
                                           uint8_t* io1_w,
                                           uint32_t length,
                                           uint32_t distance) {
  if (!distance) {
    return 0;
  }
  uint8_t* p = *ptr_iop_w;
  if ((size_t)(p - io0_w) < (size_t)(distance)) {
    return 0;
  }
  uint8_t* q = p - distance;
  size_t n = (size_t)(io1_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 - io0_w)
//  - length   <= (io1_w      - *ptr_iop_w)
static inline uint32_t  //
wuffs_base__io_writer__copy_n_from_history_fast(uint8_t** ptr_iop_w,
                                                uint8_t* io0_w,
                                                uint8_t* io1_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* io1_w,
                                          uint32_t length,
                                          uint8_t** ptr_iop_r,
                                          uint8_t* io1_r) {
  uint8_t* iop_w = *ptr_iop_w;
  size_t n = length;
  if (n > ((size_t)(io1_w - iop_w))) {
    n = (size_t)(io1_w - iop_w);
  }
  uint8_t* iop_r = *ptr_iop_r;
  if (n > ((size_t)(io1_r - iop_r))) {
    n = (size_t)(io1_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* io1_w,
                                       wuffs_base__slice_u8 src) {
  uint8_t* iop_w = *ptr_iop_w;
  size_t n = src.len;
  if (n > ((size_t)(io1_w - iop_w))) {
    n = (size_t)(io1_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* io1_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)(io1_w - iop_w))) {
    n = (size_t)(io1_w - iop_w);
  }
  if (n > 0) {
    memmove(iop_w, src.ptr, n);
    *ptr_iop_w += n;
  }
  return (uint32_t)(n);
}

static inline wuffs_base__empty_struct  //
wuffs_base__io_reader__set(wuffs_base__io_reader* o,
                           wuffs_base__io_buffer* b,
                           uint8_t** ptr_iop_r,
                           uint8_t** ptr_io1_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;

  o->private_impl.buf = b;
  o->private_impl.mark = data.ptr;
  o->private_impl.limit = data.ptr + data.len;
  *ptr_iop_r = data.ptr;
  *ptr_io1_r = data.ptr + data.len;

  wuffs_base__empty_struct ret;
  ret.private_impl = 0;
  return ret;
}

static inline wuffs_base__empty_struct  //
wuffs_base__io_reader__set_limit(wuffs_base__io_reader* o,
                                 uint8_t* iop_r,
                                 uint64_t limit) {
  if (o && (((size_t)(o->private_impl.limit - iop_r)) > limit)) {
    o->private_impl.limit = iop_r + limit;
  }

  wuffs_base__empty_struct ret;
  ret.private_impl = 0;
  return ret;
}

static inline wuffs_base__empty_struct  //
wuffs_base__io_reader__set_mark(wuffs_base__io_reader* o, uint8_t* mark) {
  o->private_impl.mark = mark;

  wuffs_base__empty_struct ret;
  ret.private_impl = 0;
  return ret;
}

static inline wuffs_base__slice_u8  //
wuffs_base__io_reader__take(uint8_t** ptr_iop_r, uint8_t* io1_r, uint64_t n) {
  if (n <= ((size_t)(io1_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__empty_struct  //
wuffs_base__io_writer__set(wuffs_base__io_writer* o,
                           wuffs_base__io_buffer* b,
                           uint8_t** ptr_iop_w,
                           uint8_t** ptr_io1_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;

  o->private_impl.buf = b;
  o->private_impl.mark = data.ptr;
  o->private_impl.limit = data.ptr + data.len;
  *ptr_iop_w = data.ptr;
  *ptr_io1_w = data.ptr + data.len;

  wuffs_base__empty_struct ret;
  ret.private_impl = 0;
  return ret;
}

static inline wuffs_base__empty_struct  //
wuffs_base__io_writer__set_mark(wuffs_base__io_writer* o, uint8_t* mark) {
  o->private_impl.mark = mark;

  wuffs_base__empty_struct ret;
  ret.private_impl = 0;
  return ret;
}

  // ---------------- I/O (Utility)

#define wuffs_base__utility__null_io_reader wuffs_base__null_io_reader
#define wuffs_base__utility__null_io_writer wuffs_base__null_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__suspension__short_read = "$base: short read";
const char* wuffs_base__suspension__short_write = "$base: short write";
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__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_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;
  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;
}

void  //
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;
  }

  // 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__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__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;
}

uint64_t  //
wuffs_base__pixel_swizzler__swizzle_packed(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 {
    void* p = &(self->private_impl);
    size_t n = sizeof(self->private_impl);
    if ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      p = self;
      n = sizeof(*self);
      initialize_flags |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    }
    memset(p, 0, n);
  }

  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

WUFFS_BASE__MAYBE_STATIC uint32_t  //
wuffs_adler32__hasher__update(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,
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            2365387135, 391757072,  1673614495, 4167309552, 2415577600,
            341804655,  1724586270, 4251866481, 2331019137, 290835438,
            1707942497, 4268256782, 2314648830, 307490961,  1826587164,
            4152020595, 2162433155, 457265388,  1876539747, 4101829900,
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            2029433880, 3813931127, 2496473735, 258500328,  2079362919,
            3763716872, 2546668024, 208559511,  2130363110, 3848244873,
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            2011718299, 3964481268, 2614361092, 7778411,    1927425818,
            3913769845, 2665066885, 92077546,   1910772837, 3930150922,
            2648673018, 108709525,  1352980496, 3405878399, 3164554895,
            658115296,  1403183983, 3355946752, 3214507504, 607924639,
            1453895406, 3440239233, 3130208369, 557218846,  1437504913,
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            3543158663, 2762906999, 1057739032, 1267939479, 3493229816,
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            3694041348, 2880457716, 806684571,  1115789546, 3643069573,
            2931426933, 891243034,  1099408277, 3659722746, 2914794762,
            907637093,
        },
        {
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            489665299,  2699419613, 2104690264, 1510200173, 2274691816,
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            121507914,  2051872274, 2816200599, 437363545,  3347544796,
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            3028835344, 1763607957, 1315852448, 2482538789, 775087595,
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            1739236014, 3124525867, 133568485,  3663777376, 4245691221,
            545702608,  2639048222, 1088059291, 1034514883, 3762268230,
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            1206151121, 2591211092, 666423962,  4197321503, 2271022407,
            1523307714, 3875649548, 982999433,  2850034278, 1953942499,
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            129100416,  3128657486, 1743609803, 1084066558, 2634765179,
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            1039043750,
        },
        {
            0,          2635063670, 3782132909, 2086741467, 430739227,
            2225303149, 4173482934, 1707977408, 861478454,  2924937024,
            3526875803, 1329085421, 720736557,  3086643291, 3415954816,
            1452586230, 1722956908, 4223524122, 2279405761, 450042295,
            2132718455, 3792785921, 2658170842, 58693292,   1441473114,
            3370435372, 3028674295, 696911745,  1279765825, 3511176247,
            2905172460, 807831706,  3445913816, 1349228974, 738901109,
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            1253605401, 3619119471, 2994391983, 796207833,  1393823490,
            3457937012, 2559531650, 92322804,   2044829231, 3840835417,
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            3702920839, 2698457948, 1037619754, 1477802218, 3306854812,
            3111894087, 611605809,  1927342535, 4025419953, 2475568490,
            243387420,  1800169180, 4131620778, 2317525617, 388842247,
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            1195825833, 3662232543, 3933188933, 2002801203, 184645608,
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            3198893512, 3680933640, 1181316734, 973624229,  2802299603,
            4052944421, 1822222163, 285065864,  2381456382, 3896478014,
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            1763466407, 4094934481, 2289211402, 360544636,  1890636732,
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            3140191804, 639919946,  1139395978, 3739626748, 2726758695,
            1065936977,
        },
        {
            0,          3120290792, 2827399569, 293431929,  2323408227,
            864534155,  586863858,  2600537882, 3481914503, 1987188591,
            1729068310, 3740575486, 1173727716, 4228805132, 3983743093,
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        },
};

