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    1   /*
    2    * $Id: PRStream.java 3633 2008-12-23 18:42:06Z xlv $
    3    *
    4    * Copyright 2001, 2002 by Paulo Soares.
    5    *
    6    * The contents of this file are subject to the Mozilla Public License Version 1.1
    7    * (the "License"); you may not use this file except in compliance with the License.
    8    * You may obtain a copy of the License at http://www.mozilla.org/MPL/
    9    *
   10    * Software distributed under the License is distributed on an "AS IS" basis,
   11    * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
   12    * for the specific language governing rights and limitations under the License.
   13    *
   14    * The Original Code is 'iText, a free JAVA-PDF library'.
   15    *
   16    * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
   17    * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
   18    * All Rights Reserved.
   19    * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
   20    * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
   21    *
   22    * Contributor(s): all the names of the contributors are added in the source code
   23    * where applicable.
   24    *
   25    * Alternatively, the contents of this file may be used under the terms of the
   26    * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
   27    * provisions of LGPL are applicable instead of those above.  If you wish to
   28    * allow use of your version of this file only under the terms of the LGPL
   29    * License and not to allow others to use your version of this file under
   30    * the MPL, indicate your decision by deleting the provisions above and
   31    * replace them with the notice and other provisions required by the LGPL.
   32    * If you do not delete the provisions above, a recipient may use your version
   33    * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
   34    *
   35    * This library is free software; you can redistribute it and/or modify it
   36    * under the terms of the MPL as stated above or under the terms of the GNU
   37    * Library General Public License as published by the Free Software Foundation;
   38    * either version 2 of the License, or any later version.
   39    *
   40    * This library is distributed in the hope that it will be useful, but WITHOUT
   41    * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
   42    * FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
   43    * details.
   44    *
   45    * If you didn't download this code from the following link, you should check if
   46    * you aren't using an obsolete version:
   47    * http://www.lowagie.com/iText/
   48    */
   49   
   50   package com.lowagie.text.pdf;
   51   
   52   import java.io.ByteArrayOutputStream;
   53   import java.io.IOException;
   54   import java.io.OutputStream;
   55   import java.util.zip.Deflater;
   56   import java.util.zip.DeflaterOutputStream;
   57   
   58   import com.lowagie.text.Document;
   59   import com.lowagie.text.ExceptionConverter;
   60   
   61   public class PRStream extends PdfStream {
   62       
   63       protected PdfReader reader;
   64       protected int offset;
   65       protected int length;
   66       
   67       //added by ujihara for decryption
   68       protected int objNum = 0;
   69       protected int objGen = 0;
   70       
   71       public PRStream(PRStream stream, PdfDictionary newDic) {
   72           reader = stream.reader;
   73           offset = stream.offset;
   74           length = stream.length;
   75           compressed = stream.compressed;
   76           compressionLevel = stream.compressionLevel;
   77           streamBytes = stream.streamBytes;
   78           bytes = stream.bytes;
   79           objNum = stream.objNum;
   80           objGen = stream.objGen;
   81           if (newDic != null)
   82               putAll(newDic);
   83           else
   84               hashMap.putAll(stream.hashMap);
   85       }
   86   
   87       public PRStream(PRStream stream, PdfDictionary newDic, PdfReader reader) {
   88           this(stream, newDic);
   89           this.reader = reader;
   90       }
   91   
   92       public PRStream(PdfReader reader, int offset) {
   93           this.reader = reader;
   94           this.offset = offset;
   95       }
   96   
   97       public PRStream(PdfReader reader, byte conts[]) {
   98       	this(reader, conts, DEFAULT_COMPRESSION);
   99       }
  100   
  101       /**
  102        * Creates a new PDF stream object that will replace a stream
  103        * in a existing PDF file.
