ppc/pnv: Add support for POWER8+ LPC Controller
[qemu.git] / util / uuid.c
1 /*
2 * QEMU UUID functions
3 *
4 * Copyright 2016 Red Hat, Inc.
5 *
6 * Authors:
7 * Fam Zheng <famz@redhat.com>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)
12 * any later version.
13 *
14 */
15
16 #include "qemu/osdep.h"
17 #include "qemu-common.h"
18 #include "qemu/uuid.h"
19 #include "qemu/bswap.h"
20
21 void qemu_uuid_generate(QemuUUID *uuid)
22 {
23 int i;
24 uint32_t tmp[4];
25
26 QEMU_BUILD_BUG_ON(sizeof(QemuUUID) != 16);
27
28 for (i = 0; i < 4; ++i) {
29 tmp[i] = g_random_int();
30 }
31 memcpy(uuid, tmp, sizeof(tmp));
32 /* Set the two most significant bits (bits 6 and 7) of the
33 clock_seq_hi_and_reserved to zero and one, respectively. */
34 uuid->data[8] = (uuid->data[8] & 0x3f) | 0x80;
35 /* Set the four most significant bits (bits 12 through 15) of the
36 time_hi_and_version field to the 4-bit version number.
37 */
38 uuid->data[6] = (uuid->data[6] & 0xf) | 0x40;
39 }
40
41 int qemu_uuid_is_null(const QemuUUID *uu)
42 {
43 static QemuUUID null_uuid;
44 return memcmp(uu, &null_uuid, sizeof(QemuUUID)) == 0;
45 }
46
47 void qemu_uuid_unparse(const QemuUUID *uuid, char *out)
48 {
49 const unsigned char *uu = &uuid->data[0];
50 snprintf(out, UUID_FMT_LEN + 1, UUID_FMT,
51 uu[0], uu[1], uu[2], uu[3], uu[4], uu[5], uu[6], uu[7],
52 uu[8], uu[9], uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]);
53 }
54
55 char *qemu_uuid_unparse_strdup(const QemuUUID *uuid)
56 {
57 const unsigned char *uu = &uuid->data[0];
58 return g_strdup_printf(UUID_FMT,
59 uu[0], uu[1], uu[2], uu[3], uu[4], uu[5], uu[6],
60 uu[7], uu[8], uu[9], uu[10], uu[11], uu[12],
61 uu[13], uu[14], uu[15]);
62 }
63
64 static bool qemu_uuid_is_valid(const char *str)
65 {
66 int i;
67
68 for (i = 0; i < strlen(str); i++) {
69 const char c = str[i];
70 if (i == 8 || i == 13 || i == 18 || i == 23) {
71 if (str[i] != '-') {
72 return false;
73 }
74 } else {
75 if ((c >= '0' && c <= '9') ||
76 (c >= 'A' && c <= 'F') ||
77 (c >= 'a' && c <= 'f')) {
78 continue;
79 }
80 return false;
81 }
82 }
83 return i == 36;
84 }
85
86 int qemu_uuid_parse(const char *str, QemuUUID *uuid)
87 {
88 unsigned char *uu = &uuid->data[0];
89 int ret;
90
91 if (!qemu_uuid_is_valid(str)) {
92 return -1;
93 }
94
95 ret = sscanf(str, UUID_FMT, &uu[0], &uu[1], &uu[2], &uu[3],
96 &uu[4], &uu[5], &uu[6], &uu[7], &uu[8], &uu[9],
97 &uu[10], &uu[11], &uu[12], &uu[13], &uu[14],
98 &uu[15]);
99
100 if (ret != 16) {
101 return -1;
102 }
103 return 0;
104 }
105
106 /* Swap from UUID format endian (BE) to the opposite or vice versa.
107 */
108 void qemu_uuid_bswap(QemuUUID *uuid)
109 {
110 assert(QEMU_PTR_IS_ALIGNED(uuid, sizeof(uint32_t)));
111 bswap32s(&uuid->fields.time_low);
112 bswap16s(&uuid->fields.time_mid);
113 bswap16s(&uuid->fields.time_high_and_version);
114 }