Base64


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  import java.io.ByteArrayOutputStream  ;
21  import java.io.IOException  ;
22  import java.io.OutputStream  ;
23  
24  public class Base64
25  {
26      private static final Encoder encoder = new Base64Encoder();
27  
28      /**
29       * encode the input data producing a base 64 encoded byte array.
30       *
31       * @return a byte array containing the base 64 encoded data.
32       */
33      public static byte[] encode(
34          byte[]    data)
35      {
36          ByteArrayOutputStream      bOut = new ByteArrayOutputStream  ();
37  
38          try
39          {
40              encoder.encode(data, 0, data.length, bOut);
41          }
42          catch (IOException   e)
43          {
44              throw new RuntimeException  ("exception encoding base64 string: " + e);
45          }
46  
47          return bOut.toByteArray();
48      }
49  
50      /**
51       * Encode the byte data to base 64 writing it to the given output stream.
52       *
53       * @return the number of bytes produced.
54       */
55      public static int encode(
56          byte[]                data,
57          OutputStream      out)
58          throws IOException  
59      {
60          return encoder.encode(data, 0, data.length, out);
61      }
62  
63      /**
64       * Encode the byte data to base 64 writing it to the given output stream.
65       *
66       * @return the number of bytes produced.
67       */
68      public static int encode(
69          byte[]                data,
70          int                    off,
71          int                    length,
72          OutputStream      out)
73          throws IOException  
74      {
75          return encoder.encode(data, off, length, out);
76      }
77  
78      /**
79       * decode the base 64 encoded input data. It is assumed the input data is valid.
80       *
81       * @return a byte array representing the decoded data.
82       */
83      public static byte[] decode(
84          byte[]    data)
85      {
86          ByteArrayOutputStream      bOut = new ByteArrayOutputStream  ();
87  
88          try
89          {
90              encoder.decode(data, 0, data.length, bOut);
91          }
92          catch (IOException   e)
93          {
94              throw new RuntimeException  ("exception decoding base64 string: " + e);
95          }
96  
97          return bOut.toByteArray();
98      }
99  
100     /**
101      * decode the base 64 encoded String data - whitespace will be ignored.
102      *
103      * @return a byte array representing the decoded data.
104      */
105     public static byte[] decode(
106         String      data)
107     {
108         ByteArrayOutputStream      bOut = new ByteArrayOutputStream  ();
109 
110         try
111         {
112             encoder.decode(data, bOut);
113         }
114         catch (IOException   e)
115         {
116             throw new RuntimeException  ("exception decoding base64 string: " + e);
117         }
118 
119         return bOut.toByteArray();
120     }
121 
122     /**
123      * decode the base 64 encoded String data writing it to the given output stream,
124      * whitespace characters will be ignored.
125      *
126      * @return the number of bytes produced.
127      */
128     public static int decode(
129         String                  data,
130         OutputStream      out)
131         throws IOException  
132     {
133         return encoder.decode(data, out);
134     }
135 }
136
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