diff options
Diffstat (limited to 'other-licenses/7zstub/src/C/LzFindMt.c')
| -rw-r--r-- | other-licenses/7zstub/src/C/LzFindMt.c | 820 |
1 files changed, 820 insertions, 0 deletions
diff --git a/other-licenses/7zstub/src/C/LzFindMt.c b/other-licenses/7zstub/src/C/LzFindMt.c new file mode 100644 index 0000000000..2563824fcd --- /dev/null +++ b/other-licenses/7zstub/src/C/LzFindMt.c @@ -0,0 +1,820 @@ +/* LzFindMt.c -- multithreaded Match finder for LZ algorithms
+2017-06-10 : Igor Pavlov : Public domain */
+
+#include "Precomp.h"
+
+#include "LzHash.h"
+
+#include "LzFindMt.h"
+
+static void MtSync_Construct(CMtSync *p)
+{
+ p->wasCreated = False;
+ p->csWasInitialized = False;
+ p->csWasEntered = False;
+ Thread_Construct(&p->thread);
+ Event_Construct(&p->canStart);
+ Event_Construct(&p->wasStarted);
+ Event_Construct(&p->wasStopped);
+ Semaphore_Construct(&p->freeSemaphore);
+ Semaphore_Construct(&p->filledSemaphore);
+}
+
+static void MtSync_GetNextBlock(CMtSync *p)
+{
+ if (p->needStart)
+ {
+ p->numProcessedBlocks = 1;
+ p->needStart = False;
+ p->stopWriting = False;
+ p->exit = False;
+ Event_Reset(&p->wasStarted);
+ Event_Reset(&p->wasStopped);
+
+ Event_Set(&p->canStart);
+ Event_Wait(&p->wasStarted);
+
+ // if (mt) MatchFinder_Init_LowHash(mt->MatchFinder);
+ }
+ else
+ {
+ CriticalSection_Leave(&p->cs);
+ p->csWasEntered = False;
+ p->numProcessedBlocks++;
+ Semaphore_Release1(&p->freeSemaphore);
+ }
+ Semaphore_Wait(&p->filledSemaphore);
+ CriticalSection_Enter(&p->cs);
+ p->csWasEntered = True;
+}
+
+/* MtSync_StopWriting must be called if Writing was started */
+
+static void MtSync_StopWriting(CMtSync *p)
+{
+ UInt32 myNumBlocks = p->numProcessedBlocks;
+ if (!Thread_WasCreated(&p->thread) || p->needStart)
+ return;
+ p->stopWriting = True;
+ if (p->csWasEntered)
+ {
+ CriticalSection_Leave(&p->cs);
+ p->csWasEntered = False;
+ }
+ Semaphore_Release1(&p->freeSemaphore);
+
+ Event_Wait(&p->wasStopped);
+
+ while (myNumBlocks++ != p->numProcessedBlocks)
+ {
+ Semaphore_Wait(&p->filledSemaphore);
+ Semaphore_Release1(&p->freeSemaphore);
+ }
+ p->needStart = True;
+}
+
+static void MtSync_Destruct(CMtSync *p)
+{
+ if (Thread_WasCreated(&p->thread))
+ {
+ MtSync_StopWriting(p);
+ p->exit = True;
+ if (p->needStart)
+ Event_Set(&p->canStart);
+ Thread_Wait(&p->thread);
+ Thread_Close(&p->thread);
+ }
+ if (p->csWasInitialized)
+ {
+ CriticalSection_Delete(&p->cs);
+ p->csWasInitialized = False;
+ }
+
+ Event_Close(&p->canStart);
+ Event_Close(&p->wasStarted);
+ Event_Close(&p->wasStopped);
+ Semaphore_Close(&p->freeSemaphore);
+ Semaphore_Close(&p->filledSemaphore);
+
+ p->wasCreated = False;
+}
+
+#define RINOK_THREAD(x) { if ((x) != 0) return SZ_ERROR_THREAD; }