// ---------------- 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 {
    void* p = &(self->private_impl);
    size_t n = sizeof(self->private_impl);
    if ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      p = self;
      n = sizeof(*self);
      initialize_flags |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    }
    memset(p, 0, n);
  }

  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

WUFFS_BASE__MAYBE_STATIC uint32_t  //
wuffs_crc32__ieee_hasher__update(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,
};

static const uint32_t                //
    wuffs_deflate__huffs_table_size  //
        WUFFS_BASE__POTENTIALLY_UNUSED = 1024;

static const uint32_t                //
    wuffs_deflate__huffs_table_mask  //
        WUFFS_BASE__POTENTIALLY_UNUSED = 1023;

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

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

static wuffs_base__status  //
wuffs_deflate__decoder__decode_blocks(wuffs_deflate__decoder* self,
                                      wuffs_base__io_writer a_dst,
                                      wuffs_base__io_reader a_src);

static wuffs_base__status  //
wuffs_deflate__decoder__decode_uncompressed(wuffs_deflate__decoder* self,
                                            wuffs_base__io_writer a_dst,
                                            wuffs_base__io_reader 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_reader 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_writer a_dst,
                                            wuffs_base__io_reader a_src);

static wuffs_base__status  //
wuffs_deflate__decoder__decode_huffman_slow(wuffs_deflate__decoder* self,
                                            wuffs_base__io_writer a_dst,
                                            wuffs_base__io_reader 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 {
    void* p = &(self->private_impl);
    size_t n = sizeof(self->private_impl);
    if ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      p = self;
      n = sizeof(*self);
      initialize_flags |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    }
    memset(p, 0, n);
  }

  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.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_writer a_dst,
                                         wuffs_base__io_reader 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 ((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;

  wuffs_base__status v_status = NULL;
  wuffs_base__slice_u8 v_written = {0};
  uint64_t v_n_copied = 0;
  uint32_t v_already_full = 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;
  if (a_dst.private_impl.buf) {
    iop_a_dst =
        a_dst.private_impl.buf->data.ptr + a_dst.private_impl.buf->meta.wi;
    if (!a_dst.private_impl.mark) {
      a_dst.private_impl.mark = iop_a_dst;
      a_dst.private_impl.limit =
          a_dst.private_impl.buf->data.ptr + a_dst.private_impl.buf->data.len;
    }
    if (a_dst.private_impl.buf->meta.closed) {
      a_dst.private_impl.limit = iop_a_dst;
    }
    io0_a_dst = a_dst.private_impl.mark;
    io1_a_dst = a_dst.private_impl.limit;
  }

  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) {
      wuffs_base__io_writer__set_mark(&a_dst, iop_a_dst);
      {
        if (a_dst.private_impl.buf) {
          a_dst.private_impl.buf->meta.wi =
              ((size_t)(iop_a_dst - a_dst.private_impl.buf->data.ptr));
        }
        wuffs_base__status t_0 =
            wuffs_deflate__decoder__decode_blocks(self, a_dst, a_src);
        if (a_dst.private_impl.buf) {
          iop_a_dst = a_dst.private_impl.buf->data.ptr +
                      a_dst.private_impl.buf->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;
      }
      v_written = wuffs_base__make_slice_u8(
          a_dst.private_impl.mark,
          (size_t)(iop_a_dst - a_dst.private_impl.mark));
      if (((uint64_t)(v_written.len)) >= 32768) {
        v_written = wuffs_base__slice_u8__suffix(v_written, 32768);
        wuffs_base__slice_u8__copy_from_slice(
            wuffs_base__make_slice_u8(self->private_data.f_history, 32768),
            v_written);
        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_written);
        if (v_n_copied < ((uint64_t)(v_written.len))) {
          v_written = wuffs_base__slice_u8__subslice_i(v_written, 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_written);
          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);
        }
      }
      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] = coro_susp_point;
  self->private_impl.active_coroutine = 1;

  goto exit;
exit:
  if (a_dst.private_impl.buf) {
    a_dst.private_impl.buf->meta.wi =
        ((size_t)(iop_a_dst - a_dst.private_impl.buf->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_writer a_dst,
                                      wuffs_base__io_reader 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;
  if (a_src.private_impl.buf) {
    iop_a_src =
        a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.ri;
    if (!a_src.private_impl.mark) {
      a_src.private_impl.mark = iop_a_src;
      a_src.private_impl.limit =
          a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.wi;
    }
    io0_a_src = a_src.private_impl.mark;
    io1_a_src = a_src.private_impl.limit;
  }

  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 == io1_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.private_impl.buf) {
          a_src.private_impl.buf->meta.ri =
              ((size_t)(iop_a_src - a_src.private_impl.buf->data.ptr));
        }
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
        status =
            wuffs_deflate__decoder__decode_uncompressed(self, a_dst, a_src);
        if (a_src.private_impl.buf) {
          iop_a_src = a_src.private_impl.buf->data.ptr +
                      a_src.private_impl.buf->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.private_impl.buf) {
          a_src.private_impl.buf->meta.ri =
              ((size_t)(iop_a_src - a_src.private_impl.buf->data.ptr));
        }
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
        status = wuffs_deflate__decoder__init_dynamic_huffman(self, a_src);
        if (a_src.private_impl.buf) {
          iop_a_src = a_src.private_impl.buf->data.ptr +
                      a_src.private_impl.buf->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.private_impl.buf) {
          a_src.private_impl.buf->meta.ri =
              ((size_t)(iop_a_src - a_src.private_impl.buf->data.ptr));
        }
        v_status =
            wuffs_deflate__decoder__decode_huffman_fast(self, a_dst, a_src);
        if (a_src.private_impl.buf) {
          iop_a_src = a_src.private_impl.buf->data.ptr +
                      a_src.private_impl.buf->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.private_impl.buf) {
          a_src.private_impl.buf->meta.ri =
              ((size_t)(iop_a_src - a_src.private_impl.buf->data.ptr));
        }
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
        status =
            wuffs_deflate__decoder__decode_huffman_slow(self, a_dst, a_src);
        if (a_src.private_impl.buf) {
          iop_a_src = a_src.private_impl.buf->data.ptr +
                      a_src.private_impl.buf->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] = coro_susp_point;
  self->private_data.s_decode_blocks[0].v_final = v_final;

