/* * Copyright (c) 2016-2020, Yann Collet, Facebook, Inc. * All rights reserved. * * This source code is licensed under both the BSD-style license (found in the * LICENSE file in the root directory of this source tree) and the GPLv2 (found * in the COPYING file in the root directory of this source tree). * You may select, at your option, one of the above-listed licenses. */ #include "zstd_compress_internal.h" #include "zstd_lazy.h" /*-************************************* * Binary Tree search ***************************************/ static void ZSTD_updateDUBT(ZSTD_matchState_t* ms, const BYTE* ip, const BYTE* iend, U32 mls) { const ZSTD_compressionParameters* const cParams = &ms->cParams; U32* const hashTable = ms->hashTable; U32 const hashLog = cParams->hashLog; U32* const bt = ms->chainTable; U32 const btLog = cParams->chainLog - 1; U32 const btMask = (1 << btLog) - 1; const BYTE* const base = ms->window.base; U32 const target = (U32)(ip - base); U32 idx = ms->nextToUpdate; if (idx != target) DEBUGLOG(7, "ZSTD_updateDUBT, from %u to %u (dictLimit:%u)", idx, target, ms->window.dictLimit); assert(ip + 8 <= iend); /* condition for ZSTD_hashPtr */ (void)iend; assert(idx >= ms->window.dictLimit); /* condition for valid base+idx */ for ( ; idx < target ; idx++) { size_t const h = ZSTD_hashPtr(base + idx, hashLog, mls); /* assumption : ip + 8 <= iend */ U32 const matchIndex = hashTable[h]; U32* const nextCandidatePtr = bt + 2*(idx&btMask); U32* const sortMarkPtr = nextCandidatePtr + 1; DEBUGLOG(8, "ZSTD_updateDUBT: insert %u", idx); hashTable[h] = idx; /* Update Hash Table */ *nextCandidatePtr = matchIndex; /* update BT like a chain */ *sortMarkPtr = ZSTD_DUBT_UNSORTED_MARK; } ms->nextToUpdate = target; } /** ZSTD_insertDUBT1() : * sort one already inserted but unsorted position * assumption : current >= btlow == (current - btmask) * doesn't fail */ static void ZSTD_insertDUBT1(ZSTD_matchState_t* ms, U32 current, const BYTE* inputEnd, U32 nbCompares, U32 btLow, const ZSTD_dictMode_e dictMode) { const ZSTD_compressionParameters* const cParams = &ms->cParams; U32* const bt = ms->chainTable; U32 const btLog = cParams->chainLog - 1; U32 const btMask = (1 << btLog) - 1; size_t commonLengthSmaller=0, commonLengthLarger=0; const BYTE* const base = ms->window.base; const BYTE* const dictBase = ms->window.dictBase; const U32 dictLimit = ms->window.dictLimit; const BYTE* const ip = (current>=dictLimit) ? base + current : dictBase + current; const BYTE* const iend = (current>=dictLimit) ? inputEnd : dictBase + dictLimit; const BYTE* const dictEnd = dictBase + dictLimit; const BYTE* const prefixStart = base + dictLimit; const BYTE* match; U32* smallerPtr = bt + 2*(current&btMask); U32* largerPtr = smallerPtr + 1; U32 matchIndex = *smallerPtr; /* this candidate is unsorted : next sorted candidate is reached through *smallerPtr, while *largerPtr contains previous unsorted candidate (which is already saved and can be overwritten) */ U32 dummy32; /* to be nullified at the end */ U32 const windowValid = ms->window.lowLimit; U32 const maxDistance = 1U << cParams->windowLog; U32 const windowLow = (current - windowValid > maxDistance) ? current - maxDistance : windowValid; DEBUGLOG(8, "ZSTD_insertDUBT1(%u) (dictLimit=%u, lowLimit=%u)", current, dictLimit, windowLow); assert(current >= btLow); assert(ip < iend); /* condition for ZSTD_count */ while (nbCompares-- && (matchIndex > windowLow)) { U32* const nextPtr = bt + 2*(matchIndex & btMask); size_t matchLength = MIN(commonLengthSmaller, commonLengthLarger); /* guaranteed minimum nb of common bytes */ assert(matchIndex < current); /* note : all candidates are now supposed sorted, * but it's still possible to have nextPtr[1] == ZSTD_DUBT_UNSORTED_MARK * when a real index has the same value as ZSTD_DUBT_UNSORTED_MARK */ if ( (dictMode != ZSTD_extDict) || (matchIndex+matchLength >= dictLimit) /* both in current segment*/ || (current < dictLimit) /* both in extDict */) { const BYTE* const mBase = ( (dictMode != ZSTD_extDict) || (matchIndex+matchLength >= dictLimit)) ? base : dictBase; assert( (matchIndex+matchLength >= dictLimit) /* might be wrong if extDict is incorrectly set to 0 */ || (current < dictLimit) ); match = mBase + matchIndex; matchLength += ZSTD_count(ip+matchLength, match+matchLength, iend); } else { match = dictBase + matchIndex; matchLength += ZSTD_count_2segments(ip+matchLength, match+matchLength, iend, dictEnd, prefixStart); if (matchIndex+matchLength >= dictLimit) match = base + matchIndex; /* preparation for next read of match[matchLength] */ } DEBUGLOG(8, "ZSTD_insertDUBT1: comparing %u with %u : found %u common bytes ", current, matchIndex, (U32)matchLength); if (ip+matchLength == iend) { /* equal : no way to know if inf or sup */ break; /* drop , to guarantee consistency ; miss a bit of compression, but other solutions can corrupt tree */ } if (match[matchLength] < ip[matchLength]) { /* necessarily within buffer */ /* 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 