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// ByteSwap.cpp
#include "StdAfx.h"
#include "../../../C/SwapBytes.h"
#include "../../Common/MyCom.h"
#include "../ICoder.h"
#include "../Common/RegisterCodec.h"
namespace NCompress {
namespace NByteSwap {
Z7_CLASS_IMP_COM_1(CByteSwap2, ICompressFilter) };
Z7_CLASS_IMP_COM_1(CByteSwap4, ICompressFilter) };
Z7_COM7F_IMF(CByteSwap2::Init()) { return S_OK; }
Z7_COM7F_IMF2(UInt32, CByteSwap2::Filter(Byte *data, UInt32 size))
{
const UInt32 kMask = 2 - 1;
size &= ~kMask;
/*
if ((unsigned)(ptrdiff_t)data & kMask)
{
if (size == 0)
return 0;
const Byte *end = data + (size_t)size;
do
{
const Byte b0 = data[0];
data[0] = data[1];
data[1] = b0;
data += kStep;
}
while (data != end);
}
else
*/
z7_SwapBytes2((UInt16 *)(void *)data, size >> 1);
return size;
}
Z7_COM7F_IMF(CByteSwap4::Init()) { return S_OK; }
Z7_COM7F_IMF2(UInt32, CByteSwap4::Filter(Byte *data, UInt32 size))
{
const UInt32 kMask = 4 - 1;
size &= ~kMask;
/*
if ((unsigned)(ptrdiff_t)data & kMask)
{
if (size == 0)
return 0;
const Byte *end = data + (size_t)size;
do
{
const Byte b0 = data[0];
const Byte b1 = data[1];
data[0] = data[3];
data[1] = data[2];
data[2] = b1;
data[3] = b0;
data += kStep;
}
while (data != end);
}
else
*/
z7_SwapBytes4((UInt32 *)(void *)data, size >> 2);
return size;
}
static struct C_SwapBytesPrepare { C_SwapBytesPrepare() { z7_SwapBytesPrepare(); } } g_SwapBytesPrepare;
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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