/**

 * Copyright (c) 2016-present, Przemyslaw Skibinski, Yann Collet, Facebook, Inc.

 * All rights reserved.

 *

 * This source code is licensed under the BSD-style license found in the

 * LICENSE file in the root directory of this source tree. An additional grant

 * of patent rights can be found in the PATENTS file in the same directory.

 */

/* Note : this file is intended to be included within zstd_compress.c */

#ifndef ZSTD_OPT_H_91842398743

#define ZSTD_OPT_H_91842398743

#define ZSTD_FREQ_DIV   5

#define ZSTD_MAX_PRICE  (1<<30)

/*-*************************************

*  Price functions for optimal parser

***************************************/

FORCE_INLINE void ZSTD_setLog2Prices(seqStore_t* ssPtr)

{

    ssPtr->log2matchLengthSum = ZSTD_highbit32(ssPtr->matchLengthSum+1);

    ssPtr->log2litLengthSum = ZSTD_highbit32(ssPtr->litLengthSum+1);

    ssPtr->log2litSum = ZSTD_highbit32(ssPtr->litSum+1);

    ssPtr->log2offCodeSum = ZSTD_highbit32(ssPtr->offCodeSum+1);

    ssPtr->factor = 1 + ((ssPtr->litSum>>5) / ssPtr->litLengthSum) + ((ssPtr->litSum<<1) / (ssPtr->litSum + ssPtr->matchSum));

}

MEM_STATIC void ZSTD_rescaleFreqs(seqStore_t* ssPtr)

{

    unsigned u;

    ssPtr->cachedLiterals = NULL;

    ssPtr->cachedPrice = ssPtr->cachedLitLength = 0;

    if (ssPtr->litLengthSum == 0) {

        ssPtr->litSum = (2<<Litbits);

        ssPtr->litLengthSum = MaxLL+1;

        ssPtr->matchLengthSum = MaxML+1;

        ssPtr->offCodeSum = (MaxOff+1);

        ssPtr->matchSum = (2<<Litbits);

        for (u=0; u<=MaxLit; u++)

            ssPtr->litFreq[u] = 2;

        for (u=0; u<=MaxLL; u++)

            ssPtr->litLengthFreq[u] = 1;

        for (u=0; u<=MaxML; u++)

            ssPtr->matchLengthFreq[u] = 1;

        for (u=0; u<=MaxOff; u++)

            ssPtr->offCodeFreq[u] = 1;

    } else {

        ssPtr->matchLengthSum = 0;

        ssPtr->litLengthSum = 0;

        ssPtr->offCodeSum = 0;

        ssPtr->matchSum = 0;

        ssPtr->litSum = 0;

        for (u=0; u<=MaxLit; u++) {

            ssPtr->litFreq[u] = 1 + (ssPtr->litFreq[u]>>ZSTD_FREQ_DIV);

            ssPtr->litSum += ssPtr->litFreq[u];

        }

        for (u=0; u<=MaxLL; u++) {

            ssPtr->litLengthFreq[u] = 1 + (ssPtr->litLengthFreq[u]>>ZSTD_FREQ_DIV);

            ssPtr->litLengthSum += ssPtr->litLengthFreq[u];

        }

        for (u=0; u<=MaxML; u++) {

            ssPtr->matchLengthFreq[u] = 1 + (ssPtr->matchLengthFreq[u]>>ZSTD_FREQ_DIV);

            ssPtr->matchLengthSum += ssPtr->matchLengthFreq[u];

            ssPtr->matchSum += ssPtr->matchLengthFreq[u] * (u + 3);

        }

        for (u=0; u<=MaxOff; u++) {

            ssPtr->offCodeFreq[u] = 1 + (ssPtr->offCodeFreq[u]>>ZSTD_FREQ_DIV);

            ssPtr->offCodeSum += ssPtr->offCodeFreq[u];

        }

    }

    ZSTD_setLog2Prices(ssPtr);

}

FORCE_INLINE U32 ZSTD_getLiteralPrice(seqStore_t* ssPtr, U32 litLength, const BYTE* literals)

{

    U32 price, u;

    if (litLength == 0)

        return ssPtr->log2litLengthSum - ZSTD_highbit32(ssPtr->litLengthFreq[0]+1);

