435 lines
10 KiB
C
435 lines
10 KiB
C
/*
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LzmaDecode.c
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LZMA Decoder (optimized for Speed version)
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LZMA SDK 4.40 Copyright (c) 1999-2006 Igor Pavlov (2006-05-01)
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http://www.7-zip.org/
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LZMA SDK is licensed under two licenses:
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1) GNU Lesser General Public License (GNU LGPL)
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2) Common Public License (CPL)
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It means that you can select one of these two licenses and
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follow rules of that license.
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SPECIAL EXCEPTION:
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Igor Pavlov, as the author of this Code, expressly permits you to
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statically or dynamically link your Code (or bind by name) to the
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interfaces of this file without subjecting your linked Code to the
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terms of the CPL or GNU LGPL. Any modifications or additions
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to this file, however, are subject to the LGPL or CPL terms.
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*/
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#include "lzmadecode.h"
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#include <types.h>
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#define kNumTopBits 24
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#define kTopValue ((UInt32)1 << kNumTopBits)
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#define kNumBitModelTotalBits 11
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#define kBitModelTotal (1 << kNumBitModelTotalBits)
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#define kNumMoveBits 5
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/* Use 32-bit reads whenever possible to avoid bad flash performance. Fall back
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* to byte reads for last 4 bytes since RC_TEST returns an error when BufferLim
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* is *reached* (not surpassed!), meaning we can't allow that to happen while
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* there are still bytes to decode from the algorithm's point of view. */
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#define RC_READ_BYTE \
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(look_ahead_ptr < 4 ? look_ahead.raw[look_ahead_ptr++] \
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: ((((uintptr_t) Buffer & 3) \
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|| ((SizeT) (BufferLim - Buffer) <= 4)) ? (*Buffer++) \
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: ((look_ahead.dw = *(UInt32 *)Buffer), (Buffer += 4), \
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(look_ahead_ptr = 1), look_ahead.raw[0])))
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#define RC_INIT2 Code = 0; Range = 0xFFFFFFFF; \
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{ \
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int i; \
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\
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for (i = 0; i < 5; i++) { \
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RC_TEST; \
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Code = (Code << 8) | RC_READ_BYTE; \
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} \
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}
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#define RC_TEST { if (Buffer == BufferLim) return LZMA_RESULT_DATA_ERROR; }
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#define RC_INIT(buffer, bufferSize) Buffer = buffer; \
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BufferLim = buffer + bufferSize; RC_INIT2
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#define RC_NORMALIZE \
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if (Range < kTopValue) { \
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RC_TEST; \
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Range <<= 8; \
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Code = (Code << 8) | RC_READ_BYTE; \
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}
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#define IfBit0(p) \
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RC_NORMALIZE; \
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bound = (Range >> kNumBitModelTotalBits) * *(p); \
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if (Code < bound)
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#define UpdateBit0(p) \
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Range = bound; \
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*(p) += (kBitModelTotal - *(p)) >> kNumMoveBits
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#define UpdateBit1(p) \
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Range -= bound; \
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Code -= bound; \
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*(p) -= (*(p)) >> kNumMoveBits
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#define RC_GET_BIT2(p, mi, A0, A1) \
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IfBit0(p) { \
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UpdateBit0(p); \
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mi <<= 1; \
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A0; \
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} else { \
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UpdateBit1(p); \
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mi = (mi + mi) + 1; \
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A1; \
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}
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#define RC_GET_BIT(p, mi) RC_GET_BIT2(p, mi, ;, ;)
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#define RangeDecoderBitTreeDecode(probs, numLevels, res) \
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{ \
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int i = numLevels; \
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\
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res = 1; \
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do { \
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CProb *cp = probs + res; \
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RC_GET_BIT(cp, res) \
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} while (--i != 0); \
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res -= (1 << numLevels); \
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}
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#define kNumPosBitsMax 4
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#define kNumPosStatesMax (1 << kNumPosBitsMax)
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#define kLenNumLowBits 3
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#define kLenNumLowSymbols (1 << kLenNumLowBits)
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#define kLenNumMidBits 3
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#define kLenNumMidSymbols (1 << kLenNumMidBits)
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#define kLenNumHighBits 8
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#define kLenNumHighSymbols (1 << kLenNumHighBits)
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#define LenChoice 0
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#define LenChoice2 (LenChoice + 1)
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#define LenLow (LenChoice2 + 1)
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#define LenMid (LenLow + (kNumPosStatesMax << kLenNumLowBits))
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#define LenHigh (LenMid + (kNumPosStatesMax << kLenNumMidBits))
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#define kNumLenProbs (LenHigh + kLenNumHighSymbols)
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#define kNumStates 12
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#define kNumLitStates 7
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#define kStartPosModelIndex 4
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#define kEndPosModelIndex 14
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#define kNumFullDistances (1 << (kEndPosModelIndex >> 1))
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#define kNumPosSlotBits 6
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#define kNumLenToPosStates 4
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#define kNumAlignBits 4
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#define kAlignTableSize (1 << kNumAlignBits)
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#define kMatchMinLen 2
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#define IsMatch 0
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#define IsRep (IsMatch + (kNumStates << kNumPosBitsMax))
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#define IsRepG0 (IsRep + kNumStates)
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#define IsRepG1 (IsRepG0 + kNumStates)
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#define IsRepG2 (IsRepG1 + kNumStates)
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#define IsRep0Long (IsRepG2 + kNumStates)
