AuroraMiddleware/zstd
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Improved speed for small files

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This commit is contained in:
Yann Collet 2016-03-19 17:18:00 +01:00
parent e74215e3c7
commit c6eea2b2f2
1 changed files with 27 additions and 24 deletions
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29
lib/zstd_compress.c
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@ -157,12 +157,14 @@ void ZSTD_validateParams(ZSTD_parameters* params)
/* correct params, to use less memory */
if ((params->srcSize > 0) && (params->srcSize < (1<<ZSTD_WINDOWLOG_MAX))) {
U32 srcLog = ZSTD_highbit((U32)(params->srcSize)-1) + 1;
U32 const srcLog = ZSTD_highbit((U32)(params->srcSize)-1) + 1;
if (params->windowLog > srcLog) params->windowLog = srcLog;
}
if (params->windowLog < ZSTD_WINDOWLOG_ABSOLUTEMIN) params->windowLog = ZSTD_WINDOWLOG_ABSOLUTEMIN; /* required for frame header */
if (params->hashLog > params->windowLog) params->hashLog = params->windowLog;
{ U32 const btPlus = (params->strategy == ZSTD_btlazy2) || (params->strategy == ZSTD_btopt);
if (params->contentLog > params->windowLog+btPlus) params->contentLog = params->windowLog+btPlus; } /* <= ZSTD_CONTENTLOG_MAX */
if (params->windowLog < ZSTD_WINDOWLOG_ABSOLUTEMIN) params->windowLog = ZSTD_WINDOWLOG_ABSOLUTEMIN; /* required for frame header */
}
@ -170,7 +172,7 @@ size_t ZSTD_sizeofCCtx(ZSTD_parameters params) /* hidden interface, for parama
{
ZSTD_CCtx* zc = ZSTD_createCCtx();
ZSTD_compressBegin_advanced(zc, NULL, 0, params);
{ size_t size = sizeof(*zc) + zc->workSpaceSize;
{ size_t const size = sizeof(*zc) + zc->workSpaceSize;
ZSTD_freeCCtx(zc);
return size; }
}
@ -183,9 +185,10 @@ static size_t ZSTD_resetCCtx_advanced (ZSTD_CCtx* zc,
const U32 divider = (params.searchLength==3) ? 3 : 4;
const size_t maxNbSeq = blockSize / divider;
const size_t tokenSpace = blockSize + 8*maxNbSeq;
const U32 contentLog = (params.strategy == ZSTD_fast) ? 1 : params.contentLog;
const size_t contentSize = (params.strategy == ZSTD_fast) ? 0 : (1 << params.contentLog);
const size_t hSize = 1 << params.hashLog;
const size_t h3Size = (params.searchLength==3) ? (1 << HASHLOG3) : 0;
const size_t tableSpace = ((1 << contentLog) + (1 << params.hashLog) + h3Size) * sizeof(U32);
const size_t tableSpace = (contentSize + hSize + h3Size) * sizeof(U32);
/* Check if workSpace is large enough, alloc a new one if needed */
{ size_t const optSpace = ((1<<MLbits) + (1<<LLbits) + (1<<Offbits) + (1<<Litbits))*sizeof(U32)
@ -197,14 +200,13 @@ static size_t ZSTD_resetCCtx_advanced (ZSTD_CCtx* zc,
zc->workSpace = malloc(neededSpace);
if (zc->workSpace == NULL) return ERROR(memory_allocation);
zc->workSpaceSize = neededSpace;
}
}
} }
memset(zc->workSpace, 0, tableSpace ); /* reset only tables */
zc->hashTable3 = (U32*)(zc->workSpace);
zc->hashTable = zc->hashTable3 + h3Size;
zc->contentTable = zc->hashTable + ((size_t)1 << params.hashLog);
zc->seqStore.buffer = zc->contentTable + ((size_t)1 << contentLog);
zc->contentTable = zc->hashTable + hSize;
zc->seqStore.buffer = zc->contentTable + contentSize;
zc->hufTable = (HUF_CElt*)zc->seqStore.buffer;
zc->flagStaticTables = 0;
zc->seqStore.buffer = (U32*)(zc->seqStore.buffer) + 256;
@ -248,16 +250,17 @@ static size_t ZSTD_resetCCtx_advanced (ZSTD_CCtx* zc,
* @return : 0, or an error code */
size_t ZSTD_copyCCtx(ZSTD_CCtx* dstCCtx, const ZSTD_CCtx* srcCCtx)
{
const U32 contentLog = (srcCCtx->params.strategy == ZSTD_fast) ? 1 : srcCCtx->params.contentLog;
const size_t h3Size = (srcCCtx->params.searchLength == 3) ? (1 << HASHLOG3) : 0;
const size_t tableSpace = ((1 << contentLog) + (1 << srcCCtx->params.hashLog) + h3Size) * sizeof(U32);
if (srcCCtx->stage!=0) return ERROR(stage_wrong);
ZSTD_resetCCtx_advanced(dstCCtx, srcCCtx->params);
/* copy tables */
{ const size_t contentSize = (srcCCtx->params.strategy == ZSTD_fast) ? 0 : (1 << srcCCtx->params.contentLog);
const size_t hSize = 1 << srcCCtx->params.hashLog;
const size_t h3Size = (srcCCtx->params.searchLength == 3) ? (1 << HASHLOG3) : 0;
const size_t tableSpace = (contentSize + hSize + h3Size) * sizeof(U32);
memcpy(dstCCtx->workSpace, srcCCtx->workSpace, tableSpace);
}
/* copy frame header */
dstCCtx->hbSize = srcCCtx->hbSize;