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code refactoring

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This commit is contained in:
Yann Collet 2016-03-20 01:09:18 +01:00
parent 70e4577179
commit a5c2c08c68
1 changed files with 11 additions and 11 deletions
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22
lib/zstd_compress.c
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@ -501,7 +501,7 @@ static size_t ZSTD_compressRleLiteralsBlock (void* dst, size_t dstCapacity, cons
} }
size_t ZSTD_minGain(size_t srcSize) { return (srcSize >> 6) + 2; } static size_t ZSTD_minGain(size_t srcSize) { return (srcSize >> 6) + 2; }
static size_t ZSTD_compressLiterals (ZSTD_CCtx* zc, static size_t ZSTD_compressLiterals (ZSTD_CCtx* zc,
void* dst, size_t dstCapacity, void* dst, size_t dstCapacity,
@ -514,8 +514,14 @@ static size_t ZSTD_compressLiterals (ZSTD_CCtx* zc,
U32 hType = IS_HUF; U32 hType = IS_HUF;
size_t cLitSize; size_t cLitSize;
if (dstCapacity < lhSize+1) return ERROR(dstSize_tooSmall); /* not enough space for compression */
/* small ? don't even attempt compression (speed opt) */
# define LITERAL_NOENTROPY 63
{ size_t const minLitSize = zc->flagStaticTables ? 6 : LITERAL_NOENTROPY;
if (srcSize <= minLitSize) return ZSTD_noCompressLiterals(dst, dstCapacity, src, srcSize);
}
if (dstCapacity < lhSize+1) return ERROR(dstSize_tooSmall); /* not enough space for compression */
if (zc->flagStaticTables && (lhSize==3)) { if (zc->flagStaticTables && (lhSize==3)) {
hType = IS_PCH; hType = IS_PCH;
singleStream = 1; singleStream = 1;
@ -581,14 +587,9 @@ size_t ZSTD_compressSequences(ZSTD_CCtx* zc,
BYTE* seqHead; BYTE* seqHead;
/* Compress literals */ /* Compress literals */
# define LITERAL_NOENTROPY 63 /* don't even attempt to compress literals below this threshold (cheap heuristic) */ { const BYTE* const literals = seqStorePtr->litStart;
{
const BYTE* const literals = seqStorePtr->litStart;
size_t const litSize = seqStorePtr->lit - literals; size_t const litSize = seqStorePtr->lit - literals;
size_t const minLitSize = zc->flagStaticTables ? 6 : LITERAL_NOENTROPY; size_t const cSize = ZSTD_compressLiterals(zc, op, dstCapacity, literals, litSize);
size_t const cSize = (litSize <= minLitSize) ?
ZSTD_noCompressLiterals(op, dstCapacity, literals, litSize) :
ZSTD_compressLiterals(zc, op, dstCapacity, literals, litSize);
if (ZSTD_isError(cSize)) return cSize; if (ZSTD_isError(cSize)) return cSize;
op += cSize; op += cSize;
} }
@ -604,8 +605,7 @@ size_t ZSTD_compressSequences(ZSTD_CCtx* zc,
if ((oend-op) < 3 /* dumps */ + 1 /*seqHead*/) if ((oend-op) < 3 /* dumps */ + 1 /*seqHead*/)
return ERROR(dstSize_tooSmall); return ERROR(dstSize_tooSmall);
seqHead = op; seqHead = op;
{ { size_t const dumpsLength = seqStorePtr->dumps - seqStorePtr->dumpsStart;
size_t const dumpsLength = seqStorePtr->dumps - seqStorePtr->dumpsStart;
if (dumpsLength < 512) { if (dumpsLength < 512) {
op[0] = (BYTE)(dumpsLength >> 8); op[0] = (BYTE)(dumpsLength >> 8);
op[1] = (BYTE)(dumpsLength); op[1] = (BYTE)(dumpsLength);