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
17package android.net.netlink;
18
19import android.net.netlink.NetlinkConstants;
20import android.net.netlink.StructNlMsgHdr;
21import libcore.io.SizeOf;
22
23import java.nio.ByteBuffer;
24
25
26/**
27 * struct nlmsgerr
28 *
29 * see <linux_src>/include/uapi/linux/netlink.h
30 *
31 * @hide
32 */
33public class StructNlMsgErr {
34    public static final int STRUCT_SIZE = SizeOf.INT + StructNlMsgHdr.STRUCT_SIZE;
35
36    public static boolean hasAvailableSpace(ByteBuffer byteBuffer) {
37        return byteBuffer != null && byteBuffer.remaining() >= STRUCT_SIZE;
38    }
39
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
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
66    public String toString() {
67        return "StructNlMsgErr{ "
68                + "error{" + error + "}, "
69                + "msg{" + (msg == null ? "" : msg.toString()) + "} "
70                + "}";
71    }
72}
73