ZSTD_compressBlock_opt_extDict_generic
inikep
parent
e75621f98d
commit
b498fc1c99
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@ -1927,12 +1927,12 @@ static void ZSTD_compressBlock_btlazy2_extDict(ZSTD_CCtx* ctx, const void* src,
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static void ZSTD_compressBlock_opt_extDict(ZSTD_CCtx* ctx, const void* src, size_t srcSize)
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{
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ZSTD_compressBlock_lazy_extDict_generic(ctx, src, srcSize, 0, 2);
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ZSTD_compressBlock_opt_extDict_generic(ctx, src, srcSize, 0, 2);
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}
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static void ZSTD_compressBlock_opt_bt_extDict(ZSTD_CCtx* ctx, const void* src, size_t srcSize)
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{
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ZSTD_compressBlock_lazy_extDict_generic(ctx, src, srcSize, 1, 2);
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ZSTD_compressBlock_opt_extDict_generic(ctx, src, srcSize, 1, 2);
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}
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@ -2106,10 +2106,12 @@ static size_t ZSTD_loadDictionaryContent(ZSTD_CCtx* zc, const void* src, size_t
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case ZSTD_greedy:
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case ZSTD_lazy:
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case ZSTD_lazy2:
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case ZSTD_opt:
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ZSTD_insertAndFindFirstIndex (zc, iend-8, zc->params.searchLength);
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break;
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case ZSTD_btlazy2:
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case ZSTD_opt_bt:
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ZSTD_updateTree(zc, iend-8, iend, 1 << zc->params.searchLog, zc->params.searchLength);
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break;
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486
lib/zstd_opt.c
486
lib/zstd_opt.c
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@ -178,6 +178,9 @@ MEM_STATIC void ZSTD_updatePrice(seqStore_t* seqStorePtr, U32 litLength, const B
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/* *************************************
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* Binary Tree search
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***************************************/
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FORCE_INLINE /* inlining is important to hardwire a hot branch (template emulation) */
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U32 ZSTD_insertBtAndGetAllMatches (
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ZSTD_CCtx* zc,
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@ -298,7 +301,39 @@ FORCE_INLINE U32 ZSTD_BtGetAllMatches_selectMLS (
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}
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}
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/** Tree updater, providing best match */
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FORCE_INLINE /* inlining is important to hardwire a hot branch (template emulation) */
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size_t ZSTD_BtGetAllMatches_extDict (
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ZSTD_CCtx* zc,
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const BYTE* const ip, const BYTE* const iLimit,
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const U32 maxNbAttempts, const U32 mls, ZSTD_match_t* matches, U32 minml)
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{
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if (ip < zc->base + zc->nextToUpdate) return 0; /* skipped area */
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ZSTD_updateTree_extDict(zc, ip, iLimit, maxNbAttempts, mls);
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return ZSTD_insertBtAndGetAllMatches(zc, ip, iLimit, maxNbAttempts, mls, 1, matches, minml);
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}
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FORCE_INLINE U32 ZSTD_BtGetAllMatches_selectMLS_extDict (
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ZSTD_CCtx* zc, /* Index table will be updated */
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const BYTE* ip, const BYTE* const iLowLimit, const BYTE* const iHighLimit,