    /* literals */

    if (ssPtr->cachedLiterals == literals) {

        U32 const additional = litLength - ssPtr->cachedLitLength;

        const BYTE* literals2 = ssPtr->cachedLiterals + ssPtr->cachedLitLength;

        price = ssPtr->cachedPrice + additional * ssPtr->log2litSum;

        for (u=0; u < additional; u++)

            price -= ZSTD_highbit32(ssPtr->litFreq[literals2[u]]+1);

        ssPtr->cachedPrice = price;

        ssPtr->cachedLitLength = litLength;

    } else {

        price = litLength * ssPtr->log2litSum;

        for (u=0; u < litLength; u++)

            price -= ZSTD_highbit32(ssPtr->litFreq[literals[u]]+1);

        if (litLength >= 12) {

            ssPtr->cachedLiterals = literals;

            ssPtr->cachedPrice = price;

            ssPtr->cachedLitLength = litLength;

        }

    }

    /* literal Length */

    {   const BYTE LL_deltaCode = 19;

        const BYTE llCode = (litLength>63) ? (BYTE)ZSTD_highbit32(litLength) + LL_deltaCode : LL_Code[litLength];

        price += LL_bits[llCode] + ssPtr->log2litLengthSum - ZSTD_highbit32(ssPtr->litLengthFreq[llCode]+1);

    }

    return price;

}

FORCE_INLINE U32 ZSTD_getPrice(seqStore_t* seqStorePtr, U32 litLength, const BYTE* literals, U32 offset, U32 matchLength, const int ultra)

{

    /* offset */

    BYTE const offCode = (BYTE)ZSTD_highbit32(offset+1);

    U32 price = offCode + seqStorePtr->log2offCodeSum - ZSTD_highbit32(seqStorePtr->offCodeFreq[offCode]+1);

    if (!ultra && offCode >= 20) price += (offCode-19)*2;

    /* match Length */

    {   const BYTE ML_deltaCode = 36;

        const BYTE mlCode = (matchLength>127) ? (BYTE)ZSTD_highbit32(matchLength) + ML_deltaCode : ML_Code[matchLength];

        price += ML_bits[mlCode] + seqStorePtr->log2matchLengthSum - ZSTD_highbit32(seqStorePtr->matchLengthFreq[mlCode]+1);

    }

    return price + ZSTD_getLiteralPrice(seqStorePtr, litLength, literals) + seqStorePtr->factor;

}

MEM_STATIC void ZSTD_updatePrice(seqStore_t* seqStorePtr, U32 litLength, const BYTE* literals, U32 offset, U32 matchLength)

{

    U32 u;

    /* literals */

    seqStorePtr->litSum += litLength;

    for (u=0; u < litLength; u++)

        seqStorePtr->litFreq[literals[u]]++;

    /* literal Length */

    {   const BYTE LL_deltaCode = 19;

        const BYTE llCode = (litLength>63) ? (BYTE)ZSTD_highbit32(litLength) + LL_deltaCode : LL_Code[litLength];

        seqStorePtr->litLengthFreq[llCode]++;

        seqStorePtr->litLengthSum++;

    }

    /* match offset */

	{   BYTE const offCode = (BYTE)ZSTD_highbit32(offset+1);

		seqStorePtr->offCodeSum++;

		seqStorePtr->offCodeFreq[offCode]++;

	}

    /* match Length */

    {   const BYTE ML_deltaCode = 36;

        const BYTE mlCode = (matchLength>127) ? (BYTE)ZSTD_highbit32(matchLength) + ML_deltaCode : ML_Code[matchLength];

        seqStorePtr->matchLengthFreq[mlCode]++;

        seqStorePtr->matchLengthSum++;

    }

    ZSTD_setLog2Prices(seqStorePtr);

}

#define SET_PRICE(pos, mlen_, offset_, litlen_, price_)   \

    {                                                 \

        while (last_pos < pos)  { opt[last_pos+1].price = ZSTD_MAX_PRICE; last_pos++; } \

        opt[pos].mlen = mlen_;                         \

        opt[pos].off = offset_;                        \

        opt[pos].litlen = litlen_;                     \

        opt[pos].price = price_;                       \

    }

/* Update hashTable3 up to ip (excluded)

