640 /*the distance codes have their own symbols, 30 used, 2 unused*/
657 /*the base backwards distances (the bits of distance codes appear after length codes and use their …
806         appear at all, but such huffman tree could still exist (e.g. if distance  in HuffmanTree_makeTable()
1118 /*get the distance code tree of a deflated block with fixed tree, as specified in the deflate speci…
1125     /*there are 32 distance codes, but 30-31 are unused*/  in generateFixedDistanceTree()
1191     /*number of distance codes. Unlike the spec, the value 1 is added to it here already*/  in getTreeInflateDynamic()
1316     HuffmanTree tree_d; /*the huffman tree for distance codes*/  in inflateHuffmanBlock()
1346             unsigned code_d, distance;  in inflateHuffmanBlock()  local
1347             unsigned numextrabits_l, numextrabits_d; /*extra bits for length and distance*/  in inflateHuffmanBlock()
1361             /*part 3: get distance code*/  in inflateHuffmanBlock()
1366                     ERROR_BREAK(18); /*error: invalid distance code (30-31 are never used)*/  in inflateHuffmanBlock()
1372             distance = DISTANCEBASE[code_d];  in inflateHuffmanBlock()
1374             /*part 4: get extra bits from distance*/  in inflateHuffmanBlock()
1378                 distance += readBits(reader, numextrabits_d);  in inflateHuffmanBlock()
1383             if(distance > start) ERROR_BREAK(52); /*too long backward distance*/  in inflateHuffmanBlock()
1384             backward = start - distance;  in inflateHuffmanBlock()
1387             if(distance < length) {  in inflateHuffmanBlock()
1389                 lodepng_memcpy(out->data + start, out->data + backward, distance);  in inflateHuffmanBlock()
1390                 start += distance;  in inflateHuffmanBlock()
1391                 for(forward = distance; forward < length; ++forward) {  in inflateHuffmanBlock()
1548 static void addLengthDistance(uivector * values, size_t length, size_t distance)  in addLengthDistance()  argument
1553 …257-285: length/distance pair (length code, followed by extra length bits, distance code, extra di…  in addLengthDistance()
1558     unsigned dist_code = (unsigned)searchCodeIndex(DISTANCEBASE, 30, distance);  in addLengthDistance()
1559     unsigned extra_distance = (unsigned)(distance - DISTANCEBASE[dist_code]);  in addLengthDistance()
1676 length/distance pairs.
1695     unsigned offset; /*the offset represents the distance in LZ77 terminology*/  in encodeLZ77()
1808         /*encode it as length/distance pair or literal value*/  in encodeLZ77()
1809         if(length < 3) { /*only lengths of 3 or higher are supported as length/distance pair*/  in encodeLZ77()
1877 tree_d: the tree for distance codes.
1913     literal bytes and length/distance pairs. This is then huffman compressed with  in deflateDynamic()
1922 …/*The lz77 encoded data, represented with integers since there will also be length and distance co…  in deflateDynamic()
1925     HuffmanTree tree_d; /*tree for distance codes*/  in deflateDynamic()
2075         - HDIST + 1 code lengths of distance alphabet (encoded using the code length  in deflateDynamic()
2139     HuffmanTree tree_d; /*tree for distance codes*/  in deflateFixed()
7226             return "invalid distance code while inflating";  in lodepng_error_text()