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lz4hc: Cleanup function LZ4HC_compress_hashChain

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remittor 2017-03-07 17:11:48 +03:00
parent 9141ada8de
commit 534f8fa5d6
1 changed files with 17 additions and 7 deletions
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24
lib/lz4hc.c
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@ -398,7 +398,8 @@ _Search3:
if (start2 + ml2 < mflimit)
ml3 = LZ4HC_InsertAndGetWiderMatch(ctx, start2 + ml2 - 3, start2, matchlimit, ml2, &ref3, &start3, maxNbAttempts);
else ml3 = ml2;
else
ml3 = ml2;
if (ml3 == ml2) { /* No better match : 2 sequences to encode */
/* ip & ref are known; Now for ml */
@ -474,12 +475,21 @@ _Search3:
}
/* Encode Last Literals */
{ int lastRun = (int)(iend - anchor);
if ((limit) && (((char*)op - dest) + lastRun + 1 + ((lastRun+255-RUN_MASK)/255) > (U32)maxOutputSize)) return 0; /* Check output limit */
if (lastRun>=(int)RUN_MASK) { *op++=(RUN_MASK<<ML_BITS); lastRun-=RUN_MASK; for(; lastRun > 254 ; lastRun-=255) *op++ = 255; *op++ = (BYTE) lastRun; }
else *op++ = (BYTE)(lastRun<<ML_BITS);
memcpy(op, anchor, iend - anchor);
op += iend-anchor;
{ size_t lastRunSize, litLength, totalSize;
lastRunSize = (size_t)(iend - anchor); /* literals */
litLength = (lastRunSize + 255 - RUN_MASK) / 255;
totalSize = 1 + litLength + lastRunSize;
if ((limit == limitedOutput) && (op + totalSize > oend)) return 0; /* Check output limit */
if (lastRunSize >= RUN_MASK) {
size_t accumulator = lastRunSize - RUN_MASK;
*op++ = (RUN_MASK << ML_BITS);
for(; accumulator >= 255 ; accumulator -= 255) *op++ = 255;
*op++ = (BYTE) accumulator;
} else {
*op++ = (BYTE)(lastRunSize << ML_BITS);
}
memcpy(op, anchor, lastRunSize);
op += lastRunSize;
}
/* End */