Source code for ascii.cs

using System;

using System.IO;

using System.Runtime.InteropServices;

using System.Text;

namespace RobvanderWoude

{

	class ASCII

	{

		static int Main( string[] args )

		{

			bool isredirected = ConsoleEx.InputRedirected;

			if ( isredirected ^ args.Length == 0 )

			{

				return WriteError( );

			}

			if ( args.Length > 1 )

			{

				return WriteError( "Invalid command line arguments" );

			}

			if ( isredirected )

			{

				Console.Write( Encoding.Unicode.GetString( Encoding.ASCII.GetBytes( Console.In.ReadToEnd( ) ) ) );

			}

			else

			{

				string file = args[0];

				if ( file[0] == '/' )

				{

					return WriteError( ( file == "/?" ? "" : "Invalid command line argument" ) );

				}

				else

				{

					if ( File.Exists( file ) )

					{

						StreamReader sr = new StreamReader( file );

						Console.Write( Encoding.Unicode.GetString( Encoding.ASCII.GetBytes( sr.ReadToEnd( ) ) ) );

						sr.Close( );

					}

					else

					{

						return WriteError( "File not found" );

					}

				}

			}

			return 0;

		}

		#region Redirection Detection

		// Code to detect redirection by Hans Passant on StackOverflow.com

		// http://stackoverflow.com/questions/3453220/how-to-detect-if-console-in-stdin-has-been-redirected

		public static class ConsoleEx

		{

			public static bool OutputRedirected

			{

				get

				{

					return FileType.Char != GetFileType( GetStdHandle( StdHandle.Stdout ) );

				}

			}

			public static bool InputRedirected

			{

				get

				{

					return FileType.Char != GetFileType( GetStdHandle( StdHandle.Stdin ) );

				}

			}

			public static bool ErrorRedirected

			{

				get

				{

					return FileType.Char != GetFileType( GetStdHandle( StdHandle.Stderr ) );

				}

			}

			// P/Invoke:

			private enum FileType { Unknown, Disk, Char, Pipe };

			private enum StdHandle { Stdin = -10, Stdout = -11, Stderr = -12 };

			[DllImport( "kernel32.dll" )]

			private static extern FileType GetFileType( IntPtr hdl );

			[DllImport( "kernel32.dll" )]

			private static extern IntPtr GetStdHandle( StdHandle std );

		}

		#endregion Redirection Detection

		#region Error Handling

		public static int WriteError( Exception e = null )

		{

			return WriteError( e == null ? null : e.Message );

		}

		public static int WriteError( string errorMessage )

		{

			Console.OpenStandardError( );

			if ( string.IsNullOrEmpty( errorMessage ) == false )

			{

				Console.Error.WriteLine( );

				Console.ForegroundColor = ConsoleColor.Red;

				Console.Error.Write( "ERROR: " );

				Console.ForegroundColor = ConsoleColor.White;

				Console.Error.WriteLine( errorMessage );

				Console.ResetColor( );

			}

			/*

			ASCII,  Version 1.00

			Convert a text file or Standard Input to ASCII and send it to Standard Output

			Usage:   some_command  |  ASCII  >  file

			   or:   some_command  |  ASCII  |  other_command

			   or:   ASCII  "textfile"  >  file

			   or:   ASCII  "textfile"  |  other_command

			Example: Compare the results of the following commands:

			         SUBINACL  /?  |  MORE

			         SUBINACL  /?  |  ASCII  |  MORE

			Check for redirection by Hans Passant on StackOverflow.com

			/questions/3453220/how-to-detect-if-console-in-stdin-has-been-redirected

			Written by Rob van der Woude

			http://www.robvanderwoude.com

			 */

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "ASCII,  Version 1.00" );

			Console.Error.WriteLine( "Convert a text file or Standard Input to ASCII and send it to Standard Output" );

			Console.Error.WriteLine( );

			Console.Error.Write( "Usage:   " );

			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.WriteLine( "some_command  |  ASCII  >  file" );

			Console.ResetColor( );

			Console.Error.Write( "or:      " );

			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.WriteLine( "some_command  |  ASCII  |  other_command" );

			Console.ResetColor( );

			Console.Error.Write( "or:      " );

			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.WriteLine( "ASCII  \"textfile\"  >  file" );

			Console.ResetColor( );

			Console.Error.Write( "or:      " );

			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.WriteLine( "ASCII  \"textfile\"  |  other_command" );

			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "Example: Compare the results of the following commands:" );

			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.WriteLine( "         SUBINACL  /?  |  MORE" );

			Console.Error.WriteLine( "         SUBINACL  /?  |  ASCII  |  MORE" );

			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.Write( "Check for redirection by Hans Passant on " );

			Console.ForegroundColor = ConsoleColor.DarkGray;

			Console.Error.WriteLine( "StackOverflow.com" );

			Console.Error.WriteLine( "/questions/3453220/how-to-detect-if-console-in-stdin-has-been-redirected" );

			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "Written by Rob van der Woude" );

			Console.Error.Write( "http://www.robvanderwoude.com" );

			Console.OpenStandardOutput( );

			return 1;

		}

		#endregion Error Handling

	}

}