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const U32 maxNbAttempts, const U32 matchLengthSearch, ZSTD_match_t* matches, U32 minml)
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{
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if (iLowLimit) {}; // skip warnings
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switch(matchLengthSearch)
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{
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default :
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case 4 : return ZSTD_BtGetAllMatches_extDict(zc, ip, iHighLimit, maxNbAttempts, 4, matches, minml);
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case 5 : return ZSTD_BtGetAllMatches_extDict(zc, ip, iHighLimit, maxNbAttempts, 5, matches, minml);
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case 6 : return ZSTD_BtGetAllMatches_extDict(zc, ip, iHighLimit, maxNbAttempts, 6, matches, minml);
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}
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}
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/* ***********************
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* Hash Chain
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*************************/
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FORCE_INLINE /* inlining is important to hardwire a hot branch (template emulation) */
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U32 ZSTD_HcGetAllMatches_generic (
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ZSTD_CCtx* zc, /* Index table will be updated */
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@ -313,6 +348,7 @@ U32 ZSTD_HcGetAllMatches_generic (
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const U32 dictLimit = zc->dictLimit;
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const BYTE* const prefixStart = base + dictLimit;
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const BYTE* const dictEnd = dictBase + dictLimit;
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const BYTE* const dictStart = dictBase + zc->lowLimit;
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const U32 lowLimit = zc->lowLimit;
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const U32 current = (U32)(ip-base);
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const U32 minChain = current > chainSize ? current - chainSize : 0;
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@ -343,7 +379,7 @@ U32 ZSTD_HcGetAllMatches_generic (
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if (MEM_read32(match) == MEM_read32(ip)) /* assumption : matchIndex <= dictLimit-4 (by table construction) */
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currentMl = ZSTD_count_2segments(ip+MINMATCH, match+MINMATCH, iHighLimit, dictEnd, prefixStart) + MINMATCH;
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if (currentMl > 0) {
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while ((match-back > dictBase) && (ip-back > iLowLimit) && (ip[-back-1] == match[-back-1])) back++; /* backward match extension */
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while ((match-back > dictStart) && (ip-back > iLowLimit) && (ip[-back-1] == match[-back-1])) back++; /* backward match extension */
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currentMl += back;
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}
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}
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@ -381,6 +417,19 @@ FORCE_INLINE U32 ZSTD_HcGetAllMatches_selectMLS (
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}
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}
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FORCE_INLINE U32 ZSTD_HcGetAllMatches_selectMLS_extDict (
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ZSTD_CCtx* zc,
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const BYTE* ip, const BYTE* const iLowLimit, const BYTE* const iHighLimit,
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const U32 maxNbAttempts, const U32 matchLengthSearch, ZSTD_match_t* matches, U32 minml)
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{
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switch(matchLengthSearch)
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{
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default :
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case 4 : return ZSTD_HcGetAllMatches_generic(zc, ip, iLowLimit, iHighLimit, maxNbAttempts, 4, 1, matches, minml);
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case 5 : return ZSTD_HcGetAllMatches_generic(zc, ip, iLowLimit, iHighLimit, maxNbAttempts, 5, 1, matches, minml);
