| /* |
| * Copyright (C) 2018 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. |
| */ |
| |
| package android.net.util; |
| |
| import static java.lang.Math.max; |
| |
| import android.os.Handler; |
| import android.system.Os; |
| |
| import java.io.FileDescriptor; |
| |
| /** |
| * Specialization of {@link FdEventsReader} that reads packets into a byte array. |
| * |
| * TODO: rename this class to something more correctly descriptive (something |
| * like [or less horrible than] FdReadEventsHandler?). |
| * |
| * @hide |
| */ |
| public abstract class PacketReader extends FdEventsReader<byte[]> { |
| |
| public static final int DEFAULT_RECV_BUF_SIZE = 2 * 1024; |
| |
| protected PacketReader(Handler h) { |
| this(h, DEFAULT_RECV_BUF_SIZE); |
| } |
| |
| protected PacketReader(Handler h, int recvBufSize) { |
| super(h, new byte[max(recvBufSize, DEFAULT_RECV_BUF_SIZE)]); |
| } |
| |
| @Override |
| protected final int recvBufSize(byte[] buffer) { |
| return buffer.length; |
| } |
| |
| /** |
| * Subclasses MAY override this to change the default read() implementation |
| * in favour of, say, recvfrom(). |
| * |
| * Implementations MUST return the bytes read or throw an Exception. |
| */ |
| @Override |
| protected int readPacket(FileDescriptor fd, byte[] packetBuffer) throws Exception { |
| return Os.read(fd, packetBuffer, 0, packetBuffer.length); |
| } |
| } |