misc/libphysfs/lzma/CPP/7zip/Compress/ByteSwap/ByteSwap.cpp
author nemo
Mon, 10 Apr 2017 12:06:43 -0400
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permissions -rw-r--r--
bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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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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}