searching */ DEBUGLOG(8, "ZSTD_insertDUBT1: %u (>btLow=%u) is smaller : next => %u", matchIndex, btLow, nextPtr[1]); smallerPtr = nextPtr+1; /* new "candidate" => larger than match, which was smaller than target */ matchIndex = nextPtr[1]; /* new matchIndex, larger than previous and closer to current */ } else { /* match is larger than current */ *largerPtr = matchIndex; commonLengthLarger = matchLength; if (matchIndex <= btLow) { largerPtr=&dummy32; break; } /* beyond tree size, stop searching */ DEBUGLOG(8, "ZSTD_insertDUBT1: %u (>btLow=%u) is larger => %u", matchIndex, btLow, nextPtr[0]); largerPtr = nextPtr; matchIndex = nextPtr[0]; } } *smallerPtr = *largerPtr = 0; } static size_t ZSTD_DUBT_findBetterDictMatch ( ZSTD_matchState_t* ms, const BYTE* const ip, const BYTE* const iend, size_t* offsetPtr, size_t bestLength, U32 nbCompares, U32 const mls, const ZSTD_dictMode_e dictMode) { const ZSTD_matchState_t * const dms = ms->dictMatchState; const ZSTD_compressionParameters* const dmsCParams = &dms->cParams; const U32 * const dictHashTable = dms->hashTable; U32 const hashLog = dmsCParams->hashLog; size_t const h = ZSTD_hashPtr(ip, hashLog, mls); U32 dictMatchIndex = dictHashTable[h]; const BYTE* const base = ms->window.base; const BYTE* const prefixStart = base + ms->window.dictLimit; U32 const current = (U32)(ip-base); const BYTE* const dictBase = dms->window.base; const BYTE* const dictEnd = dms->window.nextSrc; U32 const dictHighLimit = (U32)(dms->window.nextSrc - dms->window.base); U32 const dictLowLimit = dms->window.lowLimit; U32 const dictIndexDelta = ms->window.lowLimit - dictHighLimit; U32* const dictBt = dms->chainTable; U32 const btLog = dmsCParams->chainLog - 1; U32 const btMask = (1 << btLog) - 1; U32 const btLow = (btMask >= dictHighLimit - dictLowLimit) ? dictLowLimit : dictHighLimit - btMask; size_t commonLengthSmaller=0, commonLengthLarger=0; (void)dictMode; assert(dictMode == ZSTD_dictMatchState); while (nbCompares-- && (dictMatchIndex > dictLowLimit)) { U32* const nextPtr = dictBt + 2*(dictMatchIndex & btMask); size_t matchLength = MIN(commonLengthSmaller, commonLengthLarger); /* guaranteed minimum nb of common bytes */ const BYTE* match = dictBase + dictMatchIndex; matchLength += ZSTD_count_2segments(ip+matchLength, match+matchLength, iend, dictEnd, prefixStart); if (dictMatchIndex+matchLength >= dictHighLimit) match = base + dictMatchIndex + dictIndexDelta; /* to prepare for next usage of match[matchLength] */ if (matchLength > bestLength) { U32 matchIndex = dictMatchIndex + dictIndexDelta; if ( (4*(int)(matchLength-bestLength)) > (int)(ZSTD_highbit32(current-matchIndex+1) - ZSTD_highbit32((U32)offsetPtr[0]+1)) ) { DEBUGLOG(9, "ZSTD_DUBT_findBetterDictMatch(%u) : found better match length %u -> %u and offsetCode %u -> %u (dictMatchIndex %u, matchIndex %u)", current, (U32)bestLength, (U32)matchLength, (U32)*offsetPtr, ZSTD_REP_MOVE + current - matchIndex, dictMatchIndex, matchIndex); bestLength = matchLength, *offsetPtr = ZSTD_REP_MOVE + current - matchIndex; } if (ip+matchLength == iend) { /* reached end of input : ip[matchLength] is not valid, no way to know if it's larger or smaller than match */ break; /* drop, to guarantee consistency (miss a little bit of compression) */ } } if (match[matchLength] < ip[matchLength]) { if (dictMatchIndex <= btLow) { break; } /* beyond tree size, stop the search */ commonLengthSmaller = matchLength; /* all smaller will now have at least this guaranteed common length */ dictMatchIndex = nextPtr[1]; /* new matchIndex larger than previous (closer to current) */ } else { /* match is larger than current */ if (dictMatchIndex <= btLow) { break; } /* beyond tree size, stop the search */ commonLengthLarger = matchLength; dictMatchIndex = nextPtr[0]; } } if (bestLength >= MINMATCH) { U32 const mIndex = current - ((U32)*offsetPtr - ZSTD_REP_MOVE); (void)mIndex; DEBUGLOG(8, "ZSTD_DUBT_findBetterDictMatch(%u) : found match of length %u and offsetCode %u (pos %u)", current, (U32)bestLength, (U32)*offsetPtr, mIndex); } return bestLength; } static size_t ZSTD_DUBT_findBestMatch(ZSTD_matchState_t* ms, const BYTE* const ip, const BYTE* const iend, size_t* offsetPtr, U32 const mls, const ZSTD_dictMode_e dictMode) { const ZSTD_compressionParameters* const cParams = &ms->cParams; U32* const hashTable = ms->hashTable; U32 const hashLog = cParams->hashLog; size_t const h = ZSTD_hashPtr(ip, hashLog, mls); U32 matchIndex = hashTable[h]; const BYTE* const base = ms->window.base; U32 const current = (U32)(ip-base); U32 const windowLow = ZSTD_getLowestMatchIndex(ms, current, cParams->windowLog); U32* const bt = ms->chainTable; U32 const btLog = cParams->chainLog - 1; U32 const btMask = (1 << btLog) - 1; U32 const btLow = (btMask >= current) ? 