/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*
*/
package org.apache.directory.server.dns.protocol;
import org.apache.directory.server.dns.io.encoder.DnsMessageEncoder;
import org.apache.directory.server.dns.messages.DnsMessage;
import org.apache.mina.core.buffer.IoBuffer;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.filter.codec.ProtocolEncoderAdapter;
import org.apache.mina.filter.codec.ProtocolEncoderOutput;
/**
* A ProtocolEncoder for use in the MINA framework that uses the
* DnsMessageEncoder to encode DnsMessages.
*
* @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
* @version $Rev: 545041 $, $Date: 2007-06-06 20:31:34 -0700 (Wed, 06 Jun 2007) $
*/
public class DnsTcpEncoder extends ProtocolEncoderAdapter
{
private DnsMessageEncoder encoder = new DnsMessageEncoder();
public void encode( IoSession session, Object message, ProtocolEncoderOutput out )
{
IoBuffer buf = IoBuffer.allocate( 1024 );
// make space for short length
buf.putShort( ( short ) 0 );
encoder.encode( buf, ( DnsMessage ) message );
// mark position
int end = buf.position();
// length is the data minus 2 bytes for the pre-pended length
short recordLength = ( short ) ( end - 2 );
// write the length
buf.rewind();
buf.putShort( recordLength );
// set the position back before flipping the buffer
buf.position( end );
buf.flip();
out.write( buf );
}
}