/*
* This file is part of Vanilla.
*
* Copyright (c) 2011 Spout LLC <http://www.spout.org/>
* Vanilla is licensed under the Spout License Version 1.
*
* Vanilla is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option)
* any later version.
*
* In addition, 180 days after any changes are published, you can use the
* software, incorporating those changes, under the terms of the MIT license,
* as described in the Spout License Version 1.
*
* Vanilla 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 Lesser General Public License for
* more details.
*
* You should have received a copy of the GNU Lesser General Public License,
* the MIT license and the Spout License Version 1 along with this program.
* If not, see <http://www.gnu.org/licenses/> for the GNU Lesser General Public
* License and see <http://spout.in/licensev1> for the full license, including
* the MIT license.
*/
package org.spout.vanilla.protocol.rcon.codec;
import java.nio.ByteOrder;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.util.CharsetUtil;
import org.spout.api.protocol.MessageCodec;
import org.spout.vanilla.protocol.rcon.msg.RconMessage;
/**
* Base class for MessageCodecs using rcon
*/
public abstract class RconCodec<T extends RconMessage> extends MessageCodec<T> {
public RconCodec(Class<T> clazz, int opcode) {
super(clazz, opcode);
}
@Override
public ByteBuf encode(T message) {
byte[] bytes = message.getPayload().getBytes(CharsetUtil.US_ASCII);
ByteBuf buffer = Unpooled.buffer(bytes.length + 2);
buffer.order(ByteOrder.LITTLE_ENDIAN);
buffer.writeBytes(bytes);
buffer.writeByte(0);
buffer.writeByte(0);
return buffer;
}
@Override
public T decode(ByteBuf buffer) {
buffer.order(ByteOrder.LITTLE_ENDIAN);
ByteBuf expandingBytes = Unpooled.buffer(buffer.writerIndex());
byte b;
while ((b = buffer.readByte()) != 0) {
expandingBytes.writeByte(b);
}
assert buffer.readByte() == 0; // Second null byte
String value = new String(expandingBytes.array(), CharsetUtil.US_ASCII);
return createMessage(value);
}
public abstract T createMessage(String payload);
}