+/*
+ LzmaDecode.c
+ LZMA Decoder
+
+ LZMA SDK 4.05 Copyright (c) 1999-2004 Igor Pavlov (2004-08-25)
+ http://www.7-zip.org/
+
+ LZMA SDK is licensed under two licenses:
+ 1) GNU Lesser General Public License (GNU LGPL)
+ 2) Common Public License (CPL)
+ It means that you can select one of these two licenses and
+ 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
+ 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 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;
+}
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