From 6025b6016517c6d898d8957d1d7e03ba71431912 Mon Sep 17 00:00:00 2001 From: tknall Date: Fri, 1 Dec 2006 12:20:24 +0000 Subject: Initial import of release 2.2. git-svn-id: https://joinup.ec.europa.eu/svn/pdf-as/trunk@4 7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c --- src/main/java/com/lowagie/text/pdf/PdfStream.java | 313 ++++++++++++++++++++++ 1 file changed, 313 insertions(+) create mode 100644 src/main/java/com/lowagie/text/pdf/PdfStream.java (limited to 'src/main/java/com/lowagie/text/pdf/PdfStream.java') diff --git a/src/main/java/com/lowagie/text/pdf/PdfStream.java b/src/main/java/com/lowagie/text/pdf/PdfStream.java new file mode 100644 index 0000000..3d3b9dd --- /dev/null +++ b/src/main/java/com/lowagie/text/pdf/PdfStream.java @@ -0,0 +1,313 @@ +/* + * $Id: PdfStream.java,v 1.57 2005/11/01 12:27:05 psoares33 Exp $ + * $Name: $ + * + * Copyright 1999, 2000, 2001, 2002 Bruno Lowagie + * + * 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.OutputStream; +import java.io.InputStream; +import java.io.IOException; +import java.util.zip.DeflaterOutputStream; +import java.util.zip.Deflater; +import com.lowagie.text.Document; +import com.lowagie.text.DocWriter; +import com.lowagie.text.ExceptionConverter; + +/** + * PdfStream is the Pdf stream object. + *

+ * A stream, like a string, is a sequence of characters. However, an application can + * read a small portion of a stream at a time, while a string must be read in its entirety. + * For this reason, objects with potentially large amounts of data, such as images and + * page descriptions, are represented as streams.
+ * A stream consists of a dictionary that describes a sequence of characters, followed by + * the keyword stream, followed by zero or more lines of characters, followed by + * the keyword endstream.
+ * All streams must be PdfIndirectObjects. The stream dictionary must be a direct + * object. The keyword stream that follows the stream dictionary should be followed by + * a carriage return and linefeed or just a linefeed.
+ * Remark: In this version only the FLATEDECODE-filter is supported.
+ * This object is described in the 'Portable Document Format Reference Manual version 1.3' + * section 4.8 (page 41-53).
+ * + * @see PdfObject + * @see PdfDictionary + */ + +public class PdfStream extends PdfDictionary { + + // membervariables + +/** is the stream compressed? */ + protected boolean compressed = false; + + protected ByteArrayOutputStream streamBytes = null; + protected InputStream inputStream; + protected PdfIndirectReference ref; + protected int inputStreamLength = -1; + protected PdfWriter writer; + protected int rawLength; + + static final byte STARTSTREAM[] = DocWriter.getISOBytes("stream\n"); + static final byte ENDSTREAM[] = DocWriter.getISOBytes("\nendstream"); + static final int SIZESTREAM = STARTSTREAM.length + ENDSTREAM.length; + + // constructors + +/** + * Constructs a PdfStream-object. + * + * @param bytes content of the new PdfObject as an array of byte. + */ + + public PdfStream(byte[] bytes) { + super(); + type = STREAM; + this.bytes = bytes; + rawLength = bytes.length; + put(PdfName.LENGTH, new PdfNumber(bytes.length)); + } + + /** + * Creates an efficient stream. No temporary array is ever created. The InputStream + * is totally consumed but is not closed. The general usage is: + *

+ * 

+     * InputStream in = ...;
+     * PdfStream stream = new PdfStream(in, writer);
+     * stream.flateCompress();
+     * writer.addToBody(stream);
+     * stream.writeLength();
+     * in.close();
+     *
+ * @param inputStream the data to write to this stream + * @param writer the PdfWriter for this stream + */ + public PdfStream(InputStream inputStream, PdfWriter writer) { + super(); + type = STREAM; + this.inputStream = inputStream; + this.writer = writer; + ref = writer.getPdfIndirectReference(); + put(PdfName.LENGTH, ref); + } + +/** + * Constructs a PdfStream-object. + */ + + protected PdfStream() { + super(); + type = STREAM; + } + + /** + * Writes the stream length to the PdfWriter. + *

