1 /*
2 * uuid.c -- utility routines for manipulating UUID's.
3 *
4 * %Begin-Header%
5 * This file may be redistributed under the terms of the GNU Library
6 * General Public License, version 2.
7 * %End-Header%
8 */
9
10 #include "config.h"
11 #include <stdio.h>
12 #include <string.h>
13 #include <ext2fs/ext2_types.h>
14
15 #include "e2p.h"
16
17 struct uuid {
18 __u32 time_low;
19 __u16 time_mid;
20 __u16 time_hi_and_version;
21 __u16 clock_seq;
22 __u8 node[6];
23 };
24
25 /* Returns 1 if the uuid is the NULL uuid */
e2p_is_null_uuid(void * uu)26 int e2p_is_null_uuid(void *uu)
27 {
28 __u8 *cp;
29 int i;
30
31 for (i=0, cp = uu; i < 16; i++)
32 if (*cp++)
33 return 0;
34 return 1;
35 }
36
e2p_unpack_uuid(void * in,struct uuid * uu)37 static void e2p_unpack_uuid(void *in, struct uuid *uu)
38 {
39 __u8 *ptr = in;
40 __u32 tmp;
41
42 tmp = *ptr++;
43 tmp = (tmp << 8) | *ptr++;
44 tmp = (tmp << 8) | *ptr++;
45 tmp = (tmp << 8) | *ptr++;
46 uu->time_low = tmp;
47
48 tmp = *ptr++;
49 tmp = (tmp << 8) | *ptr++;
50 uu->time_mid = tmp;
51
52 tmp = *ptr++;
53 tmp = (tmp << 8) | *ptr++;
54 uu->time_hi_and_version = tmp;
55
56 tmp = *ptr++;
57 tmp = (tmp << 8) | *ptr++;
58 uu->clock_seq = tmp;
59
60 memcpy(uu->node, ptr, 6);
61 }
62
e2p_uuid_to_str(void * uu,char * out)63 void e2p_uuid_to_str(void *uu, char *out)
64 {
65 struct uuid uuid;
66
67 e2p_unpack_uuid(uu, &uuid);
68 sprintf(out,
69 "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
70 uuid.time_low, uuid.time_mid, uuid.time_hi_and_version,
71 uuid.clock_seq >> 8, uuid.clock_seq & 0xFF,
72 uuid.node[0], uuid.node[1], uuid.node[2],
73 uuid.node[3], uuid.node[4], uuid.node[5]);
74 }
75
e2p_uuid2str(void * uu)76 const char *e2p_uuid2str(void *uu)
77 {
78 static char buf[80];
79
80 if (e2p_is_null_uuid(uu))
81 return "<none>";
82 e2p_uuid_to_str(uu, buf);
83 return buf;
84 }
85
86