ddidderr/zstd-rs
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minor optimization for small files

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This commit is contained in:
Yann Collet
2016-01-31 02:04:15 +01:00
parent e93d6ced17
commit 61e16ce07c
4 changed files with 32 additions and 31 deletions
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lib/zstd_compress.c
+8 -15
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@@ -544,10 +544,11 @@ size_t ZSTD_compressSequences(ZSTD_CCtx* zc,
}
/* Sequences Header */
if ((oend-op) < MIN_SEQUENCES_SIZE)
return ERROR(dstSize_tooSmall);
MEM_writeLE16(op, (U16)nbSeq); op+=2;
if ((oend-op) < MIN_SEQUENCES_SIZE) return ERROR(dstSize_tooSmall);
if (nbSeq < 128) *op++ = (BYTE)nbSeq;
else {
op[0] = (nbSeq>>8) + 128; op[1] = (BYTE)nbSeq; op+=2;
}
if (nbSeq==0) goto _check_compressibility;
/* dumps : contains rests of large lengths */
@@ -946,12 +947,7 @@ void ZSTD_compressBlock_fast_generic(ZSTD_CCtx* zc,
/* init */
ZSTD_resetSeqStore(seqStorePtr);
if (ip < lowest+4) {
hashTable[ZSTD_hashPtr(lowest+1, hBits, mls)] = lowIndex+1;
hashTable[ZSTD_hashPtr(lowest+2, hBits, mls)] = lowIndex+2;
hashTable[ZSTD_hashPtr(lowest+3, hBits, mls)] = lowIndex+3;
ip = lowest+4;
}
if (ip < lowest+REPCODE_STARTVALUE) ip = lowest+REPCODE_STARTVALUE;
/* Main Search Loop */
while (ip < ilimit) { /* < instead of <=, because repcode check at (ip+1) */
@@ -1056,12 +1052,9 @@ void ZSTD_compressBlock_fast_extDict_generic(ZSTD_CCtx* ctx,
/* init */
ZSTD_resetSeqStore(seqStorePtr);
/* skip first 4 positions to avoid read overflow during repcode match check */
/* skip first position to avoid read overflow during repcode match check */
hashTable[ZSTD_hashPtr(ip+0, hBits, mls)] = (U32)(ip-base+0);
hashTable[ZSTD_hashPtr(ip+1, hBits, mls)] = (U32)(ip-base+1);
hashTable[ZSTD_hashPtr(ip+2, hBits, mls)] = (U32)(ip-base+2);
hashTable[ZSTD_hashPtr(ip+3, hBits, mls)] = (U32)(ip-base+3);
ip += 4;
ip += REPCODE_STARTVALUE;
/* Main Search Loop */
while (ip < ilimit) { /* < instead of <=, because (ip+1) */