com.vethrfolnir.game.network.mu.packets.MuReadPacket.java Source code

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Here is the source code for com.vethrfolnir.game.network.mu.packets.MuReadPacket.java

Source

/**
 * Copyright (C) 2013-2014 Project-Vethrfolnir
 *
 * 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.vethrfolnir.game.network.mu.packets;

import java.io.UnsupportedEncodingException;
import java.nio.ByteOrder;

import io.netty.buffer.ByteBuf;

import com.vethrfolnir.game.network.mu.MuClient;
import com.vethrfolnir.network.NetworkClient;
import com.vethrfolnir.network.ReadPacket;

/**
 * @author Vlad
 *
 */
public abstract class MuReadPacket extends ReadPacket {

    public abstract void read(MuClient client, ByteBuf buff, Object... params);

    @Override
    public final void read(NetworkClient context, ByteBuf buff, Object... params) {
        read((MuClient) context, buff, params);
    }

    /* (non-Javadoc)
     * @see com.vethrfolnir.network.ReadPacket#readS(io.netty.buffer.ByteBuf)
     */
    @Override
    protected String readS(ByteBuf buff) {
        return readS(buff, buff.readableBytes());
    }

    protected String readS(ByteBuf buff, int max) {
        try {
            ByteBuf copy = buff.readBytes(max);
            String str = new String(copy.array(), "ISO-8859-1");
            copy.release();
            return str.trim();
        } catch (UnsupportedEncodingException e) {
            log.warn("Failed reading string!", e);
        }

        return null;
    }

    protected int readD(ByteBuf buff, ByteOrder order) {
        switch (order.toString()) {
        case "BIG_ENDIAN": {
            int a = buff.readUnsignedByte() << 8;
            int b = buff.readUnsignedByte() << 16;
            int c = buff.readUnsignedByte() << 32;
            int d = buff.readUnsignedByte() & 0xFF;
            return (a | b | c | d);
        }
        case "LITTLE_ENDIAN": {
            int a = buff.readUnsignedByte() & 0xFF;
            int b = buff.readUnsignedByte() << 32;
            int c = buff.readUnsignedByte() << 16;
            int d = buff.readUnsignedByte() << 8;
            return (a | b | c | d);
        }
        }

        throw new RuntimeException("Order: " + order + " is not mapped!");
    }

    protected int readSh(ByteBuf buff, ByteOrder order) {

        switch (order.toString()) {
        case "BIG_ENDIAN": {
            int a = buff.readUnsignedByte() << 8;
            int b = buff.readUnsignedByte() & 0xFF;
            return (a | b);
        }
        case "LITTLE_ENDIAN": {
            int a = buff.readUnsignedByte() & 0xFF;
            int b = buff.readUnsignedByte() << 8;
            return (a | b);
        }
        }

        throw new RuntimeException("Order: " + order + " is not mapped!");
    }

    protected void shiftC(ByteBuf buff, int pos) {
        byte b = buff.array()[pos];
        b &= 0x7F;
        b |= 0x80;
        buff.array()[pos] = b;
    }
}