hashing/include/hidl-hash/Hash.h

/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include <string>
#include <vector>

namespace android {

struct Hash {
    static const std::vector<uint8_t> kEmptyHash;

    // path to .hal file
    static const Hash& getHash(const std::string& path);
    static void clearHash(const std::string& path);

    // returns matching hashes of interfaceName in path
    // path is something like hardware/interfaces/current.txt
    // interfaceName is something like android.hardware.foo@1.0::IFoo
    static std::vector<std::string> lookupHash(const std::string& path,
                                               const std::string& interfaceName, std::string* err,
                                               bool* fileExists = nullptr);

    static std::string hexString(const std::vector<uint8_t>& hash);
    std::string hexString() const;

    const std::vector<uint8_t>& raw() const;
    const std::string& getPath() const;

   private:
    Hash(const std::string& path);

    static Hash& getMutableHash(const std::string& path);

    const std::string mPath;
    std::vector<uint8_t> mHash;
};

}  // namespace android