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hashcat/deps/LZMA-SDK/C/LzFind.c

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/* LzFind.c -- Match finder for LZ algorithms
2021-04-01 : Igor Pavlov : Public domain */
#include "Precomp.h"
#include <string.h>
#include "CpuArch.h"
#include "LzFind.h"
#include "LzHash.h"
#define kEmptyHashValue 0
#define kMaxValForNormalize ((UInt32)0xFFFFFFFF)
#define kNormalizeStepMin (1 << 10) /* it must be power of 2 */
#define kNormalizeMask (~(UInt32)(kNormalizeStepMin - 1))
#define kMaxHistorySize ((UInt32)7 << 29)
// #define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size)
#define kFix5HashSize kFix4HashSize
/*
HASH2_CALC:
if (hv) match, then cur[0] and cur[1] also match
*/
#define HASH2_CALC hv = GetUi16(cur);
// (crc[0 ... 255] & 0xFF) provides one-to-one correspondence to [0 ... 255]
/*
HASH3_CALC:
if (cur[0]) and (h2) match, then cur[1] also match
if (cur[0]) and (hv) match, then cur[1] and cur[2] also match
*/
#define HASH3_CALC { \
UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
h2 = temp & (kHash2Size - 1); \
hv = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; }
#define HASH4_CALC { \
UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
h2 = temp & (kHash2Size - 1); \
temp ^= ((UInt32)cur[2] << 8); \
h3 = temp & (kHash3Size - 1); \
hv = (temp ^ (p->crc[cur[3]] << kLzHash_CrcShift_1)) & p->hashMask; }
#define HASH5_CALC { \
UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
h2 = temp & (kHash2Size - 1); \
temp ^= ((UInt32)cur[2] << 8); \
h3 = temp & (kHash3Size - 1); \
temp ^= (p->crc[cur[3]] << kLzHash_CrcShift_1); \
/* h4 = temp & p->hash4Mask; */ /* (kHash4Size - 1); */ \
hv = (temp ^ (p->crc[cur[4]] << kLzHash_CrcShift_2)) & p->hashMask; }
#define HASH_ZIP_CALC hv = ((cur[2] | ((UInt32)cur[0] << 8)) ^ p->crc[cur[1]]) & 0xFFFF;
static void LzInWindow_Free(CMatchFinder *p, ISzAllocPtr alloc)
{
if (!p->directInput)
{
ISzAlloc_Free(alloc, p->bufferBase);
p->bufferBase = NULL;
}
}
/* keepSizeBefore + keepSizeAfter + keepSizeReserv must be < 4G) */
static int LzInWindow_Create(CMatchFinder *p, UInt32 keepSizeReserv, ISzAllocPtr alloc)
{
UInt32 blockSize = p->keepSizeBefore + p->keepSizeAfter + keepSizeReserv;
if (p->directInput)
{
p->blockSize = blockSize;
return 1;
}
if (!p->bufferBase || p->blockSize != blockSize)
{
LzInWindow_Free(p, alloc);
p->blockSize = blockSize;
p->bufferBase = (Byte *)ISzAlloc_Alloc(alloc, (size_t)blockSize);
}
return (p->bufferBase != NULL);
}
static Byte *MatchFinder_GetPointerToCurrentPos(CMatchFinder *p) { return p->buffer; }
static UInt32 MatchFinder_GetNumAvailableBytes(CMatchFinder *p) { return p->streamPos - p->pos; }
void MatchFinder_ReduceOffsets(CMatchFinder *p, UInt32 subValue)
{
p->posLimit -= subValue;
p->pos -= subValue;
p->streamPos -= subValue;
}
static void MatchFinder_ReadBlock(CMatchFinder *p)
{
if (p->streamEndWasReached || p->result != SZ_OK)
return;
/* We use (p->streamPos - p->pos) value. (p->streamPos < p->pos) is allowed. */
if (p->directInput)
{