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case 6 : return ZSTD_HcGetAllMatches_generic(zc, ip, iLowLimit, iHighLimit, maxNbAttempts, 6, 1, matches, minml);
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}
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}
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/* *******************************
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@ -804,3 +853,438 @@ _storeSequence: // cur, last_pos, best_mlen, best_off have to be set
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FORCE_INLINE
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void ZSTD_compressBlock_opt_extDict_generic(ZSTD_CCtx* ctx,
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const void* src, size_t srcSize,
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const U32 searchMethod, const U32 depth)
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{
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seqStore_t* seqStorePtr = &(ctx->seqStore);
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const BYTE* const istart = (const BYTE*)src;
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const BYTE* ip = istart;
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const BYTE* anchor = istart;
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const BYTE* const iend = istart + srcSize;
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const BYTE* const ilimit = iend - 8;
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const BYTE* const base = ctx->base;
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const U32 dictLimit = ctx->dictLimit;
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const BYTE* const prefixStart = base + dictLimit;
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const BYTE* const dictBase = ctx->dictBase;
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const BYTE* const dictEnd = dictBase + dictLimit;
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U32 rep_2=REPCODE_STARTVALUE, rep_1=REPCODE_STARTVALUE;
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const U32 maxSearches = 1U << ctx->params.searchLog;
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const U32 mls = ctx->params.searchLength;
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typedef U32 (*getAllMatches_f)(ZSTD_CCtx* zc, const BYTE* ip, const BYTE* iLowLimit, const BYTE* iHighLimit,
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U32 maxNbAttempts, U32 matchLengthSearch, ZSTD_match_t* matches, U32 minml);
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getAllMatches_f getAllMatches = searchMethod ? ZSTD_BtGetAllMatches_selectMLS_extDict : ZSTD_HcGetAllMatches_selectMLS_extDict;
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ZSTD_optimal_t opt[ZSTD_OPT_NUM+4];
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ZSTD_match_t matches[ZSTD_OPT_NUM+1];
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const uint8_t *inr;
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U32 skip_num, cur, cur2, match_num, last_pos, litlen, price;
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const U32 sufficient_len = ctx->params.sufficientLength;
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const U32 faster_get_matches = (ctx->params.strategy == ZSTD_opt);
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/* init */
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ZSTD_resetSeqStore(seqStorePtr);
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if ((ip - prefixStart) < REPCODE_STARTVALUE) ip += REPCODE_STARTVALUE;
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/* Match Loop */
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while (ip < ilimit) {
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U32 mlen=0;
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U32 best_mlen=0;
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U32 best_off=0;
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U32 current = (U32)(ip-base);
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memset(opt, 0, sizeof(ZSTD_optimal_t));
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last_pos = 0;
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inr = ip;
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opt[0].litlen = (U32)(ip - anchor);
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/* check repCode */
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{
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const U32 repIndex = (U32)(current+1 - rep_1);
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const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
