blob: 474d64a5a4e317b8938ac3073f563156c0b57811
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * uuid.c -- utility routines for manipulating UUID's. |
4 | */ |
5 | |
6 | #include <stdio.h> |
7 | #include <string.h> |
8 | #include "../ext2fs/ext2_types.h" |
9 | |
10 | #include "e2p.h" |
11 | |
12 | struct uuid { |
13 | __u32 time_low; |
14 | __u16 time_mid; |
15 | __u16 time_hi_and_version; |
16 | __u16 clock_seq; |
17 | __u8 node[6]; |
18 | }; |
19 | |
20 | /* Returns 1 if the uuid is the NULL uuid */ |
21 | int e2p_is_null_uuid(void *uu) |
22 | { |
23 | __u8 *cp; |
24 | int i; |
25 | |
26 | for (i=0, cp = uu; i < 16; i++) |
27 | if (*cp) |
28 | return 0; |
29 | return 1; |
30 | } |
31 | |
32 | static void e2p_unpack_uuid(void *in, struct uuid *uu) |
33 | { |
34 | __u8 *ptr = in; |
35 | __u32 tmp; |
36 | |
37 | tmp = *ptr++; |
38 | tmp = (tmp << 8) | *ptr++; |
39 | tmp = (tmp << 8) | *ptr++; |
40 | tmp = (tmp << 8) | *ptr++; |
41 | uu->time_low = tmp; |
42 | |
43 | tmp = *ptr++; |
44 | tmp = (tmp << 8) | *ptr++; |
45 | uu->time_mid = tmp; |
46 | |
47 | tmp = *ptr++; |
48 | tmp = (tmp << 8) | *ptr++; |
49 | uu->time_hi_and_version = tmp; |
50 | |
51 | tmp = *ptr++; |
52 | tmp = (tmp << 8) | *ptr++; |
53 | uu->clock_seq = tmp; |
54 | |
55 | memcpy(uu->node, ptr, 6); |
56 | } |
57 | |
58 | void e2p_uuid_to_str(void *uu, char *out) |
59 | { |
60 | struct uuid uuid; |
61 | |
62 | e2p_unpack_uuid(uu, &uuid); |
63 | sprintf(out, |
64 | "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x", |
65 | uuid.time_low, uuid.time_mid, uuid.time_hi_and_version, |
66 | uuid.clock_seq >> 8, uuid.clock_seq & 0xFF, |
67 | uuid.node[0], uuid.node[1], uuid.node[2], |
68 | uuid.node[3], uuid.node[4], uuid.node[5]); |
69 | } |
70 | |
71 | const char *e2p_uuid2str(void *uu) |
72 | { |
73 | static char buf[80]; |
74 | if (e2p_is_null_uuid(uu)) |
75 | return "<none>"; |
76 | e2p_uuid_to_str(uu, buf); |
77 | return buf; |
78 | } |
79 |