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Apache POI - Java API To Access Microsoft Format Files

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/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You 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.poi.hwpf.model;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import org.apache.poi.hwpf.model.types.DOPAbstractType;
import org.apache.poi.util.IOUtils;
import org.apache.poi.util.Internal;
import org.apache.poi.util.LittleEndian;

/**
 * Comment me
 * 
 * @author Ryan Ackley
 */
@Internal
public final class DocumentProperties extends DOPAbstractType
{

    //arbitrarily selected; may need to increase
    private static final int MAX_RECORD_LENGTH = 100_000;

    private byte[] _preserved;

    /**
     * @deprecated Use {@link #DocumentProperties(byte[],int,int)} instead
     */
    public DocumentProperties( byte[] tableStream, int offset )
    {
        this( tableStream, offset, DOPAbstractType.getSize() );
    }

    public DocumentProperties( byte[] tableStream, int offset, int length )
    {
        super.fillFields( tableStream, offset );

        final int supportedSize = DOPAbstractType.getSize();
        if ( length != supportedSize )
        {
            this._preserved = LittleEndian.getByteArray( tableStream, offset
                    + supportedSize, length - supportedSize, MAX_RECORD_LENGTH );
        }
        else
        {
            _preserved = new byte[0];
        }
    }

    @Override
    public void serialize( byte[] data, int offset )
    {
        super.serialize( data, offset );
    }

    public void writeTo( ByteArrayOutputStream tableStream ) throws IOException
    {
        byte[] supported = new byte[getSize()];
        serialize( supported, 0 );

        tableStream.write( supported );
        tableStream.write( _preserved );
    }
}