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const BYTE* const repMatch = repBase + repIndex;
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if ((U32)((dictLimit-1) - repIndex) >= 3) /* intentional overflow */
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if (MEM_read32(ip+1) == MEM_read32(repMatch)) {
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/* repcode detected we should take it */
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const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
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mlen = (U32)ZSTD_count_2segments(ip+1+MINMATCH, repMatch+MINMATCH, iend, repEnd, prefixStart) + MINMATCH;
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ZSTD_LOG_PARSER("%d: start try REP rep=%d mlen=%d\n", (int)(ip-base), (int)rep_1, (int)mlen);
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if (depth==0 || mlen > sufficient_len || mlen >= ZSTD_OPT_NUM) {
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ip+=1; best_mlen = mlen; best_off = 0; cur = 0; last_pos = 1;
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goto _storeSequence;
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}
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litlen = opt[0].litlen + 1;
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do
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{
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price = ZSTD_getPrice(seqStorePtr, litlen, anchor, 0, mlen - MINMATCH);
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if (mlen + 1 > last_pos || price < opt[mlen + 1].price)
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SET_PRICE(mlen + 1, mlen, 0, litlen, price);
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mlen--;
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}
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while (mlen >= MINMATCH);
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}
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}
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best_mlen = (last_pos) ? last_pos : MINMATCH;
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if (faster_get_matches && last_pos)
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match_num = 0;
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else
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match_num = getAllMatches(ctx, ip, ip, iend, maxSearches, mls, matches, best_mlen); /* first search (depth 0) */
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ZSTD_LOG_PARSER("%d: match_num=%d last_pos=%d\n", (int)(ip-base), match_num, last_pos);
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if (!last_pos && !match_num) { ip++; continue; }
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opt[0].rep = rep_1;
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opt[0].rep2 = rep_2;
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opt[0].mlen = 1;
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if (match_num && matches[match_num-1].len > sufficient_len)
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{
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best_mlen = matches[match_num-1].len;
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best_off = matches[match_num-1].off;
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cur = 0;
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last_pos = 1;
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goto _storeSequence;
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}
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// set prices using matches at position = 0
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for (U32 i = 0; i < match_num; i++)
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{
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mlen = (i>0) ? matches[i-1].len+1 : best_mlen;
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best_mlen = (matches[i].len < ZSTD_OPT_NUM) ? matches[i].len : ZSTD_OPT_NUM;
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ZSTD_LOG_PARSER("%d: start Found mlen=%d off=%d best_mlen=%d last_pos=%d\n", (int)(ip-base), matches[i].len, matches[i].off, (int)best_mlen, (int)last_pos);
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litlen = opt[0].litlen;
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while (mlen <= best_mlen)
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{
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price = ZSTD_getPrice(seqStorePtr, litlen, anchor, matches[i].off, mlen - MINMATCH);