   Assumption : always within prefix (ie. not within extDict) */

FORCE_INLINE

U32 ZSTD_insertAndFindFirstIndexHash3 (ZSTD_CCtx* zc, const BYTE* ip)

{

    U32* const hashTable3  = zc->hashTable3;

    U32 const hashLog3  = zc->hashLog3;

    const BYTE* const base = zc->base;

    U32 idx = zc->nextToUpdate3;

    const U32 target = zc->nextToUpdate3 = (U32)(ip - base);

    const size_t hash3 = ZSTD_hash3Ptr(ip, hashLog3);

    while(idx < target) {

        hashTable3[ZSTD_hash3Ptr(base+idx, hashLog3)] = idx;

        idx++;

    }

    return hashTable3[hash3];

}

/*-*************************************

*  Binary Tree search

***************************************/

static U32 ZSTD_insertBtAndGetAllMatches (

                        ZSTD_CCtx* zc,

                        const BYTE* const ip, const BYTE* const iLimit,

                        U32 nbCompares, const U32 mls,

                        U32 extDict, ZSTD_match_t* matches, const U32 minMatchLen)

{

    const BYTE* const base = zc->base;

    const U32 current = (U32)(ip-base);

    const U32 hashLog = zc->params.cParams.hashLog;

    const size_t h  = ZSTD_hashPtr(ip, hashLog, mls);

    U32* const hashTable = zc->hashTable;

    U32 matchIndex  = hashTable[h];

    U32* const bt   = zc->chainTable;

    const U32 btLog = zc->params.cParams.chainLog - 1;

    const U32 btMask= (1U << btLog) - 1;

    size_t commonLengthSmaller=0, commonLengthLarger=0;

    const BYTE* const dictBase = zc->dictBase;

    const U32 dictLimit = zc->dictLimit;

    const BYTE* const dictEnd = dictBase + dictLimit;

    const BYTE* const prefixStart = base + dictLimit;

    const U32 btLow = btMask >= current ? 0 : current - btMask;

    const U32 windowLow = zc->lowLimit;

    U32* smallerPtr = bt + 2*(current&btMask);

    U32* largerPtr  = bt + 2*(current&btMask) + 1;

    U32 matchEndIdx = current+8;

    U32 dummy32;   /* to be nullified at the end */

    U32 mnum = 0;

    const U32 minMatch = (mls == 3) ? 3 : 4;

    size_t bestLength = minMatchLen-1;

    if (minMatch == 3) { /* HC3 match finder */

        U32 const matchIndex3 = ZSTD_insertAndFindFirstIndexHash3 (zc, ip);

        if (matchIndex3>windowLow && (current - matchIndex3 < (1<<18))) {

            const BYTE* match;

            size_t currentMl=0;

            if ((!extDict) || matchIndex3 >= dictLimit) {

                match = base + matchIndex3;

                if (match[bestLength] == ip[bestLength]) currentMl = ZSTD_count(ip, match, iLimit);

            } else {

                match = dictBase + matchIndex3;

                if (MEM_readMINMATCH(match, MINMATCH) == MEM_readMINMATCH(ip, MINMATCH))    /* assumption : matchIndex3 <= dictLimit-4 (by table construction) */

                    currentMl = ZSTD_count_2segments(ip+MINMATCH, match+MINMATCH, iLimit, dictEnd, prefixStart) + MINMATCH;

            }

            /* save best solution */

            if (currentMl > bestLength) {

                bestLength = currentMl;

                matches[mnum].off = ZSTD_REP_MOVE_OPT + current - matchIndex3;

                matches[mnum].len = (U32)currentMl;

                mnum++;

                if (currentMl > ZSTD_OPT_NUM) goto update;

                if (ip+currentMl == iLimit) goto update; /* best possible, and avoid read overflow*/

