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

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Here is the source code for org.jfxvnc.net.rfb.codec.decoder.ProtocolVersionDecoder.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.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.List;

import org.jfxvnc.net.rfb.codec.ProtocolVersion;

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

public class ProtocolVersionDecoder extends ByteToMessageDecoder {

    protected final Charset ASCII = StandardCharsets.US_ASCII;

    private final int length = 12;

    public ProtocolVersionDecoder() {
        setSingleDecode(true);
    }

    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
        if (!in.isReadable(length)) {
            return;
        }
        byte[] rfb = new byte[length];
        in.readBytes(rfb);
        String rfbVersion = new String(rfb, ASCII);
        out.add(new ProtocolVersion(rfbVersion));
        ctx.pipeline().remove(this);
    }

}