DeflateEncoder.java — netty Source File

Source Code

/*
 * Copyright 2014 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:
 *
 *   https://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 io.netty.handler.codec.http.websocketx.extensions.compression;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.CompositeByteBuf;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.embedded.EmbeddedChannel;
import io.netty.handler.codec.CodecException;
import io.netty.handler.codec.compression.ZlibCodecFactory;
import io.netty.handler.codec.compression.ZlibWrapper;
import io.netty.handler.codec.http.websocketx.BinaryWebSocketFrame;
import io.netty.handler.codec.http.websocketx.ContinuationWebSocketFrame;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketFrame;
import io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionEncoder;
import io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionFilter;

import java.util.List;

import static io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateDecoder.*;
import static io.netty.util.internal.ObjectUtil.*;

/**
 * Deflate implementation of a payload compressor for
 * <tt>io.netty.handler.codec.http.websocketx.WebSocketFrame</tt>.
 */
abstract class DeflateEncoder extends WebSocketExtensionEncoder {

    private final int compressionLevel;
    private final int windowSize;
    private final boolean noContext;
    private final WebSocketExtensionFilter extensionEncoderFilter;

    private EmbeddedChannel encoder;

    /**
     * Constructor
     * @param compressionLevel compression level of the compressor.
     * @param windowSize maximum size of the window compressor buffer.
     * @param noContext true to disable context takeover.
     * @param extensionEncoderFilter extension encoder filter.
     */
    DeflateEncoder(int compressionLevel, int windowSize, boolean noContext,
                   WebSocketExtensionFilter extensionEncoderFilter) {
        this.compressionLevel = compressionLevel;
// ... (109 more lines)