/*
LzmaDecode.c
- LZMA Decoder
+ LZMA Decoder (optimized for Speed version)
- LZMA SDK 4.05 Copyright (c) 1999-2004 Igor Pavlov (2004-08-25)
+ LZMA SDK 4.40 Copyright (c) 1999-2006 Igor Pavlov (2006-05-01)
http://www.7-zip.org/
LZMA SDK is licensed under two licenses:
follow rules of that license.
SPECIAL EXCEPTION:
- Igor Pavlov, as the author of this code, expressly permits you to
- statically or dynamically link your code (or bind by name) to the
- interfaces of this file without subjecting your linked code to the
+ Igor Pavlov, as the author of this Code, expressly permits you to
+ statically or dynamically link your Code (or bind by name) to the
+ interfaces of this file without subjecting your linked Code to the
terms of the CPL or GNU LGPL. Any modifications or additions
to this file, however, are subject to the LGPL or CPL terms.
*/
#include "LzmaDecode.h"
-#ifndef Byte
-#define Byte unsigned char
-#endif
-
#define kNumTopBits 24
#define kTopValue ((UInt32)1 << kNumTopBits)
#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 RC_READ_BYTE (*Buffer++)
-/* #define ReadByte (*rd->Buffer++) */
-#define ReadByte (RangeDecoderReadByte(rd))
+#define RC_INIT2 Code = 0; Range = 0xFFFFFFFF; \
+ { int i; for(i = 0; i < 5; i++) { RC_TEST; Code = (Code << 8) | RC_READ_BYTE; }}
-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;
-}
+#ifdef _LZMA_IN_CB
-#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; }
+#define RC_TEST { if (Buffer == BufferLim) \
+ { SizeT size; int result = InCallback->Read(InCallback, &Buffer, &size); if (result != LZMA_RESULT_OK) return result; \
+ BufferLim = Buffer + size; if (size == 0) return LZMA_RESULT_DATA_ERROR; }}
-UInt32 RangeDecoderDecodeDirectBits(CRangeDecoder *rd, int numTotalBits)
-{
- RC_INIT_VAR
- UInt32 result = 0;
- int i;
- for (i = numTotalBits; i > 0; i--)
- {
- /* UInt32 t; */
- range >>= 1;
+#define RC_INIT Buffer = BufferLim = 0; RC_INIT2
- 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;
-}
+#else
-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_TEST { if (Buffer == BufferLim) return LZMA_RESULT_DATA_ERROR; }
-#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_INIT(buffer, bufferSize) Buffer = buffer; BufferLim = buffer + bufferSize; RC_INIT2
+
+#endif
-#define RC_GET_BIT(prob, mi) RC_GET_BIT2(prob, mi, ; , ;)
+#define RC_NORMALIZE if (Range < kTopValue) { RC_TEST; Range <<= 8; Code = (Code << 8) | RC_READ_BYTE; }
-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);
-}
+#define IfBit0(p) RC_NORMALIZE; bound = (Range >> kNumBitModelTotalBits) * *(p); if (Code < bound)
+#define UpdateBit0(p) Range = bound; *(p) += (kBitModelTotal - *(p)) >> kNumMoveBits;
+#define UpdateBit1(p) Range -= bound; Code -= bound; *(p) -= (*(p)) >> kNumMoveBits;
-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;