UInt32 curSize = 0xFFFFFFFF - (p->streamPos - p->pos);
if (curSize > p->directInputRem)
curSize = (UInt32)p->directInputRem;
p->directInputRem -= curSize;
p->streamPos += curSize;
if (p->directInputRem == 0)
p->streamEndWasReached = 1;
return;
}
for (;;)
{
Byte *dest = p->buffer + (p->streamPos - p->pos);
size_t size = (size_t)(p->bufferBase + p->blockSize - dest);
if (size == 0)
return;
p->result = ISeqInStream_Read(p->stream, dest, &size);
if (p->result != SZ_OK)
return;
if (size == 0)
{
p->streamEndWasReached = 1;
return;
}
p->streamPos += (UInt32)size;
if (p->streamPos - p->pos > p->keepSizeAfter)
return;
}
}
void MatchFinder_MoveBlock(CMatchFinder *p)
{
memmove(p->bufferBase,
p->buffer - p->keepSizeBefore,
(size_t)(p->streamPos - p->pos) + p->keepSizeBefore);
p->buffer = p->bufferBase + p->keepSizeBefore;
}
int MatchFinder_NeedMove(CMatchFinder *p)
{
if (p->directInput)
return 0;
/* if (p->streamEndWasReached) return 0; */
return ((size_t)(p->bufferBase + p->blockSize - p->buffer) <= p->keepSizeAfter);
}
void MatchFinder_ReadIfRequired(CMatchFinder *p)
{
if (p->streamEndWasReached)
return;
if (p->keepSizeAfter >= p->streamPos - p->pos)
MatchFinder_ReadBlock(p);
}
static void MatchFinder_CheckAndMoveAndRead(CMatchFinder *p)
{
if (MatchFinder_NeedMove(p))
MatchFinder_MoveBlock(p);
MatchFinder_ReadBlock(p);
}
static void MatchFinder_SetDefaultSettings(CMatchFinder *p)
{
p->cutValue = 32;
p->btMode = 1;
p->numHashBytes = 4;
p->bigHash = 0;
}
#define kCrcPoly 0xEDB88320
void MatchFinder_Construct(CMatchFinder *p)
{
unsigned i;
p->bufferBase = NULL;
p->directInput = 0;
p->hash = NULL;
p->expectedDataSize = (UInt64)(Int64)-1;
MatchFinder_SetDefaultSettings(p);
for (i = 0; i < 256; i++)
{
UInt32 r = (UInt32)i;
unsigned j;
for (j = 0; j < 8; j++)
r = (r >> 1) ^ (kCrcPoly & ((UInt32)0 - (r & 1)));
p->crc[i] = r;
}
}
static void MatchFinder_FreeThisClassMemory(CMatchFinder *p, ISzAllocPtr alloc)
{
ISzAlloc_Free(alloc, p->hash);
p->hash = NULL;
}
void MatchFinder_Free(CMatchFinder *p, ISzAllocPtr alloc)
{
MatchFinder_FreeThisClassMemory(p, alloc);
LzInWindow_Free(p, alloc);
}
static CLzRef* AllocRefs(size_t num, ISzAllocPtr alloc)
{
size_t sizeInBytes = (size_t)num * sizeof(CLzRef);
if (sizeInBytes / sizeof(CLzRef) != num)
return NULL;
return (CLzRef *)ISzAlloc_Alloc(alloc, sizeInBytes);
}
int MatchFinder_Create(CMatchFinder *p, UInt32 historySize,
UInt32 keepAddBufferBefore, UInt32 matchMaxLen, UInt32 keepAddBufferAfter,
ISzAllocPtr alloc)
{
UInt32 sizeReserv;
if (historySize > kMaxHistorySize)
{
MatchFinder_Free(p, alloc);
return 0;
}
sizeReserv = historySize >> 1;
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;
UInt32 hs;
p->matchMaxLen = matchMaxLen;
{
// UInt32 hs4;
p->fixedHashSize = 0;
hs = (1 << 16) - 1;
if (p->numHashBytes != 2)
{
hs = historySize;
if (hs > p->expectedDataSize)
hs = (UInt32)p->expectedDataSize;
if (hs != 0)
hs--;
hs |= (hs >> 1);
hs |= (hs >> 2);
hs |= (hs >> 4);
hs |= (hs >> 8);
// we propagated 16 bits in (hs). Low 16 bits must be set later
hs >>= 1;
if (hs >= (1 << 24))
