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Annotation of doom/m_swap.c, revision 1.1

1.1     ! root        1: // Emacs style mode select   -*- C++ -*- 
        !             2: //-----------------------------------------------------------------------------
        !             3: //
        !             4: // $Id:$
        !             5: //
        !             6: // Copyright (C) 1993-1996 by id Software, Inc.
        !             7: //
        !             8: // This source is available for distribution and/or modification
        !             9: // only under the terms of the DOOM Source Code License as
        !            10: // published by id Software. All rights reserved.
        !            11: //
        !            12: // The source is distributed in the hope that it will be useful,
        !            13: // but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            14: // FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
        !            15: // for more details.
        !            16: //
        !            17: // $Log:$
        !            18: //
        !            19: // DESCRIPTION:
        !            20: //     Endianess handling, swapping 16bit and 32bit.
        !            21: //
        !            22: //-----------------------------------------------------------------------------
        !            23: 
        !            24: static const char
        !            25: rcsid[] = "$Id: m_bbox.c,v 1.1 1997/02/03 22:45:10 b1 Exp $";
        !            26: 
        !            27: 
        !            28: #ifdef __GNUG__
        !            29: #pragma implementation "m_swap.h"
        !            30: #endif
        !            31: #include "m_swap.h"
        !            32: 
        !            33: 
        !            34: // Not needed with big endian.
        !            35: #ifndef __BIG_ENDIAN__
        !            36: 
        !            37: // Swap 16bit, that is, MSB and LSB byte.
        !            38: unsigned short SwapSHORT(unsigned short x)
        !            39: {
        !            40:     // No masking with 0xFF should be necessary. 
        !            41:     return (x>>8) | (x<<8);
        !            42: }
        !            43: 
        !            44: // Swapping 32bit.
        !            45: unsigned long SwapLONG( unsigned long x)
        !            46: {
        !            47:     return
        !            48:        (x>>24)
        !            49:        | ((x>>8) & 0xff00)
        !            50:        | ((x<<8) & 0xff0000)
        !            51:        | (x<<24);
        !            52: }
        !            53: 
        !            54: 
        !            55: #endif
        !            56: 
        !            57: 

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