1 /******************************************************************************
2  *
3  *  Copyright 2017 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 #pragma once
20 
21 #include <cstring>
22 #include <string>
23 
24 /** Bluetooth Address */
25 class RawAddress final {
26  public:
27   static constexpr unsigned int kLength = 6;
28 
29   uint8_t address[kLength];
30 
31   RawAddress() = default;
32   RawAddress(const uint8_t (&addr)[6]);
33 
34   bool operator<(const RawAddress& rhs) const {
35     return (std::memcmp(address, rhs.address, sizeof(address)) < 0);
36   }
37   bool operator==(const RawAddress& rhs) const {
38     return (std::memcmp(address, rhs.address, sizeof(address)) == 0);
39   }
40   bool operator>(const RawAddress& rhs) const { return (rhs < *this); }
41   bool operator<=(const RawAddress& rhs) const { return !(*this > rhs); }
42   bool operator>=(const RawAddress& rhs) const { return !(*this < rhs); }
43   bool operator!=(const RawAddress& rhs) const { return !(*this == rhs); }
44 
45   bool IsEmpty() const { return *this == kEmpty; }
46 
47   std::string ToString() const;
48 
49   // Converts |string| to RawAddress and places it in |to|. If |from| does
50   // not represent a Bluetooth address, |to| is not modified and this function
51   // returns false. Otherwise, it returns true.
52   static bool FromString(const std::string& from, RawAddress& to);
53 
54   // Copies |from| raw Bluetooth address octets to the local object.
55   // Returns the number of copied octets - should be always RawAddress::kLength
56   size_t FromOctets(const uint8_t* from);
57 
58   static bool IsValidAddress(const std::string& address);
59 
60   static const RawAddress kEmpty;  // 00:00:00:00:00:00
61   static const RawAddress kAny;    // FF:FF:FF:FF:FF:FF
62 };
63 
64 inline std::ostream& operator<<(std::ostream& os, const RawAddress& a) {
65   os << a.ToString();
66   return os;
67 }
68 
69 template <>
70 struct std::hash<RawAddress> {
71   std::size_t operator()(const RawAddress& val) const {
72     static_assert(sizeof(uint64_t) >= RawAddress::kLength);
73     uint64_t int_addr = 0;
74     memcpy(reinterpret_cast<uint8_t*>(&int_addr), val.address,
75            RawAddress::kLength);
76     return std::hash<uint64_t>{}(int_addr);
77   }
78 };
79