1 /*
2  * Copyright (C) 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 package android.net.netlink;
18 
19 import java.nio.ByteBuffer;
20 
21 
22 /**
23  * struct nlmsgerr
24  *
25  * see <linux_src>/include/uapi/linux/netlink.h
26  *
27  * @hide
28  */
29 public class StructNlMsgErr {
30     public static final int STRUCT_SIZE = Integer.BYTES + StructNlMsgHdr.STRUCT_SIZE;
31 
hasAvailableSpace(ByteBuffer byteBuffer)32     public static boolean hasAvailableSpace(ByteBuffer byteBuffer) {
33         return byteBuffer != null && byteBuffer.remaining() >= STRUCT_SIZE;
34     }
35 
parse(ByteBuffer byteBuffer)36     public static StructNlMsgErr parse(ByteBuffer byteBuffer) {
37         if (!hasAvailableSpace(byteBuffer)) { return null; }
38 
39         // The ByteOrder must have already been set by the caller.  In most
40         // cases ByteOrder.nativeOrder() is correct, with the exception
41         // of usage within unittests.
42         final StructNlMsgErr struct = new StructNlMsgErr();
43         struct.error = byteBuffer.getInt();
44         struct.msg = StructNlMsgHdr.parse(byteBuffer);
45         return struct;
46     }
47 
48     public int error;
49     public StructNlMsgHdr msg;
50 
pack(ByteBuffer byteBuffer)51     public void pack(ByteBuffer byteBuffer) {
52         // The ByteOrder must have already been set by the caller.  In most
53         // cases ByteOrder.nativeOrder() is correct, with the possible
54         // exception of usage within unittests.
55         byteBuffer.putInt(error);
56         if (msg != null) {
57             msg.pack(byteBuffer);
58         }
59     }
60 
61     @Override
toString()62     public String toString() {
63         return "StructNlMsgErr{ "
64                 + "error{" + error + "}, "
65                 + "msg{" + (msg == null ? "" : msg.toString()) + "} "
66                 + "}";
67     }
68 }
69