diff --git a/Base16384.Net.csproj b/Base16384.Net.csproj
index 3f5a9cf..ecc0ec6 100644
--- a/Base16384.Net.csproj
+++ b/Base16384.Net.csproj
@@ -5,6 +5,7 @@
 		<ImplicitUsings>enable</ImplicitUsings>
 		<Nullable>enable</Nullable>
 		<Version>2.0.0.0</Version>
+		<Platforms>x64</Platforms>
 	</PropertyGroup>
 	<ItemGroup>
 		<PackageReference Include="LC6464.Base16384" Version="2.1.0" />
diff --git a/Helpers.cs b/Helpers.cs
index d6eab76..c41cbb3 100644
--- a/Helpers.cs
+++ b/Helpers.cs
@@ -1,31 +1,50 @@
-namespace ConsoleHelpers;
+using System.Diagnostics.CodeAnalysis;
+
+namespace ConsoleHelpers;
 
 public static class Helpers {
-	public static int WriteToStdOut<T>(Func<T, Stream, long> func, T input, Stream? stdout = null) {
-		try {
-			stdout ??= Console.OpenStandardOutput();
-			try {
-				func(input, stdout);
-			} catch {
-				return 4;
-			} finally {
-				stdout.Dispose();
-			}
-		} catch {
-			return 3;
+	public static readonly string? debugEnv = Environment.GetEnvironmentVariable("Base16384_Net_Debug");
+	public static readonly bool DEBUG = debugEnv is not null && debugEnv.ToLower() is not "false" and not "0";
+
+
+	public static int PrintErrorMessage(string? message, string? debugMessage = null, int exitCode = 0) {
+		if (message is not null) {
+			Console.WriteLine(message);
 		}
-		return 0;
+		if (DEBUG && !string.IsNullOrWhiteSpace(debugMessage)) {
+			Console.Error.WriteLine(debugMessage);
+		}
+		return exitCode;
 	}
 
-	public static int WriteToFile<T>(Func<T, FileInfo, long> func, T input, string inputName, FileInfo output) {
-		Console.Write($"{inputName} -> {output.Name} ... ");
+	public static int PrintException(string? message, [NotNull] Exception e, int exitCode = 0) =>
+		PrintErrorMessage(message, e.ToString(), exitCode);
+
+
+	public static int Execute<TIn, TOut>(Func<TIn, TOut, long> func, TIn input, TOut output, string? inputName, string? outputName, bool isStdOut = false) {
+		if (!isStdOut) {
+			Console.Write($"{inputName} -> {outputName} ... ");
+		}
 		try {
 			func(input, output);
-		} catch {
-			Console.WriteLine("Failed.");
-			return 4;
+		} catch (Exception e) {
+			return PrintException(isStdOut ? null : "Failed.", e, 4);
+		}
+		if (!isStdOut) {
+			Console.WriteLine("Done.");
 		}
-		Console.WriteLine("Done.");
 		return 0;
 	}
+
+	public static int WriteToStdOut<T>(Func<T, Stream, long> func, T input) {
+		try {
+			using var stdout = Console.OpenStandardOutput();
+			return Execute(func, input, stdout, null, null, true);
+		} catch (Exception e) {
+			return PrintException(null, e, 3);
+		}
+	}
+
+	public static int WriteToFile<T>(Func<T, FileInfo, long> func, T input, FileInfo output, string inputName) =>
+		Execute(func, input, output, inputName, output.Name);
 }
\ No newline at end of file
diff --git a/Program.cs b/Program.cs
index e3a8847..08677fa 100644
--- a/Program.cs
+++ b/Program.cs
@@ -5,165 +5,88 @@ 1. 无法解析命令行参数
 2. 无法读取文件（可能是文件不存在）
 3. Standard IO Stream 开启失败
 4. 编解码失败
+5. 无法创建输出文件夹（可能是输出文件夹是一个已存在的文件）
 */
 
