2 * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.protocol.bgp.rib.impl;
10 import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
13 * @see <a href="http://tools.ietf.org/html/rfc4271#section-4.1">BGP Message Header</a>
15 public final class BGPMessageHeaderDecoder extends LengthFieldBasedFrameDecoder {
17 private static final int MAX_FRAME_SIZE = 4096; // min 19, max 4096
19 private static final int MARKER_SIZE = 16;
21 private static final int LENGTH_SIZE = 2; // the length field represents the length of the whole message including
27 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
28 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
36 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
38 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
42 public BGPMessageHeaderDecoder() {
43 super(MAX_FRAME_SIZE, MARKER_SIZE, LENGTH_SIZE, -MARKER_SIZE - LENGTH_SIZE, 0);