mirror of
https://github.com/ZDoom/gzdoom-gles.git
synced 2024-12-11 04:51:13 +00:00
1044 lines
24 KiB
C
1044 lines
24 KiB
C
/* LzFind.c -- Match finder for LZ algorithms
|
|
2015-10-15 : Igor Pavlov : Public domain */
|
|
|
|
#include "Precomp.h"
|
|
|
|
#include <string.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 kStartMaxLen 3
|
|
|
|
static void LzInWindow_Free(CMatchFinder *p, ISzAlloc *alloc)
|
|
{
|
|
if (!p->directInput)
|
|
{
|
|
alloc->Free(alloc, p->bufferBase);
|
|
p->bufferBase = NULL;
|
|
}
|
|
}
|
|
|
|
/* keepSizeBefore + keepSizeAfter + keepSizeReserv must be < 4G) */
|
|
|
|
static int LzInWindow_Create(CMatchFinder *p, UInt32 keepSizeReserv, ISzAlloc *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 *)alloc->Alloc(alloc, (size_t)blockSize);
|
|
}
|
|
return (p->bufferBase != NULL);
|
|
}
|
|
|
|
Byte *MatchFinder_GetPointerToCurrentPos(CMatchFinder *p) { return p->buffer; }
|
|
|
|
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 = (p->bufferBase + p->blockSize - dest);
|
|
if (size == 0)
|
|
return;
|
|
|
|
p->result = p->stream->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)
|
|
{
|
|
UInt32 i;
|
|
p->bufferBase = NULL;
|
|
p->directInput = 0;
|
|
p->hash = NULL;
|
|
MatchFinder_SetDefaultSettings(p);
|
|
|
|
for (i = 0; i < 256; i++)
|
|
{
|
|
UInt32 r = i;
|
|
unsigned j;
|
|
for (j = 0; j < 8; j++)
|
|
r = (r >> 1) ^ (kCrcPoly & ~((r & 1) - 1));
|
|
p->crc[i] = r;
|
|
}
|
|
}
|
|
|
|
static void MatchFinder_FreeThisClassMemory(CMatchFinder *p, ISzAlloc *alloc)
|
|
{
|
|
alloc->Free(alloc, p->hash);
|
|
p->hash = NULL;
|
|
}
|
|
|
|
void MatchFinder_Free(CMatchFinder *p, ISzAlloc *alloc)
|
|
{
|
|
MatchFinder_FreeThisClassMemory(p, alloc);
|
|
LzInWindow_Free(p, alloc);
|
|
}
|
|
|
|
static CLzRef* AllocRefs(size_t num, ISzAlloc *alloc)
|
|
{
|
|
size_t sizeInBytes = (size_t)num * sizeof(CLzRef);
|
|
if (sizeInBytes / sizeof(CLzRef) != num)
|
|
return NULL;
|
|
return (CLzRef *)alloc->Alloc(alloc, sizeInBytes);
|
|
}
|
|
|
|
int MatchFinder_Create(CMatchFinder *p, UInt32 historySize,
|
|
UInt32 keepAddBufferBefore, UInt32 matchMaxLen, UInt32 keepAddBufferAfter,
|
|
ISzAlloc *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;
|
|
{
|
|
p->fixedHashSize = 0;
|
|
if (p->numHashBytes == 2)
|
|
hs = (1 << 16) - 1;
|
|
else
|
|
{
|
|
hs = historySize - 1;
|
|
hs |= (hs >> 1);
|
|
hs |= (hs >> 2);
|
|
hs |= (hs >> 4);
|
|
hs |= (hs >> 8);
|
|
hs >>= 1;
|
|
hs |= 0xFFFF; /* don't change it! It's required for Deflate */
|
|
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))) */
|
|
}
|
|
}
|
|
p->hashMask = hs;
|
|
hs++;
|
|
if (p->numHashBytes > 2) p->fixedHashSize += kHash2Size;
|
|
if (p->numHashBytes > 3) p->fixedHashSize += kHash3Size;
|
|
if (p->numHashBytes > 4) p->fixedHashSize += 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;
|
|
|
|
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_2(CMatchFinder *p, int readData)
|
|
{
|
|
UInt32 i;
|
|
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;
|
|
p->result = SZ_OK;
|
|
p->streamEndWasReached = 0;
|
|
|
|
if (readData)
|
|
MatchFinder_ReadBlock(p);
|
|
|
|
MatchFinder_SetLimits(p);
|
|
}
|
|
|
|
void MatchFinder_Init(CMatchFinder *p)
|
|
{
|
|
MatchFinder_Init_2(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)
|
|
{
|
|
size_t i;
|
|
for (i = 0; i < numItems; i++)
|
|
{
|
|
UInt32 value = items[i];
|
|
if (value <= subValue)
|
|
value = kEmptyHashValue;
|
|
else
|
|
value -= subValue;
|
|
items[i] = value;
|
|
}
|
|
}
|
|
|
|
static void MatchFinder_Normalize(CMatchFinder *p)
|
|
{
|
|
UInt32 subValue = MatchFinder_GetSubValue(p);
|
|
MatchFinder_Normalize3(subValue, p->hash, p->numRefs);
|
|
MatchFinder_ReduceOffsets(p, subValue);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static UInt32 * Hc_GetMatchesSpec(UInt32 lenLimit, UInt32 curMatch, UInt32 pos, const Byte *cur, CLzRef *son,
|
|
UInt32 _cyclicBufferPos, UInt32 _cyclicBufferSize, UInt32 cutValue,
|
|
UInt32 *distances, UInt32 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)
|
|
{
|
|
*distances++ = maxLen = len;
|
|
*distances++ = delta - 1;
