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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.compression;
17  
18  import org.jboss.netty.util.internal.jzlib.JZlib;
19  import org.jboss.netty.util.internal.jzlib.ZStream;
20  
21  /**
22   * Utility methods used by {@link ZlibEncoder} and {@link ZlibDecoder}.
23   *
24   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
25   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
26   * @version $Rev: 2080 $, $Date: 2010-01-26 18:04:19 +0900 (Tue, 26 Jan 2010) $
27   */
28  final class ZlibUtil {
29  
30      static void fail(ZStream z, String message, int resultCode) {
31          throw exception(z, message, resultCode);
32      }
33  
34      static CompressionException exception(ZStream z, String message, int resultCode) {
35          return new CompressionException(message + " (" + resultCode + ")" +
36                  (z.msg != null? ": " + z.msg : ""));
37      }
38  
39      static Enum<?> convertWrapperType(ZlibWrapper wrapper) {
40          Enum<?> convertedWrapperType;
41          switch (wrapper) {
42          case NONE:
43              convertedWrapperType = JZlib.W_NONE;
44              break;
45          case ZLIB:
46              convertedWrapperType = JZlib.W_ZLIB;
47              break;
48          case GZIP:
49              convertedWrapperType = JZlib.W_GZIP;
50              break;
51          case ZLIB_OR_NONE:
52              convertedWrapperType = JZlib.W_ZLIB_OR_NONE;
53              break;
54          default:
55              throw new Error();
56          }
57          return convertedWrapperType;
58      }
59  
60      private ZlibUtil() {
61          super();
62      }
63  }