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LzmaDec.c
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/* LzmaDec.c -- LZMA Decoder
2023-04-07 : Igor Pavlov : Public domain */
#include "Precomp.h"
#include <string.h>
/* #include "CpuArch.h" */
#include "LzmaDec.h"
// #define kNumTopBits 24
#define kTopValue ((UInt32)1 << 24)
#define kNumBitModelTotalBits 11
#define kBitModelTotal (1 << kNumBitModelTotalBits)
#define RC_INIT_SIZE 5
#ifndef Z7_LZMA_DEC_OPT
#define kNumMoveBits 5
#define NORMALIZE if (range < kTopValue) { range <<= 8; code = (code << 8) | (*buf++); }
#define IF_BIT_0(p) ttt = *(p); NORMALIZE; bound = (range >> kNumBitModelTotalBits) * (UInt32)ttt; if (code < bound)
#define UPDATE_0(p) range = bound; *(p) = (CLzmaProb)(ttt + ((kBitModelTotal - ttt) >> kNumMoveBits));
#define UPDATE_1(p) range -= bound; code -= bound; *(p) = (CLzmaProb)(ttt - (ttt >> kNumMoveBits));
#define GET_BIT2(p, i, A0, A1) IF_BIT_0(p) \
{ UPDATE_0(p) i = (i + i); A0; } else \
{ UPDATE_1(p) i = (i + i) + 1; A1; }
#define TREE_GET_BIT(probs, i) { GET_BIT2(probs + i, i, ;, ;); }
#define REV_BIT(p, i, A0, A1) IF_BIT_0(p + i) \
{ UPDATE_0(p + i) A0; } else \
{ UPDATE_1(p + i) A1; }
#define REV_BIT_VAR( p, i, m) REV_BIT(p, i, i += m; m += m, m += m; i += m; )
#define REV_BIT_CONST(p, i, m) REV_BIT(p, i, i += m; , i += m * 2; )
#define REV_BIT_LAST( p, i, m) REV_BIT(p, i, i -= m , ; )
#define TREE_DECODE(probs, limit, i) \
{ i = 1; do { TREE_GET_BIT(probs, i); } while (i < limit); i -= limit; }
/* #define Z7_LZMA_SIZE_OPT */
#ifdef Z7_LZMA_SIZE_OPT
#define TREE_6_DECODE(probs, i) TREE_DECODE(probs, (1 << 6), i)
#else
#define TREE_6_DECODE(probs, i) \
{ i = 1; \
TREE_GET_BIT(probs, i) \
TREE_GET_BIT(probs, i) \
TREE_GET_BIT(probs, i) \
TREE_GET_BIT(probs, i) \
TREE_GET_BIT(probs, i) \
TREE_GET_BIT(probs, i) \
i -= 0x40; }
#endif
#define NORMAL_LITER_DEC TREE_GET_BIT(prob, symbol)
#define MATCHED_LITER_DEC \
matchByte += matchByte; \
bit = offs; \
offs &= matchByte; \
probLit = prob + (offs + bit + symbol); \
GET_BIT2(probLit, symbol, offs ^= bit; , ;)
#endif // Z7_LZMA_DEC_OPT
#define NORMALIZE_CHECK if (range < kTopValue) { if (buf >= bufLimit) return DUMMY_INPUT_EOF; range <<= 8; code = (code << 8) | (*buf++); }
#define IF_BIT_0_CHECK(p) ttt = *(p); NORMALIZE_CHECK bound = (range >> kNumBitModelTotalBits) * (UInt32)ttt; if (code < bound)
#define UPDATE_0_CHECK range = bound;
#define UPDATE_1_CHECK range -= bound; code -= bound;
#define GET_BIT2_CHECK(p, i, A0, A1) IF_BIT_0_CHECK(p) \
{ UPDATE_0_CHECK i = (i + i); A0; } else \
{ UPDATE_1_CHECK i = (i + i) + 1; A1; }
#define GET_BIT_CHECK(p, i) GET_BIT2_CHECK(p, i, ; , ;)
#define TREE_DECODE_CHECK(probs, limit, i) \
{ i = 1; do { GET_BIT_CHECK(probs + i, i) } while (i < limit); i -= limit; }
#define REV_BIT_CHECK(p, i, m) IF_BIT_0_CHECK(p + i) \
{ UPDATE_0_CHECK i += m; m += m; } else \
{ UPDATE_1_CHECK m += m; i += m; }