+
+static SRes MtSync_Create2(CMtSync *p, THREAD_FUNC_TYPE startAddress, void *obj, UInt32 numBlocks)
+{
+ if (p->wasCreated)
+ return SZ_OK;
+
+ RINOK_THREAD(CriticalSection_Init(&p->cs));
+ p->csWasInitialized = True;
+
+ RINOK_THREAD(AutoResetEvent_CreateNotSignaled(&p->canStart));
+ RINOK_THREAD(AutoResetEvent_CreateNotSignaled(&p->wasStarted));
+ RINOK_THREAD(AutoResetEvent_CreateNotSignaled(&p->wasStopped));
+
+ RINOK_THREAD(Semaphore_Create(&p->freeSemaphore, numBlocks, numBlocks));
+ RINOK_THREAD(Semaphore_Create(&p->filledSemaphore, 0, numBlocks));
+
+ p->needStart = True;
+
+ RINOK_THREAD(Thread_Create(&p->thread, startAddress, obj));
+ p->wasCreated = True;
+ return SZ_OK;
+}
+
+static SRes MtSync_Create(CMtSync *p, THREAD_FUNC_TYPE startAddress, void *obj, UInt32 numBlocks)
+{
+ SRes res = MtSync_Create2(p, startAddress, obj, numBlocks);
+ if (res != SZ_OK)
+ MtSync_Destruct(p);
+ return res;
+}
+
+void MtSync_Init(CMtSync *p) { p->needStart = True; }
+
+#define kMtMaxValForNormalize 0xFFFFFFFF
+
+#define DEF_GetHeads2(name, v, action) \
+ static void GetHeads ## name(const Byte *p, UInt32 pos, \
+ UInt32 *hash, UInt32 hashMask, UInt32 *heads, UInt32 numHeads, const UInt32 *crc) \
+ { action; for (; numHeads != 0; numHeads--) { \
+ const UInt32 value = (v); p++; *heads++ = pos - hash[value]; hash[value] = pos++; } }
+
+#define DEF_GetHeads(name, v) DEF_GetHeads2(name, v, ;)
+
+DEF_GetHeads2(2, (p[0] | ((UInt32)p[1] << 8)), UNUSED_VAR(hashMask); UNUSED_VAR(crc); )
+DEF_GetHeads(3, (crc[p[0]] ^ p[1] ^ ((UInt32)p[2] << 8)) & hashMask)
+DEF_GetHeads(4, (crc[p[0]] ^ p[1] ^ ((UInt32)p[2] << 8) ^ (crc[p[3]] << 5)) & hashMask)
+DEF_GetHeads(4b, (crc[p[0]] ^ p[1] ^ ((UInt32)p[2] << 8) ^ ((UInt32)p[3] << 16)) & hashMask)
+/* DEF_GetHeads(5, (crc[p[0]] ^ p[1] ^ ((UInt32)p[2] << 8) ^ (crc[p[3]] << 5) ^ (crc[p[4]] << 3)) & hashMask) */
+
+static void HashThreadFunc(CMatchFinderMt *mt)
+{
+ CMtSync *p = &mt->hashSync;
+ for (;;)
+ {
+ UInt32 numProcessedBlocks = 0;
+ Event_Wait(&p->canStart);
+ Event_Set(&p->wasStarted);
+
+ MatchFinder_Init_HighHash(mt->MatchFinder);
+
+ for (;;)
+ {
+ if (p->exit)
+ return;
+ if (p->stopWriting)
+ {
+ p->numProcessedBlocks = numProcessedBlocks;
+ Event_Set(&p->wasStopped);
+ break;
+ }
+
+ {
+ CMatchFinder *mf = mt->MatchFinder;
+ if (MatchFinder_NeedMove(mf))
+ {
+ CriticalSection_Enter(&mt->btSync.cs);
+ CriticalSection_Enter(&mt->hashSync.cs);
+ {
+ const Byte *beforePtr = Inline_MatchFinder_GetPointerToCurrentPos(mf);
+ ptrdiff_t offset;
+ MatchFinder_MoveBlock(mf);
+ offset = beforePtr - Inline_MatchFinder_GetPointerToCurrentPos(mf);
+ mt->pointerToCurPos -= offset;
+ mt->buffer -= offset;
+ }
