com.rs3e.network.protocol.codec.js5.UpdateEncoder.java Source code

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Here is the source code for com.rs3e.network.protocol.codec.js5.UpdateEncoder.java

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/*
 * This file is part of Ieldor.
 *
 * Ieldor is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Ieldor is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Ieldor.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.rs3e.network.protocol.codec.js5;

import com.rs3e.network.protocol.codec.ondemand.FileResponse;

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

/**
 * An {@link ByteToByteEncoder} that is used to handle the update encoding.
 * 
 * @author Thomas Le Godais <thomaslegodais@live.com>
 * 
 */
public class UpdateEncoder extends MessageToByteEncoder<FileResponse> {

    /**
     * Constructs a new {@code UpdateEncoder} instance.
     */
    public UpdateEncoder() {
        super(FileResponse.class);
    }

    /*
     * (non-Javadoc)
     * 
     * @see io.netty.handler.codec.MessageToByteEncoder#encode(io.netty.channel.
     * ChannelHandlerContext, java.lang.Object, io.netty.buffer.ByteBuf)
     */
    @Override
    public void encode(ChannelHandlerContext ctx, FileResponse response, ByteBuf buf) throws Exception {
        ByteBuf container = response.getContainer();
        int type = response.getType();
        int file = response.getFile();

        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;
        }

        buf.writeByte(type);
        buf.writeInt(file);
        buf.writeByte(compression);
        buf.writeInt(size);

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

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

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

        }
    }
}