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c215a4bc IJ |
1 | /* |
2 | * This file is part of secnet. | |
3 | * See README for full list of copyright holders. | |
4 | * | |
5 | * secnet is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version d of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * secnet is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * version 3 along with secnet; if not, see | |
17 | * https://www.gnu.org/licenses/gpl.html. | |
18 | */ | |
19 | ||
59635212 SE |
20 | #ifndef unaligned_h |
21 | #define unaligned_h | |
22 | ||
6fbd4b99 | 23 | #include <stdint.h> |
993db2a6 | 24 | #include "util.h" |
6fbd4b99 | 25 | |
59635212 SE |
26 | /* Parts of the secnet key-exchange protocol require access to |
27 | unaligned big-endian quantities in buffers. These macros provide | |
28 | convenient access, even on architectures that don't support unaligned | |
29 | accesses. */ | |
30 | ||
31 | #define put_uint32(a,v) do { (a)[0]=(v)>>24; (a)[1]=((v)&0xff0000)>>16; \ | |
32 | (a)[2]=((v)&0xff00)>>8; (a)[3]=(v)&0xff; } while(0) | |
33 | ||
34 | #define put_uint16(a,v) do {(a)[0]=((v)&0xff00)>>8; (a)[1]=(v)&0xff;} while(0) | |
35 | ||
993db2a6 IJ |
36 | #define put_uint8(a,v) do {(a)[0]=((v)&0xff);} while(0) |
37 | ||
6fbd4b99 IJ |
38 | #define get_uint32(a) \ |
39 | (((uint32_t)(a)[0]<<24) | ((uint32_t)(a)[1]<<16) | \ | |
40 | ((uint32_t)(a)[2]<<8) | (uint32_t)(a)[3]) | |
59635212 | 41 | |
6fbd4b99 | 42 | #define get_uint16(a) (((uint16_t)(a)[0]<<8)|(uint16_t)(a)[1]) |
59635212 | 43 | |
993db2a6 IJ |
44 | #define get_uint8(a) (((uint8_t)(a)[0])) |
45 | ||
46 | #define UNALIGNED_DEF_FORTYPE(type,appre) \ | |
47 | static inline void buf_##appre##_##type(struct buffer_if *buf, type##_t v) \ | |
48 | { \ | |
49 | uint8_t *c=buf_##appre(buf,sizeof(type##_t)); \ | |
50 | put_##type(c,v); \ | |
51 | } \ | |
52 | static inline type##_t buf_un##appre##_##type(struct buffer_if *buf) \ | |
53 | { \ | |
54 | const uint8_t *c=buf_un##appre(buf,sizeof(type##_t)); \ | |
55 | return get_##type(c); \ | |
56 | } | |
57 | ||
58 | UNALIGNED_DEF_FORTYPE(uint32,append) | |
59 | UNALIGNED_DEF_FORTYPE(uint16,append) | |
60 | UNALIGNED_DEF_FORTYPE(uint8,append) | |
61 | UNALIGNED_DEF_FORTYPE(uint32,prepend) | |
62 | UNALIGNED_DEF_FORTYPE(uint16,prepend) | |
63 | UNALIGNED_DEF_FORTYPE(uint8,prepend) | |
59635212 SE |
64 | |
65 | #endif /* unaligned_h */ |