| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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. |
| */ |
| |
| /* $Id$ */ |
| |
| package org.apache.fop.pdf.xref; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.util.List; |
| |
| import org.apache.fop.pdf.PDFDictionary; |
| import org.apache.fop.pdf.PDFDocument; |
| |
| /** |
| * A cross-reference table, as described in Section 3.4.3 of the PDF 1.5 Reference. |
| */ |
| public class CrossReferenceTable extends CrossReferenceObject { |
| |
| private final List<Long> objectReferences; |
| |
| private final StringBuilder pdf = new StringBuilder(256); |
| |
| public CrossReferenceTable(TrailerDictionary trailerDictionary, long startxref, |
| List<Long> location) { |
| super(trailerDictionary, startxref); |
| this.objectReferences = location; |
| } |
| |
| public void output(OutputStream stream) throws IOException { |
| outputXref(); |
| writeTrailer(stream); |
| } |
| |
| private void outputXref() throws IOException { |
| pdf.append("xref\n0 "); |
| pdf.append(objectReferences.size() + 1); |
| pdf.append("\n0000000000 65535 f \n"); |
| for (Long objectReference : objectReferences) { |
| final String padding = "0000000000"; |
| String s = String.valueOf(objectReference); |
| if (s.length() > 10) { |
| throw new IOException("PDF file too large." |
| + " PDF 1.4 cannot grow beyond approx. 9.3GB."); |
| } |
| String loc = padding.substring(s.length()) + s; |
| pdf.append(loc).append(" 00000 n \n"); |
| } |
| } |
| |
| private void writeTrailer(OutputStream stream) throws IOException { |
| pdf.append("trailer\n"); |
| stream.write(PDFDocument.encode(pdf.toString())); |
| PDFDictionary dictionary = trailerDictionary.getDictionary(); |
| dictionary.put("/Size", objectReferences.size() + 1); |
| dictionary.output(stream); |
| } |
| |
| } |