#define kNumPosBitsMax 4
#define kNumPosStatesMax (1 << kNumPosBitsMax)
#define kLenNumLowBits 3
#define kLenNumLowSymbols (1 << kLenNumLowBits)
#define kLenNumHighBits 8
#define kLenNumHighSymbols (1 << kLenNumHighBits)
#define LenLow 0
#define LenHigh (LenLow + 2 * (kNumPosStatesMax << kLenNumLowBits))
#define kNumLenProbs (LenHigh + kLenNumHighSymbols)
#define LenChoice LenLow
#define LenChoice2 (LenLow + (1 << kLenNumLowBits))
#define kNumStates 12
#define kNumStates2 16
#define kNumLitStates 7
#define kStartPosModelIndex 4
#define kEndPosModelIndex 14
#define kNumFullDistances (1 << (kEndPosModelIndex >> 1))
#define kNumPosSlotBits 6
#define kNumLenToPosStates 4
#define kNumAlignBits 4
#define kAlignTableSize (1 << kNumAlignBits)
#define kMatchMinLen 2
#define kMatchSpecLenStart (kMatchMinLen + kLenNumLowSymbols * 2 + kLenNumHighSymbols)
#define kMatchSpecLen_Error_Data (1 << 9)
#define kMatchSpecLen_Error_Fail (kMatchSpecLen_Error_Data - 1)
/* External ASM code needs same CLzmaProb array layout. So don't change it. */
/* (probs_1664) is faster and better for code size at some platforms */
/*
#ifdef MY_CPU_X86_OR_AMD64
*/
#define kStartOffset 1664
#define GET_PROBS p->probs_1664
/*
#define GET_PROBS p->probs + kStartOffset
#else
#define kStartOffset 0
#define GET_PROBS p->probs
#endif
*/
#define SpecPos (-kStartOffset)
#define IsRep0Long (SpecPos + kNumFullDistances)
#define RepLenCoder (IsRep0Long + (kNumStates2 << kNumPosBitsMax))
#define LenCoder (RepLenCoder + kNumLenProbs)
#define IsMatch (LenCoder + kNumLenProbs)
#define Align (IsMatch + (kNumStates2 << kNumPosBitsMax))
#define IsRep (Align + kAlignTableSize)
#define IsRepG0 (IsRep + kNumStates)
#define IsRepG1 (IsRepG0 + kNumStates)
#define IsRepG2 (IsRepG1 + kNumStates)
#define PosSlot (IsRepG2 + kNumStates)
#define Literal (PosSlot + (kNumLenToPosStates << kNumPosSlotBits))
#define NUM_BASE_PROBS (Literal + kStartOffset)
#if Align != 0 && kStartOffset != 0
#error Stop_Compiling_Bad_LZMA_kAlign
#endif
#if NUM_BASE_PROBS != 1984
#error Stop_Compiling_Bad_LZMA_PROBS
#endif
#define LZMA_LIT_SIZE 0x300
#define LzmaProps_GetNumProbs(p) (NUM_BASE_PROBS + ((UInt32)LZMA_LIT_SIZE << ((p)->lc + (p)->lp)))
#define CALC_POS_STATE(processedPos, pbMask) (((processedPos) & (pbMask)) << 4)
#define COMBINED_PS_STATE (posState + state)
#define GET_LEN_STATE (posState)
#define LZMA_DIC_MIN (1 << 12)
/*
p->remainLen : shows status of LZMA decoder:
< kMatchSpecLenStart : the number of bytes to be copied with (p->rep0) offset
= kMatchSpecLenStart : the LZMA stream was finished with end mark
= kMatchSpecLenStart + 1 : need init range coder
= kMatchSpecLenStart + 2 : need init range coder and state
= kMatchSpecLen_Error_Fail : Internal Code Failure
= kMatchSpecLen_Error_Data + [0 ... 273] : LZMA Data Error
*/
/* ---------- LZMA_DECODE_REAL ---------- */
/*
LzmaDec_DecodeReal_3() can be implemented in external ASM file.
