-/* *************************************
-* Binary Tree search
-***************************************/
FORCE_INLINE /* inlining is important to hardwire a hot branch (template emulation) */
U32 ZSTD_insertBtAndGetAllMatches (
ZSTD_CCtx* zc,
}
}
-/** Tree updater, providing best match */
-FORCE_INLINE /* inlining is important to hardwire a hot branch (template emulation) */
-size_t ZSTD_BtGetAllMatches_extDict (
- ZSTD_CCtx* zc,
- const BYTE* const ip, const BYTE* const iLimit,
- const U32 maxNbAttempts, const U32 mls, ZSTD_match_t* matches, U32 minml)
-{
- if (ip < zc->base + zc->nextToUpdate) return 0; /* skipped area */
- ZSTD_updateTree_extDict(zc, ip, iLimit, maxNbAttempts, mls);
- return ZSTD_insertBtAndGetAllMatches(zc, ip, iLimit, maxNbAttempts, mls, 1, matches, minml);
-}
-
-
-FORCE_INLINE U32 ZSTD_BtGetAllMatches_selectMLS_extDict (
- ZSTD_CCtx* zc, /* Index table will be updated */
- const BYTE* ip, const BYTE* const iLowLimit, const BYTE* const iHighLimit,
- const U32 maxNbAttempts, const U32 matchLengthSearch, ZSTD_match_t* matches, U32 minml)
-{
- if (iLowLimit) {}; // skip warnings
- switch(matchLengthSearch)
- {
- default :
- case 4 : return ZSTD_BtGetAllMatches_extDict(zc, ip, iHighLimit, maxNbAttempts, 4, matches, minml);
- case 5 : return ZSTD_BtGetAllMatches_extDict(zc, ip, iHighLimit, maxNbAttempts, 5, matches, minml);
- case 6 : return ZSTD_BtGetAllMatches_extDict(zc, ip, iHighLimit, maxNbAttempts, 6, matches, minml);
- }
-}
-
-
-/* ***********************
-* Hash Chain
-*************************/
FORCE_INLINE /* inlining is important to hardwire a hot branch (template emulation) */
U32 ZSTD_HcGetAllMatches_generic (
ZSTD_CCtx* zc, /* Index table will be updated */
const U32 dictLimit = zc->dictLimit;
const BYTE* const prefixStart = base + dictLimit;
const BYTE* const dictEnd = dictBase + dictLimit;
- const BYTE* const dictStart = dictBase + zc->lowLimit;
const U32 lowLimit = zc->lowLimit;
const U32 current = (U32)(ip-base);
const U32 minChain = current > chainSize ? current - chainSize : 0;
if (MEM_read32(match) == MEM_read32(ip)) /* assumption : matchIndex <= dictLimit-4 (by table construction) */
currentMl = ZSTD_count_2segments(ip+MINMATCH, match+MINMATCH, iHighLimit, dictEnd, prefixStart) + MINMATCH;
if (currentMl > 0) {
- while ((match-back > dictStart) && (ip-back > iLowLimit) && (ip[-back-1] == match[-back-1])) back++; /* backward match extension */
+ while ((match-back > dictBase) && (ip-back > iLowLimit) && (ip[-back-1] == match[-back-1])) back++; /* backward match extension */
currentMl += back;
}
}
}
}
-FORCE_INLINE U32 ZSTD_HcGetAllMatches_selectMLS_extDict (
- ZSTD_CCtx* zc,
- const BYTE* ip, const BYTE* const iLowLimit, const BYTE* const iHighLimit,
- const U32 maxNbAttempts, const U32 matchLengthSearch, ZSTD_match_t* matches, U32 minml)
-{
- switch(matchLengthSearch)
- {
- default :
- case 4 : return ZSTD_HcGetAllMatches_generic(zc, ip, iLowLimit, iHighLimit, maxNbAttempts, 4, 1, matches, minml);
- case 5 : return ZSTD_HcGetAllMatches_generic(zc, ip, iLowLimit, iHighLimit, maxNbAttempts, 5, 1, matches, minml);
- case 6 : return ZSTD_HcGetAllMatches_generic(zc, ip, iLowLimit, iHighLimit, maxNbAttempts, 6, 1, matches, minml);
- }
-}
/* *******************************
ZSTD_LOG_PARSER("%d: match_num=%d last_pos=%d\n", (int)(ip-base), match_num, last_pos);
if (!last_pos && !match_num) { ip++; continue; }
- opt[0].rep = rep_1;
- opt[0].rep2 = rep_2;
- opt[0].mlen = 1;
+ opt[0].rep = rep_1;
+ opt[0].rep2 = rep_2;
+ opt[0].mlen = 1;
if (match_num && matches[match_num-1].len > sufficient_len)
