Function inflateNoCompression

depends/lodepng/lodepng.cpp:1356–1386

}

static unsigned inflateNoCompression(ucvector* out, LodePNGBitReader* reader,
                                     const LodePNGDecompressSettings* settings) {
  size_t bytepos;
  size_t size = reader->size;
  unsigned LEN, NLEN, error = 0;

  /*go to first boundary of byte*/
  bytepos = (reader->bp + 7u) >> 3u;

  /*read LEN (2 bytes) and NLEN (2 bytes)*/
  if(bytepos + 4 >= size) return 52; /*error, bit pointer will jump past memory*/
  LEN = (unsigned)reader->data[bytepos] + ((unsigned)reader->data[bytepos + 1] << 8u); bytepos += 2;
  NLEN = (unsigned)reader->data[bytepos] + ((unsigned)reader->data[bytepos + 1] << 8u); bytepos += 2;

  /*check if 16-bit NLEN is really the one's complement of LEN*/
  if(!settings->ignore_nlen && LEN + NLEN != 65535) {
    return 21; /*error: NLEN is not one's complement of LEN*/
  }

  if(!ucvector_resize(out, out->size + LEN)) return 83; /*alloc fail*/

  /*read the literal data: LEN bytes are now stored in the out buffer*/
  if(bytepos + LEN > size) return 23; /*error: reading outside of in buffer*/

  lodepng_memcpy(out->data + out->size - LEN, reader->data + bytepos, LEN);
  bytepos += LEN;

  reader->bp = bytepos << 3u;

  return error;
}

static unsigned lodepng_inflatev(ucvector* out,
                                 const unsigned char* in, size_t insize,