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- /*
- * 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);
- }
-
- }
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