663 lines
17 KiB
C
663 lines
17 KiB
C
/*
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LzmaDecode.c
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LZMA Decoder
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LZMA SDK 4.05 Copyright (c) 1999-2004 Igor Pavlov (2004-08-25)
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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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#ifndef Byte
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#define Byte unsigned char
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#endif
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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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typedef struct _CRangeDecoder
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{
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Byte *Buffer;
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Byte *BufferLim;
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UInt32 Range;
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UInt32 Code;
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#ifdef _LZMA_IN_CB
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ILzmaInCallback *InCallback;
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int Result;
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#endif
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int ExtraBytes;
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} CRangeDecoder;
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Byte RangeDecoderReadByte(CRangeDecoder *rd)
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{
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if (rd->Buffer == rd->BufferLim)
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{
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#ifdef _LZMA_IN_CB
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UInt32 size;
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rd->Result = rd->InCallback->Read(rd->InCallback, &rd->Buffer, &size);
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rd->BufferLim = rd->Buffer + size;
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if (size == 0)
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#endif
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{
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rd->ExtraBytes = 1;
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return 0xFF;
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}
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}
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return (*rd->Buffer++);
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}
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/* #define ReadByte (*rd->Buffer++) */
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#define ReadByte (RangeDecoderReadByte(rd))
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void RangeDecoderInit(CRangeDecoder *rd,
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#ifdef _LZMA_IN_CB
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ILzmaInCallback *inCallback
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#else
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Byte *stream, UInt32 bufferSize
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#endif
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)
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{
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int i;
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#ifdef _LZMA_IN_CB
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rd->InCallback = inCallback;
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rd->Buffer = rd->BufferLim = 0;
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#else
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rd->Buffer = stream;
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rd->BufferLim = stream + bufferSize;
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#endif
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rd->ExtraBytes = 0;
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rd->Code = 0;
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rd->Range = (0xFFFFFFFF);
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for(i = 0; i < 5; i++)
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rd->Code = (rd->Code << 8) | ReadByte;
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}
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#define RC_INIT_VAR UInt32 range = rd->Range; UInt32 code = rd->Code;
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#define RC_FLUSH_VAR rd->Range = range; rd->Code = code;
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#define RC_NORMALIZE if (range < kTopValue) { range <<= 8; code = (code << 8) | ReadByte; }
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UInt32 RangeDecoderDecodeDirectBits(CRangeDecoder *rd, int numTotalBits)
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{
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RC_INIT_VAR
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UInt32 result = 0;
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int i;
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for (i = numTotalBits; i > 0; i--)
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{
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/* UInt32 t; */
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range >>= 1;
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result <<= 1;
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if (code >= range)
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{
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code -= range;
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result |= 1;
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}
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/*
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t = (code - range) >> 31;
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t &= 1;
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code -= range & (t - 1);
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result = (result + result) | (1 - t);
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*/
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RC_NORMALIZE
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}
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RC_FLUSH_VAR
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return result;
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}
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int RangeDecoderBitDecode(CProb *prob, CRangeDecoder *rd)
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{
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UInt32 bound = (rd->Range >> kNumBitModelTotalBits) * *prob;
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if (rd->Code < bound)
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{
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rd->Range = bound;
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*prob += (kBitModelTotal - *prob) >> kNumMoveBits;
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if (rd->Range < kTopValue)
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{
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rd->Code = (rd->Code << 8) | ReadByte;
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rd->Range <<= 8;
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}
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return 0;
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}
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else
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{
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rd->Range -= bound;
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rd->Code -= bound;
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*prob -= (*prob) >> kNumMoveBits;
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if (rd->Range < kTopValue)
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{