  goto exit;
exit:
  if (a_src.private_impl.buf) {
    a_src.private_impl.buf->meta.ri =
        ((size_t)(iop_a_src - a_src.private_impl.buf->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_writer a_dst,
                                            wuffs_base__io_reader 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;
  if (a_dst.private_impl.buf) {
    iop_a_dst =
        a_dst.private_impl.buf->data.ptr + a_dst.private_impl.buf->meta.wi;
    if (!a_dst.private_impl.mark) {
      a_dst.private_impl.mark = iop_a_dst;
      a_dst.private_impl.limit =
          a_dst.private_impl.buf->data.ptr + a_dst.private_impl.buf->data.len;
    }
    if (a_dst.private_impl.buf->meta.closed) {
      a_dst.private_impl.limit = iop_a_dst;
    }
    io0_a_dst = a_dst.private_impl.mark;
    io1_a_dst = a_dst.private_impl.limit;
  }
  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;
  if (a_src.private_impl.buf) {
    iop_a_src =
        a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.ri;
    if (!a_src.private_impl.mark) {
      a_src.private_impl.mark = iop_a_src;
      a_src.private_impl.limit =
          a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.wi;
    }
    io0_a_src = a_src.private_impl.mark;
    io1_a_src = a_src.private_impl.limit;
  }

  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(io1_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 == io1_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, io1_a_dst, v_length, &iop_a_src, io1_a_src);
      if (v_length <= v_n_copied) {
        status = NULL;
        goto ok;
      }
      v_length -= v_n_copied;
      if (((uint64_t)(io1_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] = coro_susp_point;
  self->private_data.s_decode_uncompressed[0].v_length = v_length;

  goto exit;
exit:
  if (a_dst.private_impl.buf) {
    a_dst.private_impl.buf->meta.wi =
        ((size_t)(iop_a_dst - a_dst.private_impl.buf->data.ptr));
  }
  if (a_src.private_impl.buf) {
    a_src.private_impl.buf->meta.ri =
        ((size_t)(iop_a_src - a_src.private_impl.buf->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_reader 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;
  if (a_src.private_impl.buf) {
    iop_a_src =
        a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.ri;
    if (!a_src.private_impl.mark) {
      a_src.private_impl.mark = iop_a_src;
      a_src.private_impl.limit =
          a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.wi;
    }
    io0_a_src = a_src.private_impl.mark;
    io1_a_src = a_src.private_impl.limit;
  }

  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 == io1_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 == io1_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 == io1_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 == io1_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] = coro_susp_point;
  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.private_impl.buf) {
    a_src.private_impl.buf->meta.ri =
        ((size_t)(iop_a_src - a_src.private_impl.buf->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) {
    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_writer a_dst,
                                            wuffs_base__io_reader 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;
  if (a_dst.private_impl.buf) {
    iop_a_dst =
        a_dst.private_impl.buf->data.ptr + a_dst.private_impl.buf->meta.wi;
    if (!a_dst.private_impl.mark) {
      a_dst.private_impl.mark = iop_a_dst;
      a_dst.private_impl.limit =
          a_dst.private_impl.buf->data.ptr + a_dst.private_impl.buf->data.len;
    }
    if (a_dst.private_impl.buf->meta.closed) {
      a_dst.private_impl.limit = iop_a_dst;
    }
    io0_a_dst = a_dst.private_impl.mark;
    io1_a_dst = a_dst.private_impl.limit;
  }
  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;
  if (a_src.private_impl.buf) {
    iop_a_src =
        a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.ri;
    if (!a_src.private_impl.mark) {
      a_src.private_impl.mark = iop_a_src;
      a_src.private_impl.limit =
          a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.wi;
    }
    io0_a_src = a_src.private_impl.mark;
    io1_a_src = a_src.private_impl.limit;
  }

  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)(io1_a_dst - iop_a_dst)) >= 258) &&
         (((uint64_t)(io1_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 - a_dst.private_impl.mark))) {
        v_hlen = 0;
        v_hdist =
            ((uint32_t)((((uint64_t)((v_dist_minus_1 + 1))) -
                         ((uint64_t)(iop_a_dst - a_dst.private_impl.mark)))));
        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, io1_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, io1_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 - a_dst.private_impl.mark))) {
          status = wuffs_deflate__error__internal_error_inconsistent_distance;
          goto exit;
        }
      }
      wuffs_base__io_writer__copy_n_from_history_fast(
          &iop_a_dst, a_dst.private_impl.mark, io1_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 > io0_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.private_impl.buf) {
    a_dst.private_impl.buf->meta.wi =
        ((size_t)(iop_a_dst - a_dst.private_impl.buf->data.ptr));
  }
  if (a_src.private_impl.buf) {
    a_src.private_impl.buf->meta.ri =
        ((size_t)(iop_a_src - a_src.private_impl.buf->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_writer a_dst,
                                            wuffs_base__io_reader 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;
  if (a_dst.private_impl.buf) {
    iop_a_dst =
        a_dst.private_impl.buf->data.ptr + a_dst.private_impl.buf->meta.wi;
    if (!a_dst.private_impl.mark) {
      a_dst.private_impl.mark = iop_a_dst;
      a_dst.private_impl.limit =
          a_dst.private_impl.buf->data.ptr + a_dst.private_impl.buf->data.len;
    }
    if (a_dst.private_impl.buf->meta.closed) {
      a_dst.private_impl.limit = iop_a_dst;
    }
    io0_a_dst = a_dst.private_impl.mark;
    io1_a_dst = a_dst.private_impl.limit;
  }
  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;
  if (a_src.private_impl.buf) {
    iop_a_src =
        a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.ri;
    if (!a_src.private_impl.mark) {
      a_src.private_impl.mark = iop_a_src;
      a_src.private_impl.limit =
          a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.wi;
    }
    io0_a_src = a_src.private_impl.mark;
    io1_a_src = a_src.private_impl.limit;
  }

