Initial Commit

iTechSharp/iTextSharp/text/pdf/PdfReaderInstance.cs

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+using System;
+using System.IO;
+using System.Collections;
+
+using iTextSharp.text;
+
+/*
+ * Copyright 2001, 2002 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/
+ */
+
+namespace iTextSharp.text.pdf {
+    /**
+    * Instance of PdfReader in each output document.
+    *
+    * @author Paulo Soares (psoares@consiste.pt)
+    */
+    public class PdfReaderInstance {
+        internal static PdfLiteral IDENTITYMATRIX = new PdfLiteral("[1 0 0 1 0 0]");
+        internal static PdfNumber ONE = new PdfNumber(1);
+        internal int[] myXref;
+        internal PdfReader reader;
+        internal RandomAccessFileOrArray file;
+        internal Hashtable importedPages = new Hashtable();
+        internal PdfWriter writer;
+        internal Hashtable visited = new Hashtable();
+        internal ArrayList nextRound = new ArrayList();
+        
+        internal PdfReaderInstance(PdfReader reader, PdfWriter writer) {
+            this.reader = reader;
+            this.writer = writer;
+            file = reader.SafeFile;
+            myXref = new int[reader.XrefSize];
+        }
+        
+        internal PdfReader Reader {
+            get {
+                return reader;
+            }
+        }
+        
+        internal PdfImportedPage GetImportedPage(int pageNumber) {
+            if (!reader.IsOpenedWithFullPermissions)
+                throw new ArgumentException("PdfReader not opened with owner password");
+            if (pageNumber < 1 || pageNumber > reader.NumberOfPages)
+                throw new ArgumentException("Invalid page number: " + pageNumber);
+            PdfImportedPage pageT = (PdfImportedPage)importedPages[pageNumber];
+            if (pageT == null) {
+                pageT = new PdfImportedPage(this, writer, pageNumber);
+                importedPages[pageNumber] = pageT;
+            }
+            return pageT;
+        }
+        
+        internal int GetNewObjectNumber(int number, int generation) {
+            if (myXref[number] == 0) {
+                myXref[number] = writer.IndirectReferenceNumber;
+                nextRound.Add(number);
+            }
+            return myXref[number];
+        }
+        
+        internal RandomAccessFileOrArray ReaderFile {
+            get {
+                return file;
+            }
+        }
+        
+        internal PdfObject GetResources(int pageNumber) {
+            PdfObject obj = PdfReader.GetPdfObjectRelease(reader.GetPageNRelease(pageNumber).Get(PdfName.RESOURCES));
+            return obj;
+        }
+        
+        
+        internal PdfStream GetFormXObject(int pageNumber) {
+            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.Merge((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 = (PdfImportedPage)importedPages[pageNumber];
+            dic.Put(PdfName.BBOX, new PdfRectangle(impPage.BoundingBox));
+            PdfArray matrix = impPage.Matrix;
+            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);
+                stream.Merge(dic);
+            }
+            return stream;
+        }
+        
+        internal void WriteAllVisited() {
+            while (nextRound.Count > 0) {
+                ArrayList vec = nextRound;
+                nextRound = new ArrayList();
+                for (int k = 0; k < vec.Count; ++k) {
+                    int i = (int)vec[k];
+                    if (!visited.ContainsKey(i)) {
+                        visited[i] = null;
+                        writer.AddToBody(reader.GetPdfObjectRelease(i), myXref[i]);
+                    }
+                }
+            }
+        }
+        
+        internal void WriteAllPages() {
+            try {
+                file.ReOpen();
+                foreach (PdfImportedPage ip in importedPages.Values) {
+                    writer.AddToBody(ip.FormXObject, ip.IndirectReference);
+                }
+                WriteAllVisited();
+            }
+            finally {
+                try {
+                    reader.Close();
+                    file.Close();
+                }
+                catch  {
+                    //Empty on purpose
+                }
+            }
+        }
+    }
+}