+ * This method must be called and can only be called if the contructor {@link #PdfStream(InputStream,PdfWriter)} + * is used to create the stream. + * @throws IOException on error + * @see #PdfStream(InputStream,PdfWriter) + */ + public void writeLength() throws IOException { + if (inputStream == null) + throw new UnsupportedOperationException("writeLength() can only be called in a contructed PdfStream(InputStream,PdfWriter)."); + if (inputStreamLength == -1) + throw new IOException("writeLength() can only be called after output of the stream body."); + writer.addToBody(new PdfNumber(inputStreamLength), ref, false); + } + + /** + * Gets the raw length of the stream. + * @return the raw length of the stream + */ + public int getRawLength() { + return rawLength; + } + + /** + * Compresses the stream. + */ + + public void flateCompress() { + if (!Document.compress) + return; + // check if the flateCompress-method has already been + if (compressed) { + return; + } + if (inputStream != null) { + compressed = true; + return; + } + // check if a filter already exists + PdfObject filter = get(PdfName.FILTER); + if (filter != null) { + if (filter.isName() && ((PdfName) filter).compareTo(PdfName.FLATEDECODE) == 0) { + return; + } + else if (filter.isArray() && ((PdfArray) filter).contains(PdfName.FLATEDECODE)) { + return; + } + else { + throw new RuntimeException("Stream could not be compressed: filter is not a name or array."); + } + } + try { + // compress + ByteArrayOutputStream stream = new ByteArrayOutputStream(); + DeflaterOutputStream zip = new DeflaterOutputStream(stream); + if (streamBytes != null) + streamBytes.writeTo(zip); + else + zip.write(bytes); + zip.close(); + // update the object + streamBytes = stream; + bytes = null; + put(PdfName.LENGTH, new PdfNumber(streamBytes.size())); + if (filter == null) { + put(PdfName.FILTER, PdfName.FLATEDECODE); + } + else { + PdfArray filters = new PdfArray(filter); + filters.add(PdfName.FLATEDECODE); + put(PdfName.FILTER, filters); + } + compressed = true; + } + catch(IOException ioe) { + throw new ExceptionConverter(ioe); + } + } + +// public int getStreamLength(PdfWriter writer) { +// if (dicBytes == null) +// toPdf(writer); +// if (streamBytes != null) +// return streamBytes.size() + dicBytes.length + SIZESTREAM; +// else +// return bytes.length + dicBytes.length + SIZESTREAM; +// } + + protected void superToPdf(PdfWriter writer, OutputStream os) throws IOException { + super.toPdf(writer, os); + } + + /** + * @see com.lowagie.text.pdf.PdfDictionary#toPdf(com.lowagie.text.pdf.PdfWriter, java.io.OutputStream) + */ + public void toPdf(PdfWriter writer, OutputStream os) throws IOException { + if (inputStream != null && compressed) + put(PdfName.FILTER, PdfName.FLATEDECODE); + superToPdf(writer, os); + os.write(STARTSTREAM); + PdfEncryption crypto = null; + if (writer != null) + crypto = writer.getEncryption(); + if (crypto != null) + crypto.prepareKey(); + if (inputStream != null) { + rawLength = 0; + DeflaterOutputStream def = null; + OutputStreamCounter osc = new OutputStreamCounter(os); + OutputStream fout = osc; + if (crypto != null) + fout = new PdfEncryptionStream(fout, crypto); + if (compressed) + fout = def = new DeflaterOutputStream(fout, new Deflater(Deflater.BEST_COMPRESSION), 0x8000); + + byte buf[] = new byte[0x10000]; + while (true) { + int n = inputStream.read(buf); + if (n <= 0) + break; + fout.write(buf, 0, n); + rawLength += n; + } + if (def != null) + def.finish(); + inputStreamLength = osc.getCounter(); + } + else { + if (crypto == null) { + if (streamBytes != null) + streamBytes.writeTo(os); + else + os.write(bytes); + } + else { + byte b[]; + if (streamBytes != null) { + b = streamBytes.toByteArray(); + crypto.encryptRC4(b); + } + else { + b = new byte[bytes.length]; + crypto.encryptRC4(bytes, b); + } + os.write(b); + } + } + os.write(ENDSTREAM); + } + + /** + * Writes the data content to an OutputStream. + * @param os the destination to write to + * @throws IOException on error + */ + public void writeContent(OutputStream os) throws IOException { + if (streamBytes != null) + streamBytes.writeTo(os); + else if (bytes != null) + os.write(bytes); + } +} \ No newline at end of file -- cgit v1.2.3