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)27constexpr 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