misc/libphysfs/lzma/CPP/7zip/Compress/ByteSwap/ByteSwap.cpp
author unc0rr
Mon, 25 Dec 2017 00:58:47 +0100
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// 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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}