pdfstamperimp.java

iText是一个能够快速产生PDF文件的java类库。iText的java类对于那些要产生包含文本

/*
 * Copyright 2003 by Paulo Soares.
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 */
package com.lowagie.text.pdf;

import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import com.lowagie.text.DocumentException;
import com.lowagie.text.ExceptionConverter;
import com.lowagie.text.Image;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.collection.PdfCollection;
import com.lowagie.text.pdf.interfaces.PdfViewerPreferences;
import com.lowagie.text.pdf.internal.PdfViewerPreferencesImp;

class PdfStamperImp extends PdfWriter {
    HashMap readers2intrefs = new HashMap();
    HashMap readers2file = new HashMap();
    RandomAccessFileOrArray file;
    PdfReader reader;
    IntHashtable myXref = new IntHashtable();
    /** Integer(page number) -> PageStamp */
    HashMap pagesToContent = new HashMap();
    boolean closed = false;
    /** Holds value of property rotateContents. */
    private boolean rotateContents = true;
    protected AcroFields acroFields;
    protected boolean flat = false;
    protected boolean flatFreeText = false;
    protected int namePtr[] = {0};
    protected boolean namedAsNames;
    protected List newBookmarks;
    protected HashSet partialFlattening = new HashSet();
    protected boolean useVp = false;
    protected PdfViewerPreferencesImp viewerPreferences = new PdfViewerPreferencesImp();
    protected HashMap fieldTemplates = new HashMap();
    protected boolean fieldsAdded = false;
    protected int sigFlags = 0;
    protected boolean append;
    protected IntHashtable marked;
    protected int initialXrefSize;
    protected PdfAction openAction;
    
    /** Creates new PdfStamperImp.
     * @param reader the read PDF
     * @param os the output destination
     * @param pdfVersion the new pdf version or '\0' to keep the same version as the original
     * document
     * @param append
     * @throws DocumentException on error
     * @throws IOException
     */
    PdfStamperImp(PdfReader reader, OutputStream os, char pdfVersion, boolean append) throws DocumentException, IOException {
        super(new PdfDocument(), os);
        if (!reader.isOpenedWithFullPermissions())
            throw new IllegalArgumentException("PdfReader not opened with owner password");
        if (reader.isTampered())
            throw new DocumentException("The original document was reused. Read it again from file.");
        reader.setTampered(true);
        this.reader = reader;
        file = reader.getSafeFile();
        this.append = append;
        if (append) {
            if (reader.isRebuilt())
                throw new DocumentException("Append mode requires a document without errors even if recovery was possible.");
            if (reader.isEncrypted())
                crypto = new PdfEncryption(reader.getDecrypt());
            pdf_version.setAppendmode(true);
            file.reOpen();
            byte buf[] = new byte[8192];
            int n;
            while ((n = file.read(buf)) > 0)
                this.os.write(buf, 0, n);
            file.close();
            prevxref = reader.getLastXref();
            reader.setAppendable(true);
        }
        else {
            if (pdfVersion == 0)
                super.setPdfVersion(reader.getPdfVersion());
            else
                super.setPdfVersion(pdfVersion);
        }
        super.open();
        pdf.addWriter(this);
        if (append) {
            body.setRefnum(reader.getXrefSize());
            marked = new IntHashtable();
            if (reader.isNewXrefType())
                fullCompression = true;
            if (reader.isHybridXref())
                fullCompression = false;
        }
        initialXrefSize = reader.getXrefSize();
    }
    
