ItemData.cs

using System;
using System.Collections.Generic;
using Terraria;
using Terraria.ModLoader;

namespace MagicStorage
{
	public struct ItemData
	{
		public readonly int Type;
		public readonly int Prefix;

		public ItemData(int type, int prefix = 0)
		{
			this.Type = type;
			this.Prefix = prefix;
		}

		public ItemData(Item item)
		{
			this.Type = item.netID;
			this.Prefix = item.prefix;
		}

		public override bool Equals(Object other)
		{
			if (!(other is ItemData))
			{
				return false;
			}
			return Matches(this, (ItemData)other);
		}

		public override int GetHashCode()
		{
			return 100 * Type + Prefix;
		}

		public static bool Matches(Item item1, Item item2)
		{
			return Matches(new ItemData(item1), new ItemData(item2));
		}

		public static bool Matches(ItemData data1, ItemData data2)
		{
			return data1.Type == data2.Type && data1.Prefix == data2.Prefix;
		}

		public static int Compare(Item item1, Item item2)
		{
			ItemData data1 = new ItemData(item1);
			ItemData data2 = new ItemData(item2);
			if (data1.Type != data2.Type)
			{
				return data1.Type - data2.Type;
			}
			return data1.Prefix - data2.Prefix;
		}
	}
}