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fixed : compression bug on very large files

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This commit is contained in:
Yann Collet 2016-08-25 14:34:42 +02:00
parent 2c9e90e711
commit 96bdd87de4
1 changed files with 1 additions and 1 deletions
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2
lib/compress/zstd_compress.c
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@ -2274,7 +2274,7 @@ static size_t ZSTD_compress_generic (ZSTD_CCtx* cctx,
if (cctx->lowLimit > (1<<30)) { if (cctx->lowLimit > (1<<30)) {
U32 const btplus = (cctx->params.cParams.strategy == ZSTD_btlazy2) | (cctx->params.cParams.strategy == ZSTD_btopt); U32 const btplus = (cctx->params.cParams.strategy == ZSTD_btlazy2) | (cctx->params.cParams.strategy == ZSTD_btopt);
U32 const chainMask = (1 << (cctx->params.cParams.chainLog - btplus)) - 1; U32 const chainMask = (1 << (cctx->params.cParams.chainLog - btplus)) - 1;
U32 const newLowLimit = cctx->lowLimit & chainMask; /* preserve position % chainSize */ U32 const newLowLimit = (cctx->lowLimit & chainMask) + (chainMask+1); /* preserve position % chainSize, ensure current-repcode doesn't underflow */
U32 const correction = cctx->lowLimit - newLowLimit; U32 const correction = cctx->lowLimit - newLowLimit;
ZSTD_reduceIndex(cctx, correction); ZSTD_reduceIndex(cctx, correction);
cctx->base += correction; cctx->base += correction;