forked from apache/nuttx
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathendian.h
169 lines (141 loc) · 6.11 KB
/
endian.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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
/****************************************************************************
* include/endian.h
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
#ifndef __INCLUDE_ENDIAN_H
#define __INCLUDE_ENDIAN_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/compiler.h>
#include <stdint.h>
/****************************************************************************
* Preprocessor definitions
****************************************************************************/
/* The endian.h header must define at least the following macros for use in
* determining host byte order for integer types:
*
* BYTE_ORDER This macro will have a value equal to one of the *_ENDIAN
* macros in this header.
* LITTLE_ENDIAN If BYTE_ORDER == LITTLE_ENDIAN, the host byte order is
* from least significant to most significant.
* BIG_ENDIAN If BYTE_ORDER == BIG_ENDIAN, the host byte order is from
* most significant to least significant.
*/
#define LITTLE_ENDIAN 1234
#define __LITTLE_ENDIAN 1234
#define BIG_ENDIAN 4321
#define __BIG_ENDIAN 4321
/* Common byte swapping macros */
#ifdef CONFIG_HAVE_BUILTIN_BSWAP16
# define __swap_uint16 __builtin_bswap16
#else
# define __swap_uint16(n) \
(uint16_t)(((((uint16_t)(n)) & 0x00ff) << 8) | \
((((uint16_t)(n)) >> 8) & 0x00ff))
#endif
#ifdef CONFIG_HAVE_BUILTIN_BSWAP32
# define __swap_uint32 __builtin_bswap32
#else
# define __swap_uint32(n) \
(uint32_t)(((((uint32_t)(n)) & 0x000000ffUL) << 24) | \
((((uint32_t)(n)) & 0x0000ff00UL) << 8) | \
((((uint32_t)(n)) & 0x00ff0000UL) >> 8) | \
((((uint32_t)(n)) & 0xff000000UL) >> 24))
#endif
#ifdef CONFIG_HAVE_LONG_LONG
# ifdef CONFIG_HAVE_BUILTIN_BSWAP64
# define __swap_uint64 __builtin_bswap64
# else
# define __swap_uint64(n) \
(uint64_t)(((((uint64_t)(n)) & 0x00000000000000ffULL) << 56) | \
((((uint64_t)(n)) & 0x000000000000ff00ULL) << 40) | \
((((uint64_t)(n)) & 0x0000000000ff0000ULL) << 24) | \
((((uint64_t)(n)) & 0x00000000ff000000ULL) << 8) | \
((((uint64_t)(n)) & 0x000000ff00000000ULL) >> 8) | \
((((uint64_t)(n)) & 0x0000ff0000000000ULL) >> 24) | \
((((uint64_t)(n)) & 0x00ff000000000000ULL) >> 40) | \
((((uint64_t)(n)) & 0xff00000000000000ULL) >> 56))
# endif
#endif
/* Endian-specific definitions */
#ifdef CONFIG_ENDIAN_BIG
/* Big-endian byte order */
# define BYTE_ORDER BIG_ENDIAN
# define __BYTE_ORDER BIG_ENDIAN
/* Big-endian byte order macros */
# define htobe16(n) (n)
# define htole16(n) __swap_uint16((uint16_t)n)
# define be16toh(n) (n)
# define le16toh(n) __swap_uint16((uint16_t)n)
# define htobe32(n) (n)
# define htole32(n) __swap_uint32((uint32_t)n)
# define be32toh(n) (n)
# define le32toh(n) __swap_uint32(n)
# ifdef CONFIG_HAVE_LONG_LONG
# define htobe64(n) (n)
# define htole64(n) __swap_uint64((uint64_t)n)
# define be64toh(n) (n)
# define le64toh(n) __swap_uint64((uint64_t)n)
# endif
#else
/* Little-endian byte order */
# define BYTE_ORDER LITTLE_ENDIAN
# define __BYTE_ORDER __LITTLE_ENDIAN
/* Little-endian byte order macros */
# define htobe16(n) __swap_uint16((uint16_t)n)
# define htole16(n) (n)
# define be16toh(n) __swap_uint16((uint16_t)n)
# define le16toh(n) (n)
# define htobe32(n) __swap_uint32((uint32_t)n)
# define htole32(n) (n)
# define be32toh(n) __swap_uint32((uint32_t)n)
# define le32toh(n) (n)
# ifdef CONFIG_HAVE_LONG_LONG
# define htobe64(n) __swap_uint64((uint64_t)n)
# define htole64(n) (n)
# define be64toh(n) __swap_uint64((uint64_t)n)
# define le64toh(n) (n)
# endif
#endif
/* OpenBSD style */
#define swap16 __swap_uint16
#define swap32 __swap_uint32
#define swap64 __swap_uint64
#define betoh16 be16toh
#define letoh16 le16toh
#define bemtoh16(x) betoh16(*(FAR uint16_t *)(x))
#define htobem16(x, v) (*(FAR uint16_t *)(x) = htobe16(v))
#define lemtoh16(x) letoh16(*(FAR uint16_t *)(x))
#define htolem16(x, v) (*(FAR uint16_t *)(x) = htole16(v))
#define betoh32 be32toh
#define letoh32 le32toh
#define bemtoh32(x) htobe32(*(FAR uint32_t *)(x))
#define htobem32(x, v) (*(FAR uint32_t *)(x) = htobe32(v))
#define lemtoh32(x) letoh32(*(FAR uint32_t *)(x))
#define htolem32(x, v) (*(FAR uint32_t *)(x) = htole32(v))
#ifdef CONFIG_HAVE_LONG_LONG
#define betoh64 be64toh
#define letoh64 le64toh
#define bemtoh64(x) htobe64(*(FAR uint64_t *)(x))
#define htobem64(x, v) (*(FAR uint64_t *)(x) = htobe64(v))
#define lemtoh64(x) letoh64(*(FAR uint64_t *)(x))
#define htolem64(x, v) (*(FAR uint64_t *)(x) = htole64(v))
#endif
#endif /* __INCLUDE_ENDIAN_H */