Function deflateFixed

dependency/densecrf/examples/lodepng.cpp:1969–2015

}

static unsigned deflateFixed(ucvector* out, size_t* bp, Hash* hash,
                             const unsigned char* data,
                             size_t datapos, size_t dataend,
                             const LodePNGCompressSettings* settings, unsigned final)
{
    HuffmanTree tree_ll; /*tree for literal values and length codes*/
    HuffmanTree tree_d; /*tree for distance codes*/
    
    unsigned BFINAL = final;
    unsigned error = 0;
    size_t i;
    
    HuffmanTree_init(&tree_ll);
    HuffmanTree_init(&tree_d);
    
    generateFixedLitLenTree(&tree_ll);
    generateFixedDistanceTree(&tree_d);
    
    addBitToStream(bp, out, BFINAL);
    addBitToStream(bp, out, 1); /*first bit of BTYPE*/
    addBitToStream(bp, out, 0); /*second bit of BTYPE*/
    
    if(settings->use_lz77) /*LZ77 encoded*/
    {
        uivector lz77_encoded;
        uivector_init(&lz77_encoded);
        error = encodeLZ77(&lz77_encoded, hash, data, datapos, dataend, settings->windowsize,
                           settings->minmatch, settings->nicematch, settings->lazymatching);
        if(!error) writeLZ77data(bp, out, &lz77_encoded, &tree_ll, &tree_d);
        uivector_cleanup(&lz77_encoded);
    }
    else /*no LZ77, but still will be Huffman compressed*/
    {
        for(i = datapos; i < dataend; ++i)
        {
            addHuffmanSymbol(bp, out, HuffmanTree_getCode(&tree_ll, data[i]), HuffmanTree_getLength(&tree_ll, data[i]));
        }
    }
    /*add END code*/
    if(!error) addHuffmanSymbol(bp, out, HuffmanTree_getCode(&tree_ll, 256), HuffmanTree_getLength(&tree_ll, 256));
    
    /*cleanup*/
    HuffmanTree_cleanup(&tree_ll);
    HuffmanTree_cleanup(&tree_d);
    
    return error;
}

static unsigned lodepng_deflatev(ucvector* out, const unsigned char* in, size_t insize,
                                 const LodePNGCompressSettings* settings)