rar20const.h

著名的7zip的压缩算法,压缩比最高,但是压缩时间也比较长!

// Rar20CoderConst.h
// According to unRAR license,
// this code may not be used to develop a 
// RAR (WinRAR) compatible archiver

#ifndef __RAR20_CONST_H
#define __RAR20_CONST_H

#include "Rar20ExtConst.h"

namespace NCompress {
namespace NRar20 {

const UInt32 kMainTableSize = 298;
const UInt32 kLenTableSize = 28;

const UInt32 kDistTableStart = kMainTableSize;
const UInt32 kLenTableStart = kDistTableStart + kDistTableSize;

const UInt32 kHeapTablesSizesSum = kMainTableSize + kDistTableSize + kLenTableSize;

const UInt32 kLevelTableSize = 19;

const UInt32 kMMTablesSizesSum = kMMTableSize * 4;

const UInt32 kMaxTableSize = kMMTablesSizesSum;

const UInt32 kTableDirectLevels = 16;
const UInt32 kTableLevelRepNumber = kTableDirectLevels;
const UInt32 kTableLevel0Number = kTableLevelRepNumber + 1;
const UInt32 kTableLevel0Number2 = kTableLevel0Number + 1;

const UInt32 kLevelMask = 0xF;


const UInt32 kRepBothNumber = 256;
const UInt32 kRepNumber = kRepBothNumber + 1;
const UInt32 kLen2Number = kRepNumber + 4;

const UInt32 kLen2NumNumbers = 8;
const UInt32 kReadTableNumber = kLen2Number + kLen2NumNumbers;
const UInt32 kMatchNumber = kReadTableNumber + 1;

const Byte kLenStart[kLenTableSize]      = {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};
const Byte kLenDirectBits[kLenTableSize] = {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};

const UInt32 kDistStart[kDistTableSize]     = {0,1,2,3,4,6,8,12,16,24,32,48,64,96,128,192,256,384,512,768,1024,1536,2048,3072,4096,6144,8192,12288,16384,24576,32768U,49152U,65536,98304,131072,196608,262144,327680,393216,458752,524288,589824,655360,720896,786432,851968,917504,983040};
const Byte kDistDirectBits[kDistTableSize] = {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,    16,    16,    16,    16,    16,    16,    16,    16,    16,    16,    16,    16};

const Byte kLevelDirectBits[kLevelTableSize] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 3, 7};

const Byte kLen2DistStarts[kLen2NumNumbers]={0,4,8,16,32,64,128,192};
const Byte kLen2DistDirectBits[kLen2NumNumbers]={2,2,3, 4, 5, 6,  6,  6};

const UInt32 kDistLimit2 = 0x101 - 1;
const UInt32 kDistLimit3 = 0x2000 - 1;
const UInt32 kDistLimit4 = 0x40000 - 1;

const UInt32 kMatchMaxLen = 255 + 2; 
const UInt32 kMatchMaxLenMax = 255 + 5; 
const UInt32 kNormalMatchMinLen = 3; 

}}

#endif