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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.http;
17  
18  import org.jboss.netty.buffer.ChannelBuffer;
19  import org.jboss.netty.handler.codec.compression.ZlibDecoder;
20  import org.jboss.netty.handler.codec.compression.ZlibWrapper;
21  import org.jboss.netty.handler.codec.embedder.DecoderEmbedder;
22  
23  /**
24   * Decompresses an {@link HttpMessage} and an {@link HttpChunk} compressed in
25   * {@code gzip} or {@code deflate} encoding.  For more information on how this
26   * handler modifies the message, please refer to {@link HttpContentDecoder}.
27   */
28  public class HttpContentDecompressor extends HttpContentDecoder {
29      @Override
30      protected DecoderEmbedder<ChannelBuffer> newContentDecoder(String contentEncoding) throws Exception {
31          if ("gzip".equalsIgnoreCase(contentEncoding) || "x-gzip".equalsIgnoreCase(contentEncoding)) {
32              return new DecoderEmbedder<ChannelBuffer>(new ZlibDecoder(ZlibWrapper.GZIP));
33          }
34          if ("deflate".equalsIgnoreCase(contentEncoding) || "x-deflate".equalsIgnoreCase(contentEncoding)) {
35              // To be strict, 'deflate' means ZLIB, but some servers were not implemented correctly.
36              return new DecoderEmbedder<ChannelBuffer>(new ZlibDecoder(ZlibWrapper.ZLIB_OR_NONE));
37          }
38  
39          // 'identity' or unsupported
40          return null;
41      }
42  }