  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 == io1_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 == io1_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 == io1_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 == io1_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 == io1_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 == io1_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 == io1_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 == io1_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 - a_dst.private_impl.mark))) {
          v_hdist =
              ((uint32_t)((((uint64_t)((v_dist_minus_1 + 1))) -
                           ((uint64_t)(iop_a_dst - a_dst.private_impl.mark)))));
          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, io1_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, io1_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, a_dst.private_impl.mark, io1_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] = coro_susp_point;
  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.private_impl.buf) {
    a_dst.private_impl.buf->meta.wi =
        ((size_t)(iop_a_dst - a_dst.private_impl.buf->data.ptr));
  }
  if (a_src.private_impl.buf) {
    a_src.private_impl.buf->meta.ri =
        ((size_t)(iop_a_src - a_src.private_impl.buf->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_reader a_src);

static wuffs_base__status  //
wuffs_lzw__decoder__write_to(wuffs_lzw__decoder* self,
                             wuffs_base__io_writer 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 {
    void* p = &(self->private_impl);
    size_t n = sizeof(self->private_impl);
    if ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      p = self;
      n = sizeof(*self);
      initialize_flags |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    }
    memset(p, 0, n);
  }

  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 < 2 || 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;
  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_writer a_dst,
                                     wuffs_base__io_reader 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 ((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 >= 2) {
      self->private_impl.f_literal_width =
          self->private_impl.f_set_literal_width_arg;
    }
    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] = coro_susp_point;
  self->private_impl.active_coroutine = 1;

  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_reader 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;
  if (a_src.private_impl.buf) {
    iop_a_src =
        a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.ri;
    if (!a_src.private_impl.mark) {
      a_src.private_impl.mark = iop_a_src;
      a_src.private_impl.limit =
          a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.wi;
    }
    io0_a_src = a_src.private_impl.mark;
    io1_a_src = a_src.private_impl.limit;
  }

  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)(io1_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)(io1_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)(io1_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 > io0_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.private_impl.buf) {
    a_src.private_impl.buf->meta.ri =
        ((size_t)(iop_a_src - a_src.private_impl.buf->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_writer 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;
  if (a_dst.private_impl.buf) {
    iop_a_dst =
        a_dst.private_impl.buf->data.ptr + a_dst.private_impl.buf->meta.wi;
    if (!a_dst.private_impl.mark) {
      a_dst.private_impl.mark = iop_a_dst;
      a_dst.private_impl.limit =
          a_dst.private_impl.buf->data.ptr + a_dst.private_impl.buf->data.len;
    }
    if (a_dst.private_impl.buf->meta.closed) {
      a_dst.private_impl.limit = iop_a_dst;
    }
    io0_a_dst = a_dst.private_impl.mark;
    io1_a_dst = a_dst.private_impl.limit;
  }

  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, io1_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] = coro_susp_point;

  goto exit;
exit:
  if (a_dst.private_impl.buf) {
    a_dst.private_impl.buf->meta.wi =
        ((size_t)(iop_a_dst - a_dst.private_impl.buf->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_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__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__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,
};

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

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

static wuffs_base__status  //
wuffs_gif__decoder__skip_frame(wuffs_gif__decoder* self,
                               wuffs_base__io_reader 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_reader a_src);

static wuffs_base__status  //
wuffs_gif__decoder__decode_header(wuffs_gif__decoder* self,
                                  wuffs_base__io_reader a_src);

static wuffs_base__status  //
wuffs_gif__decoder__decode_lsd(wuffs_gif__decoder* self,
                               wuffs_base__io_reader a_src);

static wuffs_base__status  //
wuffs_gif__decoder__decode_extension(wuffs_gif__decoder* self,
                                     wuffs_base__io_reader a_src);

static wuffs_base__status  //
wuffs_gif__decoder__skip_blocks(wuffs_gif__decoder* self,
                                wuffs_base__io_reader a_src);

static wuffs_base__status  //
wuffs_gif__decoder__decode_ae(wuffs_gif__decoder* self,
                              wuffs_base__io_reader a_src);

static wuffs_base__status  //
wuffs_gif__decoder__decode_gc(wuffs_gif__decoder* self,
                              wuffs_base__io_reader a_src);

static wuffs_base__status  //
wuffs_gif__decoder__decode_id_part0(wuffs_gif__decoder* self,
                                    wuffs_base__io_reader 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_reader 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_reader 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 {
    void* p = &(self->private_impl);
    size_t n = sizeof(self->private_impl);
    if ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      p = self;
      n = sizeof(*self);
      initialize_flags |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    }
    memset(p, 0, n);
  }

  {
    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.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_reader 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 ((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 >= 1) {
      status = wuffs_base__error__bad_call_sequence;
      goto exit;
    }
    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;
    }
    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 &&
         (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));
    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 = 1;

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

  goto suspend;
suspend:
  self->private_impl.p_decode_image_config[0] = coro_susp_point;
  self->private_impl.active_coroutine = 1;

  goto exit;
exit:
  if (wuffs_base__status__is_error(status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func gif.decoder.num_animation_loops

WUFFS_BASE__MAYBE_STATIC uint32_t  //
wuffs_gif__decoder__num_animation_loops(const wuffs_gif__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  if (self->private_impl.f_seen_num_loops) {
    return self->private_impl.f_num_loops;
  }
  return 1;
}

// -------- func gif.decoder.num_decoded_frame_configs

WUFFS_BASE__MAYBE_STATIC uint64_t  //
wuffs_gif__decoder__num_decoded_frame_configs(const wuffs_gif__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  return self->private_impl.f_num_decoded_frame_configs_value;
}

// -------- func gif.decoder.num_decoded_frames

WUFFS_BASE__MAYBE_STATIC uint64_t  //
wuffs_gif__decoder__num_decoded_frames(const wuffs_gif__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  return self->private_impl.f_num_decoded_frames_value;
}

// -------- func gif.decoder.frame_dirty_rect

WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32  //
wuffs_gif__decoder__frame_dirty_rect(const wuffs_gif__decoder* self) {
  if (!self) {
    return wuffs_base__utility__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__range_ie_u32__get_min_incl(&self->private_impl.f_dirty_y),
      wuffs_base__u32__min(self->private_impl.f_frame_rect_x1,
                           self->private_impl.f_width),
      wuffs_base__range_ie_u32__get_max_excl(&self->private_impl.f_dirty_y));
}

// -------- 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_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_reader 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 ((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 v_blend = 0;

  uint32_t coro_susp_point = self->private_impl.p_decode_frame_config[0];
  if (coro_susp_point) {
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    (memset(&self->private_impl.f_dirty_y, 0, sizeof(wuffs_base__range_ie_u32)),
     wuffs_base__make_empty_struct());
    if (!self->private_impl.f_end_of_data) {
      if (self->private_impl.f_call_sequence == 0) {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
        status = wuffs_gif__decoder__decode_image_config(self, NULL, a_src);
        if (status) {
          goto suspend;
        }
      } else if (self->private_impl.f_call_sequence != 1) {
        if (self->private_impl.f_call_sequence == 2) {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
          status = wuffs_gif__decoder__skip_frame(self, a_src);
          if (status) {
            goto suspend;
          }
        }
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
        status = wuffs_gif__decoder__decode_up_to_id_part1(self, a_src);
        if (status) {
          goto suspend;
        }
      }
    }
    if (self->private_impl.f_end_of_data) {
      status = wuffs_base__warning__end_of_data;
      goto ok;
    }
    v_blend = 0;
    if (!self->private_impl.f_gc_has_transparent_index) {
      v_blend = 2;
    }
    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);
    }
    wuffs_base__u64__sat_add_indirect(
        &self->private_impl.f_num_decoded_frame_configs_value, 1);
    self->private_impl.f_call_sequence = 2;

