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comparison src/win32/7zip/7z/CPP/7zip/Compress/DeflateConst.h @ 1:f9f4f1b99eed

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importing src directory
author Robert McIntyre <rlm@mit.edu>
date Sat, 03 Mar 2012 10:31:27 -0600
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0:8ced16adf2e1 1:f9f4f1b99eed
1 // DeflateConst.h
2
3 #ifndef __DEFLATE_CONST_H
4 #define __DEFLATE_CONST_H
5
6 namespace NCompress {
7 namespace NDeflate {
8
9 const int kNumHuffmanBits = 15;
10
11 const UInt32 kHistorySize32 = (1 << 15);
12 const UInt32 kHistorySize64 = (1 << 16);
13
14 const UInt32 kDistTableSize32 = 30;
15 const UInt32 kDistTableSize64 = 32;
16
17 const UInt32 kNumLenSymbols32 = 256;
18 const UInt32 kNumLenSymbols64 = 255; // don't change it. It must be <= 255.
19 const UInt32 kNumLenSymbolsMax = kNumLenSymbols32;
20
21 const UInt32 kNumLenSlots = 29;
22
23 const UInt32 kFixedDistTableSize = 32;
24 const UInt32 kFixedLenTableSize = 31;
25
26 const UInt32 kSymbolEndOfBlock = 0x100;
27 const UInt32 kSymbolMatch = kSymbolEndOfBlock + 1;
28
29 const UInt32 kMainTableSize = kSymbolMatch + kNumLenSlots;
30 const UInt32 kFixedMainTableSize = kSymbolMatch + kFixedLenTableSize;
31
32 const UInt32 kLevelTableSize = 19;
33
34 const UInt32 kTableDirectLevels = 16;
35 const UInt32 kTableLevelRepNumber = kTableDirectLevels;
36 const UInt32 kTableLevel0Number = kTableLevelRepNumber + 1;
37 const UInt32 kTableLevel0Number2 = kTableLevel0Number + 1;
38
39 const UInt32 kLevelMask = 0xF;
40
41 const Byte kLenStart32[kFixedLenTableSize] =
42 {0,1,2,3,4,5,6,7,8,10,12,14,16,20,24,28,32,40,48,56,64,80,96,112,128,160,192,224, 255, 0, 0};
43 const Byte kLenStart64[kFixedLenTableSize] =
44 {0,1,2,3,4,5,6,7,8,10,12,14,16,20,24,28,32,40,48,56,64,80,96,112,128,160,192,224, 0, 0, 0};
45
46 const Byte kLenDirectBits32[kFixedLenTableSize] =
47 {0,0,0,0,0,0,0,0,1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 0, 0};
48 const Byte kLenDirectBits64[kFixedLenTableSize] =
49 {0,0,0,0,0,0,0,0,1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 16, 0, 0};
50
51 const UInt32 kDistStart[kDistTableSize64] =
52 {0,1,2,3,4,6,8,12,16,24,32,48,64,96,128,192,256,384,512,768,
53 1024,1536,2048,3072,4096,6144,8192,12288,16384,24576,32768,49152};
54 const Byte kDistDirectBits[kDistTableSize64] =
55 {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};
56
57 const Byte kLevelDirectBits[3] = {2, 3, 7};
58
59 const Byte kCodeLengthAlphabetOrder[kLevelTableSize] = {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
60
61 const UInt32 kMatchMinLen = 3;
62 const UInt32 kMatchMaxLen32 = kNumLenSymbols32 + kMatchMinLen - 1; //256 + 2
63 const UInt32 kMatchMaxLen64 = kNumLenSymbols64 + kMatchMinLen - 1; //255 + 2
64 const UInt32 kMatchMaxLen = kMatchMaxLen32;
65
66 const int kFinalBlockFieldSize = 1;
67
68 namespace NFinalBlockField
69 {
70 enum
71 {
72 kNotFinalBlock = 0,
73 kFinalBlock = 1
74 };
75 }
76
77 const int kBlockTypeFieldSize = 2;
78
79 namespace NBlockType
80 {
81 enum
82 {
83 kStored = 0,
84 kFixedHuffman = 1,
85 kDynamicHuffman = 2
86 };
87 }
88
89 const int kNumLenCodesFieldSize = 5;
90 const int kNumDistCodesFieldSize = 5;
91 const int kNumLevelCodesFieldSize = 4;
92
93 const UInt32 kNumLitLenCodesMin = 257;
94 const UInt32 kNumDistCodesMin = 1;
95 const UInt32 kNumLevelCodesMin = 4;
96
97 const int kLevelFieldSize = 3;
98
99 const int kStoredBlockLengthFieldSize = 16;
100
101 struct CLevels
102 {
103 Byte litLenLevels[kFixedMainTableSize];
104 Byte distLevels[kFixedDistTableSize];
105
106 void SubClear()
107 {
108 UInt32 i;
109 for(i = kNumLitLenCodesMin; i < kFixedMainTableSize; i++)
110 litLenLevels[i] = 0;
111 for(i = 0; i < kFixedDistTableSize; i++)
112 distLevels[i] = 0;
113 }
114
115 void SetFixedLevels()
116 {
117 int i;
118
119 for (i = 0; i < 144; i++)
120 litLenLevels[i] = 8;
121 for (; i < 256; i++)
122 litLenLevels[i] = 9;
123 for (; i < 280; i++)
124 litLenLevels[i] = 7;
125 for (; i < 288; i++)
126 litLenLevels[i] = 8;
127 for (i = 0; i < kFixedDistTableSize; i++) // test it: InfoZip only uses kDistTableSize
128 distLevels[i] = 5;
129 }
130 };
131
132 }}
133
134 #endif