Organized the project files.

And also fixed some bugs.

PriFileFormat/DataItemSection.cs

@@ -0,0 +1,71 @@
+using System.Collections.Generic;
+using System.IO;
+using System.Runtime.InteropServices;
+namespace PriFileFormat
+{
+	public class DataItemSection: Section
+	{
+		private List<ByteSpan> _dataItems;
+		public IReadOnlyList<ByteSpan> DataItems
+		{
+			get { return _dataItems; }
+		}
+		internal const string Identifier = "[mrm_dataitem] \0";
+		internal DataItemSection (PriFile priFile) : base (Identifier, priFile)
+		{
+		}
+		protected override bool ParseSectionContent (BinaryReader binaryReader)
+		{
+			long sectionPosition = (binaryReader.BaseStream as SubStream)?.SubStreamPosition ?? 0;
+			binaryReader.ExpectUInt32 (0);
+			ushort numStrings = binaryReader.ReadUInt16 ();
+			ushort numBlobs = binaryReader.ReadUInt16 ();
+			uint totalDataLength = binaryReader.ReadUInt32 ();
+			List <ByteSpan> dataItems = new List<ByteSpan> (numStrings + numBlobs);
+			long dataStartOffset = binaryReader.BaseStream.Position +
+				numStrings * 2 * sizeof (ushort) + numBlobs * 2 * sizeof (uint);
+
+			for (int i = 0; i < numStrings; i++)
+			{
+				ushort stringOffset = binaryReader.ReadUInt16 ();
+				ushort stringLength = binaryReader.ReadUInt16 ();
+				dataItems.Add (new ByteSpan (sectionPosition + dataStartOffset + stringOffset, stringLength));
+			}
+
+			for (int i = 0; i < numBlobs; i++)
+			{
+				uint blobOffset = binaryReader.ReadUInt32 ();
+				uint blobLength = binaryReader.ReadUInt32 ();
+				dataItems.Add (new ByteSpan (sectionPosition + dataStartOffset + blobOffset, blobLength));
+			}
+
+			_dataItems = dataItems;
+
+			return true;
+		}
+		public void ClearData ()
+		{
+			_dataItems?.Clear ();
+			_dataItems = null;
+		}
+		~DataItemSection () { ClearData (); }
+	}
+
+	public struct DataItemRef
+	{
+		internal SectionRef<DataItemSection> dataItemSection;
+		internal int itemIndex;
+
+		internal DataItemRef (SectionRef<DataItemSection> dataItemSection, int itemIndex)
+		{
+			this.dataItemSection = dataItemSection;
+			this.itemIndex = itemIndex;
+		}
+
+		public override string ToString ()
+		{
+			return $"Data item {itemIndex} in section {dataItemSection.sectionIndex}";
+		}
+	}
+
+}