1 /* 2 * Copyright (C) 2015 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 TRANSPORT_H_ 18 #define TRANSPORT_H_ 19 20 #include <android-base/macros.h> 21 22 // General interface to allow the fastboot protocol to be used over different 23 // types of transports. 24 class Transport { 25 public: 26 Transport() = default; 27 virtual ~Transport() = default; 28 29 // Reads |len| bytes into |data|. Returns the number of bytes actually 30 // read or -1 on error. 31 virtual ssize_t Read(void* data, size_t len) = 0; 32 33 // Writes |len| bytes from |data|. Returns the number of bytes actually 34 // written or -1 on error. 35 virtual ssize_t Write(const void* data, size_t len) = 0; 36 37 // Closes the underlying transport. Returns 0 on success. 38 virtual int Close() = 0; 39 40 // Blocks until the transport disconnects. Transports that don't support 41 // this will return immediately. Returns 0 on success. WaitForDisconnect()42 virtual int WaitForDisconnect() { return 0; } 43 44 private: 45 DISALLOW_COPY_AND_ASSIGN(Transport); 46 }; 47 48 #endif // TRANSPORT_H_ 49