org.jfxvnc.net.rfb.codec.decoder.FrameDecoderHandler.java Source code

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Here is the source code for org.jfxvnc.net.rfb.codec.decoder.FrameDecoderHandler.java

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/*******************************************************************************
 * Copyright (c) 2016 comtel inc.
 *
 * Licensed 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.jfxvnc.net.rfb.codec.decoder;

import java.util.EnumMap;
import java.util.List;

import org.jfxvnc.net.rfb.codec.Encoding;
import org.jfxvnc.net.rfb.codec.PixelFormat;
import org.jfxvnc.net.rfb.codec.ServerEvent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;

public class FrameDecoderHandler extends ByteToMessageDecoder {
    private static Logger logger = LoggerFactory.getLogger(FrameDecoderHandler.class);

    private final EnumMap<ServerEvent, FrameDecoder> frameDecoder = new EnumMap<>(ServerEvent.class);

    enum State {
        NEXT, FRAME
    }

    private State state = State.NEXT;

    private ServerEvent serverEvent;

    public FrameDecoderHandler(PixelFormat pixelFormat) {

        frameDecoder.put(ServerEvent.SET_COLOR_MAP_ENTRIES, new ColourMapEntriesDecoder());
        frameDecoder.put(ServerEvent.BELL, new BellDecoder());
        frameDecoder.put(ServerEvent.SERVER_CUT_TEXT, new ServerCutTextDecoder());
        frameDecoder.put(ServerEvent.FRAMEBUFFER_UPDATE, new FramebufferUpdateRectDecoder(pixelFormat));
    }

    public Encoding[] getSupportedEncodings() {
        return ((FramebufferUpdateRectDecoder) frameDecoder.get(ServerEvent.FRAMEBUFFER_UPDATE))
                .getSupportedEncodings();
    }

    public boolean isPixelFormatSupported() {
        return ((FramebufferUpdateRectDecoder) frameDecoder.get(ServerEvent.FRAMEBUFFER_UPDATE))
                .isPixelFormatSupported();
    }

    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
        if (!in.isReadable()) {
            return;
        }

        FrameDecoder decoder;
        switch (state) {
        case NEXT:
            serverEvent = ServerEvent.valueOf(in.getUnsignedByte(0));
            decoder = frameDecoder.get(serverEvent);

            if (decoder == null) {
                logger.error("not handled server message type: {} ({})", serverEvent, in.getUnsignedByte(0));
                in.skipBytes(in.readableBytes());
                return;
            }
            if (!decoder.decode(ctx, in, out)) {
                state = State.FRAME;
            }
        case FRAME:
            decoder = frameDecoder.get(serverEvent);

            if (decoder == null) {
                logger.error("not handled server message type: {} ({})", serverEvent, in.getUnsignedByte(0));
                in.skipBytes(in.readableBytes());
                return;
            }
            if (decoder.decode(ctx, in, out)) {
                state = State.NEXT;
            }
            break;
        default:
            logger.warn("unknown state: {}", state);
            break;
        }
    }

}