/*
LzmaDecode.c
LZMA Decoder
LZMA SDK 4.01 Copyright (c) 1999-2004 Igor Pavlov (2004-02-15)
*/
#include "LzmaDecode.h"
#ifndef Byte
#define Byte unsigned char
#endif
#define kNumTopBits 24
#define kTopValue ((UInt32)1 << kNumTopBits)
#define kNumBitModelTotalBits 11
#define kBitModelTotal (1 << kNumBitModelTotalBits)
#define kNumMoveBits 5
typedef struct _CRangeDecoder
{
Byte *Buffer;
Byte *BufferLim;
UInt32 Range;
UInt32 Code;
#ifdef _LZMA_IN_CB
ILzmaInCallback *InCallback;
int Result;
#endif
int ExtraBytes;
} CRangeDecoder;
Byte RangeDecoderReadByte(CRangeDecoder *rd)
{
if (rd->Buffer == rd->BufferLim)
{
#ifdef _LZMA_IN_CB
UInt32 size;
rd->Result = rd->InCallback->Read(rd->InCallback, &rd->Buffer, &size);
rd->BufferLim = rd->Buffer + size;
if (size == 0)
#endif
{
rd->ExtraBytes = 1;
return 0xFF;
}
}
return (*rd->Buffer++);
}
/* #define ReadByte (*rd->Buffer++) */
#define ReadByte (RangeDecoderReadByte(rd))
void RangeDecoderInit(CRangeDecoder *rd,
#ifdef _LZMA_IN_CB
ILzmaInCallback *inCallback
#else
Byte *stream, UInt32 bufferSize
#endif
)
{
int i;
#ifdef _LZMA_IN_CB
rd->InCallback = inCallback;
rd->Buffer = rd->BufferLim = 0;
#else
rd->Buffer = stream;
rd->BufferLim = stream + bufferSize;
#endif
rd->ExtraBytes = 0;
rd->Code = 0;
rd->Range = (0xFFFFFFFF);
for(i = 0; i < 5; i++)
rd->Code = (rd->Code << 8) | ReadByte;
}
#define RC_INIT_VAR UInt32 range = rd->Range; UInt32 code = rd->Code;
#define RC_FLUSH_VAR rd->Range = range; rd->Code = code;
#define RC_NORMALIZE if (range < kTopValue) { range <<= 8; code = (code << 8) | ReadByte; }
UInt32 RangeDecoderDecodeDirectBits(CRangeDecoder *rd, int numTotalBits)
{
RC_INIT_VAR
UInt32 result = 0;
int i;
for (i = numTotalBits; i > 0; i--)
{
/* UInt32 t; */
range >>= 1;
result <<= 1;
if (code >= range)
{
code -= range;
result |= 1;
}
/*
t = (code - range) >> 31;
t &= 1;
code -= range & (t - 1);
result = (result + result) | (1 - t);
*/
RC_NORMALIZE
}
RC_FLUSH_VAR
return result;
}
int RangeDecoderBitDecode(CProb *prob, CRangeDecoder *rd)
{
UInt32 bound = (rd->Range >> kNumBitModelTotalBits) * *prob;
if (rd->Code < bound)
{
rd->Range = bound;
*prob += (kBitModelTotal - *prob) >> kNumMoveBits;
if (rd->Range < kTopValue)
{
rd->Code = (rd->Code << 8) | ReadByte;
rd->Range <<= 8;
}
return 0;
}
else
{
rd->Range -= bound;
rd->Code -= bound;
*prob -= (*prob) >> kNumMoveBits;
if (rd->Range < kTopValue)
{
rd->Code = (rd->Code << 8) | ReadByte;
rd->Range <<= 8;
}
return 1;
}
}
#define RC_GET_BIT2(prob, mi, A0, A1) \
UInt32 bound = (range >> kNumBitModelTotalBits) * *prob; \
if (code < bound) \
{ A0; range = bound; *prob += (kBitModelTotal - *prob) >> kNumMoveBits; mi <<= 1; } \
else \
{ A1; range -= bound; code -= bound; *prob -= (*prob) >> kNumMoveBits; mi = (mi + mi) + 1; } \
