/*
 * $Id: PdfEncryptionStream.java,v 1.3 2005/02/17 09:20:54 blowagie Exp $
 * $Name:  $
 *
 * Copyright 2004 Paulo Soares
 *
 *
 * 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) 1999-2005 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000-2005 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) 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.
 * 
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA  02110-1301, USA.
 *
 *
 * 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.FilterOutputStream;
import java.io.OutputStream;
import java.io.IOException;

public class PdfEncryptionStream extends FilterOutputStream {
    
    protected PdfEncryption enc;
    private byte buf[] = new byte[1];
    
    public PdfEncryptionStream(OutputStream out, PdfEncryption enc) {
        super(out);
        this.enc = enc;
    }
    
    public void write(byte[] b, int off, int len) throws IOException {
        if ((off | len | (b.length - (len + off)) | (off + len)) < 0)
            throw new IndexOutOfBoundsException();
        enc.encryptRC4(b, off, len);
        out.write(b, off, len);
    }
    
    public void close() throws IOException {
    }
    
    public void write(int b) throws IOException {
        buf[0] = (byte)b;
        write(buf);
    }
    
    public void flush() throws IOException {
    }
    
}
