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127 lines
2.7 KiB
C++
127 lines
2.7 KiB
C++
// Emacs style mode select -*- C++ -*-
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//-----------------------------------------------------------------------------
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//
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// $Id:$
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//
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// Copyright (C) 1993-1996 by id Software, Inc.
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//
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// This source is available for distribution and/or modification
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// only under the terms of the DOOM Source Code License as
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// published by id Software. All rights reserved.
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//
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// The source is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
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// for more details.
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//
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// DESCRIPTION:
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// Endianess handling, swapping 16bit and 32bit.
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//
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//-----------------------------------------------------------------------------
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#ifndef __M_SWAP_H__
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#define __M_SWAP_H__
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#include <stdlib.h>
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// Endianess handling.
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// WAD files are stored little endian.
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#ifdef WORDS_BIGENDIAN
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// Swap 16bit, that is, MSB and LSB byte.
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// No masking with 0xFF should be necessary.
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inline short LittleShort (short x)
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{
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return (short)((((unsigned short)x)>>8) | (((unsigned short)x)<<8));
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}
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inline unsigned short LittleShort (unsigned short x)
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{
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return (unsigned short)((x>>8) | (x<<8));
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}
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// Swapping 32bit.
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inline unsigned int LittleLong (unsigned int x)
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{
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return (unsigned int)(
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(x>>24)
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| ((x>>8) & 0xff00)
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| ((x<<8) & 0xff0000)
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| (x<<24));
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}
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inline int LittleLong (int x)
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{
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return (int)(
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(((unsigned int)x)>>24)
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| ((((unsigned int)x)>>8) & 0xff00)
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| ((((unsigned int)x)<<8) & 0xff0000)
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| (((unsigned int)x)<<24));
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}
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#define BigShort(x) (x)
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#define BigLong(x) (x)
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#else
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#define LittleShort(x) (x)
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#define LittleLong(x) (x)
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#if defined(_MSC_VER)
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inline short BigShort (short x)
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{
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return (short)_byteswap_ushort((unsigned short)x);
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}
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inline unsigned short BigShort (unsigned short x)
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{
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return _byteswap_ushort(x);
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}
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inline int BigLong (int x)
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{
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return (int)_byteswap_ulong((unsigned long)x);
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}
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inline unsigned int BigLong (unsigned int x)
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{
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return (unsigned int)_byteswap_ulong((unsigned long)x);
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}
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#pragma warning (default: 4035)
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#else
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inline short BigShort (short x)
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{
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return (short)((((unsigned short)x)>>8) | (((unsigned short)x)<<8));
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}
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inline unsigned short BigShort (unsigned short x)
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{
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return (unsigned short)((x>>8) | (x<<8));
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}
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inline unsigned int BigLong (unsigned int x)
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{
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return (unsigned int)(
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(x>>24)
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| ((x>>8) & 0xff00)
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| ((x<<8) & 0xff0000)
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| (x<<24));
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}
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inline int BigLong (int x)
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{
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return (int)(
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(((unsigned int)x)>>24)
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| ((((unsigned int)x)>>8) & 0xff00)
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| ((((unsigned int)x)<<8) & 0xff0000)
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| (((unsigned int)x)<<24));
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}
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#endif // USEASM
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#endif // WORDS_BIGENDIAN
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#endif // __M_SWAP_H__
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