{
if (p->numHashBytes == 3)
hs = (1 << 24) - 1;
else
hs >>= 1;
/* if (bigHash) mode, GetHeads4b() in LzFindMt.c needs (hs >= ((1 << 24) - 1))) */
}
// hs = ((UInt32)1 << 25) - 1; // for test
// (hash_size >= (1 << 16)) : Required for (numHashBytes > 2)
hs |= (1 << 16) - 1; /* don't change it! */
// bt5: we adjust the size with recommended minimum size
if (p->numHashBytes >= 5)
hs |= (256 << kLzHash_CrcShift_2) - 1;
}
p->hashMask = hs;
hs++;
/*
hs4 = (1 << 20);
if (hs4 > hs)
hs4 = hs;
// hs4 = (1 << 16); // for test
p->hash4Mask = hs4 - 1;
*/
if (p->numHashBytes > 2) p->fixedHashSize += kHash2Size;
if (p->numHashBytes > 3) p->fixedHashSize += kHash3Size;
// if (p->numHashBytes > 4) p->fixedHashSize += hs4; // kHash4Size;
hs += p->fixedHashSize;
}
{
size_t newSize;
size_t numSons;
p->historySize = historySize;
p->hashSizeSum = hs;
p->cyclicBufferSize = newCyclicBufferSize;
numSons = newCyclicBufferSize;
if (p->btMode)
numSons <<= 1;
newSize = hs + numSons;
// aligned size is not required here, but it can be better for some loops
#define NUM_REFS_ALIGN_MASK 0xF
newSize = (newSize + NUM_REFS_ALIGN_MASK) & ~(size_t)NUM_REFS_ALIGN_MASK;
if (p->hash && p->numRefs == newSize)
return 1;
MatchFinder_FreeThisClassMemory(p, alloc);
p->numRefs = newSize;
p->hash = AllocRefs(newSize, alloc);
if (p->hash)
{
p->son = p->hash + p->hashSizeSum;
return 1;
}
}
}
MatchFinder_Free(p, alloc);
return 0;
}
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)
limit2 = 1;
}
else
limit2 -= p->keepSizeAfter;
if (limit2 < limit)
limit = limit2;
{
UInt32 lenLimit = p->streamPos - p->pos;
if (lenLimit > p->matchMaxLen)
lenLimit = p->matchMaxLen;
p->lenLimit = lenLimit;
}
p->posLimit = p->pos + limit;
}
void MatchFinder_Init_LowHash(CMatchFinder *p)
{
size_t i;
CLzRef *items = p->hash;
size_t numItems = p->fixedHashSize;
for (i = 0; i < numItems; i++)
items[i] = kEmptyHashValue;
}
void MatchFinder_Init_HighHash(CMatchFinder *p)
{
size_t i;
CLzRef *items = p->hash + p->fixedHashSize;
size_t numItems = (size_t)p->hashMask + 1;
for (i = 0; i < numItems; i++)
items[i] = kEmptyHashValue;
}
void MatchFinder_Init_3(CMatchFinder *p, int readData)
{
p->cyclicBufferPos = 0;
p->buffer = p->bufferBase;
p->pos =
p->streamPos = p->cyclicBufferSize;
p->result = SZ_OK;
p->streamEndWasReached = 0;
if (readData)
MatchFinder_ReadBlock(p);
MatchFinder_SetLimits(p);
}
void MatchFinder_Init(CMatchFinder *p)
{
MatchFinder_Init_HighHash(p);
MatchFinder_Init_LowHash(p);
MatchFinder_Init_3(p, True);
}
static UInt32 MatchFinder_GetSubValue(CMatchFinder *p)
{
return (p->pos - p->historySize - 1) & kNormalizeMask;
}
void MatchFinder_Normalize3(UInt32 subValue, CLzRef *items, size_t numItems)
{
if (numItems == 0)
return;
{
const CLzRef *lim = items + numItems - 1;
for (; items < lim; items += 2)
{
UInt32 v, m;
v = items[0]; m = v - subValue; if (v < subValue) m = kEmptyHashValue;
v = items[1]; items[0] = m; m = v - subValue; if (v < subValue) m = kEmptyHashValue;
items[1] = m;
}
if (items == lim)
{
UInt32 v, m;
