958 lines
40 KiB
C
958 lines
40 KiB
C
/*
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* Copyright (c) 2016-present, Przemyslaw Skibinski, Yann Collet, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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#include "zstd_opt.h"
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#include "zstd_lazy.h"
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#define ZSTD_LITFREQ_ADD 2
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#define ZSTD_FREQ_DIV 4
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#define ZSTD_MAX_PRICE (1<<30)
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/*-*************************************
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* Price functions for optimal parser
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***************************************/
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static void ZSTD_setLog2Prices(optState_t* optPtr)
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{
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optPtr->log2matchLengthSum = ZSTD_highbit32(optPtr->matchLengthSum+1);
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optPtr->log2litLengthSum = ZSTD_highbit32(optPtr->litLengthSum+1);
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optPtr->log2litSum = ZSTD_highbit32(optPtr->litSum+1);
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optPtr->log2offCodeSum = ZSTD_highbit32(optPtr->offCodeSum+1);
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optPtr->factor = 1 + ((optPtr->litSum>>5) / optPtr->litLengthSum) + ((optPtr->litSum<<1) / (optPtr->litSum + optPtr->matchSum));
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}
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static void ZSTD_rescaleFreqs(optState_t* optPtr, const BYTE* src, size_t srcSize)
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{
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unsigned u;
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optPtr->cachedLiterals = NULL;
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optPtr->cachedPrice = optPtr->cachedLitLength = 0;
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optPtr->staticPrices = 0;
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if (optPtr->litLengthSum == 0) {
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if (srcSize <= 1024) optPtr->staticPrices = 1;
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assert(optPtr->litFreq!=NULL);
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for (u=0; u<=MaxLit; u++)
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optPtr->litFreq[u] = 0;
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for (u=0; u<srcSize; u++)
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optPtr->litFreq[src[u]]++;
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optPtr->litSum = 0;
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optPtr->litLengthSum = MaxLL+1;
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optPtr->matchLengthSum = MaxML+1;
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optPtr->offCodeSum = (MaxOff+1);
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optPtr->matchSum = (ZSTD_LITFREQ_ADD<<Litbits);
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for (u=0; u<=MaxLit; u++) {
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optPtr->litFreq[u] = 1 + (optPtr->litFreq[u]>>ZSTD_FREQ_DIV);
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optPtr->litSum += optPtr->litFreq[u];
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}
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for (u=0; u<=MaxLL; u++)
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optPtr->litLengthFreq[u] = 1;
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for (u=0; u<=MaxML; u++)
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optPtr->matchLengthFreq[u] = 1;
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for (u=0; u<=MaxOff; u++)
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optPtr->offCodeFreq[u] = 1;
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} else {
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optPtr->matchLengthSum = 0;
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optPtr->litLengthSum = 0;
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optPtr->offCodeSum = 0;
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optPtr->matchSum = 0;
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optPtr->litSum = 0;
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for (u=0; u<=MaxLit; u++) {
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optPtr->litFreq[u] = 1 + (optPtr->litFreq[u]>>(ZSTD_FREQ_DIV+1));
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optPtr->litSum += optPtr->litFreq[u];
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}
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for (u=0; u<=MaxLL; u++) {
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optPtr->litLengthFreq[u] = 1 + (optPtr->litLengthFreq[u]>>(ZSTD_FREQ_DIV+1));
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optPtr->litLengthSum += optPtr->litLengthFreq[u];
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}
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for (u=0; u<=MaxML; u++) {
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optPtr->matchLengthFreq[u] = 1 + (optPtr->matchLengthFreq[u]>>ZSTD_FREQ_DIV);
