Someone

	public double calcArmorWastage(L2Character attacker, L2PcInstance target, double mobDamage, boolean shield)
	{
		double wastage = 0;
		double armorShield = shield ? 1 : 0;
		
		int[] slots = { L2Item.SLOT_HEAD, 
				L2Item.SLOT_LEGS, 
				L2Item.SLOT_FEET, 
				L2Item.SLOT_GLOVES, 
				L2Item.SLOT_FULL_ARMOR, 
				L2Item.SLOT_L_HAND }; 

		for (int slotId = 0; slotId < slots.length; slotId++)
		{
			L2ItemInstance item = target.getInventory().getPaperdollItem(slots[slotId]);
	
			if (item != null)
			{
				if (slots[slotId] == L2Item.SLOT_L_HAND && 
					item.getItemType() != L2WeaponType.NONE)
				{
					continue;
				}
				
				L2ItemInstance weaponItem = attacker.getActiveWeaponInstance();
				double weaponMaterial = 0;
				double weaponTyp = 0;
				
				if (weaponItem != null)
				{
					weaponMaterial = Util.getMaterialValue(weaponItem);
					weaponTyp = Util.getWeaponType(weaponItem);
				}
				
				double armorMaterial = Util.getMaterialValue(item);
				
				wastage += (item.getPDef() * (0.1 + armorShield + armorMaterial)) / (mobDamage * (weaponMaterial + weaponTyp));
			}
		}
		
		return wastage;
	}