Function lodepng_chunk_next

depends/lodepng/lodepng.cpp:2516–2530

}

unsigned char* lodepng_chunk_next(unsigned char* chunk, unsigned char* end) {
  if(chunk >= end || end - chunk < 12) return end; /*too small to contain a chunk*/
  if(chunk[0] == 0x89 && chunk[1] == 0x50 && chunk[2] == 0x4e && chunk[3] == 0x47
    && chunk[4] == 0x0d && chunk[5] == 0x0a && chunk[6] == 0x1a && chunk[7] == 0x0a) {
    /* Is PNG magic header at start of PNG file. Jump to first actual chunk. */
    return chunk + 8;
  } else {
    size_t total_chunk_length;
    unsigned char* result;
    if(lodepng_addofl(lodepng_chunk_length(chunk), 12, &total_chunk_length)) return end;
    result = chunk + total_chunk_length;
    if(result < chunk) return end; /*pointer overflow*/
    return result;
  }
}

const unsigned char* lodepng_chunk_next_const(const unsigned char* chunk, const unsigned char* end) {
  if(chunk >= end || end - chunk < 12) return end; /*too small to contain a chunk*/