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1 | /* |
2 | * Copyright (c) 2010 Nicira Networks. | |
3 | * | |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at: | |
7 | * | |
8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
15 | */ | |
16 | ||
17 | #ifndef UNALIGNED_H | |
18 | #define UNALIGNED_H 1 | |
19 | ||
20 | #include <stdint.h> | |
10a24935 | 21 | #include "byte-order.h" |
afa3a931 BP |
22 | |
23 | /* Public API. */ | |
24 | static inline uint16_t get_unaligned_u16(const uint16_t *); | |
25 | static inline uint32_t get_unaligned_u32(const uint32_t *); | |
26 | static inline uint64_t get_unaligned_u64(const uint64_t *); | |
27 | static inline void put_unaligned_u16(uint16_t *, uint16_t); | |
28 | static inline void put_unaligned_u32(uint32_t *, uint32_t); | |
29 | static inline void put_unaligned_u64(uint64_t *, uint64_t); | |
30 | ||
31 | #ifdef __GNUC__ | |
32 | /* GCC implementations. */ | |
33 | #define GCC_UNALIGNED_ACCESSORS(SIZE) \ | |
34 | struct unaligned_u##SIZE { \ | |
35 | uint##SIZE##_t x __attribute__((__packed__)); \ | |
36 | }; \ | |
37 | static inline struct unaligned_u##SIZE * \ | |
38 | unaligned_u##SIZE(const uint##SIZE##_t *p) \ | |
39 | { \ | |
40 | return (struct unaligned_u##SIZE *) p; \ | |
41 | } \ | |
42 | \ | |
43 | static inline uint##SIZE##_t \ | |
44 | get_unaligned_u##SIZE(const uint##SIZE##_t *p) \ | |
45 | { \ | |
46 | return unaligned_u##SIZE(p)->x; \ | |
47 | } \ | |
48 | \ | |
49 | static inline void \ | |
50 | put_unaligned_u##SIZE(uint##SIZE##_t *p, uint##SIZE##_t x) \ | |
51 | { \ | |
52 | unaligned_u##SIZE(p)->x = x; \ | |
53 | } | |
54 | ||
55 | GCC_UNALIGNED_ACCESSORS(16); | |
56 | GCC_UNALIGNED_ACCESSORS(32); | |
57 | GCC_UNALIGNED_ACCESSORS(64); | |
58 | #else | |
59 | /* Generic implementations. */ | |
60 | ||
61 | static inline uint16_t get_unaligned_u16(const uint16_t *p_) | |
62 | { | |
63 | const uint8_t *p = (const uint8_t *) p_; | |
64 | return ntohs((p[0] << 8) | p[1]); | |
65 | } | |
66 | ||
67 | static inline void put_unaligned_u16(uint16_t *p_, uint16_t x_) | |
68 | { | |
69 | uint8_t *p = (uint8_t *) p_; | |
70 | uint16_t x = ntohs(x_); | |
71 | ||
72 | p[0] = x >> 8; | |
73 | p[1] = x; | |
74 | } | |
75 | ||
76 | static inline uint32_t get_unaligned_u32(const uint32_t *p_) | |
77 | { | |
78 | const uint8_t *p = (const uint8_t *) p_; | |
79 | return ntohl((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]); | |
80 | } | |
81 | ||
82 | static inline void put_unaligned_u32(uint32_t *p_, uint32_t x_) | |
83 | { | |
84 | uint8_t *p = (uint8_t *) p_; | |
85 | uint32_t x = ntohl(x_); | |
86 | ||
87 | p[0] = x >> 24; | |
88 | p[1] = x >> 16; | |
89 | p[2] = x >> 8; | |
90 | p[3] = x; | |
91 | } | |
92 | ||
93 | static inline uint64_t get_unaligned_u64(const uint64_t *p_) | |
94 | { | |
95 | const uint8_t *p = (const uint8_t *) p_; | |
96 | return ntohll(((uint64_t) p[0] << 56) | |
97 | | ((uint64_t) p[1] << 48) | |
98 | | ((uint64_t) p[2] << 40) | |
99 | | ((uint64_t) p[3] << 32) | |
100 | | (p[4] << 24) | |
101 | | (p[5] << 16) | |
102 | | (p[6] << 8) | |
103 | | p[7]); | |
104 | } | |
105 | ||
106 | static inline void put_unaligned_u64(uint64_t *p_, uint64_t x_) | |
107 | { | |
108 | uint8_t *p = (uint8_t *) p_; | |
109 | uint64_t x = ntohll(x_); | |
110 | ||
111 | p[0] = x >> 56; | |
112 | p[1] = x >> 48; | |
113 | p[2] = x >> 40; | |
114 | p[3] = x >> 32; | |
115 | p[4] = x >> 24; | |
116 | p[5] = x >> 16; | |
117 | p[6] = x >> 8; | |
118 | p[7] = x; | |
119 | } | |
120 | #endif | |
121 | ||
122 | #endif /* unaligned.h */ |