15.05

C/LzFind.c

@@ -1,5 +1,5 @@
 /* LzFind.c -- Match finder for LZ algorithms
-2009-04-22 : Igor Pavlov : Public domain */
+2015-05-15 : Igor Pavlov : Public domain */
 
 #include "Precomp.h"
 
@@ -12,7 +12,7 @@
 #define kMaxValForNormalize ((UInt32)0xFFFFFFFF)
 #define kNormalizeStepMin (1 << 10) /* it must be power of 2 */
 #define kNormalizeMask (~(kNormalizeStepMin - 1))
-#define kMaxHistorySize ((UInt32)3 << 30)
+#define kMaxHistorySize ((UInt32)7 << 29)
 
 #define kStartMaxLen 3
 
@@ -21,7 +21,7 @@ static void LzInWindow_Free(CMatchFinder *p, ISzAlloc *alloc)
   if (!p->directInput)
   {
     alloc->Free(alloc, p->bufferBase);
-    p->bufferBase = 0;
+    p->bufferBase = NULL;
   }
 }
 
@@ -35,17 +35,16 @@ static int LzInWindow_Create(CMatchFinder *p, UInt32 keepSizeReserv, ISzAlloc *a
     p->blockSize = blockSize;
     return 1;
   }
-  if (p->bufferBase == 0 || p->blockSize != blockSize)
+  if (!p->bufferBase || p->blockSize != blockSize)
   {
     LzInWindow_Free(p, alloc);
     p->blockSize = blockSize;
     p->bufferBase = (Byte *)alloc->Alloc(alloc, (size_t)blockSize);
   }
-  return (p->bufferBase != 0);
+  return (p->bufferBase != NULL);
 }
 
 Byte *MatchFinder_GetPointerToCurrentPos(CMatchFinder *p) { return p->buffer; }
-Byte MatchFinder_GetIndexByte(CMatchFinder *p, Int32 index) { return p->buffer[index]; }
 
 UInt32 MatchFinder_GetNumAvailableBytes(CMatchFinder *p) { return p->streamPos - p->pos; }
 
@@ -60,6 +59,7 @@ static void MatchFinder_ReadBlock(CMatchFinder *p)
 {
   if (p->streamEndWasReached || p->result != SZ_OK)
     return;
+
   if (p->directInput)
   {
     UInt32 curSize = 0xFFFFFFFF - p->streamPos;
@@ -71,12 +71,14 @@ static void MatchFinder_ReadBlock(CMatchFinder *p)
       p->streamEndWasReached = 1;
     return;
   }
+  
   for (;;)
   {
     Byte *dest = p->buffer + (p->streamPos - p->pos);
     size_t size = (p->bufferBase + p->blockSize - dest);
     if (size == 0)
       return;
+
     p->result = p->stream->Read(p->stream, dest, &size);
     if (p->result != SZ_OK)
       return;
@@ -94,8 +96,8 @@ static void MatchFinder_ReadBlock(CMatchFinder *p)
 void MatchFinder_MoveBlock(CMatchFinder *p)
 {
   memmove(p->bufferBase,
-    p->buffer - p->keepSizeBefore,
-    (size_t)(p->streamPos - p->pos + p->keepSizeBefore));
+      p->buffer - p->keepSizeBefore,
+      (size_t)(p->streamPos - p->pos + p->keepSizeBefore));
   p->buffer = p->bufferBase + p->keepSizeBefore;
 }
 
@@ -135,15 +137,15 @@ static void MatchFinder_SetDefaultSettings(CMatchFinder *p)
 void MatchFinder_Construct(CMatchFinder *p)
 {
   UInt32 i;
-  p->bufferBase = 0;
+  p->bufferBase = NULL;
   p->directInput = 0;
-  p->hash = 0;
+  p->hash = NULL;
   MatchFinder_SetDefaultSettings(p);
 
