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

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Here is the source code for org.jfxvnc.net.rfb.codec.decoder.ColourMapEntriesDecoder.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.List;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;

class ColourMapEntriesDecoder implements FrameDecoder {

    protected ByteBuf colorBuf;

    private int firstColor;
    private int numberOfColor;

    public ColourMapEntriesDecoder() {
    }

    @Override
    public boolean decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {

        if (colorBuf == null) {
            if (!in.isReadable(12)) {
                return false;
            }
            in.skipBytes(2);
            firstColor = in.readUnsignedShort();
            numberOfColor = in.readUnsignedShort();
            int size = numberOfColor - firstColor;
            colorBuf = Unpooled.buffer(size * 6, size * 6);
        }
        colorBuf.writeBytes(in);

        if (!colorBuf.isWritable()) {
            return out.add(new ColourMapEntriesEvent(firstColor, numberOfColor, colorBuf));
        }
        return false;
    }

}