Function HuffmanTree_makeFromLengths

src/lodepng.cpp:631–641

given the code lengths (as stored in the PNG file), generate the tree as defined by Deflate. maxbitlen is the maximum bits that a code in the tree can have. return value is error. */

return value is error.
*/
static unsigned HuffmanTree_makeFromLengths(HuffmanTree* tree, const unsigned* bitlen,
                                            size_t numcodes, unsigned maxbitlen)
{
  unsigned i;
  tree->lengths = (unsigned*)lodepng_malloc(numcodes * sizeof(unsigned));
  if(!tree->lengths) return 83; /*alloc fail*/
  for(i = 0; i < numcodes; i++) tree->lengths[i] = bitlen[i];
  tree->numcodes = (unsigned)numcodes; /*number of symbols*/
  tree->maxbitlen = maxbitlen;
  return HuffmanTree_makeFromLengths2(tree);
}

#ifdef LODEPNG_COMPILE_ENCODER