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optPtr->matchLengthSum += optPtr->matchLengthFreq[u];
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optPtr->matchSum += optPtr->matchLengthFreq[u] * (u + 3);
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}
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optPtr->matchSum *= ZSTD_LITFREQ_ADD;
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for (u=0; u<=MaxOff; u++) {
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optPtr->offCodeFreq[u] = 1 + (optPtr->offCodeFreq[u]>>ZSTD_FREQ_DIV);
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optPtr->offCodeSum += optPtr->offCodeFreq[u];
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}
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}
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ZSTD_setLog2Prices(optPtr);
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}
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static U32 ZSTD_getLiteralPrice(optState_t* optPtr, U32 litLength, const BYTE* literals)
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{
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U32 price, u;
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if (optPtr->staticPrices)
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return ZSTD_highbit32((U32)litLength+1) + (litLength*6);
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if (litLength == 0)
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return optPtr->log2litLengthSum - ZSTD_highbit32(optPtr->litLengthFreq[0]+1);
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/* literals */
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if (optPtr->cachedLiterals == literals) {
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U32 const additional = litLength - optPtr->cachedLitLength;
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const BYTE* literals2 = optPtr->cachedLiterals + optPtr->cachedLitLength;
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price = optPtr->cachedPrice + additional * optPtr->log2litSum;
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for (u=0; u < additional; u++)
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price -= ZSTD_highbit32(optPtr->litFreq[literals2[u]]+1);
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optPtr->cachedPrice = price;
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optPtr->cachedLitLength = litLength;
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} else {
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price = litLength * optPtr->log2litSum;
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for (u=0; u < litLength; u++)
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price -= ZSTD_highbit32(optPtr->litFreq[literals[u]]+1);
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if (litLength >= 12) {
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optPtr->cachedLiterals = literals;
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optPtr->cachedPrice = price;
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optPtr->cachedLitLength = litLength;
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}
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}
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/* literal Length */
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{ const BYTE LL_deltaCode = 19;
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const BYTE llCode = (litLength>63) ? (BYTE)ZSTD_highbit32(litLength) + LL_deltaCode : LL_Code[litLength];
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price += LL_bits[llCode] + optPtr->log2litLengthSum - ZSTD_highbit32(optPtr->litLengthFreq[llCode]+1);
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}
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return price;
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}
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FORCE_INLINE_TEMPLATE U32 ZSTD_getPrice(optState_t* optPtr, U32 litLength, const BYTE* literals, U32 offset, U32 matchLength, const int ultra)
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{
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/* offset */
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U32 price;
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BYTE const offCode = (BYTE)ZSTD_highbit32(offset+1);
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if (optPtr->staticPrices)
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return ZSTD_getLiteralPrice(optPtr, litLength, literals) + ZSTD_highbit32((U32)matchLength+1) + 16 + offCode;
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price = offCode + optPtr->log2offCodeSum - ZSTD_highbit32(optPtr->offCodeFreq[offCode]+1);
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if (!ultra && offCode >= 20) price += (offCode-19)*2;
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/* match Length */
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{ const BYTE ML_deltaCode = 36;
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const BYTE mlCode = (matchLength>127) ? (BYTE)ZSTD_highbit32(matchLength) + ML_deltaCode : ML_Code[matchLength];
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price += ML_bits[mlCode] + optPtr->log2matchLengthSum - ZSTD_highbit32(optPtr->matchLengthFreq[mlCode]+1);
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}
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return price + ZSTD_getLiteralPrice(optPtr, litLength, literals) + optPtr->factor;