   for (i = 0; i < 256; i++)
   {
     UInt32 r = i;
-    int j;
+    unsigned j;
     for (j = 0; j < 8; j++)
       r = (r >> 1) ^ (kCrcPoly & ~((r & 1) - 1));
     p->crc[i] = r;
@@ -153,7 +155,7 @@ void MatchFinder_Construct(CMatchFinder *p)
 static void MatchFinder_FreeThisClassMemory(CMatchFinder *p, ISzAlloc *alloc)
 {
   alloc->Free(alloc, p->hash);
-  p->hash = 0;
+  p->hash = NULL;
 }
 
 void MatchFinder_Free(CMatchFinder *p, ISzAlloc *alloc)
@@ -162,11 +164,11 @@ void MatchFinder_Free(CMatchFinder *p, ISzAlloc *alloc)
   LzInWindow_Free(p, alloc);
 }
 
-static CLzRef* AllocRefs(UInt32 num, ISzAlloc *alloc)
+static CLzRef* AllocRefs(size_t num, ISzAlloc *alloc)
 {
   size_t sizeInBytes = (size_t)num * sizeof(CLzRef);
   if (sizeInBytes / sizeof(CLzRef) != num)
-    return 0;
+    return NULL;
   return (CLzRef *)alloc->Alloc(alloc, sizeInBytes);
 }
 
@@ -175,19 +177,24 @@ int MatchFinder_Create(CMatchFinder *p, UInt32 historySize,
     ISzAlloc *alloc)
 {
   UInt32 sizeReserv;
+  
   if (historySize > kMaxHistorySize)
   {
     MatchFinder_Free(p, alloc);
     return 0;
   }
+  
   sizeReserv = historySize >> 1;
-  if (historySize > ((UInt32)2 << 30))
-    sizeReserv = historySize >> 2;
+       if (historySize >= ((UInt32)3 << 30)) sizeReserv = historySize >> 3;
+  else if (historySize >= ((UInt32)2 << 30)) sizeReserv = historySize >> 2;
+  
   sizeReserv += (keepAddBufferBefore + matchMaxLen + keepAddBufferAfter) / 2 + (1 << 19);
 
   p->keepSizeBefore = historySize + keepAddBufferBefore + 1;
   p->keepSizeAfter = matchMaxLen + keepAddBufferAfter;
+  
   /* we need one additional byte, since we use MoveBlock after pos++ and before dictionary using */
+  
   if (LzInWindow_Create(p, sizeReserv, alloc))
   {
     UInt32 newCyclicBufferSize = historySize + 1;
@@ -212,6 +219,7 @@ int MatchFinder_Create(CMatchFinder *p, UInt32 historySize,
             hs = (1 << 24) - 1;
           else
             hs >>= 1;
+          /* if (bigHash) mode, GetHeads4b() in LzFindMt.c needs (hs >= ((1 << 24) - 1))) */
         }
       }
       p->hashMask = hs;
@@ -223,24 +231,32 @@ int MatchFinder_Create(CMatchFinder *p, UInt32 historySize,
     }
 