0 : current - btMask; U32 const unsortLimit = MAX(btLow, windowLow); U32* nextCandidate = bt + 2*(matchIndex&btMask); U32* unsortedMark = bt + 2*(matchIndex&btMask) + 1; U32 nbCompares = 1U << cParams->searchLog; U32 nbCandidates = nbCompares; U32 previousCandidate = 0; DEBUGLOG(7, "ZSTD_DUBT_findBestMatch (%u) ", current); assert(ip <= iend-8); /* required for h calculation */ /* reach end of unsorted candidates list */ while ( (matchIndex > unsortLimit) && (*unsortedMark == ZSTD_DUBT_UNSORTED_MARK) && (nbCandidates > 1) ) { DEBUGLOG(8, "ZSTD_DUBT_findBestMatch: candidate %u is unsorted", matchIndex); *unsortedMark = previousCandidate; /* the unsortedMark becomes a reversed chain, to move up back to original position */ previousCandidate = matchIndex; matchIndex = *nextCandidate; nextCandidate = bt + 2*(matchIndex&btMask); unsortedMark = bt + 2*(matchIndex&btMask) + 1; nbCandidates --; } /* nullify last candidate if it's still unsorted * simplification, detrimental to compression ratio, beneficial for speed */ if ( (matchIndex > unsortLimit) && (*unsortedMark==ZSTD_DUBT_UNSORTED_MARK) ) { DEBUGLOG(7, "ZSTD_DUBT_findBestMatch: nullify last unsorted candidate %u", matchIndex); *nextCandidate = *unsortedMark = 0; } /* batch sort stacked candidates */ matchIndex = previousCandidate; while (matchIndex) { /* will end on matchIndex == 0 */ U32* const nextCandidateIdxPtr = bt + 2*(matchIndex&btMask) + 1; U32 const nextCandidateIdx = *nextCandidateIdxPtr; ZSTD_insertDUBT1(ms, matchIndex, iend, nbCandidates, unsortLimit, dictMode); matchIndex = nextCandidateIdx; nbCandidates++; } /* find longest match */ { size_t commonLengthSmaller = 0, commonLengthLarger = 0; const BYTE* const dictBase = ms->window.dictBase; const U32 dictLimit = ms->window.dictLimit; const BYTE* const dictEnd = dictBase + dictLimit; const BYTE* const prefixStart = base + dictLimit; U32* smallerPtr = bt + 2*(current&btMask); U32* largerPtr = bt + 2*(current&btMask) + 1; U32 matchEndIdx = current + 8 + 1; U32 dummy32; /* to be nullified at the end */ size_t bestLength = 0; matchIndex = hashTable[h]; hashTable[h] = current; /* Update Hash Table */ while (nbCompares-- && (matchIndex > windowLow)) { U32* const nextPtr = bt + 2*(matchIndex & btMask); size_t matchLength = MIN(commonLengthSmaller, commonLengthLarger); /* guaranteed minimum nb of common bytes */ const BYTE* match; if ((dictMode != ZSTD_extDict) || (matchIndex+matchLength >= dictLimit)) { match = base + matchIndex; matchLength += ZSTD_count(ip+matchLength, match+matchLength, iend); } else { match = dictBase + matchIndex; matchLength += ZSTD_count_2segments(ip+matchLength, match+matchLength, iend, 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; if ( (4*(int)(matchLength-bestLength)) > (int)(ZSTD_highbit32(current-matchIndex+1) - ZSTD_highbit32((U32)offsetPtr[0]+1)) ) bestLength = matchLength, *offsetPtr = ZSTD_REP_MOVE + current - matchIndex; if (ip+matchLength == iend) { /* equal : no way to know if inf or sup */ if (dictMode == ZSTD_dictMatchState) { nbCompares = 0; /* in addition to avoiding checking any * further in this loop, make sure we * skip checking in the dictionary. */ } 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; if (dictMode == ZSTD_dictMatchState && nbCompares) { bestLength = ZSTD_DUBT_findBetterDictMatch( ms, ip, iend, offsetPtr, bestLength, nbCompares, mls, dictMode); } assert(matchEndIdx > current+8); /* ensure nextToUpdate is increased */ ms->nextToUpdate = matchEndIdx - 8; /* skip repetitive patterns */ if (bestLength >= MINMATCH) { U32 const mIndex = current - ((U32)*offsetPtr - ZSTD_REP_MOVE); (void)mIndex; DEBUGLOG(8, "ZSTD_DUBT_findBestMatch(%u) : found match of length %u and offsetCode %u (pos %u)", current, (U32)bestLength, (U32)*offsetPtr, mIndex); } return bestLength; } } /** ZSTD_BtFindBestMatch() : Tree updater, providing best match */ FORCE_INLINE_TEMPLATE size_t ZSTD_BtFindBestMatch( ZSTD_matchState_t* ms, const BYTE* const ip, const BYTE* const iLimit, size_t* offsetPtr, const U32 mls /* template */, const ZSTD_dictMode_e dictMode) { DEBUGLOG(7, "ZSTD_BtFindBestMatch"); if (ip < ms->window.base + ms->nextToUpdate) return 0; /* skipped area */ ZSTD_updateDUBT(ms, ip, iLimit, mls); return ZSTD_DUBT_findBestMatch(ms, ip, iLimit, offsetPtr, mls, dictMode); } static size_t ZSTD_BtFindBestMatch_selectMLS ( ZSTD_matchState_t* ms, const BYTE* ip, const BYTE* const iLimit, size_t* offsetPtr) { switch(ms->cParams.minMatch) { default : /* includes case 3 */ case 4 : return ZSTD_BtFindBestMatch(ms, ip, iLimit, offsetPtr, 4, ZSTD_noDict); case 5 : return ZSTD_BtFindBestMatch(ms, ip, iLimit, offsetPtr, 5, ZSTD_noDict); case 7 : case 6 : return ZSTD_BtFindBestMatch(ms, ip, iLimit, offsetPtr, 6, ZSTD_noDict); } } static size_t ZSTD_BtFindBestMatch_dictMatchState_selectMLS ( ZSTD_matchState_t* ms, const BYTE* ip, const BYTE* const iLimit, size_t* offsetPtr) { switch(ms->cParams.minMatch) { default : /* includes case 3 */ case 4 : return ZSTD_BtFindBestMatch(ms, ip, iLimit, offsetPtr, 4, ZSTD_dictMatchState); case 5 : return ZSTD_BtFindBestMatch(ms, ip, iLimit, offsetPtr, 5, ZSTD_dictMatchState); case 7 : case 6 : return ZSTD_BtFindBestMatch(ms, ip, iLimit, offsetPtr, 