/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000-2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache", "Jakarta", "JAMES" and "Apache Software Foundation"
 *    must not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * Portions of this software are based upon public domain software
 * originally written at the National Center for Supercomputing Applications,
 * University of Illinois, Urbana-Champaign.
 */

package org.apache.james.util;

import javax.mail.internet.MimeUtility;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStreamReader;


/**
 * Simple Base64 string decoding function
 * @author Jason Borden <jborden@javasense.com>
 *
 * @version This is $Revision: 1.1 $
 */

public class Base64 {

    public static BufferedReader decode(String b64string) throws Exception {
        return new BufferedReader(
                   new InputStreamReader(
                       MimeUtility.decode(
                            new ByteArrayInputStream(
                                b64string.getBytes()), "base64")));
    }

    public static String decodeAsString(String b64string) throws Exception {
        if (b64string == null) {
            return b64string;
        }
        String returnString = decode(b64string).readLine();
        if (returnString == null) {
            return returnString;
        }
        return returnString.trim();
    }

    public static ByteArrayOutputStream encode(String plaintext)
            throws Exception {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        byte[] in = plaintext.getBytes();
        ByteArrayOutputStream inStream = new ByteArrayOutputStream();
        inStream.write(in, 0, in.length);
        // pad
        if ((in.length % 3 ) == 1){
            inStream.write(0);
            inStream.write(0);
        } else if((in.length % 3 ) == 2){
            inStream.write(0);
        }
        inStream.writeTo( MimeUtility.encode(out, "base64")  );
        return out;
    }

    public static String encodeAsString(String plaintext) throws Exception {
        return  encode(plaintext).toString();
    }


}