/*
 * Copyright (c) 2006 Adam Taft
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this
 * software and associated documentation files (the "Software"), to deal in the Software
 * without restriction, including without limitation the rights to use, copy, modify,
 * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies
 * or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE
 */
	
package com.adamtaft;
	
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Iterator;
	
import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathFactory;
	
import org.apache.commons.codec.binary.Base64;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
	
/**
 * Simple class which extracts media files bundled in Microsoft's MPF format.
 * Requires Apache Common's CODEC library, commons-codec.jar, to be in your classpath.
 * http://jakarta.apache.org/commons/codec/  (uses Base64 decoding)
 *
 * Usage: java com.adamtaft.MpfExtract [mpf file]
 *
 * Media files will be extracted into the same directory as the original MPF file.
 */
public class MpfExtractor {
	
	public static void main(String[] args) throws Exception {
		if (args.length != 1) {
			System.err.println("Usage: java MpfExtract [mpf file]");
			System.exit(1);
		}
	
		File f = new File(args[0]);
		InputStream is = new BufferedInputStream(new FileInputStream(f));
	
		XPathFactory xPathFactory = XPathFactory.newInstance();
		XPath xpath = xPathFactory.newXPath();
	
		xpath.setNamespaceContext(new NamespaceContext() {
			public String getNamespaceURI(String prefix) {
				if (prefix.equals("C")) return "urn:schemas-microsoft-com:office:clipgallery";
				if (prefix.equals("D")) return "DAV:";
				if (prefix.equals("dt")) return "urn:schemas-microsoft-com:datatypes";
				return XMLConstants.NULL_NS_URI;
			}
			public String getPrefix(String namespaceURI) {
				throw new UnsupportedOperationException();
			}
			public Iterator<?> getPrefixes(String namespaceURI) {
				throw new UnsupportedOperationException();
			}
		});
	
		XPathExpression filepathExpression = xpath.compile("./C:filepath/text()");
		XPathExpression dataExpression = xpath.compile("./C:contents/text()");
	
		NodeList list = (NodeList) xpath.evaluate("//C:resource", new InputSource(is), XPathConstants.NODESET);
	
		Base64 base64 = new Base64();
	
		for (int i=0, n=list.getLength(); i < n; i++) {
	
			String filename = filepathExpression.evaluate(list.item(i)).trim();
			if (filename.length() < 1) continue;
	
			String data = dataExpression.evaluate(list.item(i)).trim();
	
			File clip = new File(f.getParentFile(), filename);
			OutputStream out = new BufferedOutputStream(new FileOutputStream(clip));
			out.write(base64.decode(data.getBytes()));
			out.close();
	
			System.out.println("Extracting: " + clip.toString());
		}
	
		is.close();
	}
	
}