6, ZSTD_dictMatchState); } } static size_t ZSTD_BtFindBestMatch_extDict_selectMLS ( ZSTD_matchState_t* ms, const BYTE* ip, const BYTE* const iLimit, size_t* offsetPtr) { switch(ms->cParams.minMatch) { default : /* includes case 3 */ case 4 : return ZSTD_BtFindBestMatch(ms, ip, iLimit, offsetPtr, 4, ZSTD_extDict); case 5 : return ZSTD_BtFindBestMatch(ms, ip, iLimit, offsetPtr, 5, ZSTD_extDict); case 7 : case 6 : return ZSTD_BtFindBestMatch(ms, ip, iLimit, offsetPtr, 6, ZSTD_extDict); } } /* ********************************* * Hash Chain ***********************************/ #define NEXT_IN_CHAIN(d, mask) chainTable[(d) & (mask)] /* Update chains up to ip (excluded) Assumption : always within prefix (i.e. not within extDict) */ static U32 ZSTD_insertAndFindFirstIndex_internal( ZSTD_matchState_t* ms, const ZSTD_compressionParameters* const cParams, const BYTE* ip, U32 const mls) { U32* const hashTable = ms->hashTable; const U32 hashLog = cParams->hashLog; U32* const chainTable = ms->chainTable; const U32 chainMask = (1 << cParams->chainLog) - 1; const BYTE* const base = ms->window.base; const U32 target = (U32)(ip - base); U32 idx = ms->nextToUpdate; while(idx < target) { /* catch up */ size_t const h = ZSTD_hashPtr(base+idx, hashLog, mls); NEXT_IN_CHAIN(idx, chainMask) = hashTable[h]; hashTable[h] = idx; idx++; } ms->nextToUpdate = target; return hashTable[ZSTD_hashPtr(ip, hashLog, mls)]; } U32 ZSTD_insertAndFindFirstIndex(ZSTD_matchState_t* ms, const BYTE* ip) { const ZSTD_compressionParameters* const cParams = &ms->cParams; return ZSTD_insertAndFindFirstIndex_internal(ms, cParams, ip, ms->cParams.minMatch); } /* inlining is important to hardwire a hot branch (template emulation) */ FORCE_INLINE_TEMPLATE size_t ZSTD_HcFindBestMatch_generic ( ZSTD_matchState_t* ms, const BYTE* const ip, const BYTE* const iLimit, size_t* offsetPtr, const U32 mls, const ZSTD_dictMode_e dictMode) { const ZSTD_compressionParameters* const cParams = &ms->cParams; U32* const chainTable = ms->chainTable; const U32 chainSize = (1 << cParams->chainLog); const U32 chainMask = chainSize-1; const BYTE* const base = ms->window.base; const BYTE* const dictBase = ms->window.dictBase; const U32 dictLimit = ms->window.dictLimit; const BYTE* const prefixStart = base + dictLimit; const BYTE* const dictEnd = dictBase + dictLimit; const U32 current = (U32)(ip-base); const U32 maxDistance = 1U << cParams->windowLog; const U32 lowestValid = ms->window.lowLimit; const U32 withinMaxDistance = (current - lowestValid > maxDistance) ? current - maxDistance : lowestValid; const U32 isDictionary = (ms->loadedDictEnd != 0); const U32 lowLimit = isDictionary ? lowestValid : withinMaxDistance; const U32 minChain = current > chainSize ? current - chainSize : 0; U32 nbAttempts = 1U << cParams->searchLog; size_t ml=4-1; /* HC4 match finder */ U32 matchIndex = ZSTD_insertAndFindFirstIndex_internal(ms, cParams, ip, mls); for ( ; (matchIndex>lowLimit) & (nbAttempts>0) ; nbAttempts--) { size_t currentMl=0; if ((dictMode != ZSTD_extDict) || matchIndex >= dictLimit) { const BYTE* const match = base + matchIndex; assert(matchIndex >= dictLimit); /* ensures this is true if dictMode != ZSTD_extDict */ if (match[ml] == ip[ml]) /* potentially better */ currentMl = ZSTD_count(ip, match, iLimit); } else { const BYTE* const match = dictBase + matchIndex; assert(match+4 <= dictEnd); if (MEM_read32(match) == MEM_read32(ip)) /* assumption : matchIndex <= dictLimit-4 (by table construction) */ currentMl = ZSTD_count_2segments(ip+4, match+4, iLimit, dictEnd, prefixStart) + 4; } /* save best solution */ if (currentMl > ml) { ml = currentMl; *offsetPtr = current - matchIndex + ZSTD_REP_MOVE; if (ip+currentMl == iLimit) break; /* best possible, avoids read overflow on next attempt */ } if (matchIndex <= minChain) break; matchIndex = NEXT_IN_CHAIN(matchIndex, chainMask); } if (dictMode == ZSTD_dictMatchState) { const ZSTD_matchState_t* const dms = ms->dictMatchState; const U32* const dmsChainTable = dms->chainTable; const U32 dmsChainSize = (1 << dms->cParams.chainLog); const U32 dmsChainMask = dmsChainSize - 1; const U32 dmsLowestIndex = dms->window.dictLimit; const BYTE* const dmsBase = dms->window.base; const BYTE* const dmsEnd = dms->window.nextSrc; const U32 dmsSize = (U32)(dmsEnd - dmsBase); const U32 dmsIndexDelta = dictLimit - dmsSize; const U32 dmsMinChain = dmsSize > dmsChainSize ? dmsSize - dmsChainSize : 0; matchIndex = dms->hashTable[ZSTD_hashPtr(ip, dms->cParams.hashLog, mls)]; for ( ; (matchIndex>dmsLowestIndex) & (nbAttempts>0) ; nbAttempts--) { size_t currentMl=0; const BYTE* const match = dmsBase + matchIndex; assert(match+4 <= dmsEnd); if (MEM_read32(match) == MEM_read32(ip)) /* assumption : matchIndex <= dictLimit-4 (by table construction) */ currentMl = ZSTD_count_2segments(ip+4, match+4, iLimit, dmsEnd, prefixStart) + 4; /* save best solution */ if (currentMl > ml) { ml = currentMl; *offsetPtr = current - (matchIndex + dmsIndexDelta) + ZSTD_REP_MOVE; if (ip+currentMl == iLimit) break; /* best possible, avoids read overflow on next attempt */ } if (matchIndex <= dmsMinChain) break; matchIndex = dmsChainTable[matchIndex & dmsChainMask]; } } return ml; } FORCE_INLINE_TEMPLATE size_t ZSTD_HcFindBestMatch_selectMLS ( ZSTD_matchState_t* ms, const BYTE* ip, const BYTE* const iLimit, size_t* offsetPtr) { switch(ms->cParams.minMatch) { default : /* includes case 3 */ case 4 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 4, ZSTD_noDict); case 5 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 5, ZSTD_noDict); case 7 : case 6 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 6, ZSTD_noDict); } } static size_t ZSTD_HcFindBestMatch_dictMatchState_selectMLS ( ZSTD_matchState_t* ms, const BYTE* ip, const BYTE* const iLimit, size_t* offsetPtr) { switch(ms->cParams.minMatch) { default : /* includes case 3 */ case 4 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 4, ZSTD_dictMatchState); case 5 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 5, ZSTD_dictMatchState); case 7 : case 6 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 6, ZSTD_dictMatchState); } } FORCE_INLINE_TEMPLATE size_t ZSTD_HcFindBestMatch_extDict_selectMLS ( ZSTD_matchState_t* ms, const BYTE* ip, const BYTE* const iLimit, size_t* offsetPtr) { switch(ms->cParams.minMatch) { default : /* includes case 3 */ case 4 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 4, ZSTD_extDict); case 5 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 5, ZSTD_extDict); case 7 : case 6 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 6, ZSTD_extDict); } } /* ******************************* * Common parser - lazy strategy *********************************/ typedef enum { search_hashChain, search_binaryTree } searchMethod_e; FORCE_INLINE_TEMPLATE size_t ZSTD_compressBlock_lazy_generic( ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], const void* src, size_t srcSize, const searchMethod_e searchMethod, const U32 depth, ZSTD_dictMode_e const dictMode) { 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 = ms->window.base; const U32 prefixLowestIndex = ms->window.dictLimit; const BYTE* const prefixLowest = base + prefixLowestIndex; typedef size_t (*searchMax_f)( ZSTD_matchState_t* ms, const BYTE* ip, const BYTE* iLimit, size_t* offsetPtr); searchMax_f const searchMax = dictMode == ZSTD_dictMatchState ? (searchMethod==search_binaryTree ? ZSTD_BtFindBestMatch_dictMatchState_selectMLS : ZSTD_HcFindBestMatch_dictMatchState_selectMLS) : (searchMethod==search_binaryTree ? ZSTD_BtFindBestMatch_selectMLS : ZSTD_HcFindBestMatch_selectMLS); U32 offset_1 = rep[0], offset_2 = rep[1], savedOffset=0; const ZSTD_matchState_t* const dms = ms->dictMatchState; const U32 dictLowestIndex = dictMode == ZSTD_dictMatchState ? dms->window.dictLimit : 0; const BYTE* const dictBase = dictMode == ZSTD_dictMatchState ? dms->window.base : NULL; const BYTE* const dictLowest = dictMode == ZSTD_dictMatchState ? dictBase + dictLowestIndex : NULL; const BYTE* const dictEnd = dictMode == ZSTD_dictMatchState ? dms->window.nextSrc : NULL; const U32 dictIndexDelta = dictMode == ZSTD_dictMatchState ? prefixLowestIndex - (U32)(dictEnd - dictBase) : 0; const U32 dictAndPrefixLength = (U32)((ip - prefixLowest) + (dictEnd - dictLowest)); DEBUGLOG(5, "ZSTD_compressBlock_lazy_generic (dictMode=%u)", (U32)dictMode); /* init */ ip += (dictAndPrefixLength == 0); if (dictMode == ZSTD_noDict) { U32 const current = (U32)(ip - base); U32 const windowLow = ZSTD_getLowestPrefixIndex(ms, current, ms->cParams.windowLog); U32 const maxRep = current - windowLow; if (offset_2 > maxRep) savedOffset = offset_2, offset_2 = 0; if (offset_1 > maxRep) savedOffset = offset_1, offset_1 = 0; } if (dictMode == ZSTD_dictMatchState) { /* dictMatchState repCode checks don't currently handle repCode == 0 * disabling. */ assert(offset_1 <= dictAndPrefixLength); assert(offset_2 <= dictAndPrefixLength); } /* Match Loop */ #if defined(__GNUC__) && defined(__x86_64__) /* I've measured random a 5% speed loss on levels 5 & 6 (greedy) when the * code alignment is perturbed. To fix the instability align the loop on 32-bytes. */ __asm__(".p2align 5"); #endif while (ip < ilimit) { size_t matchLength=0; size_t offset=0; const BYTE* start=ip+1; /* check repCode */ if (dictMode == ZSTD_dictMatchState) { const U32 repIndex = (U32)(ip - base) + 1 - offset_1; const BYTE* repMatch = (dictMode == ZSTD_dictMatchState && repIndex < prefixLowestIndex) ? dictBase + (repIndex - dictIndexDelta) : base + repIndex; if (((U32)((prefixLowestIndex-1) - repIndex) >= 3 /* intentional underflow */) && (MEM_read32(repMatch) == MEM_read32(ip+1)) ) { const BYTE* repMatchEnd = repIndex < prefixLowestIndex ? dictEnd : iend; matchLength = ZSTD_count_2segments(ip+1+4, repMatch+4, iend, repMatchEnd, prefixLowest) + 4; if (depth==0) goto _storeSequence; } } if ( dictMode == ZSTD_noDict && ((offset_1 > 0) & (MEM_read32(ip+1-offset_1) == MEM_read32(ip+1)))) { matchLength = ZSTD_count(ip+1+4, ip+1+4-offset_1, iend) + 4; if (depth==0) goto _storeSequence; } /* first search (depth 0) */ { size_t offsetFound = 999999999; size_t const ml2 = searchMax(ms, ip, iend, &offsetFound); if (ml2 > matchLength) matchLength = ml2, start = ip, offset=offsetFound; } if (matchLength < 4) { ip += ((ip-anchor) >> kSearchStrength) + 1; /* jump faster over incompressible sections */ continue; } /* let's try to find a better solution */ if (depth>=1) while (ip0) & (MEM_read32(ip) == MEM_read32(ip - offset_1)))) { size_t const mlRep = ZSTD_count(ip+4, ip+4-offset_1, iend) + 4; int const gain2 = (int)(mlRep * 3); int const gain1 = (int)(matchLength*3 - ZSTD_highbit32((U32)offset+1) + 1); if ((mlRep >= 4) && (gain2 > gain1)) matchLength = mlRep, offset = 0, start = ip; } if (dictMode == ZSTD_dictMatchState) { const U32 repIndex = (U32)(ip - base) - offset_1; const BYTE* repMatch = repIndex < prefixLowestIndex ? dictBase + (repIndex - dictIndexDelta) : base + repIndex; if (((U32)((prefixLowestIndex-1) - repIndex) >= 3 /* intentional underflow */) && (MEM_read32(repMatch) == MEM_read32(ip)) ) { const BYTE* repMatchEnd = repIndex < prefixLowestIndex ? dictEnd : iend; size_t const mlRep = ZSTD_count_2segments(ip+4, repMatch+4, iend, repMatchEnd, prefixLowest) + 4; int const gain2 = (int)(mlRep * 3); int const gain1 = (int)(matchLength*3 - ZSTD_highbit32((U32)offset+1) + 1); if ((mlRep >= 4) && (gain2 > gain1)) matchLength = mlRep, offset = 0, start = ip; } } { size_t offset2=999999999; size_t const ml2 = searchMax(ms, ip, iend, &offset2); int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)offset2+1)); /* raw approx */ int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 4); if ((ml2 >= 4) && (gain2 > gain1)) { matchLength = ml2, offset = offset2, start = ip; continue; /* search a better one */ } } /* let's find an even better one */ if ((depth==2) && (ip0) & (MEM_read32(ip) == MEM_read32(ip - offset_1)))) { size_t const mlRep = ZSTD_count(ip+4, ip+4-offset_1, iend) + 4; int const gain2 = (int)(mlRep * 4); int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 1); if ((mlRep >= 4) && (gain2 > gain1)) matchLength = mlRep, offset = 0, start = ip; } if (dictMode == ZSTD_dictMatchState) { const U32 repIndex = (U32)(ip - base) - offset_1; const BYTE* repMatch = repIndex < prefixLowestIndex ? dictBase + (repIndex - dictIndexDelta) : base + repIndex; if (((U32)((prefixLowestIndex-1) - repIndex) >= 3 /* intentional underflow */) && (MEM_read32(repMatch) == MEM_read32(ip)) ) { const BYTE* repMatchEnd = repIndex < prefixLowestIndex ? dictEnd : iend; size_t const mlRep = ZSTD_count_2segments(ip+4, repMatch+4, iend, repMatchEnd, prefixLowest) + 4; int const gain2 = (int)(mlRep * 4); int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 1); if ((mlRep >= 4) && (gain2 > gain1)) matchLength = mlRep, offset = 0, start = ip; } } { size_t offset2=999999999; size_t const ml2 = searchMax(ms, ip, iend, &offset2); int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)offset2+1)); /* raw approx */ int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 7); if ((ml2 >= 4) && (gain2 > gain1)) { matchLength = ml2, offset = offset2, start = ip; continue; } } } break; /* nothing found : store previous solution */ } /* NOTE: * start[-offset+ZSTD_REP_MOVE-1] is undefined behavior. * (-offset+ZSTD_REP_MOVE-1) is unsigned, and is added to start, which * overflows the pointer, which is undefined behavior. */ /* catch up */ if (offset) { if (dictMode == ZSTD_noDict) { while ( ((start > anchor) & (start - (offset-ZSTD_REP_MOVE) > prefixLowest)) && (start[-1] == (start-(offset-ZSTD_REP_MOVE))[-1]) ) /* only search for offset within prefix */ { start--; matchLength++; } } if (dictMode == ZSTD_dictMatchState) { U32 const matchIndex = (U32)((start-base) - (offset - ZSTD_REP_MOVE)); const BYTE* match = (matchIndex < prefixLowestIndex) ? dictBase + matchIndex - dictIndexDelta : base + matchIndex; const BYTE* const mStart = (matchIndex < prefixLowestIndex) ? dictLowest : prefixLowest; while ((start>anchor) && (match>mStart) && (start[-1] == match[-1])) { start--; match--; matchLength++; } /* catch up */ } offset_2 = offset_1; offset_1 = (U32)(offset - ZSTD_REP_MOVE); } /* store sequence */ _storeSequence: { size_t const litLength = start - anchor; ZSTD_storeSeq(seqStore, litLength, anchor, iend, (U32)offset, matchLength-MINMATCH); anchor = ip = start + matchLength; } /* check immediate repcode */ if (dictMode == ZSTD_dictMatchState) { while (ip <= ilimit) { U32 const current2 = (U32)(ip-base); U32 const repIndex = current2 - offset_2; const BYTE* repMatch = dictMode == ZSTD_dictMatchState && repIndex < prefixLowestIndex ? dictBase - dictIndexDelta + repIndex : base + repIndex; if ( ((U32)((prefixLowestIndex-1) - (U32)repIndex) >= 3 /* intentional overflow */) && (MEM_read32(repMatch) == MEM_read32(ip)) ) { const BYTE* const repEnd2 = repIndex < prefixLowestIndex ? dictEnd : iend; matchLength = ZSTD_count_2segments(ip+4, repMatch+4, iend, repEnd2, prefixLowest) + 4; offset = offset_2; offset_2 = offset_1; offset_1 = (U32)offset; /* swap offset_2 <=> offset_1 */ ZSTD_storeSeq(seqStore, 0, anchor, iend, 0, matchLength-MINMATCH); ip += matchLength; anchor = ip; continue; } break; } } if (dictMode == ZSTD_noDict) { while ( ((ip <= ilimit) & (offset_2>0)) && (MEM_read32(ip) == MEM_read32(ip - offset_2)) ) { /* store sequence */ matchLength = ZSTD_count(ip+4, ip+4-offset_2, iend) + 4; offset = offset_2; offset_2 = offset_1; offset_1 = (U32)offset; /* swap repcodes */ ZSTD_storeSeq(seqStore, 0, anchor, iend, 0, matchLength-MINMATCH); ip += matchLength; anchor = ip; continue; /* faster when present ... (?) */ } } } /* Save reps for next block */ rep[0] = offset_1 ? offset_1 : savedOffset; rep[1] = offset_2 ? offset_2 : savedOffset; /* Return the last literals size */ return (size_t)(iend - anchor); } size_t ZSTD_compressBlock_btlazy2( ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], void const* src, size_t srcSize) { return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_binaryTree, 2, ZSTD_noDict); } size_t ZSTD_compressBlock_lazy2( ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], void const* src, size_t srcSize) { return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_hashChain, 2, ZSTD_noDict); } size_t ZSTD_compressBlock_lazy( ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], void const* src, size_t srcSize) { return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_hashChain, 1, ZSTD_noDict); } size_t ZSTD_compressBlock_greedy( ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], void const* src, size_t srcSize) { return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_hashChain, 0, ZSTD_noDict); } size_t ZSTD_compressBlock_btlazy2_dictMatchState( ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], void const* src, size_t srcSize) { return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_binaryTree, 2, ZSTD_dictMatchState); } size_t ZSTD_compressBlock_lazy2_dictMatchState( ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], void const* src, size_t srcSize) { return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_hashChain, 2, ZSTD_dictMatchState); } size_t ZSTD_compressBlock_lazy_dictMatchState( ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], void const* src, size_t srcSize) { return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_hashChain, 1, ZSTD_dictMatchState); } size_t ZSTD_compressBlock_greedy_dictMatchState( ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], void const* src, size_t srcSize) { return ZSTD_compressBlock_lazy_generic(ms, seqStore, rep, src, srcSize, search_hashChain, 0, ZSTD_dictMatchState); } FORCE_INLINE_TEMPLATE size_t ZSTD_compressBlock_lazy_extDict_generic( ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], const void* src, size_t srcSize, const searchMethod_e searchMethod, const U32 depth) { 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 = ms->window.base; const U32 dictLimit = ms->window.dictLimit; const BYTE* const prefixStart = base + dictLimit; const BYTE* const dictBase = ms->window.dictBase; const BYTE* const dictEnd = dictBase + dictLimit; const BYTE* const dictStart = dictBase + ms->window.lowLimit; const U32 windowLog = ms->cParams.windowLog; typedef size_t (*searchMax_f)( ZSTD_matchState_t* ms, const BYTE* ip, const BYTE* iLimit, size_t* offsetPtr); searchMax_f searchMax = searchMethod==search_binaryTree ? ZSTD_BtFindBestMatch_extDict_selectMLS : ZSTD_HcFindBestMatch_extDict_selectMLS; U32 offset_1 = rep[0], offset_2 = rep[1]; DEBUGLOG(5, "ZSTD_compressBlock_lazy_extDict_generic"); /* init */ ip += (ip == prefixStart); /* Match Loop */ #if defined(__GNUC__) && defined(__x86_64__) /* I've measured random a 5% speed loss on levels 5 & 6 (greedy) when the * code alignment is perturbed. To fix the instability align the loop on 32-bytes. */ __asm__(".p2align 5"); #endif while (ip < ilimit) { size_t matchLength=0; size_t offset=0; const BYTE* start=ip+1; U32 current = (U32)(ip-base); /* check repCode */ { const U32 windowLow = ZSTD_getLowestMatchIndex(ms, current+1, windowLog); const U32 repIndex = (U32)(current+1 - offset_1); const BYTE* const repBase = repIndex < dictLimit ? dictBase : base; const BYTE* const repMatch = repBase + repIndex; if ( ((U32)((dictLimit-1) - repIndex) >= 3) /* intentional overflow */ & (offset_1 < current+1 - windowLow) ) /* note: we are searching at current+1 */ if (MEM_read32(ip+1) == MEM_read32(repMatch)) { /* repcode detected we should take it */ const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend; matchLength = ZSTD_count_2segments(ip+1+4, repMatch+4, iend, repEnd, prefixStart) + 4; if (depth==0) goto _storeSequence; } } /* first search (depth 0) */ { size_t offsetFound = 999999999; size_t const ml2 = searchMax(ms, ip, iend, &offsetFound); if (ml2 > matchLength) matchLength = ml2, start = ip, offset=offsetFound; } if (matchLength < 4) { ip += ((ip-anchor) >> kSearchStrength) + 