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fixed roll buffer lazy2 mode

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This commit is contained in:
Yann Collet 2015-11-22 12:22:04 +01:00
parent b7fc88eec7
commit a85c77b9d3
1 changed files with 7 additions and 1 deletions
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8
lib/zstd_compress.c
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@ -1581,6 +1581,7 @@ size_t ZSTD_compressBlock_lazy_extDict_generic(ZSTD_CCtx* ctx,
const U32 repIndex = (U32)(current - offset_1); const U32 repIndex = (U32)(current - offset_1);
const BYTE* const repBase = repIndex < dictLimit ? dictBase : base; const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
const BYTE* const repMatch = repBase + repIndex; const BYTE* const repMatch = repBase + repIndex;
if ((repIndex <= dictLimit-4) || (repIndex >= dictLimit))
if (MEM_read32(ip) == MEM_read32(repMatch)) if (MEM_read32(ip) == MEM_read32(repMatch))
{ {
/* repcode detected */ /* repcode detected */
@ -1681,6 +1682,11 @@ size_t ZSTD_compressBlock_lazy_extDict(ZSTD_CCtx* ctx, void* dst, size_t maxDstS
return ZSTD_compressBlock_lazy_extDict_generic(ctx, dst, maxDstSize, src, srcSize, 0, 1); return ZSTD_compressBlock_lazy_extDict_generic(ctx, dst, maxDstSize, src, srcSize, 0, 1);
} }
size_t ZSTD_compressBlock_lazy2_extDict(ZSTD_CCtx* ctx, void* dst, size_t maxDstSize, const void* src, size_t srcSize)
{
return ZSTD_compressBlock_lazy_extDict_generic(ctx, dst, maxDstSize, src, srcSize, 0, 2);
}
typedef size_t (*ZSTD_blockCompressor) (ZSTD_CCtx* ctx, void* dst, size_t maxDstSize, const void* src, size_t srcSize); typedef size_t (*ZSTD_blockCompressor) (ZSTD_CCtx* ctx, void* dst, size_t maxDstSize, const void* src, size_t srcSize);
@ -1698,7 +1704,7 @@ static ZSTD_blockCompressor ZSTD_selectBlockCompressor(ZSTD_strategy strat, int
case ZSTD_lazy: case ZSTD_lazy:
return ZSTD_compressBlock_lazy_extDict; return ZSTD_compressBlock_lazy_extDict;
case ZSTD_lazy2: case ZSTD_lazy2:
return ZSTD_compressBlock_lazy2; return ZSTD_compressBlock_lazy2_extDict;
case ZSTD_btlazy2: case ZSTD_btlazy2:
return ZSTD_compressBlock_btlazy2; return ZSTD_compressBlock_btlazy2;
} }