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fixed compression ratio regression when dictionary-compressing medium-size inputs at levels 1-3

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Yann Collet
2019-08-01 15:58:17 +02:00
parent c25df8ba3f
commit 98692c2838
6 changed files with 76 additions and 48 deletions
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lib/compress/zstd_double_fast.c
+4 -2
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@@ -370,8 +370,10 @@ static size_t ZSTD_compressBlock_doubleFast_extDict_generic(
const BYTE* const base = ms->window.base;
const U32 endIndex = (U32)((size_t)(istart - base) + srcSize);
const U32 maxDistance = 1U << cParams->windowLog;
const U32 lowestValid = ms->window.lowLimit;
const U32 lowLimit = (endIndex - lowestValid > maxDistance) ? endIndex - maxDistance : lowestValid;
const U32 validLowest = ms->window.lowLimit;
const int isDictionary = (ms->loadedDictEnd != 0);
const U32 withinWindow = (endIndex - validLowest > maxDistance) ? endIndex - maxDistance : validLowest;
const U32 lowLimit = isDictionary ? validLowest : withinWindow;
const U32 dictStartIndex = lowLimit;
const U32 dictLimit = ms->window.dictLimit;
const U32 prefixStartIndex = (dictLimit > lowLimit) ? dictLimit : lowLimit;