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}
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static void ZSTD_updatePrice(optState_t* optPtr, U32 litLength, const BYTE* literals, U32 offset, U32 matchLength)
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{
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U32 u;
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/* literals */
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optPtr->litSum += litLength*ZSTD_LITFREQ_ADD;
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for (u=0; u < litLength; u++)
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optPtr->litFreq[literals[u]] += ZSTD_LITFREQ_ADD;
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/* literal Length */
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{ const BYTE LL_deltaCode = 19;
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const BYTE llCode = (litLength>63) ? (BYTE)ZSTD_highbit32(litLength) + LL_deltaCode : LL_Code[litLength];
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optPtr->litLengthFreq[llCode]++;
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optPtr->litLengthSum++;
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}
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/* match offset */
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{ BYTE const offCode = (BYTE)ZSTD_highbit32(offset+1);
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optPtr->offCodeSum++;
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optPtr->offCodeFreq[offCode]++;
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}
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/* match Length */
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{ const BYTE ML_deltaCode = 36;
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const BYTE mlCode = (matchLength>127) ? (BYTE)ZSTD_highbit32(matchLength) + ML_deltaCode : ML_Code[matchLength];
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optPtr->matchLengthFreq[mlCode]++;
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optPtr->matchLengthSum++;
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}
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ZSTD_setLog2Prices(optPtr);
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}
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#define SET_PRICE(pos, mlen_, offset_, litlen_, price_) \
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{ \
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while (last_pos < pos) { opt[last_pos+1].price = ZSTD_MAX_PRICE; last_pos++; } \
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opt[pos].mlen = mlen_; \
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opt[pos].off = offset_; \
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opt[pos].litlen = litlen_; \
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opt[pos].price = price_; \
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}
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/* function safe only for comparisons */
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static U32 ZSTD_readMINMATCH(const void* memPtr, U32 length)
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{
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switch (length)
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{
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default :
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case 4 : return MEM_read32(memPtr);
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case 3 : if (MEM_isLittleEndian())
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return MEM_read32(memPtr)<<8;
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else
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return MEM_read32(memPtr)>>8;
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}
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}
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/* Update hashTable3 up to ip (excluded)
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Assumption : always within prefix (i.e. not within extDict) */
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static
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U32 ZSTD_insertAndFindFirstIndexHash3 (ZSTD_CCtx* zc, const BYTE* ip)
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{
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U32* const hashTable3 = zc->hashTable3;
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U32 const hashLog3 = zc->hashLog3;
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const BYTE* const base = zc->base;
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U32 idx = zc->nextToUpdate3;
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const U32 target = zc->nextToUpdate3 = (U32)(ip - base);
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const size_t hash3 = ZSTD_hash3Ptr(ip, hashLog3);
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while(idx < target) {
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hashTable3[ZSTD_hash3Ptr(base+idx, hashLog3)] = idx;
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idx++;
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}
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return hashTable3[hash3];
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}
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/*-*************************************
