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// ByteSwap.cpp↩
↩
#include "StdAfx.h"↩
↩
#include "../../Common/MyCom.h"↩
↩
#include "../ICoder.h"↩
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#include "../Common/RegisterCodec.h"↩
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namespace NCompress {↩
namespace NByteSwap {↩
↩
class CByteSwap2:↩
public ICompressFilter,↩
public CMyUnknownImp↩
{↩
public:↩
MY_UNKNOWN_IMP1(ICompressFilter);↩
INTERFACE_ICompressFilter(;)↩
};↩
↩
class CByteSwap4:↩
public ICompressFilter,↩
public CMyUnknownImp↩
{↩
public:↩
MY_UNKNOWN_IMP1(ICompressFilter);↩
INTERFACE_ICompressFilter(;)↩
};↩
↩
STDMETHODIMP CByteSwap2::Init() { return S_OK; }↩
↩
STDMETHODIMP_(UInt32) CByteSwap2::Filter(Byte *data, UInt32 size)↩
{↩
const UInt32 kStep = 2;↩
if (size < kStep)↩
return 0;↩
size &= ~(kStep - 1);↩
↩
const Byte *end = data + (size_t)size;↩
↩
do↩
{↩
Byte b0 = data[0];↩
data[0] = data[1];↩
data[1] = b0;↩
data += kStep;↩
}↩
while (data != end);↩
↩
return size;↩
}↩
↩
STDMETHODIMP CByteSwap4::Init() { return S_OK; }↩
↩
STDMETHODIMP_(UInt32) CByteSwap4::Filter(Byte *data, UInt32 size)↩
{↩
const UInt32 kStep = 4;↩
if (size < kStep)↩
return 0;↩
size &= ~(kStep - 1);↩
↩
const Byte *end = data + (size_t)size;↩
↩
do↩
{↩
Byte b0 = data[0];↩
Byte b1 = data[1];↩
data[0] = data[3];↩
data[1] = data[2];↩
data[2] = b1;↩
data[3] = b0;↩
data += kStep;↩
}↩
while (data != end);↩
↩
return size;↩
}↩
↩
REGISTER_FILTER_CREATE(CreateFilter2, CByteSwap2())↩
REGISTER_FILTER_CREATE(CreateFilter4, CByteSwap4())↩
↩
REGISTER_CODECS_VAR↩
{↩
REGISTER_FILTER_ITEM(CreateFilter2, CreateFilter2, 0x20302, "Swap2"),↩
REGISTER_FILTER_ITEM(CreateFilter4, CreateFilter4, 0x20304, "Swap4")↩
};↩
↩
REGISTER_CODECS(ByteSwap)↩
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}}↩