v = items[0]; m = v - subValue; if (v < subValue) m = kEmptyHashValue;
items[0] = m;
}
}
}
static void MatchFinder_Normalize(CMatchFinder *p)
{
UInt32 subValue = MatchFinder_GetSubValue(p);
MatchFinder_Normalize3(subValue, p->hash, p->numRefs);
MatchFinder_ReduceOffsets(p, subValue);
}
MY_NO_INLINE
static void MatchFinder_CheckLimits(CMatchFinder *p)
{
if (p->pos == kMaxValForNormalize)
MatchFinder_Normalize(p);
if (!p->streamEndWasReached && p->keepSizeAfter == p->streamPos - p->pos)
MatchFinder_CheckAndMoveAndRead(p);
if (p->cyclicBufferPos == p->cyclicBufferSize)
p->cyclicBufferPos = 0;
MatchFinder_SetLimits(p);
}
/*
(lenLimit > maxLen)
*/
MY_FORCE_INLINE
static UInt32 * Hc_GetMatchesSpec(unsigned lenLimit, UInt32 curMatch, UInt32 pos, const Byte *cur, CLzRef *son,
UInt32 _cyclicBufferPos, UInt32 _cyclicBufferSize, UInt32 cutValue,
UInt32 *distances, unsigned maxLen)
{
/*
son[_cyclicBufferPos] = curMatch;
for (;;)
{
UInt32 delta = pos - curMatch;
if (cutValue-- == 0 || delta >= _cyclicBufferSize)
return distances;
{
const Byte *pb = cur - delta;
curMatch = son[_cyclicBufferPos - delta + ((delta > _cyclicBufferPos) ? _cyclicBufferSize : 0)];
if (pb[maxLen] == cur[maxLen] && *pb == *cur)
{
UInt32 len = 0;
while (++len != lenLimit)
if (pb[len] != cur[len])
break;
if (maxLen < len)
{
maxLen = len;
*distances++ = len;
*distances++ = delta - 1;
if (len == lenLimit)
return distances;
}
}
}
}
*/
const Byte *lim = cur + lenLimit;
son[_cyclicBufferPos] = curMatch;
do
{
UInt32 delta = pos - curMatch;
if (delta >= _cyclicBufferSize)
break;
{
ptrdiff_t diff;
curMatch = son[_cyclicBufferPos - delta + ((delta > _cyclicBufferPos) ? _cyclicBufferSize : 0)];
diff = (ptrdiff_t)0 - (ptrdiff_t)delta;
if (cur[maxLen] == cur[(ptrdiff_t)maxLen + diff])
{
const Byte *c = cur;
while (*c == c[diff])
{
if (++c == lim)
{
distances[0] = (UInt32)(lim - cur);
distances[1] = delta - 1;
return distances + 2;
}
}
{
unsigned len = (unsigned)(c - cur);
if (maxLen < len)
{
maxLen = len;
distances[0] = (UInt32)len;
distances[1] = delta - 1;
distances += 2;
}
}
}
}
}
while (--cutValue);
return distances;
}
MY_FORCE_INLINE
UInt32 * GetMatchesSpec1(UInt32 lenLimit, UInt32 curMatch, UInt32 pos, const Byte *cur, CLzRef *son,
UInt32 _cyclicBufferPos, UInt32 _cyclicBufferSize, UInt32 cutValue,
UInt32 *distances, UInt32 maxLen)
{
CLzRef *ptr0 = son + ((size_t)_cyclicBufferPos << 1) + 1;
CLzRef *ptr1 = son + ((size_t)_cyclicBufferPos << 1);
unsigned len0 = 0, len1 = 0;
for (;;)
{
UInt32 delta = pos - curMatch;
if (cutValue-- == 0 || delta >= _cyclicBufferSize)
{
*ptr0 = *ptr1 = kEmptyHashValue;
return distances;
}
{
CLzRef *pair = son + ((size_t)(_cyclicBufferPos - delta + ((delta > _cyclicBufferPos) ? _cyclicBufferSize : 0)) << 1);
const Byte *pb = cur - delta;
unsigned len = (len0 < len1 ? len0 : len1);
UInt32 pair0 = pair[0];
if (pb[len] == cur[len])
{
if (++len != lenLimit && pb[len] == cur[len])
while (++len != lenLimit)
if (pb[len] != cur[len])
break;
if (maxLen < len)
{
maxLen = (UInt32)len;
*distances++ = (UInt32)len;
*distances++ = delta - 1;