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* Binary Tree search
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***************************************/
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static U32 ZSTD_insertBtAndGetAllMatches (
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ZSTD_CCtx* zc,
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const BYTE* const ip, const BYTE* const iLimit,
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U32 nbCompares, const U32 mls,
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U32 extDict, ZSTD_match_t* matches, const U32 minMatchLen)
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{
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const BYTE* const base = zc->base;
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const U32 current = (U32)(ip-base);
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const U32 hashLog = zc->appliedParams.cParams.hashLog;
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const size_t h = ZSTD_hashPtr(ip, hashLog, mls);
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U32* const hashTable = zc->hashTable;
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U32 matchIndex = hashTable[h];
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U32* const bt = zc->chainTable;
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const U32 btLog = zc->appliedParams.cParams.chainLog - 1;
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const U32 btMask= (1U << btLog) - 1;
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size_t commonLengthSmaller=0, commonLengthLarger=0;
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const BYTE* const dictBase = zc->dictBase;
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const U32 dictLimit = zc->dictLimit;
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const BYTE* const dictEnd = dictBase + dictLimit;
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const BYTE* const prefixStart = base + dictLimit;
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const U32 btLow = btMask >= current ? 0 : current - btMask;
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const U32 windowLow = zc->lowLimit;
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U32* smallerPtr = bt + 2*(current&btMask);
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U32* largerPtr = bt + 2*(current&btMask) + 1;
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U32 matchEndIdx = current+8;
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U32 dummy32; /* to be nullified at the end */
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U32 mnum = 0;
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const U32 minMatch = (mls == 3) ? 3 : 4;
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size_t bestLength = minMatchLen-1;
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if (minMatch == 3) { /* HC3 match finder */
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U32 const matchIndex3 = ZSTD_insertAndFindFirstIndexHash3 (zc, ip);
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if (matchIndex3>windowLow && (current - matchIndex3 < (1<<18))) {
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const BYTE* match;
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size_t currentMl=0;
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if ((!extDict) || matchIndex3 >= dictLimit) {
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match = base + matchIndex3;
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if (match[bestLength] == ip[bestLength]) currentMl = ZSTD_count(ip, match, iLimit);
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} else {
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match = dictBase + matchIndex3;
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if (ZSTD_readMINMATCH(match, MINMATCH) == ZSTD_readMINMATCH(ip, MINMATCH)) /* assumption : matchIndex3 <= dictLimit-4 (by table construction) */
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currentMl = ZSTD_count_2segments(ip+MINMATCH, match+MINMATCH, iLimit, dictEnd, prefixStart) + MINMATCH;
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}
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/* save best solution */
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if (currentMl > bestLength) {
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bestLength = currentMl;
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matches[mnum].off = ZSTD_REP_MOVE_OPT + current - matchIndex3;
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matches[mnum].len = (U32)currentMl;
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mnum++;
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if (currentMl > ZSTD_OPT_NUM) goto update;
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if (ip+currentMl == iLimit) goto update; /* best possible, and avoid read overflow*/
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}
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}
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}
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hashTable[h] = current; /* Update Hash Table */
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while (nbCompares-- && (matchIndex > windowLow)) {
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U32* nextPtr = bt + 2*(matchIndex & btMask);
