/*
* 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.kerberos.protocol;
import java.io.IOException;
import org.apache.directory.server.kerberos.shared.io.encoder.ErrorMessageEncoder;
import org.apache.directory.server.kerberos.shared.io.encoder.KdcReplyEncoder;
import org.apache.directory.server.kerberos.shared.messages.ErrorMessage;
import org.apache.directory.server.kerberos.shared.messages.KdcReply;
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;
/**
* @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
* @version $Rev$, $Date$
*/
public class KerberosTcpEncoder extends ProtocolEncoderAdapter
{
private KdcReplyEncoder replyEncoder = new KdcReplyEncoder();
private ErrorMessageEncoder errorEncoder = new ErrorMessageEncoder();
public void encode( IoSession session, Object message, ProtocolEncoderOutput out ) throws IOException
{
IoBuffer buf = IoBuffer.allocate( 1024 );
// make space for int length
buf.putInt( 0 );
if ( message instanceof KdcReply )
{
replyEncoder.encode( ( KdcReply ) message, buf.buf() );
}
else
{
if ( message instanceof ErrorMessage )
{
errorEncoder.encode( ( ErrorMessage ) message, buf.buf() );
}
}
// mark position
int pos = buf.position();
// length is the data minus 4 bytes for the pre-pended length
int recordLength = buf.position() - 4;
// write the length
buf.rewind();
buf.putInt( recordLength );
// set the position back before flipping the buffer
buf.position( pos );
buf.flip();
out.write( buf );
}
}