diff --git a/lib/zstd_opt.c b/lib/zstd_opt.c index a346a9f5..b945b69e 100644 --- a/lib/zstd_opt.c +++ b/lib/zstd_opt.c @@ -394,152 +394,6 @@ void print_hex_text(uint8_t* buf, int bufsize, int endline) } -/* ******************************* -* Old parser -*********************************/ -FORCE_INLINE -void ZSTD_compressBlock_opt2_generic(ZSTD_CCtx* ctx, - const void* src, size_t srcSize, - const U32 searchMethod, const U32 depth) -{ - seqStore_t* seqStorePtr = &(ctx->seqStore); - const BYTE* const istart = (const BYTE*)src; - const BYTE* ip = istart; - const BYTE* anchor = istart; - const BYTE* const iend = istart + srcSize; - const BYTE* const ilimit = iend - 8; - const BYTE* const base = ctx->base + ctx->dictLimit; - - size_t offset_2=REPCODE_STARTVALUE, offset_1=REPCODE_STARTVALUE; - const U32 maxSearches = 1 << ctx->params.searchLog; - const U32 mls = ctx->params.searchLength; - - typedef size_t (*searchMax_f)(ZSTD_CCtx* zc, const BYTE* ip, const BYTE* iLimit, - size_t* offsetPtr, - U32 maxNbAttempts, U32 matchLengthSearch); - searchMax_f searchMax = searchMethod ? ZSTD_BtFindBestMatch_selectMLS : ZSTD_HcFindBestMatch_selectMLS; - -#if 0 - typedef size_t (*getAllMatches_f)(ZSTD_CCtx* zc, const BYTE* ip, const BYTE* iLimit, - U32 maxNbAttempts, U32 matchLengthSearch, ZSTD_match_t* matches); - getAllMatches_f getAllMatches = searchMethod ? ZSTD_BtGetAllMatches_selectMLS : ZSTD_HcGetAllMatches_selectMLS; - - ZSTD_match_t matches[ZSTD_OPT_NUM+1]; -#endif - - /* init */ - ZSTD_resetSeqStore(seqStorePtr); - if ((ip-base) < REPCODE_STARTVALUE) ip = base + REPCODE_STARTVALUE; - - /* Match Loop */ - while (ip < ilimit) { - size_t matchLength=0; - size_t offset=0; - const BYTE* start=ip+1; - -#define ZSTD_USE_REP -#ifdef ZSTD_USE_REP - /* check repCode */ - if (MEM_read32(start) == MEM_read32(start - offset_1)) { - /* repcode : we take it */ - matchLength = ZSTD_count(start+MINMATCH, start+MINMATCH-offset_1, iend) + MINMATCH; - if (depth==0) goto _storeSequence; - } -#endif - - { - /* first search (depth 0) */ -#if 1 - size_t offsetFound = 99999999; - size_t ml2 = searchMax(ctx, ip, iend, &offsetFound, maxSearches, mls); - if (ml2 > matchLength) - start=ip, matchLength = ml2, offset=offsetFound; -#else - size_t mnum = getAllMatches(ctx, ip, iend, maxSearches, mls, matches); - if (mnum > 0) { - if (matches[mnum-1].len > matchLength) - start=ip, matchLength = matches[mnum-1].len, offset=matches[mnum-1].off; - } -#endif - } - - if (matchLength < MINMATCH) { - // ip += ((ip-anchor) >> g_searchStrength) + 1; /* jump faster over incompressible sections */ - ip++; - continue; - } - -#if 1 - /* let's try to find a better solution */ - if (depth>=1) - while (ip= MINMATCH) && (gain2 > gain1)) - matchLength = mlRep, offset = 0, start = ip; - } -#endif - { - size_t offset2=999999; - size_t ml2 = searchMax(ctx, ip, iend, &offset2, maxSearches, mls); - int gain2 = (int)(ml2*4 - ZSTD_highbit((U32)offset2+1)); /* raw approx */ - int gain1 = (int)(matchLength*4 - ZSTD_highbit((U32)offset+1) + 4); - if ((ml2 >= MINMATCH) && (gain2 > gain1)) { - matchLength = ml2, offset = offset2, start = ip; - continue; /* search a better one */ - } } - - break; /* nothing found : store previous solution */ - } -#endif - - /* store sequence */ -_storeSequence: - - /* catch up */ - if (offset) { - while ((start>anchor) && (start>base+offset) && (start[-1] == start[-1-offset])) /* only search for offset within prefix */ - { start--; matchLength++; } - offset_2 = offset_1; offset_1 = offset; - } - - { - size_t litLength = start - anchor; - ZSTD_LOG_ENCODE("%d/%d: ENCODE literals=%d off=%d mlen=%d offset_1=%d offset_2=%d\n", (int)(ip-base), (int)(iend-base), (int)(litLength), (int)(offset), (int)matchLength, (int)offset_1, (int)offset_2); - ZSTD_storeSeq(seqStorePtr, litLength, anchor, offset, matchLength-MINMATCH); - anchor = ip = start + matchLength; - } - -#ifdef ZSTD_USE_REP /* check immediate repcode */ - while ( (ip <= ilimit) - && (MEM_read32(ip) == MEM_read32(ip - offset_2)) ) { - /* store sequence */ - matchLength = ZSTD_count(ip+MINMATCH, ip+MINMATCH-offset_2, iend); - offset = offset_2; - offset_2 = offset_1; - offset_1 = offset; - ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, matchLength); - ip += matchLength+MINMATCH; - anchor = ip; - continue; /* faster when present ... (?) */ - } -#endif - } - - /* Last Literals */ - { - size_t lastLLSize = iend - anchor; - ZSTD_LOG_ENCODE("%d/%d: ENCODE lastLLSize=%d\n", (int)(ip-base), (int)(iend-base), (int)(lastLLSize)); - memcpy(seqStorePtr->lit, anchor, lastLLSize); - seqStorePtr->lit += lastLLSize; - } -} - - /* *******************************