-}
+#define RC_GET_BIT2(p, mi, A0, A1) IfBit0(p) \
+ { UpdateBit0(p); mi <<= 1; A0; } else \
+ { UpdateBit1(p); mi = (mi + mi) + 1; A1; }
+
+#define RC_GET_BIT(p, mi) RC_GET_BIT2(p, mi, ; , ;)
-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;
-}
+#define RangeDecoderBitTreeDecode(probs, numLevels, res) \
+ { int i = numLevels; res = 1; \
+ do { CProb *p = probs + res; RC_GET_BIT(p, res) } while(--i != 0); \
+ res -= (1 << numLevels); }
-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 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 kNumLitStates 7
#define kStartPosModelIndex 4
#define kEndPosModelIndex 14
StopCompilingDueBUG
#endif
-#ifdef _LZMA_OUT_READ
-
-typedef struct _LzmaVarState
+int LzmaDecodeProperties(CLzmaProperties *propsRes, const unsigned char *propsData, int size)
{
- 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,
+ unsigned char prop0;
+ if (size < LZMA_PROPERTIES_SIZE)
+ return LZMA_RESULT_DATA_ERROR;
+ prop0 = propsData[0];
+ if (prop0 >= (9 * 5 * 5))
+ return LZMA_RESULT_DATA_ERROR;
+ {
+ for (propsRes->pb = 0; prop0 >= (9 * 5); propsRes->pb++, prop0 -= (9 * 5));
+ for (propsRes->lp = 0; prop0 >= 9; propsRes->lp++, prop0 -= 9);
+ propsRes->lc = prop0;
+ /*
+ unsigned char remainder = (unsigned char)(prop0 / 9);
+ propsRes->lc = prop0 % 9;
+ propsRes->pb = remainder / 5;
+ propsRes->lp = remainder % 5;
+ */
+ }
+
+ #ifdef _LZMA_OUT_READ
+ {
+ int i;
+ propsRes->DictionarySize = 0;
+ for (i = 0; i < 4; i++)
+ propsRes->DictionarySize += (UInt32)(propsData[1 + i]) << (i * 8);
+ if (propsRes->DictionarySize == 0)
+ propsRes->DictionarySize = 1;
+ }
+ #endif
+ return LZMA_RESULT_OK;
+}
+
+#define kLzmaStreamWasFinishedId (-1)
+
+int LzmaDecode(CLzmaDecoderState *vs,
#ifdef _LZMA_IN_CB
- ILzmaInCallback *inCallback
+ ILzmaInCallback *InCallback,
#else
- unsigned char *inStream, UInt32 inSize
+ const unsigned char *inStream, SizeT inSize, SizeT *inSizeProcessed,
#endif
- )
+ unsigned char *outStream, SizeT outSize, SizeT *outSizeProcessed)
{
- 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;
-}
+ CProb *p = vs->Probs;
+ SizeT nowPos = 0;
+ Byte previousByte = 0;
+ UInt32 posStateMask = (1 << (vs->Properties.pb)) - 1;
+ UInt32 literalPosMask = (1 << (vs->Properties.lp)) - 1;
+ int lc = vs->Properties.lc;
-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;
+ #ifdef _LZMA_OUT_READ
+
+ UInt32 Range = vs->Range;
+ UInt32 Code = vs->Code;
+ #ifdef _LZMA_IN_CB
+ const Byte *Buffer = vs->Buffer;
+ const Byte *BufferLim = vs->BufferLim;
+ #else
+ const Byte *Buffer = inStream;
+ const Byte *BufferLim = inStream + inSize;
+ #endif
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;
+ UInt32 distanceLimit = vs->DistanceLimit;
Byte *dictionary = vs->Dictionary;
- UInt32 dictionarySize = vs->DictionarySize;