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

  goto suspend;
suspend:
  self->private_impl.p_decode_frame_config[0] = coro_susp_point;
  self->private_impl.active_coroutine = 2;

  goto exit;
exit:
  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_reader a_src) {
  wuffs_base__status status = NULL;

  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;
  if (a_src.private_impl.buf) {
    iop_a_src =
        a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.ri;
    if (!a_src.private_impl.mark) {
      a_src.private_impl.mark = iop_a_src;
      a_src.private_impl.limit =
          a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.wi;
    }
    io0_a_src = a_src.private_impl.mark;
    io1_a_src = a_src.private_impl.limit;
  }

  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 == io1_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)(io1_a_src - iop_a_src))) {
        self->private_data.s_skip_frame[0].scratch -=
            ((uint64_t)(io1_a_src - iop_a_src));
        iop_a_src = io1_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 == io1_a_src)) {
      status = wuffs_base__suspension__short_read;
      goto suspend;
    }
    iop_a_src++;
    if (a_src.private_impl.buf) {
      a_src.private_impl.buf->meta.ri =
          ((size_t)(iop_a_src - a_src.private_impl.buf->data.ptr));
    }
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
    status = wuffs_gif__decoder__skip_blocks(self, a_src);
    if (a_src.private_impl.buf) {
      iop_a_src =
          a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.ri;
    }
    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_skip_frame[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_skip_frame[0] = coro_susp_point;

  goto exit;
exit:
  if (a_src.private_impl.buf) {
    a_src.private_impl.buf->meta.ri =
        ((size_t)(iop_a_src - a_src.private_impl.buf->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_reader 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) {
    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;

  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;

    if (self->private_impl.f_call_sequence != 2) {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      status = wuffs_gif__decoder__decode_frame_config(self, NULL, a_src);
      if (status) {
        goto suspend;
      }
    }
    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] = coro_susp_point;
  self->private_impl.active_coroutine = 3;

  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 = 3;
  self->private_impl.f_seen_graphic_control = false;
  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_reader 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;
  if (a_src.private_impl.buf) {
    iop_a_src =
        a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.ri;
    if (!a_src.private_impl.mark) {
      a_src.private_impl.mark = iop_a_src;
      a_src.private_impl.limit =
          a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.wi;
    }
    io0_a_src = a_src.private_impl.mark;
    io1_a_src = a_src.private_impl.limit;
  }

  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) {
      self->private_impl.f_frame_config_io_position =
          (a_src.private_impl.buf
               ? wuffs_base__u64__sat_add(
                     a_src.private_impl.buf->meta.pos,
                     ((uint64_t)(iop_a_src - a_src.private_impl.buf->data.ptr)))
               : 0);
    } else if (self->private_impl.f_frame_config_io_position !=
               (a_src.private_impl.buf
                    ? wuffs_base__u64__sat_add(
                          a_src.private_impl.buf->meta.pos,
                          ((uint64_t)(iop_a_src -
                                      a_src.private_impl.buf->data.ptr)))
                    : 0)) {
      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 == io1_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.private_impl.buf) {
          a_src.private_impl.buf->meta.ri =
              ((size_t)(iop_a_src - a_src.private_impl.buf->data.ptr));
        }
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
        status = wuffs_gif__decoder__decode_extension(self, a_src);
        if (a_src.private_impl.buf) {
          iop_a_src = a_src.private_impl.buf->data.ptr +
                      a_src.private_impl.buf->meta.ri;
        }
        if (status) {
          goto suspend;
        }
      } else if (v_block_type == 44) {
        if (a_src.private_impl.buf) {
          a_src.private_impl.buf->meta.ri =
              ((size_t)(iop_a_src - a_src.private_impl.buf->data.ptr));
        }
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
        status = wuffs_gif__decoder__decode_id_part0(self, a_src);
        if (a_src.private_impl.buf) {
          iop_a_src = a_src.private_impl.buf->data.ptr +
                      a_src.private_impl.buf->meta.ri;
        }
        if (status) {
          goto suspend;
        }
        goto label_0_break;
      } else if (v_block_type == 59) {
        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] = coro_susp_point;

  goto exit;
exit:
  if (a_src.private_impl.buf) {
    a_src.private_impl.buf->meta.ri =
        ((size_t)(iop_a_src - a_src.private_impl.buf->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_reader 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;
  if (a_src.private_impl.buf) {
    iop_a_src =
        a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.ri;
    if (!a_src.private_impl.mark) {
      a_src.private_impl.mark = iop_a_src;
      a_src.private_impl.limit =
          a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.wi;
    }
    io0_a_src = a_src.private_impl.mark;
    io1_a_src = a_src.private_impl.limit;
  }

  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 == io1_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] = coro_susp_point;
  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.private_impl.buf) {
    a_src.private_impl.buf->meta.ri =
        ((size_t)(iop_a_src - a_src.private_impl.buf->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_reader a_src) {
  wuffs_base__status status = NULL;

  uint8_t v_flags = 0;
  uint32_t v_num_palette_entries = 0;
  uint32_t v_i = 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;
  if (a_src.private_impl.buf) {
    iop_a_src =
        a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.ri;
    if (!a_src.private_impl.mark) {
      a_src.private_impl.mark = iop_a_src;
      a_src.private_impl.limit =
          a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.wi;
    }
    io0_a_src = a_src.private_impl.mark;
    io1_a_src = a_src.private_impl.limit;
  }

  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_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(io1_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 == io1_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(io1_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 == io1_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 == io1_a_src)) {
        status = wuffs_base__suspension__short_read;
        goto suspend;
      }
      uint8_t t_2 = *iop_a_src++;
      v_flags = t_2;
    }
    self->private_data.s_decode_lsd[0].scratch = 2;
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
    if (self->private_data.s_decode_lsd[0].scratch >
        ((uint64_t)(io1_a_src - iop_a_src))) {
      self->private_data.s_decode_lsd[0].scratch -=
          ((uint64_t)(io1_a_src - iop_a_src));
      iop_a_src = io1_a_src;
      status = wuffs_base__suspension__short_read;
      goto suspend;
    }
    iop_a_src += self->private_data.s_decode_lsd[0].scratch;
    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(7);
          uint32_t t_3;
          if (WUFFS_BASE__LIKELY(io1_a_src - iop_a_src >= 3)) {
            t_3 = ((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(8);
            while (true) {
              if (WUFFS_BASE__UNLIKELY(iop_a_src == io1_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_3 = ((uint32_t)(*scratch & 0xFF));
              *scratch >>= 8;
              *scratch <<= 8;
              *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_3);
              if (num_bits_3 == 16) {
                t_3 = ((uint32_t)(*scratch >> 40));
                break;
              }
              num_bits_3 += 8;
              *scratch |= ((uint64_t)(num_bits_3));
            }
          }
          v_argb = t_3;
        }
        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;
      }
      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] = coro_susp_point;
  self->private_data.s_decode_lsd[0].v_flags = v_flags;
  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.private_impl.buf) {
    a_src.private_impl.buf->meta.ri =
        ((size_t)(iop_a_src - a_src.private_impl.buf->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_reader 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;
  if (a_src.private_impl.buf) {
    iop_a_src =
        a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.ri;
    if (!a_src.private_impl.mark) {
      a_src.private_impl.mark = iop_a_src;
      a_src.private_impl.limit =
          a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.wi;
    }
    io0_a_src = a_src.private_impl.mark;
    io1_a_src = a_src.private_impl.limit;
  }