+
 if (args.Length is not 2 and not 3 || args is not ["e", ..] and not ["d", ..]) {
 	Console.WriteLine("Usage: Base16384.Net.exe <\"e\" | \"d\"> <source | \"-\"> [out | \"-\"]");
 	return 1;
 }
 
-if (args[0] == "e") {
-	// Encode mode
-	if (args[1] == "-") {
-		// Read from stdin
-		try {
-			using var stdin = Console.OpenStandardInput();
-			if (args.Length == 2 || args[2] == "-") {
-				// Write to stdout
-				return Helpers.WriteToStdOut(Base16384.EncodeToStream, stdin);
-			}
+bool readFromStdin = args[1] == "-",
+	isDefaultOutput = args.Length == 2,
+	writeToStdout = (readFromStdin && isDefaultOutput) || (args is [string, string, "-"]), // `x -` or `x x -`
+	isEncodeMode = args[0] == "e"; // Encode mode or decode mode
 
-			// Write to file
-			FileInfo info = new(args[2]);
-			Console.Write($"<stdin> -> {info.Name} ... ");
-			try {
-				Base16384.EncodeToNewFile(stdin, info);
-			} catch {
-				Console.WriteLine("Failed.");
-				return 4;
-			}
-			Console.WriteLine("Done.");
 
-		} catch {
-			if (args.Length != 2 && args[2] != "-") {
-				Console.WriteLine("Can not open stdin.");
-			}
-			return 3;
-		}
-	} else {
-		// Read from file
-		if (args is [.., "-"]) {
-			// Write to stdout
-			return File.Exists(args[1])
-				? Helpers.WriteToStdOut(Base16384.EncodeFromFileToStream, new FileInfo(args[1]))
-				: 2;
-		} else if (args.Length == 2) {
-			// Write to .decoded file
-			if (!File.Exists(args[1])) {
-				if (Directory.Exists(args[1])) {
-					// 此处应该遍历文件夹
-					return 0;
-				}
-				Console.WriteLine("Source file not found.");
-				return 2;
-			}
-			FileInfo info = new(args[1]);
-			Console.Write($"{info.Name} -> {info.Name}.encoded ... ");
-			try {
-				Base16384.EncodeFromFileToNewFile(info, new($"{args[1]}.encoded"));
-			} catch {
-				Console.WriteLine("Failed.");
-				return 4;
-			}
-			Console.WriteLine("Done.");
-		} else {
-			// Write to file
-			if (!File.Exists(args[1])) {
-				if (Directory.Exists(args[1])) {
-					// 此处应该遍历文件夹
-					return 0;
-				}
-				Console.WriteLine("Source file not found.");
-				return 2;
-			}
-			FileInfo info1 = new(args[1]),
-				info2 = new(args[2]);
-			Console.Write($"{info1.Name} -> {info2.Name} ... ");
-			try {
-				Base16384.EncodeFromFileToNewFile(info1, info2);
-			} catch {
-				Console.WriteLine("Failed.");
-				return 4;
-			}
-			Console.WriteLine("Done.");
+if (readFromStdin) { // Read from stdin
+	try {
+		using var stdin = Console.OpenStandardInput();
+
+		if (writeToStdout) { // Write to stdout
+			return Helpers.WriteToStdOut(isEncodeMode ? Base16384.EncodeToStream : Base16384.DecodeToStream, stdin);
 		}
+
+		// Write to file
+
+		return Helpers.WriteToFile(isEncodeMode ? Base16384.EncodeToNewFile : Base16384.DecodeToNewFile,
+			 stdin, new(args[2]), "<stdin>");
+
+	} catch (Exception e) {
+
+		// If write to stdout, do not print message
+		return Helpers.PrintException(writeToStdout ? null : "Can not open stdin.", e, 3);
+
 	}
-} else {
-	// Decode mode
-	if (args[1] == "-") {
-		// Read from stdin
-		try {
-			using var stdin = Console.OpenStandardInput();
-			if (args.Length == 2 || args[2] == "-") {
-				// Write to stdout
-				return Helpers.WriteToStdOut(Base16384.DecodeToStream, stdin);
-			}
+}
 