    void close(HashMap moreInfo) throws IOException {
        if (closed)
            return;
        if (useVp) {
            reader.setViewerPreferences(viewerPreferences);
            markUsed(reader.getTrailer().get(PdfName.ROOT));
        }
        if (flat)
            flatFields();
        if (flatFreeText)
        	flatFreeTextFields();
        addFieldResources();
        PdfDictionary acroForm = (PdfDictionary)PdfReader.getPdfObject(reader.getCatalog().get(PdfName.ACROFORM), reader.getCatalog());
        if (acroFields != null && acroFields.getXfa().isChanged()) {
            markUsed(acroForm);
            if (!flat)
                acroFields.getXfa().setXfa(this);
        }
        if (sigFlags != 0) {
            if (acroForm != null) {
                acroForm.put(PdfName.SIGFLAGS, new PdfNumber(sigFlags));
                markUsed(acroForm);
            }
        }
        closed = true;
        addSharedObjectsToBody();
        setOutlines();
        setJavaScript();
        addFileAttachments();
        PdfDictionary catalog = reader.getCatalog();        	
        if (openAction != null) {
            catalog.put(PdfName.OPENACTION, openAction);
        }
        byte[] altMetadata = xmpMetadata;
        if (altMetadata == null) {
            PdfObject xmpo = PdfReader.getPdfObject(catalog.get(PdfName.METADATA));
            if (xmpo != null && xmpo.isStream()) {
                altMetadata = PdfReader.getStreamBytesRaw((PRStream)xmpo);
                PdfReader.killIndirect(xmpo);
            }
        }
        // if there is XMP data to add: add it
        if (altMetadata != null) {
        	PdfStream xmp = new PdfStream(altMetadata);
        	xmp.put(PdfName.TYPE, PdfName.METADATA);
        	xmp.put(PdfName.SUBTYPE, PdfName.XML);
            if (crypto != null && !crypto.isMetadataEncrypted()) {
                PdfArray ar = new PdfArray();
                ar.add(PdfName.CRYPT);
                xmp.put(PdfName.FILTER, ar);
            }
        	catalog.put(PdfName.METADATA, body.add(xmp).getIndirectReference());
        	markUsed(catalog);
        }
        PRIndirectReference iInfo = null;
        try {
            file.reOpen();
            alterContents();
            iInfo = (PRIndirectReference)reader.trailer.get(PdfName.INFO);
            int skip = -1;
            if (iInfo != null)
                skip = iInfo.getNumber();
            int rootN = ((PRIndirectReference)reader.trailer.get(PdfName.ROOT)).getNumber();
            if (append) {
                int keys[] = marked.getKeys();
                for (int k = 0; k < keys.length; ++k) {
                    int j = keys[k];
                    PdfObject obj = reader.getPdfObjectRelease(j);
                    if (obj != null && skip != j && j < initialXrefSize) {
                        addToBody(obj, j, j != rootN);
                    }
                }
                for (int k = initialXrefSize; k < reader.getXrefSize(); ++k) {
                    PdfObject obj = reader.getPdfObject(k);
                    if (obj != null) {
                        addToBody(obj, getNewObjectNumber(reader, k, 0));
                    }
                }
            }
            else {
                for (int k = 1; k < reader.getXrefSize(); ++k) {
                    PdfObject obj = reader.getPdfObjectRelease(k);
                    if (obj != null && skip != k) {
                        addToBody(obj, getNewObjectNumber(reader, k, 0), k != rootN);
                    }
                }
            }
        }
        finally {
            try {
                file.close();
            }
            catch (Exception e) {
                // empty on purpose
            }
        }
        PdfIndirectReference encryption = null;
        PdfObject fileID = null;
        if (crypto != null) {
            if (append) {
                encryption = reader.getCryptoRef();
            }
            else {
                PdfIndirectObject encryptionObject = addToBody(crypto.getEncryptionDictionary(), false);
                encryption = encryptionObject.getIndirectReference();
            }
            fileID = crypto.getFileID();
        }
        else
            fileID = PdfEncryption.createInfoId(PdfEncryption.createDocumentId());
        PRIndirectReference iRoot = (PRIndirectReference)reader.trailer.get(PdfName.ROOT);
        PdfIndirectReference root = new PdfIndirectReference(0, getNewObjectNumber(reader, iRoot.getNumber(), 0));
        PdfIndirectReference info = null;
        PdfDictionary oldInfo = (PdfDictionary)PdfReader.getPdfObject(iInfo);
        PdfDictionary newInfo = new PdfDictionary();
        if (oldInfo != null) {
            for (Iterator i = oldInfo.getKeys().iterator(); i.hasNext();) {
                PdfName key = (PdfName)i.next();
                PdfObject value = PdfReader.getPdfObject(oldInfo.get(key));
                newInfo.put(key, value);
            }
        }
        if (moreInfo != null) {
            for (Iterator i = moreInfo.entrySet().iterator(); i.hasNext();) {
                Map.Entry entry = (Map.Entry) i.next();
                String key = (String) entry.getKey();
                PdfName keyName = new PdfName(key);
                String value = (String) entry.getValue();
                if (value == null)
                    newInfo.remove(keyName);
                else
                    newInfo.put(keyName, new PdfString(value, PdfObject.TEXT_UNICODE));
            }
        }
        if (append) {
            if (iInfo == null)
                info = addToBody(newInfo, false).getIndirectReference();
            else
                info = addToBody(newInfo, iInfo.getNumber(), false).getIndirectReference();
        }
        else {
            if (!newInfo.getKeys().isEmpty())
                info = addToBody(newInfo, false).getIndirectReference();
        }
        // write the cross-reference table of the body
        body.writeCrossReferenceTable(os, root, info, encryption, fileID, prevxref);
        if (fullCompression) {
            os.write(getISOBytes("startxref\n"));
            os.write(getISOBytes(String.valueOf(body.offset())));
            os.write(getISOBytes("\n%%EOF\n"));
        }
        else {