     {
-      UInt32 prevSize = p->hashSizeSum + p->numSons;
-      UInt32 newSize;
+      size_t newSize;
+      size_t numSons;
       p->historySize = historySize;
       p->hashSizeSum = hs;
       p->cyclicBufferSize = newCyclicBufferSize;
-      p->numSons = (p->btMode ? newCyclicBufferSize * 2 : newCyclicBufferSize);
-      newSize = p->hashSizeSum + p->numSons;
-      if (p->hash != 0 && prevSize == newSize)
+      
+      numSons = newCyclicBufferSize;
+      if (p->btMode)
+        numSons <<= 1;
+      newSize = hs + numSons;
+
+      if (p->hash && p->numRefs == newSize)
         return 1;
+      
       MatchFinder_FreeThisClassMemory(p, alloc);
+      p->numRefs = newSize;
       p->hash = AllocRefs(newSize, alloc);
-      if (p->hash != 0)
+      
+      if (p->hash)
       {
         p->son = p->hash + p->hashSizeSum;
         return 1;
       }
     }
   }
+
   MatchFinder_Free(p, alloc);
   return 0;
 }
@@ -249,9 +265,11 @@ static void MatchFinder_SetLimits(CMatchFinder *p)
 {
   UInt32 limit = kMaxValForNormalize - p->pos;
   UInt32 limit2 = p->cyclicBufferSize - p->cyclicBufferPos;
+  
   if (limit2 < limit)
     limit = limit2;
   limit2 = p->streamPos - p->pos;
+  
   if (limit2 <= p->keepSizeAfter)
   {
     if (limit2 > 0)
@@ -259,8 +277,10 @@ static void MatchFinder_SetLimits(CMatchFinder *p)
   }
   else
     limit2 -= p->keepSizeAfter;
+  
   if (limit2 < limit)
     limit = limit2;
+  
   {
     UInt32 lenLimit = p->streamPos - p->pos;
     if (lenLimit > p->matchMaxLen)
@@ -273,8 +293,11 @@ static void MatchFinder_SetLimits(CMatchFinder *p)
 void MatchFinder_Init(CMatchFinder *p)
 {
   UInt32 i;
-  for (i = 0; i < p->hashSizeSum; i++)
-    p->hash[i] = kEmptyHashValue;
+  UInt32 *hash = p->hash;
+  UInt32 num = p->hashSizeSum;
+  for (i = 0; i < num; i++)
+    hash[i] = kEmptyHashValue;
+  
   p->cyclicBufferPos = 0;
   p->buffer = p->bufferBase;
   p->pos = p->streamPos = p->cyclicBufferSize;
@@ -289,9 +312,9 @@ static UInt32 MatchFinder_GetSubValue(CMatchFinder *p)
   return (p->pos - p->historySize - 1) & kNormalizeMask;
 }
 
-void MatchFinder_Normalize3(UInt32 subValue, CLzRef *items, UInt32 numItems)
+void MatchFinder_Normalize3(UInt32 subValue, CLzRef *items, size_t numItems)
 {
-  UInt32 i;
+  size_t i;
   for (i = 0; i < numItems; i++)
   {
     UInt32 value = items[i];
@@ -306,7 +329,7 @@ void MatchFinder_Normalize3(UInt32 subValue, CLzRef *items, UInt32 numItems)
 static void MatchFinder_Normalize(CMatchFinder *p)
 {
   UInt32 subValue = MatchFinder_GetSubValue(p);
-  MatchFinder_Normalize3(subValue, p->hash, p->hashSizeSum + p->numSons);
+  MatchFinder_Normalize3(subValue, p->hash, p->numRefs);
   MatchFinder_ReduceOffsets(p, subValue);
 }
 
@@ -467,7 +490,7 @@ static void SkipMatchesSpec(UInt32 lenLimit, UInt32 curMatch, UInt32 pos, const
 static void MatchFinder_MovePos(CMatchFinder *p) { MOVE_POS; }
 
 #define GET_MATCHES_HEADER2(minLen, ret_op) \
-  UInt32 lenLimit; UInt32 hashValue; const Byte *cur; UInt32 curMatch; \
+  UInt32 lenLimit; UInt32 hv; const Byte *cur; UInt32 curMatch; \
   lenLimit = p->lenLimit; { if (lenLimit < minLen) { MatchFinder_MovePos(p); ret_op; }} \
   cur = p->buffer;
 
@@ -483,13 +506,20 @@ static void MatchFinder_MovePos(CMatchFinder *p) { MOVE_POS; }
 #define SKIP_FOOTER \
   SkipMatchesSpec(lenLimit, curMatch, MF_PARAMS(p)); MOVE_POS;
 
+#define UPDATE_maxLen { \
+    ptrdiff_t diff = (ptrdiff_t)0 - d2; \
+    const Byte *c = cur + maxLen; \
+    const Byte *lim = cur + lenLimit; \
+    for (; c != lim; c++) if (*(c + diff) != *c) break; \
+    maxLen = (UInt32)(c - cur); }
+
 static UInt32 Bt2_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances)
 {
   UInt32 offset;
   GET_MATCHES_HEADER(2)
   HASH2_CALC;
-  curMatch = p->hash[hashValue];
-  p->hash[hashValue] = p->pos;
+  curMatch = p->hash[hv];
+  p->hash[hv] = p->pos;
   offset = 0;
   GET_MATCHES_FOOTER(offset, 1)
 }
@@ -499,35 +529,38 @@ UInt32 Bt3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances)
   UInt32 offset;
   GET_MATCHES_HEADER(3)
   HASH_ZIP_CALC;
-  curMatch = p->hash[hashValue];
-  p->hash[hashValue] = p->pos;
+  curMatch = p->hash[hv];
+  p->hash[hv] = p->pos;
   offset = 0;
   GET_MATCHES_FOOTER(offset, 2)
 }
 
