1 /*
2  * Copyright (C) 2016 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #pragma once
18 
19 #include <string>
20 #include <vector>
21 
22 namespace android {
23 
24 struct Hash {
25     static const std::vector<uint8_t> kEmptyHash;
26 
27     // path to .hal file
28     static const Hash& getHash(const std::string& path);
29     static void clearHash(const std::string& path);
30 
31     // returns matching hashes of interfaceName in path
32     // path is something like hardware/interfaces/current.txt
33     // interfaceName is something like android.hardware.foo@1.0::IFoo
34     static std::vector<std::string> lookupHash(const std::string& path,
35                                                const std::string& interfaceName, std::string* err,
36                                                bool* fileExists = nullptr);
37 
38     static std::string hexString(const std::vector<uint8_t>& hash);
39     std::string hexString() const;
40 
41     const std::vector<uint8_t>& raw() const;
42     const std::string& getPath() const;
43 
44    private:
45     Hash(const std::string& path);
46 
47     static Hash& getMutableHash(const std::string& path);
48 
49     const std::string mPath;
50     std::vector<uint8_t> mHash;
51 };
52 
53 }  // namespace android
54