3 - is the code compatibility version of that function for check at link time.
*/
#define LZMA_DECODE_REAL LzmaDec_DecodeReal_3
/*
LZMA_DECODE_REAL()
In:
RangeCoder is normalized
if (p->dicPos == limit)
{
LzmaDec_TryDummy() was called before to exclude LITERAL and MATCH-REP cases.
So first symbol can be only MATCH-NON-REP. And if that MATCH-NON-REP symbol
is not END_OF_PAYALOAD_MARKER, then the function doesn't write any byte to dictionary,
the function returns SZ_OK, and the caller can use (p->remainLen) and (p->reps[0]) later.
}
Processing:
The first LZMA symbol will be decoded in any case.
All main checks for limits are at the end of main loop,
It decodes additional LZMA-symbols while (p->buf < bufLimit && dicPos < limit),
RangeCoder is still without last normalization when (p->buf < bufLimit) is being checked.
But if (p->buf < bufLimit), the caller provided at least (LZMA_REQUIRED_INPUT_MAX + 1) bytes for
next iteration before limit (bufLimit + LZMA_REQUIRED_INPUT_MAX),
that is enough for worst case LZMA symbol with one additional RangeCoder normalization for one bit.
So that function never reads bufLimit [LZMA_REQUIRED_INPUT_MAX] byte.
Out:
RangeCoder is normalized
Result:
SZ_OK - OK
p->remainLen:
< kMatchSpecLenStart : the number of bytes to be copied with (p->reps[0]) offset
= kMatchSpecLenStart : the LZMA stream was finished with end mark
SZ_ERROR_DATA - error, when the MATCH-Symbol refers out of dictionary
p->remainLen : undefined
p->reps[*] : undefined
*/
#ifdef Z7_LZMA_DEC_OPT
int Z7_FASTCALL LZMA_DECODE_REAL(CLzmaDec *p, SizeT limit, const Byte *bufLimit);
#else
static
int Z7_FASTCALL LZMA_DECODE_REAL(CLzmaDec *p, SizeT limit, const Byte *bufLimit)
{
CLzmaProb *probs = GET_PROBS;
unsigned state = (unsigned)p->state;
UInt32 rep0 = p->reps[0], rep1 = p->reps[1], rep2 = p->reps[2], rep3 = p->reps[3];
unsigned pbMask = ((unsigned)1 << (p->prop.pb)) - 1;
unsigned lc = p->prop.lc;
unsigned lpMask = ((unsigned)0x100 << p->prop.lp) - ((unsigned)0x100 >> lc);
Byte *dic = p->dic;
SizeT dicBufSize = p->dicBufSize;
SizeT dicPos = p->dicPos;
UInt32 processedPos = p->processedPos;
UInt32 checkDicSize = p->checkDicSize;
unsigned len = 0;
const Byte *buf = p->buf;
UInt32 range = p->range;
UInt32 code = p->code;
do
{
CLzmaProb *prob;
UInt32 bound;
unsigned ttt;
unsigned posState = CALC_POS_STATE(processedPos, pbMask);
prob = probs + IsMatch + COMBINED_PS_STATE;
IF_BIT_0(prob)
{
unsigned symbol;
UPDATE_0(prob)
prob = probs + Literal;
if (processedPos != 0 || checkDicSize != 0)
prob += (UInt32)3 * ((((processedPos << 8) + dic[(dicPos == 0 ? dicBufSize : dicPos) - 1]) & lpMask) << lc);
processedPos++;
if (state < kNumLitStates)
{
state -= (state < 4) ? state : 3;
symbol = 1;
#ifdef Z7_LZMA_SIZE_OPT
do { NORMAL_LITER_DEC } while (symbol < 0x100);
