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1 // Rar1Decoder.h
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2 // According to unRAR license, this code may not be used to develop
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3 // a program that creates RAR archives
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4
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5 #ifndef __COMPRESS_RAR1_DECODER_H
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6 #define __COMPRESS_RAR1_DECODER_H
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7
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8 #include "../../Common/MyCom.h"
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9
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10 #include "../ICoder.h"
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11
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12 #include "../Common/InBuffer.h"
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13
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14 #include "BitmDecoder.h"
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15 #include "HuffmanDecoder.h"
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16 #include "LzOutWindow.h"
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17
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18 namespace NCompress {
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19 namespace NRar1 {
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20
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21 const UInt32 kNumRepDists = 4;
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22
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23 typedef NBitm::CDecoder<CInBuffer> CBitDecoder;
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24
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25 class CDecoder :
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26 public ICompressCoder,
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27 public ICompressSetDecoderProperties2,
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28 public CMyUnknownImp
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29 {
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30 public:
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31 CLzOutWindow m_OutWindowStream;
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32 CBitDecoder m_InBitStream;
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33
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34 UInt32 m_RepDists[kNumRepDists];
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35 UInt32 m_RepDistPtr;
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36
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37 UInt32 LastDist;
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38 UInt32 LastLength;
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39
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40 Int64 m_UnpackSize;
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41 bool m_IsSolid;
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42
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43 UInt32 ReadBits(int numBits);
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44 HRESULT CopyBlock(UInt32 distance, UInt32 len);
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45
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46 UInt32 DecodeNum(const UInt32 *posTab);
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47 HRESULT ShortLZ();
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48 HRESULT LongLZ();
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49 HRESULT HuffDecode();
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50 void GetFlagsBuf();
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51 void InitData();
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52 void InitHuff();
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53 void CorrHuff(UInt32 *CharSet, UInt32 *NumToPlace);
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54 void OldUnpWriteBuf();
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55
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56 UInt32 ChSet[256],ChSetA[256],ChSetB[256],ChSetC[256];
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57 UInt32 Place[256],PlaceA[256],PlaceB[256],PlaceC[256];
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58 UInt32 NToPl[256],NToPlB[256],NToPlC[256];
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59 UInt32 FlagBuf,AvrPlc,AvrPlcB,AvrLn1,AvrLn2,AvrLn3;
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60 int Buf60,NumHuf,StMode,LCount,FlagsCnt;
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61 UInt32 Nhfb,Nlzb,MaxDist3;
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62
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63 void InitStructures();
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64
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65 HRESULT CodeReal(ISequentialInStream *inStream, ISequentialOutStream *outStream,
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66 const UInt64 *inSize, const UInt64 *outSize, ICompressProgressInfo *progress);
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67
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68 public:
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69 CDecoder();
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70
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71 MY_UNKNOWN_IMP1(ICompressSetDecoderProperties2)
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72
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73 void ReleaseStreams()
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74 {
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75 m_OutWindowStream.ReleaseStream();
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76 m_InBitStream.ReleaseStream();
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77 }
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78
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79 STDMETHOD(Code)(ISequentialInStream *inStream, ISequentialOutStream *outStream,
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80 const UInt64 *inSize, const UInt64 *outSize, ICompressProgressInfo *progress);
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81
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82 STDMETHOD(SetDecoderProperties2)(const Byte *data, UInt32 size);
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83
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84 };
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85
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86 }}
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87
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88 #endif
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