io.netlibs.bgp.protocol.NLRICodec.java Source code

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Here is the source code for io.netlibs.bgp.protocol.NLRICodec.java

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/**
 *  Copyright 2012 Rainer Bieniek (Rainer.Bieniek@web.de)
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 * File: org.bgp4j.netty.NLRICodec.java
 */
package io.netlibs.bgp.protocol;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;

/**
 * @author Rainer Bieniek (Rainer.Bieniek@web.de)
 *
 */

public class NLRICodec {

    /**
     *
     */

    public static NetworkLayerReachabilityInformation decodeNLRI(final ByteBuf buffer) {

        final NetworkLayerReachabilityInformation nlri = new NetworkLayerReachabilityInformation();
        final int prefixLength = buffer.readUnsignedByte();
        byte[] prefixBytes = null;

        if (prefixLength > 0) {
            prefixBytes = new byte[NetworkLayerReachabilityInformation
                    .calculateOctetsForPrefixLength(prefixLength)];
            buffer.readBytes(prefixBytes);
        }

        nlri.setPrefix(prefixLength, prefixBytes);

        return nlri;

    }

    /**
     *
     */

    public static int calculateEncodedNLRILength(final NetworkLayerReachabilityInformation nlri) {
        return NetworkLayerReachabilityInformation.calculateOctetsForPrefixLength(nlri.getPrefixLength()) + 1;
    }

    /**
     * @param nlri
     * @return
     */

    public static ByteBuf encodeNLRI(final NetworkLayerReachabilityInformation nlri) {

        final ByteBuf buffer = Unpooled.buffer(calculateEncodedNLRILength(nlri));

        buffer.writeByte(nlri.getPrefixLength());

        if (nlri.getPrefixLength() > 0) {
            buffer.writeBytes(nlri.getPrefix());
        }

        return buffer;

    }

}