[Blank, Enums] Add "Blank" datitem for empty sets

SabreTools.Library/DatItems/Blank.cs

@@ -0,0 +1,85 @@
+using SabreTools.Library.Data;
+
+namespace SabreTools.Library.DatItems
+{
+	/// <summary>
+	/// Represents a blank set from an input DAT
+	/// </summary>
+	public class Blank : DatItem
+	{
+		#region Constructors
+
+		/// <summary>
+		/// Create a default, empty Archive object
+		/// </summary>
+		public Blank()
+		{
+			_name = "";
+			_itemType = ItemType.Blank;
+		}
+
+		#endregion
+
+		#region Cloning Methods
+
+		public override object Clone()
+		{
+			return new Blank()
+			{
+				Name = this.Name,
+				Type = this.Type,
+				Dupe = this.Dupe,
+
+				Supported = this.Supported,
+				Publisher = this.Publisher,
+				Infos = this.Infos,
+				PartName = this.PartName,
+				PartInterface = this.PartInterface,
+				Features = this.Features,
+				AreaName = this.AreaName,
+				AreaSize = this.AreaSize,
+
+				MachineName = this.MachineName,
+				Comment = this.Comment,
+				MachineDescription = this.MachineDescription,
+				Year = this.Year,
+				Manufacturer = this.Manufacturer,
+				RomOf = this.RomOf,
+				CloneOf = this.CloneOf,
+				SampleOf = this.SampleOf,
+				SourceFile = this.SourceFile,
+				Runnable = this.Runnable,
+				Board = this.Board,
+				RebuildTo = this.RebuildTo,
+				Devices = this.Devices,
+				MachineType = this.MachineType,
+
+				SystemID = this.SystemID,
+				System = this.System,
+				SourceID = this.SourceID,
+				Source = this.Source,
+			};
+		}
+
+		#endregion
+
+		#region Comparision Methods
+
+		public override bool Equals(DatItem other)
+		{
+			// If we don't have a blank, return false
+			if (_itemType != other.Type)
+			{
+				return false;
+			}
+
+			// Otherwise, treat it as a
+			Blank newOther = (Blank)other;
+
+			// If the archive information matches
+			return (_machine == newOther._machine);
+		}
+
+		#endregion
+	}
+}

SabreTools.Library/Data/Enums.cs

@@ -345,6 +345,8 @@
 		Release = 3,
 		BiosSet = 4,
 		Archive = 5,
+
+		Blank = 99, // This is not a real type, only used internally
 	}
 
 	#endregion

SabreTools.Library/SabreTools.Library.csproj

@@ -130,6 +130,7 @@
     <Compile Include="DatFiles\SabreDat.cs" />
     <Compile Include="DatFiles\SeparatedValue.cs" />
     <Compile Include="DatFiles\SoftwareList.cs" />
+    <Compile Include="DatItems\Blank.cs" />
     <Compile Include="FileTypes\CHDFile.cs" />
     <Compile Include="FileTypes\CoreRarArchive.cs" />
     <Compile Include="External\NaturalSort\NaturalComparer.cs" />