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/*
 * Copyright (C) 2006-2010 Alfresco Software Limited.
 *
 * This file is part of Alfresco
 *
 * Alfresco is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Alfresco 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Alfresco. If not, see .
 */

package org.filesys.server.auth.asn;

import java.io.IOException;

/**
 * DER Application Specific Class
 *
 * @author gkspencer
 */
public class DERApplicationSpecific extends DERObject {

    // Application specific blob bytes
    private byte[] m_bytes;

    /**
     * Default constructor
     */
    public DERApplicationSpecific() {
    }

    /**
     * Class constructor
     *
     * @param byts byte[]
     */
    public DERApplicationSpecific(byte[] byts) {
        m_bytes = byts;
    }

    /**
     * Class constructor
     *
     * @param tagId int
     * @param byts  byte[]
     */
    public DERApplicationSpecific(int tagId, byte[] byts) {
        setTagNo(tagId);
        m_bytes = byts;
    }

    /**
     * Return the bytes
     *
     * @return byte[]
     */
    public byte[] getValue() {
        return m_bytes;
    }

    /**
     * DER decode the object
     *
     * @param buf DERBuffer
     */
    public void derDecode(DERBuffer buf)
            throws IOException {

        // Decode the type
        if ((buf.unpackType() & DER.Application) != 0) {

            // Unpack the length and bytes
            int len = buf.unpackLength();
            if (len > 0) {

                // Get the string bytes
                m_bytes = buf.unpackBytes(len);
            } else
                m_bytes = null;
        } else
            throw new IOException("Wrong DER type, expected ApplicationSpecific");
    }

    /**
     * DER encode the object
     *
     * @param buf DERBuffer
     */
    public void derEncode(DERBuffer buf)
            throws IOException {

        // Pack the type, length and bytes
        int tagNo = 0;
        if (isTagged())
            tagNo = getTagNo();

        buf.packByte(DER.Application + DER.Constructed + (tagNo & 0xFF));

        if (m_bytes != null) {
            buf.packLength(m_bytes.length);
            buf.packBytes(m_bytes, 0, m_bytes.length);
        } else
            buf.packLength(0);
    }

    /**
     * Return the string details as a string
     *
     * @return String
     */
    public String toString() {
        StringBuffer str = new StringBuffer();

        str.append("[ApplicationSpecific:");
        str.append(m_bytes != null ? m_bytes.length : 0);
        str.append("]");

        return str.toString();
    }
}