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Itext is a java library to create and manipulate PDFs. This is a fork of version 2.1.7 the last MPL/LGPL version. It's focused basically on mantain compatibility with newer bouncycastle releases and small bugfixes.

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/*
 * Copyright 2003 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;

/**
 * Classes implementing this interface can create custom encodings or
 * replace existing ones. It is used in the context of PdfEncoding.
 * @author Paulo Soares ([email protected])
 */
public interface ExtraEncoding {
    
    /**
     * Converts an Unicode string to a byte array according to some encoding.
     * @param text the Unicode string
     * @param encoding the requested encoding. It's mainly of use if the same class
     * supports more than one encoding.
     * @return the conversion or null if no conversion is supported
     */    
    public byte[] charToByte(String text, String encoding);
    
    /**
     * Converts an Unicode char to a byte array according to some encoding.
     * @param char1 the Unicode char
     * @param encoding the requested encoding. It's mainly of use if the same class
     * supports more than one encoding.
     * @return the conversion or null if no conversion is supported
     */    
    public byte[] charToByte(char char1, String encoding);
    
    /**
     * Converts a byte array to an Unicode string according to some encoding.
     * @param b the input byte array
     * @param encoding the requested encoding. It's mainly of use if the same class
     * supports more than one encoding.
     * @return the conversion or null if no conversion is supported
     */
    public String byteToChar(byte b[], String encoding);   
}