From: Yann Collet <yann.collet.73@gmail.com>
Date: Fri, 29 Jul 2016 23:09:14 +0000 (+0200)
Subject: fixed too large selectivity level, reported by Ilona Papava
X-Git-Tag: v0.8.0^2~13
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=70a9ff4af31b0580abde8f8abbd4c1921b37340b;p=thirdparty%2Fzstd.git

fixed too large selectivity level, reported by Ilona Papava
---

diff --git a/lib/dictBuilder/zdict.c b/lib/dictBuilder/zdict.c
index 84272d194..e1bece3a7 100644
--- a/lib/dictBuilder/zdict.c
+++ b/lib/dictBuilder/zdict.c
@@ -879,7 +879,7 @@ size_t ZDICT_trainFromBuffer_unsafe(
     U32 const dictListSize = MAX(MAX(DICTLISTSIZE, nbSamples), (U32)(maxDictSize/16));
     dictItem* const dictList = (dictItem*)malloc(dictListSize * sizeof(*dictList));
     unsigned const selectivity = params.selectivityLevel == 0 ? g_selectivity_default : params.selectivityLevel;
-    unsigned const minRep = nbSamples >> selectivity;
+    unsigned const minRep = (selectivity > 30) ? 1 : nbSamples >> selectivity;
     size_t const targetDictSize = maxDictSize;
     size_t const samplesBuffSize = ZDICT_totalSampleSize(samplesSizes, nbSamples);
     size_t dictSize = 0;