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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          super();
    60      }
    61
    62      /**
    63       * Creates a new instance with the specified parameters.
    64       */
    65      public RtspRequestDecoder(int maxInitialLineLength, int maxHeaderSize, int maxContentLength) {
    66          super(maxInitialLineLength, maxHeaderSize, maxContentLength);
    67      }
    68
    69      @Override
    70      protected HttpMessage createMessage(String[] initialLine) throws Exception {
    71          return new DefaultHttpRequest(RtspVersions.valueOf(initialLine[2]),
    72                  RtspMethods.valueOf(initialLine[0]), initialLine[1]);
    73      }
    74
    75      @Override
    76      protected boolean isDecodingRequest() {
    77          return true;
    78      }
    79  }