diff options
Diffstat (limited to 'thirdparty/zstd/compress/zstd_fast.c')
| -rw-r--r-- | thirdparty/zstd/compress/zstd_fast.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/thirdparty/zstd/compress/zstd_fast.c b/thirdparty/zstd/compress/zstd_fast.c index a05b8a47f1..59267ffbbc 100644 --- a/thirdparty/zstd/compress/zstd_fast.c +++ b/thirdparty/zstd/compress/zstd_fast.c @@ -71,6 +71,7 @@ size_t ZSTD_compressBlock_fast_generic( U32 offsetSaved = 0; /* init */ + DEBUGLOG(5, "ZSTD_compressBlock_fast_generic"); ip0 += (ip0 == prefixStart); ip1 = ip0 + 1; { @@ -239,6 +240,7 @@ size_t ZSTD_compressBlock_fast_dictMatchState_generic( assert(prefixStartIndex >= (U32)(dictEnd - dictBase)); /* init */ + DEBUGLOG(5, "ZSTD_compressBlock_fast_dictMatchState_generic"); ip += (dictAndPrefixLength == 0); /* dictMatchState repCode checks don't currently handle repCode == 0 * disabling. */ @@ -379,9 +381,7 @@ static size_t ZSTD_compressBlock_fast_extDict_generic( const BYTE* ip = istart; const BYTE* anchor = istart; const U32 endIndex = (U32)((size_t)(istart - base) + srcSize); - const U32 maxDistance = 1U << cParams->windowLog; - const U32 validLow = ms->window.lowLimit; - const U32 lowLimit = (endIndex - validLow > maxDistance) ? endIndex - maxDistance : validLow; + const U32 lowLimit = ZSTD_getLowestMatchIndex(ms, endIndex, cParams->windowLog); const U32 dictStartIndex = lowLimit; const BYTE* const dictStart = dictBase + dictStartIndex; const U32 dictLimit = ms->window.dictLimit; @@ -392,6 +392,8 @@ static size_t ZSTD_compressBlock_fast_extDict_generic( const BYTE* const ilimit = iend - 8; U32 offset_1=rep[0], offset_2=rep[1]; + DEBUGLOG(5, "ZSTD_compressBlock_fast_extDict_generic"); + /* switch to "regular" variant if extDict is invalidated due to maxDistance */ if (prefixStartIndex == dictStartIndex) return ZSTD_compressBlock_fast_generic(ms, seqStore, rep, src, srcSize, mls); @@ -412,8 +414,8 @@ static size_t ZSTD_compressBlock_fast_extDict_generic( if ( (((U32)((prefixStartIndex-1) - repIndex) >= 3) /* intentional underflow */ & (repIndex > dictStartIndex)) && (MEM_read32(repMatch) == MEM_read32(ip+1)) ) { - const BYTE* repMatchEnd = repIndex < prefixStartIndex ? dictEnd : iend; - mLength = ZSTD_count_2segments(ip+1+4, repMatch+4, iend, repMatchEnd, prefixStart) + 4; + const BYTE* const repMatchEnd = repIndex < prefixStartIndex ? dictEnd : iend; + mLength = ZSTD_count_2segments(ip+1 +4, repMatch +4, iend, repMatchEnd, prefixStart) + 4; ip++; ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, 0, mLength-MINMATCH); } else { @@ -423,8 +425,8 @@ static size_t ZSTD_compressBlock_fast_extDict_generic( ip += ((ip-anchor) >> kSearchStrength) + stepSize; continue; } - { const BYTE* matchEnd = matchIndex < prefixStartIndex ? dictEnd : iend; - const BYTE* lowMatchPtr = matchIndex < prefixStartIndex ? dictStart : prefixStart; + { const BYTE* const matchEnd = matchIndex < prefixStartIndex ? dictEnd : iend; + const BYTE* const lowMatchPtr = matchIndex < prefixStartIndex ? dictStart : prefixStart; U32 offset; mLength = ZSTD_count_2segments(ip+4, match+4, iend, matchEnd, prefixStart) + 4; while (((ip>anchor) & (match>lowMatchPtr)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */ @@ -451,7 +453,7 @@ static size_t ZSTD_compressBlock_fast_extDict_generic( && (MEM_read32(repMatch2) == MEM_read32(ip)) ) { const BYTE* const repEnd2 = repIndex2 < prefixStartIndex ? dictEnd : iend; size_t const repLength2 = ZSTD_count_2segments(ip+4, repMatch2+4, iend, repEnd2, prefixStart) + 4; - U32 tmpOffset = offset_2; offset_2 = offset_1; offset_1 = tmpOffset; /* swap offset_2 <=> offset_1 */ + U32 const tmpOffset = offset_2; offset_2 = offset_1; offset_1 = tmpOffset; /* swap offset_2 <=> offset_1 */ ZSTD_storeSeq(seqStore, 0, anchor, 0, repLength2-MINMATCH); hashTable[ZSTD_hashPtr(ip, hlog, mls)] = current2; ip += repLength2; |