            }

        }

    }

    hashTable[h] = current;   /* Update Hash Table */

    while (nbCompares-- && (matchIndex > windowLow)) {

        U32* nextPtr = bt + 2*(matchIndex & btMask);

        size_t matchLength = MIN(commonLengthSmaller, commonLengthLarger);   /* guaranteed minimum nb of common bytes */

        const BYTE* match;

        if ((!extDict) || (matchIndex+matchLength >= dictLimit)) {

            match = base + matchIndex;

            if (match[matchLength] == ip[matchLength]) {

                matchLength += ZSTD_count(ip+matchLength+1, match+matchLength+1, iLimit) +1;

            }

        } else {

            match = dictBase + matchIndex;

            matchLength += ZSTD_count_2segments(ip+matchLength, match+matchLength, iLimit, dictEnd, prefixStart);

            if (matchIndex+matchLength >= dictLimit)

                match = base + matchIndex;   /* to prepare for next usage of match[matchLength] */

        }

        if (matchLength > bestLength) {

            if (matchLength > matchEndIdx - matchIndex) matchEndIdx = matchIndex + (U32)matchLength;

            bestLength = matchLength;

            matches[mnum].off = ZSTD_REP_MOVE_OPT + current - matchIndex;

            matches[mnum].len = (U32)matchLength;

            mnum++;

            if (matchLength > ZSTD_OPT_NUM) break;

            if (ip+matchLength == iLimit)   /* equal : no way to know if inf or sup */

                break;   /* drop, to guarantee consistency (miss a little bit of compression) */

        }

        if (match[matchLength] < ip[matchLength]) {

            /* match is smaller than current */

            *smallerPtr = matchIndex;             /* update smaller idx */

            commonLengthSmaller = matchLength;    /* all smaller will now have at least this guaranteed common length */

            if (matchIndex <= btLow) { smallerPtr=&dummy32; break; }   /* beyond tree size, stop the search */

            smallerPtr = nextPtr+1;               /* new "smaller" => larger of match */

            matchIndex = nextPtr[1];              /* new matchIndex larger than previous (closer to current) */

        } else {

            /* match is larger than current */

            *largerPtr = matchIndex;

            commonLengthLarger = matchLength;

            if (matchIndex <= btLow) { largerPtr=&dummy32; break; }   /* beyond tree size, stop the search */

            largerPtr = nextPtr;

            matchIndex = nextPtr[0];

    }   }

    *smallerPtr = *largerPtr = 0;

update:

    zc->nextToUpdate = (matchEndIdx > current + 8) ? matchEndIdx - 8 : current+1;

    return mnum;

}

/** Tree updater, providing best match */

static U32 ZSTD_BtGetAllMatches (

                        ZSTD_CCtx* zc,

                        const BYTE* const ip, const BYTE* const iLimit,

                        const U32 maxNbAttempts, const U32 mls, ZSTD_match_t* matches, const U32 minMatchLen)

{

    if (ip < zc->base + zc->nextToUpdate) return 0;   /* skipped area */

    ZSTD_updateTree(zc, ip, iLimit, maxNbAttempts, mls);

    return ZSTD_insertBtAndGetAllMatches(zc, ip, iLimit, maxNbAttempts, mls, 0, matches, minMatchLen);

}

static U32 ZSTD_BtGetAllMatches_selectMLS (

                        ZSTD_CCtx* zc,   /* Index table will be updated */

                        const BYTE* ip, const BYTE* const iHighLimit,

                        const U32 maxNbAttempts, const U32 matchLengthSearch, ZSTD_match_t* matches, const U32 minMatchLen)

{

    switch(matchLengthSearch)

    {

    case 3 : return ZSTD_BtGetAllMatches(zc, ip, iHighLimit, maxNbAttempts, 3, matches, minMatchLen);

    default :

    case 4 : return ZSTD_BtGetAllMatches(zc, ip, iHighLimit, maxNbAttempts, 4, matches, minMatchLen);

    case 5 : return ZSTD_BtGetAllMatches(zc, ip, iHighLimit, maxNbAttempts, 5, matches, minMatchLen);

    case 6 : return ZSTD_BtGetAllMatches(zc, ip, iHighLimit, maxNbAttempts, 6, matches, minMatchLen);

    }

}

/** Tree updater, providing best match */

static U32 ZSTD_BtGetAllMatches_extDict (

                        ZSTD_CCtx* zc,

                        const BYTE* const ip, const BYTE* const iLimit,

                        const U32 maxNbAttempts, const U32 mls, ZSTD_match_t* matches, const U32 minMatchLen)

