| /* |
| * 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.ByteArrayOutputStream; |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.fop.pdf.PDFArray; |
| import org.apache.fop.pdf.PDFDictionary; |
| import org.apache.fop.pdf.PDFDocument; |
| import org.apache.fop.pdf.PDFFilterList; |
| import org.apache.fop.pdf.PDFName; |
| import org.apache.fop.pdf.PDFStream; |
| |
| /** |
| * A cross-reference stream, as described in Section 3.4.7 of the PDF 1.5 Reference. |
| */ |
| public class CrossReferenceStream extends CrossReferenceObject { |
| |
| private static final PDFName XREF = new PDFName("XRef"); |
| |
| private final PDFDocument document; |
| |
| private final int objectNumber; |
| |
| private final List<ObjectReference> objectReferences; |
| |
| public CrossReferenceStream(PDFDocument document, |
| int objectNumber, |
| TrailerDictionary trailerDictionary, |
| long startxref, |
| List<Long> uncompressedObjectReferences, |
| List<CompressedObjectReference> compressedObjectReferences) { |
| super(trailerDictionary, startxref); |
| this.document = document; |
| this.objectNumber = objectNumber; |
| this.objectReferences = new ArrayList<ObjectReference>(uncompressedObjectReferences.size()); |
| for (Long offset : uncompressedObjectReferences) { |
| objectReferences.add(offset == null ? null : new UncompressedObjectReference(offset)); |
| } |
| for (CompressedObjectReference ref : compressedObjectReferences) { |
| this.objectReferences.set(ref.getObjectNumber() - 1, ref); |
| } |
| } |
| |
| /** {@inheritDoc} */ |
| public void output(OutputStream stream) throws IOException { |
| populateDictionary(); |
| PDFStream helperStream = new PDFStream(trailerDictionary.getDictionary(), false) { |
| |
| @Override |
| protected void setupFilterList() { |
| PDFFilterList filterList = getFilterList(); |
| assert !filterList.isInitialized(); |
| filterList.addDefaultFilters(document.getFilterMap(), getDefaultFilterName()); |
| } |
| |
| }; |
| helperStream.setObjectNumber(objectNumber); |
| helperStream.setDocument(document); |
| ByteArrayOutputStream byteArray = new ByteArrayOutputStream(); |
| DataOutputStream data = new DataOutputStream(byteArray); |
| addFreeEntryForObject0(data); |
| for (ObjectReference objectReference : objectReferences) { |
| assert objectReference != null; |
| objectReference.output(data); |
| } |
| new UncompressedObjectReference(startxref).output(data); |
| data.close(); |
| helperStream.setData(byteArray.toByteArray()); |
| PDFDocument.outputIndirectObject(helperStream, stream); |
| } |
| |
| private void populateDictionary() throws IOException { |
| int objectCount = objectReferences.size() + 1; |
| PDFDictionary dictionary = trailerDictionary.getDictionary(); |
| dictionary.put("/Type", XREF); |
| dictionary.put("/Size", objectCount + 1); |
| dictionary.put("/W", new PDFArray(1, 8, 2)); |
| } |
| |
| private void addFreeEntryForObject0(DataOutputStream data) throws IOException { |
| data.write(new byte[] {0, 0, 0, 0, 0, 0, 0, 0, 0, (byte) 0xff, (byte) 0xff}); |
| } |
| |
| } |