-
-
Notifications
You must be signed in to change notification settings - Fork 1
/
uuid.h
155 lines (135 loc) · 4.45 KB
/
uuid.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
// github.com/mist64/xhyve/blob/master/include/xhyve/support/uuid.h
/*-
* Copyright (c) 2002,2005 Marcel Moolenaar
* Copyright (c) 2002 Hiten Mahesh Pandya
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#pragma once
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#define _UUID_NODE_LEN 6
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wpadded"
struct uuid {
uint32_t time_low;
uint16_t time_mid;
uint16_t time_hi_and_version;
uint8_t clock_seq_hi_and_reserved;
uint8_t clock_seq_low;
uint8_t node[_UUID_NODE_LEN];
};
#pragma clang diagnostic pop
typedef struct uuid uuid_internal_t;
/*
* This implementation mostly conforms to the DCE 1.1 specification.
* See Also:
* uuidgen(1), uuidgen(2), uuid(3)
*/
/* Status codes returned by the functions. */
#define uuid_s_ok 0
#define uuid_s_bad_version 1
#define uuid_s_invalid_string_uuid 2
#define uuid_s_no_memory 3
/*
* uuid_create_nil() - create a nil UUID.
* See also:
* http://www.opengroup.org/onlinepubs/009629399/uuid_create_nil.htm
*/
static inline void
uuid_create_nil(uuid_t *u, uint32_t *status)
{
if (status)
*status = uuid_s_ok;
bzero(u, sizeof(*u));
}
static inline void
uuid_enc_le(void *buf, uuid_t *uuid)
{
uuid_internal_t *u = (uuid_internal_t *) ((void *) uuid);
uint8_t *p = buf;
int i;
memcpy(p, &u->time_low, 4);
memcpy(p, &u->time_mid, 2);
memcpy(p, &u->time_hi_and_version, 2);
p[8] = u->clock_seq_hi_and_reserved;
p[9] = u->clock_seq_low;
for (i = 0; i < _UUID_NODE_LEN; i++)
p[10 + i] = u->node[i];
}
/*
* uuid_from_string() - convert a string representation of an UUID into
* a binary representation.
* See also:
* http://www.opengroup.org/onlinepubs/009629399/uuid_from_string.htm
*
* NOTE: The sequence field is in big-endian, while the time fields are in
* native byte order.
*/
static inline void
uuid_from_string(const char *s, uuid_t *uuid, uint32_t *status)
{
uuid_internal_t *u = (uuid_internal_t *) ((void *) uuid);
int n;
/* Short-circuit 2 special cases: NULL pointer and empty string. */
if (s == NULL || *s == '\0') {
uuid_create_nil(((uuid_t *) u), status);
return;
}
/* Assume the worst. */
if (status != NULL)
*status = uuid_s_invalid_string_uuid;
/* The UUID string representation has a fixed length. */
if (strlen(s) != 36)
return;
/*
* We only work with "new" UUIDs. New UUIDs have the form:
* 01234567-89ab-cdef-0123-456789abcdef
* The so called "old" UUIDs, which we don't support, have the form:
* 0123456789ab.cd.ef.01.23.45.67.89.ab
*/
if (s[8] != '-')
return;
n = sscanf(s,
"%8x-%4hx-%4hx-%2hhx%2hhx-%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx",
&u->time_low, &u->time_mid, &u->time_hi_and_version,
&u->clock_seq_hi_and_reserved, &u->clock_seq_low, &u->node[0],
&u->node[1], &u->node[2], &u->node[3], &u->node[4], &u->node[5]);
/* Make sure we have all conversions. */
if (n != 11)
return;
/* We have a successful scan. Check semantics... */
n = u->clock_seq_hi_and_reserved;
if ((n & 0x80) != 0x00 && /* variant 0? */
(n & 0xc0) != 0x80 && /* variant 1? */
(n & 0xe0) != 0xc0) { /* variant 2? */
if (status != NULL)
*status = uuid_s_bad_version;
} else {
if (status != NULL)
*status = uuid_s_ok;
}
}