RC_NORMALIZE
#define RC_GET_BIT(prob, mi) RC_GET_BIT2(prob, mi, ; , ;)
int RangeDecoderBitTreeDecode(CProb *probs, int numLevels, CRangeDecoder *rd)
{
int mi = 1;
int i;
#ifdef _LZMA_LOC_OPT
RC_INIT_VAR
#endif
for(i = numLevels; i > 0; i--)
{
#ifdef _LZMA_LOC_OPT
CProb *prob = probs + mi;
RC_GET_BIT(prob, mi)
#else
mi = (mi + mi) + RangeDecoderBitDecode(probs + mi, rd);
#endif
}
#ifdef _LZMA_LOC_OPT
RC_FLUSH_VAR
#endif
return mi - (1 << numLevels);
}
int RangeDecoderReverseBitTreeDecode(CProb *probs, int numLevels, CRangeDecoder *rd)
{
int mi = 1;
int i;
int symbol = 0;
#ifdef _LZMA_LOC_OPT
RC_INIT_VAR
#endif
for(i = 0; i < numLevels; i++)
{
#ifdef _LZMA_LOC_OPT
CProb *prob = probs + mi;
RC_GET_BIT2(prob, mi, ; , symbol |= (1 << i))
#else
int bit = RangeDecoderBitDecode(probs + mi, rd);
mi = mi + mi + bit;
symbol |= (bit << i);
#endif
}
#ifdef _LZMA_LOC_OPT
RC_FLUSH_VAR
#endif
return symbol;
}
Byte LzmaLiteralDecode(CProb *probs, CRangeDecoder *rd)
{
int symbol = 1;
#ifdef _LZMA_LOC_OPT
RC_INIT_VAR
#endif
do
{
#ifdef _LZMA_LOC_OPT
CProb *prob = probs + symbol;
RC_GET_BIT(prob, symbol)
#else
symbol = (symbol + symbol) | RangeDecoderBitDecode(probs + symbol, rd);
#endif
}
while (symbol < 0x100);
#ifdef _LZMA_LOC_OPT
RC_FLUSH_VAR
#endif
return symbol;
}
Byte LzmaLiteralDecodeMatch(CProb *probs, CRangeDecoder *rd, Byte matchByte)
{
int symbol = 1;
#ifdef _LZMA_LOC_OPT
RC_INIT_VAR
#endif
do
{
int bit;
int matchBit = (matchByte >> 7) & 1;
matchByte <<= 1;
#ifdef _LZMA_LOC_OPT
{
CProb *prob = probs + ((1 + matchBit) << 8) + symbol;
RC_GET_BIT2(prob, symbol, bit = 0, bit = 1)
}
#else
bit = RangeDecoderBitDecode(probs + ((1 + matchBit) << 8) + symbol, rd);
symbol = (symbol << 1) | bit;
#endif
if (matchBit != bit)
{
while (symbol < 0x100)
{
#ifdef _LZMA_LOC_OPT
CProb *prob = probs + symbol;
RC_GET_BIT(prob, symbol)
#else
symbol = (symbol + symbol) | RangeDecoderBitDecode(probs + symbol, rd);
#endif
}
break;
}
}
while (symbol < 0x100);
#ifdef _LZMA_LOC_OPT
RC_FLUSH_VAR
#endif
return symbol;
}
#define kNumPosBitsMax 4
#define kNumPosStatesMax (1 << kNumPosBitsMax)
#define kLenNumLowBits 3
#define kLenNumLowSymbols (1 << kLenNumLowBits)
#define kLenNumMidBits 3
#define kLenNumMidSymbols (1 << kLenNumMidBits)
#define kLenNumHighBits 8
#define kLenNumHighSymbols (1 << kLenNumHighBits)
#define LenChoice 0
#define LenChoice2 (LenChoice + 1)
#define LenLow (LenChoice2 + 1)
#define LenMid (LenLow + (kNumPosStatesMax << kLenNumLowBits))
#define LenHigh (LenMid + (kNumPosStatesMax << kLenNumMidBits))
#define kNumLenProbs (LenHigh + kLenNumHighSymbols)
int LzmaLenDecode(CProb *p, CRangeDecoder *rd, int posState)
{
if(RangeDecoderBitDecode(p + LenChoice, rd) == 0)
