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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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* http://www.apache.org/licenses/LICENSE-2.0
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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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/* $Id: CrossReferenceTable.java 1305467 2012-03-26 17:39:20Z vhennebert $ */
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package org.apache.fop.pdf.xref;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.util.List;
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import org.apache.fop.pdf.PDFDictionary;
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import org.apache.fop.pdf.PDFDocument;
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* A cross-reference table, as described in Section 3.4.3 of the PDF 1.5 Reference.
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public class CrossReferenceTable extends CrossReferenceObject {
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private final List<Long> objectReferences;
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private final StringBuilder pdf = new StringBuilder(256);
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public CrossReferenceTable(TrailerDictionary trailerDictionary, long startxref,
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List<Long> location) {
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super(trailerDictionary, startxref);
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this.objectReferences = location;
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public void output(OutputStream stream) throws IOException {
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private void outputXref() throws IOException {
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pdf.append("xref\n0 ");
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pdf.append(objectReferences.size() + 1);
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pdf.append("\n0000000000 65535 f \n");
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for (Long objectReference : objectReferences) {
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final String padding = "0000000000";
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String s = String.valueOf(objectReference);
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if (s.length() > 10) {
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throw new IOException("PDF file too large."
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+ " PDF 1.4 cannot grow beyond approx. 9.3GB.");
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String loc = padding.substring(s.length()) + s;
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pdf.append(loc).append(" 00000 n \n");
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private void writeTrailer(OutputStream stream) throws IOException {
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pdf.append("trailer\n");
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stream.write(PDFDocument.encode(pdf.toString()));
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PDFDictionary dictionary = trailerDictionary.getDictionary();
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dictionary.put("/Size", objectReferences.size() + 1);
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dictionary.output(stream);