1 /*
2 * Copyright (C) 2024 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "uuid.h"
17
18 #define CONSTANT_ZERO 0
19 #define CONSTANT_FOUR 4
20 #define CONSTANT_EIGHT 8
21 #define CONSTANT_TWELVE 12
22 #define CONSTANT_SIXTEEN 16
23 #define CONSTANT_TWENTY 20
24
25 namespace OHOS {
26 namespace Bluetooth {
27 const std::regex uuidRegex("^[0-9a-fA-F]{8}-([0-9a-fA-F]{4}-){3}[0-9a-fA-F]{12}$");
28
UUID(const long mostSigBits,const long leastSigBits)29 UUID::UUID(const long mostSigBits, const long leastSigBits)
30 {
31 this->uuid_[15] = static_cast<uint8_t>(leastSigBits & 0x00000000000000FF); // 15是uuid的数组下标
32 this->uuid_[14] = static_cast<uint8_t>((leastSigBits & 0x000000000000FF00) >> 8); // 14是uuid的数组下标，右移8位
33 // 13是uuid的数组下标，右移16位
34 this->uuid_[13] = static_cast<uint8_t>((leastSigBits & 0x0000000000FF0000) >> 16);
35 // 12是uuid的数组下标，右移24位
36 this->uuid_[12] = static_cast<uint8_t>((leastSigBits & 0x00000000FF000000) >> 24);
37 // 11是uuid的数组下标，右移32位
38 this->uuid_[11] = static_cast<uint8_t>((leastSigBits & 0x000000FF00000000) >> 32);
39 // 10是uuid的数组下标，右移40位
40 this->uuid_[10] = static_cast<uint8_t>((leastSigBits & 0x0000FF0000000000) >> 40);
41 this->uuid_[9] = static_cast<uint8_t>((leastSigBits & 0x00FF000000000000) >> 48); // 9是uuid的数组下标，右移48位
42 this->uuid_[8] = static_cast<uint8_t>((leastSigBits & 0xFF00000000000000) >> 56); // 8是uuid的数组下标，右移56位
43 this->uuid_[7] = static_cast<uint8_t>(mostSigBits & 0x00000000000000FF); // 7是uuid的数组下标，右移8位
44 this->uuid_[6] = static_cast<uint8_t>((mostSigBits & 0x000000000000FF00) >> 8); // 6是uuid的数组下标，右移8位
45 this->uuid_[5] = static_cast<uint8_t>((mostSigBits & 0x0000000000FF0000) >> 16); // 5是uuid的数组下标，右移16位
46 this->uuid_[4] = static_cast<uint8_t>((mostSigBits & 0x00000000FF000000) >> 24); // 4是uuid的数组下标，右移24位
47 this->uuid_[3] = static_cast<uint8_t>((mostSigBits & 0x000000FF00000000) >> 32); // 3是uuid的数组下标，右移32位
48 this->uuid_[2] = static_cast<uint8_t>((mostSigBits & 0x0000FF0000000000) >> 40); // 2是uuid的数组下标，右移40位
49 this->uuid_[1] = static_cast<uint8_t>((mostSigBits & 0x00FF000000000000) >> 48); // 1是uuid的数组下标，右移48位
50 this->uuid_[0] = static_cast<uint8_t>((mostSigBits & 0xFF00000000000000) >> 56); // 0是uuid的数组下标，右移56位
51 }
52
FromString(const std::string & name)53 UUID UUID::FromString(const std::string &name)
54 {
55 UUID ret;
56 std::string tmp = name;
57 std::size_t pos = tmp.find("-");
58
59 while (pos != std::string::npos) {
60 tmp.replace(pos, 1, "");
61 pos = tmp.find("-");
62 }
63
64 for (std::size_t i = 0; (i + 1) < tmp.length();) {
65 ret.uuid_[i / 2] = std::stoi(tmp.substr(i, 2), nullptr, 16); // uuid的长度为16，i / 2作为uuid的数组下标
66 i += 2; // for 循环中，每轮增加2
67 }
68
69 return ret;
70 }
71
RandomUUID()72 UUID UUID::RandomUUID()
73 {
74 UUID random;
75
76 struct timeval tv;
77 struct timezone tz;
78 struct tm randomTime;
79 unsigned int randNum = 0;
80
81 rand_r(&randNum);
82 gettimeofday(&tv, &tz);
83 localtime_r(&tv.tv_sec, &randomTime);
84 random.uuid_[15] = static_cast<uint8_t>(tv.tv_usec & 0x00000000000000FF); // 15是uuid的数组下标
85 random.uuid_[14] = static_cast<uint8_t>((tv.tv_usec & 0x000000000000FF00) >> 8); // 14是uuid的数组下标，右移8位
86 random.uuid_[13] = static_cast<uint8_t>((tv.tv_usec & 0x0000000000FF0000) >> 16); // 13是uuid的数组下标，右移16位
87 random.uuid_[12] = static_cast<uint8_t>((tv.tv_usec & 0x00000000FF000000) >> 24); // 12是uuid的数组下标，右移24位
88 random.uuid_[10] = static_cast<uint8_t>((tv.tv_usec & 0x000000FF00000000) >> 32); // 10是uuid的数组下标，右移32位
89 random.uuid_[9] = static_cast<uint8_t>((tv.tv_usec & 0x0000FF0000000000) >> 40); // 9是uuid的数组下标，右移40位
