/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

/*
 *  (C) Copyright IBM Corp. 1999 All Rights Reserved.
 *  Copyright 1997 The Open Group Research Institute.  All rights reserved.
 */

package sun.security.krb5.internal;

import sun.security.util.*;
import java.io.IOException;
import sun.security.krb5.Asn1Exception;
import sun.security.krb5.internal.ccache.CCacheOutputStream;

public class AuthorizationDataEntry implements Cloneable {
        public int adType;
        public byte[] adData;

        private AuthorizationDataEntry() {
        }

        public AuthorizationDataEntry(
                int new_adType,
                byte[] new_adData
        ) {
                adType = new_adType;
                adData = new_adData;
        }

        public Object clone() {
                AuthorizationDataEntry new_authorizationDataEntry =
                        new AuthorizationDataEntry();
                new_authorizationDataEntry.adType = adType;
                if (adData != null) {
                        new_authorizationDataEntry.adData = new byte[adData.length];
                        System.arraycopy(adData, 0,
                                new_authorizationDataEntry.adData, 0, adData.length);
                }
                return new_authorizationDataEntry;
        }

        /**
         * Constructs an instance of AuthorizationDataEntry.
         * @param encoding a single DER-encoded value.
         */
        public AuthorizationDataEntry(DerValue encoding) throws Asn1Exception, IOException {
                DerValue der;
        if (encoding.getTag() != DerValue.tag_Sequence) {
            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
                }
                der = encoding.getData().getDerValue();
        if ((der.getTag() & (byte)0x1F) == (byte)0x00) {
                        adType = der.getData().getBigInteger().intValue();
                }
                else
                        throw new Asn1Exception(Krb5.ASN1_BAD_ID);
        der = encoding.getData().getDerValue();
        if ((der.getTag() & (byte)0x1F) == (byte)0x01) {
                        adData = der.getData().getOctetString();
                }
                else
                        throw new Asn1Exception(Krb5.ASN1_BAD_ID);
        if (encoding.getData().available() > 0)
                        throw new Asn1Exception(Krb5.ASN1_BAD_ID);
        }

        /**
         * Encodes an AuthorizationDataEntry object.
         * @return byte array of encoded AuthorizationDataEntry object.
         * @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data.
         * @exception IOException if an I/O error occurs while reading encoded data.
         */
        public byte[] asn1Encode() throws Asn1Exception, IOException {
        DerOutputStream bytes = new DerOutputStream();
                DerOutputStream temp = new DerOutputStream();
                temp.putInteger(adType);
                bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x00), temp);
                temp = new DerOutputStream();
                temp.putOctetString(adData);
                bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x01), temp);
                temp = new DerOutputStream();
                temp.write(DerValue.tag_Sequence, bytes);
                return temp.toByteArray();
        }

        /**
         * Writes the entry's data fields in FCC format to an output stream.
         *
         * @param cos a <code>CCacheOutputStream</code>.
         * @exception IOException if an I/O exception occurs.
         */
        public void writeEntry(CCacheOutputStream cos) throws IOException {
                cos.write16(adType);
                cos.write32(adData.length);
                cos.write(adData, 0, adData.length);
        }

    public String toString() {
        return ("adType=" + adType + " adData.length=" + adData.length);
    }

}
