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2008-06-01Fix a buffer overflow in the LZMA encoder. It was due to myLasse Collin1-10/+5
misunderstanding of the code. There's no tiny fix for this problem, so I also cleaned up the code in general. This reduces the speed of the encoder 2-5 % in the fastest compression mode ("lzma -1"). High compression modes should have no noticeable performance difference. This commit breaks things (especially LZMA_SYNC_FLUSH) but I will fix them once the new format and LZMA2 has been roughly implemented. Plain LZMA won't support LZMA_SYNC_FLUSH at all and won't be supported in the new .lzma format. This may change still but this is what it looks like now. Support for known uncompressed size (that is, LZMA or LZMA2 without EOPM) is likely to go away. This means there will be API changes.
2008-03-22Demystified the "state" variable in LZMA code. Use theLasse Collin1-4/+4
word literal instead of char for better consistency. There are still some names with _char instead of _literal in lzma_optimum, these may be changed later. Renamed length coder variables. This commit doesn't change the program logic.
2008-01-15Revised the fastpos code. It now uses the slightly fasterLasse Collin1-21/+0
table-based version from LZMA SDK 4.57. This should be fast on most systems. A simpler and smaller alternative version is also provided. On some CPUs this can be even a little faster than the default table-based version (see comments in fastpos.h), but on most systems the table-based code is faster.
2008-01-14Remove RC_BUFFER_SIZE from lzma_encoder_private.hLasse Collin1-2/+4
and replace it with a sanity check.
2008-01-14In lzma_read_match_distances(), don't useLasse Collin1-3/+3
coder->lz.stream_end_was_reached. That variable will be removed, and the check isn't required anyway. Rearrange the check so that it doesn't make one to think that there could be an integer overflow.
2007-12-09Imported to git.Lasse Collin1-0/+225