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-rw-r--r--lib/zstd/compress/zstd_lazy.c1414
1 files changed, 1414 insertions, 0 deletions
diff --git a/lib/zstd/compress/zstd_lazy.c b/lib/zstd/compress/zstd_lazy.c
new file mode 100644
index 000000000..fb54d4e28
--- /dev/null
+++ b/lib/zstd/compress/zstd_lazy.c
@@ -0,0 +1,1414 @@
+/*
+ * Copyright (c) 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 : curr >= btlow == (curr - btmask)
+ * doesn't fail */
+static void
+ZSTD_insertDUBT1(ZSTD_matchState_t* ms,
+ U32 curr, 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 = (curr>=dictLimit) ? base + curr : dictBase + curr;
+ const BYTE* const iend = (curr>=dictLimit) ? inputEnd : dictBase + dictLimit;
+ const BYTE* const dictEnd = dictBase + dictLimit;
+ const BYTE* const prefixStart = base + dictLimit;
+ const BYTE* match;
+ U32* smallerPtr = bt + 2*(curr&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 = (curr - windowValid > maxDistance) ? curr - maxDistance : windowValid;
+
+
+ DEBUGLOG(8, "ZSTD_insertDUBT1(%u) (dictLimit=%u, lowLimit=%u)",
+ curr, dictLimit, windowLow);
+ assert(curr >= btLow);
+ assert(ip < iend); /* condition for ZSTD_count */
+
+ for (; nbCompares && (matchIndex > windowLow); --nbCompares) {
+ U32* const nextPtr = bt + 2*(matchIndex & btMask);
+ size_t matchLength = MIN(commonLengthSmaller, commonLengthLarger); /* guaranteed minimum nb of common bytes */
+ assert(matchIndex < curr);
+ /* 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*/
+ || (curr < 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 */
+ || (curr < 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 ",
+ curr, 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 curr = (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);
+
+ for (; nbCompares && (dictMatchIndex > dictLowLimit); --nbCompares) {
+ 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(curr-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)",
+ curr, (U32)bestLength, (U32)matchLength, (U32)*offsetPtr, ZSTD_REP_MOVE + curr - matchIndex, dictMatchIndex, matchIndex);
+ bestLength = matchLength, *offsetPtr = ZSTD_REP_MOVE + curr - 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 = curr - ((U32)*offsetPtr - ZSTD_REP_MOVE); (void)mIndex;
+ DEBUGLOG(8, "ZSTD_DUBT_findBetterDictMatch(%u) : found match of length %u and offsetCode %u (pos %u)",
+ curr, (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 curr = (U32)(ip-base);
+ U32 const windowLow = ZSTD_getLowestMatchIndex(ms, curr, cParams->windowLog);
+
+ U32* const bt = ms->chainTable;
+ U32 const btLog = cParams->chainLog - 1;
+ U32 const btMask = (1 << btLog) - 1;
+ U32 const btLow = (btMask >= curr) ? 0 : curr - 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) ", curr);
+ assert(ip <= iend-8); /* required for h calculation */
+ assert(dictMode != ZSTD_dedicatedDictSearch);
+
+ /* 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*(curr&btMask);
+ U32* largerPtr = bt + 2*(curr&btMask) + 1;
+ U32 matchEndIdx = curr + 8 + 1;
+ U32 dummy32; /* to be nullified at the end */
+ size_t bestLength = 0;
+
+ matchIndex = hashTable[h];
+ hashTable[h] = curr; /* Update Hash Table */
+
+ for (; nbCompares && (matchIndex > windowLow); --nbCompares) {
+ 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(curr-matchIndex+1) - ZSTD_highbit32((U32)offsetPtr[0]+1)) )
+ bestLength = matchLength, *offsetPtr = ZSTD_REP_MOVE + curr - 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;
+
