org.jboss.netty.handler.codec.compression.ZlibUtil Maven / Gradle / Ivy
/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package org.jboss.netty.handler.codec.compression;
import org.jboss.netty.util.internal.jzlib.JZlib;
import org.jboss.netty.util.internal.jzlib.ZStream;
/**
* Utility methods used by {@link ZlibEncoder} and {@link ZlibDecoder}.
*/
final class ZlibUtil {
static void fail(ZStream z, String message, int resultCode) {
throw exception(z, message, resultCode);
}
static CompressionException exception(ZStream z, String message, int resultCode) {
return new CompressionException(message + " (" + resultCode + ')' +
(z.msg != null? ": " + z.msg : ""));
}
static Enum convertWrapperType(ZlibWrapper wrapper) {
Enum convertedWrapperType;
switch (wrapper) {
case NONE:
convertedWrapperType = JZlib.W_NONE;
break;
case ZLIB:
convertedWrapperType = JZlib.W_ZLIB;
break;
case GZIP:
convertedWrapperType = JZlib.W_GZIP;
break;
case ZLIB_OR_NONE:
convertedWrapperType = JZlib.W_ZLIB_OR_NONE;
break;
default:
throw new Error();
}
return convertedWrapperType;
}
static int wrapperOverhead(ZlibWrapper wrapper) {
int overhead;
switch (wrapper) {
case NONE:
overhead = 0;
break;
case ZLIB:
case ZLIB_OR_NONE:
overhead = 2;
break;
case GZIP:
overhead = 10;
break;
default:
throw new Error();
}
return overhead;
}
private ZlibUtil() {
}
}