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size_t matchLength = MIN(commonLengthSmaller, commonLengthLarger); /* guaranteed minimum nb of common bytes */
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const BYTE* match;
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if ((!extDict) || (matchIndex+matchLength >= dictLimit)) {
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match = base + matchIndex;
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if (match[matchLength] == ip[matchLength]) {
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matchLength += ZSTD_count(ip+matchLength+1, match+matchLength+1, iLimit) +1;
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}
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} else {
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match = dictBase + matchIndex;
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matchLength += ZSTD_count_2segments(ip+matchLength, match+matchLength, iLimit, dictEnd, prefixStart);
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if (matchIndex+matchLength >= dictLimit)
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match = base + matchIndex; /* to prepare for next usage of match[matchLength] */
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}
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if (matchLength > bestLength) {
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if (matchLength > matchEndIdx - matchIndex) matchEndIdx = matchIndex + (U32)matchLength;
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bestLength = matchLength;
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matches[mnum].off = ZSTD_REP_MOVE_OPT + current - matchIndex;
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matches[mnum].len = (U32)matchLength;
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mnum++;
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if (matchLength > ZSTD_OPT_NUM) break;
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if (ip+matchLength == iLimit) /* equal : no way to know if inf or sup */
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break; /* drop, to guarantee consistency (miss a little bit of compression) */
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}
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if (match[matchLength] < ip[matchLength]) {
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/* match is smaller than current */
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*smallerPtr = matchIndex; /* update smaller idx */
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commonLengthSmaller = matchLength; /* all smaller will now have at least this guaranteed common length */
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if (matchIndex <= btLow) { smallerPtr=&dummy32; break; } /* beyond tree size, stop the search */
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smallerPtr = nextPtr+1; /* new "smaller" => larger of match */
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matchIndex = nextPtr[1]; /* new matchIndex larger than previous (closer to current) */
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} else {
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/* match is larger than current */
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*largerPtr = matchIndex;
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commonLengthLarger = matchLength;
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if (matchIndex <= btLow) { largerPtr=&dummy32; break; } /* beyond tree size, stop the search */
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largerPtr = nextPtr;
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matchIndex = nextPtr[0];
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} }
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*smallerPtr = *largerPtr = 0;
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update:
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zc->nextToUpdate = (matchEndIdx > current + 8) ? matchEndIdx - 8 : current+1;
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return mnum;
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}
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/** Tree updater, providing best match */
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static U32 ZSTD_BtGetAllMatches (
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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, const U32 minMatchLen)
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{
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if (ip < zc->base + zc->nextToUpdate) return 0; /* skipped area */
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ZSTD_updateTree(zc, ip, iLimit, maxNbAttempts, mls);
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return ZSTD_insertBtAndGetAllMatches(zc, ip, iLimit, maxNbAttempts, mls, 0, matches, minMatchLen);
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}
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static U32 ZSTD_BtGetAllMatches_selectMLS (
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ZSTD_CCtx* zc, /* Index table will be updated */
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const BYTE* ip, const BYTE* const iHighLimit,
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const U32 maxNbAttempts, const U32 matchLengthSearch, ZSTD_match_t* matches, const U32 minMatchLen)
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{
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switch(matchLengthSearch)
