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 | */ | |
6162e6b7 MJ |
19 | void bt_uuid_generate(bt_uuid_t uuid_out) |
20 | { | |
21 | int i; | |
22 | GRand *rand; | |
23 | ||
24 | BT_ASSERT(uuid_out); | |
25 | ||
26 | rand = g_rand_new(); | |
27 | ||
28 | /* | |
29 | * Generate 16 bytes of random bits. | |
30 | */ | |
31 | for (i = 0; i < BT_UUID_LEN; i++) { | |
32 | uuid_out[i] = (uint8_t) g_rand_int(rand); | |
33 | } | |
34 | ||
35 | /* | |
36 | * Set the two most significant bits (bits 6 and 7) of the | |
37 | * clock_seq_hi_and_reserved to zero and one, respectively. | |
38 | */ | |
39 | uuid_out[8] &= ~(1 << 6); | |
40 | uuid_out[8] |= (1 << 7); | |
41 | ||
42 | /* | |
43 | * Set the four most significant bits (bits 12 through 15) of the | |
44 | * time_hi_and_version field to the 4-bit version number from | |
45 | * Section 4.1.3. | |
46 | */ | |
47 | uuid_out[6] &= 0x0f; | |
48 | uuid_out[6] |= (BT_UUID_VER << 4); | |
49 | ||
50 | g_rand_free(rand); | |
51 | } | |
52 | ||
6162e6b7 MJ |
53 | void bt_uuid_to_str(const bt_uuid_t uuid_in, char *str_out) |
54 | { | |
98b15851 PP |
55 | BT_ASSERT_DBG(uuid_in); |
56 | BT_ASSERT_DBG(str_out); | |
6162e6b7 | 57 | |
495dd92c | 58 | snprintf(str_out, BT_UUID_STR_LEN + 1, BT_UUID_FMT, BT_UUID_FMT_VALUES(uuid_in)); |
6162e6b7 MJ |
59 | } |
60 | ||
6162e6b7 MJ |
61 | int bt_uuid_from_str(const char *str_in, bt_uuid_t uuid_out) |
62 | { | |
63 | int ret = 0; | |
64 | bt_uuid_t uuid_scan; | |
65 | ||
98b15851 PP |
66 | BT_ASSERT_DBG(uuid_out); |
67 | BT_ASSERT_DBG(str_in); | |
6162e6b7 MJ |
68 | |
69 | if (strnlen(str_in, BT_UUID_STR_LEN + 1) != BT_UUID_STR_LEN) { | |
70 | ret = -1; | |
71 | goto end; | |
72 | } | |
73 | ||
74 | /* Scan to a temporary location in case of a partial match. */ | |
75 | if (sscanf(str_in, BT_UUID_FMT, BT_UUID_SCAN_VALUES(uuid_scan)) != BT_UUID_LEN) { | |
76 | ret = -1; | |
77 | } | |
78 | ||
79 | bt_uuid_copy(uuid_out, uuid_scan); | |
80 | end: | |
81 | return ret; | |
82 | } | |
83 | ||
6162e6b7 MJ |
84 | int bt_uuid_compare(const bt_uuid_t uuid_a, const bt_uuid_t uuid_b) |
85 | { | |
00f637fd | 86 | return memcmp(uuid_a, uuid_b, BT_UUID_LEN); |
6162e6b7 MJ |
87 | } |
88 | ||
6162e6b7 MJ |
89 | void bt_uuid_copy(bt_uuid_t uuid_dest, const bt_uuid_t uuid_src) |
90 | { | |
91 | BT_ASSERT(uuid_dest); | |
92 | BT_ASSERT(uuid_src); | |
93 | BT_ASSERT(uuid_dest != uuid_src); | |
94 | ||
95 | memcpy(uuid_dest, uuid_src, BT_UUID_LEN); | |
96 | } |