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Java > Open Source Codes > org > apache > geronimo > util > encoders > UrlBase64Encoder


1 /**
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements. See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License. You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17
18 package org.apache.geronimo.util.encoders;
19
20 /**
21  * Convert binary data to and from UrlBase64 encoding. This is identical to
22  * Base64 encoding, except that the padding character is "." and the other
23  * non-alphanumeric characters are "-" and "_" instead of "+" and "/".
24  * <p>
25  * The purpose of UrlBase64 encoding is to provide a compact encoding of binary
26  * data that is safe for use as an URL parameter. Base64 encoding does not
27  * produce encoded values that are safe for use in URLs, since "/" can be
28  * interpreted as a path delimiter; "+" is the encoded form of a space; and
29  * "=" is used to separate a name from the corresponding value in an URL
30  * parameter.
31  */
32 public class UrlBase64Encoder extends Base64Encoder
33 {
34     public UrlBase64Encoder()
35     {
36         encodingTable[encodingTable.length - 2] = (byte) '-';
37         encodingTable[encodingTable.length - 1] = (byte) '_';
38         padding = (byte) '.';
39         // we must re-create the decoding table with the new encoded values.
40 initialiseDecodingTable();
41     }
42 }
43
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