int mz_compress2(unsigned char *pDest, mz_ulong *pDest_len,
                 const unsigned char *pSource, mz_ulong source_len, int level) {
  int status;
  mz_stream stream;
  memset(&stream, 0, sizeof(stream));

  // In case mz_ulong is 64-bits (argh I hate longs).
  if ((source_len | *pDest_len) > 0xFFFFFFFFU) return MZ_PARAM_ERROR;

  stream.next_in = pSource;
  stream.avail_in = (mz_uint32)source_len;
  stream.next_out = pDest;
  stream.avail_out = (mz_uint32)*pDest_len;

  status = mz_deflateInit(&stream, level);
  if (status != MZ_OK) return status;

  status = mz_deflate(&stream, MZ_FINISH);
  if (status != MZ_STREAM_END) {
    mz_deflateEnd(&stream);
    return (status == MZ_OK) ? MZ_BUF_ERROR : status;
  }

  *pDest_len = stream.total_out;
  return mz_deflateEnd(&stream);
}