+ assert(nbCompares <= (1U << ZSTD_SEARCHLOG_MAX)); /* Check we haven't underflowed. */
+ if (dictMode == ZSTD_dictMatchState && nbCompares) {
+ bestLength = ZSTD_DUBT_findBetterDictMatch(
+ ms, ip, iend,
+ offsetPtr, bestLength, nbCompares,
+ mls, dictMode);
+ }
+
+ assert(matchEndIdx > curr+8); /* ensure nextToUpdate is increased */
+ ms->nextToUpdate = matchEndIdx - 8; /* skip repetitive patterns */
+ if (bestLength >= MINMATCH) {
+ U32 const mIndex = curr - ((U32)*offsetPtr - ZSTD_REP_MOVE); (void)mIndex;
+ DEBUGLOG(8, "ZSTD_DUBT_findBestMatch(%u) : found match of length %u and offsetCode %u (pos %u)",
+ curr, (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) */
+FORCE_INLINE_TEMPLATE 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);
+}
+
+void ZSTD_dedicatedDictSearch_lazy_loadDictionary(ZSTD_matchState_t* ms, const BYTE* const ip)
+{
+ const BYTE* const base = ms->window.base;
+ U32 const target = (U32)(ip - base);
+ U32* const hashTable = ms->hashTable;
+ U32* const chainTable = ms->chainTable;
+ U32 const chainSize = 1 << ms->cParams.chainLog;
+ U32 idx = ms->nextToUpdate;
+ U32 const minChain = chainSize < target ? target - chainSize : idx;
+ U32 const bucketSize = 1 << ZSTD_LAZY_DDSS_BUCKET_LOG;
+ U32 const cacheSize = bucketSize - 1;
+ U32 const chainAttempts = (1 << ms->cParams.searchLog) - cacheSize;
+ U32 const chainLimit = chainAttempts > 255 ? 255 : chainAttempts;
+
+ /* We know the hashtable is oversized by a factor of `bucketSize`.
+ * We are going to temporarily pretend `bucketSize == 1`, keeping only a
+ * single entry. We will use the rest of the space to construct a temporary
+ * chaintable.
+ */
+ U32 const hashLog = ms->cParams.hashLog - ZSTD_LAZY_DDSS_BUCKET_LOG;
+ U32* const tmpHashTable = hashTable;
+ U32* const tmpChainTable = hashTable + ((size_t)1 << hashLog);
+ U32 const tmpChainSize = ((1 << ZSTD_LAZY_DDSS_BUCKET_LOG) - 1) << hashLog;
+ U32 const tmpMinChain = tmpChainSize < target ? target - tmpChainSize : idx;
+
+ U32 hashIdx;
+
+ assert(ms->cParams.chainLog <= 24);
+ assert(ms->cParams.hashLog >= ms->cParams.chainLog);
+ assert(idx != 0);
+ assert(tmpMinChain <= minChain);
+
+ /* fill conventional hash table and conventional chain table */
+ for ( ; idx < target; idx++) {
+ U32 const h = (U32)ZSTD_hashPtr(base + idx, hashLog, ms->cParams.minMatch);
+ if (idx >= tmpMinChain) {
+ tmpChainTable[idx - tmpMinChain] = hashTable[h];
+ }
+ tmpHashTable[h] = idx;
+ }
+
+ /* sort chains into ddss chain table */
+ {
+ U32 chainPos = 0;
+ for (hashIdx = 0; hashIdx < (1U << hashLog); hashIdx++) {
+ U32 count;
+ U32 countBeyondMinChain = 0;
+ U32 i = tmpHashTable[hashIdx];
+ for (count = 0; i >= tmpMinChain && count < cacheSize; count++) {
+ /* skip through the chain to the first position that won't be
+ * in the hash cache bucket */
+ if (i < minChain) {
+ countBeyondMinChain++;
+ }
+ i = tmpChainTable[i - tmpMinChain];
+ }
+ if (count == cacheSize) {
+ for (count = 0; count < chainLimit;) {
+ if (i < minChain) {
+ if (!i || countBeyondMinChain++ > cacheSize) {
+ /* only allow pulling `cacheSize` number of entries
+ * into the cache or chainTable beyond `minChain`,
+ * to replace the entries pulled out of the
+ * chainTable into the cache. This lets us reach
+ * back further without increasing the total number
+ * of entries in the chainTable, guaranteeing the
+ * DDSS chain table will fit into the space
+ * allocated for the regular one. */
+ break;
+ }
+ }
+ chainTable[chainPos++] = i;
+ count++;
+ if (i < tmpMinChain) {
