mirror of https://github.com/apache/lucene.git
91 lines
3.7 KiB
Java
91 lines
3.7 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import java.io.File;
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import java.io.IOException;
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import java.io.OutputStream;
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import org.apache.pdfbox.cos.COSBase;
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import org.apache.pdfbox.cos.COSName;
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import org.apache.pdfbox.cos.COSObject;
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import org.apache.pdfbox.cos.COSStream;
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import org.apache.pdfbox.pdmodel.PDDocument;
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import org.apache.pdfbox.pdmodel.common.PDStream;
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/**
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* A simple command line utility for reducing the size of the ref-guide PDF.
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* <p>
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* Currently this script focuses on using {@link COSName#FLATE_DECODE} to compress the (decoded) Objects
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* in the source PDF, but other improvements may be possible in the future.
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* </p>
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* <p>
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* This code is originally based on the <code>WriteDecodedDoc</code> example provided with <a href="https://pdfbox.apache.org/">Apache PDFBox</a>.
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* </p>
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* <p>
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* <b>NOTE:</b> This class should <em>NOT</em> be considered a general purpose tool for reducing the size of
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* <em>any</em> PDF.
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* Decisions made in this code can and will be focused explicitly on serving the purpose of reducing the size of the
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* Solr Reference Guide PDF, as originally produced by asciidoctor, and may not be generally useful for all PDFs
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* "in the wild".
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* </p>
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*/
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public class ReducePDFSize {
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public static void main(String[] args) throws IOException {
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if (2 != args.length) {
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throw new RuntimeException("arg0 must be input file, org1 must be output file");
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}
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String in = args[0];
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String out = args[1];
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PDDocument doc = null;
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try {
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doc = PDDocument.load(new File(in));
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doc.setAllSecurityToBeRemoved(true);
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for (COSObject cosObject : doc.getDocument().getObjects()) {
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COSBase base = cosObject.getObject();
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// if it's a stream: decode it, then re-write it using FLATE_DECODE
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if (base instanceof COSStream) {
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COSStream stream = (COSStream) base;
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byte[] bytes;
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try {
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bytes = new PDStream(stream).toByteArray();
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} catch (IOException ex) {
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// NOTE: original example code from PDFBox just logged & "continue;"d here, 'skipping' this stream.
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// If this type of failure ever happens, we can (perhaps) consider (re)ignoring this type of failure?
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//
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// IIUC then that will leave the original (non-decoded / non-flated) stream in place?
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throw new RuntimeException("can't serialize byte[] from: " +
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cosObject.getObjectNumber() + " " +
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cosObject.getGenerationNumber() + " obj: " +
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ex.getMessage(), ex);
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}
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stream.removeItem(COSName.FILTER);
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OutputStream streamOut = stream.createOutputStream(COSName.FLATE_DECODE);
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streamOut.write(bytes);
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streamOut.close();
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}
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}
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doc.getDocumentCatalog();
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doc.save( out );
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} finally {
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if ( doc != null ) {
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doc.close();
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}
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}
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}
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}
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