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Annotation of doom/m_swap.c, revision 1.1.1.3

1.1       root        1: // Emacs style mode select   -*- C++ -*- 
                      2: //-----------------------------------------------------------------------------
                      3: //
                      4: // $Id:$
                      5: //
                      6: // Copyright (C) 1993-1996 by id Software, Inc.
                      7: //
1.1.1.3 ! root        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.
1.1       root       11: //
1.1.1.3 ! root       12: // The source is distributed in the hope that it will be useful,
1.1       root       13: // but WITHOUT ANY WARRANTY; without even the implied warranty of
1.1.1.3 ! root       14: // FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
        !            15: // for more details.
1.1       root       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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