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system76-edk2/MdeModulePkg/Library/LzmaCustomDecompressLib/Sdk/C/LzFind.c
Michael Kubacki 1436aea4d5 MdeModulePkg: Apply uncrustify changes 
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3737

Apply uncrustify changes to .c/.h files in the MdeModulePkg package

Cc: Andrew Fish <afish@apple.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
2021-12-07 17:24:28 +00:00

1345 lines
29 KiB
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/* LzFind.c -- Match finder for LZ algorithms
2018-07-08 : Igor Pavlov : Public domain */
#include "Precomp.h"
#ifndef EFIAPI
#include <string.h>
#endif
#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,
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);
}
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 = 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;
{
p->fixedHashSize = 0;
if (p->numHashBytes == 2) {
hs = (1 << 16) - 1;
} else {
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);
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_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
)
{
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);
}
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 - delta;
if (cur[maxLen] == cur[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(offset, maxLen) \
offset = (unsigned)(GetMatchesSpec1((UInt32)lenLimit, curMatch, MF_PARAMS(p), \
distances + offset, (UInt32)maxLen) - distances); MOVE_POS_RET;
#define SKIP_FOOTER \
SkipMatchesSpec((UInt32)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 = (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 (offset, 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 (offset, 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 (offset, 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 = 0;
offset = 0;
if ((d2 < p->cyclicBufferSize) && (*(cur - d2) == *cur)) {
maxLen = 2;
distances[0] = 2;
distances[1] = d2 - 1;
offset = 2;
}
if ((d2 != d3) && (d3 < p->cyclicBufferSize) && (*(cur - d3) == *cur)) {
maxLen = 3;
distances[(size_t)offset + 1] = d3 - 1;
offset += 2;
d2 = d3;
}
if (offset != 0) {
UPDATE_maxLen
distances[(size_t)offset - 2] = (UInt32)maxLen;
if (maxLen == lenLimit) {
SkipMatchesSpec ((UInt32)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[(size_t)offset + 1] = d4 - 1;
offset += 2;
d2 = d4;
}
if (offset != 0)
{
UPDATE_maxLen
distances[(size_t)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, 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 = 0;
offset = 0;
if ((d2 < p->cyclicBufferSize) && (*(cur - d2) == *cur)) {
maxLen = 2;
distances[0] = 2;
distances[1] = d2 - 1;
offset = 2;
}
if ((d2 != d3) && (d3 < p->cyclicBufferSize) && (*(cur - d3) == *cur)) {
maxLen = 3;
distances[(size_t)offset + 1] = d3 - 1;
offset += 2;
d2 = d3;
}
if (offset != 0) {
UPDATE_maxLen
distances[(size_t)offset - 2] = (UInt32)maxLen;
if (maxLen == lenLimit) {
p->son[p->cyclicBufferPos] = curMatch;
MOVE_POS_RET;
}
}
if (maxLen < 3) {
maxLen = 3;
}
offset = (unsigned)(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[(size_t)offset + 1] = d4 - 1;
offset += 2;
d2 = d4;
}
if (offset != 0)
{
UPDATE_maxLen
distances[(size_t)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
)
{
unsigned offset;
GET_MATCHES_HEADER (3)
HASH_ZIP_CALC;
curMatch = p->hash[hv];
p->hash[hv] = p->pos;
offset = (unsigned)(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 = 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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