1; /* jump faster over incompressible sections */ continue; } /* let's try to find a better solution */ if (depth>=1) while (ip= 3) /* intentional overflow : do not test positions overlapping 2 memory segments */ & (offset_1 < current - windowLow) ) /* equivalent to `current > repIndex >= windowLow` */ if (MEM_read32(ip) == MEM_read32(repMatch)) { /* repcode detected */ const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend; size_t const repLength = ZSTD_count_2segments(ip+4, repMatch+4, iend, repEnd, prefixStart) + 4; int const gain2 = (int)(repLength * 3); int const gain1 = (int)(matchLength*3 - ZSTD_highbit32((U32)offset+1) + 1); if ((repLength >= 4) && (gain2 > gain1)) matchLength = repLength, offset = 0, start = ip; } } /* search match, depth 1 */ { size_t offset2=999999999; size_t const ml2 = searchMax(ms, ip, iend, &offset2); int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)offset2+1)); /* raw approx */ int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 4); if ((ml2 >= 4) && (gain2 > gain1)) { matchLength = ml2, offset = offset2, start = ip; continue; /* search a better one */ } } /* let's find an even better one */ if ((depth==2) && (ip= 3) /* intentional overflow : do not test positions overlapping 2 memory segments */ & (offset_1 < current - windowLow) ) /* equivalent to `current > repIndex >= windowLow` */ if (MEM_read32(ip) == MEM_read32(repMatch)) { /* repcode detected */ const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend; size_t const repLength = ZSTD_count_2segments(ip+4, repMatch+4, iend, repEnd, prefixStart) + 4; int const gain2 = (int)(repLength * 4); int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 1); if ((repLength >= 4) && (gain2 > gain1)) matchLength = repLength, offset = 0, start = ip; } } /* search match, depth 2 */ { size_t offset2=999999999; size_t const ml2 = searchMax(ms, ip, iend, &offset2); int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)offset2+1)); /* raw approx */ int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offset+1) + 7); if ((ml2 >= 4) && (gain2 > gain1)) { matchLength = ml2, offset = offset2, start = ip; continue; } } } break; /* nothing found : store previous solution */ } /* catch up */ if (offset) { U32 const matchIndex = (U32)((start-base) - (offset - ZSTD_REP_MOVE)); const BYTE* match = (matchIndex < dictLimit) ? dictBase + matchIndex : base + matchIndex; const BYTE* const mStart = (matchIndex < dictLimit) ? dictStart : prefixStart; while ((start>anchor) && (match>mStart) && (start[-1] == match[-1])) { start--; match--; matchLength++; } /* catch up */ offset_2 = offset_1; offset_1 = (U32)(offset - ZSTD_REP_MOVE); } /* store sequence */ _storeSequence: { size_t const litLength = start - anchor; ZSTD_storeSeq(seqStore, litLength, anchor, iend, (U32)offset, matchLength-MINMATCH); anchor = ip = start + matchLength; } /* check immediate repcode */ while (ip <= ilimit) { const U32 repCurrent = (U32)(ip-base); const U32 windowLow = ZSTD_getLowestMatchIndex(ms, repCurrent, windowLog); const U32 repIndex = repCurrent - offset_2; const BYTE* const repBase = repIndex < dictLimit ? dictBase : base; const BYTE* const repMatch = repBase + repIndex; if ( ((U32)((dictLimit-1) - repIndex) >= 3) /* intentional overflow : do not test positions overlapping 2 memory segments */ & (offset_2 < repCurrent - windowLow) ) /* equivalent to `curr > repIndex >= windowLow` */ if (MEM_read32(ip) == MEM_read32(repMatch)) { /* repcode detected we should take it */ const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend; matchLength = ZSTD_count_2segments(ip+4, repMatch+4, iend, repEnd, prefixStart) + 4; offset = offset_2; offset_2 = offset_1; offset_1 = (U32)offset; /* swap offset history */ ZSTD_storeSeq(seqStore, 0, anchor, iend, 0, matchLength-MINMATCH); ip += matchLength; anchor = ip; continue; /* faster when present ... (?) */ } break; } } /* Save reps for next block */ rep[0] = offset_1; rep[1] = offset_2; /* Return the last literals size */ return (size_t)(iend - anchor); } size_t ZSTD_compressBlock_greedy_extDict( ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], void const* src, size_t srcSize) { return ZSTD_compressBlock_lazy_extDict_generic(ms, seqStore, rep, src, srcSize, search_hashChain, 0); } size_t ZSTD_compressBlock_lazy_extDict( ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], void const* src, size_t srcSize) { return ZSTD_compressBlock_lazy_extDict_generic(ms, seqStore, rep, src, srcSize, search_hashChain, 1); } size_t ZSTD_compressBlock_lazy2_extDict( ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], void const* src, size_t srcSize) { return ZSTD_compressBlock_lazy_extDict_generic(ms, seqStore, rep, src, srcSize, search_hashChain, 2); } size_t ZSTD_compressBlock_btlazy2_extDict( ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], void const* src, size_t srcSize) { return ZSTD_compressBlock_lazy_extDict_generic(ms, seqStore, rep, src, srcSize, search_binaryTree, 2); }