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59635212 SE |
1 | #ifndef unaligned_h |
2 | #define unaligned_h | |
3 | ||
6fbd4b99 IJ |
4 | #include <stdint.h> |
5 | ||
59635212 SE |
6 | /* Parts of the secnet key-exchange protocol require access to |
7 | unaligned big-endian quantities in buffers. These macros provide | |
8 | convenient access, even on architectures that don't support unaligned | |
9 | accesses. */ | |
10 | ||
11 | #define put_uint32(a,v) do { (a)[0]=(v)>>24; (a)[1]=((v)&0xff0000)>>16; \ | |
12 | (a)[2]=((v)&0xff00)>>8; (a)[3]=(v)&0xff; } while(0) | |
13 | ||
14 | #define put_uint16(a,v) do {(a)[0]=((v)&0xff00)>>8; (a)[1]=(v)&0xff;} while(0) | |
15 | ||
6fbd4b99 IJ |
16 | #define get_uint32(a) \ |
17 | (((uint32_t)(a)[0]<<24) | ((uint32_t)(a)[1]<<16) | \ | |
18 | ((uint32_t)(a)[2]<<8) | (uint32_t)(a)[3]) | |
59635212 | 19 | |
6fbd4b99 | 20 | #define get_uint16(a) (((uint16_t)(a)[0]<<8)|(uint16_t)(a)[1]) |
59635212 SE |
21 | |
22 | #define buf_append_uint32(buf,v) do { uint8_t *c=buf_append((buf),4); \ | |
23 | put_uint32(c,(v)); } while(0) | |
24 | ||
25 | #define buf_append_uint16(buf,v) do { uint8_t *c=buf_append((buf),2); \ | |
26 | put_uint16(c,(v)); } while(0) | |
27 | ||
28 | #define buf_prepend_uint32(buf,v) do { uint8_t *c=buf_prepend((buf),4); \ | |
29 | put_uint32(c,(v)); } while(0) | |
30 | ||
31 | #define buf_prepend_uint16(buf,v) do { uint8_t *c=buf_prepend((buf),2); \ | |
32 | put_uint16(c,(v)); } while(0) | |
33 | ||
34 | #define buf_unappend_uint32(buf) ({uint8_t *c=buf_unappend((buf),4); \ | |
35 | get_uint32(c);}) | |
36 | ||
37 | #define buf_unappend_uint16(buf) ({uint8_t *c=buf_unappend((buf),2); \ | |
38 | get_uint16(c);}) | |
39 | ||
40 | #define buf_unprepend_uint32(buf) ({uint8_t *c=buf_unprepend((buf),4); \ | |
41 | get_uint32(c);}) | |
42 | ||
43 | #define buf_unprepend_uint16(buf) ({uint8_t *c=buf_unprepend((buf),2); \ | |
44 | get_uint16(c);}) | |
45 | ||
46 | #endif /* unaligned_h */ |