Mega Code Archive
Simple Base64 string decoding function
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/*
* Copyright 2000-2001,2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jetspeed.util;
import javax.mail.internet.MimeUtility;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
/**
* Simple Base64 string decoding function
* @author Jason Borden <jborden@javasense.com>
*
* This class was copied from the jakarta-james project.
* The only change made, besides comments, is the package name.
* This class orgininated in org.apache.james.util as version 1.3
* which was committed by darrel on 2002/01/18 02:48:39
*
* $Id: Base64.java,v 1.5 2004/02/23 03:23:42 jford Exp $
* Committed on $Date: 2004/02/23 03:23:42 $ by: $Name: JETSPEED-RELEASE-1-5 $
*/
public class Base64 {
public static String decodeAsString(String b64string) throws Exception
{
return new String(decodeAsByteArray(b64string));
}
public static byte[] decodeAsByteArray(String b64string) throws Exception
{
InputStream in = MimeUtility.decode(new ByteArrayInputStream(
b64string.getBytes()), "base64");
ByteArrayOutputStream out = new ByteArrayOutputStream();
while(true)
{
int b = in.read();
if (b == -1) break;
else out.write(b);
}
return out.toByteArray();
}
public static String encodeAsString(String plaintext) throws Exception
{
return encodeAsString(plaintext.getBytes());
}
public static String encodeAsString(byte[] plaindata) throws Exception
{
ByteArrayOutputStream out = new ByteArrayOutputStream();
ByteArrayOutputStream inStream = new ByteArrayOutputStream();
inStream.write(plaindata, 0, plaindata.length);
// pad
if ((plaindata.length % 3 ) == 1)
{
inStream.write(0);
inStream.write(0);
}
else if((plaindata.length % 3 ) == 2)
{
inStream.write(0);
}
inStream.writeTo(MimeUtility.encode(out, "base64"));
return out.toString();
}
}
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