Asterisk - The Open Source Telephony Project GIT-master-2de1a68
unaligned.h
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1/*
2 * Asterisk -- An open source telephony toolkit.
3 *
4 * Copyright (C) 1999 - 2009, Digium, Inc.
5 *
6 * Mark Spencer <markster@digium.com>
7 *
8 * See http://www.asterisk.org for more information about
9 * the Asterisk project. Please do not directly contact
10 * any of the maintainers of this project for assistance;
11 * the project provides a web site, mailing lists and IRC
12 * channels for your use.
13 *
14 * This program is free software, distributed under the terms of
15 * the GNU General Public License Version 2. See the LICENSE file
16 * at the top of the source tree.
17 */
18
19/*! \file
20 * \brief Handle unaligned data access
21 */
22
23#ifndef _ASTERISK_UNALIGNED_H
24#define _ASTERISK_UNALIGNED_H
25
26#if defined(__cplusplus) || defined(c_plusplus)
27extern "C" {
28#endif
29
30#ifdef __GNUC__
31/* If we just tell GCC what's going on, we can trust it to behave optimally */
32static inline uint64_t get_unaligned_uint64(const void *p)
33{
34 const struct { uint64_t d; } __attribute__((packed)) *pp = p;
35 return pp->d;
36}
37
38static inline unsigned int get_unaligned_uint32(const void *p)
39{
40 const struct { unsigned int d; } __attribute__((packed)) *pp = p;
41
42 return pp->d;
43}
44static inline unsigned short get_unaligned_uint16(const void *p)
45{
46 const struct { unsigned short d; } __attribute__((packed)) *pp = p;
47
48 return pp->d;
49}
50
51static inline void put_unaligned_uint64(void *p, uint64_t datum)
52{
53 struct { uint64_t d; } __attribute__((packed,may_alias)) *pp = p;
54
55 pp->d = datum;
56}
57
58static inline void put_unaligned_uint32(void *p, unsigned int datum)
59{
60 struct { unsigned int d; } __attribute__((packed)) *pp = p;
61
62 pp->d = datum;
63}
64
65static inline void put_unaligned_uint16(void *p, unsigned short datum)
66{
67 struct { unsigned short d; } __attribute__((packed)) *pp = p;
68
69 pp->d = datum;
70}
71#elif defined(SOLARIS) && defined(__sparc__)
72static inline uint64_t get_unaligned_uint64(const void *p)
73{
74 const unsigned char *cp = p;
75
76 return
77 (((uint64_t) cp[0]) << 56) |
78 (((uint64_t) cp[1]) << 48) |
79 (((uint64_t) cp[2]) << 40) |
80 (((uint64_t) cp[3]) << 32) |
81 (((uint64_t) cp[4]) << 24) |
82 (((uint64_t) cp[5]) << 16) |
83 (((uint64_t) cp[6]) << 8) |
84 (((uint64_t) cp[7]) << 0);
85}
86
87static inline unsigned int get_unaligned_uint32(const void *p)
88{
89 const unsigned char *cp = p;
90
91 return (cp[0] << 24) | (cp[1] << 16) | (cp[2] << 8) | cp[3];
92}
93
94static inline unsigned short get_unaligned_uint16(const void *p)
95{
96 const unsigned char *cp = p;
97
98 return (cp[0] << 8) | cp[1] ;
99}
100
101static inline void put_unaligned_uint64(void *p, uint64_t datum)
102{
103 unsigned char *cp = p;
104
105 cp[0] = (datum >> 56) & 0xff;
106 cp[1] = (datum >> 48) & 0xff;
107 cp[2] = (datum >> 40) & 0xff;
108 cp[3] = (datum >> 32) & 0xff;
109 cp[4] = (datum >> 24) & 0xff;
110 cp[5] = (datum >> 16) & 0xff;
111 cp[6] = (datum >> 8) & 0xff;
112 cp[7] = (datum >> 0) & 0xff;
113}
114
115static inline void put_unaligned_uint32(void *p, unsigned int datum)
116{
117 unsigned char *cp = p;
118
119 cp[0] = datum >> 24;
120 cp[1] = datum >> 16;
121 cp[2] = datum >> 8;
122 cp[3] = datum;
123}
124
125static inline void put_unaligned_uint16(void *p, unsigned int datum)
126{
127 unsigned char *cp = p;
128
129 cp[0] = datum >> 8;
130 cp[1] = datum;
131}
132#else /* Not GCC, not Solaris/SPARC. Assume we can handle direct load/store. */
133#define get_unaligned_uint64(p) (*((uint64_t *)(p)))
134#define get_unaligned_uint32(p) (*((unsigned int *)(p)))
135#define get_unaligned_uint16(p) (*((unsigned short *)(p)))
136#define put_unaligned_uint64(p,d) do { uint64_t *__P = (p); *__P = d; } while(0)
137#define put_unaligned_uint32(p,d) do { unsigned int *__P = (p); *__P = d; } while(0)
138#define put_unaligned_uint16(p,d) do { unsigned short *__P = (p); *__P = d; } while(0)
139#endif
140
141#if defined(__cplusplus) || defined(c_plusplus)
142}
143#endif
144
145
146#endif /* _ASTERISK_UNALIGNED_H */
Definition: ndbm.h:57
static struct test_val d
static unsigned int get_unaligned_uint32(const void *p)
Definition: unaligned.h:38
static void put_unaligned_uint16(void *p, unsigned short datum)
Definition: unaligned.h:65
static unsigned short get_unaligned_uint16(const void *p)
Definition: unaligned.h:44
static void put_unaligned_uint64(void *p, uint64_t datum)
Definition: unaligned.h:51
static void put_unaligned_uint32(void *p, unsigned int datum)
Definition: unaligned.h:58
static uint64_t get_unaligned_uint64(const void *p)
Definition: unaligned.h:32