| 1651 | /* /////////////////////////////////////////////////////////////////////////// */ |
| 1652 | |
| 1653 | static unsigned deflateNoCompression(ucvector* out, const unsigned char* data, size_t datasize) |
| 1654 | { |
| 1655 | /*non compressed deflate block data: 1 bit BFINAL,2 bits BTYPE,(5 bits): it jumps to start of next byte, |
| 1656 | 2 bytes LEN, 2 bytes NLEN, LEN bytes literal DATA*/ |
| 1657 | |
| 1658 | size_t i, j, numdeflateblocks = (datasize + 65534) / 65535; |
| 1659 | unsigned datapos = 0; |
| 1660 | for(i = 0; i != numdeflateblocks; ++i) |
| 1661 | { |
| 1662 | unsigned BFINAL, BTYPE, LEN, NLEN; |
| 1663 | unsigned char firstbyte; |
| 1664 | |
| 1665 | BFINAL = (i == numdeflateblocks - 1); |
| 1666 | BTYPE = 0; |
| 1667 | |
| 1668 | firstbyte = (unsigned char)(BFINAL + ((BTYPE & 1) << 1) + ((BTYPE & 2) << 1)); |
| 1669 | ucvector_push_back(out, firstbyte); |
| 1670 | |
| 1671 | LEN = 65535; |
| 1672 | if(datasize - datapos < 65535) LEN = (unsigned)datasize - datapos; |
| 1673 | NLEN = 65535 - LEN; |
| 1674 | |
| 1675 | ucvector_push_back(out, (unsigned char)(LEN & 255)); |
| 1676 | ucvector_push_back(out, (unsigned char)(LEN >> 8)); |
| 1677 | ucvector_push_back(out, (unsigned char)(NLEN & 255)); |
| 1678 | ucvector_push_back(out, (unsigned char)(NLEN >> 8)); |
| 1679 | |
| 1680 | /*Decompressed data*/ |
| 1681 | for(j = 0; j < 65535 && datapos < datasize; ++j) |
| 1682 | { |
| 1683 | ucvector_push_back(out, data[datapos++]); |
| 1684 | } |
| 1685 | } |
| 1686 | |
| 1687 | return 0; |
| 1688 | } |
| 1689 | |
| 1690 | /* |
| 1691 | write the lz77-encoded data, which has lit, len and dist codes, to compressed stream using huffman trees. |
no test coverage detected