diff options
Diffstat (limited to 'thirdparty/zstd/compress/zstd_opt.c')
| -rw-r--r-- | thirdparty/zstd/compress/zstd_opt.c | 38 |
1 files changed, 27 insertions, 11 deletions
diff --git a/thirdparty/zstd/compress/zstd_opt.c b/thirdparty/zstd/compress/zstd_opt.c index 44de6e97fd..efb69d3267 100644 --- a/thirdparty/zstd/compress/zstd_opt.c +++ b/thirdparty/zstd/compress/zstd_opt.c @@ -64,9 +64,15 @@ MEM_STATIC double ZSTD_fCost(U32 price) } #endif +static int ZSTD_compressedLiterals(optState_t const* const optPtr) +{ + return optPtr->literalCompressionMode != ZSTD_lcm_uncompressed; +} + static void ZSTD_setBasePrices(optState_t* optPtr, int optLevel) { - optPtr->litSumBasePrice = WEIGHT(optPtr->litSum, optLevel); + if (ZSTD_compressedLiterals(optPtr)) + optPtr->litSumBasePrice = WEIGHT(optPtr->litSum, optLevel); optPtr->litLengthSumBasePrice = WEIGHT(optPtr->litLengthSum, optLevel); optPtr->matchLengthSumBasePrice = WEIGHT(optPtr->matchLengthSum, optLevel); optPtr->offCodeSumBasePrice = WEIGHT(optPtr->offCodeSum, optLevel); @@ -99,6 +105,7 @@ ZSTD_rescaleFreqs(optState_t* const optPtr, const BYTE* const src, size_t const srcSize, int const optLevel) { + int const compressedLiterals = ZSTD_compressedLiterals(optPtr); DEBUGLOG(5, "ZSTD_rescaleFreqs (srcSize=%u)", (unsigned)srcSize); optPtr->priceType = zop_dynamic; @@ -113,9 +120,10 @@ ZSTD_rescaleFreqs(optState_t* const optPtr, /* huffman table presumed generated by dictionary */ optPtr->priceType = zop_dynamic; - assert(optPtr->litFreq != NULL); - optPtr->litSum = 0; - { unsigned lit; + if (compressedLiterals) { + unsigned lit; + assert(optPtr->litFreq != NULL); + optPtr->litSum = 0; for (lit=0; lit<=MaxLit; lit++) { U32 const scaleLog = 11; /* scale to 2K */ U32 const bitCost = HUF_getNbBits(optPtr->symbolCosts->huf.CTable, lit); @@ -163,10 +171,11 @@ ZSTD_rescaleFreqs(optState_t* const optPtr, } else { /* not a dictionary */ assert(optPtr->litFreq != NULL); - { unsigned lit = MaxLit; + if (compressedLiterals) { + unsigned lit = MaxLit; HIST_count_simple(optPtr->litFreq, &lit, src, srcSize); /* use raw first block to init statistics */ + optPtr->litSum = ZSTD_downscaleStat(optPtr->litFreq, MaxLit, 1); } - optPtr->litSum = ZSTD_downscaleStat(optPtr->litFreq, MaxLit, 1); { unsigned ll; for (ll=0; ll<=MaxLL; ll++) @@ -190,7 +199,8 @@ ZSTD_rescaleFreqs(optState_t* const optPtr, } else { /* new block : re-use previous statistics, scaled down */ - optPtr->litSum = ZSTD_downscaleStat(optPtr->litFreq, MaxLit, 1); + if (compressedLiterals) + optPtr->litSum = ZSTD_downscaleStat(optPtr->litFreq, MaxLit, 1); optPtr->litLengthSum = ZSTD_downscaleStat(optPtr->litLengthFreq, MaxLL, 0); optPtr->matchLengthSum = ZSTD_downscaleStat(optPtr->matchLengthFreq, MaxML, 0); optPtr->offCodeSum = ZSTD_downscaleStat(optPtr->offCodeFreq, MaxOff, 0); @@ -207,6 +217,10 @@ static U32 ZSTD_rawLiteralsCost(const BYTE* const literals, U32 const litLength, int optLevel) { if (litLength == 0) return 0; + + if (!ZSTD_compressedLiterals(optPtr)) + return (litLength << 3) * BITCOST_MULTIPLIER; /* Uncompressed - 8 bytes per literal. */ + if (optPtr->priceType == zop_predef) return (litLength*6) * BITCOST_MULTIPLIER; /* 6 bit per literal - no statistic used */ @@ -310,7 +324,8 @@ static void ZSTD_updateStats(optState_t* const optPtr, U32 offsetCode, U32 matchLength) { /* literals */ - { U32 u; + if (ZSTD_compressedLiterals(optPtr)) { + U32 u; for (u=0; u < litLength; u++) optPtr->litFreq[literals[u]] += ZSTD_LITFREQ_ADD; optPtr->litSum += litLength*ZSTD_LITFREQ_ADD; @@ -870,7 +885,7 @@ ZSTD_compressBlock_opt_generic(ZSTD_matchState_t* ms, /* large match -> immediate encoding */ { U32 const maxML = matches[nbMatches-1].len; U32 const maxOffset = matches[nbMatches-1].off; - DEBUGLOG(6, "found %u matches of maxLength=%u and maxOffCode=%u at cPos=%u => start new serie", + DEBUGLOG(6, "found %u matches of maxLength=%u and maxOffCode=%u at cPos=%u => start new series", nbMatches, maxML, maxOffset, (U32)(ip-prefixStart)); if (maxML > sufficient_len) { @@ -1108,7 +1123,8 @@ static U32 ZSTD_upscaleStat(unsigned* table, U32 lastEltIndex, int bonus) /* used in 2-pass strategy */ MEM_STATIC void ZSTD_upscaleStats(optState_t* optPtr) { - optPtr->litSum = ZSTD_upscaleStat(optPtr->litFreq, MaxLit, 0); + if (ZSTD_compressedLiterals(optPtr)) + optPtr->litSum = ZSTD_upscaleStat(optPtr->litFreq, MaxLit, 0); optPtr->litLengthSum = ZSTD_upscaleStat(optPtr->litLengthFreq, MaxLL, 0); optPtr->matchLengthSum = ZSTD_upscaleStat(optPtr->matchLengthFreq, MaxML, 0); optPtr->offCodeSum = ZSTD_upscaleStat(optPtr->offCodeFreq, MaxOff, 0); @@ -1117,7 +1133,7 @@ MEM_STATIC void ZSTD_upscaleStats(optState_t* optPtr) /* ZSTD_initStats_ultra(): * make a first compression pass, just to seed stats with more accurate starting values. * only works on first block, with no dictionary and no ldm. - * this function cannot error, hence its constract must be respected. + * this function cannot error, hence its contract must be respected. */ static void ZSTD_initStats_ultra(ZSTD_matchState_t* ms, |