 static UInt32 Bt3_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances)
 {
-  UInt32 hash2Value, delta2, maxLen, offset;
+  UInt32 h2, d2, maxLen, offset, pos;
+  UInt32 *hash;
   GET_MATCHES_HEADER(3)
 
   HASH3_CALC;
 
-  delta2 = p->pos - p->hash[hash2Value];
-  curMatch = p->hash[kFix3HashSize + hashValue];
-  
-  p->hash[hash2Value] =
-  p->hash[kFix3HashSize + hashValue] = p->pos;
+  hash = p->hash;
+  pos = p->pos;
 
+  d2 = pos - hash[h2];
+
+  curMatch = hash[kFix3HashSize + hv];
+  
+  hash[h2] = pos;
+  hash[kFix3HashSize + hv] = pos;
 
   maxLen = 2;
   offset = 0;
-  if (delta2 < p->cyclicBufferSize && *(cur - delta2) == *cur)
+
+  if (d2 < p->cyclicBufferSize && *(cur - d2) == *cur)
   {
-    for (; maxLen != lenLimit; maxLen++)
-      if (cur[(ptrdiff_t)maxLen - delta2] != cur[maxLen])
-        break;
+    UPDATE_maxLen
     distances[0] = maxLen;
-    distances[1] = delta2 - 1;
+    distances[1] = d2 - 1;
     offset = 2;
     if (maxLen == lenLimit)
     {
@@ -535,44 +568,51 @@ static UInt32 Bt3_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances)
       MOVE_POS_RET;
     }
   }
+  
   GET_MATCHES_FOOTER(offset, maxLen)
 }
 
 static UInt32 Bt4_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances)
 {
-  UInt32 hash2Value, hash3Value, delta2, delta3, maxLen, offset;
+  UInt32 h2, h3, d2, d3, maxLen, offset, pos;
+  UInt32 *hash;
   GET_MATCHES_HEADER(4)
 
   HASH4_CALC;
 
-  delta2 = p->pos - p->hash[                hash2Value];
-  delta3 = p->pos - p->hash[kFix3HashSize + hash3Value];
-  curMatch = p->hash[kFix4HashSize + hashValue];
-  
-  p->hash[                hash2Value] =
-  p->hash[kFix3HashSize + hash3Value] =
-  p->hash[kFix4HashSize + hashValue] = p->pos;
+  hash = p->hash;
+  pos = p->pos;
 
-  maxLen = 1;
+  d2 = pos - hash[                h2];
+  d3 = pos - hash[kFix3HashSize + h3];
+
+  curMatch = hash[kFix4HashSize + hv];
+
+  hash[                h2] = pos;
+  hash[kFix3HashSize + h3] = pos;
+  hash[kFix4HashSize + hv] = pos;
+
+  maxLen = 0;
   offset = 0;
-  if (delta2 < p->cyclicBufferSize && *(cur - delta2) == *cur)
+  
+  if (d2 < p->cyclicBufferSize && *(cur - d2) == *cur)
   {
     distances[0] = maxLen = 2;
-    distances[1] = delta2 - 1;
+    distances[1] = d2 - 1;
     offset = 2;
   }
-  if (delta2 != delta3 && delta3 < p->cyclicBufferSize && *(cur - delta3) == *cur)
+  
+  if (d2 != d3 && d3 < p->cyclicBufferSize && *(cur - d3) == *cur)
   {
     maxLen = 3;
-    distances[offset + 1] = delta3 - 1;
+    distances[offset + 1] = d3 - 1;
     offset += 2;
-    delta2 = delta3;
+    d2 = d3;
   }
+  
   if (offset != 0)
   {
-    for (; maxLen != lenLimit; maxLen++)
-      if (cur[(ptrdiff_t)maxLen - delta2] != cur[maxLen])
-        break;
+    UPDATE_maxLen
     distances[offset - 2] = maxLen;
     if (maxLen == lenLimit)
     {
@@ -580,46 +620,131 @@ static UInt32 Bt4_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances)
       MOVE_POS_RET;
     }
   }
+  
   if (maxLen < 3)
     maxLen = 3;
+  
   GET_MATCHES_FOOTER(offset, maxLen)
 }
 
