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view src/win32/7zip/7z/CPP/7zip/Compress/BZip2Crc.cpp @ 1:f9f4f1b99eed

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importing src directory
author Robert McIntyre <rlm@mit.edu>
date Sat, 03 Mar 2012 10:31:27 -0600
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     1 // BZip2Crc.cpp



     2 



     3 #include "StdAfx.h"



     4 



     5 #include "BZip2Crc.h"



     6 



     7 UInt32 CBZip2Crc::Table[256];



     8 



     9 static const UInt32 kBZip2CrcPoly = 0x04c11db7;  /* AUTODIN II, Ethernet, & FDDI */



    10 



    11 void CBZip2Crc::InitTable()



    12 {



    13   for (UInt32 i = 0; i < 256; i++)



    14   {



    15     UInt32 r = (i << 24);



    16     for (int j = 8; j > 0; j--)



    17       r = (r & 0x80000000) ? ((r << 1) ^ kBZip2CrcPoly) : (r << 1);



    18     Table[i] = r;



    19   }



    20 }



    21 



    22 class CBZip2CrcTableInit



    23 {



    24 public:



    25   CBZip2CrcTableInit() { CBZip2Crc::InitTable(); }



    26 } g_BZip2CrcTableInit;