// 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) }}