+ break;
+ }
+ i = tmpChainTable[i - tmpMinChain];
+ }
+ } else {
+ count = 0;
+ }
+ if (count) {
+ tmpHashTable[hashIdx] = ((chainPos - count) << 8) + count;
+ } else {
+ tmpHashTable[hashIdx] = 0;
+ }
+ }
+ assert(chainPos <= chainSize); /* I believe this is guaranteed... */
+ }
+
+ /* move chain pointers into the last entry of each hash bucket */
+ for (hashIdx = (1 << hashLog); hashIdx; ) {
+ U32 const bucketIdx = --hashIdx << ZSTD_LAZY_DDSS_BUCKET_LOG;
+ U32 const chainPackedPointer = tmpHashTable[hashIdx];
+ U32 i;
+ for (i = 0; i < cacheSize; i++) {
+ hashTable[bucketIdx + i] = 0;
+ }
+ hashTable[bucketIdx + bucketSize - 1] = chainPackedPointer;
+ }
+
+ /* fill the buckets of the hash table */
+ for (idx = ms->nextToUpdate; idx < target; idx++) {
+ U32 const h = (U32)ZSTD_hashPtr(base + idx, hashLog, ms->cParams.minMatch)
+ << ZSTD_LAZY_DDSS_BUCKET_LOG;
+ U32 i;
+ /* Shift hash cache down 1. */
+ for (i = cacheSize - 1; i; i--)
+ hashTable[h + i] = hashTable[h + i - 1];
+ hashTable[h] = idx;
+ }
+
+ ms->nextToUpdate = target;
+}
+
+
+/* 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 curr = (U32)(ip-base);
+ const U32 maxDistance = 1U << cParams->windowLog;
+ const U32 lowestValid = ms->window.lowLimit;
+ const U32 withinMaxDistance = (curr - lowestValid > maxDistance) ? curr - maxDistance : lowestValid;
+ const U32 isDictionary = (ms->loadedDictEnd != 0);
+ const U32 lowLimit = isDictionary ? lowestValid : withinMaxDistance;
+ const U32 minChain = curr > chainSize ? curr - chainSize : 0;
+ U32 nbAttempts = 1U << cParams->searchLog;
+ size_t ml=4-1;
+
+ const ZSTD_matchState_t* const dms = ms->dictMatchState;
+ const U32 ddsHashLog = dictMode == ZSTD_dedicatedDictSearch
+ ? dms->cParams.hashLog - ZSTD_LAZY_DDSS_BUCKET_LOG : 0;
+ const size_t ddsIdx = dictMode == ZSTD_dedicatedDictSearch
+ ? ZSTD_hashPtr(ip, ddsHashLog, mls) << ZSTD_LAZY_DDSS_BUCKET_LOG : 0;
+
+ U32 matchIndex;
+
+ if (dictMode == ZSTD_dedicatedDictSearch) {
+ const U32* entry = &dms->hashTable[ddsIdx];
+ PREFETCH_L1(entry);
+ }
+
+ /* HC4 match finder */
+ 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 = curr - 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);
+ }
+
+ assert(nbAttempts <= (1U << ZSTD_SEARCHLOG_MAX)); /* Check we haven't underflowed. */
+ if (dictMode == ZSTD_dedicatedDictSearch) {
+ const U32 ddsLowestIndex = dms->window.dictLimit;
+ const BYTE* const ddsBase = dms->window.base;
+ const BYTE* const ddsEnd = dms->window.nextSrc;
+ const U32 ddsSize = (U32)(ddsEnd - ddsBase);
+ const U32 ddsIndexDelta = dictLimit - ddsSize;
+ const U32 bucketSize = (1 << ZSTD_LAZY_DDSS_BUCKET_LOG);
+ const U32 bucketLimit = nbAttempts < bucketSize - 1 ? nbAttempts : bucketSize - 1;
+ U32 ddsAttempt;
+
+ for (ddsAttempt = 0; ddsAttempt < bucketSize - 1; ddsAttempt++) {
+ PREFETCH_L1(ddsBase + dms->hashTable[ddsIdx + ddsAttempt]);
+ }
+
+ {
+ U32 const chainPackedPointer = dms->hashTable[ddsIdx + bucketSize - 1];
+ U32 const chainIndex = chainPackedPointer >> 8;
+
+ PREFETCH_L1(&dms->chainTable[chainIndex]);
+ }
+
+ for (ddsAttempt = 0; ddsAttempt < bucketLimit; ddsAttempt++) {
+ size_t currentMl=0;
+ const BYTE* match;
+ matchIndex = dms->hashTable[ddsIdx + ddsAttempt];
+ match = ddsBase + matchIndex;
+
+ if (!matchIndex) {
+ return ml;
+ }
+
+ /* guaranteed by table construction */
+ (void)ddsLowestIndex;
+ assert(matchIndex >= ddsLowestIndex);
+ assert(match+4 <= ddsEnd);
+ if (MEM_read32(match) == MEM_read32(ip)) {