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{
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case 3 : return ZSTD_BtGetAllMatches(zc, ip, iHighLimit, maxNbAttempts, 3, matches, minMatchLen);
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default :
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case 4 : return ZSTD_BtGetAllMatches(zc, ip, iHighLimit, maxNbAttempts, 4, matches, minMatchLen);
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case 5 : return ZSTD_BtGetAllMatches(zc, ip, iHighLimit, maxNbAttempts, 5, matches, minMatchLen);
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case 7 :
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case 6 : return ZSTD_BtGetAllMatches(zc, ip, iHighLimit, maxNbAttempts, 6, matches, minMatchLen);
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}
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}
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/** Tree updater, providing best match */
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static U32 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, const U32 minMatchLen)
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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, minMatchLen);
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}
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static 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 iHighLimit,
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const U32 maxNbAttempts, const U32 matchLengthSearch, ZSTD_match_t* matches, const U32 minMatchLen)
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{
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switch(matchLengthSearch)
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{
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case 3 : return ZSTD_BtGetAllMatches_extDict(zc, ip, iHighLimit, maxNbAttempts, 3, matches, minMatchLen);
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default :
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case 4 : return ZSTD_BtGetAllMatches_extDict(zc, ip, iHighLimit, maxNbAttempts, 4, matches, minMatchLen);
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case 5 : return ZSTD_BtGetAllMatches_extDict(zc, ip, iHighLimit, maxNbAttempts, 5, matches, minMatchLen);
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case 7 :
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case 6 : return ZSTD_BtGetAllMatches_extDict(zc, ip, iHighLimit, maxNbAttempts, 6, matches, minMatchLen);
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}
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}
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/*-*******************************
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* Optimal parser
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*********************************/
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FORCE_INLINE_TEMPLATE
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size_t ZSTD_compressBlock_opt_generic(ZSTD_CCtx* ctx,
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const void* src, size_t srcSize, const int ultra)
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{
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seqStore_t* seqStorePtr = &(ctx->seqStore);
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optState_t* optStatePtr = &(ctx->optState);
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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 BYTE* const prefixStart = base + ctx->dictLimit;
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const U32 maxSearches = 1U << ctx->appliedParams.cParams.searchLog;
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const U32 sufficient_len = ctx->appliedParams.cParams.targetLength;
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const U32 mls = ctx->appliedParams.cParams.searchLength;
|
|
const U32 minMatch = (ctx->appliedParams.cParams.searchLength == 3) ? 3 : 4;
|
|
|
|
ZSTD_optimal_t* opt = optStatePtr->priceTable;
|
|
ZSTD_match_t* matches = optStatePtr->matchTable;
|
|
const BYTE* inr;
|
|
U32 offset, rep[ZSTD_REP_NUM];
|
|
|
|
/* init */
|
|
ctx->nextToUpdate3 = ctx->nextToUpdate;
|
|
ZSTD_rescaleFreqs(optStatePtr, (const BYTE*)src, srcSize);
|
|
ip += (ip==prefixStart);
|
|
{ U32 i; for (i=0; i<ZSTD_REP_NUM; i++) rep[i]=seqStorePtr->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) ? (rep[0] - 1) : rep[i];
|
|
if ( (repCur > 0) && (repCur < (S32)(ip-prefixStart))
|
|
&& (ZSTD_readMINMATCH(ip, minMatch) == ZSTD_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(optStatePtr, 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(optStatePtr, 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(optStatePtr, litlen, inr-litlen);
|
|
} else
|
|
price = ZSTD_getLiteralPrice(optStatePtr, litlen, anchor);
|
|
} else {
|
|
litlen = 1;
|
|
price = opt[cur - 1].price + ZSTD_getLiteralPrice(optStatePtr, 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];
|
|
/* If opt[cur].off == ZSTD_REP_MOVE_OPT, then mlen != 1.
|
|
* offset ZSTD_REP_MOVE_OPT is used for the special case
|
|
* litLength == 0, where offset 0 means something special.
|
|
* mlen == 1 means the previous byte was stored as a literal,
|
|
* so they are mutually exclusive.
|
|
*/
|
|
assert(!(opt[cur].off == ZSTD_REP_MOVE_OPT && mlen == 1));
|
|
opt[cur].rep[0] = (opt[cur].off == ZSTD_REP_MOVE_OPT) ? (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].rep[0] - 1) : opt[cur].rep[i];
