001    /*
002     *  Licensed to the Apache Software Foundation (ASF) under one
003     *  or more contributor license agreements.  See the NOTICE file
004     *  distributed with this work for additional information
005     *  regarding copyright ownership.  The ASF licenses this file
006     *  to you under the Apache License, Version 2.0 (the
007     *  "License"); you may not use this file except in compliance
008     *  with the License.  You may obtain a copy of the License at
009     *  
010     *    http://www.apache.org/licenses/LICENSE-2.0
011     *  
012     *  Unless required by applicable law or agreed to in writing,
013     *  software distributed under the License is distributed on an
014     *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015     *  KIND, either express or implied.  See the License for the
016     *  specific language governing permissions and limitations
017     *  under the License. 
018     *  
019     */
020    package org.apache.directory.server.kerberos.shared.io.decoder;
021    
022    
023    import java.util.Enumeration;
024    
025    import org.apache.directory.server.kerberos.shared.messages.value.HostAddress;
026    import org.apache.directory.server.kerberos.shared.messages.value.types.HostAddrType;
027    import org.apache.directory.server.kerberos.shared.messages.value.HostAddresses;
028    import org.apache.directory.shared.asn1.der.DEREncodable;
029    import org.apache.directory.shared.asn1.der.DERInteger;
030    import org.apache.directory.shared.asn1.der.DEROctetString;
031    import org.apache.directory.shared.asn1.der.DERSequence;
032    import org.apache.directory.shared.asn1.der.DERTaggedObject;
033    
034    
035    /**
036     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
037     * @version $Rev: 587242 $, $Date: 2007-10-22 22:42:40 +0200 (Mon, 22 Oct 2007) $
038     */
039    public class HostAddressDecoder
040    {
041        /**
042         * HostAddress ::=     SEQUENCE  {
043         *                     addr-type[0]             INTEGER,
044         *                     address[1]               OCTET STRING
045         * }
046         */
047        protected static HostAddress decode( DERSequence sequence )
048        {
049            HostAddrType type = HostAddrType.ADDRTYPE_INET;
050            byte[] value = null;
051    
052            for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
053            {
054                DERTaggedObject object = ( DERTaggedObject ) e.nextElement();
055                int tag = object.getTagNo();
056                DEREncodable derObject = object.getObject();
057    
058                switch ( tag )
059                {
060                    case 0:
061                        DERInteger addressType = ( DERInteger ) derObject;
062                        type = HostAddrType.getTypeByOrdinal( addressType.intValue() );
063                        break;
064                        
065                    case 1:
066                        DEROctetString address = ( DEROctetString ) derObject;
067                        value = address.getOctets();
068                        break;
069                }
070            }
071    
072            return new HostAddress( type, value );
073        }
074    
075    
076        /**
077         * HostAddresses ::=   SEQUENCE OF SEQUENCE {
078         *                     addr-type[0]             INTEGER,
079         *                     address[1]               OCTET STRING
080         * }
081         */
082        protected static HostAddresses decodeSequence( DERSequence sequence )
083        {
084            HostAddress[] addresses = new HostAddress[sequence.size()];
085    
086            int ii = 0;
087            
088            for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
089            {
090                DERSequence object = ( DERSequence ) e.nextElement();
091                HostAddress address = decode( object );
092                addresses[ii] = address;
093                ii++;
094            }
095    
096            return new HostAddresses( addresses );
097        }
098    }