1 /*
2  * Copyright (C) 2022 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 CHRE_UTIL_PIGWEED_PERMISSION_H_
18 #define CHRE_UTIL_PIGWEED_PERMISSION_H_
19 
20 #include <cstdint>
21 #include <optional>
22 
23 #include "chre/util/nanoapp/assert.h"
24 #include "chre/util/non_copyable.h"
25 #include "chre/util/optional.h"
26 #include "chre_api/chre.h"
27 
28 namespace chre {
29 
30 /**
31  * Holds the permission for the next message sent by a server.
32  */
33 class RpcPermission : public NonCopyable {
34  public:
set(uint32_t permission)35   void set(uint32_t permission) {
36     mPermission = permission;
37   }
38 
getAndReset()39   uint32_t getAndReset() {
40     CHRE_ASSERT(mPermission.has_value());
41     uint32_t permission = mPermission.has_value()
42                               ? mPermission.value()
43                               : CHRE_MESSAGE_PERMISSION_NONE;
44     mPermission.reset();
45     return permission;
46   }
47 
48  private:
49   /** Bitmasked CHRE_MESSAGE_PERMISSION_ */
50   Optional<uint32_t> mPermission;
51 };
52 
53 }  // namespace chre
54 
55 #endif  // CHRE_UTIL_PIGWEED_PERMISSION_H_