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1   /*
2    * Copyright 2012 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package org.jboss.netty.handler.codec.rtsp;
17  
18  import org.jboss.netty.buffer.ChannelBuffer;
19  import org.jboss.netty.handler.codec.frame.TooLongFrameException;
20  import org.jboss.netty.handler.codec.http.DefaultHttpRequest;
21  import org.jboss.netty.handler.codec.http.HttpMessage;
22  import org.jboss.netty.handler.codec.http.HttpRequest;
23  
24  /**
25   * Decodes {@link ChannelBuffer}s into RTSP requests represented in
26   * {@link HttpRequest}s.
27   * <p>
28   * <h3>Parameters that prevents excessive memory consumption</h3>
29   * <table border="1">
30   * <tr>
31   * <th>Name</th><th>Meaning</th>
32   * </tr>
33   * <tr>
34   * <td>{@code maxInitialLineLength}</td>
35   * <td>The maximum length of the initial line (e.g. {@code "SETUP / RTSP/1.0"})
36   *     If the length of the initial line exceeds this value, a
37   *     {@link TooLongFrameException} will be raised.</td>
38   * </tr>
39   * <tr>
40   * <td>{@code maxHeaderSize}</td>
41   * <td>The maximum length of all headers.  If the sum of the length of each
42   *     header exceeds this value, a {@link TooLongFrameException} will be raised.</td>
43   * </tr>
44   * <tr>
45   * <td>{@code maxContentLength}</td>
46   * <td>The maximum length of the content.  If the content length exceeds this
47   *     value, a {@link TooLongFrameException} will be raised.</td>
48   * </tr>
49   * </table>
50   */
51  public class RtspRequestDecoder extends RtspMessageDecoder {
52  
53      /**
54       * Creates a new instance with the default
55       * {@code maxInitialLineLength (4096}}, {@code maxHeaderSize (8192)}, and
56       * {@code maxContentLength (8192)}.
57       */
58      public RtspRequestDecoder() {
59      }
60  
61      /**
62       * Creates a new instance with the specified parameters.
63       */
64      public RtspRequestDecoder(int maxInitialLineLength, int maxHeaderSize, int maxContentLength) {
65          super(maxInitialLineLength, maxHeaderSize, maxContentLength);
66      }
67  
68      @Override
69      protected HttpMessage createMessage(String[] initialLine) throws Exception {
70          return new DefaultHttpRequest(RtspVersions.valueOf(initialLine[2]),
71                  RtspMethods.valueOf(initialLine[0]), initialLine[1]);
72      }
73  
74      @Override
75      protected boolean isDecodingRequest() {
76          return true;
77      }
78  }