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view src/win32/7zip/7z/CPP/7zip/Compress/ByteSwap.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 // ByteSwap.cpp



     2 



     3 #include "StdAfx.h"



     4 



     5 #include "ByteSwap.h"



     6 



     7 STDMETHODIMP CByteSwap2::Init() { return S_OK; }



     8 



     9 STDMETHODIMP_(UInt32) CByteSwap2::Filter(Byte *data, UInt32 size)



    10 {



    11   const UInt32 kStep = 2;



    12   UInt32 i;



    13   for (i = 0; i + kStep <= size; i += kStep)



    14   {



    15     Byte b = data[i];



    16     data[i] = data[i + 1];



    17     data[i + 1] = b;



    18   }



    19   return i;



    20 }



    21 



    22 STDMETHODIMP CByteSwap4::Init() { return S_OK; }



    23 



    24 STDMETHODIMP_(UInt32) CByteSwap4::Filter(Byte *data, UInt32 size)



    25 {



    26   const UInt32 kStep = 4;



    27   UInt32 i;



    28   for (i = 0; i + kStep <= size; i += kStep)



    29   {



    30     Byte b0 = data[i];



    31     Byte b1 = data[i + 1];



    32     data[i] = data[i + 3];



    33     data[i + 1] = data[i + 2];



    34     data[i + 2] = b1;



    35     data[i + 3] = b0;



    36   }



    37   return i;



    38 }