SetPrivateStoreListBuy issue

/*
 * 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 net.sf.l2j.gameserver.network.clientpackets;

import net.sf.l2j.Config;
import net.sf.l2j.gameserver.model.TradeList;
import net.sf.l2j.gameserver.model.actor.L2Character;
import net.sf.l2j.gameserver.model.actor.instance.L2PcInstance;
import net.sf.l2j.gameserver.network.SystemMessageId;
import net.sf.l2j.gameserver.network.serverpackets.PrivateStoreManageListBuy;
import net.sf.l2j.gameserver.network.serverpackets.PrivateStoreMsgBuy;
import net.sf.l2j.gameserver.network.serverpackets.SystemMessage;
import net.sf.l2j.gameserver.taskmanager.AttackStanceTaskManager;

public final class SetPrivateStoreListBuy extends L2GameClientPacket
{
    private static final int BATCH_LENGTH = 12; // length of one item

    private Item[] _items = null;

    @Override
    protected void readImpl()
    {
        int count = readD();
        if (count < 1 || count > Config.MAX_ITEM_IN_PACKET || count * BATCH_LENGTH != _buf.remaining())
            return;

        _items = new Item[count];
        for (int i = 0; i < count; i++)
        {
            int itemId = readD();
            readH(); //TODO analyse this
            readH(); //TODO analyse this
            long cnt = readD();
            int price = readD();

            if (itemId < 1 || cnt < 1 || price < 0)
            {
                _items = null;
                return;
            }
            _items[i] = new Item(itemId, (int)cnt, price);
        }
    }

    @Override
    protected void runImpl()
    {
        L2PcInstance player = getClient().getActiveChar();
        if (player == null)
            return;

        if (_items == null)
        {
            player.setPrivateStoreType(L2PcInstance.STORE_PRIVATE_NONE);
            player.broadcastUserInfo();
            player.sendPacket(new PrivateStoreManageListBuy(player));
            return;
        }

        if (!player.getAccessLevel().allowTransaction())
        {
            player.sendPacket(new SystemMessage(SystemMessageId.YOU_ARE_NOT_AUTHORIZED_TO_DO_THAT));
            return;
        }

        if (AttackStanceTaskManager.getInstance().getAttackStanceTask(player)
            || (player.isCastingNow() || player.isCastingSimultaneouslyNow())
            || player.isInDuel())
        {
            player.sendPacket(new SystemMessage(SystemMessageId.YOU_ARE_NOT_AUTHORIZED_TO_DO_THAT));
            player.sendPacket(new PrivateStoreManageListBuy(player));
            return;
        }

        if (player.isInsideZone(L2Character.ZONE_NOSTORE))
        {
            player.sendPacket(new SystemMessage(SystemMessageId.NO_PRIVATE_STORE_HERE));
            player.sendPacket(new PrivateStoreManageListBuy(player));
            return;
        }

        TradeList tradeList = player.getBuyList();
        tradeList.clear();

        // Check maximum number of allowed slots for pvt shops
        if (_items.length > player.getPrivateBuyStoreLimit())
        {
            player.sendPacket(new SystemMessage(SystemMessageId.YOU_HAVE_EXCEEDED_QUANTITY_THAT_CAN_BE_INPUTTED));
            player.sendPacket(new PrivateStoreManageListBuy(player));
            return;
        }

        int totalCost = 0;
        for (Item i : _items)
        {
            if (!i.addToTradeList(tradeList))
            {
                player.sendPacket(new SystemMessage(SystemMessageId.EXCEEDED_THE_MAXIMUM));
                player.sendPacket(new PrivateStoreManageListBuy(player));
                return;
            }

            totalCost += i.getCost();
            if (totalCost > Integer.MAX_VALUE)
            {
                player.sendPacket(new SystemMessage(SystemMessageId.EXCEEDED_THE_MAXIMUM));
                player.sendPacket(new PrivateStoreManageListBuy(player));
                return;
            }
        }

        // Check for available funds
        if (totalCost > player.getAdena())
        {
            player.sendPacket(new SystemMessage(SystemMessageId.THE_PURCHASE_PRICE_IS_HIGHER_THAN_MONEY));
            player.sendPacket(new PrivateStoreManageListBuy(player));
            return;
        }

        player.sitDown();
        player.setPrivateStoreType(L2PcInstance.STORE_PRIVATE_BUY);
        player.broadcastUserInfo();
        player.broadcastPacket(new PrivateStoreMsgBuy(player));
    }

    private static class Item
    {
        private final int _itemId, _count, _price;

        public Item(int id, int num, int pri)
        {
            _itemId = id;
            _count = num;
            _price = pri;
        }

        public boolean addToTradeList(TradeList list)
        {
            if ((Integer.MAX_VALUE / _count) < _price)
                return false;

            list.addItemByItemId(_itemId, _count, _price);
            return true;
        }

        public long getCost()
        {
            return _count * _price;
        }
    }

    @Override
    public String getType()
    {
        return "[C] 91 SetPrivateStoreListBuy";
    }
}