#else
NORMAL_LITER_DEC
NORMAL_LITER_DEC
NORMAL_LITER_DEC
NORMAL_LITER_DEC
NORMAL_LITER_DEC
NORMAL_LITER_DEC
NORMAL_LITER_DEC
NORMAL_LITER_DEC
#endif
}
else
{
unsigned matchByte = dic[dicPos - rep0 + (dicPos < rep0 ? dicBufSize : 0)];
unsigned offs = 0x100;
state -= (state < 10) ? 3 : 6;
symbol = 1;
#ifdef Z7_LZMA_SIZE_OPT
do
{
unsigned bit;
CLzmaProb *probLit;
MATCHED_LITER_DEC
}
while (symbol < 0x100);
#else
{
unsigned bit;
CLzmaProb *probLit;
MATCHED_LITER_DEC
MATCHED_LITER_DEC
MATCHED_LITER_DEC
MATCHED_LITER_DEC
MATCHED_LITER_DEC
MATCHED_LITER_DEC
MATCHED_LITER_DEC
MATCHED_LITER_DEC
}
#endif
}
dic[dicPos++] = (Byte)symbol;
continue;
}
{
UPDATE_1(prob)
prob = probs + IsRep + state;
IF_BIT_0(prob)
{
UPDATE_0(prob)
state += kNumStates;
prob = probs + LenCoder;
}
else
{
UPDATE_1(prob)
prob = probs + IsRepG0 + state;
IF_BIT_0(prob)
{
UPDATE_0(prob)
prob = probs + IsRep0Long + COMBINED_PS_STATE;
IF_BIT_0(prob)
{
UPDATE_0(prob)
// that case was checked before with kBadRepCode
// if (checkDicSize == 0 && processedPos == 0) { len = kMatchSpecLen_Error_Data + 1; break; }
// The caller doesn't allow (dicPos == limit) case here
// so we don't need the following check:
// if (dicPos == limit) { state = state < kNumLitStates ? 9 : 11; len = 1; break; }
dic[dicPos] = dic[dicPos - rep0 + (dicPos < rep0 ? dicBufSize : 0)];
dicPos++;
processedPos++;
state = state < kNumLitStates ? 9 : 11;
continue;
}
UPDATE_1(prob)
}
else
{
UInt32 distance;
UPDATE_1(prob)
prob = probs + IsRepG1 + state;
IF_BIT_0(prob)
{
UPDATE_0(prob)
distance = rep1;
}
else
{
UPDATE_1(prob)
prob = probs + IsRepG2 + state;
IF_BIT_0(prob)
{
UPDATE_0(prob)
distance = rep2;
}
else
{
UPDATE_1(prob)
distance = rep3;
rep3 = rep2;
}
rep2 = rep1;
}
rep1 = rep0;
rep0 = distance;
}
state = state < kNumLitStates ? 8 : 11;
prob = probs + RepLenCoder;
}
#ifdef Z7_LZMA_SIZE_OPT
{
unsigned lim, offset;
CLzmaProb *probLen = prob + LenChoice;
IF_BIT_0(probLen)
{
UPDATE_0(probLen)
probLen = prob + LenLow + GET_LEN_STATE;
offset = 0;
lim = (1 << kLenNumLowBits);
}
else
{
UPDATE_1(probLen)
probLen = prob + LenChoice2;
IF_BIT_0(probLen)
{
UPDATE_0(probLen)
probLen = prob + LenLow + GET_LEN_STATE + (1 << kLenNumLowBits);
offset = kLenNumLowSymbols;
lim = (1 << kLenNumLowBits);
}
else
{
UPDATE_1(probLen)
probLen = prob + LenHigh;
offset = kLenNumLowSymbols * 2;
lim = (1 << kLenNumHighBits);
}
}
TREE_DECODE(probLen, lim, len)
len += offset;
}
#else
{
CLzmaProb *probLen = prob + LenChoice;
IF_BIT_0(probLen)
{
UPDATE_0(probLen)
probLen = prob + LenLow + GET_LEN_STATE;
len = 1;
TREE_GET_BIT(probLen, len)
TREE_GET_BIT(probLen, len)
TREE_GET_BIT(probLen, len)
len -= 8;
}
else
{
UPDATE_1(probLen)
probLen = prob + LenChoice2;
IF_BIT_0(probLen)
{
UPDATE_0(probLen)
probLen = prob + LenLow + GET_LEN_STATE + (1 << kLenNumLowBits);
