/*
* Copyright 2010 adam.
*
* Licensed 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.
* under the License.
*/
package org.apache.pdfbox.tools;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSObject;
import org.apache.pdfbox.cos.COSStream;
import org.apache.pdfbox.pdfparser.PDFObjectStreamParser;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.persistence.util.COSObjectKey;
/**
* This program will just take all of the stream objects in a PDF and dereference
* them. The streams will be gone in the resulting file and the objects will be
* present. This is very helpful when trying to debug problems as it'll make
* it possible to easily look through a PDF using a text editor. It also exposes
* problems which stem from objects inside object streams overwriting other
* objects.
* @author <a href="adam@apache.org">Adam Nichols</a>
*/
public class DecompressObjectstreams {
/**
* This is a very simple program, so everything is in the main method.
* @param args arguments to the program
*/
public static void main(String[] args) {
// suppress the Dock icon on OS X
System.setProperty("apple.awt.UIElement", "true");
if(args.length < 1)
usage();
String inputFilename = args[0];
String outputFilename;
if(args.length > 1) {
outputFilename = args[1];
} else {
if(inputFilename.matches(".*\\.[pP][dD][fF]$"))
outputFilename = inputFilename.replaceAll("\\.[pP][dD][fF]$", ".unc.pdf");
else
outputFilename = inputFilename + ".unc.pdf";
}
PDDocument doc = null;
try {
doc = PDDocument.load(inputFilename);
for(COSObject objStream : doc.getDocument().getObjectsByType(COSName.OBJ_STM)) {
COSStream stream = (COSStream)objStream.getObject();
PDFObjectStreamParser sp = new PDFObjectStreamParser(stream, doc.getDocument());
sp.parse();
for(COSObject next : sp.getObjects()) {
COSObjectKey key = new COSObjectKey(next);
COSObject obj = doc.getDocument().getObjectFromPool(key);
obj.setObject(next.getObject());
}
doc.getDocument().removeObject(new COSObjectKey(objStream));
}
doc.save(outputFilename);
} catch(Exception e) {
System.out.println("Error processing file: " + e.getMessage());
} finally {
if(doc != null)
try { doc.close(); } catch(Exception e) { }
}
}
/**
* Explains how to use the program.
*/
private static void usage() {
System.err.println( "Usage: java -cp pdfbox-app-x.y.z.jar "
+ "org.apache.pdfbox.tools.DecompressObjectstreams <input PDF File> [<Output PDF File>]\n"
+ " <input PDF File> The PDF document to decompress\n"
+ " <output PDF File> The output filename (default is to replace .pdf with .unc.pdf)");
System.exit(1);
}
}