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1   /*
2    * ====================================================================
3    *
4    *  Licensed to the Apache Software Foundation (ASF) under one or more
5    *  contributor license agreements.  See the NOTICE file distributed with
6    *  this work for additional information regarding copyright ownership.
7    *  The ASF licenses this file to You under the Apache License, Version 2.0
8    *  (the "License"); you may not use this file except in compliance with
9    *  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, software
14   *  distributed under the License is distributed on an "AS IS" BASIS,
15   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16   *  See the License for the specific language governing permissions and
17   *  limitations under the License.
18   * ====================================================================
19   *
20   * This software consists of voluntary contributions made by many
21   * individuals on behalf of the Apache Software Foundation.  For more
22   * information on the Apache Software Foundation, please see
23   * <http://www.apache.org/>.
24   *
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(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(byte[] b, int off, 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  }