+ CriticalSection_Leave(&mt->btSync.cs);
+ CriticalSection_Leave(&mt->hashSync.cs);
+ continue;
+ }
+
+ Semaphore_Wait(&p->freeSemaphore);
+
+ MatchFinder_ReadIfRequired(mf);
+ if (mf->pos > (kMtMaxValForNormalize - kMtHashBlockSize))
+ {
+ UInt32 subValue = (mf->pos - mf->historySize - 1);
+ MatchFinder_ReduceOffsets(mf, subValue);
+ MatchFinder_Normalize3(subValue, mf->hash + mf->fixedHashSize, (size_t)mf->hashMask + 1);
+ }
+ {
+ UInt32 *heads = mt->hashBuf + ((numProcessedBlocks++) & kMtHashNumBlocksMask) * kMtHashBlockSize;
+ UInt32 num = mf->streamPos - mf->pos;
+ heads[0] = 2;
+ heads[1] = num;
+ if (num >= mf->numHashBytes)
+ {
+ num = num - mf->numHashBytes + 1;
+ if (num > kMtHashBlockSize - 2)
+ num = kMtHashBlockSize - 2;
+ mt->GetHeadsFunc(mf->buffer, mf->pos, mf->hash + mf->fixedHashSize, mf->hashMask, heads + 2, num, mf->crc);
+ heads[0] = 2 + num;
+ }
+ mf->pos += num;
+ mf->buffer += num;
+ }
+ }
+
+ Semaphore_Release1(&p->filledSemaphore);
+ }
+ }
+}
+
+static void MatchFinderMt_GetNextBlock_Hash(CMatchFinderMt *p)
+{
+ MtSync_GetNextBlock(&p->hashSync);
+ p->hashBufPosLimit = p->hashBufPos = ((p->hashSync.numProcessedBlocks - 1) & kMtHashNumBlocksMask) * kMtHashBlockSize;
+ p->hashBufPosLimit += p->hashBuf[p->hashBufPos++];
+ p->hashNumAvail = p->hashBuf[p->hashBufPos++];
+}
+
+#define kEmptyHashValue 0
+
+/* #define MFMT_GM_INLINE */
+
+#ifdef MFMT_GM_INLINE
+
+#define NO_INLINE MY_FAST_CALL
+
+static Int32 NO_INLINE GetMatchesSpecN(UInt32 lenLimit, UInt32 pos, const Byte *cur, CLzRef *son,
+ UInt32 _cyclicBufferPos, UInt32 _cyclicBufferSize, UInt32 _cutValue,
+ UInt32 *_distances, UInt32 _maxLen, const UInt32 *hash, Int32 limit, UInt32 size, UInt32 *posRes)
+{
+ do
+ {
+ UInt32 *distances = _distances + 1;
+ UInt32 curMatch = pos - *hash++;
+
+ CLzRef *ptr0 = son + (_cyclicBufferPos << 1) + 1;
+ CLzRef *ptr1 = son + (_cyclicBufferPos << 1);
+ UInt32 len0 = 0, len1 = 0;
+ UInt32 cutValue = _cutValue;
+ UInt32 maxLen = _maxLen;
+ for (;;)
+ {
+ UInt32 delta = pos - curMatch;
+ if (cutValue-- == 0 || delta >= _cyclicBufferSize)
+ {
+ *ptr0 = *ptr1 = kEmptyHashValue;
+ break;
+ }
+ {
+ CLzRef *pair = son + ((_cyclicBufferPos - delta + ((delta > _cyclicBufferPos) ? _cyclicBufferSize : 0)) << 1);
+ const Byte *pb = cur - delta;
+ UInt32 len = (len0 < len1 ? len0 : len1);
+ if (pb[len] == cur[len])
+ {
+ if (++len != lenLimit && pb[len] == cur[len])
+ while (++len != lenLimit)
+ if (pb[len] != cur[len])
+ break;
+ if (maxLen < len)
+ {
+ *distances++ = maxLen = len;
+ *distances++ = delta - 1;
+ if (len == lenLimit)
+ {
+ *ptr1 = pair[0];
+ *ptr0 = pair[1];
+ break;
+ }
+ }
+ }
+ if (pb[len] < cur[len])
+ {
+ *ptr1 = curMatch;
+ ptr1 = pair + 1;
+ curMatch = *ptr1;
