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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * 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;
    }

    private ZlibUtil() {
    }
}