|
|
if (len == lenLimit)
|
|
return distances;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
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 + (_cyclicBufferPos << 1) + 1;
|
|
CLzRef *ptr1 = son + (_cyclicBufferPos << 1);
|
|
UInt32 len0 = 0, len1 = 0;
|
|
for (;;)
|
|
{
|
|
UInt32 delta = pos - curMatch;
|
|
if (cutValue-- == 0 || delta >= _cyclicBufferSize)
|
|
{
|
|
*ptr0 = *ptr1 = kEmptyHashValue;
|
|
return distances;
|
|
}
|
|
{
|
|
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];
|
|
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 + (_cyclicBufferPos << 1) + 1;
|
|
CLzRef *ptr1 = son + (_cyclicBufferPos << 1);
|
|
UInt32 len0 = 0, len1 = 0;
|
|
for (;;)
|
|
{
|
|
UInt32 delta = pos - curMatch;
|
|
if (cutValue-- == 0 || delta >= _cyclicBufferSize)
|
|
{
|
|
*ptr0 = *ptr1 = kEmptyHashValue;
|
|
return;
|
|
}
|
|
{
|
|
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])
|
|
{
|
|
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 offset;
|
|
|
|
static void MatchFinder_MovePos(CMatchFinder *p) { MOVE_POS; }
|
|
|
|
#define GET_MATCHES_HEADER2(minLen, ret_op) \
|
|
UInt32 lenLimit; UInt32 hv; const Byte *cur; UInt32 curMatch; \
|
|
lenLimit = 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(offset, maxLen) \
|
|
offset = (UInt32)(GetMatchesSpec1(lenLimit, curMatch, MF_PARAMS(p), \
|
|
distances + offset, maxLen) - distances); MOVE_POS_RET;
|
|
|
|
#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[hv];
|
|
p->hash[hv] = p->pos;
|
|
offset = 0;
|
|
GET_MATCHES_FOOTER(offset, 1)
|
|
}
|
|
|
|
UInt32 Bt3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances)
|
|
{
|
|
UInt32 offset;
|
|
GET_MATCHES_HEADER(3)
|
|
HASH_ZIP_CALC;
|
|
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 h2, d2, maxLen, offset, pos;
|
|
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] = maxLen;
|
|
distances[1] = d2 - 1;
|
|
offset = 2;
|
|
if (maxLen == lenLimit)
|
|
{
|
|
SkipMatchesSpec(lenLimit, curMatch, MF_PARAMS(p));
|
|
MOVE_POS_RET;
|
|
}
|
|
}
|
|
|
|
GET_MATCHES_FOOTER(offset, maxLen)
|
|
}
|
|
|
|
static UInt32 Bt4_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances)
|
|
{
|
|
UInt32 h2, h3, d2, d3, maxLen, offset, pos;
|
|
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 = 0;
|
|
offset = 0;
|
|
|
|
if (d2 < p->cyclicBufferSize && *(cur - d2) == *cur)
|
|
{
|
|
distances[0] = maxLen = 2;
|
|
distances[1] = d2 - 1;
|
|
offset = 2;
|
|
}
|
|
|
|
if (d2 != d3 && d3 < p->cyclicBufferSize && *(cur - d3) == *cur)
|
|
{
|
|
maxLen = 3;
|
|
distances[offset + 1] = d3 - 1;
|
|
offset += 2;
|
|
d2 = d3;
|
|
}
|
|
|
|
if (offset != 0)
|
|
{
|
|
UPDATE_maxLen
|
|
distances[offset - 2] = maxLen;
|
|
if (maxLen == lenLimit)
|
|
{
|
|
SkipMatchesSpec(lenLimit, curMatch, MF_PARAMS(p));
|
|
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 h2, h3, d2, d3, maxLen, offset, pos;
|
|
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 = 0;
|
|
offset = 0;
|
|
|
|
if (d2 < p->cyclicBufferSize && *(cur - d2) == *cur)
|
|
{
|
|
distances[0] = maxLen = 2;
|
|
distances[1] = d2 - 1;
|
|
offset = 2;
|
|
}
|
|
|
|
if (d2 != d3 && d3 < p->cyclicBufferSize && *(cur - d3) == *cur)
|
|
{
|
|
maxLen = 3;
|
|
distances[offset + 1] = d3 - 1;
|
|
offset += 2;
|
|
d2 = d3;
|
|
}
|
|
|
|
if (offset != 0)
|
|
{
|
|
UPDATE_maxLen
|
|
distances[offset - 2] = maxLen;
|
|
if (maxLen == lenLimit)
|
|
{
|
|
p->son[p->cyclicBufferPos] = curMatch;
|
|
MOVE_POS_RET;
|
|
}
|
|
}
|
|
|
|
if (maxLen < 3)
|
|
maxLen = 3;
|
|
|
|
offset = (UInt32)(Hc_GetMatchesSpec(lenLimit, curMatch, MF_PARAMS(p),
|
|
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[hv];
|
|
p->hash[hv] = p->pos;
|
|
offset = (UInt32)(Hc_GetMatchesSpec(lenLimit, curMatch, MF_PARAMS(p),
|
|
distances, 2) - (distances));
|
|
MOVE_POS_RET
|
|
}
|
|
|
|
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, 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 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, 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[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;
|
|
}
|
|
*/
|
|
}
|