+ len1 = len;
+ }
+ else
+ {
+ *ptr0 = curMatch;
+ ptr0 = pair;
+ curMatch = *ptr0;
+ len0 = len;
+ }
+ }
+ }
+ pos++;
+ _cyclicBufferPos++;
+ cur++;
+ {
+ UInt32 num = (UInt32)(distances - _distances);
+ *_distances = num - 1;
+ _distances += num;
+ limit -= num;
+ }
+ }
+ while (limit > 0 && --size != 0);
+ *posRes = pos;
+ return limit;
+}
+
+#endif
+
+static void BtGetMatches(CMatchFinderMt *p, UInt32 *distances)
+{
+ UInt32 numProcessed = 0;
+ UInt32 curPos = 2;
+ UInt32 limit = kMtBtBlockSize - (p->matchMaxLen * 2);
+
+ distances[1] = p->hashNumAvail;
+
+ while (curPos < limit)
+ {
+ if (p->hashBufPos == p->hashBufPosLimit)
+ {
+ MatchFinderMt_GetNextBlock_Hash(p);
+ distances[1] = numProcessed + p->hashNumAvail;
+ if (p->hashNumAvail >= p->numHashBytes)
+ continue;
+ distances[0] = curPos + p->hashNumAvail;
+ distances += curPos;
+ for (; p->hashNumAvail != 0; p->hashNumAvail--)
+ *distances++ = 0;
+ return;
+ }
+ {
+ UInt32 size = p->hashBufPosLimit - p->hashBufPos;
+ UInt32 lenLimit = p->matchMaxLen;
+ UInt32 pos = p->pos;
+ UInt32 cyclicBufferPos = p->cyclicBufferPos;
+ if (lenLimit >= p->hashNumAvail)
+ lenLimit = p->hashNumAvail;
+ {
+ UInt32 size2 = p->hashNumAvail - lenLimit + 1;
+ if (size2 < size)
+ size = size2;
+ size2 = p->cyclicBufferSize - cyclicBufferPos;
+ if (size2 < size)
+ size = size2;
+ }
+
+ #ifndef MFMT_GM_INLINE
+ while (curPos < limit && size-- != 0)
+ {
+ UInt32 *startDistances = distances + curPos;
+ UInt32 num = (UInt32)(GetMatchesSpec1(lenLimit, pos - p->hashBuf[p->hashBufPos++],
+ pos, p->buffer, p->son, cyclicBufferPos, p->cyclicBufferSize, p->cutValue,
+ startDistances + 1, p->numHashBytes - 1) - startDistances);
+ *startDistances = num - 1;
+ curPos += num;
+ cyclicBufferPos++;
+ pos++;
+ p->buffer++;
+ }
+ #else
+ {
+ UInt32 posRes;
+ curPos = limit - GetMatchesSpecN(lenLimit, pos, p->buffer, p->son, cyclicBufferPos, p->cyclicBufferSize, p->cutValue,
+ distances + curPos, p->numHashBytes - 1, p->hashBuf + p->hashBufPos, (Int32)(limit - curPos), size, &posRes);
+ p->hashBufPos += posRes - pos;
+ cyclicBufferPos += posRes - pos;
+ p->buffer += posRes - pos;
+ pos = posRes;
+ }
+ #endif
+
+ numProcessed += pos - p->pos;
+ p->hashNumAvail -= pos - p->pos;
+ p->pos = pos;
+ if (cyclicBufferPos == p->cyclicBufferSize)
+ cyclicBufferPos = 0;
+ p->cyclicBufferPos = cyclicBufferPos;
+ }
+ }
+
+ distances[0] = curPos;
+}
+
+static void BtFillBlock(CMatchFinderMt *p, UInt32 globalBlockIndex)
+{
+ CMtSync *sync = &p->hashSync;
+ if (!sync->needStart)
+ {
+ CriticalSection_Enter(&sync->cs);
+ sync->csWasEntered = True;
+ }
+
+ BtGetMatches(p, p->btBuf + (globalBlockIndex & kMtBtNumBlocksMask) * kMtBtBlockSize);
+
