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