mirror of
https://github.com/Xevion/easy7zip.git
synced 2025-12-07 13:15:04 -06:00
32 lines
812 B
C++
Executable File
32 lines
812 B
C++
Executable File
// BZip2Crc.h
|
|
|
|
#ifndef ZIP7_INC_BZIP2_CRC_H
|
|
#define ZIP7_INC_BZIP2_CRC_H
|
|
|
|
#include "../../Common/MyTypes.h"
|
|
|
|
class CBZip2Crc
|
|
{
|
|
UInt32 _value;
|
|
static UInt32 Table[256];
|
|
public:
|
|
static void InitTable();
|
|
CBZip2Crc(UInt32 initVal = 0xFFFFFFFF): _value(initVal) {}
|
|
void Init(UInt32 initVal = 0xFFFFFFFF) { _value = initVal; }
|
|
void UpdateByte(Byte b) { _value = Table[(_value >> 24) ^ b] ^ (_value << 8); }
|
|
void UpdateByte(unsigned b) { _value = Table[(_value >> 24) ^ b] ^ (_value << 8); }
|
|
UInt32 GetDigest() const { return _value ^ 0xFFFFFFFF; }
|
|
};
|
|
|
|
class CBZip2CombinedCrc
|
|
{
|
|
UInt32 _value;
|
|
public:
|
|
CBZip2CombinedCrc(): _value(0) {}
|
|
void Init() { _value = 0; }
|
|
void Update(UInt32 v) { _value = ((_value << 1) | (_value >> 31)) ^ v; }
|
|
UInt32 GetDigest() const { return _value ; }
|
|
};
|
|
|
|
#endif
|