len = 1;
TREE_GET_BIT(probLen, len)
TREE_GET_BIT(probLen, len)
TREE_GET_BIT(probLen, len)
}
else
{
UPDATE_1(probLen)
probLen = prob + LenHigh;
TREE_DECODE(probLen, (1 << kLenNumHighBits), len)
len += kLenNumLowSymbols * 2;
}
}
}
#endif
if (state >= kNumStates)
{
UInt32 distance;
prob = probs + PosSlot +
((len < kNumLenToPosStates ? len : kNumLenToPosStates - 1) << kNumPosSlotBits);
TREE_6_DECODE(prob, distance)
if (distance >= kStartPosModelIndex)
{
unsigned posSlot = (unsigned)distance;
unsigned numDirectBits = (unsigned)(((distance >> 1) - 1));
distance = (2 | (distance & 1));
if (posSlot < kEndPosModelIndex)
{
distance <<= numDirectBits;
prob = probs + SpecPos;
{
UInt32 m = 1;
distance++;
do
{
REV_BIT_VAR(prob, distance, m)
}
while (--numDirectBits);
distance -= m;
}
}
else
{
numDirectBits -= kNumAlignBits;
do
{
NORMALIZE
range >>= 1;
{
UInt32 t;
code -= range;
t = (0 - ((UInt32)code >> 31)); /* (UInt32)((Int32)code >> 31) */
distance = (distance << 1) + (t + 1);
code += range & t;
}
/*
distance <<= 1;
if (code >= range)
{
code -= range;
distance |= 1;
}
*/
}
while (--numDirectBits);
prob = probs + Align;
distance <<= kNumAlignBits;
{
unsigned i = 1;
REV_BIT_CONST(prob, i, 1)
REV_BIT_CONST(prob, i, 2)
REV_BIT_CONST(prob, i, 4)
REV_BIT_LAST (prob, i, 8)
distance |= i;
}
if (distance == (UInt32)0xFFFFFFFF)
{
len = kMatchSpecLenStart;
state -= kNumStates;
break;
}
}
}
rep3 = rep2;
rep2 = rep1;
rep1 = rep0;
rep0 = distance + 1;
state = (state < kNumStates + kNumLitStates) ? kNumLitStates : kNumLitStates + 3;
if (distance >= (checkDicSize == 0 ? processedPos: checkDicSize))
{
len += kMatchSpecLen_Error_Data + kMatchMinLen;
// len = kMatchSpecLen_Error_Data;
// len += kMatchMinLen;
break;
}
}
len += kMatchMinLen;
{
SizeT rem;
unsigned curLen;
SizeT pos;
if ((rem = limit - dicPos) == 0)
{
/*
We stop decoding and return SZ_OK, and we can resume decoding later.
Any error conditions can be tested later in caller code.
For more strict mode we can stop decoding with error
// len += kMatchSpecLen_Error_Data;
*/
break;
}
curLen = ((rem < len) ? (unsigned)rem : len);
pos = dicPos - rep0 + (dicPos < rep0 ? dicBufSize : 0);
processedPos += (UInt32)curLen;
len -= curLen;
if (curLen <= dicBufSize - pos)
{
Byte *dest = dic + dicPos;
ptrdiff_t src = (ptrdiff_t)pos - (ptrdiff_t)dicPos;
const Byte *lim = dest + curLen;
dicPos += (SizeT)curLen;
do
*(dest) = (Byte)*(dest + src);
while (++dest != lim);
}
else
{
do
{
dic[dicPos++] = dic[pos];
if (++pos == dicBufSize)
pos = 0;
}
while (--curLen != 0);
}
}
}
}
while (dicPos < limit && buf < bufLimit);
NORMALIZE
p->buf = buf;
p->range = range;
p->code = code;
p->remainLen = (UInt32)len; // & (kMatchSpecLen_Error_Data - 1); // we can write real length for error matches too.
