1 /******************************************************************************
2 *
3 * Copyright 2019 The Android Open Source Project
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 "hci/class_of_device.h"
20
21 #include <algorithm>
22 #include <cstdint>
23 #include <cstdio>
24 #include <cstdlib>
25 #include <sstream>
26 #include <vector>
27
28 namespace bluetooth {
29 namespace hci {
30
31 // ClassOfDevice cannot initialize member variables as it is a POD type
32 // NOLINTNEXTLINE(cppcoreguidelines-pro-type-member-init)
ClassOfDevice(const uint8_t (& class_of_device)[kLength])33 ClassOfDevice::ClassOfDevice(const uint8_t (&class_of_device)[kLength]) {
34 std::copy(class_of_device, class_of_device + kLength, cod.data());
35 };
36
ToString() const37 std::string ClassOfDevice::ToString() const {
38 char buffer[] = "000-0-00";
39 std::snprintf(&buffer[0], sizeof(buffer), "%03x-%01x-%02x",
40 (static_cast<uint16_t>(cod[2]) << 4) | cod[1] >> 4,
41 cod[1] & 0x0f, cod[0]);
42 std::string str(buffer);
43 return str;
44 }
45
ToLegacyConfigString() const46 std::string ClassOfDevice::ToLegacyConfigString() const {
47 return std::to_string(ToUint32Legacy());
48 }
49
FromString(const std::string & str)50 std::optional<ClassOfDevice> ClassOfDevice::FromString(const std::string& str) {
51 if (str.length() != 8) {
52 return std::nullopt;
53 }
54
55 std::istringstream stream(str);
56 std::string token;
57 int index = 0;
58 uint16_t values[3];
59
60 ClassOfDevice new_cod{};
61 while (getline(stream, token, '-')) {
62 if (index >= 3) {
63 return std::nullopt;
64 }
65
66 if (index == 0 && token.length() != 3) {
67 return std::nullopt;
68 } else if (index == 1 && token.length() != 1) {
69 return std::nullopt;
70 } else if (index == 2 && token.length() != 2) {
71 return std::nullopt;
72 }
73 char* temp = nullptr;
74 values[index] = std::strtol(token.c_str(), &temp, 16);
75 if (*temp != '\0') {
76 return std::nullopt;
77 }
78
79 index++;
80 }
81
82 if (index != 3) {
83 return std::nullopt;
84 }
85
86 new_cod.cod[0] = values[2];
87 new_cod.cod[1] = values[1] | ((values[0] & 0xf) << 4);
88 new_cod.cod[2] = values[0] >> 4;
89
90 return new_cod;
91 }
92
FromString(const std::string & from,ClassOfDevice & to)93 bool ClassOfDevice::FromString(const std::string& from, ClassOfDevice& to) {
94 auto new_cod = FromString(from);
95 if (!new_cod) {
96 to = {};
97 return false;
98 }
99 to = std::move(*new_cod);
100 return true;
101 }
102
FromUint32Legacy(uint32_t cod_int)103 std::optional<ClassOfDevice> ClassOfDevice::FromUint32Legacy(uint32_t cod_int) {
104 if (cod_int != 0 && (cod_int >> 24) != 0) {
105 return std::nullopt;
106 }
107 ClassOfDevice result = {};
108 result.cod[2] = static_cast<uint8_t>(cod_int);
109 result.cod[1] = static_cast<uint8_t>(cod_int >> 8);
110 result.cod[0] = static_cast<uint8_t>(cod_int >> 16);
111 return result;
112 }
113
FromLegacyConfigString(const std::string & str)114 std::optional<ClassOfDevice> ClassOfDevice::FromLegacyConfigString(
115 const std::string& str) {
116 char* ptr = nullptr;
117 auto num = std::strtoull(str.data(), &ptr, 10);
118 if (num > 0xffffff) {
119 return std::nullopt;
120 }
121 return FromUint32Legacy(static_cast<uint32_t>(num));
122 }
123
ToUint32Legacy() const124 uint32_t ClassOfDevice::ToUint32Legacy() const {
125 return (cod[2]) | (cod[1] << 8) | (cod[0] << 16);
126 }
127
FromOctets(const uint8_t * from)128 size_t ClassOfDevice::FromOctets(const uint8_t* from) {
129 std::copy(from, from + kLength, data());
130 return kLength;
131 };
132
IsValid(const std::string & cod)133 bool ClassOfDevice::IsValid(const std::string& cod) {
134 return ClassOfDevice::FromString(cod).has_value();
135 }
136 } // namespace hci
137 } // namespace bluetooth
138