+/*
+static UInt32 Bt5_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances)
+{
+  UInt32 h2, h3, h4, d2, d3, d4, maxLen, offset, pos;
+  UInt32 *hash;
+  GET_MATCHES_HEADER(5)
+
+  HASH5_CALC;
+
+  hash = p->hash;
+  pos = p->pos;
+
+  d2 = pos - hash[                h2];
+  d3 = pos - hash[kFix3HashSize + h3];
+  d4 = pos - hash[kFix4HashSize + h4];
+
+  curMatch = hash[kFix5HashSize + hv];
+
+  hash[                h2] = pos;
+  hash[kFix3HashSize + h3] = pos;
+  hash[kFix4HashSize + h4] = pos;
+  hash[kFix5HashSize + hv] = pos;
+
+  maxLen = 0;
+  offset = 0;
+
+  if (d2 < p->cyclicBufferSize && *(cur - d2) == *cur)
+  {
+    distances[0] = maxLen = 2;
+    distances[1] = d2 - 1;
+    offset = 2;
+    if (*(cur - d2 + 2) == cur[2])
+      distances[0] = maxLen = 3;
+    else if (d3 < p->cyclicBufferSize && *(cur - d3) == *cur)
+    {
+      distances[2] = maxLen = 3;
+      distances[3] = d3 - 1;
+      offset = 4;
+      d2 = d3;
+    }
+  }
+  else if (d3 < p->cyclicBufferSize && *(cur - d3) == *cur)
+  {
+    distances[0] = maxLen = 3;
+    distances[1] = d3 - 1;
+    offset = 2;
+    d2 = d3;
+  }
+  
+  if (d2 != d4 && d4 < p->cyclicBufferSize
+      && *(cur - d4) == *cur
+      && *(cur - d4 + 3) == *(cur + 3))
+  {
+    maxLen = 4;
+    distances[offset + 1] = d4 - 1;
+    offset += 2;
+    d2 = d4;
+  }
+  
+  if (offset != 0)
+  {
+    UPDATE_maxLen
+    distances[offset - 2] = maxLen;
+    if (maxLen == lenLimit)
+    {
+      SkipMatchesSpec(lenLimit, curMatch, MF_PARAMS(p));
+      MOVE_POS_RET;
+    }
+  }
+
+  if (maxLen < 4)
+    maxLen = 4;
+  
+  GET_MATCHES_FOOTER(offset, maxLen)
+}
+*/
+
 static UInt32 Hc4_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances)
 {
-  UInt32 hash2Value, hash3Value, delta2, delta3, maxLen, offset;
+  UInt32 h2, h3, d2, d3, maxLen, offset, pos;
+  UInt32 *hash;
   GET_MATCHES_HEADER(4)
 
   HASH4_CALC;
 
-  delta2 = p->pos - p->hash[                hash2Value];
-  delta3 = p->pos - p->hash[kFix3HashSize + hash3Value];
-  curMatch = p->hash[kFix4HashSize + hashValue];
+  hash = p->hash;
+  pos = p->pos;
+  
+  d2 = pos - hash[                h2];
+  d3 = pos - hash[kFix3HashSize + h3];
+  
+  curMatch = hash[kFix4HashSize + hv];
 
-  p->hash[                hash2Value] =
-  p->hash[kFix3HashSize + hash3Value] =
-  p->hash[kFix4HashSize + hashValue] = p->pos;
+  hash[                h2] = pos;
+  hash[kFix3HashSize + h3] = pos;
+  hash[kFix4HashSize + hv] = pos;
 
