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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, 2 months ago) by wdelano
File size: 2647 byte(s)
Log Message:
initial checkin of mpeg_encode source
Line File contents
1 /*===========================================================================*
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 */