p->dicPos = dicPos;
p->processedPos = processedPos;
p->reps[0] = rep0;
p->reps[1] = rep1;
p->reps[2] = rep2;
p->reps[3] = rep3;
p->state = (UInt32)state;
if (len >= kMatchSpecLen_Error_Data)
return SZ_ERROR_DATA;
return SZ_OK;
}
#endif
static void Z7_FASTCALL LzmaDec_WriteRem(CLzmaDec *p, SizeT limit)
{
unsigned len = (unsigned)p->remainLen;
if (len == 0 /* || len >= kMatchSpecLenStart */)
return;
{
SizeT dicPos = p->dicPos;
Byte *dic;
SizeT dicBufSize;
SizeT rep0; /* we use SizeT to avoid the BUG of VC14 for AMD64 */
{
SizeT rem = limit - dicPos;
if (rem < len)
{
len = (unsigned)(rem);
if (len == 0)
return;
}
}
if (p->checkDicSize == 0 && p->prop.dicSize - p->processedPos <= len)
p->checkDicSize = p->prop.dicSize;
p->processedPos += (UInt32)len;
p->remainLen -= (UInt32)len;
dic = p->dic;
rep0 = p->reps[0];
dicBufSize = p->dicBufSize;
do
{
dic[dicPos] = dic[dicPos - rep0 + (dicPos < rep0 ? dicBufSize : 0)];
dicPos++;
}
while (--len);
p->dicPos = dicPos;
}
}
/*
At staring of new stream we have one of the following symbols:
- Literal - is allowed
- Non-Rep-Match - is allowed only if it's end marker symbol
- Rep-Match - is not allowed
We use early check of (RangeCoder:Code) over kBadRepCode to simplify main decoding code
*/
#define kRange0 0xFFFFFFFF
#define kBound0 ((kRange0 >> kNumBitModelTotalBits) << (kNumBitModelTotalBits - 1))
#define kBadRepCode (kBound0 + (((kRange0 - kBound0) >> kNumBitModelTotalBits) << (kNumBitModelTotalBits - 1)))
#if kBadRepCode != (0xC0000000 - 0x400)
#error Stop_Compiling_Bad_LZMA_Check
#endif
/*
LzmaDec_DecodeReal2():
It calls LZMA_DECODE_REAL() and it adjusts limit according (p->checkDicSize).
We correct (p->checkDicSize) after LZMA_DECODE_REAL() and in LzmaDec_WriteRem(),
and we support the following state of (p->checkDicSize):
if (total_processed < p->prop.dicSize) then
{
(total_processed == p->processedPos)
(p->checkDicSize == 0)
}
else
(p->checkDicSize == p->prop.dicSize)
*/
static int Z7_FASTCALL LzmaDec_DecodeReal2(CLzmaDec *p, SizeT limit, const Byte *bufLimit)
{
if (p->checkDicSize == 0)
{
UInt32 rem = p->prop.dicSize - p->processedPos;
if (limit - p->dicPos > rem)
limit = p->dicPos + rem;
}
{
int res = LZMA_DECODE_REAL(p, limit, bufLimit);
if (p->checkDicSize == 0 && p->processedPos >= p->prop.dicSize)
p->checkDicSize = p->prop.dicSize;
return res;
}
}
typedef enum
{
DUMMY_INPUT_EOF, /* need more input data */
DUMMY_LIT,
DUMMY_MATCH,
DUMMY_REP
} ELzmaDummy;
#define IS_DUMMY_END_MARKER_POSSIBLE(dummyRes) ((dummyRes) == DUMMY_MATCH)
static ELzmaDummy LzmaDec_TryDummy(const CLzmaDec *p, const Byte *buf, const Byte **bufOut)
{
UInt32 range = p->range;
UInt32 code = p->code;
const Byte *bufLimit = *bufOut;
const CLzmaProb *probs = GET_PROBS;
unsigned state = (unsigned)p->state;
ELzmaDummy res;
for (;;)
{
const CLzmaProb *prob;
UInt32 bound;
unsigned ttt;
unsigned posState = CALC_POS_STATE(p->processedPos, ((unsigned)1 << p->prop.pb) - 1);
prob = probs + IsMatch + COMBINED_PS_STATE;
IF_BIT_0_CHECK(prob)
{
UPDATE_0_CHECK
prob = probs + Literal;
if (p->checkDicSize != 0 || p->processedPos != 0)
prob += ((UInt32)LZMA_LIT_SIZE *
((((p->processedPos) & (((unsigned)1 << (p->prop.lp)) - 1)) << p->prop.lc) +