|
|
if ( (repCur > 0) && (repCur < (S32)(inr-prefixStart))
|
|
&& (ZSTD_readMINMATCH(inr, minMatch) == ZSTD_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(optStatePtr, litlen, inr-litlen, best_off, mlen - MINMATCH, ultra);
|
|
} else
|
|
price = ZSTD_getPrice(optStatePtr, litlen, anchor, best_off, mlen - MINMATCH, ultra);
|
|
} else {
|
|
litlen = 0;
|
|
price = opt[cur].price + ZSTD_getPrice(optStatePtr, 0, NULL, best_off, mlen - MINMATCH, ultra);
|
|
}
|
|
|
|
if (cur + mlen > last_pos || price <= opt[cur + mlen].price)
|
|
SET_PRICE(cur + mlen, mlen, i, litlen, price);
|
|
mlen--;
|
|
} while (mlen >= minMatch);
|
|
} } }
|
|
|
|
match_num = ZSTD_BtGetAllMatches_selectMLS(ctx, inr, iend, maxSearches, mls, matches, best_mlen);
|
|
|
|
if (match_num > 0 && (matches[match_num-1].len > sufficient_len || cur + matches[match_num-1].len >= ZSTD_OPT_NUM)) {
|
|
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 (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) {
|
|
if (opt[cur].mlen == 1) {
|
|
litlen = opt[cur].litlen;
|
|
if (cur > litlen)
|
|
price = opt[cur - litlen].price + ZSTD_getPrice(optStatePtr, litlen, ip+cur-litlen, matches[u].off-1, mlen - MINMATCH, ultra);
|
|
else
|
|
price = ZSTD_getPrice(optStatePtr, litlen, anchor, matches[u].off-1, mlen - MINMATCH, ultra);
|
|
} else {
|
|
litlen = 0;
|
|
price = opt[cur].price + ZSTD_getPrice(optStatePtr, 0, NULL, matches[u].off-1, mlen - MINMATCH, ultra);
|
|
}
|
|
|
|
if (cur + mlen > last_pos || (price < opt[cur + mlen].price))
|
|
SET_PRICE(cur + mlen, mlen, matches[u].off, litlen, price);
|
|
|
|
mlen++;
|
|
} } }
|
|
|
|
best_mlen = opt[last_pos].mlen;
|
|
best_off = opt[last_pos].off;
|
|
cur = last_pos - best_mlen;
|
|
|
|
/* store sequence */
|
|
_storeSequence: /* cur, last_pos, best_mlen, best_off have to be set */
|
|
opt[0].mlen = 1;
|
|
|
|
while (1) {
|
|
mlen = opt[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 (u = 0; u <= last_pos;) {
|
|
u += opt[u].mlen;
|
|
}
|
|
|
|
for (cur=0; cur < last_pos; ) {
|
|
mlen = opt[cur].mlen;
|
|
if (mlen == 1) { ip++; cur++; continue; }
|
|
offset = opt[cur].off;
|
|
cur += mlen;
|
|
litLength = (U32)(ip - anchor);
|
|
|
|
if (offset > ZSTD_REP_MOVE_OPT) {
|
|
rep[2] = rep[1];
|
|
rep[1] = rep[0];
|
|
rep[0] = offset - ZSTD_REP_MOVE_OPT;
|
|
offset--;
|
|
} else {
|
|
if (offset != 0) {
|
|
best_off = (offset==ZSTD_REP_MOVE_OPT) ? (rep[0] - 1) : (rep[offset]);
|
|
if (offset != 1) rep[2] = rep[1];
|
|
rep[1] = rep[0];
|
|
rep[0] = best_off;
|
|
}
|
|
if (litLength==0) offset--;
|
|
}
|
|
|
|
ZSTD_updatePrice(optStatePtr, litLength, anchor, offset, mlen-MINMATCH);
|
|
ZSTD_storeSeq(seqStorePtr, litLength, anchor, offset, mlen-MINMATCH);
|
|
anchor = ip = ip + mlen;
|
|
} } /* for (cur=0; cur < last_pos; ) */
|
|
|
|
/* Save reps for next block */
|
|
{ int i; for (i=0; i<ZSTD_REP_NUM; i++) seqStorePtr->repToConfirm[i] = rep[i]; }
|
|
|
|
/* Return the last literals size */
|
|
return iend - anchor;
|
|
}
|
|
|
|
|
|
size_t ZSTD_compressBlock_btopt(ZSTD_CCtx* ctx, const void* src, size_t srcSize)
|
|
{
|
|
return ZSTD_compressBlock_opt_generic(ctx, src, srcSize, 0);
|
|
}
|
|
|
|
size_t ZSTD_compressBlock_btultra(ZSTD_CCtx* ctx, const void* src, size_t srcSize)
|
|
{
|
|
return ZSTD_compressBlock_opt_generic(ctx, src, srcSize, 1);
|
|
}
|
|
|
|
|
|
FORCE_INLINE_TEMPLATE
|
|
size_t ZSTD_compressBlock_opt_extDict_generic(ZSTD_CCtx* ctx,
|
|
const void* src, size_t srcSize, const int ultra)
|
|
{
|
|
seqStore_t* seqStorePtr = &(ctx->seqStore);
|
|
optState_t* optStatePtr = &(ctx->optState);
|
|
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 lowestIndex = ctx->lowLimit;
|
|
const U32 dictLimit = ctx->dictLimit;
|
|
const BYTE* const prefixStart = base + dictLimit;
|
|
const BYTE* const dictBase = ctx->dictBase;
|
|
const BYTE* const dictEnd = dictBase + dictLimit;
|
|
|
|
const U32 maxSearches = 1U << ctx->appliedParams.cParams.searchLog;
|
|
const U32 sufficient_len = ctx->appliedParams.cParams.targetLength;
|
|
const U32 mls = ctx->appliedParams.cParams.searchLength;
|
|
const U32 minMatch = (ctx->appliedParams.cParams.searchLength == 3) ? 3 : 4;
|
|
|
|
ZSTD_optimal_t* opt = optStatePtr->priceTable;
|
|
ZSTD_match_t* matches = optStatePtr->matchTable;
|
|
const BYTE* inr;
|
|
|
|
/* init */
|
|
U32 offset, rep[ZSTD_REP_NUM];
|
|
{ U32 i; for (i=0; i<ZSTD_REP_NUM; i++) rep[i]=seqStorePtr->rep[i]; }
|
|
|
|
ctx->nextToUpdate3 = ctx->nextToUpdate;
|
|
ZSTD_rescaleFreqs(optStatePtr, (const BYTE*)src, srcSize);
|
|
ip += (ip==prefixStart);
|
|
|
|
/* Match Loop */
|
|
while (ip < ilimit) {
|
|
U32 cur, match_num, last_pos, litlen, price;
|
|
U32 u, mlen, best_mlen, best_off, litLength;
|
|
U32 current = (U32)(ip-base);
|
|
memset(opt, 0, sizeof(ZSTD_optimal_t));
|
|
last_pos = 0;
|
|
opt[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) ? (rep[0] - 1) : rep[i];
|
|
const U32 repIndex = (U32)(current - repCur);
|
|
const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
|
|
const BYTE* const repMatch = repBase + repIndex;
|
|
if ( (repCur > 0 && repCur <= (S32)current)
|
|
&& (((U32)((dictLimit-1) - repIndex) >= 3) & (repIndex>lowestIndex)) /* intentional overflow */
|
|
&& (ZSTD_readMINMATCH(ip, minMatch) == ZSTD_readMINMATCH(repMatch, minMatch)) ) {
|
|
/* repcode detected we should take it */
|
|
const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
|
|
mlen = (U32)ZSTD_count_2segments(ip+minMatch, repMatch+minMatch, iend, repEnd, prefixStart) + 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);