-			// Write to file
-			FileInfo info = new(args[2]);
-			Console.Write($"<stdin> -> {info.Name} ... ");
-			try {
-				Base16384.DecodeToNewFile(stdin, info);
-			} catch {
-				Console.WriteLine("Failed.");
-				return 4;
-			}
-			Console.WriteLine("Done.");
+// Read from file
 
-		} catch {
-			if (args.Length != 2 && args[2] != "-") {
-				Console.WriteLine("Can not open stdin.");
-			}
-			return 3;
-		}
-	} else {
-		// Read from file
-		if (args is [.., "-"]) {
-			// Write to stdout
-			return File.Exists(args[1])
-				? Helpers.WriteToStdOut(Base16384.DecodeFromFileToStream, new FileInfo(args[1]))
-				: 2;
-		} else if (args.Length == 2) {
-			// Write to .decoded file
-			if (!File.Exists(args[1])) {
-				if (Directory.Exists(args[1])) {
-					// 此处应该遍历文件夹
-					return 0;
-				}
-				Console.WriteLine("Source file not found.");
-				return 2;
-			}
-			FileInfo info = new(args[1]);
-			Console.Write($"{info.Name} -> {info.Name}.decoded ... ");
-			try {
-				Base16384.DecodeFromFileToNewFile(info, new($"{args[1]}.decoded"));
-			} catch {
-				Console.WriteLine("Failed.");
-				return 4;
-			}
-			Console.WriteLine("Done.");
-		} else {
-			// Write to file
-			if (!File.Exists(args[1])) {
-				if (Directory.Exists(args[1])) {
-					// 此处应该遍历文件夹
-					return 0;
-				}
-				Console.WriteLine("Source file not found.");
-				return 2;
+if (writeToStdout) { // Write to stdout
+
+	return File.Exists(args[1])
+		? Helpers.WriteToStdOut(isEncodeMode ? Base16384.EncodeFromFileToStream : Base16384.DecodeFromFileToStream,
+			new FileInfo(args[1]))
+		: Helpers.PrintErrorMessage(null, "Source file not found.", 2);
+
+}
+
+// Write to file
+
+// File not found or Directory exists
+if (!File.Exists(args[1])) {
+
+	if (Directory.Exists(args[1])) { // Encode all files in the directory
+
+		var output = isDefaultOutput ? $"{(isEncodeMode ? "en" : "de")}coded" : args[2];
+		DirectoryInfo inputDirectoryInfo = new(args[1]),
+			outputDirectoryInfo = new(output);
+
+		if (!outputDirectoryInfo.Exists) { // Try to create output directory
+			if (File.Exists(output)) {
+				return Helpers.PrintErrorMessage("Output directory is an existing file.", null, 5);
 			}
-			FileInfo info1 = new(args[1]),
-				info2 = new(args[2]);
-			Console.Write($"{info1.Name} -> {info2.Name} ... ");
+
 			try {
-				Base16384.DecodeFromFileToNewFile(info1, info2);
-			} catch {
-				Console.WriteLine("Failed.");
-				return 4;
+				outputDirectoryInfo.Create();
+			} catch (Exception e) {
+				return Helpers.PrintException("Failed to create output directory.", e, 5);
 			}
-			Console.WriteLine("Done.");
 		}
+
+		// 此处应该遍历文件夹
+
+		return 0;
 	}
+
+	return Helpers.PrintErrorMessage("Source file not found.", null, 2);
 }
 
-return 0;
\ No newline at end of file
+// Encode single file
+
+FileInfo inputFileInfo = new(args[1]),
+		outputFileInfo = new(isDefaultOutput ? $"{args[1]}.{(isEncodeMode ? "en" : "de")}coded" : args[2]);
+
+return Helpers.Execute(isEncodeMode ? Base16384.EncodeFromFileToNewFile : Base16384.DecodeFromFileToNewFile,
+	inputFileInfo, outputFileInfo, inputFileInfo.Name, outputFileInfo.Name);
\ No newline at end of file