Java tutorial
/* * * This file is part of the iText (R) project. Copyright (c) 1998-2019 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.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); } }