-  maxLen = 1;
+  maxLen = 0;
   offset = 0;
-  if (delta2 < p->cyclicBufferSize && *(cur - delta2) == *cur)
+
+  if (d2 < p->cyclicBufferSize && *(cur - d2) == *cur)
   {
     distances[0] = maxLen = 2;
-    distances[1] = delta2 - 1;
+    distances[1] = d2 - 1;
     offset = 2;
   }
-  if (delta2 != delta3 && delta3 < p->cyclicBufferSize && *(cur - delta3) == *cur)
+  
+  if (d2 != d3 && d3 < p->cyclicBufferSize && *(cur - d3) == *cur)
   {
     maxLen = 3;
-    distances[offset + 1] = delta3 - 1;
+    distances[offset + 1] = d3 - 1;
     offset += 2;
-    delta2 = delta3;
+    d2 = d3;
   }
+  
   if (offset != 0)
   {
-    for (; maxLen != lenLimit; maxLen++)
-      if (cur[(ptrdiff_t)maxLen - delta2] != cur[maxLen])
-        break;
+    UPDATE_maxLen
     distances[offset - 2] = maxLen;
     if (maxLen == lenLimit)
     {
@@ -627,22 +752,103 @@ static UInt32 Hc4_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances)
       MOVE_POS_RET;
     }
   }
+  
   if (maxLen < 3)
     maxLen = 3;
+
   offset = (UInt32)(Hc_GetMatchesSpec(lenLimit, curMatch, MF_PARAMS(p),
-    distances + offset, maxLen) - (distances));
+      distances + offset, maxLen) - (distances));
   MOVE_POS_RET
 }
 
+/*
+static UInt32 Hc5_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances)
+{
+  UInt32 h2, h3, h4, d2, d3, d4, maxLen, offset, pos
+  UInt32 *hash;
+  GET_MATCHES_HEADER(5)
+
+  HASH5_CALC;
+
+  hash = p->hash;
+  pos = p->pos;
+  
+  d2 = pos - hash[                h2];
+  d3 = pos - hash[kFix3HashSize + h3];
+  d4 = pos - hash[kFix4HashSize + h4];
+
+  curMatch = hash[kFix5HashSize + hv];
+
+  hash[                h2] = pos;
+  hash[kFix3HashSize + h3] = pos;
+  hash[kFix4HashSize + h4] = pos;
+  hash[kFix5HashSize + hv] = pos;
+
+  maxLen = 0;
+  offset = 0;
+
+  if (d2 < p->cyclicBufferSize && *(cur - d2) == *cur)
+  {
+    distances[0] = maxLen = 2;
+    distances[1] = d2 - 1;
+    offset = 2;
+    if (*(cur - d2 + 2) == cur[2])
+      distances[0] = maxLen = 3;
+    else if (d3 < p->cyclicBufferSize && *(cur - d3) == *cur)
+    {
+      distances[2] = maxLen = 3;
+      distances[3] = d3 - 1;
+      offset = 4;
+      d2 = d3;
+    }
+  }
+  else if (d3 < p->cyclicBufferSize && *(cur - d3) == *cur)
+  {
+    distances[0] = maxLen = 3;
+    distances[1] = d3 - 1;
+    offset = 2;
+    d2 = d3;
+  }
+  
+  if (d2 != d4 && d4 < p->cyclicBufferSize
+      && *(cur - d4) == *cur
+      && *(cur - d4 + 3) == *(cur + 3))
+  {
+    maxLen = 4;
+    distances[offset + 1] = d4 - 1;
+    offset += 2;
+    d2 = d4;
+  }
+  
+  if (offset != 0)
+  {
+    UPDATE_maxLen
+    distances[offset - 2] = maxLen;
+    if (maxLen == lenLimit)
+    {
+      p->son[p->cyclicBufferPos] = curMatch;
+      MOVE_POS_RET;
+    }
+  }
+  
+  if (maxLen < 4)
+    maxLen = 4;
+
+  offset = (UInt32)(Hc_GetMatchesSpec(lenLimit, curMatch, MF_PARAMS(p),
+      distances + offset, maxLen) - (distances));
+  MOVE_POS_RET
+}
+*/
+
 UInt32 Hc3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances)
 {
   UInt32 offset;
   GET_MATCHES_HEADER(3)
   HASH_ZIP_CALC;
-  curMatch = p->hash[hashValue];
-  p->hash[hashValue] = p->pos;
+  curMatch = p->hash[hv];
+  p->hash[hv] = p->pos;
   offset = (UInt32)(Hc_GetMatchesSpec(lenLimit, curMatch, MF_PARAMS(p),
-    distances, 2) - (distances));
+      distances, 2) - (distances));
   MOVE_POS_RET
 }
 
