src/java/org/apache/poi/ddf/EscherBlipRecord.java

/* ====================================================================
   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.ddf;

import org.apache.poi.util.LittleEndian;
import org.apache.poi.util.HexDump;

import java.io.ByteArrayOutputStream;

/**
 * @author Glen Stampoultzis
 * @version $Id$
 */
public class EscherBlipRecord
        extends EscherRecord
{
    public static final short  RECORD_ID_START    = (short) 0xF018;
    public static final short  RECORD_ID_END      = (short) 0xF117;
    public static final String RECORD_DESCRIPTION = "msofbtBlip";

    private static final int   HEADER_SIZE               = 8;

    protected              byte[] field_pictureData;

    public EscherBlipRecord()
    {
    }

    /**
     * This method deserializes the record from a byte array.
     *
     * @param data          The byte array containing the escher record information
     * @param offset        The starting offset into <code>data</code>.
     * @param recordFactory May be null since this is not a container record.
     * @return The number of bytes read from the byte array.
     */
    public int fillFields( byte[] data, int offset, EscherRecordFactory recordFactory )
    {
        int bytesAfterHeader = readHeader( data, offset );
        int pos              = offset + HEADER_SIZE;

        field_pictureData = new byte[bytesAfterHeader];
        System.arraycopy(data, pos, field_pictureData, 0, bytesAfterHeader);

        return bytesAfterHeader + 8;
    }

    /**
     * Serializes the record to an existing byte array.
     *
     * @param offset    the offset within the byte array
     * @param data      the data array to serialize to
     * @param listener  a listener for begin and end serialization events.  This
     *                  is useful because the serialization is
     *                  hierarchical/recursive and sometimes you need to be able
     *                  break into that.
     * @return the number of bytes written.
     */
    public int serialize( int offset, byte[] data, EscherSerializationListener listener )
    {
        listener.beforeRecordSerialize(offset, getRecordId(), this);

        LittleEndian.putShort( data, offset, getOptions() );
        LittleEndian.putShort( data, offset + 2, getRecordId() );

        System.arraycopy( field_pictureData, 0, data, offset + 4, field_pictureData.length );

        listener.afterRecordSerialize(offset + 4 + field_pictureData.length, getRecordId(), field_pictureData.length + 4, this);
        return field_pictureData.length + 4;
    }

    /**
     * Returns the number of bytes that are required to serialize this record.
     *
     * @return Number of bytes
     */
    public int getRecordSize()
    {
        return field_pictureData.length + HEADER_SIZE;
    }

    /**
     * The short name for this record
     */
    public String getRecordName()
    {
        return "Blip";
    }

    public byte[] getPicturedata()
    {
        return field_pictureData;
    }

    public void setPictureData(byte[] pictureData)
    {
        field_pictureData = pictureData;
    }

    public String toString()
    {
        String nl = System.getProperty( "line.separator" );

        String extraData;
        ByteArrayOutputStream b = new ByteArrayOutputStream();
        try
        {
            HexDump.dump( this.field_pictureData, 0, b, 0 );
            extraData = b.toString();
        }
        catch ( Exception e )
        {
            extraData = e.toString();
        }
        return getClass().getName() + ":" + nl +
                "  RecordId: 0x" + HexDump.toHex( getRecordId() ) + nl +
                "  Options: 0x" + HexDump.toHex( getOptions() ) + nl +
                "  Extra Data:" + nl + extraData;

    }
}