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€fãLÜiµ1hßÂ„nŸ_†I|¥+ÂÁ <ó    // Copyright 2012 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// -----------------------------------------------------------------------------
//
// Demux API.
// Enables extraction of image and extended format data from WebP files.

// Code Example: Demuxing WebP data to extract all the frames, ICC profile
// and EXIF/XMP metadata.
/*
  WebPDemuxer* demux = WebPDemux(&webp_data);

  uint32_t width = WebPDemuxGetI(demux, WEBP_FF_CANVAS_WIDTH);
  uint32_t height = WebPDemuxGetI(demux, WEBP_FF_CANVAS_HEIGHT);
  // ... (Get information about the features present in the WebP file).
  uint32_t flags = WebPDemuxGetI(demux, WEBP_FF_FORMAT_FLAGS);

  // ... (Iterate over all frames).
  WebPIterator iter;
  if (WebPDemuxGetFrame(demux, 1, &iter)) {
    do {
      // ... (Consume 'iter'; e.g. Decode 'iter.fragment' with WebPDecode(),
      // ... and get other frame properties like width, height, offsets etc.
      // ... see 'struct WebPIterator' below for more info).
    } while (WebPDemuxNextFrame(&iter));
    WebPDemuxReleaseIterator(&iter);
  }

  // ... (Extract metadata).
  WebPChunkIterator chunk_iter;
  if (flags & ICCP_FLAG) WebPDemuxGetChunk(demux, "ICCP", 1, &chunk_iter);
  // ... (Consume the ICC profile in 'chunk_iter.chunk').
  WebPDemuxReleaseChunkIterator(&chunk_iter);
  if (flags & EXIF_FLAG) WebPDemuxGetChunk(demux, "EXIF", 1, &chunk_iter);
  // ... (Consume the EXIF metadata in 'chunk_iter.chunk').
  WebPDemuxReleaseChunkIterator(&chunk_iter);
  if (flags & XMP_FLAG) WebPDemuxGetChunk(demux, "XMP ", 1, &chunk_iter);
  // ... (Consume the XMP metadata in 'chunk_iter.chunk').
  WebPDemuxReleaseChunkIterator(&chunk_iter);
  WebPDemuxDelete(demux);
*/

#ifndef WEBP_WEBP_DEMUX_H_
#define WEBP_WEBP_DEMUX_H_

#include "./decode.h"     // for WEBP_CSP_MODE
#include "./mux_types.h"

#ifdef __cplusplus
extern "C" {
#endif

#define WEBP_DEMUX_ABI_VERSION 0x0107    // MAJOR(8b) + MINOR(8b)

// Note: forward declaring enumerations is not allowed in (strict) C and C++,
// the types are left here for reference.
// typedef enum WebPDemuxState WebPDemuxState;
// typedef enum WebPFormatFeature WebPFormatFeature;
typedef struct WebPDemuxer WebPDemuxer;
typedef struct WebPIterator WebPIterator;
typedef struct WebPChunkIterator WebPChunkIterator;
typedef struct WebPAnimInfo WebPAnimInfo;
typedef struct WebPAnimDecoderOptions WebPAnimDecoderOptions;

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

// Returns the version number of the demux library, packed in hexadecimal using
// 8bits for each of major/minor/revision. E.g: v2.5.7 is 0x020507.
WEBP_EXTERN int WebPGetDemuxVersion(void);

//------------------------------------------------------------------------------
// Life of a Demux object

typedef enum WebPDemuxState {
  WEBP_DEMUX_PARSE_ERROR    = -1,  // An error occurred while parsing.
  WEBP_DEMUX_PARSING_HEADER =  0,  // Not enough data to parse full header.
  WEBP_DEMUX_PARSED_HEADER  =  1,  // Header parsing complete,
                                   // data may be available.
  WEBP_DEMUX_DONE           =  2   // Entire file has been parsed.
} WebPDemuxState;

// Internal, version-checked, entry point
WEBP_EXTERN WebPDemuxer* WebPDemuxInternal(
    const WebPData*, int, WebPDemuxState*, int);

// Parses the full WebP file given by 'data'. For single images the WebP file
// header alone or the file header and the chunk header may be absent.
// Returns a WebPDemuxer object on successful parse, NULL otherwise.
static WEBP_INLINE WebPDemuxer* WebPDemux(const WebPData* data) {
  return WebPDemuxInternal(data, 0, NULL, WEBP_DEMUX_ABI_VERSION);
}

// Parses the possibly incomplete WebP file given by 'data'.
// If