unsigned lodepng_chunk_append(unsigned char** out, size_t* outlength, const unsigned char* chunk)
{
  unsigned i;
  unsigned total_chunk_length = lodepng_chunk_length(chunk) + 12;
  unsigned char *chunk_start, *new_buffer;
  size_t new_length = (*outlength) + total_chunk_length;
  if(new_length < total_chunk_length || new_length < (*outlength)) return 77; /*integer overflow happened*/

  new_buffer = (unsigned char*)realloc(*out, new_length);
  if(!new_buffer) return 83; /*alloc fail*/
  (*out) = new_buffer;
  (*outlength) = 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;
}
Unknown