Simple Base64 string decoding function : Base64 « Development Class « Java






  1. Java
  2. Development Class
  3. Base64

Simple Base64 string decoding function

     
/*
 * 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();
    }

}








Related examples in the same category

1.Base64 encoding/decoding.
2.Decodes Base64 data into octects
3.Implementation of MIME's Base64 encoding and decoding conversions.
4.Encode/decode for RFC 2045 Base64 as defined by RFC 2045
5.Encode/decode for RFC 2045 Base64 as defined by RFC 2045, N. Freed and N. Borenstein.
6.Encodes and decodes to and from Base64 notation.
7.Encodes hex octects into Base64
8.Helper class to provide Base64 encoding routines.
9.Represents a collection of 64 boolean (on/off) flags.
10.byte to be tested if it is Base64 alphabet
11.to Base64
12.One of the fastest implementation of the Base64 encoding. Jakarta and others are slower
13.array of byte to encode
14.Codes number up to radix 62
15.A Base64 Encoder/Decoder
16.A fast and memory efficient class to encode and decode to and from BASE64 in full accordance with RFC 2045
17.BASE64 encoder implementation
18.Base-64 Encoder - translates from base-64 text into binary
19.Base64 Character encoder as specified in RFC1113
20.Base64 Utils
21.Base64 encoder/decoder
22.Base64 from by Funambol, Inc.
23.Convert to hex from byte arrays and back
24.Converting hexadecimal strings
25.Encode and decode data in Base64 format as described in RFC 1521
26.Encode and decode integers, times, and internationalized strings to and from popular binary formats
27.Encoding of raw bytes to base64-encoded characters, and decoding of base64 characters to raw bytes
28.Performs Base64 encoding and/or decoding
29.Provides Base64 encoding and decoding as defined by RFC 2045
30.Provides Base64 encoding and decoding with URL and filename safe alphabet as defined by RFC 3548, section 4.
31.Provides utility methods to Base64 encode data
32.QP Decoder Stream
33.QP Encoder Stream
34.A class to decode Base64 streams and strings.
35.A class to encode Base64 streams and strings.
36.Encodes binary data to plain text as Base64
37.A very fast and memory efficient class to encode and decode to and from BASE64 in full accordance with RFC 2045.
38.Decodes InputStreams which contain binary data in base64 form
39.Base 64 Converter
40.Base64 from org.cspoker.common.util
41.Base64 converted from code at http://iharder.sourceforge.net/base64/
42.Encodes and decodes to and from Base64 notation.
43.Class to represent unsigned 64-bit numbers.
44.A Base64 encoder/decoder.
45.The Base64 utility class implements Base-64 and Base-85 encoding and decoding algorithms.
46.Provides Base64 encoding and decoding
47.Code to read and write Base64-encoded text.
48.Base32 encoding/decoding class.