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rd->Code = (rd->Code << 8) | ReadByte;
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rd->Range <<= 8;
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}
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return 1;
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}
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}
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#define RC_GET_BIT2(prob, mi, A0, A1) \
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UInt32 bound = (range >> kNumBitModelTotalBits) * *prob; \
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if (code < bound) \
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{ A0; range = bound; *prob += (kBitModelTotal - *prob) >> kNumMoveBits; mi <<= 1; } \
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else \
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{ A1; range -= bound; code -= bound; *prob -= (*prob) >> kNumMoveBits; mi = (mi + mi) + 1; } \
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RC_NORMALIZE
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#define RC_GET_BIT(prob, mi) RC_GET_BIT2(prob, mi, ; , ;)
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int RangeDecoderBitTreeDecode(CProb *probs, int numLevels, CRangeDecoder *rd)
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{
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int mi = 1;
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int i;
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#ifdef _LZMA_LOC_OPT
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RC_INIT_VAR
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#endif
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for(i = numLevels; i > 0; i--)
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{
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#ifdef _LZMA_LOC_OPT
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CProb *prob = probs + mi;
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RC_GET_BIT(prob, mi)
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#else
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mi = (mi + mi) + RangeDecoderBitDecode(probs + mi, rd);
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#endif
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}
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#ifdef _LZMA_LOC_OPT
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RC_FLUSH_VAR
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#endif
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return mi - (1 << numLevels);
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}
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int RangeDecoderReverseBitTreeDecode(CProb *probs, int numLevels, CRangeDecoder *rd)
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{
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int mi = 1;
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int i;
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int symbol = 0;
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#ifdef _LZMA_LOC_OPT
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RC_INIT_VAR
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#endif
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for(i = 0; i < numLevels; i++)
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{
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#ifdef _LZMA_LOC_OPT
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CProb *prob = probs + mi;
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RC_GET_BIT2(prob, mi, ; , symbol |= (1 << i))
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#else
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int bit = RangeDecoderBitDecode(probs + mi, rd);
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mi = mi + mi + bit;
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symbol |= (bit << i);
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#endif
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}
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#ifdef _LZMA_LOC_OPT
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RC_FLUSH_VAR
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#endif
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return symbol;
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}
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Byte LzmaLiteralDecode(CProb *probs, CRangeDecoder *rd)
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{
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int symbol = 1;
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#ifdef _LZMA_LOC_OPT
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RC_INIT_VAR
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#endif
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do
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{
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#ifdef _LZMA_LOC_OPT
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CProb *prob = probs + symbol;
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RC_GET_BIT(prob, symbol)
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#else
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symbol = (symbol + symbol) | RangeDecoderBitDecode(probs + symbol, rd);
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#endif
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}
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while (symbol < 0x100);
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#ifdef _LZMA_LOC_OPT
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RC_FLUSH_VAR
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#endif
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return symbol;
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}
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Byte LzmaLiteralDecodeMatch(CProb *probs, CRangeDecoder *rd, Byte matchByte)
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{
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int symbol = 1;
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#ifdef _LZMA_LOC_OPT
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RC_INIT_VAR
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#endif
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do
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{
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int bit;
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int matchBit = (matchByte >> 7) & 1;
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matchByte <<= 1;
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#ifdef _LZMA_LOC_OPT
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{
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CProb *prob = probs + ((1 + matchBit) << 8) + symbol;
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RC_GET_BIT2(prob, symbol, bit = 0, bit = 1)
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}
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#else
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bit = RangeDecoderBitDecode(probs + ((1 + matchBit) << 8) + symbol, rd);
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symbol = (symbol << 1) | bit;
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#endif
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if (matchBit != bit)
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{
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while (symbol < 0x100)
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{
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#ifdef _LZMA_LOC_OPT
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CProb *prob = probs + symbol;
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RC_GET_BIT(prob, symbol)
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#else
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symbol = (symbol + symbol) | RangeDecoderBitDecode(probs + symbol, rd);
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#endif
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}
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break;
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}