return RangeDecoderBitTreeDecode(p + LenLow +
(posState << kLenNumLowBits), kLenNumLowBits, rd);
if(RangeDecoderBitDecode(p + LenChoice2, rd) == 0)
return kLenNumLowSymbols + RangeDecoderBitTreeDecode(p + LenMid +
(posState << kLenNumMidBits), kLenNumMidBits, rd);
return kLenNumLowSymbols + kLenNumMidSymbols +
RangeDecoderBitTreeDecode(p + LenHigh, kLenNumHighBits, rd);
}
#define kNumStates 12
#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 IsMatch 0
#define IsRep (IsMatch + (kNumStates << kNumPosBitsMax))
#define IsRepG0 (IsRep + kNumStates)
#define IsRepG1 (IsRepG0 + kNumStates)
#define IsRepG2 (IsRepG1 + kNumStates)
#define IsRep0Long (IsRepG2 + kNumStates)
#define PosSlot (IsRep0Long + (kNumStates << kNumPosBitsMax))
#define SpecPos (PosSlot + (kNumLenToPosStates << kNumPosSlotBits))
#define Align (SpecPos + kNumFullDistances - kEndPosModelIndex)
#define LenCoder (Align + kAlignTableSize)
#define RepLenCoder (LenCoder + kNumLenProbs)
#define Literal (RepLenCoder + kNumLenProbs)
#if Literal != LZMA_BASE_SIZE
StopCompilingDueBUG
#endif
#ifdef _LZMA_OUT_READ
typedef struct _LzmaVarState
{
CRangeDecoder RangeDecoder;
Byte *Dictionary;
UInt32 DictionarySize;
UInt32 DictionaryPos;
UInt32 GlobalPos;
UInt32 Reps[4];
int lc;
int lp;
int pb;
int State;
int PreviousIsMatch;
int RemainLen;
} LzmaVarState;
int LzmaDecoderInit(
unsigned char *buffer, UInt32 bufferSize,
int lc, int lp, int pb,
unsigned char *dictionary, UInt32 dictionarySize,
#ifdef _LZMA_IN_CB
ILzmaInCallback *inCallback
#else
unsigned char *inStream, UInt32 inSize
#endif
)
{
LzmaVarState *vs = (LzmaVarState *)buffer;
CProb *p = (CProb *)(buffer + sizeof(LzmaVarState));
UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (lc + lp));
UInt32 i;
if (bufferSize < numProbs * sizeof(CProb) + sizeof(LzmaVarState))
return LZMA_RESULT_NOT_ENOUGH_MEM;
vs->Dictionary = dictionary;
vs->DictionarySize = dictionarySize;
vs->DictionaryPos = 0;
vs->GlobalPos = 0;
vs->Reps[0] = vs->Reps[1] = vs->Reps[2] = vs->Reps[3] = 1;
vs->lc = lc;
vs->lp = lp;
vs->pb = pb;
vs->State = 0;
vs->PreviousIsMatch = 0;
vs->RemainLen = 0;
dictionary[dictionarySize - 1] = 0;
for (i = 0; i < numProbs; i++)
p[i] = kBitModelTotal >> 1;
RangeDecoderInit(&vs->RangeDecoder,
#ifdef _LZMA_IN_CB
inCallback
#else
inStream, inSize
#endif
);
return LZMA_RESULT_OK;
}
int LzmaDecode(unsigned char *buffer,
unsigned char *outStream, UInt32 outSize,
UInt32 *outSizeProcessed)
{
LzmaVarState *vs = (LzmaVarState *)buffer;
CProb *p = (CProb *)(buffer + sizeof(LzmaVarState));
CRangeDecoder rd = vs->RangeDecoder;
int state = vs->State;
int previousIsMatch = vs->PreviousIsMatch;
Byte previousByte;
UInt32 rep0 = vs->Reps[0], rep1 = vs->Reps[1], rep2 = vs->Reps[2], rep3 = vs->Reps[3];
