m_swap.c
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上传日期:2021-05-12
资源大小:455k
文件大小:1k
源码类别:
射击游戏
开发平台:
Visual C++
- // Emacs style mode select -*- C++ -*-
- //-----------------------------------------------------------------------------
- //
- // $Id:$
- //
- // Copyright (C) 1993-1996 by id Software, Inc.
- //
- // This source is available for distribution and/or modification
- // only under the terms of the DOOM Source Code License as
- // published by id Software. All rights reserved.
- //
- // The source is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
- // for more details.
- //
- // $Log:$
- //
- // DESCRIPTION:
- // Endianess handling, swapping 16bit and 32bit.
- //
- //-----------------------------------------------------------------------------
- static const char
- rcsid[] = "$Id: m_bbox.c,v 1.1 1997/02/03 22:45:10 b1 Exp $";
- #ifdef __GNUG__
- #pragma implementation "m_swap.h"
- #endif
- #include "m_swap.h"
- // Not needed with big endian.
- #ifndef __BIG_ENDIAN__
- // Swap 16bit, that is, MSB and LSB byte.
- unsigned short SwapSHORT(unsigned short x)
- {
- // No masking with 0xFF should be necessary.
- return (x>>8) | (x<<8);
- }
- // Swapping 32bit.
- unsigned long SwapLONG( unsigned long x)
- {
- return
- (x>>24)
- | ((x>>8) & 0xff00)
- | ((x<<8) & 0xff0000)
- | (x<<24);
- }
- #endif