+ if (p->pos > kMtMaxValForNormalize - kMtBtBlockSize)
+ {
+ UInt32 subValue = p->pos - p->cyclicBufferSize;
+ MatchFinder_Normalize3(subValue, p->son, (size_t)p->cyclicBufferSize * 2);
+ p->pos -= subValue;
+ }
+
+ if (!sync->needStart)
+ {
+ CriticalSection_Leave(&sync->cs);
+ sync->csWasEntered = False;
+ }
+}
+
+void BtThreadFunc(CMatchFinderMt *mt)
+{
+ CMtSync *p = &mt->btSync;
+ for (;;)
+ {
+ UInt32 blockIndex = 0;
+ Event_Wait(&p->canStart);
+ Event_Set(&p->wasStarted);
+ for (;;)
+ {
+ if (p->exit)
+ return;
+ if (p->stopWriting)
+ {
+ p->numProcessedBlocks = blockIndex;
+ MtSync_StopWriting(&mt->hashSync);
+ Event_Set(&p->wasStopped);
+ break;
+ }
+ Semaphore_Wait(&p->freeSemaphore);
+ BtFillBlock(mt, blockIndex++);
+ Semaphore_Release1(&p->filledSemaphore);
+ }
+ }
+}
+
+void MatchFinderMt_Construct(CMatchFinderMt *p)
+{
+ p->hashBuf = NULL;
+ MtSync_Construct(&p->hashSync);
+ MtSync_Construct(&p->btSync);
+}
+
+static void MatchFinderMt_FreeMem(CMatchFinderMt *p, ISzAllocPtr alloc)
+{
+ ISzAlloc_Free(alloc, p->hashBuf);
+ p->hashBuf = NULL;
+}
+
+void MatchFinderMt_Destruct(CMatchFinderMt *p, ISzAllocPtr alloc)
+{
+ MtSync_Destruct(&p->hashSync);
+ MtSync_Destruct(&p->btSync);
+ MatchFinderMt_FreeMem(p, alloc);
+}
+
+#define kHashBufferSize (kMtHashBlockSize * kMtHashNumBlocks)
+#define kBtBufferSize (kMtBtBlockSize * kMtBtNumBlocks)
+
+static THREAD_FUNC_RET_TYPE THREAD_FUNC_CALL_TYPE HashThreadFunc2(void *p) { HashThreadFunc((CMatchFinderMt *)p); return 0; }
+static THREAD_FUNC_RET_TYPE THREAD_FUNC_CALL_TYPE BtThreadFunc2(void *p)
+{
+ Byte allocaDummy[0x180];
+ unsigned i = 0;
+ for (i = 0; i < 16; i++)
+ allocaDummy[i] = (Byte)0;
+ if (allocaDummy[0] == 0)
+ BtThreadFunc((CMatchFinderMt *)p);
+ return 0;
+}
+
+SRes MatchFinderMt_Create(CMatchFinderMt *p, UInt32 historySize, UInt32 keepAddBufferBefore,
+ UInt32 matchMaxLen, UInt32 keepAddBufferAfter, ISzAllocPtr alloc)
+{
+ CMatchFinder *mf = p->MatchFinder;
+ p->historySize = historySize;
+ if (kMtBtBlockSize <= matchMaxLen * 4)
+ return SZ_ERROR_PARAM;
+ if (!p->hashBuf)
+ {
+ p->hashBuf = (UInt32 *)ISzAlloc_Alloc(alloc, (kHashBufferSize + kBtBufferSize) * sizeof(UInt32));
+ if (!p->hashBuf)
+ return SZ_ERROR_MEM;
+ p->btBuf = p->hashBuf + kHashBufferSize;
+ }
+ keepAddBufferBefore += (kHashBufferSize + kBtBufferSize);
+ keepAddBufferAfter += kMtHashBlockSize;
+ if (!MatchFinder_Create(mf, historySize, keepAddBufferBefore, matchMaxLen, keepAddBufferAfter, alloc))
+ return SZ_ERROR_MEM;
+
+ RINOK(MtSync_Create(&p->hashSync, HashThreadFunc2, p, kMtHashNumBlocks));
+ RINOK(MtSync_Create(&p->btSync, BtThreadFunc2, p, kMtBtNumBlocks));
+ return SZ_OK;
+}
+
+/* Call it after ReleaseStream / SetStream */
