org.legacy.network.protocol.ondemand.OnDemandEncoder.java Source code

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Here is the source code for org.legacy.network.protocol.ondemand.OnDemandEncoder.java

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/**
 * Copyright (c) 2014 Legacy 814
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package org.legacy.network.protocol.ondemand;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;

import org.legacy.network.protocol.messages.OnDemandResponseMessage;

/**
 * @author Im Frizzy <skype:kfriz1998>
 * @since Jul 14, 2014
 */
public class OnDemandEncoder extends MessageToByteEncoder<OnDemandResponseMessage> {

    /* (non-Javadoc)
     * @see io.netty.handler.codec.MessageToByteEncoder#encode(io.netty.channel.ChannelHandlerContext, java.lang.Object, io.netty.buffer.ByteBuf)
     */
    @Override
    protected void encode(ChannelHandlerContext ctx, OnDemandResponseMessage msg, ByteBuf out) throws Exception {
        OnDemandResponseMessage response = (OnDemandResponseMessage) msg;
        ByteBuf container = response.getContainer();
        int index = response.getType();
        int file = response.getFile();
        ByteBuf buffer = Unpooled.buffer();
        int compression = container.readUnsignedByte();
        int size = ((container.readByte() & 0xff) << 24) + ((container.readByte() & 0xff) << 16)
                + ((container.readByte() & 0xff) << 8) + (container.readByte() & 0xff);
        if (!response.isPriority()) {
            file |= 0x80000000;
        }

        buffer.writeByte(index);
        buffer.writeInt(file);
        buffer.writeByte(compression);
        buffer.writeInt(size);

        int bytes = container.readableBytes();
        if (bytes > 502) {
            bytes = 502;
        }

        buffer.writeBytes(container.readBytes(bytes));

        for (;;) {
            bytes = container.readableBytes();
            if (bytes == 0) {
                break;
            } else if (bytes > 507) {
                bytes = 507;
            }
            buffer.writeByte(index);
            buffer.writeInt(file);
            buffer.writeBytes(container.readBytes(bytes));
        }
    }

}