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