+static void MatchFinderMt_Init(CMatchFinderMt *p)
+{
+ CMatchFinder *mf = p->MatchFinder;
+
+ p->btBufPos =
+ p->btBufPosLimit = 0;
+ p->hashBufPos =
+ p->hashBufPosLimit = 0;
+
+ /* Init without data reading. We don't want to read data in this thread */
+ MatchFinder_Init_3(mf, False);
+ MatchFinder_Init_LowHash(mf);
+
+ p->pointerToCurPos = Inline_MatchFinder_GetPointerToCurrentPos(mf);
+ p->btNumAvailBytes = 0;
+ p->lzPos = p->historySize + 1;
+
+ p->hash = mf->hash;
+ p->fixedHashSize = mf->fixedHashSize;
+ p->crc = mf->crc;
+
+ p->son = mf->son;
+ p->matchMaxLen = mf->matchMaxLen;
+ p->numHashBytes = mf->numHashBytes;
+ p->pos = mf->pos;
+ p->buffer = mf->buffer;
+ p->cyclicBufferPos = mf->cyclicBufferPos;
+ p->cyclicBufferSize = mf->cyclicBufferSize;
+ p->cutValue = mf->cutValue;
+}
+
+/* ReleaseStream is required to finish multithreading */
+void MatchFinderMt_ReleaseStream(CMatchFinderMt *p)
+{
+ MtSync_StopWriting(&p->btSync);
+ /* p->MatchFinder->ReleaseStream(); */
+}
+
+static void MatchFinderMt_Normalize(CMatchFinderMt *p)
+{
+ MatchFinder_Normalize3(p->lzPos - p->historySize - 1, p->hash, p->fixedHashSize);
+ p->lzPos = p->historySize + 1;
+}
+
+static void MatchFinderMt_GetNextBlock_Bt(CMatchFinderMt *p)
+{
+ UInt32 blockIndex;
+ MtSync_GetNextBlock(&p->btSync);
+ blockIndex = ((p->btSync.numProcessedBlocks - 1) & kMtBtNumBlocksMask);
+ p->btBufPosLimit = p->btBufPos = blockIndex * kMtBtBlockSize;
+ p->btBufPosLimit += p->btBuf[p->btBufPos++];
+ p->btNumAvailBytes = p->btBuf[p->btBufPos++];
+ if (p->lzPos >= kMtMaxValForNormalize - kMtBtBlockSize)
+ MatchFinderMt_Normalize(p);
+}
+
+static const Byte * MatchFinderMt_GetPointerToCurrentPos(CMatchFinderMt *p)
+{
+ return p->pointerToCurPos;
+}
+
+#define GET_NEXT_BLOCK_IF_REQUIRED if (p->btBufPos == p->btBufPosLimit) MatchFinderMt_GetNextBlock_Bt(p);
+
+static UInt32 MatchFinderMt_GetNumAvailableBytes(CMatchFinderMt *p)
+{
+ GET_NEXT_BLOCK_IF_REQUIRED;
+ return p->btNumAvailBytes;
+}
+
+static UInt32 * MixMatches2(CMatchFinderMt *p, UInt32 matchMinPos, UInt32 *distances)
+{
+ UInt32 h2, curMatch2;
+ UInt32 *hash = p->hash;
+ const Byte *cur = p->pointerToCurPos;
+ UInt32 lzPos = p->lzPos;
+ MT_HASH2_CALC
+
+ curMatch2 = hash[h2];
+ hash[h2] = lzPos;
+
+ if (curMatch2 >= matchMinPos)
+ if (cur[(ptrdiff_t)curMatch2 - lzPos] == cur[0])
+ {
+ *distances++ = 2;
+ *distances++ = lzPos - curMatch2 - 1;
+ }
+
+ return distances;
+}
+
+static UInt32 * MixMatches3(CMatchFinderMt *p, UInt32 matchMinPos, UInt32 *distances)
+{
+ UInt32 h2, h3, curMatch2, curMatch3;
+ UInt32 *hash = p->hash;
+ const Byte *cur = p->pointerToCurPos;
+ UInt32 lzPos = p->lzPos;
+ MT_HASH3_CALC
+
+ curMatch2 = hash[ h2];
+ curMatch3 = (hash + kFix3HashSize)[h3];
