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 }