DERUnknownTag.java

/**
 *
 * Copyright 2003-2004 The Apache Software Foundation
 *
 *  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.
 */

package org.apache.geronimo.util.asn1;

import java.io.IOException;

/**
 * We insert one of these when we find a tag we don't recognise.
 */
public class DERUnknownTag
    extends DERObject
{
    int         tag;
    byte[]      data;

    /**
     * @param tag the tag value.
     * @param data the octets making up the time.
     */
    public DERUnknownTag(
        int     tag,
        byte[]  data)
    {
        this.tag = tag;
        this.data = data;
    }

    public int getTag()
    {
        return tag;
    }

    public byte[] getData()
    {
        return data;
    }

    void encode(
        DEROutputStream  out)
        throws IOException
    {
        out.writeEncoded(tag, data);
    }

    public boolean equals(
        Object o)
    {
        if ((o == null) || !(o instanceof DERUnknownTag))
        {
            return false;
        }

        DERUnknownTag other = (DERUnknownTag)o;

        if (tag != other.tag)
        {
            return false;
        }

        if (data.length != other.data.length)
        {
            return false;
        }

        for (int i = 0; i < data.length; i++)
        {
            if(data[i] != other.data[i])
            {
                return false;
            }
        }

        return true;
    }

    public int hashCode()
    {
        byte[]  b = this.getData();
        int     value = 0;

        for (int i = 0; i != b.length; i++)
        {
            value ^= (b[i] & 0xff) << (i % 4);
        }

        return value ^ this.getTag();
    }
}