((unsigned)p->dic[(p->dicPos == 0 ? p->dicBufSize : p->dicPos) - 1] >> (8 - p->prop.lc))));
if (state < kNumLitStates)
{
unsigned symbol = 1;
do { GET_BIT_CHECK(prob + symbol, symbol) } while (symbol < 0x100);
}
else
{
unsigned matchByte = p->dic[p->dicPos - p->reps[0] +
(p->dicPos < p->reps[0] ? p->dicBufSize : 0)];
unsigned offs = 0x100;
unsigned symbol = 1;
do
{
unsigned bit;
const CLzmaProb *probLit;
matchByte += matchByte;
bit = offs;
offs &= matchByte;
probLit = prob + (offs + bit + symbol);
GET_BIT2_CHECK(probLit, symbol, offs ^= bit; , ; )
}
while (symbol < 0x100);
}
res = DUMMY_LIT;
}
else
{
unsigned len;
UPDATE_1_CHECK
prob = probs + IsRep + state;
IF_BIT_0_CHECK(prob)
{
UPDATE_0_CHECK
state = 0;
prob = probs + LenCoder;
res = DUMMY_MATCH;
}
else
{
UPDATE_1_CHECK
res = DUMMY_REP;
prob = probs + IsRepG0 + state;
IF_BIT_0_CHECK(prob)
{
UPDATE_0_CHECK
prob = probs + IsRep0Long + COMBINED_PS_STATE;
IF_BIT_0_CHECK(prob)
{
UPDATE_0_CHECK
break;
}
else
{
UPDATE_1_CHECK
}
}
else
{
UPDATE_1_CHECK
prob = probs + IsRepG1 + state;
IF_BIT_0_CHECK(prob)
{
UPDATE_0_CHECK
}
else
{
UPDATE_1_CHECK
prob = probs + IsRepG2 + state;
IF_BIT_0_CHECK(prob)
{
UPDATE_0_CHECK
}
else
{
UPDATE_1_CHECK
}
}
}
state = kNumStates;
prob = probs + RepLenCoder;
}
{
unsigned limit, offset;
const CLzmaProb *probLen = prob + LenChoice;
IF_BIT_0_CHECK(probLen)
{
UPDATE_0_CHECK
probLen = prob + LenLow + GET_LEN_STATE;
offset = 0;
limit = 1 << kLenNumLowBits;
}
else
{
UPDATE_1_CHECK
probLen = prob + LenChoice2;
IF_BIT_0_CHECK(probLen)
{
UPDATE_0_CHECK
probLen = prob + LenLow + GET_LEN_STATE + (1 << kLenNumLowBits);
offset = kLenNumLowSymbols;
limit = 1 << kLenNumLowBits;
}
else
{
UPDATE_1_CHECK
probLen = prob + LenHigh;
offset = kLenNumLowSymbols * 2;
limit = 1 << kLenNumHighBits;
}
}
TREE_DECODE_CHECK(probLen, limit, len)
len += offset;
}
if (state < 4)
{
unsigned posSlot;
prob = probs + PosSlot +
((len < kNumLenToPosStates - 1 ? len : kNumLenToPosStates - 1) <<
kNumPosSlotBits);
TREE_DECODE_CHECK(prob, 1 << kNumPosSlotBits, posSlot)
if (posSlot >= kStartPosModelIndex)
{
unsigned numDirectBits = ((posSlot >> 1) - 1);
if (posSlot < kEndPosModelIndex)
{
prob = probs + SpecPos + ((2 | (posSlot & 1)) << numDirectBits);
}
else
{
numDirectBits -= kNumAlignBits;
do
{
NORMALIZE_CHECK
range >>= 1;
code -= range & (((code - range) >> 31) - 1);
/* if (code >= range) code -= range; */
}
while (--numDirectBits);
prob = probs + Align;
numDirectBits = kNumAlignBits;
}
{
unsigned i = 1;
unsigned m = 1;
do
{
REV_BIT_CHECK(prob, i, m)
}
while (--numDirectBits);
}
}
}
}
break;
}
NORMALIZE_CHECK
*bufOut = buf;
return res;
}
void LzmaDec_InitDicAndState(CLzmaDec *p, BoolInt initDic, BoolInt initState);
void LzmaDec_InitDicAndState(CLzmaDec *p, BoolInt initDic, BoolInt initState)
{
p->remainLen = kMatchSpecLenStart + 1;
p->tempBufSize = 0;
if (initDic)
{
p->processedPos = 0;
p->checkDicSize = 0;
p->remainLen = kMatchSpecLenStart + 2;
}
if (initState)
p->remainLen = kMatchSpecLenStart + 2;
}
void LzmaDec_Init(CLzmaDec *p)
{
p->dicPos = 0;
LzmaDec_InitDicAndState(p, True, True);
}
/*
LZMA supports optional end_marker.