@@ -652,8 +858,8 @@ static void Bt2_MatchFinder_Skip(CMatchFinder *p, UInt32 num)
   {
     SKIP_HEADER(2)
     HASH2_CALC;
-    curMatch = p->hash[hashValue];
-    p->hash[hashValue] = p->pos;
+    curMatch = p->hash[hv];
+    p->hash[hv] = p->pos;
     SKIP_FOOTER
   }
   while (--num != 0);
@@ -665,8 +871,8 @@ void Bt3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num)
   {
     SKIP_HEADER(3)
     HASH_ZIP_CALC;
-    curMatch = p->hash[hashValue];
-    p->hash[hashValue] = p->pos;
+    curMatch = p->hash[hv];
+    p->hash[hv] = p->pos;
     SKIP_FOOTER
   }
   while (--num != 0);
@@ -676,12 +882,14 @@ static void Bt3_MatchFinder_Skip(CMatchFinder *p, UInt32 num)
 {
   do
   {
-    UInt32 hash2Value;
+    UInt32 h2;
+    UInt32 *hash;
     SKIP_HEADER(3)
     HASH3_CALC;
-    curMatch = p->hash[kFix3HashSize + hashValue];
-    p->hash[hash2Value] =
-    p->hash[kFix3HashSize + hashValue] = p->pos;
+    hash = p->hash;
+    curMatch = hash[kFix3HashSize + hv];
+    hash[h2] =
+    hash[kFix3HashSize + hv] = p->pos;
     SKIP_FOOTER
   }
   while (--num != 0);
@@ -691,43 +899,90 @@ static void Bt4_MatchFinder_Skip(CMatchFinder *p, UInt32 num)
 {
   do
   {
-    UInt32 hash2Value, hash3Value;
+    UInt32 h2, h3;
+    UInt32 *hash;
     SKIP_HEADER(4)
     HASH4_CALC;
-    curMatch = p->hash[kFix4HashSize + hashValue];
-    p->hash[                hash2Value] =
-    p->hash[kFix3HashSize + hash3Value] = p->pos;
-    p->hash[kFix4HashSize + hashValue] = p->pos;
+    hash = p->hash;
+    curMatch = hash[kFix4HashSize + hv];
+    hash[                h2] =
+    hash[kFix3HashSize + h3] =
+    hash[kFix4HashSize + hv] = p->pos;
     SKIP_FOOTER
   }
   while (--num != 0);
 }
 
+/*
+static void Bt5_MatchFinder_Skip(CMatchFinder *p, UInt32 num)
+{
+  do
+  {
+    UInt32 h2, h3, h4;
+    UInt32 *hash;
+    SKIP_HEADER(5)
+    HASH5_CALC;
+    hash = p->hash;
+    curMatch = hash[kFix5HashSize + hv];
+    hash[                h2] =
+    hash[kFix3HashSize + h3] =
+    hash[kFix4HashSize + h4] =
+    hash[kFix5HashSize + hv] = p->pos;
+    SKIP_FOOTER
+  }
+  while (--num != 0);
+}
+*/
+
 static void Hc4_MatchFinder_Skip(CMatchFinder *p, UInt32 num)
 {
   do
   {
-    UInt32 hash2Value, hash3Value;
+    UInt32 h2, h3;
+    UInt32 *hash;
     SKIP_HEADER(4)
     HASH4_CALC;
-    curMatch = p->hash[kFix4HashSize + hashValue];
-    p->hash[                hash2Value] =
-    p->hash[kFix3HashSize + hash3Value] =
-    p->hash[kFix4HashSize + hashValue] = p->pos;
+    hash = p->hash;
+    curMatch = hash[kFix4HashSize + hv];
+    hash[                h2] =
+    hash[kFix3HashSize + h3] =
+    hash[kFix4HashSize + hv] = p->pos;
     p->son[p->cyclicBufferPos] = curMatch;
     MOVE_POS
   }
   while (--num != 0);
 }
 
