diff --git a/src/BsDiffTool/Program.cs b/src/BsDiffTool/Program.cs
index b2fdac0..afdb380 100644
--- a/src/BsDiffTool/Program.cs
+++ b/src/BsDiffTool/Program.cs
@@ -1,9 +1,8 @@
-using System.Diagnostics;
 using BsDiff;
 
 namespace BsDiffTool
 {
-	class Program
+	public sealed class Program
 	{
 		public static void Main(string[] args)
 		{
@@ -14,102 +13,19 @@ public static void Main(string[] args)
 				return;
 			}
 
-			// check for special command-line switch that performs a self-test
-			if (args[0] == "--check")
-				CheckImplementation(args[1], args[2]);
-			else
-			{
-				var oldFile = args[0];
-				var newFile = args[1];
-				var patchFile = args[2];
-
-				try
-				{
-					using (var output = new FileStream(patchFile, FileMode.Create))
-						BinaryPatch.Create(File.ReadAllBytes(oldFile), File.ReadAllBytes(newFile), output);
-				}
-				catch (FileNotFoundException ex)
-				{
-					Console.Error.WriteLine("Could not open '{0}'.", ex.FileName);
-				}
-			}
-		}
-
-		// Creates a patch for oldFile and newFile with the reference C implementation and this C# code, then verifies that
-		// the patch applies correctly.
-		private static void CheckImplementation(string oldFile, string newFile)
-		{
-			// to test, download bsdiff and bspatch for Windows, e.g., from http://sites.inka.de/tesla/others.html#bsdiff
-			const string bsdiffPath = @"C:\Util\bsdiff.exe";
-			const string rbspatchPath = @"C:\Util\bspatch.exe";
-
-			var tempPath = Path.GetTempPath();
-			var referencePatchFileName = Path.Combine(tempPath, "reference.patch");
-			var portPatchFileName = Path.Combine(tempPath, "port.patch");
+			var oldFile = args[0];
+			var newFile = args[1];
+			var patchFile = args[2];
 
-			// run reference implementation
-			var referenceTime = Stopwatch.StartNew();
-			using (var process = Process.Start(bsdiffPath, QuotePaths(oldFile, newFile, referencePatchFileName)))
+			try
 			{
-				process.WaitForExit();
-				referenceTime.Stop();
+				using (var output = new FileStream(patchFile, FileMode.Create))
+					BinaryPatch.Create(File.ReadAllBytes(oldFile), File.ReadAllBytes(newFile), output);
 			}
-
-			// run C# implementation
-			var portTime = Stopwatch.StartNew();
-			using (var output = new FileStream(portPatchFileName, FileMode.Create))
-				BinaryPatch.Create(File.ReadAllBytes(oldFile), File.ReadAllBytes(newFile), output);
-			portTime.Stop();
-
-			Console.WriteLine("Patches created in {0} (reference) and {1} (C# port).", referenceTime.Elapsed, portTime.Elapsed);
-			Console.WriteLine("File sizes (in bytes) are {0:n0} (reference) and {1:n0} (C# port).", new FileInfo(referencePatchFileName).Length, new FileInfo(portPatchFileName).Length);
-
-			var outputFilePaths = new[] { "test-ref-ref.dat", "test-prt-ref.dat", "test-ref-prt.dat", "test-prt-prt.dat" }
-				.Select(fn => Path.Combine(tempPath, fn))
-				.ToArray();
-
-			Console.Write("Applying reference patch with reference binary...");
-			using (var process = Process.Start(rbspatchPath, QuotePaths(oldFile, outputFilePaths[0], referencePatchFileName)))
-				process.WaitForExit();
-			Console.WriteLine("done.");
-
-			Console.Write("Applying port patch with reference binary...");
-			using (var process = Process.Start(rbspatchPath, QuotePaths(oldFile, outputFilePaths[1], portPatchFileName)))
-				process.WaitForExit();
-			Console.WriteLine("done.");
-
-			Console.Write("Applying reference patch with port binary...");
-			using (var input = new FileStream(oldFile, FileMode.Open, FileAccess.Read, FileShare.Read))
-			using (var output = new FileStream(outputFilePaths[2], FileMode.Create))
-				BinaryPatch.Apply(input, () => new FileStream(referencePatchFileName, FileMode.Open, FileAccess.Read, FileShare.Read), output);
-			Console.WriteLine("done.");
-
-			Console.Write("Applying port patch with port binary...");
-			using (var input = new FileStream(oldFile, FileMode.Open, FileAccess.Read, FileShare.Read))
-			using (var output = new FileStream(outputFilePaths[3], FileMode.Create))
-				BinaryPatch.Apply(input, () => new FileStream(portPatchFileName, FileMode.Open, FileAccess.Read, FileShare.Read), output);
-			Console.WriteLine("done.");
-
-			var errors = 0;
-			var expectedOutput = File.ReadAllBytes(newFile);
-			foreach (var filePath in outputFilePaths)
+			catch (FileNotFoundException ex)
 			{
-				var actualOutput = File.ReadAllBytes(filePath);
-				if (!expectedOutput.SequenceEqual(actualOutput))
-				{
-					Console.Error.WriteLine("Incorrect results in {0}.", Path.GetFileName(filePath));
-					errors++;
-				}
+				Console.Error.WriteLine("Could not open '{0}'.", ex.FileName);
 			}
-
-			if (errors == 0)
-				Console.WriteLine("All patches are correct.");
-		}
-
-		// Returns a single string that contains all paths quoted and joined with spaces.
-		private static string QuotePaths(params string[] paths)
-		{
-			return "\"" + string.Join("\" \"", paths) + "\"";
 		}
 	}
 }
diff --git a/src/BsPatchTool/Program.cs b/src/BsPatchTool/Program.cs
index 79966b9..57663bb 100644
--- a/src/BsPatchTool/Program.cs
+++ b/src/BsPatchTool/Program.cs
@@ -2,9 +2,9 @@
 
 namespace BsPatchTool;
 
-class Program
+public sealed class Program
 {
-	static void Main(string[] args)
+	public static void Main(string[] args)
 	{
 		// check for correct usage
 		if (args.Length != 3)