| 1 | #ifndef unaligned_h |
| 2 | #define unaligned_h |
| 3 | |
| 4 | #include <stdint.h> |
| 5 | #include "util.h" |
| 6 | |
| 7 | /* Parts of the secnet key-exchange protocol require access to |
| 8 | unaligned big-endian quantities in buffers. These macros provide |
| 9 | convenient access, even on architectures that don't support unaligned |
| 10 | accesses. */ |
| 11 | |
| 12 | #define put_uint32(a,v) do { (a)[0]=(v)>>24; (a)[1]=((v)&0xff0000)>>16; \ |
| 13 | (a)[2]=((v)&0xff00)>>8; (a)[3]=(v)&0xff; } while(0) |
| 14 | |
| 15 | #define put_uint16(a,v) do {(a)[0]=((v)&0xff00)>>8; (a)[1]=(v)&0xff;} while(0) |
| 16 | |
| 17 | #define put_uint8(a,v) do {(a)[0]=((v)&0xff);} while(0) |
| 18 | |
| 19 | #define get_uint32(a) \ |
| 20 | (((uint32_t)(a)[0]<<24) | ((uint32_t)(a)[1]<<16) | \ |
| 21 | ((uint32_t)(a)[2]<<8) | (uint32_t)(a)[3]) |
| 22 | |
| 23 | #define get_uint16(a) (((uint16_t)(a)[0]<<8)|(uint16_t)(a)[1]) |
| 24 | |
| 25 | #define get_uint8(a) (((uint8_t)(a)[0])) |
| 26 | |
| 27 | #define UNALIGNED_DEF_FORTYPE(type,appre) \ |
| 28 | static inline void buf_##appre##_##type(struct buffer_if *buf, type##_t v) \ |
| 29 | { \ |
| 30 | uint8_t *c=buf_##appre(buf,sizeof(type##_t)); \ |
| 31 | put_##type(c,v); \ |
| 32 | } \ |
| 33 | static inline type##_t buf_un##appre##_##type(struct buffer_if *buf) \ |
| 34 | { \ |
| 35 | const uint8_t *c=buf_un##appre(buf,sizeof(type##_t)); \ |
| 36 | return get_##type(c); \ |
| 37 | } |
| 38 | |
| 39 | UNALIGNED_DEF_FORTYPE(uint32,append) |
| 40 | UNALIGNED_DEF_FORTYPE(uint16,append) |
| 41 | UNALIGNED_DEF_FORTYPE(uint8,append) |
| 42 | UNALIGNED_DEF_FORTYPE(uint32,prepend) |
| 43 | UNALIGNED_DEF_FORTYPE(uint16,prepend) |
| 44 | UNALIGNED_DEF_FORTYPE(uint8,prepend) |
| 45 | |
| 46 | #endif /* unaligned_h */ |