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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.DefaultHttpResponse;
    21  import org.jboss.netty.handler.codec.http.HttpMessage;
    22  import org.jboss.netty.handler.codec.http.HttpResponse;
    23  import org.jboss.netty.handler.codec.http.HttpResponseStatus;
    24
    25  /**
    26   * Decodes {@link ChannelBuffer}s into RTSP responses represented in
    27   * {@link HttpResponse}s.
    28   * <p>
    29   * <h3>Parameters that prevents excessive memory consumption</h3>
    30   * <table border="1">
    31   * <tr>
    32   * <th>Name</th><th>Meaning</th>
    33   * </tr>
    34   * <tr>
    35   * <td>{@code maxInitialLineLength}</td>
    36   * <td>The maximum length of the initial line (e.g. {@code "RTSP/1.0 200 OK"})
    37   *     If the length of the initial line exceeds this value, a
    38   *     {@link TooLongFrameException} will be raised.</td>
    39   * </tr>
    40   * <tr>
    41   * <td>{@code maxHeaderSize}</td>
    42   * <td>The maximum length of all headers.  If the sum of the length of each
    43   *     header exceeds this value, a {@link TooLongFrameException} will be raised.</td>
    44   * </tr>
    45   * <tr>
    46   * <td>{@code maxContentLength}</td>
    47   * <td>The maximum length of the content.  If the content length exceeds this
    48   *     value, a {@link TooLongFrameException} will be raised.</td>
    49   * </tr>
    50   * </table>
    51   */
    52  public class RtspResponseDecoder extends RtspMessageDecoder {
    53
    54      /**
    55       * Creates a new instance with the default
    56       * {@code maxInitialLineLength (4096}}, {@code maxHeaderSize (8192)}, and
    57       * {@code maxContentLength (8192)}.
    58       */
    59      public RtspResponseDecoder() {
    60          super();
    61      }
    62
    63      /**
    64       * Creates a new instance with the specified parameters.
    65       */
    66      public RtspResponseDecoder(int maxInitialLineLength, int maxHeaderSize,
    67              int maxContentLength) {
    68          super(maxInitialLineLength, maxHeaderSize, maxContentLength);
    69      }
    70
    71      @Override
    72      protected HttpMessage createMessage(String[] initialLine) throws Exception {
    73          return new DefaultHttpResponse(
    74                  RtspVersions.valueOf(initialLine[0]),
    75                  new HttpResponseStatus(Integer.valueOf(initialLine[1]), initialLine[2]));
    76      }
    77
    78      @Override
    79      protected boolean isDecodingRequest() {
    80          return false;
    81      }
    82  }