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}
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while (symbol < 0x100);
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#ifdef _LZMA_LOC_OPT
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RC_FLUSH_VAR
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#endif
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return symbol;
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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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int LzmaLenDecode(CProb *p, CRangeDecoder *rd, int posState)
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{
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if(RangeDecoderBitDecode(p + LenChoice, rd) == 0)
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return RangeDecoderBitTreeDecode(p + LenLow +
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(posState << kLenNumLowBits), kLenNumLowBits, rd);
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if(RangeDecoderBitDecode(p + LenChoice2, rd) == 0)
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return kLenNumLowSymbols + RangeDecoderBitTreeDecode(p + LenMid +
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(posState << kLenNumMidBits), kLenNumMidBits, rd);
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return kLenNumLowSymbols + kLenNumMidSymbols +
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RangeDecoderBitTreeDecode(p + LenHigh, kLenNumHighBits, rd);
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}
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#define kNumStates 12
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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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#ifdef _LZMA_OUT_READ
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typedef struct _LzmaVarState
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{
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CRangeDecoder RangeDecoder;
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Byte *Dictionary;
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UInt32 DictionarySize;
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UInt32 DictionaryPos;
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UInt32 GlobalPos;
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UInt32 Reps[4];
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int lc;
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int lp;
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int pb;
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int State;
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int PreviousIsMatch;
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int RemainLen;
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} LzmaVarState;
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int LzmaDecoderInit(
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unsigned char *buffer, UInt32 bufferSize,
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int lc, int lp, int pb,
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unsigned char *dictionary, UInt32 dictionarySize,
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#ifdef _LZMA_IN_CB
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ILzmaInCallback *inCallback
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#else
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unsigned char *inStream, UInt32 inSize
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#endif
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)
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{
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LzmaVarState *vs = (LzmaVarState *)buffer;
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CProb *p = (CProb *)(buffer + sizeof(LzmaVarState));
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UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (lc + lp));
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UInt32 i;
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if (bufferSize < numProbs * sizeof(CProb) + sizeof(LzmaVarState))
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return LZMA_RESULT_NOT_ENOUGH_MEM;
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vs->Dictionary = dictionary;
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vs->DictionarySize = dictionarySize;
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vs->DictionaryPos = 0;
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vs->GlobalPos = 0;
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vs->Reps[0] = vs->Reps[1] = vs->Reps[2] = vs->Reps[3] = 1;
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vs->lc = lc;
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vs->lp = lp;
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vs->pb = pb;
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vs->State = 0;
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vs->PreviousIsMatch = 0;
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vs->RemainLen = 0;
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dictionary[dictionarySize - 1] = 0;
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for (i = 0; i < numProbs; i++)
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p[i] = kBitModelTotal >> 1;
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RangeDecoderInit(&vs->RangeDecoder,
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#ifdef _LZMA_IN_CB
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inCallback
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#else
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inStream, inSize
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#endif
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);
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return LZMA_RESULT_OK;
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}
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int LzmaDecode(unsigned char *buffer,
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unsigned char *outStream, UInt32 outSize,
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UInt32 *outSizeProcessed)
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{
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LzmaVarState *vs = (LzmaVarState *)buffer;
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CProb *p = (CProb *)(buffer + sizeof(LzmaVarState));
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CRangeDecoder rd = vs->RangeDecoder;
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int state = vs->State;
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int previousIsMatch = vs->PreviousIsMatch;
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Byte previousByte;
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UInt32 rep0 = vs->Reps[0], rep1 = vs->Reps[1], rep2 = vs->Reps[2], rep3 = vs->Reps[3];
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UInt32 nowPos = 0;
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UInt32 posStateMask = (1 << (vs->pb)) - 1;
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UInt32 literalPosMask = (1 << (vs->lp)) - 1;
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int lc = vs->lc;
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int len = vs->RemainLen;
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UInt32 globalPos = vs->GlobalPos;
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Byte *dictionary = vs->Dictionary;
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UInt32 dictionarySize = vs->DictionarySize;
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UInt32 dictionaryPos = vs->DictionaryPos;
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if (len == -1)
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{
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*outSizeProcessed = 0;
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return LZMA_RESULT_OK;
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}
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while(len > 0 && nowPos < outSize)
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{
