-
Notifications
You must be signed in to change notification settings - Fork 154
/
byteorder.h
99 lines (88 loc) · 3.46 KB
/
byteorder.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
/* byteorder.h -- convert 32 and 64-bit values between host and network byte order
*
* Copyright (c) 1994-2008 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Carnegie Mellon University
* Center for Technology Transfer and Enterprise Creation
* 4615 Forbes Avenue
* Suite 302
* Pittsburgh, PA 15213
* (412) 268-7393, fax: (412) 268-7395
* innovation@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _BYTEORDER_H
#define _BYTEORDER_H
#include <config.h>
/* http://stackoverflow.com/a/4410728/94253 */
#if defined(__linux__) || defined(__OpenBSD__)
# include <endian.h>
#elif defined(__FreeBSD__) || defined(__NetBSD__)
# include <sys/endian.h>
#endif
/* 64-bit host/network byte-order swap macros */
#if defined (WORDS_BIGENDIAN)
/* htonl and ntohl already provided */
# define htonll(x) (x)
# define ntohll(x) (x)
#else /* small-endian machines */
# if defined(__GNUC__) && ((__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4)
/* Remove existing macros if present */
# undef ntohs
# undef htons
# undef ntohl
# undef htonl
/* These optimise to single instructions in gcc */
# define ntohs(i) __builtin_bswap16(i)
# define htons(i) __builtin_bswap16(i)
# define ntohl(i) __builtin_bswap32(i)
# define htonl(i) __builtin_bswap32(i)
# define ntohll(i) __builtin_bswap64(i)
# define htonll(i) __builtin_bswap64(i)
# elif defined (be64toh) && defined(htobe64)
/* htonl and ntohl already provided */
/* endian.h versions */
# define htonll(x) htobe64(x)
# define ntohll(x) be64toh(x)
# else
/* htonl and ntohl already provided */
/* our own implementations */
# define CYRUS_BYTESWAP
extern uint64_t _htonll(uint64_t);
extern uint64_t _ntohll(uint64_t);
# define htonll(x) _htonll(x)
# define ntohll(x) _ntohll(x)
# endif
#endif
/* 64-bit host/network byte-order swap functions to/from non-aligned buffers */
extern void *align_htonll(void *dst, uint64_t src);
extern uint64_t align_ntohll(const void *src);
#endif /* _BYTEORDER_H */