WebSocket00FrameDecoder.java — netty Source File

Source Code

/*
 * Copyright 2019 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;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ReplayingDecoder;
import io.netty.handler.codec.TooLongFrameException;
import io.netty.util.internal.ObjectUtil;

import java.util.List;

import static io.netty.buffer.ByteBufUtil.readBytes;

/**
 * Decodes {@link ByteBuf}s into {@link WebSocketFrame}s.
 * <p>
 * For the detailed instruction on adding add Web Socket support to your HTTP server, take a look into the
 * <tt>WebSocketServer</tt> example located in the {@code io.netty.example.http.websocket} package.
 */
public class WebSocket00FrameDecoder extends ReplayingDecoder<Void> implements WebSocketFrameDecoder {

    static final int DEFAULT_MAX_FRAME_SIZE = 16384;

    private final long maxFrameSize;
    private boolean receivedClosingHandshake;

    public WebSocket00FrameDecoder() {
        this(DEFAULT_MAX_FRAME_SIZE);
    }

    /**
     * Creates a new instance of {@code WebSocketFrameDecoder} with the specified {@code maxFrameSize}. If the client
     * sends a frame size larger than {@code maxFrameSize}, the channel will be closed.
     *
     * @param maxFrameSize
     *            the maximum frame size to decode
     */
    public WebSocket00FrameDecoder(int maxFrameSize) {
        this.maxFrameSize = maxFrameSize;
    }

    /**
     * Creates a new instance of {@code WebSocketFrameDecoder} with the specified {@code maxFrameSize}. If the client
     * sends a frame size larger than {@code maxFrameSize}, the channel will be closed.
     *
     * @param decoderConfig
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