1/******************************************************************************
2 *
3 *  Copyright (C) 2014 Google, Inc.
4 *
5 *  Licensed under the Apache License, Version 2.0 (the "License");
6 *  you may not use this file except in compliance with the License.
7 *  You may obtain a copy of the License at:
8 *
9 *  http://www.apache.org/licenses/LICENSE-2.0
10 *
11 *  Unless required by applicable law or agreed to in writing, software
12 *  distributed under the License is distributed on an "AS IS" BASIS,
13 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 *  See the License for the specific language governing permissions and
15 *  limitations under the License.
16 *
17 ******************************************************************************/
18
19#include <base/logging.h>
20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
23
24#include "btcore/include/uuid.h"
25#include "osi/include/allocator.h"
26
27static const size_t UUID_WELL_FORMED_STRING_LEN = 36;
28static const size_t UUID_WELL_FORMED_STRING_LEN_WITH_NULL = 36 + 1;
29
30typedef struct uuid_string_t { char string[0]; } uuid_string_t;
31
32static const bt_uuid_t empty_uuid = {{0}};
33
34// The base UUID is used for calculating 128-bit UUIDs from 16 and
35// 32 bit UUIDs as described in the SDP specification.
36static const bt_uuid_t base_uuid = {{
37    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x80, 0x00, 0x00, 0x80,
38    0x5f, 0x9b, 0x34, 0xfb,
39}};
40
41static bool uuid_is_base(const bt_uuid_t* uuid);
42
43uuid_string_t* uuid_string_new(void) {
44  return static_cast<uuid_string_t*>(
45      osi_calloc(UUID_WELL_FORMED_STRING_LEN_WITH_NULL));
46}
47
48void uuid_string_free(uuid_string_t* uuid_string) { osi_free(uuid_string); }
49
50const char* uuid_string_data(const uuid_string_t* uuid_string) {
51  CHECK(uuid_string != NULL);
52  return (const char*)uuid_string->string;
53}
54
55bt_uuid_t* uuid_new(const char* uuid_string) {
56  CHECK(uuid_string != NULL);
57
58  if (strlen(uuid_string) < UUID_WELL_FORMED_STRING_LEN) return NULL;
59  if (uuid_string[8] != '-' || uuid_string[13] != '-' ||
60      uuid_string[18] != '-' || uuid_string[23] != '-')
61    return NULL;
62
63  bt_uuid_t* uuid = static_cast<bt_uuid_t*>(osi_calloc(sizeof(bt_uuid_t)));
64
65  const char* s = uuid_string;
66  for (size_t i = 0; i < sizeof(bt_uuid_t); ++i, s += 2) {
67    char buf[3] = {0};
68    buf[0] = s[0];
69    buf[1] = s[1];
70    uuid->uu[i] = strtoul(buf, NULL, 16);
71    // Adjust by skipping the dashes
72    switch (i) {
73      case 3:
74      case 5:
75      case 7:
76      case 9:
77        s++;
78        break;
79    }
80  }
81  return uuid;
82}
83
84void uuid_free(bt_uuid_t* uuid) { osi_free(uuid); }
85
86bool uuid_is_empty(const bt_uuid_t* uuid) {
87  return !uuid || !memcmp(uuid, &empty_uuid, sizeof(bt_uuid_t));
88}
89
90bool uuid_is_equal(const bt_uuid_t* first, const bt_uuid_t* second) {
91  CHECK(first != NULL);
92  CHECK(second != NULL);
93  return !memcmp(first, second, sizeof(bt_uuid_t));
94}
95
96bt_uuid_t* uuid_copy(bt_uuid_t* dest, const bt_uuid_t* src) {
97  CHECK(dest != NULL);
98  CHECK(src != NULL);
99  return (bt_uuid_t*)memcpy(dest, src, sizeof(bt_uuid_t));
100}
101
102bool uuid_128_to_16(const bt_uuid_t* uuid, uint16_t* uuid16) {
103  CHECK(uuid != NULL);
104  CHECK(uuid16 != NULL);
105
106  if (!uuid_is_base(uuid)) return false;
107
108  *uuid16 = (uuid->uu[2] << 8) + uuid->uu[3];
109  return true;
110}
111
112bool uuid_128_to_32(const bt_uuid_t* uuid, uint32_t* uuid32) {
113  CHECK(uuid != NULL);
114  CHECK(uuid32 != NULL);
115
116  if (!uuid_is_base(uuid)) return false;
117
118  *uuid32 = (uuid->uu[0] << 24) + (uuid->uu[1] << 16) + (uuid->uu[2] << 8) +
119            uuid->uu[3];
120  return true;
121}
122
123void uuid_to_string(const bt_uuid_t* uuid, uuid_string_t* uuid_string) {
124  CHECK(uuid != NULL);
125  CHECK(uuid_string != NULL);
126
127  char* string = uuid_string->string;
128  char* end = string + UUID_WELL_FORMED_STRING_LEN_WITH_NULL;
129
130  // XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXX
131  for (int i = 0; i < 4; i++) {
132    string += snprintf(string, end - string, "%02x", uuid->uu[i]);
133  }
134  *string = '-';
135  ++string;
136  for (int i = 4; i < 6; i++) {
137    string += snprintf(string, end - string, "%02x", uuid->uu[i]);
138  }
139  *string = '-';
140  ++string;
141  for (int i = 6; i < 8; i++) {
142    string += snprintf(string, end - string, "%02x", uuid->uu[i]);
143  }
144  *string = '-';
145  ++string;
146  for (int i = 8; i < 10; i++) {
147    string += snprintf(string, end - string, "%02x", uuid->uu[i]);
148  }
149  *string = '-';
150  ++string;
151  for (int i = 10; i < 16; i++) {
152    string += snprintf(string, end - string, "%02x", uuid->uu[i]);
153  }
154}
155
156static bool uuid_is_base(const bt_uuid_t* uuid) {
157  if (!uuid) return false;
158
159  for (int i = 4; i < 16; i++) {
160    if (uuid->uu[i] != base_uuid.uu[i]) return false;
161  }
162  return true;
163}
164