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