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 package android.net.netlink; 18 19 import android.net.netlink.NetlinkConstants; 20 import android.net.netlink.StructNlMsgHdr; 21 import libcore.io.SizeOf; 22 23 import java.nio.ByteBuffer; 24 25 26 /** 27 * struct nlmsgerr 28 * 29 * see <linux_src>/include/uapi/linux/netlink.h 30 * 31 * @hide 32 */ 33 public class StructNlMsgErr { 34 public static final int STRUCT_SIZE = SizeOf.INT + StructNlMsgHdr.STRUCT_SIZE; 35 hasAvailableSpace(ByteBuffer byteBuffer)36 public static boolean hasAvailableSpace(ByteBuffer byteBuffer) { 37 return byteBuffer != null && byteBuffer.remaining() >= STRUCT_SIZE; 38 } 39 parse(ByteBuffer byteBuffer)40 public static StructNlMsgErr parse(ByteBuffer byteBuffer) { 41 if (!hasAvailableSpace(byteBuffer)) { return null; } 42 43 // The ByteOrder must have already been set by the caller. In most 44 // cases ByteOrder.nativeOrder() is correct, with the exception 45 // of usage within unittests. 46 final StructNlMsgErr struct = new StructNlMsgErr(); 47 struct.error = byteBuffer.getInt(); 48 struct.msg = StructNlMsgHdr.parse(byteBuffer); 49 return struct; 50 } 51 52 public int error; 53 public StructNlMsgHdr msg; 54 pack(ByteBuffer byteBuffer)55 public void pack(ByteBuffer byteBuffer) { 56 // The ByteOrder must have already been set by the caller. In most 57 // cases ByteOrder.nativeOrder() is correct, with the possible 58 // exception of usage within unittests. 59 byteBuffer.putInt(error); 60 if (msg != null) { 61 msg.pack(byteBuffer); 62 } 63 } 64 65 @Override toString()66 public String toString() { 67 return "StructNlMsgErr{ " 68 + "error{" + error + "}, " 69 + "msg{" + (msg == null ? "" : msg.toString()) + "} " 70 + "}"; 71 } 72 } 73