+ UInt32 dictionarySize = vs->Properties.DictionarySize;
UInt32 dictionaryPos = vs->DictionaryPos;
- if (len == -1)
- {
- *outSizeProcessed = 0;
+ Byte tempDictionary[4];
+
+ #ifndef _LZMA_IN_CB
+ *inSizeProcessed = 0;
+ #endif
+ *outSizeProcessed = 0;
+ if (len == kLzmaStreamWasFinishedId)
return LZMA_RESULT_OK;
+
+ if (dictionarySize == 0)
+ {
+ dictionary = tempDictionary;
+ dictionarySize = 1;
+ tempDictionary[0] = vs->TempDictionary[0];
}
- while(len > 0 && nowPos < outSize)
+ if (len == kLzmaNeedInitId)
+ {
+ {
+ UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (lc + vs->Properties.lp));
+ UInt32 i;
+ for (i = 0; i < numProbs; i++)
+ p[i] = kBitModelTotal >> 1;
+ rep0 = rep1 = rep2 = rep3 = 1;
+ state = 0;
+ globalPos = 0;
+ distanceLimit = 0;
+ dictionaryPos = 0;
+ dictionary[dictionarySize - 1] = 0;
+ #ifdef _LZMA_IN_CB
+ RC_INIT;
+ #else
+ RC_INIT(inStream, inSize);
+ #endif
+ }
+ len = 0;
+ }
+ while(len != 0 && nowPos < outSize)
{
UInt32 pos = dictionaryPos - rep0;
if (pos >= dictionarySize)
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;
+ #else /* if !_LZMA_OUT_READ */
+
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
+ const Byte *Buffer;
+ const Byte *BufferLim;
+ UInt32 Range;
+ UInt32 Code;
+ #ifndef _LZMA_IN_CB
+ *inSizeProcessed = 0;
+ #endif
*outSizeProcessed = 0;
+
+ {
+ UInt32 i;
+ UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (lc + vs->Properties.lp));
+ for (i = 0; i < numProbs; i++)
+ p[i] = kBitModelTotal >> 1;
+ }
+
+ #ifdef _LZMA_IN_CB
+ RC_INIT;
+ #else
+ RC_INIT(inStream, inSize);
+ #endif
+
+ #endif /* _LZMA_OUT_READ */
+
while(nowPos < outSize)
{
+ CProb *prob;
+ UInt32 bound;
int posState = (int)(
(nowPos
#ifdef _LZMA_OUT_READ
#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)
+
+ prob = p + IsMatch + (state << kNumPosBitsMax) + posState;
+ IfBit0(prob)
{
- CProb *probs = p + Literal + (LZMA_LIT_SIZE *
+ int symbol = 1;
+ UpdateBit0(prob)
+ prob = p + Literal + (LZMA_LIT_SIZE *
(((
(nowPos
#ifdef _LZMA_OUT_READ
)
& literalPosMask) << lc) + (previousByte >> (8 - lc))));
- if (state < 4) state = 0;
- else if (state < 10) state -= 3;
- else state -= 6;
- if (previousIsMatch)
+ if (state >= kNumLitStates)
{
- Byte matchByte;
+ int matchByte;
#ifdef _LZMA_OUT_READ
UInt32 pos = dictionaryPos - rep0;
if (pos >= dictionarySize)
#else
matchByte = outStream[nowPos - rep0];
#endif
- previousByte = LzmaLiteralDecodeMatch(probs, &rd, matchByte);
- previousIsMatch = 0;
+ do
+ {
+ int bit;
+ CProb *probLit;
+ matchByte <<= 1;
+ bit = (matchByte & 0x100);
+ probLit = prob + 0x100 + bit + symbol;
+ RC_GET_BIT2(probLit, symbol, if (bit != 0) break, if (bit == 0) break)
+ }
+ while (symbol < 0x100);
}
- else
- previousByte = LzmaLiteralDecode(probs, &rd);
+ while (symbol < 0x100)
+ {
+ CProb *probLit = prob + symbol;
+ RC_GET_BIT(probLit, symbol)
