package net.mcft.copy.betterstorage.container;

import net.mcft.copy.betterstorage.block.crate.CratePileData;
import net.mcft.copy.betterstorage.inventory.InventoryCratePlayerView;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.inventory.ICrafting;
import net.minecraft.inventory.Slot;
import net.minecraft.item.ItemStack;
import net.minecraft.network.packet.Packet;
import net.minecraft.network.packet.Packet103SetSlot;

public class ContainerCrate extends ContainerBetterStorage {
	
	private EntityPlayer player;
	private InventoryCratePlayerView playerView;
	
	private int lastFullness = 0;
	private int fullness = 0;
	
	public ContainerCrate(EntityPlayer player, InventoryCratePlayerView inventory) {
		super(player, inventory, 9, inventory.getSizeInventory() / 9);
		
		this.player = player;
		this.playerView = inventory;
		
		CratePileData data = inventory.data;
		fullness = data.getOccupiedSlots() * 255 / data.getCapacity();
	}
	
	@Override
	public void detectAndSendChanges() {
		super.detectAndSendChanges();
		
		CratePileData data = playerView.data;
		fullness = data.getOccupiedSlots() * 255 / data.getCapacity();
		
		if (lastFullness != fullness)
			for (Object c : crafters)
				((ICrafting)c).sendProgressBarUpdate(this, 0, fullness);
		
		lastFullness = fullness;
	}
	
	@Override
	public ItemStack transferStackInSlot(EntityPlayer player, int slotId) {
		Slot slot = (Slot)inventorySlots.get(slotId);
		ItemStack stackBefore = slot.getStack();
		if (stackBefore != null) stackBefore.copy();
		// If slot isn't empty and item can be stacked.
		if ((slot != null) && slot.getHasStack()) {
			ItemStack slotStack = slot.getStack();
			// If slot is in the container inventory, try to transfer the item to the player.
			if (slotId < playerView.getSizeInventory()) {
				int count = slotStack.stackSize;
				mergeItemStack(slotStack, playerView.getSizeInventory(), inventorySlots.size(), true);
				int amount = count - slotStack.stackSize;
				slotStack.stackSize = count;
				playerView.decrStackSize(slotId, amount);
			// If slot is in the player inventory, try to transfer the item to the container.
			} else {
				ItemStack overflow = playerView.data.addItems(slotStack);
				slot.putStack(overflow);
				// Send slot contents to player.
				Packet packet = new Packet103SetSlot(player.openContainer.windowId, slotId, overflow);
				((EntityPlayerMP)player).playerNetServerHandler.sendPacketToPlayer(packet);
				// If there's overflow, return null because otherwise, retrySlotClick
				// will be called and there's going to be an infinite loop.
				// This kills the game.
				if (overflow != null)
					return null;
			}
		}
		return stackBefore;
	}
	
}

package net.mcft.copy.betterstorage.container;

import net.mcft.copy.betterstorage.block.crate.CratePileData;
import net.mcft.copy.betterstorage.inventory.InventoryCratePlayerView;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.inventory.ICrafting;
import net.minecraft.inventory.Slot;
import net.minecraft.item.ItemStack;
import net.minecraft.network.packet.Packet;
import net.minecraft.network.packet.Packet103SetSlot;

public class ContainerCrate extends ContainerBetterStorage {
	
	private EntityPlayer player;
	private InventoryCratePlayerView playerView;
	
	private int lastFullness = 0;
	private int fullness = 0;
	
	public ContainerCrate(EntityPlayer player, InventoryCratePlayerView inventory) {
		super(player, inventory, 9, inventory.getSizeInventory() / 9);
		
		this.player = player;
		this.playerView = inventory;
		
		CratePileData data = inventory.data;
		fullness = data.getOccupiedSlots() * 255 / data.getCapacity();
	}
	
	@Override
	public void detectAndSendChanges() {
		super.detectAndSendChanges();
		
		CratePileData data = playerView.data;
		// detectAndSendChanges gets called after a crate gets broken.
		// So to prevent a division by zero, just return.
		if (data.getNumCrates() <= 0) return;
		fullness = data.getOccupiedSlots() * 255 / data.getCapacity();
		
		if (lastFullness != fullness)
			for (Object c : crafters)
				((ICrafting)c).sendProgressBarUpdate(this, 0, fullness);
		
		lastFullness = fullness;
	}
	
	@Override
	public ItemStack transferStackInSlot(EntityPlayer player, int slotId) {
		Slot slot = (Slot)inventorySlots.get(slotId);
		ItemStack stackBefore = slot.getStack();
		if (stackBefore != null) stackBefore.copy();
		// If slot isn't empty and item can be stacked.
		if ((slot != null) && slot.getHasStack()) {
			ItemStack slotStack = slot.getStack();
			// If slot is in the container inventory, try to transfer the item to the player.
			if (slotId < playerView.getSizeInventory()) {
				int count = slotStack.stackSize;
				mergeItemStack(slotStack, playerView.getSizeInventory(), inventorySlots.size(), true);
				int amount = count - slotStack.stackSize;
				slotStack.stackSize = count;
				playerView.decrStackSize(slotId, amount);
			// If slot is in the player inventory, try to transfer the item to the container.
			} else {
				ItemStack overflow = playerView.data.addItems(slotStack);
				slot.putStack(overflow);
				// Send slot contents to player.
				Packet packet = new Packet103SetSlot(player.openContainer.windowId, slotId, overflow);
				((EntityPlayerMP)player).playerNetServerHandler.sendPacketToPlayer(packet);
				// If there's overflow, return null because otherwise, retrySlotClick
				// will be called and there's going to be an infinite loop.
				// This kills the game.
				if (overflow != null)
					return null;
			}
		}
		return stackBefore;
	}
	
}

Fix ArithmeticException in ContainerCrate