  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 == io1_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.private_impl.buf) {
        a_src.private_impl.buf->meta.ri =
            ((size_t)(iop_a_src - a_src.private_impl.buf->data.ptr));
      }
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
      status = wuffs_gif__decoder__decode_gc(self, a_src);
      if (a_src.private_impl.buf) {
        iop_a_src =
            a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.ri;
      }
      if (status) {
        goto suspend;
      }
      status = NULL;
      goto ok;
    } else if (v_label == 255) {
      if (a_src.private_impl.buf) {
        a_src.private_impl.buf->meta.ri =
            ((size_t)(iop_a_src - a_src.private_impl.buf->data.ptr));
      }
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
      status = wuffs_gif__decoder__decode_ae(self, a_src);
      if (a_src.private_impl.buf) {
        iop_a_src =
            a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.ri;
      }
      if (status) {
        goto suspend;
      }
      status = NULL;
      goto ok;
    }
    if (a_src.private_impl.buf) {
      a_src.private_impl.buf->meta.ri =
          ((size_t)(iop_a_src - a_src.private_impl.buf->data.ptr));
    }
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
    status = wuffs_gif__decoder__skip_blocks(self, a_src);
    if (a_src.private_impl.buf) {
      iop_a_src =
          a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->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] = coro_susp_point;

  goto exit;
exit:
  if (a_src.private_impl.buf) {
    a_src.private_impl.buf->meta.ri =
        ((size_t)(iop_a_src - a_src.private_impl.buf->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_reader 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;
  if (a_src.private_impl.buf) {
    iop_a_src =
        a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.ri;
    if (!a_src.private_impl.mark) {
      a_src.private_impl.mark = iop_a_src;
      a_src.private_impl.limit =
          a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.wi;
    }
    io0_a_src = a_src.private_impl.mark;
    io1_a_src = a_src.private_impl.limit;
  }

  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 == io1_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)(io1_a_src - iop_a_src))) {
        self->private_data.s_skip_blocks[0].scratch -=
            ((uint64_t)(io1_a_src - iop_a_src));
        iop_a_src = io1_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] = coro_susp_point;

  goto exit;
exit:
  if (a_src.private_impl.buf) {
    a_src.private_impl.buf->meta.ri =
        ((size_t)(iop_a_src - a_src.private_impl.buf->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_reader a_src) {
  wuffs_base__status status = NULL;

  uint8_t v_c = 0;
  uint8_t v_block_size = 0;
  bool v_not_animexts = false;
  bool v_not_netscape = 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;
  if (a_src.private_impl.buf) {
    iop_a_src =
        a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.ri;
    if (!a_src.private_impl.mark) {
      a_src.private_impl.mark = iop_a_src;
      a_src.private_impl.limit =
          a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.wi;
    }
    io0_a_src = a_src.private_impl.mark;
    io1_a_src = a_src.private_impl.limit;
  }

  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_not_animexts = self->private_data.s_decode_ae[0].v_not_animexts;
    v_not_netscape = self->private_data.s_decode_ae[0].v_not_netscape;
  }
  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 == io1_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)(io1_a_src - iop_a_src))) {
          self->private_data.s_decode_ae[0].scratch -=
              ((uint64_t)(io1_a_src - iop_a_src));
          iop_a_src = io1_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_not_animexts = false;
      v_not_netscape = false;
      v_block_size = 0;
      while (v_block_size < 11) {
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io1_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint8_t t_1 = *iop_a_src++;
          v_c = t_1;
        }
        v_not_animexts =
            (v_not_animexts || (v_c != wuffs_gif__animexts1dot0[v_block_size]));
        v_not_netscape =
            (v_not_netscape || (v_c != wuffs_gif__netscape2dot0[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_not_animexts && v_not_netscape) {
        goto label_0_break;
      }
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
        if (WUFFS_BASE__UNLIKELY(iop_a_src == io1_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)(io1_a_src - iop_a_src))) {
          self->private_data.s_decode_ae[0].scratch -=
              ((uint64_t)(io1_a_src - iop_a_src));
          iop_a_src = io1_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 == io1_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)(io1_a_src - iop_a_src))) {
          self->private_data.s_decode_ae[0].scratch -=
              ((uint64_t)(io1_a_src - iop_a_src));
          iop_a_src = io1_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(io1_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 == io1_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;
      }
      goto label_0_break;
    }
  label_0_break:;
    if (a_src.private_impl.buf) {
      a_src.private_impl.buf->meta.ri =
          ((size_t)(iop_a_src - a_src.private_impl.buf->data.ptr));
    }
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(10);
    status = wuffs_gif__decoder__skip_blocks(self, a_src);
    if (a_src.private_impl.buf) {
      iop_a_src =
          a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->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] = coro_susp_point;
  self->private_data.s_decode_ae[0].v_block_size = v_block_size;
  self->private_data.s_decode_ae[0].v_not_animexts = v_not_animexts;
  self->private_data.s_decode_ae[0].v_not_netscape = v_not_netscape;

  goto exit;
exit:
  if (a_src.private_impl.buf) {
    a_src.private_impl.buf->meta.ri =
        ((size_t)(iop_a_src - a_src.private_impl.buf->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_reader 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;
  if (a_src.private_impl.buf) {
    iop_a_src =
        a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.ri;
    if (!a_src.private_impl.mark) {
      a_src.private_impl.mark = iop_a_src;
      a_src.private_impl.limit =
          a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.wi;
    }
    io0_a_src = a_src.private_impl.mark;
    io1_a_src = a_src.private_impl.limit;
  }

  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;

    if (self->private_impl.f_seen_graphic_control) {
      status = wuffs_gif__error__bad_graphic_control;
      goto exit;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io1_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 == io1_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(io1_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 == io1_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 == io1_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 == io1_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;
    }
    self->private_impl.f_seen_graphic_control = true;