UInt32 nowPos = 0;
UInt32 posStateMask = (1 << (vs->pb)) - 1;
UInt32 literalPosMask = (1 << (vs->lp)) - 1;
int lc = vs->lc;
int len = vs->RemainLen;
UInt32 globalPos = vs->GlobalPos;
Byte *dictionary = vs->Dictionary;
UInt32 dictionarySize = vs->DictionarySize;
UInt32 dictionaryPos = vs->DictionaryPos;
if (len == -1)
{
*outSizeProcessed = 0;
return LZMA_RESULT_OK;
}
while(len > 0 && nowPos < outSize)
{
UInt32 pos = dictionaryPos - rep0;
if (pos >= dictionarySize)
pos += dictionarySize;
outStream[nowPos++] = dictionary[dictionaryPos] = dictionary[pos];
if (++dictionaryPos == dictionarySize)
dictionaryPos = 0;
len--;
}
if (dictionaryPos == 0)
previousByte = dictionary[dictionarySize - 1];
else
previousByte = dictionary[dictionaryPos - 1];
#else
int LzmaDecode(
Byte *buffer, UInt32 bufferSize,
int lc, int lp, int pb,
#ifdef _LZMA_IN_CB
ILzmaInCallback *inCallback,
#else
unsigned char *inStream, UInt32 inSize,
#endif
unsigned char *outStream, UInt32 outSize,
UInt32 *outSizeProcessed)
{
UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (lc + lp));
CProb *p = (CProb *)buffer;
CRangeDecoder rd;
UInt32 i;
int state = 0;
int previousIsMatch = 0;
Byte previousByte = 0;
UInt32 rep0 = 1, rep1 = 1, rep2 = 1, rep3 = 1;
UInt32 nowPos = 0;
UInt32 posStateMask = (1 << pb) - 1;
UInt32 literalPosMask = (1 << lp) - 1;
int len = 0;
if (bufferSize < numProbs * sizeof(CProb))
return LZMA_RESULT_NOT_ENOUGH_MEM;
for (i = 0; i < numProbs; i++)
p[i] = kBitModelTotal >> 1;
RangeDecoderInit(&rd,
#ifdef _LZMA_IN_CB
inCallback
#else
inStream, inSize
#endif
);
#endif
*outSizeProcessed = 0;
while(nowPos < outSize)
{
int posState = (int)(
(nowPos
#ifdef _LZMA_OUT_READ
+ globalPos
#endif
)
& posStateMask);
#ifdef _LZMA_IN_CB
if (rd.Result != LZMA_RESULT_OK)
return rd.Result;
#endif
if (rd.ExtraBytes != 0)
return LZMA_RESULT_DATA_ERROR;
if (RangeDecoderBitDecode(p + IsMatch + (state << kNumPosBitsMax) + posState, &rd) == 0)
{
CProb *probs = p + Literal + (LZMA_LIT_SIZE *
(((
(nowPos
#ifdef _LZMA_OUT_READ
+ globalPos
#endif
)
& literalPosMask) << lc) + (previousByte >> (8 - lc))));
if (state < 4) state = 0;
else if (state < 10) state -= 3;
else state -= 6;
if (previousIsMatch)
{
Byte matchByte;
#ifdef _LZMA_OUT_READ
UInt32 pos = dictionaryPos - rep0;
if (pos >= dictionarySize)
pos += dictionarySize;
matchByte = dictionary[pos];
#else
matchByte = outStream[nowPos - rep0];
#endif
previousByte = LzmaLiteralDecodeMatch(probs, &rd, matchByte);
previousIsMatch = 0;
}
else
previousByte = LzmaLiteralDecode(probs, &rd);
outStream[nowPos++] = previousByte;
#ifdef _LZMA_OUT_READ
dictionary[dictionaryPos] = previousByte;
if (++dictionaryPos == dictionarySize)
dictionaryPos = 0;
#endif
}
else
{
previousIsMatch = 1;
