From 117d962685c72682c63edc9bb765367189800202 Mon Sep 17 00:00:00 2001 From: Lasse Collin Date: Sat, 21 Feb 2015 23:40:26 +0200 Subject: [PATCH] liblzma: Fix a compression-ratio regression in LZMA1/2 in fast mode. 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. --- src/liblzma/lzma/lzma_encoder_optimum_fast.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/liblzma/lzma/lzma_encoder_optimum_fast.c b/src/liblzma/lzma/lzma_encoder_optimum_fast.c index 8922cbd9..9b30347c 100644 --- a/src/liblzma/lzma/lzma_encoder_optimum_fast.c +++ b/src/liblzma/lzma/lzma_encoder_optimum_fast.c @@ -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(). ++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) { if (memcmp(buf, buf - coder->reps[i] - 1, limit) == 0) { -- 2.11.4.GIT