90 random.uuid_[8] = static_cast<uint8_t>((tv.tv_usec & 0x00FF000000000000) >> 48); // 8是uuid的数组下标，右移48位
91 random.uuid_[7] = static_cast<uint8_t>((tv.tv_usec & 0xFF00000000000000) >> 56); // 7是uuid的数组下标，右移56位
92 // 6是uuid的数组下标
93 random.uuid_[6] = static_cast<uint8_t>((randomTime.tm_sec + static_cast<int>(randNum)) & 0xFF);
94 // 5是uuid的数组下标，右移8位
95 random.uuid_[5] = static_cast<uint8_t>((randomTime.tm_min + (randNum >> 8)) & 0xFF);
96 // 4是uuid的数组下标，右移16位
97 random.uuid_[4] = static_cast<uint8_t>((randomTime.tm_hour + (randNum >> 16)) & 0xFF);
98 // 3是uuid的数组下标，右移24位
99 random.uuid_[3] = static_cast<uint8_t>((randomTime.tm_mday + (randNum >> 24)) & 0xFF);
100 random.uuid_[2] = static_cast<uint8_t>(randomTime.tm_mon & 0xFF); // 2是uuid的数组下标
101 random.uuid_[1] = static_cast<uint8_t>(randomTime.tm_year & 0xFF); // 1是uuid的数组下标
102 random.uuid_[0] = static_cast<uint8_t>((randomTime.tm_year & 0xFF00) >> 8); // 0是uuid的数组下标，右移8位
103 return random;
104 }
105
ToString() const106 std::string UUID::ToString() const
107 {
108 std::string tmp = "";
109 std::string ret = "";
110 static const char *hex = "0123456789ABCDEF";
111
112 for (auto it = this->uuid_.begin(); it != this->uuid_.end(); it++) {
113 tmp.push_back(hex[(((*it) >> 4) & 0xF)]); // 右移4位
114 tmp.push_back(hex[(*it) & 0xF]);
115 }
116 // ToString操作，8， 4， 12， 16，20 作为截取字符的开始位置或截取长度
117 ret = tmp.substr(CONSTANT_ZERO, CONSTANT_EIGHT) + "-" +
118 tmp.substr(CONSTANT_EIGHT, CONSTANT_FOUR) + "-" +
119 tmp.substr(CONSTANT_TWELVE, CONSTANT_FOUR) + "-" +
120 tmp.substr(CONSTANT_SIXTEEN, CONSTANT_FOUR) + "-" +
121 tmp.substr(CONSTANT_TWENTY);
122
123 return ret;
124 }
125
CompareTo(const UUID & val) const126 int UUID::CompareTo(const UUID &val) const
127 {
128 UUID tmp = val;
129 return this->ToString().compare(tmp.ToString());
130 }
131
Equals(const UUID & val) const132 bool UUID::Equals(const UUID &val) const
133 {
134 for (int i = 0; i < UUID::UUID128_BYTES_LEN; i++) {
135 if (this->uuid_[i] != val.uuid_[i]) {
136 return false;
137 }
138 }
139 return true;
140 }
141
GetLeastSignificantBits() const142 uint64_t UUID::GetLeastSignificantBits() const
143 {
144 uint64_t leastSigBits = 0;
145 for (int i = UUID::UUID128_BYTES_LEN / 2; i < UUID::UUID128_BYTES_LEN; i++) { // uuid长度/2作为i初始值
146 leastSigBits = (leastSigBits << 8) | (uuid_[i] & 0xFF); // 左移8位
147 }
148 return leastSigBits;
149 }
150
GetMostSignificantBits() const151 uint64_t UUID::GetMostSignificantBits() const
152 {
153 uint64_t mostSigBits = 0;
154 for (int i = 0 / 2; i < UUID::UUID128_BYTES_LEN / 2; i++) { // uuid长度/2作为i最大值
155 mostSigBits = (mostSigBits << 8) | (uuid_[i] & 0xFF); // 左移8位
156 }
157 return mostSigBits;
158 }
159
ConvertFrom128Bits(const std::array<uint8_t,UUID::UUID128_BYTES_LEN> & name)160 UUID UUID::ConvertFrom128Bits(const std::array<uint8_t, UUID::UUID128_BYTES_LEN> &name)
161 {
162 UUID tmp;
163 for (int i = 0; i < UUID::UUID128_BYTES_LEN; i++) {
164 tmp.uuid_[i] = name[i];
165 }
166 return tmp;
167 }
168
ConvertTo128Bits() const169 std::array<uint8_t, UUID::UUID128_BYTES_LEN> UUID::ConvertTo128Bits() const
170 {
171 std::array<uint8_t, UUID::UUID128_BYTES_LEN> uuid;
172
173 for (int i = 0; i < UUID::UUID128_BYTES_LEN; i++) {
174 uuid[i] = uuid_[i];
175 }
176
177 return uuid;
178 }
179
operator ==(const UUID & rhs) const180 bool UUID::operator==(const UUID &rhs) const
181 {
182 return uuid_ == rhs.uuid_;
183 }
184
operator <(const UUID & uuid) const185 bool UUID::operator<(const UUID &uuid) const
186 {
187 return !Equals(uuid);
188 }
189
IsValidUuid(std::string uuid)190 bool IsValidUuid(std::string uuid)
191 {
192 return regex_match(uuid, uuidRegex);
193 }
194 }
195 }