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// ByteSwap.cpp
#include "StdAfx.h"
#include "ByteSwap.h"
STDMETHODIMP CByteSwap2::Init() { return S_OK; }
STDMETHODIMP_(UInt32) CByteSwap2::Filter(Byte *data, UInt32 size)
{
const UInt32 kStep = 2;
UInt32 i;
for (i = 0; i + kStep <= size; i += kStep)
{
Byte b = data[i];
data[i] = data[i + 1];
data[i + 1] = b;
}
return i;
}
STDMETHODIMP CByteSwap4::Init() { return S_OK; }
STDMETHODIMP_(UInt32) CByteSwap4::Filter(Byte *data, UInt32 size)
{
const UInt32 kStep = 4;
UInt32 i;
for (i = 0; i + kStep <= size; i += kStep)
{
Byte b0 = data[i];
Byte b1 = data[i + 1];
data[i] = data[i + 3];
data[i + 1] = data[i + 2];
data[i + 2] = b1;
data[i + 3] = b0;
}
return i;
}
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