/*
*
* This file is part of the iText (R) project.
Copyright (c) 1998-2017 iText Group NV
* Authors: Bruno Lowagie, Paulo Soares, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
* ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
* OF THIRD PARTY RIGHTS
*
* This program 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 Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
* address: sales@itextpdf.com
*/
package com.itextpdf.text.pdf;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import com.itextpdf.text.error_messages.MessageLocalization;
/**
* Instance of PdfReader in each output document.
*
* @author Paulo Soares
*/
class PdfReaderInstance {
static final PdfLiteral IDENTITYMATRIX = new PdfLiteral("[1 0 0 1 0 0]");
static final PdfNumber ONE = new PdfNumber(1);
int myXref[];
PdfReader reader;
RandomAccessFileOrArray file;
HashMap<Integer, PdfImportedPage> importedPages = new HashMap<Integer, PdfImportedPage>();
PdfWriter writer;
HashSet<Integer> visited = new HashSet<Integer>();
ArrayList<Integer> nextRound = new ArrayList<Integer>();
PdfReaderInstance(PdfReader reader, PdfWriter writer) {
this.reader = reader;
this.writer = writer;
file = reader.getSafeFile();
myXref = new int[reader.getXrefSize()];
}
PdfReader getReader() {
return reader;
}
PdfImportedPage getImportedPage(int pageNumber) {
if (!reader.isOpenedWithFullPermissions())
throw new IllegalArgumentException(MessageLocalization.getComposedMessage("pdfreader.not.opened.with.owner.password"));
if (pageNumber < 1 || pageNumber > reader.getNumberOfPages())
throw new IllegalArgumentException(MessageLocalization.getComposedMessage("invalid.page.number.1", pageNumber));
Integer i = Integer.valueOf(pageNumber);
PdfImportedPage pageT = importedPages.get(i);
if (pageT == null) {
pageT = new PdfImportedPage(this, writer, pageNumber);
importedPages.put(i, pageT);
}
return pageT;
}
int getNewObjectNumber(int number, int generation) {
if (myXref[number] == 0) {
myXref[number] = writer.getIndirectReferenceNumber();
nextRound.add(Integer.valueOf(number));
}
return myXref[number];
}
RandomAccessFileOrArray getReaderFile() {
return file;
}
PdfObject getResources(int pageNumber) {
PdfObject obj = PdfReader.getPdfObjectRelease(reader.getPageNRelease(pageNumber).get(PdfName.RESOURCES));
return obj;
}
/**
* Gets the content stream of a page as a PdfStream object.
* @param pageNumber the page of which you want the stream
* @param compressionLevel the compression level you want to apply to the stream
* @return a PdfStream object
* @since 2.1.3 (the method already existed without param compressionLevel)
*/
PdfStream getFormXObject(int pageNumber, int compressionLevel) throws IOException {
PdfDictionary page = reader.getPageNRelease(pageNumber);
PdfObject contents = PdfReader.getPdfObjectRelease(page.get(PdfName.CONTENTS));
PdfDictionary dic = new PdfDictionary();
byte bout[] = null;
if (contents != null) {
if (contents.isStream())
dic.putAll((PRStream)contents);
else
bout = reader.getPageContent(pageNumber, file);
}
else
bout = new byte[0];
dic.put(PdfName.RESOURCES, PdfReader.getPdfObjectRelease(page.get(PdfName.RESOURCES)));
dic.put(PdfName.TYPE, PdfName.XOBJECT);
dic.put(PdfName.SUBTYPE, PdfName.FORM);
PdfImportedPage impPage = importedPages.get(Integer.valueOf(pageNumber));
dic.put(PdfName.BBOX, new PdfRectangle(impPage.getBoundingBox()));
PdfArray matrix = impPage.getMatrix();
if (matrix == null)
dic.put(PdfName.MATRIX, IDENTITYMATRIX);
else
dic.put(PdfName.MATRIX, matrix);
dic.put(PdfName.FORMTYPE, ONE);
PRStream stream;
if (bout == null) {
stream = new PRStream((PRStream)contents, dic);
}
else {
stream = new PRStream(reader, bout, compressionLevel);
stream.putAll(dic);
}
return stream;
}
void writeAllVisited() throws IOException {
while (!nextRound.isEmpty()) {
ArrayList<Integer> vec = nextRound;
nextRound = new ArrayList<Integer>();
for (int k = 0; k < vec.size(); ++k) {
Integer i = vec.get(k);
if (!visited.contains(i)) {
visited.add(i);
int n = i.intValue();
writer.addToBody(reader.getPdfObjectRelease(n), myXref[n]);
}
}
}
}
public void writeAllPages() throws IOException {
try {
file.reOpen();
for (Object element : importedPages.values()) {
PdfImportedPage ip = (PdfImportedPage)element;
if (ip.isToCopy()) {
writer.addToBody(ip.getFormXObject(writer.getCompressionLevel()), ip.getIndirectReference());
ip.setCopied();
}
}
writeAllVisited();
}
finally {
try {
// TODO: Removed - the user should be responsible for closing all PdfReaders. But, this could cause a lot of memory leaks in code out there that hasn't been properly closing things - maybe add a finalizer to PdfReader that calls PdfReader#close() ??
// reader.close();
file.close();
}
catch (Exception e) {
//Empty on purpose
}
}
}
}