View Javadoc

1   /*
2    * ====================================================================
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *   http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing,
14   * software distributed under the License is distributed on an
15   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16   * KIND, either express or implied.  See the License for the
17   * specific language governing permissions and limitations
18   * under the License.
19   * ====================================================================
20   *
21   * This software consists of voluntary contributions made by many
22   * individuals on behalf of the Apache Software Foundation.  For more
23   * information on the Apache Software Foundation, please see
24   * <http://www.apache.org/>.
25   *
26   */
27  package org.apache.http.impl.auth;
28  
29  import java.io.IOException;
30  import java.io.OutputStream;
31  import java.security.MessageDigest;
32  
33  class HttpEntityDigester extends OutputStream {
34  
35      private final MessageDigest digester;
36      private boolean closed;
37      private byte[] digest;
38  
39      HttpEntityDigester(final MessageDigest digester) {
40          super();
41          this.digester = digester;
42          this.digester.reset();
43      }
44  
45      @Override
46      public void write(final int b) throws IOException {
47          if (this.closed) {
48              throw new IOException("Stream has been already closed");
49          }
50          this.digester.update((byte) b);
51      }
52  
53      @Override
54      public void write(final byte[] b, final int off, final int len) throws IOException {
55          if (this.closed) {
56              throw new IOException("Stream has been already closed");
57          }
58          this.digester.update(b, off, len);
59      }
60  
61      @Override
62      public void close() throws IOException {
63          if (this.closed) {
64              return;
65          }
66          this.closed = true;
67          this.digest = this.digester.digest();
68          super.close();
69      }
70  
71      public byte[] getDigest() {
72          return this.digest;
73      }
74  
75  }