{
-FORCE_INLINE
-void ZSTD_compressBlock_opt_extDict_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;
- const U32 dictLimit = ctx->dictLimit;
- const BYTE* const prefixStart = base + dictLimit;
- const BYTE* const dictBase = ctx->dictBase;
- const BYTE* const dictEnd = dictBase + dictLimit;
-
- U32 rep_2=REPCODE_STARTVALUE, rep_1=REPCODE_STARTVALUE;
- const U32 maxSearches = 1U << ctx->params.searchLog;
- const U32 mls = ctx->params.searchLength;
-
- typedef U32 (*getAllMatches_f)(ZSTD_CCtx* zc, const BYTE* ip, const BYTE* iLowLimit, const BYTE* iHighLimit,
- U32 maxNbAttempts, U32 matchLengthSearch, ZSTD_match_t* matches, U32 minml);
- getAllMatches_f getAllMatches = searchMethod ? ZSTD_BtGetAllMatches_selectMLS_extDict : ZSTD_HcGetAllMatches_selectMLS_extDict;
-
- ZSTD_optimal_t opt[ZSTD_OPT_NUM+4];
- ZSTD_match_t matches[ZSTD_OPT_NUM+1];
- const uint8_t *inr;
- U32 skip_num, cur, cur2, match_num, last_pos, litlen, price;
-
- const U32 sufficient_len = ctx->params.sufficientLength;
- const U32 faster_get_matches = (ctx->params.strategy == ZSTD_opt);
-
-
- /* init */
- ZSTD_resetSeqStore(seqStorePtr);
- if ((ip - prefixStart) < REPCODE_STARTVALUE) ip += REPCODE_STARTVALUE;
-
-
- /* Match Loop */
- while (ip < ilimit) {
- U32 mlen=0;
- U32 best_mlen=0;
- U32 best_off=0;
- U32 current = (U32)(ip-base);
- memset(opt, 0, sizeof(ZSTD_optimal_t));
- last_pos = 0;
- inr = ip;
- opt[0].litlen = (U32)(ip - anchor);
-
-
- /* check repCode */
- {
- const U32 repIndex = (U32)(current+1 - rep_1);
- 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(ip+1) == MEM_read32(repMatch)) {
- /* repcode detected we should take it */
- const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
- mlen = (U32)ZSTD_count_2segments(ip+1+MINMATCH, repMatch+MINMATCH, iend, repEnd, prefixStart) + MINMATCH;
-
- ZSTD_LOG_PARSER("%d: start try REP rep=%d mlen=%d\n", (int)(ip-base), (int)rep_1, (int)mlen);
- if (depth==0 || mlen > sufficient_len || mlen >= ZSTD_OPT_NUM) {
- ip+=1; best_mlen = mlen; best_off = 0; cur = 0; last_pos = 1;
- goto _storeSequence;
- }
-
- litlen = opt[0].litlen + 1;
- do
- {
- price = ZSTD_getPrice(seqStorePtr, litlen, anchor, 0, mlen - MINMATCH);
- if (mlen + 1 > last_pos || price < opt[mlen + 1].price)
- SET_PRICE(mlen + 1, mlen, 0, litlen, price);
- mlen--;
- }
- while (mlen >= MINMATCH);
- }
- }
-
- best_mlen = (last_pos) ? last_pos : MINMATCH;
-
- if (faster_get_matches && last_pos)
- match_num = 0;
- else
- match_num = getAllMatches(ctx, ip, ip, iend, maxSearches, mls, matches, best_mlen); /* first search (depth 0) */
-
- ZSTD_LOG_PARSER("%d: match_num=%d last_pos=%d\n", (int)(ip-base), match_num, last_pos);
- if (!last_pos && !match_num) { ip++; continue; }
-
- opt[0].rep = rep_1;
- opt[0].rep2 = rep_2;
- opt[0].mlen = 1;
-
- if (match_num && matches[match_num-1].len > sufficient_len)
- {
- best_mlen = matches[match_num-1].len;
- best_off = matches[match_num-1].off;
- cur = 0;
- last_pos = 1;
- goto _storeSequence;
- }
-
- // set prices using matches at position = 0
- for (U32 i = 0; i < match_num; i++)
- {
- mlen = (i>0) ? matches[i-1].len+1 : best_mlen;
- best_mlen = (matches[i].len < ZSTD_OPT_NUM) ? matches[i].len : ZSTD_OPT_NUM;
- 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);
- litlen = opt[0].litlen;
- while (mlen <= best_mlen)
- {
- price = ZSTD_getPrice(seqStorePtr, litlen, anchor, matches[i].off, mlen - MINMATCH);
- if (mlen > last_pos || price < opt[mlen].price)
- SET_PRICE(mlen, mlen, matches[i].off, litlen, price);
- mlen++;
- }
- }
-
- if (last_pos < MINMATCH) {