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UInt32 pos = dictionaryPos - rep0;
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if (pos >= dictionarySize)
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pos += dictionarySize;
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outStream[nowPos++] = dictionary[dictionaryPos] = dictionary[pos];
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if (++dictionaryPos == dictionarySize)
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dictionaryPos = 0;
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len--;
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}
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if (dictionaryPos == 0)
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previousByte = dictionary[dictionarySize - 1];
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else
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previousByte = dictionary[dictionaryPos - 1];
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#else
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int LzmaDecode(
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Byte *buffer, UInt32 bufferSize,
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int lc, int lp, int pb,
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#ifdef _LZMA_IN_CB
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ILzmaInCallback *inCallback,
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#else
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unsigned char *inStream, UInt32 inSize,
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#endif
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unsigned char *outStream, UInt32 outSize,
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UInt32 *outSizeProcessed)
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{
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UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (lc + lp));
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CProb *p = (CProb *)buffer;
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CRangeDecoder rd;
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UInt32 i;
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int state = 0;
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int previousIsMatch = 0;
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Byte previousByte = 0;
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UInt32 rep0 = 1, rep1 = 1, rep2 = 1, rep3 = 1;
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UInt32 nowPos = 0;
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UInt32 posStateMask = (1 << pb) - 1;
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UInt32 literalPosMask = (1 << lp) - 1;
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int len = 0;
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if (bufferSize < numProbs * sizeof(CProb))
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return LZMA_RESULT_NOT_ENOUGH_MEM;
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for (i = 0; i < numProbs; i++)
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p[i] = kBitModelTotal >> 1;
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RangeDecoderInit(&rd,
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#ifdef _LZMA_IN_CB
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inCallback
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#else
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inStream, inSize
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#endif
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);
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#endif
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*outSizeProcessed = 0;
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while(nowPos < outSize)
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{
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int posState = (int)(
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(nowPos
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#ifdef _LZMA_OUT_READ
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+ globalPos
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#endif
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)
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& posStateMask);
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#ifdef _LZMA_IN_CB
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if (rd.Result != LZMA_RESULT_OK)
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return rd.Result;
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#endif
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if (rd.ExtraBytes != 0)
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return LZMA_RESULT_DATA_ERROR;
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if (RangeDecoderBitDecode(p + IsMatch + (state << kNumPosBitsMax) + posState, &rd) == 0)
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{
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CProb *probs = p + Literal + (LZMA_LIT_SIZE *
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(((
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(nowPos
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#ifdef _LZMA_OUT_READ
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+ globalPos
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#endif
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)
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& literalPosMask) << lc) + (previousByte >> (8 - lc))));
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if (state < 4) state = 0;
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else if (state < 10) state -= 3;
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else state -= 6;
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if (previousIsMatch)
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{
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Byte matchByte;
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#ifdef _LZMA_OUT_READ
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UInt32 pos = dictionaryPos - rep0;
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if (pos >= dictionarySize)
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pos += dictionarySize;
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matchByte = dictionary[pos];
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#else
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matchByte = outStream[nowPos - rep0];
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#endif
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previousByte = LzmaLiteralDecodeMatch(probs, &rd, matchByte);
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previousIsMatch = 0;
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}
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else
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previousByte = LzmaLiteralDecode(probs, &rd);
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outStream[nowPos++] = previousByte;
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#ifdef _LZMA_OUT_READ
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dictionary[dictionaryPos] = previousByte;
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if (++dictionaryPos == dictionarySize)
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dictionaryPos = 0;
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#endif
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}
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else
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{
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previousIsMatch = 1;
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if (RangeDecoderBitDecode(p + IsRep + state, &rd) == 1)
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{
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if (RangeDecoderBitDecode(p + IsRepG0 + state, &rd) == 0)
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{
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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;
|
|
}
|