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if (mlen > last_pos || price < opt[mlen].price)
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SET_PRICE(mlen, mlen, matches[i].off, litlen, price);
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mlen++;
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}
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}
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if (last_pos < MINMATCH) {
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// ip += ((ip-anchor) >> g_searchStrength) + 1; /* jump faster over incompressible sections */
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ip++; continue;
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}
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// check further positions
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for (skip_num = 0, cur = 1; cur <= last_pos; cur++)
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{
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inr = ip + cur;
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if (opt[cur-1].mlen == 1)
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{
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litlen = opt[cur-1].litlen + 1;
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if (cur > litlen)
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{
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price = opt[cur - litlen].price + ZSTD_getLiteralPrice(seqStorePtr, litlen, inr-litlen);
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ZSTD_LOG_TRY_PRICE("%d: TRY1 opt[%d].price=%d price=%d cur=%d litlen=%d\n", (int)(inr-base), cur - litlen, opt[cur - litlen].price, price, cur, litlen);
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}
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else
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price = ZSTD_getLiteralPrice(seqStorePtr, litlen, anchor);
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}
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else
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{
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litlen = 1;
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price = opt[cur - 1].price + ZSTD_getLiteralPrice(seqStorePtr, litlen, inr-1);
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ZSTD_LOG_TRY_PRICE("%d: TRY3 price=%d cur=%d litlen=%d litonly=%d\n", (int)(inr-base), price, cur, litlen, (int)ZSTD_getLiteralPrice(seqStorePtr, litlen, inr-1));
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}
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ZSTD_LOG_TRY_PRICE("%d: TRY4 price=%d opt[%d].price=%d\n", (int)(inr-base), price, cur, opt[cur].price);
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if (cur > last_pos || price <= opt[cur].price) // || ((price == opt[cur].price) && (opt[cur-1].mlen == 1) && (cur != litlen)))
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SET_PRICE(cur, 1, 0, litlen, price);
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if (cur == last_pos) break;
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if (inr > ilimit) // last match must start at a minimum distance of 8 from oend
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continue;
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mlen = opt[cur].mlen;
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if (opt[cur-mlen].off)
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{
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opt[cur].rep2 = opt[cur-mlen].rep;
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opt[cur].rep = opt[cur-mlen].off;
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ZSTD_LOG_PARSER("%d: COPYREP1 cur=%d mlen=%d rep=%d rep2=%d\n", (int)(inr-base), cur, mlen, opt[cur].rep, opt[cur].rep2);
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}
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else
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{
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if (cur!=mlen && opt[cur-mlen].litlen == 0)
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{
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opt[cur].rep2 = opt[cur-mlen].rep;
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opt[cur].rep = opt[cur-mlen].rep2;
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ZSTD_LOG_PARSER("%d: COPYREP2 cur=%d mlen=%d rep=%d rep2=%d\n", (int)(inr-base), cur, mlen, opt[cur].rep, opt[cur].rep2);
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}
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else
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{
