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32 lines
804 B
C++
32 lines
804 B
C++
// BZip2Crc.h
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#ifndef __BZIP2_CRC_H
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#define __BZIP2_CRC_H
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#include "../../Common/MyTypes.h"
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class CBZip2Crc
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{
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UInt32 _value;
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static UInt32 Table[256];
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public:
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static void InitTable();
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CBZip2Crc(UInt32 initVal = 0xFFFFFFFF): _value(initVal) {};
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void Init(UInt32 initVal = 0xFFFFFFFF) { _value = initVal; }
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void UpdateByte(Byte b) { _value = Table[(_value >> 24) ^ b] ^ (_value << 8); }
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void UpdateByte(unsigned int b) { _value = Table[(_value >> 24) ^ b] ^ (_value << 8); }
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UInt32 GetDigest() const { return _value ^ 0xFFFFFFFF; }
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};
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class CBZip2CombinedCrc
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{
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UInt32 _value;
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public:
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CBZip2CombinedCrc(): _value(0){};
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void Init() { _value = 0; }
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void Update(UInt32 v) { _value = ((_value << 1) | (_value >> 31)) ^ v; }
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UInt32 GetDigest() const { return _value ; }
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};
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#endif
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