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#define PosSlot (IsRep0Long + (kNumStates << kNumPosBitsMax))
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#define SpecPos (PosSlot + (kNumLenToPosStates << kNumPosSlotBits))
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#define Align (SpecPos + kNumFullDistances - kEndPosModelIndex)
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#define LenCoder (Align + kAlignTableSize)
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#define RepLenCoder (LenCoder + kNumLenProbs)
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#define Literal (RepLenCoder + kNumLenProbs)
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#if Literal != LZMA_BASE_SIZE
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StopCompilingDueBUG
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#endif
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int LzmaDecodeProperties(CLzmaProperties *propsRes,
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const unsigned char *propsData, int size)
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{
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unsigned char prop0;
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if (size < LZMA_PROPERTIES_SIZE)
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return LZMA_RESULT_DATA_ERROR;
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prop0 = propsData[0];
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if (prop0 >= (9 * 5 * 5))
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return LZMA_RESULT_DATA_ERROR;
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{
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for (propsRes->pb = 0; prop0 >= (9 * 5);
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propsRes->pb++, prop0 -= (9 * 5))
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;
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for (propsRes->lp = 0; prop0 >= 9; propsRes->lp++, prop0 -= 9)
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;
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propsRes->lc = prop0;
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/*
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* unsigned char remainder = (unsigned char)(prop0 / 9);
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* propsRes->lc = prop0 % 9;
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* propsRes->pb = remainder / 5;
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* propsRes->lp = remainder % 5;
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*/
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}
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return LZMA_RESULT_OK;
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}
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#define kLzmaStreamWasFinishedId (-1)
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int LzmaDecode(CLzmaDecoderState *vs,
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const unsigned char *inStream, SizeT inSize, SizeT *inSizeProcessed,
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unsigned char *outStream, SizeT outSize, SizeT *outSizeProcessed)
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{
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CProb *p = vs->Probs;
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SizeT nowPos = 0;
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Byte previousByte = 0;
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UInt32 posStateMask = (1 << (vs->Properties.pb)) - 1;
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UInt32 literalPosMask = (1 << (vs->Properties.lp)) - 1;
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int lc = vs->Properties.lc;
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int state = 0;
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UInt32 rep0 = 1, rep1 = 1, rep2 = 1, rep3 = 1;
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int len = 0;
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const Byte *Buffer;
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const Byte *BufferLim;
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int look_ahead_ptr = 4;
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union {
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Byte raw[4];
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UInt32 dw;
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} look_ahead;
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UInt32 Range;
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UInt32 Code;
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*inSizeProcessed = 0;
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*outSizeProcessed = 0;
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{
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UInt32 i;
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UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (lc
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+ vs->Properties.lp));
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for (i = 0; i < numProbs; i++)
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p[i] = kBitModelTotal >> 1;
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}
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RC_INIT(inStream, inSize);
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while (nowPos < outSize) {
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CProb *prob;
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UInt32 bound;
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int posState = (int)((nowPos)&posStateMask);
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prob = p + IsMatch + (state << kNumPosBitsMax) + posState;
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IfBit0(prob) {
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int symbol = 1;
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UpdateBit0(prob);
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prob = p + Literal + (LZMA_LIT_SIZE *
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((((nowPos) & literalPosMask) << lc)
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+ (previousByte >> (8 - lc))));
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if (state >= kNumLitStates) {
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int matchByte;
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matchByte = outStream[nowPos - rep0];
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do {
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int bit;
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CProb *probLit;
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matchByte <<= 1;
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bit = (matchByte & 0x100);
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probLit = prob + 0x100 + bit + symbol;
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RC_GET_BIT2(probLit, symbol,
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if (bit != 0)
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break,
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if (bit == 0)
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break)
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} while (symbol < 0x100);
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}
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while (symbol < 0x100) {
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CProb *probLit = prob + symbol;
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RC_GET_BIT(probLit, symbol)
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}
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previousByte = (Byte)symbol;
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outStream[nowPos++] = previousByte;
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if (state < 4)
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state = 0;
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else if (state < 10)
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state -= 3;
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else
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state -= 6;
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} else {
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UpdateBit1(prob);
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prob = p + IsRep + state;
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IfBit0(prob) {
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UpdateBit0(prob);
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rep3 = rep2;
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rep2 = rep1;
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rep1 = rep0;
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state = state < kNumLitStates ? 0 : 3;
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prob = p + LenCoder;
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} else {
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UpdateBit1(prob);
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prob = p + IsRepG0 + state;
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IfBit0(prob) {
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UpdateBit0(prob);
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prob = p + IsRep0Long
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+ (state << kNumPosBitsMax)
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+ posState;
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IfBit0(prob) {
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UpdateBit0(prob);
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if (nowPos == 0)
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return LZMA_RESULT_DATA_ERROR;
