/*
* $Id: PRStream.java 3538 2008-07-08 13:08:04Z blowagie $
*
* Copyright 2001, 2002 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.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
import com.lowagie.text.Document;
import com.lowagie.text.ExceptionConverter;
public class PRStream extends PdfStream {
protected PdfReader reader;
protected int offset;
protected int length;
//added by ujihara for decryption
protected int objNum = 0;
protected int objGen = 0;
public PRStream(PRStream stream, PdfDictionary newDic) {
reader = stream.reader;
offset = stream.offset;
length = stream.length;
compressed = stream.compressed;
compressionLevel = stream.compressionLevel;
streamBytes = stream.streamBytes;
bytes = stream.bytes;
objNum = stream.objNum;
objGen = stream.objGen;
if (newDic != null)
putAll(newDic);
else
hashMap.putAll(stream.hashMap);
}
public PRStream(PRStream stream, PdfDictionary newDic, PdfReader reader) {
this(stream, newDic);
this.reader = reader;
}
public PRStream(PdfReader reader, int offset) {
this.reader = reader;
this.offset = offset;
}
public PRStream(PdfReader reader, byte conts[]) {
this(reader, conts, DEFAULT_COMPRESSION);
}
/**
* Creates a new PDF stream object that will replace a stream
* in a existing PDF file.
* @param reader the reader that holds the existing PDF
* @param conts the new content
* @param compressionLevel the compression level for the content
* @since 2.1.3 (replacing the existing constructor without param compressionLevel)
*/
public PRStream(PdfReader reader, byte[] conts, int compressionLevel) {
this.reader = reader;
this.offset = -1;
if (Document.compress) {
try {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
DeflaterOutputStream zip = new DeflaterOutputStream(stream, new Deflater(compressionLevel));
zip.write(conts);
zip.close();
bytes = stream.toByteArray();
}
catch (IOException ioe) {
throw new ExceptionConverter(ioe);
}
put(PdfName.FILTER, PdfName.FLATEDECODE);
}
else
bytes = conts;
setLength(bytes.length);
}
/**
* Sets the data associated with the stream, either compressed or
* uncompressed. Note that the data will never be compressed if
* Document.compress is set to false.
*
* @param data raw data, decrypted and uncompressed.
* @param compress true if you want the stream to be compresssed.
* @since iText 2.1.1
*/
public void setData(byte[] data, boolean compress) {
setData(data, compress, DEFAULT_COMPRESSION);
}
/**
* Sets the data associated with the stream, either compressed or
* uncompressed. Note that the data will never be compressed if
* Document.compress is set to false.
*
* @param data raw data, decrypted and uncompressed.
* @param compress true if you want the stream to be compresssed.
* @param compressionLevel a value between -1 and 9 (ignored if compress == false)
* @since iText 2.1.3
*/
public void setData(byte[] data, boolean compress, int compressionLevel) {
remove(PdfName.FILTER);
this.offset = -1;
if (Document.compress && compress) {
try {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
DeflaterOutputStream zip = new DeflaterOutputStream(stream, new Deflater(compressionLevel));
zip.write(data);
zip.close();
bytes = stream.toByteArray();
this.compressionLevel = compressionLevel;
}
catch (IOException ioe) {
throw new ExceptionConverter(ioe);
}
put(PdfName.FILTER, PdfName.FLATEDECODE);
}
else
bytes = data;
setLength(bytes.length);
}
/**Sets the data associated with the stream
* @param data raw data, decrypted and uncompressed.
*/
public void setData(byte[] data) {
setData(data, true);
}
public void setLength(int length) {
this.length = length;
put(PdfName.LENGTH, new PdfNumber(length));
}
public int getOffset() {
return offset;
}
public int getLength() {
return length;
}
public PdfReader getReader() {
return reader;
}
public byte[] getBytes() {
return bytes;
}
public void setObjNum(int objNum, int objGen) {
this.objNum = objNum;
this.objGen = objGen;
}
int getObjNum() {
return objNum;
}
int getObjGen() {
return objGen;
}
public void toPdf(PdfWriter writer, OutputStream os) throws IOException {
byte[] b = PdfReader.getStreamBytesRaw(this);
PdfEncryption crypto = null;
if (writer != null)
crypto = writer.getEncryption();
PdfObject objLen = get(PdfName.LENGTH);
int nn = b.length;
if (crypto != null)
nn = crypto.calculateStreamSize(nn);
put(PdfName.LENGTH, new PdfNumber(nn));
superToPdf(writer, os);
put(PdfName.LENGTH, objLen);
os.write(STARTSTREAM);
if (length > 0) {
if (crypto != null && !crypto.isEmbeddedFilesOnly())
b = crypto.encryptByteArray(b);
os.write(b);
}
os.write(ENDSTREAM);
}
}