Mercurial > vba-linux

     1 // BZip2Crc.h

     2 

     3 #ifndef __BZIP2_CRC_H

     4 #define __BZIP2_CRC_H

     5 

     6 #include "Common/Types.h"

     7 

     8 class CBZip2Crc

     9 {

    10   UInt32 _value;

    11   static UInt32 Table[256];

    12 public:

    13   static void InitTable();

    14   CBZip2Crc(): _value(0xFFFFFFFF) {};

    15   void Init() { _value = 0xFFFFFFFF; }

    16   void UpdateByte(Byte b) { _value = Table[(_value >> 24) ^ b] ^ (_value << 8); }

    17   void UpdateByte(unsigned int b) { _value = Table[(_value >> 24) ^ b] ^ (_value << 8); }

    18   UInt32 GetDigest() const { return _value ^ 0xFFFFFFFF; }

    19 };

    20 

    21 class CBZip2CombinedCrc

    22 {

    23   UInt32 _value;

    24 public:

    25   CBZip2CombinedCrc():  _value(0){};

    26   void Init() { _value = 0; }

    27   void Update(UInt32 v) { _value = ((_value << 1) | (_value >> 31)) ^ v; }

    28   UInt32 GetDigest() const { return _value ; }

    29 };

    30 

    31 #endif
author	Robert McIntyre <rlm@mit.edu>
date	Sat, 03 Mar 2012 10:31:27 -0600
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