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

  goto suspend;
suspend:
  self->private_impl.p_decode_gc[0] = coro_susp_point;

  goto exit;
exit:
  if (a_src.private_impl.buf) {
    a_src.private_impl.buf->meta.ri =
        ((size_t)(iop_a_src - a_src.private_impl.buf->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_reader 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;
  if (a_src.private_impl.buf) {
    iop_a_src =
        a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.ri;
    if (!a_src.private_impl.mark) {
      a_src.private_impl.mark = iop_a_src;
      a_src.private_impl.limit =
          a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.wi;
    }
    io0_a_src = a_src.private_impl.mark;
    io1_a_src = a_src.private_impl.limit;
  }

  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(io1_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 == io1_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(io1_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 == io1_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(io1_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 == io1_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(io1_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 == io1_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_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] = coro_susp_point;

  goto exit;
exit:
  if (a_src.private_impl.buf) {
    a_src.private_impl.buf->meta.ri =
        ((size_t)(iop_a_src - a_src.private_impl.buf->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_reader a_src) {
  wuffs_base__status status = NULL;

  uint8_t v_flags = 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};
  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;
  if (a_src.private_impl.buf) {
    iop_a_src =
        a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.ri;
    if (!a_src.private_impl.mark) {
      a_src.private_impl.mark = iop_a_src;
      a_src.private_impl.limit =
          a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.wi;
    }
    io0_a_src = a_src.private_impl.mark;
    io1_a_src = a_src.private_impl.limit;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_id_part1[0];
  if (coro_susp_point) {
    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 == io1_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;
    }
    self->private_impl.f_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(io1_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 == io1_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_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 {
      self->private_impl.f_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);
    }
    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[self->private_impl.f_which_palette],
            1024));
    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 == io1_a_src)) {
        status = wuffs_base__suspension__short_read;
        goto suspend;
      }
      uint8_t t_2 = *iop_a_src++;
      v_lw = t_2;
    }
    if ((v_lw < 2) || (8 < v_lw)) {
      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] = coro_susp_point;
  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.private_impl.buf) {
    a_src.private_impl.buf->meta.ri =
        ((size_t)(iop_a_src - a_src.private_impl.buf->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_reader 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_reader v_r = wuffs_base__null_io_reader();
  wuffs_base__io_buffer u_r WUFFS_BASE__POTENTIALLY_UNUSED =
      wuffs_base__null_io_buffer();
  uint8_t* iop_v_r WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_v_r WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  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;
  if (a_src.private_impl.buf) {
    iop_a_src =
        a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.ri;
    if (!a_src.private_impl.mark) {
      a_src.private_impl.mark = iop_a_src;
      a_src.private_impl.limit =
          a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.wi;
    }
    io0_a_src = a_src.private_impl.mark;
    io1_a_src = a_src.private_impl.limit;
  }

  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 == io1_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)(io1_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)(io1_a_src - iop_a_src)));
        if (v_n_compressed <= 0) {
          goto label_1_break;
        }
        v_compressed =
            wuffs_base__io_reader__take(&iop_a_src, io1_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)(io1_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_reader o_0_v_r = v_r;
          uint8_t* o_0_iop_v_r = iop_v_r;
          uint8_t* o_0_io1_v_r = io1_v_r;
          wuffs_base__io_reader__set(
              &v_r, &u_r, &iop_v_r, &io1_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));
          {
            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,
                wuffs_base__utility__null_io_writer(), v_r,
                wuffs_base__utility__null_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,
              ((uint64_t)(iop_v_r - v_r.private_impl.mark)));
          v_r = o_0_v_r;
          iop_v_r = o_0_iop_v_r;
          io1_v_r = o_0_io1_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)(io1_a_src - iop_a_src))) {
              self->private_data.s_decode_id_part2[0].scratch -=
                  ((uint64_t)(io1_a_src - iop_a_src));
              iop_a_src = io1_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.private_impl.buf) {
              a_src.private_impl.buf->meta.ri =
                  ((size_t)(iop_a_src - a_src.private_impl.buf->data.ptr));
            }
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
            status = wuffs_gif__decoder__skip_blocks(self, a_src);
            if (a_src.private_impl.buf) {
              iop_a_src = a_src.private_impl.buf->data.ptr +
                          a_src.private_impl.buf->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] = coro_susp_point;
  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.private_impl.buf) {
    a_src.private_impl.buf->meta.ri =
        ((size_t)(iop_a_src - a_src.private_impl.buf->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_n = 0;
  uint64_t v_src_ri = 0;
  uint32_t v_bytes_per_pixel = 0;
  uint32_t v_pixfmt = 0;
  wuffs_base__table_u8 v_tab = {0};
  uint64_t v_i = 0;
  uint64_t v_j = 0;

  v_bytes_per_pixel = 1;
  v_pixfmt = wuffs_base__pixel_buffer__pixel_format(a_pb);
  if ((v_pixfmt == 1157662856) || (v_pixfmt == 1426098312) ||
      (v_pixfmt == 1174440072) || (v_pixfmt == 1442875528) ||
      (v_pixfmt == 1191217288) || (v_pixfmt == 1459652744)) {
    v_bytes_per_pixel = 4;
  }
  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) {
      return wuffs_base__error__too_much_data;
    }
    v_dst = wuffs_base__table_u8__row(v_tab, self->private_impl.f_dst_y);
    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_packed(
          &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_y = wuffs_base__range_ie_u32__unite(
          &self->private_impl.f_dirty_y,
          wuffs_base__utility__make_range_ie_u32(
              self->private_impl.f_dst_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;
      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 {
    void* p = &(self->private_impl);
    size_t n = sizeof(self->private_impl);
    if ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      p = self;
      n = sizeof(*self);
      initialize_flags |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    }
    memset(p, 0, n);
  }

  {
    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_writer a_dst,
                                      wuffs_base__io_reader 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 ((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;
  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;
  if (a_dst.private_impl.buf) {
    iop_a_dst =
        a_dst.private_impl.buf->data.ptr + a_dst.private_impl.buf->meta.wi;
    if (!a_dst.private_impl.mark) {
      a_dst.private_impl.mark = iop_a_dst;
      a_dst.private_impl.limit =
          a_dst.private_impl.buf->data.ptr + a_dst.private_impl.buf->data.len;
    }
    if (a_dst.private_impl.buf->meta.closed) {
      a_dst.private_impl.limit = iop_a_dst;
    }
    io0_a_dst = a_dst.private_impl.mark;
    io1_a_dst = a_dst.private_impl.limit;
  }
  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;
  if (a_src.private_impl.buf) {
    iop_a_src =
        a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.ri;
    if (!a_src.private_impl.mark) {
      a_src.private_impl.mark = iop_a_src;
      a_src.private_impl.limit =
          a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.wi;
    }
    io0_a_src = a_src.private_impl.mark;
    io1_a_src = a_src.private_impl.limit;
  }

