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Apache POI - Java API To Access Microsoft Format Files
There is a newer version: 5.2.5
/* ====================================================================
   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.hssf.record;

import org.apache.poi.ddf.EscherRecord;
import org.apache.poi.ddf.NullEscherSerializationListener;
import org.apache.poi.util.LittleEndian;

import java.util.Iterator;
import java.util.List;


public final class DrawingGroupRecord extends AbstractEscherHolderRecord {
    public static final short sid = 0xEB;

    static final int MAX_RECORD_SIZE = 8228;
    private static final int MAX_DATA_SIZE = MAX_RECORD_SIZE - 4;

    public DrawingGroupRecord()
    {
    }

    public DrawingGroupRecord( RecordInputStream in )
    {
        super( in );
    }

    protected String getRecordName()
    {
        return "MSODRAWINGGROUP";
    }

    public short getSid()
    {
        return sid;
    }

    public int serialize(int offset, byte[] data)
    {
        byte[] rawData = getRawData();
        if (getEscherRecords().size() == 0 && rawData != null)
        {
            return writeData( offset, data, rawData );
        }
        byte[] buffer = new byte[getRawDataSize()];
        int pos = 0;
        for ( Iterator iterator = getEscherRecords().iterator(); iterator.hasNext(); )
        {
            EscherRecord r = iterator.next();
            pos += r.serialize(pos, buffer, new NullEscherSerializationListener() );
        }

        return writeData( offset, data, buffer );
    }

    /**
     * Process the bytes into escher records.
     * (Not done by default in case we break things,
     *  unless you set the "poi.deserialize.escher"
     *  system property)
     */
    public void processChildRecords() {
    	convertRawBytesToEscherRecords();
    }

    public int getRecordSize() {
        // TODO - convert this to a RecordAggregate
        return grossSizeFromDataSize(getRawDataSize());
    }

    private int getRawDataSize() {
        List escherRecords = getEscherRecords();
        byte[] rawData = getRawData();
        if (escherRecords.size() == 0 && rawData != null)
        {
            return rawData.length;
        }
        int size = 0;
        for ( Iterator iterator = escherRecords.iterator(); iterator.hasNext(); )
        {
            EscherRecord r = iterator.next();
            size += r.getRecordSize();
        }
        return size;
    }

    static int grossSizeFromDataSize(int dataSize)
    {
        return dataSize + ( (dataSize - 1) / MAX_DATA_SIZE + 1 ) * 4;
    }

    private int writeData( int offset, byte[] data, byte[] rawData )
    {
        int writtenActualData = 0;
        int writtenRawData = 0;
        while (writtenRawData < rawData.length)
        {
            int segmentLength = Math.min( rawData.length - writtenRawData, MAX_DATA_SIZE);
            if (writtenRawData / MAX_DATA_SIZE >= 2)
                writeContinueHeader( data, offset, segmentLength );
            else
                writeHeader( data, offset, segmentLength );
            writtenActualData += 4;
            offset += 4;
            System.arraycopy( rawData, writtenRawData, data, offset, segmentLength );
            offset += segmentLength;
            writtenRawData += segmentLength;
            writtenActualData += segmentLength;
        }
        return writtenActualData;
    }

    private void writeHeader( byte[] data, int offset, int sizeExcludingHeader )
    {
        LittleEndian.putShort(data, 0 + offset, getSid());
        LittleEndian.putShort(data, 2 + offset, (short) sizeExcludingHeader);
    }

    private void writeContinueHeader( byte[] data, int offset, int sizeExcludingHeader )
    {
        LittleEndian.putShort(data, 0 + offset, ContinueRecord.sid);
        LittleEndian.putShort(data, 2 + offset, (short) sizeExcludingHeader);
    }
}