| 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 | |
| 20 | #ifndef unaligned_h |
| 21 | #define unaligned_h |
| 22 | |
| 23 | #include <stdint.h> |
| 24 | #include "util.h" |
| 25 | |
| 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 | |
| 36 | #define put_uint8(a,v) do {(a)[0]=((v)&0xff);} while(0) |
| 37 | |
| 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]) |
| 41 | |
| 42 | #define get_uint16(a) (((uint16_t)(a)[0]<<8)|(uint16_t)(a)[1]) |
| 43 | |
| 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) |
| 64 | |
| 65 | #endif /* unaligned_h */ |