+
+ hash[ h2] = lzPos;
+ (hash + kFix3HashSize)[h3] = lzPos;
+
+ if (curMatch2 >= matchMinPos && cur[(ptrdiff_t)curMatch2 - lzPos] == cur[0])
+ {
+ distances[1] = lzPos - curMatch2 - 1;
+ if (cur[(ptrdiff_t)curMatch2 - lzPos + 2] == cur[2])
+ {
+ distances[0] = 3;
+ return distances + 2;
+ }
+ distances[0] = 2;
+ distances += 2;
+ }
+
+ if (curMatch3 >= matchMinPos && cur[(ptrdiff_t)curMatch3 - lzPos] == cur[0])
+ {
+ *distances++ = 3;
+ *distances++ = lzPos - curMatch3 - 1;
+ }
+
+ return distances;
+}
+
+/*
+static UInt32 *MixMatches4(CMatchFinderMt *p, UInt32 matchMinPos, UInt32 *distances)
+{
+ UInt32 h2, h3, h4, curMatch2, curMatch3, curMatch4;
+ UInt32 *hash = p->hash;
+ const Byte *cur = p->pointerToCurPos;
+ UInt32 lzPos = p->lzPos;
+ MT_HASH4_CALC
+
+ curMatch2 = hash[ h2];
+ curMatch3 = (hash + kFix3HashSize)[h3];
+ curMatch4 = (hash + kFix4HashSize)[h4];
+
+ hash[ h2] = lzPos;
+ (hash + kFix3HashSize)[h3] = lzPos;
+ (hash + kFix4HashSize)[h4] = lzPos;
+
+ if (curMatch2 >= matchMinPos && cur[(ptrdiff_t)curMatch2 - lzPos] == cur[0])
+ {
+ distances[1] = lzPos - curMatch2 - 1;
+ if (cur[(ptrdiff_t)curMatch2 - lzPos + 2] == cur[2])
+ {
+ distances[0] = (cur[(ptrdiff_t)curMatch2 - lzPos + 3] == cur[3]) ? 4 : 3;
+ return distances + 2;
+ }
+ distances[0] = 2;
+ distances += 2;
+ }
+
+ if (curMatch3 >= matchMinPos && cur[(ptrdiff_t)curMatch3 - lzPos] == cur[0])
+ {
+ distances[1] = lzPos - curMatch3 - 1;
+ if (cur[(ptrdiff_t)curMatch3 - lzPos + 3] == cur[3])
+ {
+ distances[0] = 4;
+ return distances + 2;
+ }
+ distances[0] = 3;
+ distances += 2;
+ }
+
+ if (curMatch4 >= matchMinPos)
+ if (
+ cur[(ptrdiff_t)curMatch4 - lzPos] == cur[0] &&
+ cur[(ptrdiff_t)curMatch4 - lzPos + 3] == cur[3]
+ )
+ {
+ *distances++ = 4;
+ *distances++ = lzPos - curMatch4 - 1;
+ }
+
+ return distances;
+}
+*/
+
+#define INCREASE_LZ_POS p->lzPos++; p->pointerToCurPos++;
+
+static UInt32 MatchFinderMt2_GetMatches(CMatchFinderMt *p, UInt32 *distances)
+{
+ const UInt32 *btBuf = p->btBuf + p->btBufPos;
+ UInt32 len = *btBuf++;
+ p->btBufPos += 1 + len;
+ p->btNumAvailBytes--;
+ {
+ UInt32 i;
+ for (i = 0; i < len; i += 2)
+ {
+ UInt32 v0 = btBuf[0];
+ UInt32 v1 = btBuf[1];
+ btBuf += 2;
+ distances[0] = v0;
+ distances[1] = v1;
+ distances += 2;
+ }
+ }
+ INCREASE_LZ_POS
+ return len;
+}
+
+static UInt32 MatchFinderMt_GetMatches(CMatchFinderMt *p, UInt32 *distances)
+{
+ const UInt32 *btBuf = p->btBuf + p->btBufPos;
+ UInt32 len = *btBuf++;
+ p->btBufPos += 1 + len;
+
+ if (len == 0)
+ {
+ /* change for bt5 ! */
+ if (p->btNumAvailBytes-- >= 4)
+ len = (UInt32)(p->MixMatchesFunc(p, p->lzPos - p->historySize, distances) - (distances));
+ }
+ else
+ {
