mpeg_encode/src/byteorder.h

/*===========================================================================*
 * byteorder.h                                                               *
 *                                                                           *
 *      stuff to handle different byte order                                 *
 *                                                                           *
 *===========================================================================*/

/*
 * Copyright (c) 1995 The Regents of the University of California.
 * All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose, without fee, and without written agreement is
 * hereby granted, provided that the above copyright notice and the following
 * two paragraphs appear in all copies of this software.
 *
 * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
 * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
 * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
 */

/*  
 *  $Header: /u/smoot/md/mpeg_encode/headers/RCS/byteorder.h,v 1.3 1995/01/19 23:54:39 eyhung Exp $
 *  $Log: byteorder.h,v $
 * Revision 1.3  1995/01/19  23:54:39  eyhung
 * Changed copyrights
 *
 * Revision 1.3  1995/01/19  23:54:39  eyhung
 * Changed copyrights
 *
 * Revision 1.2  1994/11/12  02:12:15  keving
 * nothing
 *
 * Revision 1.1  1993/07/22  22:24:23  keving
 * nothing
 *
 */


#include "general.h"


#ifdef FORCE_BIG_ENDIAN
    /* leave byte order as it is */
#define htonl(x) (x)
#define ntohl(x) (x)
#define htons(x) (x)
#define ntohs(x) (x)
#else
#ifdef FORCE_LITTLE_ENDIAN
    /* need to reverse byte order */
    /* note -- we assume here that htonl is called on a variable, not a
     * constant; thus, this is not for general use, but works with bitio.c
     */
#define htonl(x)    \
    ((((unsigned char *)(&x))[0] << 24) |       \
     (((unsigned char *)(&x))[1] << 16) |       \
     (((unsigned char *)(&x))[2] << 8) |        \
     (((unsigned char *)(&x))[3]))
#define ntohl(x)    htonl(x)
#define htons(x)    \
    ((((unsigned char *)(&x))[0] << 8) |        \
     ((unsigned char *)(&x))[1])
#define ntohs(x)    htons(x)
#else
    /* let in.h handle it, if possible */                  
#include <sys/types.h>
#include <netinet/in.h>
#endif /* FORCE_LITTLE_ENDIAN */
#endif /* FORCE_BIG_ENDIAN */
Revision:	22
Committed:	Mon Jul 7 22:16:37 2008 UTC (12 years, 6 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 */