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Simplify segfault fix

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Take advantage of the fact that `chainLog <= windowLog`.
This commit is contained in:
Nick Terrell 2016-12-10 18:46:55 -08:00
parent 0012332ce0
commit 3826207a70
1 changed files with 1 additions and 1 deletions
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lib/compress/zstd_compress.c
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@ -2277,7 +2277,7 @@ static size_t ZSTD_compress_generic (ZSTD_CCtx* cctx,
if (cctx->lowLimit > (1<<30)) {
U32 const btplus = (cctx->params.cParams.strategy == ZSTD_btlazy2) | (cctx->params.cParams.strategy == ZSTD_btopt) | (cctx->params.cParams.strategy == ZSTD_btopt2);
U32 const chainMask = (1 << (cctx->params.cParams.chainLog - btplus)) - 1;
U32 const supLog = MAX(MAX(cctx->params.cParams.chainLog, 17 /* blockSize */), cctx->params.cParams.windowLog);
U32 const supLog = MAX(cctx->params.cParams.windowLog, 17 /* blockSize */);
U32 const newLowLimit = (cctx->lowLimit & chainMask) + (1 << supLog); /* preserve position % chainSize, ensure current-repcode doesn't underflow */
U32 const correction = cctx->lowLimit - newLowLimit;
ZSTD_reduceIndex(cctx, correction);