1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
#include "LenCoder.h"
#ifndef __LZMA_H
#define __LZMA_H
namespace NCompress {
namespace NLZMA {
const UINT32 kNumRepDistances = 4;
const BYTE kNumStates = 12;
const BYTE kLiteralNextStates[kNumStates] = {0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 4, 5};
const BYTE kMatchNextStates[kNumStates] = {7, 7, 7, 7, 7, 7, 7, 10, 10, 10, 10, 10};
const BYTE kRepNextStates[kNumStates] = {8, 8, 8, 8, 8, 8, 8, 11, 11, 11, 11, 11};
const BYTE kShortRepNextStates[kNumStates]= {9, 9, 9, 9, 9, 9, 9, 11, 11, 11, 11, 11};
class CState
{
public:
BYTE m_Index;
void Init()
{ m_Index = 0; }
void UpdateChar()
{ m_Index = kLiteralNextStates[m_Index]; }
void UpdateMatch()
{ m_Index = kMatchNextStates[m_Index]; }
void UpdateRep()
{ m_Index = kRepNextStates[m_Index]; }
void UpdateShortRep()
{ m_Index = kShortRepNextStates[m_Index]; }
};
class CBaseCoder
{
protected:
CState m_State;
BYTE m_PreviousByte;
bool m_PeviousIsMatch;
UINT32 m_RepDistances[kNumRepDistances];
void Init()
{
m_State.Init();
m_PreviousByte = 0;
m_PeviousIsMatch = false;
for(int i = 0 ; i < kNumRepDistances; i++)
m_RepDistances[i] = 0;
}
};
const int kNumPosSlotBits = 6;
const int kDicLogSizeMax = 28;
const int kDistTableSizeMax = kDicLogSizeMax * 2;
extern UINT32 kDistStart[kDistTableSizeMax];
const BYTE kDistDirectBits[kDistTableSizeMax] =
{
0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9,
10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 16, 17, 17, 18, 18, 19, 19,
20, 20, 21, 21, 22, 22, 23, 23, 24, 24, 25, 25, 26, 26
};
const UINT32 kNumLenToPosStates = 4;
inline UINT32 GetLenToPosState(UINT32 aLen)
{
aLen -= 2;
if (aLen < kNumLenToPosStates)
return aLen;
return kNumLenToPosStates - 1;
}
const int kMatchMinLen = 2;
const int kMatchMaxLen = kMatchMinLen + NLength::kNumSymbolsTotal - 1;
const int kNumAlignBits = 4;
const int kAlignTableSize = 1 << kNumAlignBits;
const UINT32 kAlignMask = (kAlignTableSize - 1);
const int kStartPosModelIndex = 4;
const int kEndPosModelIndex = 14;
const int kNumPosModels = kEndPosModelIndex - kStartPosModelIndex;
const int kNumFullDistances = 1 << (kEndPosModelIndex / 2);
const int kMainChoiceLiteralIndex = 0;
const int kMainChoiceMatchIndex = 1;
const int kMatchChoiceDistanceIndex= 0;
const int kMatchChoiceRepetitionIndex = 1;
const int kNumMoveBitsForMainChoice = 5;
const int kNumMoveBitsForPosCoders = 5;
const int kNumMoveBitsForAlignCoders = 5;
const int kNumMoveBitsForPosSlotCoder = 5;
const int kNumLitPosStatesBitsEncodingMax = 4;
const int kNumLitContextBitsMax = 8;
}}
#endif
|