{

    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, minMatchLen);

}

static U32 ZSTD_BtGetAllMatches_selectMLS_extDict (

                        ZSTD_CCtx* zc,   /* Index table will be updated */

                        const BYTE* ip, const BYTE* const iHighLimit,

                        const U32 maxNbAttempts, const U32 matchLengthSearch, ZSTD_match_t* matches, const U32 minMatchLen)

{

    switch(matchLengthSearch)

    {

    case 3 : return ZSTD_BtGetAllMatches_extDict(zc, ip, iHighLimit, maxNbAttempts, 3, matches, minMatchLen);

    default :

    case 4 : return ZSTD_BtGetAllMatches_extDict(zc, ip, iHighLimit, maxNbAttempts, 4, matches, minMatchLen);

    case 5 : return ZSTD_BtGetAllMatches_extDict(zc, ip, iHighLimit, maxNbAttempts, 5, matches, minMatchLen);

    case 6 : return ZSTD_BtGetAllMatches_extDict(zc, ip, iHighLimit, maxNbAttempts, 6, matches, minMatchLen);

    }

}

/*-*******************************

*  Optimal parser

*********************************/

FORCE_INLINE

void ZSTD_compressBlock_opt_generic(ZSTD_CCtx* ctx,

                                    const void* src, size_t srcSize, const int ultra)

{

    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 BYTE* const prefixStart = base + ctx->dictLimit;

    const U32 maxSearches = 1U << ctx->params.cParams.searchLog;

    const U32 sufficient_len = ctx->params.cParams.targetLength;

    const U32 mls = ctx->params.cParams.searchLength;

    const U32 minMatch = (ctx->params.cParams.searchLength == 3) ? 3 : 4;

    ZSTD_optimal_t* opt = seqStorePtr->priceTable;

    ZSTD_match_t* matches = seqStorePtr->matchTable;

    const BYTE* inr;

    U32 offset, rep[ZSTD_REP_NUM];

    /* init */

    ctx->nextToUpdate3 = ctx->nextToUpdate;

    ZSTD_rescaleFreqs(seqStorePtr);

    ip += (ip==prefixStart);

    { U32 i; for (i=0; i<ZSTD_REP_NUM; i++) rep[i]=ctx->rep[i]; }

    /* Match Loop */

    while (ip < ilimit) {

        U32 cur, match_num, last_pos, litlen, price;

        U32 u, mlen, best_mlen, best_off, litLength;

        memset(opt, 0, sizeof(ZSTD_optimal_t));

        last_pos = 0;

        litlen = (U32)(ip - anchor);

        /* check repCode */

        {   U32 i, last_i = ZSTD_REP_CHECK + (ip==anchor);

            for (i=(ip == anchor); i<last_i; i++) {

                const S32 repCur = ((i==ZSTD_REP_MOVE_OPT) && (ip==anchor)) ? (rep[0] - 1) : rep[i];

                if ( (repCur > 0) && (repCur < (S32)(ip-prefixStart))

                    && (MEM_readMINMATCH(ip, minMatch) == MEM_readMINMATCH(ip - repCur, minMatch))) {

                    mlen = (U32)ZSTD_count(ip+minMatch, ip+minMatch-repCur, iend) + minMatch;

                    if (mlen > sufficient_len || mlen >= ZSTD_OPT_NUM) {

                        best_mlen = mlen; best_off = i; cur = 0; last_pos = 1;

                        goto _storeSequence;

                    }

                    best_off = i - (ip == anchor);

                    do {

                        price = ZSTD_getPrice(seqStorePtr, litlen, anchor, best_off, mlen - MINMATCH, ultra);

                        if (mlen > last_pos || price < opt[mlen].price)

                            SET_PRICE(mlen, mlen, i, litlen, price);   /* note : macro modifies last_pos */

                        mlen--;

                    } while (mlen >= minMatch);