if (RangeDecoderBitDecode(p + IsRep + state, &rd) == 1)
{
if (RangeDecoderBitDecode(p + IsRepG0 + state, &rd) == 0)
{
if (RangeDecoderBitDecode(p + IsRep0Long + (state << kNumPosBitsMax) + posState, &rd) == 0)
{
#ifdef _LZMA_OUT_READ
UInt32 pos;
#endif
if (
(nowPos
#ifdef _LZMA_OUT_READ
+ globalPos
#endif
)
== 0)
return LZMA_RESULT_DATA_ERROR;
state = state < 7 ? 9 : 11;
#ifdef _LZMA_OUT_READ
pos = dictionaryPos - rep0;
if (pos >= dictionarySize)
pos += dictionarySize;
previousByte = dictionary[pos];
dictionary[dictionaryPos] = previousByte;
if (++dictionaryPos == dictionarySize)
dictionaryPos = 0;
#else
previousByte = outStream[nowPos - rep0];
#endif
outStream[nowPos++] = previousByte;
continue;
}
}
else
{
UInt32 distance;
if(RangeDecoderBitDecode(p + IsRepG1 + state, &rd) == 0)
distance = rep1;
else
{
if(RangeDecoderBitDecode(p + IsRepG2 + state, &rd) == 0)
distance = rep2;
else
{
distance = rep3;
rep3 = rep2;
}
rep2 = rep1;
}
rep1 = rep0;
rep0 = distance;
}
len = LzmaLenDecode(p + RepLenCoder, &rd, posState);
state = state < 7 ? 8 : 11;
}
else
{
int posSlot;
rep3 = rep2;
rep2 = rep1;
rep1 = rep0;
state = state < 7 ? 7 : 10;
len = LzmaLenDecode(p + LenCoder, &rd, posState);
posSlot = RangeDecoderBitTreeDecode(p + PosSlot +
((len < kNumLenToPosStates ? len : kNumLenToPosStates - 1) <<
kNumPosSlotBits), kNumPosSlotBits, &rd);
if (posSlot >= kStartPosModelIndex)
{
int numDirectBits = ((posSlot >> 1) - 1);
rep0 = ((2 | ((UInt32)posSlot & 1)) << numDirectBits);
if (posSlot < kEndPosModelIndex)
{
rep0 += RangeDecoderReverseBitTreeDecode(
p + SpecPos + rep0 - posSlot - 1, numDirectBits, &rd);
}
else
{
rep0 += RangeDecoderDecodeDirectBits(&rd,
numDirectBits - kNumAlignBits) << kNumAlignBits;
rep0 += RangeDecoderReverseBitTreeDecode(p + Align, kNumAlignBits, &rd);
}
}
else
rep0 = posSlot;
rep0++;
}
if (rep0 == (UInt32)(0))
{
/* it's for stream version */
len = -1;
break;
}
if (rep0 > nowPos
#ifdef _LZMA_OUT_READ
+ globalPos
#endif
)
{
return LZMA_RESULT_DATA_ERROR;
}
len += kMatchMinLen;
do
{
#ifdef _LZMA_OUT_READ
UInt32 pos = dictionaryPos - rep0;
if (pos >= dictionarySize)
pos += dictionarySize;
previousByte = dictionary[pos];
dictionary[dictionaryPos] = previousByte;
if (++dictionaryPos == dictionarySize)
dictionaryPos = 0;
#else
previousByte = outStream[nowPos - rep0];
#endif
outStream[nowPos++] = previousByte;
len--;
}
while(len > 0 && nowPos < outSize);
}
}
#ifdef _LZMA_OUT_READ
vs->RangeDecoder = rd;
vs->DictionaryPos = dictionaryPos;
vs->GlobalPos = globalPos + nowPos;
vs->Reps[0] = rep0;
vs->Reps[1] = rep1;
vs->Reps[2] = rep2;
vs->Reps[3] = rep3;
vs->State = state;
vs->PreviousIsMatch = previousIsMatch;
vs->RemainLen = len;
#endif
*outSizeProcessed = nowPos;
return LZMA_RESULT_OK;
}