|
|
litlen = opt[0].litlen;
|
|
do {
|
|
price = ZSTD_getPrice(optStatePtr, 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_extDict(ctx, ip, iend, maxSearches, mls, matches, minMatch); /* first search (depth 0) */
|
|
|
|
if (!last_pos && !match_num) { ip++; continue; }
|
|
|
|
{ U32 i; for (i=0; i<ZSTD_REP_NUM; i++) opt[0].rep[i] = rep[i]; }
|
|
opt[0].mlen = 1;
|
|
|
|
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;
|
|
}
|
|
|
|
best_mlen = (last_pos) ? last_pos : minMatch;
|
|
|
|
/* set prices using matches at position = 0 */
|
|
for (u = 0; u < match_num; u++) {
|
|
mlen = (u>0) ? matches[u-1].len+1 : best_mlen;
|
|
best_mlen = matches[u].len;
|
|
litlen = opt[0].litlen;
|
|
while (mlen <= best_mlen) {
|
|
price = ZSTD_getPrice(optStatePtr, 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);
|
|
mlen++;
|
|
} }
|
|
|
|
if (last_pos < minMatch) {
|
|
ip++; continue;
|
|
}
|
|
|
|
/* 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(optStatePtr, litlen, inr-litlen);
|
|
} else
|
|
price = ZSTD_getLiteralPrice(optStatePtr, litlen, anchor);
|
|
} else {
|
|
litlen = 1;
|
|
price = opt[cur - 1].price + ZSTD_getLiteralPrice(optStatePtr, 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];
|
|
assert(!(opt[cur].off == ZSTD_REP_MOVE_OPT && mlen == 1));
|
|
opt[cur].rep[0] = (opt[cur].off == ZSTD_REP_MOVE_OPT) ? (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 = (mlen != 1); i<last_i; i++) {
|
|
const S32 repCur = (i==ZSTD_REP_MOVE_OPT) ? (opt[cur].rep[0] - 1) : opt[cur].rep[i];
|
|
const U32 repIndex = (U32)(current+cur - repCur);
|
|
const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
|
|
const BYTE* const repMatch = repBase + repIndex;
|
|
if ( (repCur > 0 && repCur <= (S32)(current+cur))
|
|
&& (((U32)((dictLimit-1) - repIndex) >= 3) & (repIndex>lowestIndex)) /* intentional overflow */
|
|
&& (ZSTD_readMINMATCH(inr, minMatch) == ZSTD_readMINMATCH(repMatch, minMatch)) ) {
|
|
/* repcode detected */
|
|
const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
|
|
mlen = (U32)ZSTD_count_2segments(inr+minMatch, repMatch+minMatch, iend, repEnd, prefixStart) + 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(optStatePtr, litlen, inr-litlen, best_off, mlen - MINMATCH, ultra);
|
|
} else
|
|
price = ZSTD_getPrice(optStatePtr, litlen, anchor, best_off, mlen - MINMATCH, ultra);
|
|
} else {
|
|
litlen = 0;
|
|
price = opt[cur].price + ZSTD_getPrice(optStatePtr, 0, NULL, best_off, mlen - MINMATCH, ultra);
|
|
}
|
|
|
|
if (cur + mlen > last_pos || price <= opt[cur + mlen].price)
|
|
SET_PRICE(cur + mlen, mlen, i, litlen, price);
|
|
mlen--;
|
|
} while (mlen >= minMatch);
|
|
} } }
|
|
|
|
match_num = ZSTD_BtGetAllMatches_selectMLS_extDict(ctx, inr, iend, maxSearches, mls, matches, minMatch);
|
|
|
|
if (match_num > 0 && (matches[match_num-1].len > sufficient_len || cur + matches[match_num-1].len >= ZSTD_OPT_NUM)) {
|
|
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 (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) {
|
|
if (opt[cur].mlen == 1) {
|
|
litlen = opt[cur].litlen;
|
|
if (cur > litlen)
|
|
price = opt[cur - litlen].price + ZSTD_getPrice(optStatePtr, litlen, ip+cur-litlen, matches[u].off-1, mlen - MINMATCH, ultra);
|
|
else
|
|
price = ZSTD_getPrice(optStatePtr, litlen, anchor, matches[u].off-1, mlen - MINMATCH, ultra);
|
|
} else {
|
|
litlen = 0;
|
|
price = opt[cur].price + ZSTD_getPrice(optStatePtr, 0, NULL, matches[u].off-1, mlen - MINMATCH, ultra);
|
|
}
|
|
|
|
if (cur + mlen > last_pos || (price < opt[cur + mlen].price))
|
|
SET_PRICE(cur + mlen, mlen, matches[u].off, litlen, price);
|
|
|
|
mlen++;
|
|
} } } /* for (cur = 1; cur <= last_pos; cur++) */
|
|
|
|
best_mlen = opt[last_pos].mlen;
|
|
best_off = opt[last_pos].off;
|
|
cur = last_pos - best_mlen;
|
|
|
|
/* store sequence */
|
|
_storeSequence: /* cur, last_pos, best_mlen, best_off have to be set */
|
|
opt[0].mlen = 1;
|
|
|
|
while (1) {
|
|
mlen = opt[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 (u = 0; u <= last_pos; ) {
|
|
u += opt[u].mlen;
|
|
}
|
|
|
|
for (cur=0; cur < last_pos; ) {
|
|
mlen = opt[cur].mlen;
|
|
if (mlen == 1) { ip++; cur++; continue; }
|
|
offset = opt[cur].off;
|
|
cur += mlen;
|
|
litLength = (U32)(ip - anchor);
|
|
|
|
if (offset > ZSTD_REP_MOVE_OPT) {
|
|
rep[2] = rep[1];
|
|
rep[1] = rep[0];
|
|
rep[0] = offset - ZSTD_REP_MOVE_OPT;
|
|
offset--;
|
|
} else {
|
|
if (offset != 0) {
|
|
best_off = (offset==ZSTD_REP_MOVE_OPT) ? (rep[0] - 1) : (rep[offset]);
|
|
if (offset != 1) rep[2] = rep[1];
|
|
rep[1] = rep[0];
|
|
rep[0] = best_off;
|
|
}
|
|
|
|
if (litLength==0) offset--;
|
|
}
|
|
|
|
ZSTD_updatePrice(optStatePtr, litLength, anchor, offset, mlen-MINMATCH);
|
|
ZSTD_storeSeq(seqStorePtr, litLength, anchor, offset, mlen-MINMATCH);
|
|
anchor = ip = ip + mlen;
|
|
} } /* for (cur=0; cur < last_pos; ) */
|
|
|
|
/* Save reps for next block */
|
|
{ int i; for (i=0; i<ZSTD_REP_NUM; i++) seqStorePtr->repToConfirm[i] = rep[i]; }
|
|
|
|
/* Return the last literals size */
|
|
return iend - anchor;
|
|
}
|
|
|
|
|
|
size_t ZSTD_compressBlock_btopt_extDict(ZSTD_CCtx* ctx, const void* src, size_t srcSize)
|
|
{
|
|
return ZSTD_compressBlock_opt_extDict_generic(ctx, src, srcSize, 0);
|
|
}
|
|
|
|
size_t ZSTD_compressBlock_btultra_extDict(ZSTD_CCtx* ctx, const void* src, size_t srcSize)
|
|
{
|
|
return ZSTD_compressBlock_opt_extDict_generic(ctx, src, srcSize, 1);
|
|
}
|