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opt[cur].rep2 = opt[cur-mlen].rep2;
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opt[cur].rep = opt[cur-mlen].rep;
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ZSTD_LOG_PARSER("%d: COPYREP3 cur=%d mlen=%d rep=%d rep2=%d\n", (int)(inr-base), cur, mlen, opt[cur].rep, opt[cur].rep2);
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}
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}
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ZSTD_LOG_PARSER("%d: CURRENT price[%d/%d]=%d off=%d mlen=%d litlen=%d rep=%d rep2=%d\n", (int)(inr-base), cur, last_pos, opt[cur].price, opt[cur].off, opt[cur].mlen, opt[cur].litlen, opt[cur].rep, opt[cur].rep2);
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size_t cur_rep;
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best_mlen = 0;
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if (!opt[cur].off && opt[cur].mlen != 1) {
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cur_rep = opt[cur].rep2;
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ZSTD_LOG_PARSER("%d: try REP2 rep2=%d mlen=%d\n", (int)(inr-base), cur_rep, mlen);
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}
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else {
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cur_rep = opt[cur].rep;
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ZSTD_LOG_PARSER("%d: try REP1 rep=%d mlen=%d\n", (int)(inr-base), cur_rep, mlen);
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}
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const U32 repIndex = (U32)(current+cur - cur_rep);
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const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
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const BYTE* const repMatch = repBase + repIndex;
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if ((U32)((dictLimit-1) - repIndex) >= 3) /* intentional overflow */
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if (MEM_read32(inr) == MEM_read32(repMatch)) {
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/* repcode detected */
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const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
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mlen = (U32)ZSTD_count_2segments(inr+MINMATCH, repMatch+MINMATCH, iend, repEnd, prefixStart) + MINMATCH;
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ZSTD_LOG_PARSER("%d: Found REP mlen=%d off=%d rep=%d opt[%d].off=%d\n", (int)(inr-base), mlen, 0, opt[cur].rep, cur, opt[cur].off);
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if (mlen > sufficient_len || cur + mlen >= ZSTD_OPT_NUM)
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{
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best_mlen = mlen;
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best_off = 0;
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ZSTD_LOG_PARSER("%d: REP sufficient_len=%d best_mlen=%d best_off=%d last_pos=%d\n", (int)(inr-base), sufficient_len, best_mlen, best_off, last_pos);
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last_pos = cur + 1;
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goto _storeSequence;
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}
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if (opt[cur].mlen == 1)
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{
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litlen = opt[cur].litlen;
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if (cur > litlen)
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{
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price = opt[cur - litlen].price + ZSTD_getPrice(seqStorePtr, litlen, inr-litlen, 0, mlen - MINMATCH);
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ZSTD_LOG_TRY_PRICE("%d: TRY5 opt[%d].price=%d price=%d cur=%d litlen=%d\n", (int)(inr-base), cur - litlen, opt[cur - litlen].price, price, cur, litlen);
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}
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else
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price = ZSTD_getPrice(seqStorePtr, litlen, anchor, 0, mlen - MINMATCH);
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}
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else
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{
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litlen = 0;
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price = opt[cur].price + ZSTD_getPrice(seqStorePtr, 0, NULL, 0, mlen - MINMATCH);