if (len == lenLimit)
{
*ptr1 = pair0;
*ptr0 = pair[1];
return distances;
}
}
}
if (pb[len] < cur[len])
{
*ptr1 = curMatch;
ptr1 = pair + 1;
curMatch = *ptr1;
len1 = len;
}
else
{
*ptr0 = curMatch;
ptr0 = pair;
curMatch = *ptr0;
len0 = len;
}
}
}
}
static void SkipMatchesSpec(UInt32 lenLimit, UInt32 curMatch, UInt32 pos, const Byte *cur, CLzRef *son,
UInt32 _cyclicBufferPos, UInt32 _cyclicBufferSize, UInt32 cutValue)
{
CLzRef *ptr0 = son + ((size_t)_cyclicBufferPos << 1) + 1;
CLzRef *ptr1 = son + ((size_t)_cyclicBufferPos << 1);
unsigned len0 = 0, len1 = 0;
for (;;)
{
UInt32 delta = pos - curMatch;
if (cutValue-- == 0 || delta >= _cyclicBufferSize)
{
*ptr0 = *ptr1 = kEmptyHashValue;
return;
}
{
CLzRef *pair = son + ((size_t)(_cyclicBufferPos - delta + ((delta > _cyclicBufferPos) ? _cyclicBufferSize : 0)) << 1);
const Byte *pb = cur - delta;
unsigned len = (len0 < len1 ? len0 : len1);
if (pb[len] == cur[len])
{
while (++len != lenLimit)
if (pb[len] != cur[len])
break;
{
if (len == lenLimit)
{
*ptr1 = pair[0];
*ptr0 = pair[1];
return;
}
}
}
if (pb[len] < cur[len])
{
*ptr1 = curMatch;
ptr1 = pair + 1;
curMatch = *ptr1;
len1 = len;
}
else
{
*ptr0 = curMatch;
ptr0 = pair;
curMatch = *ptr0;
len0 = len;
}
}
}
}
#define MOVE_POS \
++p->cyclicBufferPos; \
p->buffer++; \
if (++p->pos == p->posLimit) MatchFinder_CheckLimits(p);
#define MOVE_POS_RET MOVE_POS return (UInt32)offset;
static void MatchFinder_MovePos(CMatchFinder *p) { MOVE_POS; }
#define GET_MATCHES_HEADER2(minLen, ret_op) \
unsigned lenLimit; UInt32 hv; const Byte *cur; UInt32 curMatch; \
lenLimit = (unsigned)p->lenLimit; { if (lenLimit < minLen) { MatchFinder_MovePos(p); ret_op; }} \
cur = p->buffer;
#define GET_MATCHES_HEADER(minLen) GET_MATCHES_HEADER2(minLen, return 0)
#define SKIP_HEADER(minLen) GET_MATCHES_HEADER2(minLen, continue)
#define MF_PARAMS(p) p->pos, p->buffer, p->son, p->cyclicBufferPos, p->cyclicBufferSize, p->cutValue
#define GET_MATCHES_FOOTER_BASE(_maxLen_, func) \
offset = (unsigned)(func((UInt32)lenLimit, curMatch, MF_PARAMS(p), \
distances + offset, (UInt32)(_maxLen_)) - distances); MOVE_POS_RET;
#define GET_MATCHES_FOOTER_BT(_maxLen_) \
GET_MATCHES_FOOTER_BASE(_maxLen_, GetMatchesSpec1)
#define GET_MATCHES_FOOTER_HC(_maxLen_) \
GET_MATCHES_FOOTER_BASE(_maxLen_, Hc_GetMatchesSpec)
#define SKIP_FOOTER \
SkipMatchesSpec((UInt32)lenLimit, curMatch, MF_PARAMS(p)); MOVE_POS;
#define UPDATE_maxLen { \
ptrdiff_t diff = (ptrdiff_t)0 - (ptrdiff_t)d2; \
const Byte *c = cur + maxLen; \
const Byte *lim = cur + lenLimit; \
for (; c != lim; c++) if (*(c + diff) != *c) break; \
maxLen = (unsigned)(c - cur); }
static UInt32 Bt2_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances)
{
unsigned offset;
GET_MATCHES_HEADER(2)
HASH2_CALC;
curMatch = p->hash[hv];
p->hash[hv] = p->pos;
offset = 0;
GET_MATCHES_FOOTER_BT(1)
}
UInt32 Bt3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances)
{
unsigned offset;
GET_MATCHES_HEADER(3)
HASH_ZIP_CALC;
curMatch = p->hash[hv];
p->hash[hv] = p->pos;
offset = 0;
GET_MATCHES_FOOTER_BT(2)
}
