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iText, a free Java-PDF library
/*
* $Id: d15f1355a5752b65fe66f5b0fc68ea34e7967e31 $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2015 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: [email protected]
*/
package com.itextpdf.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.itextpdf.text.Document;
import com.itextpdf.text.ExceptionConverter;
public class PRStream extends PdfStream {
protected PdfReader reader;
protected long 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, long 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();
Deflater deflater = new Deflater(compressionLevel);
DeflaterOutputStream zip = new DeflaterOutputStream(stream, deflater);
zip.write(conts);
zip.close();
deflater.end();
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 compressed.
* @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 compressed.
* @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();
Deflater deflater = new Deflater(compressionLevel);
DeflaterOutputStream zip = new DeflaterOutputStream(stream, deflater);
zip.write(data);
zip.close();
deflater.end();
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, as-is. This method will not
* remove or change any existing filter: the data has to match an existing
* filter or an appropriate filter has to be set.
*
* @param data data, possibly encrypted and/or compressed
* @since 5.5.0
*/
public void setDataRaw(byte[] data) {
this.offset = -1;
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 long 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);
}
}