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new correction, less extreme replacement value

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This commit is contained in:
Yann Collet
2016-06-20 19:15:37 +02:00
parent 5477cc25f7
commit 4623d11571
1 changed files with 4 additions and 4 deletions
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lib/compress/zstd_compress.c
+4 -4
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@@ -1186,8 +1186,8 @@ void ZSTD_compressBlock_fast_generic(ZSTD_CCtx* cctx,
} } } } } }
/* save reps for next block */ /* save reps for next block */
cctx->savedRep[0] = offset_1 ? (U32)offset_1 : (U32)(1 GB); cctx->savedRep[0] = offset_1 ? (U32)offset_1 : (U32)(iend-base)+2;
cctx->savedRep[1] = offset_2 ? (U32)offset_2 : (U32)(1 GB); cctx->savedRep[1] = offset_2 ? (U32)offset_2 : (U32)(iend-base)+2;
/* Last Literals */ /* Last Literals */
{ size_t const lastLLSize = iend - anchor; { size_t const lastLLSize = iend - anchor;
@@ -1844,7 +1844,7 @@ _storeSequence:
/* Save reps for next block */ /* Save reps for next block */
{ int i; { int i;
for (i=0; i<ZSTD_REP_NUM; i++) { for (i=0; i<ZSTD_REP_NUM; i++) {
if (!rep[i]) rep[i] = (U32)(1 GB); /* in case some zero are left */ if (!rep[i]) rep[i] = (U32)(iend - ctx->base) + 2; /* in case some zero are left */
ctx->savedRep[i] = rep[i]; ctx->savedRep[i] = rep[i];
} } } }
@@ -2238,7 +2238,7 @@ static size_t ZSTD_compressContinue_internal (ZSTD_CCtx* zc,
/* preemptive overflow correction */ /* preemptive overflow correction */
if (zc->lowLimit > (1<<30)) { if (zc->lowLimit > (1<<30)) {
U32 const btplus = (zc->params.cParams.strategy == ZSTD_btlazy2) || (zc->params.cParams.strategy == ZSTD_btopt); U32 const btplus = (zc->params.cParams.strategy == ZSTD_btlazy2) | (zc->params.cParams.strategy == ZSTD_btopt);
U32 const chainMask = (1 << (zc->params.cParams.chainLog - btplus)) - 1; U32 const chainMask = (1 << (zc->params.cParams.chainLog - btplus)) - 1;
U32 const newLowLimit = zc->lowLimit & chainMask; /* preserve position % chainSize */ U32 const newLowLimit = zc->lowLimit & chainMask; /* preserve position % chainSize */
U32 const correction = zc->lowLimit - newLowLimit; U32 const correction = zc->lowLimit - newLowLimit;