+ }
+ previousByte = (Byte)symbol;
+
outStream[nowPos++] = previousByte;
#ifdef _LZMA_OUT_READ
+ if (distanceLimit < dictionarySize)
+ distanceLimit++;
+
dictionary[dictionaryPos] = previousByte;
if (++dictionaryPos == dictionarySize)
dictionaryPos = 0;
#endif
+ if (state < 4) state = 0;
+ else if (state < 10) state -= 3;
+ else state -= 6;
}
else
{
- previousIsMatch = 1;
- if (RangeDecoderBitDecode(p + IsRep + state, &rd) == 1)
+ UpdateBit1(prob);
+ prob = p + IsRep + state;
+ IfBit0(prob)
+ {
+ UpdateBit0(prob);
+ rep3 = rep2;
+ rep2 = rep1;
+ rep1 = rep0;
+ state = state < kNumLitStates ? 0 : 3;
+ prob = p + LenCoder;
+ }
+ else
{
- if (RangeDecoderBitDecode(p + IsRepG0 + state, &rd) == 0)
+ UpdateBit1(prob);
+ prob = p + IsRepG0 + state;
+ IfBit0(prob)
{
- if (RangeDecoderBitDecode(p + IsRep0Long + (state << kNumPosBitsMax) + posState, &rd) == 0)
+ UpdateBit0(prob);
+ prob = p + IsRep0Long + (state << kNumPosBitsMax) + posState;
+ IfBit0(prob)
{
#ifdef _LZMA_OUT_READ
UInt32 pos;
#endif
- if (
- (nowPos
- #ifdef _LZMA_OUT_READ
- + globalPos
- #endif
- )
- == 0)
+ UpdateBit0(prob);
+
+ #ifdef _LZMA_OUT_READ
+ if (distanceLimit == 0)
+ #else
+ if (nowPos == 0)
+ #endif
return LZMA_RESULT_DATA_ERROR;
- state = state < 7 ? 9 : 11;
+
+ state = state < kNumLitStates ? 9 : 11;
#ifdef _LZMA_OUT_READ
pos = dictionaryPos - rep0;
if (pos >= dictionarySize)
previousByte = outStream[nowPos - rep0];
#endif
outStream[nowPos++] = previousByte;
+ #ifdef _LZMA_OUT_READ
+ if (distanceLimit < dictionarySize)
+ distanceLimit++;
+ #endif
+
continue;
}
+ else
+ {
+ UpdateBit1(prob);
+ }
}
else
{
UInt32 distance;
- if(RangeDecoderBitDecode(p + IsRepG1 + state, &rd) == 0)
+ UpdateBit1(prob);
+ prob = p + IsRepG1 + state;
+ IfBit0(prob)
+ {
+ UpdateBit0(prob);
distance = rep1;
+ }
else
{
- if(RangeDecoderBitDecode(p + IsRepG2 + state, &rd) == 0)
+ UpdateBit1(prob);
+ prob = p + IsRepG2 + state;
+ IfBit0(prob)
+ {
+ UpdateBit0(prob);
distance = rep2;
+ }
else
{
+ UpdateBit1(prob);
distance = rep3;
rep3 = rep2;
}
rep1 = rep0;
rep0 = distance;
}
- len = LzmaLenDecode(p + RepLenCoder, &rd, posState);
- state = state < 7 ? 8 : 11;
+ state = state < kNumLitStates ? 8 : 11;
+ prob = p + RepLenCoder;
}
- else
+ {
+ int numBits, offset;
+ CProb *probLen = prob + LenChoice;
+ IfBit0(probLen)
+ {
+ UpdateBit0(probLen);
+ probLen = prob + LenLow + (posState << kLenNumLowBits);
+ offset = 0;
+ numBits = kLenNumLowBits;
+ }
+ else
+ {
+ UpdateBit1(probLen);
+ probLen = prob + LenChoice2;
+ IfBit0(probLen)
+ {
+ UpdateBit0(probLen);
+ probLen = prob + LenMid + (posState << kLenNumMidBits);
+ offset = kLenNumLowSymbols;
+ numBits = kLenNumMidBits;
+ }
+ else
+ {
+ UpdateBit1(probLen);
+ probLen = prob + LenHigh;
+ offset = kLenNumLowSymbols + kLenNumMidSymbols;
+ numBits = kLenNumHighBits;
+ }
+ }