static UInt32 Bt3_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances)
{
UInt32 h2, d2, pos;
unsigned maxLen, offset;
UInt32 *hash;
GET_MATCHES_HEADER(3)
HASH3_CALC;
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 (d2 < p->cyclicBufferSize && *(cur - d2) == *cur)
{
UPDATE_maxLen
distances[0] = (UInt32)maxLen;
distances[1] = d2 - 1;
offset = 2;
if (maxLen == lenLimit)
{
SkipMatchesSpec((UInt32)lenLimit, curMatch, MF_PARAMS(p));
MOVE_POS_RET;
}
}
GET_MATCHES_FOOTER_BT(maxLen)
}
static UInt32 Bt4_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances)
{
UInt32 h2, h3, d2, d3, pos;
unsigned maxLen, offset;
UInt32 *hash;
GET_MATCHES_HEADER(4)
HASH4_CALC;
hash = p->hash;
pos = p->pos;
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 = 3;
offset = 0;
for (;;)
{
if (d2 < p->cyclicBufferSize && *(cur - d2) == *cur)
{
distances[0] = 2;
distances[1] = d2 - 1;
offset = 2;
if (*(cur - d2 + 2) == cur[2])
{
// distances[0] = 3;
}
else if (d3 < p->cyclicBufferSize && *(cur - d3) == *cur)
{
d2 = d3;
distances[2 + 1] = d3 - 1;
offset = 4;
}
else
break;
}
else if (d3 < p->cyclicBufferSize && *(cur - d3) == *cur)
{
d2 = d3;
distances[1] = d3 - 1;
offset = 2;
}
else
break;
UPDATE_maxLen
distances[(size_t)offset - 2] = (UInt32)maxLen;
if (maxLen == lenLimit)
{
SkipMatchesSpec((UInt32)lenLimit, curMatch, MF_PARAMS(p));
MOVE_POS_RET
}
break;
}
GET_MATCHES_FOOTER_BT(maxLen)
}
static UInt32 Bt5_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances)
{
UInt32 h2, h3, d2, d3, 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 = 4;
offset = 0;
for (;;)
{
if (d2 < p->cyclicBufferSize && *(cur - d2) == *cur)
{
distances[0] = 2;
distances[1] = d2 - 1;
offset = 2;
if (*(cur - d2 + 2) == cur[2])
{
}
else if (d3 < p->cyclicBufferSize && *(cur - d3) == *cur)
{
distances[3] = d3 - 1;
offset = 4;
d2 = d3;
}
else
break;
}
else if (d3 < p->cyclicBufferSize && *(cur - d3) == *cur)
{
distances[1] = d3 - 1;
offset = 2;
d2 = d3;
}
else
break;
distances[(size_t)offset - 2] = 3;
if (*(cur - d2 + 3) != cur[3])
break;
UPDATE_maxLen
distances[(size_t)offset - 2] = maxLen;
if (maxLen == lenLimit)
{
SkipMatchesSpec(lenLimit, curMatch, MF_PARAMS(p));
MOVE_POS_RET;
}
break;
}
GET_MATCHES_FOOTER_BT(maxLen)
}
static UInt32 Hc4_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances)
{
UInt32 h2, h3, d2, d3, pos;
unsigned maxLen, offset;
UInt32 *hash;
GET_MATCHES_HEADER(4)
HASH4_CALC;
hash = p->hash;
pos = p->pos;
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 = 3;
offset = 0;
for (;;)
{
if (d2 < p->cyclicBufferSize && *(cur - d2) == *cur)
{
distances[0] = 2;
distances[1] = d2 - 1;
offset = 2;
if (*(cur - d2 + 2) == cur[2])
{
// distances[0] = 3;
}
else if (d3 < p->cyclicBufferSize && *(cur - d3) == *cur)
{
d2 = d3;
distances[2 + 1] = d3 - 1;
offset = 4;
}
else
break;
}
else if (d3 < p->cyclicBufferSize && *(cur - d3) == *cur)
{
d2 = d3;
distances[1] = d3 - 1;
offset = 2;
}
else
break;
UPDATE_maxLen
distances[(size_t)offset - 2] = (UInt32)maxLen;
if (maxLen == lenLimit)
{
p->son[p->cyclicBufferPos] = curMatch;