  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 == io1_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 == io1_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 == io1_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 == io1_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)(io1_a_src - iop_a_src))) {
      self->private_data.s_decode_io_writer[0].scratch -=
          ((uint64_t)(io1_a_src - iop_a_src));
      iop_a_src = io1_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(io1_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 == io1_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)(io1_a_src - iop_a_src))) {
        self->private_data.s_decode_io_writer[0].scratch -=
            ((uint64_t)(io1_a_src - iop_a_src));
        iop_a_src = io1_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 == io1_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 == io1_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)(io1_a_src - iop_a_src))) {
        self->private_data.s_decode_io_writer[0].scratch -=
            ((uint64_t)(io1_a_src - iop_a_src));
        iop_a_src = io1_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) {
      wuffs_base__io_writer__set_mark(&a_dst, iop_a_dst);
      {
        if (a_dst.private_impl.buf) {
          a_dst.private_impl.buf->meta.wi =
              ((size_t)(iop_a_dst - a_dst.private_impl.buf->data.ptr));
        }
        if (a_src.private_impl.buf) {
          a_src.private_impl.buf->meta.ri =
              ((size_t)(iop_a_src - a_src.private_impl.buf->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.private_impl.buf) {
          iop_a_dst = a_dst.private_impl.buf->data.ptr +
                      a_dst.private_impl.buf->meta.wi;
        }
        if (a_src.private_impl.buf) {
          iop_a_src = a_src.private_impl.buf->data.ptr +
                      a_src.private_impl.buf->meta.ri;
        }
        v_status = t_7;
      }
      if (!self->private_impl.f_ignore_checksum) {
        v_checksum_got = wuffs_crc32__ieee_hasher__update(
            &self->private_data.f_checksum,
            wuffs_base__make_slice_u8(
                a_dst.private_impl.mark,
                (size_t)(iop_a_dst - a_dst.private_impl.mark)));
        v_decoded_length_got += ((uint32_t)(
            (((uint64_t)(iop_a_dst - a_dst.private_impl.mark)) & 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(io1_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 == io1_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(io1_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 == io1_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] = coro_susp_point;
  self->private_impl.active_coroutine = 1;
  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.private_impl.buf) {
    a_dst.private_impl.buf->meta.wi =
        ((size_t)(iop_a_dst - a_dst.private_impl.buf->data.ptr));
  }
  if (a_src.private_impl.buf) {
    a_src.private_impl.buf->meta.ri =
        ((size_t)(iop_a_src - a_src.private_impl.buf->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__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__todo_unsupported_preset_dictionary =
    "#zlib: TODO: unsupported preset 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 {
    void* p = &(self->private_impl);
    size_t n = sizeof(self->private_impl);
    if ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      p = self;
      n = sizeof(*self);
      initialize_flags |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    }
    memset(p, 0, n);
  }

  {
    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_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.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_writer a_dst,
                                      wuffs_base__io_reader 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 ((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;

  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;
  if (a_dst.private_impl.buf) {
    iop_a_dst =
        a_dst.private_impl.buf->data.ptr + a_dst.private_impl.buf->meta.wi;
    if (!a_dst.private_impl.mark) {
      a_dst.private_impl.mark = iop_a_dst;
      a_dst.private_impl.limit =
          a_dst.private_impl.buf->data.ptr + a_dst.private_impl.buf->data.len;
    }
    if (a_dst.private_impl.buf->meta.closed) {
      a_dst.private_impl.limit = iop_a_dst;
    }
    io0_a_dst = a_dst.private_impl.mark;
    io1_a_dst = a_dst.private_impl.limit;
  }
  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;
  if (a_src.private_impl.buf) {
    iop_a_src =
        a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.ri;
    if (!a_src.private_impl.mark) {
      a_src.private_impl.mark = iop_a_src;
      a_src.private_impl.limit =
          a_src.private_impl.buf->data.ptr + a_src.private_impl.buf->meta.wi;
    }
    io0_a_src = a_src.private_impl.mark;
    io1_a_src = a_src.private_impl.limit;
  }

  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;

    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      uint16_t t_0;
      if (WUFFS_BASE__LIKELY(io1_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 == io1_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 & 32) != 0) {
      status = wuffs_zlib__error__todo_unsupported_preset_dictionary;
      goto exit;
    }
    if ((v_x % 31) != 0) {
      status = wuffs_zlib__error__bad_parity_check;
      goto exit;
    }
    while (true) {
      wuffs_base__io_writer__set_mark(&a_dst, iop_a_dst);
      {
        if (a_dst.private_impl.buf) {
          a_dst.private_impl.buf->meta.wi =
              ((size_t)(iop_a_dst - a_dst.private_impl.buf->data.ptr));
        }
        if (a_src.private_impl.buf) {
          a_src.private_impl.buf->meta.ri =
              ((size_t)(iop_a_src - a_src.private_impl.buf->data.ptr));
        }
        wuffs_base__status t_1 = wuffs_deflate__decoder__decode_io_writer(
            &self->private_data.f_flate, a_dst, a_src, a_workbuf);
        if (a_dst.private_impl.buf) {
          iop_a_dst = a_dst.private_impl.buf->data.ptr +
                      a_dst.private_impl.buf->meta.wi;
        }
        if (a_src.private_impl.buf) {
          iop_a_src = a_src.private_impl.buf->data.ptr +
                      a_src.private_impl.buf->meta.ri;
        }
        v_status = t_1;
      }
      if (!self->private_impl.f_ignore_checksum) {
        v_checksum_got = wuffs_adler32__hasher__update(
            &self->private_data.f_checksum,
            wuffs_base__make_slice_u8(
                a_dst.private_impl.mark,
                (size_t)(iop_a_dst - a_dst.private_impl.mark)));
      }
      if (wuffs_base__status__is_ok(v_status)) {
        goto label_0_break;
      }
      status = v_status;
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(3);
    }
  label_0_break:;
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
      uint32_t t_2;
      if (WUFFS_BASE__LIKELY(io1_a_src - iop_a_src >= 4)) {
        t_2 = 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(5);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io1_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_2 = ((uint32_t)(*scratch & 0xFF));
          *scratch >>= 8;
          *scratch <<= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_2);
          if (num_bits_2 == 24) {
            t_2 = ((uint32_t)(*scratch >> 32));
            break;
          }
          num_bits_2 += 8;
          *scratch |= ((uint64_t)(num_bits_2));
        }
      }
      v_checksum_want = t_2;
    }
    if (!self->private_impl.f_ignore_checksum &&
        (v_checksum_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] = coro_susp_point;
  self->private_impl.active_coroutine = 1;
  self->private_data.s_decode_io_writer[0].v_checksum_got = v_checksum_got;

  goto exit;
exit:
  if (a_dst.private_impl.buf) {
    a_dst.private_impl.buf->meta.wi =
        ((size_t)(iop_a_dst - a_dst.private_impl.buf->data.ptr));
  }
  if (a_src.private_impl.buf) {
    a_src.private_impl.buf->meta.ri =
        ((size_t)(iop_a_src - a_src.private_impl.buf->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