--- /dev/null
+/*
+ LzmaDecode.c
+ LZMA Decoder (optimized for Speed version)
+
+ 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:
+ 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"
+
+#define kNumTopBits 24
+#define kTopValue ((UInt32)1 << kNumTopBits)
+
+#define kNumBitModelTotalBits 11
+#define kBitModelTotal (1 << kNumBitModelTotalBits)
+#define kNumMoveBits 5
+
+#define RC_READ_BYTE (*Buffer++)
+
+#define RC_INIT2 Code = 0; Range = 0xFFFFFFFF; \
+ { int i; for(i = 0; i < 5; i++) { RC_TEST; Code = (Code << 8) | RC_READ_BYTE; }}
+
+
+#define RC_TEST { if (Buffer == BufferLim) return LZMA_RESULT_DATA_ERROR; }
+
+#define RC_INIT(buffer, bufferSize) Buffer = buffer; BufferLim = buffer + bufferSize; RC_INIT2
+
+
+#define RC_NORMALIZE if (Range < kTopValue) { RC_TEST; Range <<= 8; Code = (Code << 8) | RC_READ_BYTE; }
+
+#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;
+
+#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, ; , ;)
+
+#define RangeDecoderBitTreeDecode(probs, numLevels, res) \
+ { int i = numLevels; res = 1; \
+ do { CProb *cp = probs + res; RC_GET_BIT(cp, res) } while(--i != 0); \
+ res -= (1 << numLevels); }
+
+
+#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)
+
+
+#define kNumStates 12
+#define kNumLitStates 7
+
+#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
+
+int LzmaDecodeProperties(CLzmaProperties *propsRes, const unsigned char *propsData, int size)
+{
+ 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;
+ */
+ }
+
+ return LZMA_RESULT_OK;
+}
+
+#define kLzmaStreamWasFinishedId (-1)
+
+int LzmaDecode(CLzmaDecoderState *vs,
+ const unsigned char *inStream, SizeT inSize, SizeT *inSizeProcessed,
+ unsigned char *outStream, SizeT outSize, SizeT *outSizeProcessed)
+{
+ 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 state = 0;
+ UInt32 rep0 = 1, rep1 = 1, rep2 = 1, rep3 = 1;
+ int len = 0;
+ const Byte *Buffer;
+ const Byte *BufferLim;
+ UInt32 Range;
+ UInt32 Code;
+
+ *inSizeProcessed = 0;
+ *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;
+ }
+
+ RC_INIT(inStream, inSize);
+
+
+ while(nowPos < outSize)
+ {
+ CProb *prob;
+ UInt32 bound;
+ int posState = (int)(
+ (nowPos
+ )
+ & posStateMask);
+
+ prob = p + IsMatch + (state << kNumPosBitsMax) + posState;
+ IfBit0(prob)
+ {
+ int symbol = 1;
+ UpdateBit0(prob)
+ prob = p + Literal + (LZMA_LIT_SIZE *
+ (((
+ (nowPos
+ )
+ & literalPosMask) << lc) + (previousByte >> (8 - lc))));
+
+ if (state >= kNumLitStates)
+ {
+ int matchByte;
+ matchByte = outStream[nowPos - rep0];
+ 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);
+ }
+ while (symbol < 0x100)
+ {
+ CProb *probLit = prob + symbol;
+ RC_GET_BIT(probLit, symbol)
+ }
+ previousByte = (Byte)symbol;
+
+ outStream[nowPos++] = previousByte;
+ if (state < 4) state = 0;
+ else if (state < 10) state -= 3;
+ else state -= 6;
+ }
+ else
+ {
+ 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
+ {
+ UpdateBit1(prob);
+ prob = p + IsRepG0 + state;
+ IfBit0(prob)
+ {
+ UpdateBit0(prob);
+ prob = p + IsRep0Long + (state << kNumPosBitsMax) + posState;
+ IfBit0(prob)
+ {
+ UpdateBit0(prob);
+
+ if (nowPos == 0)
+ return LZMA_RESULT_DATA_ERROR;
+
+ state = state < kNumLitStates ? 9 : 11;
+ previousByte = outStream[nowPos - rep0];
+ outStream[nowPos++] = previousByte;
+
+ continue;
+ }
+ else
+ {
+ UpdateBit1(prob);
+ }
+ }
+ else
+ {
+ UInt32 distance;
+ UpdateBit1(prob);
+ prob = p + IsRepG1 + state;
+ IfBit0(prob)
+ {
+ UpdateBit0(prob);
+ distance = rep1;
+ }
+ else
+ {
+ UpdateBit1(prob);
+ prob = p + IsRepG2 + state;
+ IfBit0(prob)
+ {
+ UpdateBit0(prob);
+ distance = rep2;
+ }
+ else
+ {
+ UpdateBit1(prob);
+ distance = rep3;
+ rep3 = rep2;
+ }
+ rep2 = rep1;
+ }
+ rep1 = rep0;
+ rep0 = distance;
+ }
+ state = state < kNumLitStates ? 8 : 11;
+ prob = p + RepLenCoder;
+ }
+ {
+ 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;
+ state += kNumLitStates;
+ prob = p + PosSlot +
+ ((len < kNumLenToPosStates ? len : kNumLenToPosStates - 1) <<
+ kNumPosSlotBits);
+ RangeDecoderBitTreeDecode(prob, kNumPosSlotBits, posSlot);
+ if (posSlot >= kStartPosModelIndex)
+ {
+ int numDirectBits = ((posSlot >> 1) - 1);
+ rep0 = (2 | ((UInt32)posSlot & 1));
+ if (posSlot < kEndPosModelIndex)
+ {
+ rep0 <<= numDirectBits;
+ prob = p + SpecPos + rep0 - posSlot - 1;
+ }
+ else
+ {
+ 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;
+ if (++rep0 == (UInt32)(0))
+ {
+ /* it's for stream version */
+ len = kLzmaStreamWasFinishedId;
+ break;
+ }
+ }
+
+ len += kMatchMinLen;
+ if (rep0 > nowPos)
+ return LZMA_RESULT_DATA_ERROR;
+
+
+ do
+ {
+ previousByte = outStream[nowPos - rep0];
+ len--;
+ outStream[nowPos++] = previousByte;
+ }
+ while(len != 0 && nowPos < outSize);
+ }
+ }
+ RC_NORMALIZE;
+
+
+ *inSizeProcessed = (SizeT)(Buffer - inStream);
+ *outSizeProcessed = nowPos;
+ return LZMA_RESULT_OK;
+}
Code Review / kvmfornfv.git / blobdiff