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ZSTD_LOG_TRY_PRICE("%d: TRY7 price=%d cur=%d litlen=0 getprice=%d\n", (int)(inr-base), price, cur, (int)ZSTD_getPrice(seqStorePtr, 0, NULL, 0, mlen - MINMATCH));
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}
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best_mlen = mlen;
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if (faster_get_matches)
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skip_num = best_mlen;
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ZSTD_LOG_PARSER("%d: Found REP mlen=%d off=%d price=%d litlen=%d price[%d]=%d\n", (int)(inr-base), mlen, 0, price, litlen, cur - litlen, opt[cur - litlen].price);
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do
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{
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if (cur + mlen > last_pos || price <= opt[cur + mlen].price) // || ((price == opt[cur + mlen].price) && (opt[cur].mlen == 1) && (cur != litlen))) // at equal price prefer REP instead of MATCH
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SET_PRICE(cur + mlen, mlen, 0, litlen, price);
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mlen--;
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}
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while (mlen >= MINMATCH);
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}
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|
||||
if (faster_get_matches && skip_num > 0)
|
||||
{
|
||||
skip_num--;
|
||||
continue;
|
||||
}
|
||||
|
||||
|
||||
best_mlen = (best_mlen > MINMATCH) ? best_mlen : MINMATCH;
|
||||
|
||||
match_num = getAllMatches(ctx, inr, ip, iend, maxSearches, mls, matches, best_mlen);
|
||||
ZSTD_LOG_PARSER("%d: ZSTD_GetAllMatches match_num=%d\n", (int)(inr-base), match_num);
|
||||
|
||||
|
||||
if (match_num > 0 && matches[match_num-1].len > sufficient_len)
|
||||
{
|
||||
cur -= matches[match_num-1].back;
|
||||
best_mlen = matches[match_num-1].len;
|
||||
best_off = matches[match_num-1].off;
|
||||
last_pos = cur + 1;
|
||||
goto _storeSequence;
|
||||
}
|
||||
|
||||
|
||||
// set prices using matches at position = cur
|
||||
for (U32 i = 0; i < match_num; i++)
|
||||
{
|
||||
mlen = (i>0) ? matches[i-1].len+1 : best_mlen;
|
||||
cur2 = cur - matches[i].back;
|
||||
best_mlen = (cur2 + matches[i].len < ZSTD_OPT_NUM) ? matches[i].len : ZSTD_OPT_NUM - cur2;
|
||||
|
||||
ZSTD_LOG_PARSER("%d: Found1 cur=%d cur2=%d mlen=%d off=%d best_mlen=%d last_pos=%d\n", (int)(inr-base), cur, cur2, matches[i].len, matches[i].off, best_mlen, last_pos);
|
||||
if (mlen < matches[i].back + 1)
|
||||
mlen = matches[i].back + 1;
|
||||
|
||||
while (mlen <= best_mlen)
|
||||
{
|
||||
if (opt[cur2].mlen == 1)
|
||||
{
|
||||
litlen = opt[cur2].litlen;
|
||||
if (cur2 > litlen)
|
||||
price = opt[cur2 - litlen].price + ZSTD_getPrice(seqStorePtr, litlen, ip+cur2-litlen, matches[i].off, mlen - MINMATCH);
|
||||
else
|
||||
price = ZSTD_getPrice(seqStorePtr, litlen, anchor, matches[i].off, mlen - MINMATCH);
|
||||
}
|
||||
else
|
||||
{
|
||||
litlen = 0;
|
||||
price = opt[cur2].price + ZSTD_getPrice(seqStorePtr, 0, NULL, matches[i].off, mlen - MINMATCH);
|
||||
}
|
||||
|
||||
ZSTD_LOG_PARSER("%d: Found2 pred=%d mlen=%d best_mlen=%d off=%d price=%d litlen=%d price[%d]=%d\n", (int)(inr-base), matches[i].back, mlen, best_mlen, matches[i].off, price, litlen, cur - litlen, opt[cur - litlen].price);
|
||||
ZSTD_LOG_TRY_PRICE("%d: TRY8 price=%d opt[%d].price=%d\n", (int)(inr-base), price, cur2 + mlen, opt[cur2 + mlen].price);
|
||||
|
||||
if (cur2 + mlen > last_pos || (price < opt[cur2 + mlen].price))
|
||||
SET_PRICE(cur2 + mlen, mlen, matches[i].off, litlen, price);
|
||||
|
||||
mlen++;
|
||||
}
|
||||
}
|
||||
} // for (skip_num = 0, cur = 1; cur <= last_pos; cur++)
|
||||
|
||||
|
||||
best_mlen = opt[last_pos].mlen;
|
||||
best_off = opt[last_pos].off;
|
||||
cur = last_pos - best_mlen;
|
||||
// printf("%d: start=%d best_mlen=%d best_off=%d cur=%d\n", (int)(ip - base), (int)(start - ip), (int)best_mlen, (int)best_off, cur);
|
||||
|
||||
/* store sequence */
|
||||
_storeSequence: // cur, last_pos, best_mlen, best_off have to be set
|
||||
for (U32 i = 1; i <= last_pos; i++)
|
||||
ZSTD_LOG_PARSER("%d: price[%d/%d]=%d off=%d mlen=%d litlen=%d rep=%d rep2=%d\n", (int)(ip-base+i), i, last_pos, opt[i].price, opt[i].off, opt[i].mlen, opt[i].litlen, opt[i].rep, opt[i].rep2);
|
||||
ZSTD_LOG_PARSER("%d: cur=%d/%d best_mlen=%d best_off=%d rep=%d\n", (int)(ip-base+cur), (int)cur, (int)last_pos, (int)best_mlen, (int)best_off, opt[cur].rep);
|
||||
|
||||
opt[0].mlen = 1;
|
||||
U32 offset;
|
||||
|
||||
while (1)
|
||||
{
|
||||
