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zopflib/src/zopflipng/lodepng/lodepng_util.cpp  view on Meta::CPAN

  std::vector<unsigned char> zdata;

  while(chunk + 8 < end && chunk >= begin)
  {
    char type[5];
    lodepng_chunk_type(type, chunk);
    if(std::string(type).size() != 4) return 1; //Probably not a PNG file

    if(std::string(type) == "IDAT")
    {
      const unsigned char* cdata = lodepng_chunk_data_const(chunk);
      unsigned clength = lodepng_chunk_length(chunk);
      if(chunk + clength + 12 > end || clength > png.size() || chunk + clength + 12 < begin) {
        // corrupt chunk length
        return 1;
      }

      for(unsigned i = 0; i < clength; i++)
      {
        zdata.push_back(cdata[i]);
      }
    }

    next = lodepng_chunk_next_const(chunk);
    if (next <= chunk) return 1; // integer overflow
    chunk = next;
  }

  //Decompress all IDAT data
  std::vector<unsigned char> data;