- // ip += ((ip-anchor) >> g_searchStrength) + 1; /* jump faster over incompressible sections */
- ip++; continue;
- }
-
-
- // check further positions
- for (skip_num = 0, cur = 1; cur <= last_pos; cur++)
- {
- inr = ip + cur;
-
- if (opt[cur-1].mlen == 1)
- {
- litlen = opt[cur-1].litlen + 1;
- if (cur > litlen)
- {
- price = opt[cur - litlen].price + ZSTD_getLiteralPrice(seqStorePtr, litlen, inr-litlen);
- 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);
- }
- else
- price = ZSTD_getLiteralPrice(seqStorePtr, litlen, anchor);
- }
- else
- {
- litlen = 1;
- price = opt[cur - 1].price + ZSTD_getLiteralPrice(seqStorePtr, litlen, inr-1);
- 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));
- }
-
- ZSTD_LOG_TRY_PRICE("%d: TRY4 price=%d opt[%d].price=%d\n", (int)(inr-base), price, cur, opt[cur].price);
-
- if (cur > last_pos || price <= opt[cur].price) // || ((price == opt[cur].price) && (opt[cur-1].mlen == 1) && (cur != litlen)))
- SET_PRICE(cur, 1, 0, litlen, price);
-
- if (cur == last_pos) break;
-
- if (inr > ilimit) // last match must start at a minimum distance of 8 from oend
- continue;
-
- mlen = opt[cur].mlen;
-
- if (opt[cur-mlen].off)
- {
- opt[cur].rep2 = opt[cur-mlen].rep;
- opt[cur].rep = opt[cur-mlen].off;
- 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);
- }
- else
- {
- if (cur!=mlen && opt[cur-mlen].litlen == 0)
- {
- opt[cur].rep2 = opt[cur-mlen].rep;
- opt[cur].rep = opt[cur-mlen].rep2;
- 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);
- }
- else
- {
- opt[cur].rep2 = opt[cur-mlen].rep2;
- opt[cur].rep = opt[cur-mlen].rep;
- 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);
- }
- }
-
- 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);
-
-
-
- size_t cur_rep;
- best_mlen = 0;
-
- if (!opt[cur].off && opt[cur].mlen != 1) {
- cur_rep = opt[cur].rep2;
- ZSTD_LOG_PARSER("%d: try REP2 rep2=%d mlen=%d\n", (int)(inr-base), cur_rep, mlen);
- }
- else {
- cur_rep = opt[cur].rep;
- ZSTD_LOG_PARSER("%d: try REP1 rep=%d mlen=%d\n", (int)(inr-base), cur_rep, mlen);
- }
-
- const U32 repIndex = (U32)(current+cur - cur_rep);
- 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(inr) == MEM_read32(repMatch)) {
- /* repcode detected */
- const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
- mlen = (U32)ZSTD_count_2segments(inr+MINMATCH, repMatch+MINMATCH, iend, repEnd, prefixStart) + MINMATCH;
- 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);
-
- if (mlen > sufficient_len || cur + mlen >= ZSTD_OPT_NUM)
- {
- best_mlen = mlen;
- best_off = 0;
- 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);
- last_pos = cur + 1;
- goto _storeSequence;
- }
-
- if (opt[cur].mlen == 1)
- {
- litlen = opt[cur].litlen;
-
- if (cur > litlen)
- {
- price = opt[cur - litlen].price + ZSTD_getPrice(seqStorePtr, litlen, inr-litlen, 0, mlen - MINMATCH);
- 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);
- }
- else
- price = ZSTD_getPrice(seqStorePtr, litlen, anchor, 0, mlen - MINMATCH);
- }
- else
- {
- litlen = 0;
- price = opt[cur].price + ZSTD_getPrice(seqStorePtr, 0, NULL, 0, mlen - MINMATCH);
- 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));
- }
-
- best_mlen = mlen;
- if (faster_get_matches)
- skip_num = best_mlen;
-
- 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);
-
- do
- {
- 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
- SET_PRICE(cur + mlen, mlen, 0, litlen, price);
- mlen--;
- }
- while (mlen >= MINMATCH);
- }
-
-
- 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;
- }
-}
projects / thirdparty / zstd.git / commitdiff