        }   }   }

        match_num = ZSTD_BtGetAllMatches_selectMLS(ctx, ip, iend, maxSearches, mls, matches, minMatch);

        if (!last_pos && !match_num) { ip++; continue; }

        if (match_num && (matches[match_num-1].len > sufficient_len || matches[match_num-1].len >= ZSTD_OPT_NUM)) {

            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 */

        best_mlen = (last_pos) ? last_pos : minMatch;

        for (u = 0; u < match_num; u++) {

            mlen = (u>0) ? matches[u-1].len+1 : best_mlen;

            best_mlen = matches[u].len;

            while (mlen <= best_mlen) {

                price = ZSTD_getPrice(seqStorePtr, litlen, anchor, matches[u].off-1, mlen - MINMATCH, ultra);

                if (mlen > last_pos || price < opt[mlen].price)

                    SET_PRICE(mlen, mlen, matches[u].off, litlen, price);   /* note : macro modifies last_pos */

                mlen++;

        }   }

        if (last_pos < minMatch) { ip++; continue; }

        /* initialize opt[0] */

        { U32 i ; for (i=0; i<ZSTD_REP_NUM; i++) opt[0].rep[i] = rep[i]; }

        opt[0].mlen = 1;

        opt[0].litlen = litlen;

         /* check further positions */

        for (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);

                } else

                    price = ZSTD_getLiteralPrice(seqStorePtr, litlen, anchor);

           } else {

                litlen = 1;

                price = opt[cur - 1].price + ZSTD_getLiteralPrice(seqStorePtr, litlen, inr-1);

           }

           if (cur > last_pos || price <= opt[cur].price)

                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].off > ZSTD_REP_MOVE_OPT) {

                opt[cur].rep[2] = opt[cur-mlen].rep[1];

                opt[cur].rep[1] = opt[cur-mlen].rep[0];

                opt[cur].rep[0] = opt[cur].off - ZSTD_REP_MOVE_OPT;

           } else {

                opt[cur].rep[2] = (opt[cur].off > 1) ? opt[cur-mlen].rep[1] : opt[cur-mlen].rep[2];

                opt[cur].rep[1] = (opt[cur].off > 0) ? opt[cur-mlen].rep[0] : opt[cur-mlen].rep[1];

                opt[cur].rep[0] = ((opt[cur].off==ZSTD_REP_MOVE_OPT) && (mlen != 1)) ? (opt[cur-mlen].rep[0] - 1) : (opt[cur-mlen].rep[opt[cur].off]);

           }

            best_mlen = minMatch;

            {   U32 i, last_i = ZSTD_REP_CHECK + (mlen != 1);

                for (i=(opt[cur].mlen != 1); i<last_i; i++) {  /* check rep */

                    const S32 repCur = ((i==ZSTD_REP_MOVE_OPT) && (opt[cur].mlen != 1)) ? (opt[cur].rep[0] - 1) : opt[cur].rep[i];

                    if ( (repCur > 0) && (repCur < (S32)(inr-prefixStart))

                       && (MEM_readMINMATCH(inr, minMatch) == MEM_readMINMATCH(inr - repCur, minMatch))) {

                       mlen = (U32)ZSTD_count(inr+minMatch, inr+minMatch - repCur, iend) + minMatch;

                       if (mlen > sufficient_len || cur + mlen >= ZSTD_OPT_NUM) {

                            best_mlen = mlen; best_off = i; last_pos = cur + 1;

                            goto _storeSequence;

                       }

                       best_off = i - (opt[cur].mlen != 1);

                       if (mlen > best_mlen) best_mlen = mlen;

                       do {

                           if (opt[cur].mlen == 1) {

                                litlen = opt[cur].litlen;

                                if (cur > litlen) {

                                    price = opt[cur - litlen].price + ZSTD_getPrice(seqStorePtr, litlen, inr-litlen, best_off, mlen - MINMATCH, ultra);

                                } else

                                    price = ZSTD_getPrice(seqStorePtr, litlen, anchor, best_off, mlen - MINMATCH, ultra);

                            } else {

                                litlen = 0;

                                price = opt[cur].price + ZSTD_getPrice(seqStorePtr, 0, NULL, best_off, mlen - MINMATCH, ultra);

                            }

                            if (cur + mlen > last_pos || price <= opt[cur + mlen].price)