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 #ifndef HIDL_GEN_HASH_HASH_H_
18 #define HIDL_GEN_HASH_HASH_H_
19 
20 #include <string>
21 #include <vector>
22 
23 namespace android {
24 
25 struct Hash {
26     static const std::vector<uint8_t> kEmptyHash;
27 
28     // path to .hal file
29     static const Hash &getHash(const std::string &path);
30     static void clearHash(const std::string& path);
31 
32     // returns matching hashes of interfaceName in path
33     // path is something like hardware/interfaces/current.txt
34     // interfaceName is something like android.hardware.foo@1.0::IFoo
35     static std::vector<std::string> lookupHash(const std::string& path,
36                                                const std::string& interfaceName, std::string* err,
37                                                bool* fileExists = nullptr);
38 
39     static std::string hexString(const std::vector<uint8_t> &hash);
40     std::string hexString() const;
41 
42     const std::vector<uint8_t> &raw() const;
43     const std::string &getPath() const;
44 
45 private:
46     Hash(const std::string &path);
47 
48     static Hash& getMutableHash(const std::string& path);
49 
50     const std::string mPath;
51     std::vector<uint8_t> mHash;
52 };
53 
54 }  // namespace android
55 
56 #endif  // HIDL_GEN_HASH_HASH_H_
57 
58