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• SignatureBox.java

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/*
 * $RCSfile: SignatureBox.java,v $
 *
 * 
 * Copyright (c) 2005 Sun Microsystems, Inc. All  Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met: 
 * 
 * - Redistribution of source code must retain the above copyright 
 *   notice, this  list of conditions and the following disclaimer.
 * 
 * - Redistribution in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in 
 *   the documentation and/or other materials provided with the
 *   distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of 
 * contributors may be used to endorse or promote products derived 
 * from this software without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any 
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND 
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
 * EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL 
 * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF 
 * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR 
 * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
 * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
 * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
 * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES. 
 * 
 * You acknowledge that this software is not designed or intended for 
 * use in the design, construction, operation or maintenance of any 
 * nuclear facility. 
 *
 * $Revision: 1.1 $
 * $Date: 2005/02/11 05:01:37 $
 * $State: Exp $
 */
package com.github.jaiimageio.jpeg2000.impl;
import javax.imageio.metadata.IIOInvalidTreeException;
import javax.imageio.metadata.IIOMetadataNode;

import org.w3c.dom.Node;

/** This class is defined to represent a Signature Box of JPEG JP2
 *  file format.  This type of box has a fixed length of 12, a type of "jP  "
 *  and a four byte content of 0x0D0A870A, which is used to detects of the
 *  common file transmission errors which substitutes  with  or
 *  vice versa.
 */
public class SignatureBox extends Box {
    /** Constructs a SignatureBox. */
    public SignatureBox() {
        super(12, 0x6A502020, null);
    }

    /** Constructs a SignatureBox based on the provided
     *  org.w3c.dom.Node.
     */
    public SignatureBox(Node node) throws IIOInvalidTreeException {
        super(node);
    }

    /** Constructs a SignatureBox based on the provided
     *  byte array.
     */
    public SignatureBox(byte[] data) throws IIOInvalidTreeException {
        super(12, 0x6A502020, data);
    }

    /** Creates an IIOMetadataNode from this signature
     *  box.  The format of this node is defined in the XML dtd and xsd
     *  for the JP2 image file.
     */
    public IIOMetadataNode getNativeNode() {
        IIOMetadataNode node = new IIOMetadataNode(Box.getName(getType()));
        setDefaultAttributes(node);
        node.setAttribute("Signature", Integer.toString(0x0D0A870A));
        return node;
    }

    protected void compose() {
        if (data != null)
            return;
        data = new byte[]{(byte)0x0D, (byte)0x0A, (byte)0x87, (byte)0x0A};
    }
}