  104        * @param	reader	the reader that holds the existing PDF
  105        * @param	conts	the new content
  106        * @param	compressionLevel	the compression level for the content
  107        * @since	2.1.3 (replacing the existing constructor without param compressionLevel)
  108        */
  109       public PRStream(PdfReader reader, byte[] conts, int compressionLevel) {
  110           this.reader = reader;
  111           this.offset = -1;
  112           if (Document.compress) {
  113               try {
  114                   ByteArrayOutputStream stream = new ByteArrayOutputStream();
  115                   Deflater deflater = new Deflater(compressionLevel);
  116                   DeflaterOutputStream zip = new DeflaterOutputStream(stream, deflater);
  117                   zip.write(conts);
  118                   zip.close();
  119                   deflater.end();
  120                   bytes = stream.toByteArray();
  121               }
  122               catch (IOException ioe) {
  123                   throw new ExceptionConverter(ioe);
  124               }
  125               put(PdfName.FILTER, PdfName.FLATEDECODE);
  126           }
  127           else
  128               bytes = conts;
  129           setLength(bytes.length);
  130       }
  131       
  132       /**
  133        * Sets the data associated with the stream, either compressed or
  134        * uncompressed. Note that the data will never be compressed if
  135        * Document.compress is set to false.
  136        * 
  137        * @param data raw data, decrypted and uncompressed.
  138        * @param compress true if you want the stream to be compressed.
  139        * @since	iText 2.1.1
  140        */
  141       public void setData(byte[] data, boolean compress) {
  142       	setData(data, compress, DEFAULT_COMPRESSION);
  143       }
  144       
  145       /**
  146        * Sets the data associated with the stream, either compressed or
  147        * uncompressed. Note that the data will never be compressed if
  148        * Document.compress is set to false.
  149        * 
  150        * @param data raw data, decrypted and uncompressed.
  151        * @param compress true if you want the stream to be compressed.
  152        * @param compressionLevel	a value between -1 and 9 (ignored if compress == false)
  153        * @since	iText 2.1.3
  154        */
  155       public void setData(byte[] data, boolean compress, int compressionLevel) {
  156           remove(PdfName.FILTER);
  157           this.offset = -1;
  158           if (Document.compress && compress) {
  159               try {
  160                   ByteArrayOutputStream stream = new ByteArrayOutputStream();
  161                   Deflater deflater = new Deflater(compressionLevel);
  162                   DeflaterOutputStream zip = new DeflaterOutputStream(stream, deflater);
  163                   zip.write(data);
  164                   zip.close();
  165                   deflater.end();
  166                   bytes = stream.toByteArray();
  167                   this.compressionLevel = compressionLevel;
  168               }
  169               catch (IOException ioe) {
  170                   throw new ExceptionConverter(ioe);
  171               }
  172               put(PdfName.FILTER, PdfName.FLATEDECODE);
  173           }
  174           else
  175               bytes = data;
  176           setLength(bytes.length);
  177       }
  178       
  179       /**Sets the data associated with the stream
  180        * @param data raw data, decrypted and uncompressed.
  181        */
  182       public void setData(byte[] data) {
  183           setData(data, true);
  184       }
  185   
  186       public void setLength(int length) {
  187           this.length = length;
  188           put(PdfName.LENGTH, new PdfNumber(length));
  189       }
  190       
  191       public int getOffset() {
  192           return offset;
  193       }
  194       
  195       public int getLength() {
  196           return length;
  197       }
  198       
  199       public PdfReader getReader() {
  200           return reader;
  201       }
  202       
  203       public byte[] getBytes() {
  204           return bytes;
  205       }
  206       
  207       public void setObjNum(int objNum, int objGen) {
  208           this.objNum = objNum;
  209           this.objGen = objGen;
  210       }
  211       
  212       int getObjNum() {
  213           return objNum;
  214       }
  215       
  216       int getObjGen() {
  217           return objGen;
  218       }
  219       
  220       public void toPdf(PdfWriter writer, OutputStream os) throws IOException {
  221           byte[] b = PdfReader.getStreamBytesRaw(this);
  222           PdfEncryption crypto = null;
  223           if (writer != null)
  224               crypto = writer.getEncryption();
  225           PdfObject objLen = get(PdfName.LENGTH);
  226           int nn = b.length;
  227           if (crypto != null)
  228               nn = crypto.calculateStreamSize(nn);
  229           put(PdfName.LENGTH, new PdfNumber(nn));
  230           superToPdf(writer, os);
  231           put(PdfName.LENGTH, objLen);
  232           os.write(STARTSTREAM);
  233           if (length > 0) {
  234               if (crypto != null && !crypto.isEmbeddedFilesOnly())
  235                   b = crypto.encryptByteArray(b);
  236               os.write(b);
  237           }
  238           os.write(ENDSTREAM);
  239       }
  240   }

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