com.l2jmobius.commons.network.codecs.CryptCodec.java Source code

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Here is the source code for com.l2jmobius.commons.network.codecs.CryptCodec.java

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/*
 * This file is part of the L2J Mobius project.
 * 
 * This program 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.
 * 
 * This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
 */
package com.l2jmobius.commons.network.codecs;

import java.util.List;

import com.l2jmobius.commons.network.ICrypt;

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

/**
 * @author Nos
 */
public class CryptCodec extends ByteToMessageCodec<ByteBuf> {
    private final ICrypt _crypt;

    public CryptCodec(ICrypt crypt) {
        super();
        _crypt = crypt;
    }

    /*
     * (non-Javadoc)
     * @see io.netty.handler.codec.ByteToMessageCodec#encode(io.netty.channel.ChannelHandlerContext, java.lang.Object, io.netty.buffer.ByteBuf)
     */
    @Override
    protected void encode(ChannelHandlerContext ctx, ByteBuf msg, ByteBuf out) {
        // Check if there are any data to encrypt.
        if (!msg.isReadable()) {
            return;
        }

        msg.resetReaderIndex();
        _crypt.encrypt(msg);
        msg.resetReaderIndex();
        out.writeBytes(msg);
    }

    /*
     * (non-Javadoc)
     * @see io.netty.handler.codec.ByteToMessageCodec#decode(io.netty.channel.ChannelHandlerContext, io.netty.buffer.ByteBuf, java.util.List)
     */
    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) {
        in.resetReaderIndex();
        _crypt.decrypt(in);
        in.readerIndex(in.writerIndex());
        out.add(in.copy(0, in.writerIndex()));
    }
}