/* * $Id: PRStream.java,v 1.13 2002/11/19 08:33:35 blowagie Exp $ * $Name:  $ * * 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.*;import com.lowagie.text.ExceptionConverter;import java.util.zip.DeflaterOutputStream;import com.lowagie.text.Document;/** * a Literal */public class PRStream extends PdfStream {        protected PdfReader reader;    protected int offset;    protected int length;        public PRStream(PdfReader reader, int offset)    {        this.reader = reader;        this.offset = offset;    }        public PRStream(PdfReader reader, byte conts[])    {        this.reader = reader;        this.offset = -1;        if (Document.compress) {            try {                ByteArrayOutputStream stream = new ByteArrayOutputStream();                DeflaterOutputStream zip = new DeflaterOutputStream(stream);                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);    }        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 int getStreamLength(PdfWriter writer) {        if (dicBytes == null)            toPdf(writer);        return length + dicBytes.length + SIZESTREAM;    }        void writeTo(OutputStream out, PdfWriter writer) throws IOException{        if (dicBytes == null)            toPdf(writer);        out.write(dicBytes);        out.write(STARTSTREAM);        if (length > 0) {            PdfEncryption crypto = writer.getEncryption();            if (offset < 0) {                if (crypto == null)                    out.write(bytes);                else {                    crypto.prepareKey();                    byte buf[] = new byte[length];                    System.arraycopy(bytes, 0, buf, 0, length);                    crypto.encryptRC4(buf);                    out.write(buf);                }            }            else {                byte buf[] = new byte[Math.min(length, 4092)];                RandomAccessFileOrArray file = writer.getReaderFile(reader);                file.seek(offset);                int size = length;                if (crypto != null)                    crypto.prepareKey();                while (size > 0) {                    int r = file.read(buf, 0, Math.min(size, buf.length));                    size -= r;                    if (crypto != null)                        crypto.encryptRC4(buf, 0, r);                    out.write(buf, 0, r);                }            }        }        out.write(ENDSTREAM);    }}