+/*
+static void Hc5_MatchFinder_Skip(CMatchFinder *p, UInt32 num)
+{
+  do
+  {
+    UInt32 h2, h3, h4;
+    UInt32 *hash;
+    SKIP_HEADER(5)
+    HASH5_CALC;
+    hash = p->hash;
+    curMatch = p->hash[kFix5HashSize + hv];
+    hash[                h2] =
+    hash[kFix3HashSize + h3] =
+    hash[kFix4HashSize + h4] =
+    hash[kFix5HashSize + hv] = p->pos;
+    p->son[p->cyclicBufferPos] = curMatch;
+    MOVE_POS
+  }
+  while (--num != 0);
+}
+*/
+
 void Hc3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num)
 {
   do
   {
     SKIP_HEADER(3)
     HASH_ZIP_CALC;
-    curMatch = p->hash[hashValue];
-    p->hash[hashValue] = p->pos;
+    curMatch = p->hash[hv];
+    p->hash[hv] = p->pos;
     p->son[p->cyclicBufferPos] = curMatch;
     MOVE_POS
   }
@@ -737,13 +992,22 @@ void Hc3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num)
 void MatchFinder_CreateVTable(CMatchFinder *p, IMatchFinder *vTable)
 {
   vTable->Init = (Mf_Init_Func)MatchFinder_Init;
-  vTable->GetIndexByte = (Mf_GetIndexByte_Func)MatchFinder_GetIndexByte;
   vTable->GetNumAvailableBytes = (Mf_GetNumAvailableBytes_Func)MatchFinder_GetNumAvailableBytes;
   vTable->GetPointerToCurrentPos = (Mf_GetPointerToCurrentPos_Func)MatchFinder_GetPointerToCurrentPos;
   if (!p->btMode)
   {
-    vTable->GetMatches = (Mf_GetMatches_Func)Hc4_MatchFinder_GetMatches;
-    vTable->Skip = (Mf_Skip_Func)Hc4_MatchFinder_Skip;
+    /* if (p->numHashBytes <= 4) */
+    {
+      vTable->GetMatches = (Mf_GetMatches_Func)Hc4_MatchFinder_GetMatches;
+      vTable->Skip = (Mf_Skip_Func)Hc4_MatchFinder_Skip;
+    }
+    /*
+    else
+    {
+      vTable->GetMatches = (Mf_GetMatches_Func)Hc5_MatchFinder_GetMatches;
+      vTable->Skip = (Mf_Skip_Func)Hc5_MatchFinder_Skip;
+    }
+    */
   }
   else if (p->numHashBytes == 2)
   {
@@ -755,9 +1019,16 @@ void MatchFinder_CreateVTable(CMatchFinder *p, IMatchFinder *vTable)
     vTable->GetMatches = (Mf_GetMatches_Func)Bt3_MatchFinder_GetMatches;
     vTable->Skip = (Mf_Skip_Func)Bt3_MatchFinder_Skip;
   }
-  else
+  else /* if (p->numHashBytes == 4) */
   {
     vTable->GetMatches = (Mf_GetMatches_Func)Bt4_MatchFinder_GetMatches;
     vTable->Skip = (Mf_Skip_Func)Bt4_MatchFinder_Skip;
   }
+  /*
+  else
+  {
+    vTable->GetMatches = (Mf_GetMatches_Func)Bt5_MatchFinder_GetMatches;
+    vTable->Skip = (Mf_Skip_Func)Bt5_MatchFinder_Skip;
+  }
+  */
 }