Function lodepng_chunk_append

depends/lodepng/lodepng.cpp:2564–2581

}

unsigned lodepng_chunk_append(unsigned char** out, size_t* outsize, const unsigned char* chunk) {
  unsigned i;
  size_t total_chunk_length, new_length;
  unsigned char *chunk_start, *new_buffer;

  if(lodepng_addofl(lodepng_chunk_length(chunk), 12, &total_chunk_length)) return 77;
  if(lodepng_addofl(*outsize, total_chunk_length, &new_length)) return 77;

  new_buffer = (unsigned char*)lodepng_realloc(*out, new_length);
  if(!new_buffer) return 83; /*alloc fail*/
  (*out) = new_buffer;
  (*outsize) = new_length;
  chunk_start = &(*out)[new_length - total_chunk_length];

  for(i = 0; i != total_chunk_length; ++i) chunk_start[i] = chunk[i];

  return 0;
}

/*Sets length and name and allocates the space for data and crc but does not
set data or crc yet. Returns the start of the chunk in chunk. The start of