public ItemStack transferStackInSlot(EntityPlayer par1EntityPlayer, int par2)
    {
        ItemStack itemstack = null;
        Slot slot = (Slot) this.inventorySlots.get(par2);

        if (slot != null && slot.getHasStack())
        {
            ItemStack itemstack1 = slot.getStack();
            itemstack = itemstack1.copy();

            if (par2 == 36 || par2 == 37)
            {
                if (!this.mergeItemStack(itemstack1, 27, 36, false))
                {
                    if (!this.mergeItemStack(itemstack1, 0, 27, false))
                        return null;
                }
                slot.onSlotChange(itemstack1, itemstack);
            }
            if (par2 < 37)
            {
                if (TilePowderAggregator.getItemBurnTime(itemstack) > 0)
                {
                    if (!this.mergeItemStack(itemstack1, 36, 37, false))
                        return null;
                    slot.onSlotChange(itemstack1, itemstack);
                }
                else if (par2 < 27)
                {
                    if (!this.mergeItemStack(itemstack1, 27, 36, false))
                        return null;
                    slot.onSlotChange(itemstack1, itemstack);
                }
                else if (par2 > 26 && par2 < 36)
                {
                    if (!this.mergeItemStack(itemstack1, 0, 26, false))
                        return null;
                    slot.onSlotChange(itemstack1, itemstack);
                }
            }

            if (itemstack1.stackSize == 0)
            {
                slot.putStack((ItemStack) null);
            }
            else
            {
                slot.onSlotChanged();
            }
            if (itemstack1.stackSize == itemstack.stackSize)
            {
                return null;
            }
            slot.onPickupFromSlot(par1EntityPlayer, itemstack1);
        }

        if (itemstack.stackSize == 0)
            return null;
        return itemstack;
    }