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root/freemol/trunk/src/mpeg_encode/src/byteorder.h
Revision: 22
Committed: Mon Jul 7 22:16:37 2008 UTC (11 years, 1 month ago) by wdelano
File size: 2647 byte(s)
Log Message:
initial checkin of mpeg_encode source
Line User Rev File contents
1 wdelano 22 /*===========================================================================*
2     * byteorder.h *
3     * *
4     * stuff to handle different byte order *
5     * *
6     *===========================================================================*/
7    
8     /*
9     * Copyright (c) 1995 The Regents of the University of California.
10     * All rights reserved.
11     *
12     * Permission to use, copy, modify, and distribute this software and its
13     * documentation for any purpose, without fee, and without written agreement is
14     * hereby granted, provided that the above copyright notice and the following
15     * two paragraphs appear in all copies of this software.
16     *
17     * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
18     * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
19     * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
20     * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
21     *
22     * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
23     * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
24     * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
25     * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
26     * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
27     */
28    
29     /*
30     * $Header: /u/smoot/md/mpeg_encode/headers/RCS/byteorder.h,v 1.3 1995/01/19 23:54:39 eyhung Exp $
31     * $Log: byteorder.h,v $
32     * Revision 1.3 1995/01/19 23:54:39 eyhung
33     * Changed copyrights
34     *
35     * Revision 1.3 1995/01/19 23:54:39 eyhung
36     * Changed copyrights
37     *
38     * Revision 1.2 1994/11/12 02:12:15 keving
39     * nothing
40     *
41     * Revision 1.1 1993/07/22 22:24:23 keving
42     * nothing
43     *
44     */
45    
46    
47     #include "general.h"
48    
49    
50     #ifdef FORCE_BIG_ENDIAN
51     /* leave byte order as it is */
52     #define htonl(x) (x)
53     #define ntohl(x) (x)
54     #define htons(x) (x)
55     #define ntohs(x) (x)
56     #else
57     #ifdef FORCE_LITTLE_ENDIAN
58     /* need to reverse byte order */
59     /* note -- we assume here that htonl is called on a variable, not a
60     * constant; thus, this is not for general use, but works with bitio.c
61     */
62     #define htonl(x) \
63     ((((unsigned char *)(&x))[0] << 24) | \
64     (((unsigned char *)(&x))[1] << 16) | \
65     (((unsigned char *)(&x))[2] << 8) | \
66     (((unsigned char *)(&x))[3]))
67     #define ntohl(x) htonl(x)
68     #define htons(x) \
69     ((((unsigned char *)(&x))[0] << 8) | \
70     ((unsigned char *)(&x))[1])
71     #define ntohs(x) htons(x)
72     #else
73     /* let in.h handle it, if possible */
74     #include <sys/types.h>
75     #include <netinet/in.h>
76     #endif /* FORCE_LITTLE_ENDIAN */
77     #endif /* FORCE_BIG_ENDIAN */