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