1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/win32/7zip/7z/CPP/7zip/Compress/ByteSwap.cpp	Sat Mar 03 10:31:27 2012 -0600
     1.3 @@ -0,0 +1,38 @@
     1.4 +// ByteSwap.cpp
     1.5 +
     1.6 +#include "StdAfx.h"
     1.7 +
     1.8 +#include "ByteSwap.h"
     1.9 +
    1.10 +STDMETHODIMP CByteSwap2::Init() { return S_OK; }
    1.11 +
    1.12 +STDMETHODIMP_(UInt32) CByteSwap2::Filter(Byte *data, UInt32 size)
    1.13 +{
    1.14 +  const UInt32 kStep = 2;
    1.15 +  UInt32 i;
    1.16 +  for (i = 0; i + kStep <= size; i += kStep)
    1.17 +  {
    1.18 +    Byte b = data[i];
    1.19 +    data[i] = data[i + 1];
    1.20 +    data[i + 1] = b;
    1.21 +  }
    1.22 +  return i;
    1.23 +}
    1.24 +
    1.25 +STDMETHODIMP CByteSwap4::Init() { return S_OK; }
    1.26 +
    1.27 +STDMETHODIMP_(UInt32) CByteSwap4::Filter(Byte *data, UInt32 size)
    1.28 +{
    1.29 +  const UInt32 kStep = 4;
    1.30 +  UInt32 i;
    1.31 +  for (i = 0; i + kStep <= size; i += kStep)
    1.32 +  {
    1.33 +    Byte b0 = data[i];
    1.34 +    Byte b1 = data[i + 1];
    1.35 +    data[i] = data[i + 3];
    1.36 +    data[i + 1] = data[i + 2];
    1.37 +    data[i + 2] = b1;
    1.38 +    data[i + 3] = b0;
    1.39 +  }
    1.40 +  return i;
    1.41 +}