1 /*
2  * Copyright 2019 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 <cstdint>
20 
21 namespace bluetooth {
22 namespace l2cap {
23 
24 using Psm = uint16_t;
25 constexpr Psm kDefaultPsm = 0;  // Invalid Psm as a default value
26 
IsPsmValid(Psm psm)27 constexpr bool IsPsmValid(Psm psm) {
28   // See Core spec 5.1 Vol 3 Part A 4.2 for definition
29   return (psm & 0x0101u) == 0x0001u;
30 }
31 
32 }  // namespace l2cap
33 }  // namespace bluetooth
34