Commit | Line | Data |
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6162e6b7 | 1 | /* |
0235b0db | 2 | * SPDX-License-Identifier: MIT |
6162e6b7 | 3 | * |
0235b0db | 4 | * Copyright (C) 2019 Michael Jeanson <mjeanson@efficios.com> |
6162e6b7 MJ |
5 | */ |
6 | ||
7 | #include <glib.h> | |
8 | #include <stdio.h> | |
9 | #include <string.h> | |
10 | #include <inttypes.h> | |
11 | ||
12 | #include "common/assert.h" | |
13 | #include "common/uuid.h" | |
14 | ||
15 | ||
16 | /* | |
17 | * Generate a random UUID according to RFC4122, section 4.4. | |
18 | */ | |
19 | BT_HIDDEN | |
20 | void bt_uuid_generate(bt_uuid_t uuid_out) | |
21 | { | |
22 | int i; | |
23 | GRand *rand; | |
24 | ||
25 | BT_ASSERT(uuid_out); | |
26 | ||
27 | rand = g_rand_new(); | |
28 | ||
29 | /* | |
30 | * Generate 16 bytes of random bits. | |
31 | */ | |
32 | for (i = 0; i < BT_UUID_LEN; i++) { | |
33 | uuid_out[i] = (uint8_t) g_rand_int(rand); | |
34 | } | |
35 | ||
36 | /* | |
37 | * Set the two most significant bits (bits 6 and 7) of the | |
38 | * clock_seq_hi_and_reserved to zero and one, respectively. | |
39 | */ | |
40 | uuid_out[8] &= ~(1 << 6); | |
41 | uuid_out[8] |= (1 << 7); | |
42 | ||
43 | /* | |
44 | * Set the four most significant bits (bits 12 through 15) of the | |
45 | * time_hi_and_version field to the 4-bit version number from | |
46 | * Section 4.1.3. | |
47 | */ | |
48 | uuid_out[6] &= 0x0f; | |
49 | uuid_out[6] |= (BT_UUID_VER << 4); | |
50 | ||
51 | g_rand_free(rand); | |
52 | } | |
53 | ||
54 | BT_HIDDEN | |
55 | void bt_uuid_to_str(const bt_uuid_t uuid_in, char *str_out) | |
56 | { | |
98b15851 PP |
57 | BT_ASSERT_DBG(uuid_in); |
58 | BT_ASSERT_DBG(str_out); | |
6162e6b7 MJ |
59 | |
60 | sprintf(str_out, BT_UUID_FMT, BT_UUID_FMT_VALUES(uuid_in)); | |
61 | } | |
62 | ||
63 | BT_HIDDEN | |
64 | int bt_uuid_from_str(const char *str_in, bt_uuid_t uuid_out) | |
65 | { | |
66 | int ret = 0; | |
67 | bt_uuid_t uuid_scan; | |
68 | ||
98b15851 PP |
69 | BT_ASSERT_DBG(uuid_out); |
70 | BT_ASSERT_DBG(str_in); | |
6162e6b7 MJ |
71 | |
72 | if (strnlen(str_in, BT_UUID_STR_LEN + 1) != BT_UUID_STR_LEN) { | |
73 | ret = -1; | |
74 | goto end; | |
75 | } | |
76 | ||
77 | /* Scan to a temporary location in case of a partial match. */ | |
78 | if (sscanf(str_in, BT_UUID_FMT, BT_UUID_SCAN_VALUES(uuid_scan)) != BT_UUID_LEN) { | |
79 | ret = -1; | |
80 | } | |
81 | ||
82 | bt_uuid_copy(uuid_out, uuid_scan); | |
83 | end: | |
84 | return ret; | |
85 | } | |
86 | ||
87 | BT_HIDDEN | |
88 | int bt_uuid_compare(const bt_uuid_t uuid_a, const bt_uuid_t uuid_b) | |
89 | { | |
00f637fd | 90 | return memcmp(uuid_a, uuid_b, BT_UUID_LEN); |
6162e6b7 MJ |
91 | } |
92 | ||
93 | BT_HIDDEN | |
94 | void bt_uuid_copy(bt_uuid_t uuid_dest, const bt_uuid_t uuid_src) | |
95 | { | |
96 | BT_ASSERT(uuid_dest); | |
97 | BT_ASSERT(uuid_src); | |
98 | BT_ASSERT(uuid_dest != uuid_src); | |
99 | ||
100 | memcpy(uuid_dest, uuid_src, BT_UUID_LEN); | |
101 | } |