So the decoder can lookahead for one additional LZMA-Symbol to check end_marker.
That additional LZMA-Symbol can require up to LZMA_REQUIRED_INPUT_MAX bytes in input stream.
When the decoder reaches dicLimit, it looks (finishMode) parameter:
if (finishMode == LZMA_FINISH_ANY), the decoder doesn't lookahead
if (finishMode != LZMA_FINISH_ANY), the decoder lookahead, if end_marker is possible for current position
When the decoder lookahead, and the lookahead symbol is not end_marker, we have two ways:
1) Strict mode (default) : the decoder returns SZ_ERROR_DATA.
2) The relaxed mode (alternative mode) : we could return SZ_OK, and the caller
must check (status) value. The caller can show the error,
if the end of stream is expected, and the (status) is noit
LZMA_STATUS_FINISHED_WITH_MARK or LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK.
*/
#define RETURN_NOT_FINISHED_FOR_FINISH \
*status = LZMA_STATUS_NOT_FINISHED; \
return SZ_ERROR_DATA; // for strict mode
// return SZ_OK; // for relaxed mode
SRes LzmaDec_DecodeToDic(CLzmaDec *p, SizeT dicLimit, const Byte *src, SizeT *srcLen,
ELzmaFinishMode finishMode, ELzmaStatus *status)
{
SizeT inSize = *srcLen;
(*srcLen) = 0;
*status = LZMA_STATUS_NOT_SPECIFIED;
if (p->remainLen > kMatchSpecLenStart)
{
if (p->remainLen > kMatchSpecLenStart + 2)
return p->remainLen == kMatchSpecLen_Error_Fail ? SZ_ERROR_FAIL : SZ_ERROR_DATA;
for (; inSize > 0 && p->tempBufSize < RC_INIT_SIZE; (*srcLen)++, inSize--)
p->tempBuf[p->tempBufSize++] = *src++;
if (p->tempBufSize != 0 && p->tempBuf[0] != 0)
return SZ_ERROR_DATA;
if (p->tempBufSize < RC_INIT_SIZE)
{
*status = LZMA_STATUS_NEEDS_MORE_INPUT;
return SZ_OK;
}
p->code =
((UInt32)p->tempBuf[1] << 24)
| ((UInt32)p->tempBuf[2] << 16)
| ((UInt32)p->tempBuf[3] << 8)
| ((UInt32)p->tempBuf[4]);
if (p->checkDicSize == 0
&& p->processedPos == 0
&& p->code >= kBadRepCode)
return SZ_ERROR_DATA;
p->range = 0xFFFFFFFF;
p->tempBufSize = 0;
if (p->remainLen > kMatchSpecLenStart + 1)
{
SizeT numProbs = LzmaProps_GetNumProbs(&p->prop);
SizeT i;
CLzmaProb *probs = p->probs;
for (i = 0; i < numProbs; i++)
probs[i] = kBitModelTotal >> 1;
p->reps[0] = p->reps[1] = p->reps[2] = p->reps[3] = 1;
p->state = 0;
}
p->remainLen = 0;
}