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state = state < kNumLitStates
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? 9 : 11;
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previousByte = outStream[nowPos
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- rep0];
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outStream[nowPos++] =
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previousByte;
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continue;
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} else {
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UpdateBit1(prob);
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}
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} else {
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UInt32 distance;
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UpdateBit1(prob);
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prob = p + IsRepG1 + state;
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IfBit0(prob) {
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UpdateBit0(prob);
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distance = rep1;
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} else {
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UpdateBit1(prob);
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prob = p + IsRepG2 + state;
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IfBit0(prob) {
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UpdateBit0(prob);
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distance = rep2;
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} else {
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UpdateBit1(prob);
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distance = rep3;
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rep3 = rep2;
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}
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rep2 = rep1;
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}
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rep1 = rep0;
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rep0 = distance;
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}
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state = state < kNumLitStates ? 8 : 11;
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prob = p + RepLenCoder;
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}
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{
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int numBits, offset;
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CProb *probLen = prob + LenChoice;
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IfBit0(probLen) {
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UpdateBit0(probLen);
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probLen = prob + LenLow
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+ (posState << kLenNumLowBits);
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offset = 0;
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numBits = kLenNumLowBits;
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} else {
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UpdateBit1(probLen);
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probLen = prob + LenChoice2;
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IfBit0(probLen) {
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UpdateBit0(probLen);
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probLen = prob + LenMid
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+ (posState <<
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kLenNumMidBits);
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offset = kLenNumLowSymbols;
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numBits = kLenNumMidBits;
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} else {
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UpdateBit1(probLen);
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probLen = prob + LenHigh;
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offset = kLenNumLowSymbols
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+ kLenNumMidSymbols;
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numBits = kLenNumHighBits;
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}
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}
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RangeDecoderBitTreeDecode(probLen, numBits,
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len);
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len += offset;
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}
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if (state < 4) {
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int posSlot;
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state += kNumLitStates;
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prob = p + PosSlot +
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((len < kNumLenToPosStates ? len :
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kNumLenToPosStates - 1) <<
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kNumPosSlotBits);
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RangeDecoderBitTreeDecode(prob, kNumPosSlotBits,
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posSlot);
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if (posSlot >= kStartPosModelIndex) {
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int numDirectBits = ((posSlot >> 1)
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- 1);
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rep0 = (2 | ((UInt32)posSlot & 1));
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if (posSlot < kEndPosModelIndex) {
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rep0 <<= numDirectBits;
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prob = p + SpecPos + rep0
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- posSlot - 1;
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} else {
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numDirectBits -= kNumAlignBits;
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do {
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RC_NORMALIZE
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Range >>= 1;
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rep0 <<= 1;
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if (Code >= Range) {
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Code -= Range;
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rep0 |= 1;
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}
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} while (--numDirectBits != 0);
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prob = p + Align;
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rep0 <<= kNumAlignBits;
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numDirectBits = kNumAlignBits;
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}
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{
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int i = 1;
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int mi = 1;
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do {
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CProb *prob3 = prob
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+ mi;
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RC_GET_BIT2(prob3, mi,
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;, rep0 |= i);
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i <<= 1;
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} while (--numDirectBits != 0);
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}
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} else
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rep0 = posSlot;
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if (++rep0 == (UInt32)(0)) {
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/* it's for stream version */
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len = kLzmaStreamWasFinishedId;
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break;
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}
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}
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len += kMatchMinLen;
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if (rep0 > nowPos)
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return LZMA_RESULT_DATA_ERROR;
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do {
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previousByte = outStream[nowPos - rep0];
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len--;
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outStream[nowPos++] = previousByte;
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} while (len != 0 && nowPos < outSize);
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}
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}
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RC_NORMALIZE;
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/*
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* Tell static analysis we know len can have a dead assignment.
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*/
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(void)len;
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*inSizeProcessed = (SizeT)(Buffer - inStream);
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*outSizeProcessed = nowPos;
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return LZMA_RESULT_OK;
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}
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