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Diffstat (limited to 'src/main/java/com/lowagie/text/pdf/PdfStream.java')
| -rw-r--r-- | src/main/java/com/lowagie/text/pdf/PdfStream.java | 313 |
1 files changed, 313 insertions, 0 deletions
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;
+
+/**
+ * <CODE>PdfStream</CODE> is the Pdf stream object.
+ * <P>
+ * 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.<BR>
+ * A stream consists of a dictionary that describes a sequence of characters, followed by
+ * the keyword <B>stream</B>, followed by zero or more lines of characters, followed by
+ * the keyword <B>endstream</B>.<BR>
+ * All streams must be <CODE>PdfIndirectObject</CODE>s. The stream dictionary must be a direct
+ * object. The keyword <B>stream</B> that follows the stream dictionary should be followed by
+ * a carriage return and linefeed or just a linefeed.<BR>
+ * Remark: In this version only the FLATEDECODE-filter is supported.<BR>
+ * This object is described in the 'Portable Document Format Reference Manual version 1.3'
+ * section 4.8 (page 41-53).<BR>
+ *
+ * @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 <CODE>PdfStream</CODE>-object.
+ *
+ * @param bytes content of the new <CODE>PdfObject</CODE> as an array of <CODE>byte</CODE>.
+ */
+
+ 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 <CODE>InputStream</CODE>
+ * is totally consumed but is not closed. The general usage is:
+ * <p>
+ * <pre>
+ * InputStream in = ...;
+ * PdfStream stream = new PdfStream(in, writer);
+ * stream.flateCompress();
+ * writer.addToBody(stream);
+ * stream.writeLength();
+ * in.close();
+ * </pre>
+ * @param inputStream the data to write to this stream
+ * @param writer the <CODE>PdfWriter</CODE> 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 <CODE>PdfStream</CODE>-object.
+ */
+
+ protected PdfStream() {
+ super();
+ type = STREAM;
+ }
+
+ /**
+ * Writes the stream length to the <CODE>PdfWriter</CODE>.
+ * <p>
+ * 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 <CODE>OutputStream</CODE>.
+ * @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);
+ }
+}
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