+ RangeDecoderBitTreeDecode(probLen, numBits, len);
+ len += offset;
+ }
+
+ if (state < 4)
{
int posSlot;
- rep3 = rep2;
- rep2 = rep1;
- rep1 = rep0;
- state = state < 7 ? 7 : 10;
- len = LzmaLenDecode(p + LenCoder, &rd, posState);
- posSlot = RangeDecoderBitTreeDecode(p + PosSlot +
+ state += kNumLitStates;
+ prob = p + PosSlot +
((len < kNumLenToPosStates ? len : kNumLenToPosStates - 1) <<
- kNumPosSlotBits), kNumPosSlotBits, &rd);
+ kNumPosSlotBits);
+ RangeDecoderBitTreeDecode(prob, kNumPosSlotBits, posSlot);
if (posSlot >= kStartPosModelIndex)
{
int numDirectBits = ((posSlot >> 1) - 1);
- rep0 = ((2 | ((UInt32)posSlot & 1)) << numDirectBits);
+ rep0 = (2 | ((UInt32)posSlot & 1));
if (posSlot < kEndPosModelIndex)
{
- rep0 += RangeDecoderReverseBitTreeDecode(
- p + SpecPos + rep0 - posSlot - 1, numDirectBits, &rd);
+ rep0 <<= numDirectBits;
+ prob = p + SpecPos + rep0 - posSlot - 1;
}
else
{
- rep0 += RangeDecoderDecodeDirectBits(&rd,
- numDirectBits - kNumAlignBits) << kNumAlignBits;
- rep0 += RangeDecoderReverseBitTreeDecode(p + Align, kNumAlignBits, &rd);
+ numDirectBits -= kNumAlignBits;
+ do
+ {
+ RC_NORMALIZE
+ Range >>= 1;
+ rep0 <<= 1;
+ if (Code >= Range)
+ {
+ Code -= Range;
+ rep0 |= 1;
+ }
+ }
+ while (--numDirectBits != 0);
+ prob = p + Align;
+ rep0 <<= kNumAlignBits;
+ numDirectBits = kNumAlignBits;
+ }
+ {
+ int i = 1;
+ int mi = 1;
+ do
+ {
+ CProb *prob3 = prob + mi;
+ RC_GET_BIT2(prob3, mi, ; , rep0 |= i);
+ i <<= 1;
+ }
+ while(--numDirectBits != 0);
}
}
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;
+ if (++rep0 == (UInt32)(0))
+ {
+ /* it's for stream version */
+ len = kLzmaStreamWasFinishedId;
+ break;
+ }
}
+
len += kMatchMinLen;
+ #ifdef _LZMA_OUT_READ
+ if (rep0 > distanceLimit)
+ #else
+ if (rep0 > nowPos)
+ #endif
+ return LZMA_RESULT_DATA_ERROR;
+
+ #ifdef _LZMA_OUT_READ
+ if (dictionarySize - distanceLimit > (UInt32)len)
+ distanceLimit += len;
+ else
+ distanceLimit = dictionarySize;
+ #endif
+
do
{
#ifdef _LZMA_OUT_READ
#else
previousByte = outStream[nowPos - rep0];
#endif
- outStream[nowPos++] = previousByte;
len--;
+ outStream[nowPos++] = previousByte;
}
- while(len > 0 && nowPos < outSize);
+ while(len != 0 && nowPos < outSize);
}
}
+ RC_NORMALIZE;
#ifdef _LZMA_OUT_READ
- vs->RangeDecoder = rd;
+ vs->Range = Range;
+ vs->Code = Code;
vs->DictionaryPos = dictionaryPos;
- vs->GlobalPos = globalPos + nowPos;
+ vs->GlobalPos = globalPos + (UInt32)nowPos;
+ vs->DistanceLimit = distanceLimit;
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;
+ vs->TempDictionary[0] = tempDictionary[0];
#endif
+ #ifdef _LZMA_IN_CB
+ vs->Buffer = Buffer;
+ vs->BufferLim = BufferLim;
+ #else
+ *inSizeProcessed = (SizeT)(Buffer - inStream);
+ #endif
*outSizeProcessed = nowPos;
return LZMA_RESULT_OK;
}
projects / openwrt / openwrt.git / blobdiff