196 lines
4.4 KiB
C++
196 lines
4.4 KiB
C++
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//+--------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// File: byteordr.hxx
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//
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// Contents: Byte swapping functions.
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// These functions can swap all of the base types,
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// and some special cases. There is always an
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// overloaded version which accepts a pointer to the
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// data, and performs a swap in place. Where possible,
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// there is also an overload which returns the swapped
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// value without modifying the input.
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//
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//---------------------------------------------------------------
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#ifndef __BYTEORDER_HXX_
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#define __BYTEORDER_HXX_
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#include <limits.h>
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#if (defined(_M_IX86) && (_MSC_FULL_VER > 13009037)) || ((defined(_M_AMD64) || defined(_M_IA64)) && (_MSC_FULL_VER > 13009175))
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#ifdef __cplusplus
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extern "C" {
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#endif
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unsigned short __cdecl _byteswap_ushort(unsigned short);
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unsigned long __cdecl _byteswap_ulong (unsigned long);
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unsigned __int64 __cdecl _byteswap_uint64(unsigned __int64);
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#ifdef __cplusplus
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}
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#endif
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#pragma intrinsic(_byteswap_ushort)
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#pragma intrinsic(_byteswap_ulong)
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#pragma intrinsic(_byteswap_uint64)
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#endif
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//
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// BYTE Byte-Swap
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//
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// These exist so that you can call ByteSwap(OLECHAR) without
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// knowning if OLECHAR is a CHAR or a WCHAR.
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inline BYTE ByteSwap( BYTE b )
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{
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return(b);
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}
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inline VOID ByteSwap( BYTE *pb )
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{
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*pb = ByteSwap(*pb);
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}
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//
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// WORD Byte-Swap
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//
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inline WORD ByteSwap( WORD w )
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{
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#if (defined(_M_IX86) && (_MSC_FULL_VER > 13009037)) || ((defined(_M_AMD64) || defined(_M_IA64)) && (_MSC_FULL_VER > 13009175))
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return(_byteswap_ushort(w));
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#else
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return( (USHORT) ( (LOBYTE(w) << 8 )
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HIBYTE(w)) );
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#endif
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}
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inline VOID ByteSwap( WORD *pw )
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{
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*pw = ByteSwap(*pw);
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}
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//
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// DWORD Byte-Swap
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//
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#define BYTE_MASK_A_C_ 0xff00ff00
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#define BYTE_MASK__B_D 0x00ff00ff
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#define BYTE_MASK_AB__ 0xffff0000
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#define BYTE_MASK___CD 0x0000ffff
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inline DWORD ByteSwap( DWORD dwOriginal )
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{
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#if (defined(_M_IX86) && (_MSC_FULL_VER > 13009037)) || ((defined(_M_AMD64) || defined(_M_IA64)) && (_MSC_FULL_VER > 13009175))
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return(_byteswap_ulong(dwOriginal));
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#else
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ULONG dwSwapped;
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// ABCD => BADC
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dwSwapped = (( (dwOriginal) & BYTE_MASK_A_C_ ) >> 8 )
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(( (dwOriginal) & BYTE_MASK__B_D ) << 8 );
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// BADC => DCBA
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dwSwapped = (( dwSwapped & BYTE_MASK_AB__ ) >> 16 )
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(( dwSwapped & BYTE_MASK___CD ) << 16 );
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return( dwSwapped );
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#endif
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}
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inline VOID ByteSwap( DWORD *pdw )
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{
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*pdw = ByteSwap(*pdw);
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}
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//
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// LONGLONG Byte-Swap
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//
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#define BYTE_MASK_A_C_E_G_ 0xff00ff00ff00ff00
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#define BYTE_MASK__B_D_F_H 0x00ff00ff00ff00ff
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#define BYTE_MASK_AB__EF__ 0xffff0000ffff0000
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#define BYTE_MASK___CD__GH 0x0000ffff0000ffff
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#define BYTE_MASK_ABCD____ 0xffffffff00000000
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#define BYTE_MASK_____EFGH 0x00000000ffffffff
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inline LONGLONG ByteSwap( LONGLONG llOriginal )
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{
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#ifdef _MAC
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LONGLONG llSwapped;
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*((DWORD*) &llSwapped) = *((DWORD*) &llOriginal + 1);
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*((DWORD*) &llSwapped + 1) = *((DWORD*) &llOriginal);
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ByteSwap( (DWORD*) &llSwapped );
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ByteSwap( (DWORD*) &llSwapped + 1 );
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return( llSwapped );
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#else
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#if (defined(_M_IX86) && (_MSC_FULL_VER > 13009037)) || ((defined(_M_AMD64) || defined(_M_IA64)) && (_MSC_FULL_VER > 13009175))
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return(_byteswap_uint64(llOriginal));
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#else
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LONGLONG llSwapped;
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// ABCDEFGH => BADCFEHG
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llSwapped = (( (llOriginal) & BYTE_MASK_A_C_E_G_ ) >> 8 )
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(( (llOriginal) & BYTE_MASK__B_D_F_H ) << 8 );
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// BADCFEHG => DCBAHGFE
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llSwapped = (( llSwapped & BYTE_MASK_AB__EF__ ) >> 16 )
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(( llSwapped & BYTE_MASK___CD__GH ) << 16 );
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// DCBAHGFE => HGFEDCBA
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llSwapped = (( llSwapped & BYTE_MASK_ABCD____ ) >> 32 )
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(( llSwapped & BYTE_MASK_____EFGH ) << 32 );
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return( llSwapped );
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#endif
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#endif
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}
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inline VOID ByteSwap( LONGLONG *pll )
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{
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*pll = ByteSwap( *pll );
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}
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//
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// GUID Byte-swap
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//
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inline VOID ByteSwap( GUID *pguid)
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{
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ByteSwap(&pguid->Data1);
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ByteSwap(&pguid->Data2);
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ByteSwap(&pguid->Data3);
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}
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//
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// FILETIME Byte-Swap
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//
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inline VOID ByteSwap(FILETIME *pfileTime)
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{
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ByteSwap(&pfileTime->dwLowDateTime);
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ByteSwap(&pfileTime->dwHighDateTime);
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}
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#endif // !__BYTEORDER_HXX_
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