get the literal and length code tree of a deflated block with fixed tree, as per the deflate specification*/
| 906 | |
| 907 | /*get the literal and length code tree of a deflated block with fixed tree, as per the deflate specification*/ |
| 908 | static unsigned generateFixedLitLenTree(HuffmanTree* tree) |
| 909 | { |
| 910 | unsigned i, error = 0; |
| 911 | unsigned* bitlen = (unsigned*)lodepng_malloc(NUM_DEFLATE_CODE_SYMBOLS * sizeof(unsigned)); |
| 912 | if(!bitlen) return 83; /*alloc fail*/ |
| 913 | |
| 914 | /*288 possible codes: 0-255=literals, 256=endcode, 257-285=lengthcodes, 286-287=unused*/ |
| 915 | for(i = 0; i <= 143; ++i) bitlen[i] = 8; |
| 916 | for(i = 144; i <= 255; ++i) bitlen[i] = 9; |
| 917 | for(i = 256; i <= 279; ++i) bitlen[i] = 7; |
| 918 | for(i = 280; i <= 287; ++i) bitlen[i] = 8; |
| 919 | |
| 920 | error = HuffmanTree_makeFromLengths(tree, bitlen, NUM_DEFLATE_CODE_SYMBOLS, 15); |
| 921 | |
| 922 | lodepng_free(bitlen); |
| 923 | return error; |
| 924 | } |
| 925 | |
| 926 | /*get the distance code tree of a deflated block with fixed tree, as specified in the deflate specification*/ |
| 927 | static unsigned generateFixedDistanceTree(HuffmanTree* tree) |
no test coverage detected