MOVE_POS_RET;
}
break;
}
GET_MATCHES_FOOTER_HC(maxLen);
}
static UInt32 Hc5_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances)
{
UInt32 h2, h3, d2, d3, 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 = 4;
offset = 0;
for (;;)
{
if (d2 < p->cyclicBufferSize && *(cur - d2) == *cur)
{
distances[0] = 2;
distances[1] = d2 - 1;
offset = 2;
if (*(cur - d2 + 2) == cur[2])
{
}
else if (d3 < p->cyclicBufferSize && *(cur - d3) == *cur)
{
distances[3] = d3 - 1;
offset = 4;
d2 = d3;
}
else
break;
}
else if (d3 < p->cyclicBufferSize && *(cur - d3) == *cur)
{
distances[1] = d3 - 1;
offset = 2;
d2 = d3;
}
else
break;
distances[(size_t)offset - 2] = 3;
if (*(cur - d2 + 3) != cur[3])
break;
UPDATE_maxLen
distances[(size_t)offset - 2] = maxLen;
if (maxLen == lenLimit)
{
p->son[p->cyclicBufferPos] = curMatch;
MOVE_POS_RET;
}
break;
}
GET_MATCHES_FOOTER_HC(maxLen);
}
UInt32 Hc3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances)
{
unsigned offset;
GET_MATCHES_HEADER(3)
HASH_ZIP_CALC;
curMatch = p->hash[hv];
p->hash[hv] = p->pos;
offset = 0;
GET_MATCHES_FOOTER_HC(2)
}
static void Bt2_MatchFinder_Skip(CMatchFinder *p, UInt32 num)
{
do
{
SKIP_HEADER(2)
HASH2_CALC;
curMatch = p->hash[hv];
p->hash[hv] = p->pos;
SKIP_FOOTER
}
while (--num != 0);
}
void Bt3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num)
{
do
{
SKIP_HEADER(3)
HASH_ZIP_CALC;
curMatch = p->hash[hv];
p->hash[hv] = p->pos;
SKIP_FOOTER
}
while (--num != 0);
}
static void Bt3_MatchFinder_Skip(CMatchFinder *p, UInt32 num)
{
do
{
UInt32 h2;
UInt32 *hash;
SKIP_HEADER(3)
HASH3_CALC;
hash = p->hash;
curMatch = (hash + kFix3HashSize)[hv];
hash[h2] =
(hash + kFix3HashSize)[hv] = p->pos;
SKIP_FOOTER
}
while (--num != 0);
}
static void Bt4_MatchFinder_Skip(CMatchFinder *p, UInt32 num)
{
do
{
UInt32 h2, h3;
UInt32 *hash;
SKIP_HEADER(4)
HASH4_CALC;
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;
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 h2, h3;
UInt32 *hash;
SKIP_HEADER(4)
HASH4_CALC;
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;
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;
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[hv];
p->hash[hv] = p->pos;
p->son[p->cyclicBufferPos] = curMatch;
MOVE_POS
}
while (--num != 0);
}
void MatchFinder_CreateVTable(CMatchFinder *p, IMatchFinder *vTable)
{
vTable->Init = (Mf_Init_Func)MatchFinder_Init;
vTable->GetNumAvailableBytes = (Mf_GetNumAvailableBytes_Func)MatchFinder_GetNumAvailableBytes;
vTable->GetPointerToCurrentPos = (Mf_GetPointerToCurrentPos_Func)MatchFinder_GetPointerToCurrentPos;
if (!p->btMode)
{
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)
{
vTable->GetMatches = (Mf_GetMatches_Func)Bt2_MatchFinder_GetMatches;
vTable->Skip = (Mf_Skip_Func)Bt2_MatchFinder_Skip;
}
else if (p->numHashBytes == 3)
{
vTable->GetMatches = (Mf_GetMatches_Func)Bt3_MatchFinder_GetMatches;
vTable->Skip = (Mf_Skip_Func)Bt3_MatchFinder_Skip;
}
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;
}
}
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