+ /* Condition: there are matches in btBuf with length < p->numHashBytes */
+ UInt32 *distances2;
+ p->btNumAvailBytes--;
+ distances2 = p->MixMatchesFunc(p, p->lzPos - btBuf[1], distances);
+ do
+ {
+ UInt32 v0 = btBuf[0];
+ UInt32 v1 = btBuf[1];
+ btBuf += 2;
+ distances2[0] = v0;
+ distances2[1] = v1;
+ distances2 += 2;
+ }
+ while ((len -= 2) != 0);
+ len = (UInt32)(distances2 - (distances));
+ }
+ INCREASE_LZ_POS
+ return len;
+}
+
+#define SKIP_HEADER2_MT do { GET_NEXT_BLOCK_IF_REQUIRED
+#define SKIP_HEADER_MT(n) SKIP_HEADER2_MT if (p->btNumAvailBytes-- >= (n)) { const Byte *cur = p->pointerToCurPos; UInt32 *hash = p->hash;
+#define SKIP_FOOTER_MT } INCREASE_LZ_POS p->btBufPos += p->btBuf[p->btBufPos] + 1; } while (--num != 0);
+
+static void MatchFinderMt0_Skip(CMatchFinderMt *p, UInt32 num)
+{
+ SKIP_HEADER2_MT { p->btNumAvailBytes--;
+ SKIP_FOOTER_MT
+}
+
+static void MatchFinderMt2_Skip(CMatchFinderMt *p, UInt32 num)
+{
+ SKIP_HEADER_MT(2)
+ UInt32 h2;
+ MT_HASH2_CALC
+ hash[h2] = p->lzPos;
+ SKIP_FOOTER_MT
+}
+
+static void MatchFinderMt3_Skip(CMatchFinderMt *p, UInt32 num)
+{
+ SKIP_HEADER_MT(3)
+ UInt32 h2, h3;
+ MT_HASH3_CALC
+ (hash + kFix3HashSize)[h3] =
+ hash[ h2] =
+ p->lzPos;
+ SKIP_FOOTER_MT
+}
+
+/*
+static void MatchFinderMt4_Skip(CMatchFinderMt *p, UInt32 num)
+{
+ SKIP_HEADER_MT(4)
+ UInt32 h2, h3, h4;
+ MT_HASH4_CALC
+ (hash + kFix4HashSize)[h4] =
+ (hash + kFix3HashSize)[h3] =
+ hash[ h2] =
+ p->lzPos;
+ SKIP_FOOTER_MT
+}
+*/
+
+void MatchFinderMt_CreateVTable(CMatchFinderMt *p, IMatchFinder *vTable)
+{
+ vTable->Init = (Mf_Init_Func)MatchFinderMt_Init;
+ vTable->GetNumAvailableBytes = (Mf_GetNumAvailableBytes_Func)MatchFinderMt_GetNumAvailableBytes;
+ vTable->GetPointerToCurrentPos = (Mf_GetPointerToCurrentPos_Func)MatchFinderMt_GetPointerToCurrentPos;
+ vTable->GetMatches = (Mf_GetMatches_Func)MatchFinderMt_GetMatches;
+
+ switch (p->MatchFinder->numHashBytes)
+ {
+ case 2:
+ p->GetHeadsFunc = GetHeads2;
+ p->MixMatchesFunc = (Mf_Mix_Matches)NULL;
+ vTable->Skip = (Mf_Skip_Func)MatchFinderMt0_Skip;
+ vTable->GetMatches = (Mf_GetMatches_Func)MatchFinderMt2_GetMatches;
+ break;
+ case 3:
+ p->GetHeadsFunc = GetHeads3;
+ p->MixMatchesFunc = (Mf_Mix_Matches)MixMatches2;
+ vTable->Skip = (Mf_Skip_Func)MatchFinderMt2_Skip;
+ break;
+ default:
+ /* case 4: */
+ p->GetHeadsFunc = p->MatchFinder->bigHash ? GetHeads4b : GetHeads4;
+ p->MixMatchesFunc = (Mf_Mix_Matches)MixMatches3;
+ vTable->Skip = (Mf_Skip_Func)MatchFinderMt3_Skip;
+ break;
+ /*
+ default:
+ p->GetHeadsFunc = GetHeads5;
+ p->MixMatchesFunc = (Mf_Mix_Matches)MixMatches4;
+ vTable->Skip = (Mf_Skip_Func)MatchFinderMt4_Skip;
+ break;
+ */
+ }
+}
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