1 /*
2 * Copyright 2009 Red Hat, Inc.
3 *
4 * Red Hat licenses this file to you under the Apache License, version 2.0
5 * (the "License"); you may not use this file except in compliance with the
6 * 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 * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
29 * @author <a href="http://gleamynode.net/">Trustin Lee</a>
30 * @version $Rev: 2121 $, $Date: 2010-02-02 09:38:07 +0900 (Tue, 02 Feb 2010) $
31 */
32 public class HttpContentDecompressor extends HttpContentDecoder {
33 @Override
34 protected DecoderEmbedder<ChannelBuffer> newContentDecoder(String contentEncoding) throws Exception {
35 if ("gzip".equalsIgnoreCase(contentEncoding) || "x-gzip".equalsIgnoreCase(contentEncoding)) {
36 return new DecoderEmbedder<ChannelBuffer>(new ZlibDecoder(ZlibWrapper.GZIP));
37 } else if ("deflate".equalsIgnoreCase(contentEncoding) || "x-deflate".equalsIgnoreCase(contentEncoding)) {
38 // To be strict, 'deflate' means ZLIB, but some servers were not implemented correctly.
39 return new DecoderEmbedder<ChannelBuffer>(new ZlibDecoder(ZlibWrapper.ZLIB_OR_NONE));
40 }
41
42 // 'identity' or unsupported
43 return null;
44 }
45 }