Organized the project files.

And also fixed some bugs.

PriFileFormat/Replenish.cs

@@ -0,0 +1,55 @@
+using System.IO;
+using System.Text;
+using System.Runtime.InteropServices;
+namespace PriFileFormat
+{
+	internal static class Replenish
+	{
+		public static string ReadString (this BinaryReader reader, Encoding encoding, int length)
+		{
+			using (BinaryReader r = new BinaryReader (reader.BaseStream, encoding, true))
+				return new string (r.ReadChars (length));
+		}
+
+		public static string ReadNullTerminatedString (this BinaryReader reader, Encoding encoding)
+		{
+			using (BinaryReader r = new BinaryReader (reader.BaseStream, encoding, true))
+			{
+				StringBuilder result = new StringBuilder ();
+				char c;
+				while ((c = r.ReadChar ()) != '\0')
+					result.Append (c);
+				return result.ToString ();
+			}
+		}
+
+		public static void ExpectByte (this BinaryReader reader, byte expectedValue)
+		{
+			if (reader.ReadByte () != expectedValue)
+				throw new InvalidDataException ("Unexpected value read.");
+		}
+
+		public static void ExpectUInt16 (this BinaryReader reader, ushort expectedValue)
+		{
+			if (reader.ReadUInt16 () != expectedValue)
+				throw new InvalidDataException ("Unexpected value read.");
+		}
+
+		public static void ExpectUInt32 (this BinaryReader reader, uint expectedValue)
+		{
+			if (reader.ReadUInt32 () != expectedValue)
+				throw new InvalidDataException ("Unexpected value read.");
+		}
+
+		public static void ExpectString (this BinaryReader reader, string s)
+		{
+			if (new string (reader.ReadChars (s.Length)) != s)
+				throw new InvalidDataException ("Unexpected value read.");
+		}
+		public static string Limit (this string s, int length)
+		{
+			if (string.IsNullOrEmpty (s)) return s;
+			return s.Length <= length ? s : s.Substring (0, length);
+		}
+	}
+}