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liblzma: Fix a compression-ratio regression in LZMA1/2 in fast mode.

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The bug was added in the commit
f48fce093b07aeda95c18850f5e086d9f2383380 and thus
affected 5.1.4beta and 5.2.0. Luckily the bug cannot
cause data corruption or other nasty things.
This commit is contained in:
Lasse Collin 2015-02-21 23:40:26 +02:00
parent ae984e31c1
commit 117d962685
1 changed files with 1 additions and 1 deletions
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src/liblzma/lzma/lzma_encoder_optimum_fast.c
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@ -152,7 +152,7 @@ lzma_lzma_optimum_fast(lzma_coder *restrict coder, lzma_mf *restrict mf,
// the old buf pointer instead of recalculating it with mf_ptr(). // the old buf pointer instead of recalculating it with mf_ptr().
++buf; ++buf;
const uint32_t limit = len_main - 1; const uint32_t limit = my_max(2, len_main - 1);
for (uint32_t i = 0; i < REPS; ++i) { for (uint32_t i = 0; i < REPS; ++i) {
if (memcmp(buf, buf - coder->reps[i] - 1, limit) == 0) { if (memcmp(buf, buf - coder->reps[i] - 1, limit) == 0) {