mlen = opt[cur].mlen;
|
||||
ZSTD_LOG_PARSER("%d: cur=%d mlen=%d\n", (int)(ip-base), cur, mlen);
|
||||
offset = opt[cur].off;
|
||||
opt[cur].mlen = best_mlen;
|
||||
opt[cur].off = best_off;
|
||||
best_mlen = mlen;
|
||||
best_off = offset;
|
||||
if (mlen > cur)
|
||||
break;
|
||||
cur -= mlen;
|
||||
}
|
||||
|
||||
for (U32 i = 0; i <= last_pos;)
|
||||
{
|
||||
ZSTD_LOG_PARSER("%d: price2[%d/%d]=%d off=%d mlen=%d litlen=%d rep=%d rep2=%d\n", (int)(ip-base+i), i, last_pos, opt[i].price, opt[i].off, opt[i].mlen, opt[i].litlen, opt[i].rep, opt[i].rep2);
|
||||
i += opt[i].mlen;
|
||||
}
|
||||
|
||||
cur = 0;
|
||||
|
||||
while (cur < last_pos)
|
||||
{
|
||||
ZSTD_LOG_PARSER("%d: price3[%d/%d]=%d off=%d mlen=%d litlen=%d rep=%d rep2=%d\n", (int)(ip-base+cur), cur, last_pos, opt[cur].price, opt[cur].off, opt[cur].mlen, opt[cur].litlen, opt[cur].rep, opt[cur].rep2);
|
||||
mlen = opt[cur].mlen;
|
||||
if (mlen == 1) { ip++; cur++; continue; }
|
||||
offset = opt[cur].off;
|
||||
cur += mlen;
|
||||
|
||||
|
||||
U32 litLength = (U32)(ip - anchor);
|
||||
ZSTD_LOG_ENCODE("%d/%d: ENCODE1 literals=%d mlen=%d off=%d rep1=%d rep2=%d\n", (int)(ip-base), (int)(iend-base), (int)(litLength), (int)mlen, (int)(offset), (int)rep_1, (int)rep_2);
|
||||
|
||||
if (offset)
|
||||
{
|
||||
rep_2 = rep_1;
|
||||
rep_1 = offset;
|
||||
}
|
||||
else
|
||||
{
|
||||
if (litLength == 0)
|
||||
{
|
||||
best_off = rep_2;
|
||||
rep_2 = rep_1;
|
||||
rep_1 = best_off;
|
||||
}
|
||||
}
|
||||
|
||||
ZSTD_LOG_ENCODE("%d/%d: ENCODE2 literals=%d mlen=%d off=%d rep1=%d rep2=%d\n", (int)(ip-base), (int)(iend-base), (int)(litLength), (int)mlen, (int)(offset), (int)rep_1, (int)rep_2);
|
||||
|
||||
#if ZSTD_OPT_DEBUG >= 5
|
||||
int ml2;
|
||||
if (offset)
|
||||
ml2 = ZSTD_count(ip, ip-offset, iend);
|
||||
else
|
||||
ml2 = ZSTD_count(ip, ip-rep_1, iend);
|
||||
if (ml2 < mlen && ml2 < MINMATCH) {
|
||||
printf("%d: ERROR iend=%d mlen=%d offset=%d ml2=%d\n", (int)(ip - base), (int)(iend - ip), (int)mlen, (int)offset, (int)ml2); exit(0); }
|
||||
if (ip < anchor) {
|
||||
printf("%d: ERROR ip < anchor iend=%d mlen=%d offset=%d\n", (int)(ip - base), (int)(iend - ip), (int)mlen, (int)offset); exit(0); }
|
||||
if (ip - offset < ctx->base) {
|
||||
printf("%d: ERROR ip - offset < base iend=%d mlen=%d offset=%d\n", (int)(ip - base), (int)(iend - ip), (int)mlen, (int)offset); exit(0); }
|
||||
if ((int)offset >= (1 << ctx->params.windowLog)) {
|
||||
printf("%d: offset >= (1 << params.windowLog) iend=%d mlen=%d offset=%d\n", (int)(ip - base), (int)(iend - ip), (int)mlen, (int)offset); exit(0); }
|
||||
if (mlen < MINMATCH) {
|
||||
printf("%d: ERROR mlen < MINMATCH iend=%d mlen=%d offset=%d\n", (int)(ip - base), (int)(iend - ip), (int)mlen, (int)offset); exit(0); }
|
||||
if (ip + mlen > iend) {
|
||||
printf("%d: ERROR ip + mlen >= iend iend=%d mlen=%d offset=%d\n", (int)(ip - base), (int)(iend - ip), (int)mlen, (int)offset); exit(0); }
|
||||
#endif
|
||||
|
||||
ZSTD_updatePrice(seqStorePtr, litLength, anchor, offset, mlen-MINMATCH);
|
||||
ZSTD_storeSeq(seqStorePtr, litLength, anchor, offset, mlen-MINMATCH);
|
||||
anchor = ip = ip + mlen;
|
||||
}
|
||||
|
||||
|
||||
// check immediate repcode
|
||||
while (anchor <= ilimit) {
|
||||
const U32 repIndex = (U32)((anchor-base) - rep_2);
|
||||
const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
|
||||
const BYTE* const repMatch = repBase + repIndex;
|
||||
if ((U32)((dictLimit-1) - repIndex) >= 3) /* intentional overflow */
|
||||
if (MEM_read32(anchor) == MEM_read32(repMatch)) {
|
||||
/* repcode detected we should take it */
|
||||
const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
|
||||
mlen = (U32)ZSTD_count_2segments(anchor+MINMATCH, repMatch+MINMATCH, iend, repEnd, prefixStart) + MINMATCH;
|
||||
offset = rep_2; rep_2 = rep_1; rep_1 = offset; /* swap offset history */
|
||||
ZSTD_LOG_ENCODE("%d/%d: ENCODE REP literals=%d mlen=%d off=%d rep1=%d rep2=%d\n", (int)(anchor-base), (int)(iend-base), (int)(0), (int)best_mlen, (int)(0), (int)rep_1, (int)rep_2);
|
||||
ZSTD_updatePrice(seqStorePtr, 0, anchor, 0, mlen-MINMATCH);
|
||||
ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, mlen-MINMATCH);
|
||||
anchor += mlen;
|
||||
ip = anchor;
|
||||
continue; /* faster when present ... (?) */
|
||||
}
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/* Last Literals */
|
||||
{
|
||||
U32 lastLLSize = (U32)(iend - anchor);
|
||||
ZSTD_LOG_ENCODE("%d: lastLLSize literals=%d\n", (int)(ip-base), (int)(lastLLSize));
|
||||
memcpy(seqStorePtr->lit, anchor, lastLLSize);
|
||||
seqStorePtr->lit += lastLLSize;
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue