
/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
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 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache POI" must not be used to endorse or promote products
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 *
 * 5. Products derived from this software may not be called "Apache",
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 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package org.apache.poi.hssf.record;

import org.apache.poi.util.LittleEndian;

/**
 * Title:        Password Record<P>
 * Description:  stores the encrypted password for a sheet or workbook (HSSF doesn't support encryption)
 * REFERENCE:  PG 371 Microsoft Excel 97 Developer's Kit (ISBN: 1-57231-498-2)<P>
 * @author Andrew C. Oliver (acoliver at apache dot org)
 * @version 2.0-pre
 */

public class PasswordRecord
    extends Record
{
    public final static short sid = 0x13;
    private short             field_1_password;   // not sure why this is only 2 bytes, but it is... go figure

    public PasswordRecord()
    {
    }

    /**
     * Constructs a Password record and sets its fields appropriately.
     *
     * @param id     id must be 0x13 or an exception will be throw upon validation
     * @param size  the size of the data area of the record
     * @param data  data of the record (should not contain sid/len)
     */

    public PasswordRecord(short id, short size, byte [] data)
    {
        super(id, size, data);
    }

    /**
     * Constructs a Password record and sets its fields appropriately.
     *
     * @param id     id must be 0x13 or an exception will be throw upon validation
     * @param size  the size of the data area of the record
     * @param data  data of the record (should not contain sid/len)
     * @param offset of the data
     */

    public PasswordRecord(short id, short size, byte [] data, int offset)
    {
        super(id, size, data, offset);
    }

    protected void validateSid(short id)
    {
        if (id != sid)
        {
            throw new RecordFormatException("NOT A PASSWORD RECORD");
        }
    }

    protected void fillFields(byte [] data, short size, int offset)
    {
        field_1_password = LittleEndian.getShort(data, 0 + offset);
    }

    /**
     * set the password
     *
     * @param password  representing the password
     */

    public void setPassword(short password)
    {
        field_1_password = password;
    }

    /**
     * get the password
     *
     * @return short  representing the password
     */

    public short getPassword()
    {
        return field_1_password;
    }

    public String toString()
    {
        StringBuffer buffer = new StringBuffer();

        buffer.append("[PASSWORD]\n");
        buffer.append("    .password       = ")
            .append(Integer.toHexString(getPassword())).append("\n");
        buffer.append("[/PASSWORD]\n");
        return buffer.toString();
    }

    public int serialize(int offset, byte [] data)
    {
        LittleEndian.putShort(data, 0 + offset, sid);
        LittleEndian.putShort(data, 2 + offset,
                              (( short ) 0x02));   // 2 bytes (6 total)
        LittleEndian.putShort(data, 4 + offset, getPassword());
        return getRecordSize();
    }

    public int getRecordSize()
    {
        return 6;
    }

    public short getSid()
    {
        return this.sid;
    }

    /**
     * Clone this record.
     */
    public Object clone() {
      PasswordRecord clone = new PasswordRecord();
      clone.setPassword(field_1_password);
      return clone;
    }

}