+ /* assumption : matchIndex <= dictLimit-4 (by table construction) */
+ currentMl = ZSTD_count_2segments(ip+4, match+4, iLimit, ddsEnd, prefixStart) + 4;
+ }
+
+ /* save best solution */
+ if (currentMl > ml) {
+ ml = currentMl;
+ *offsetPtr = curr - (matchIndex + ddsIndexDelta) + ZSTD_REP_MOVE;
+ if (ip+currentMl == iLimit) {
+ /* best possible, avoids read overflow on next attempt */
+ return ml;
+ }
+ }
+ }
+
+ {
+ U32 const chainPackedPointer = dms->hashTable[ddsIdx + bucketSize - 1];
+ U32 chainIndex = chainPackedPointer >> 8;
+ U32 const chainLength = chainPackedPointer & 0xFF;
+ U32 const chainAttempts = nbAttempts - ddsAttempt;
+ U32 const chainLimit = chainAttempts > chainLength ? chainLength : chainAttempts;
+ U32 chainAttempt;
+
+ for (chainAttempt = 0 ; chainAttempt < chainLimit; chainAttempt++) {
+ PREFETCH_L1(ddsBase + dms->chainTable[chainIndex + chainAttempt]);
+ }
+
+ for (chainAttempt = 0 ; chainAttempt < chainLimit; chainAttempt++, chainIndex++) {
+ size_t currentMl=0;
+ const BYTE* match;
+ matchIndex = dms->chainTable[chainIndex];
+ match = ddsBase + matchIndex;
+
+ /* guaranteed by table construction */
+ assert(matchIndex >= ddsLowestIndex);
+ assert(match+4 <= ddsEnd);
+ if (MEM_read32(match) == MEM_read32(ip)) {
+ /* assumption : matchIndex <= dictLimit-4 (by table construction) */
+ currentMl = ZSTD_count_2segments(ip+4, match+4, iLimit, ddsEnd, prefixStart) + 4;
+ }
+
+ /* save best solution */
+ if (currentMl > ml) {
+ ml = currentMl;
+ *offsetPtr = curr - (matchIndex + ddsIndexDelta) + ZSTD_REP_MOVE;
+ if (ip+currentMl == iLimit) break; /* best possible, avoids read overflow on next attempt */
+ }
+ }
+ }
+ } else if (dictMode == ZSTD_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 = curr - (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);
+ }
+}
+
+
+static size_t ZSTD_HcFindBestMatch_dedicatedDictSearch_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_dedicatedDictSearch);
+ case 5 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 5, ZSTD_dedicatedDictSearch);
+ case 7 :
+ case 6 : return ZSTD_HcFindBestMatch_generic(ms, ip, iLimit, offsetPtr, 6, ZSTD_dedicatedDictSearch);
+ }
+}
+
+
+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);
+
+ /*
+ * This table is indexed first by the four ZSTD_dictMode_e values, and then
+ * by the two searchMethod_e values. NULLs are placed for configurations
+ * that should never occur (extDict modes go to the other implementation
+ * below and there is no DDSS for binary tree search yet).
+ */
+ const searchMax_f searchFuncs[4][2] = {
+ {
+ ZSTD_HcFindBestMatch_selectMLS,
+ ZSTD_BtFindBestMatch_selectMLS
+ },
+ {
+ NULL,
+ NULL
+ },
+ {
+ ZSTD_HcFindBestMatch_dictMatchState_selectMLS,
+ ZSTD_BtFindBestMatch_dictMatchState_selectMLS
+ },
+ {
+ ZSTD_HcFindBestMatch_dedicatedDictSearch_selectMLS,
+ NULL
+ }
+ };
+
+ searchMax_f const searchMax = searchFuncs[dictMode][searchMethod == search_binaryTree];
+ U32 offset_1 = rep[0], offset_2 = rep[1], savedOffset=0;
+
+ const int isDMS = dictMode == ZSTD_dictMatchState;
+ const int isDDS = dictMode == ZSTD_dedicatedDictSearch;
+ const int isDxS = isDMS || isDDS;
+ const ZSTD_matchState_t* const dms = ms->dictMatchState;
+ const U32 dictLowestIndex = isDxS ? dms->window.dictLimit : 0;
+ const BYTE* const dictBase = isDxS ? dms->window.base : NULL;
+ const BYTE* const dictLowest = isDxS ? dictBase + dictLowestIndex : NULL;
+ const BYTE* const dictEnd = isDxS ? dms->window.nextSrc : NULL;
+ const U32 dictIndexDelta = isDxS ?
+ prefixLowestIndex - (U32)(dictEnd - dictBase) :
+ 0;
+ const U32 dictAndPrefixLength = (U32)((ip - prefixLowest) + (dictEnd - dictLowest));
+
+ assert(searchMax != NULL);
+
+ DEBUGLOG(5, "ZSTD_compressBlock_lazy_generic (dictMode=%u)", (U32)dictMode);
+
+ /* init */
+ ip += (dictAndPrefixLength == 0);
+ if (dictMode == ZSTD_noDict) {
+ U32 const curr = (U32)(ip - base);
+ U32 const windowLow = ZSTD_getLowestPrefixIndex(ms, curr, ms->cParams.windowLog);
+ U32 const maxRep = curr - windowLow;
+ if (offset_2 > maxRep) savedOffset = offset_2, offset_2 = 0;
+ if (offset_1 > maxRep) savedOffset = offset_1, offset_1 = 0;
+ }
+ if (isDxS) {
+ /* dictMatchState repCode checks don't currently handle repCode == 0
+ * disabling. */
+ assert(offset_1 <= dictAndPrefixLength);
+ assert(offset_2 <= dictAndPrefixLength);
+ }
+
+ /* Match Loop */
+#if 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 (isDxS) {
+ const U32 repIndex = (U32)(ip - base) + 1 - offset_1;
+ const BYTE* repMatch = ((dictMode == ZSTD_dictMatchState || dictMode == ZSTD_dedicatedDictSearch)
+ && 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 (ip<ilimit) {
+ ip ++;
+ if ( (dictMode == ZSTD_noDict)
+ && (offset) && ((offset_1>0) & (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 (isDxS) {
+ 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) && (ip<ilimit)) {
+ ip ++;
+ if ( (dictMode == ZSTD_noDict)
+ && (offset) && ((offset_1>0) & (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 (isDxS) {
+ 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 (isDxS) {
+ 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 (isDxS) {
+ while (ip <= ilimit) {
+ U32 const current2 = (U32)(ip-base);
+ U32 const repIndex = current2 - offset_2;
+ const BYTE* repMatch = 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);
+}
+
+
+size_t ZSTD_compressBlock_lazy2_dedicatedDictSearch(
+ 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_dedicatedDictSearch);
+}
+
+size_t ZSTD_compressBlock_lazy_dedicatedDictSearch(
+ 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_dedicatedDictSearch);
+}
+
+size_t ZSTD_compressBlock_greedy_dedicatedDictSearch(
+ 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_dedicatedDictSearch);
+}
+
+
+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(__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 curr = (U32)(ip-base);
+
+ /* check repCode */
+ { const U32 windowLow = ZSTD_getLowestMatchIndex(ms, curr+1, windowLog);
+ const U32 repIndex = (U32)(curr+1 - offset_1);
+ const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
+ const BYTE* const repMatch = repBase + repIndex;
+ if (((U32)((dictLimit-1) - repIndex) >= 3) & (repIndex > windowLow)) /* intentional overflow */
+ 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<ilimit) {
+ ip ++;
+ curr++;
+ /* check repCode */
+ if (offset) {
+ const U32 windowLow = ZSTD_getLowestMatchIndex(ms, curr, windowLog);
+ const U32 repIndex = (U32)(curr - offset_1);
+ const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
+ const BYTE* const repMatch = repBase + repIndex;
+ if (((U32)((dictLimit-1) - repIndex) >= 3) & (repIndex > windowLow)) /* intentional overflow */
+ 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<ilimit)) {
+ ip ++;
+ curr++;
+ /* check repCode */
+ if (offset) {
+ const U32 windowLow = ZSTD_getLowestMatchIndex(ms, curr, windowLog);
+ const U32 repIndex = (U32)(curr - offset_1);
+ const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
+ const BYTE* const repMatch = repBase + repIndex;
+ if (((U32)((dictLimit-1) - repIndex) >= 3) & (repIndex > windowLow)) /* intentional overflow */
+ 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) & (repIndex > windowLow)) /* intentional overflow */
+ 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);
+}