diff options
Diffstat (limited to 'target/linux/ar7-2.4/image/src/LzmaDecode.c')
| -rw-r--r-- | target/linux/ar7-2.4/image/src/LzmaDecode.c | 663 |
1 files changed, 0 insertions, 663 deletions
diff --git a/target/linux/ar7-2.4/image/src/LzmaDecode.c b/target/linux/ar7-2.4/image/src/LzmaDecode.c deleted file mode 100644 index 951700b..0000000 --- a/target/linux/ar7-2.4/image/src/LzmaDecode.c +++ /dev/null @@ -1,663 +0,0 @@ -/* - 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; -} |