- miscellaneous small fixes

- add support for preventing all commands to be run on the channel by default. Now TechBot only answers some of the commands in PM
- add back the error Command

svn path=/trunk/; revision=34079

irc/TechBot/TechBot.Commands.Common/ErrorCommand.cs

@@ -0,0 +1,180 @@
+using System;
+using System.Xml;
+using System.Collections;
+
+using TechBot.Library;
+
+namespace TechBot.Commands.Common
+{
+    [Command("error", Help = "!error <value>")]
+	public class ErrorCommand : Command
+	{
+		private NtStatusCommand ntStatus;
+		private WinErrorCommand winerror;
+		private HResultCommand hresult;
+
+        public ErrorCommand()
+        {
+            this.ntStatus = new NtStatusCommand();
+            this.winerror = new WinErrorCommand();
+            this.hresult = new HResultCommand();
+        }
+
+		private static int GetSeverity(long error)
+		{
+			return (int)((error >> 30) & 0x3);
+		}
+
+		private static bool IsCustomer(long error)
+		{
+			return (error & 0x20000000) != 0;
+		}
+		
+		private static bool IsReserved(long error)
+		{
+			return (error & 0x10000000) != 0;
+		}
+
+		private static int GetFacility(long error)
+		{
+			return (int)((error >> 16) & 0xFFF);
+		}
+		
+		private static short GetCode(long error)
+		{
+			return (short)((error >> 0) & 0xFFFF);
+		}
+
+		private static string FormatSeverity(long error)
+		{
+			int severity = GetSeverity(error);
+			switch (severity)
+			{
+			case 0: return "SUCCESS";
+			case 1: return "INFORMATIONAL";
+			case 2: return "WARNING";
+			case 3: return "ERROR";
+			}
+			return null;
+		}
+
+		private static string FormatFacility(long error)
+		{
+			int facility = GetFacility(error);
+			return facility.ToString();
+		}
+
+		private static string FormatCode(long error)
+		{
+			int code = GetCode(error);
+			return code.ToString();
+		}
+
+		public override void  ExecuteCommand()
+        {
+            if (Parameters.Equals(String.Empty))
+			{
+				Say("Please provide an Error Code.");
+				return;
+			}
+			
+			string errorText = Parameters;
+
+		retry:
+			NumberParser np = new NumberParser();
+			long error = np.Parse(errorText);
+            if (np.Error)
+            {
+                Say("{0} is not a valid Error Code.", Parameters);
+                return;
+            }
+			
+			ArrayList descriptions = new ArrayList();
+
+			// Error is out of bounds
+			if ((ulong)error > uint.MaxValue)
+			{
+				// Do nothing
+			}
+			// Error is outside of the range [0, 65535]: it cannot be a plain Win32 error code
+			else if ((ulong)error > ushort.MaxValue)
+			{
+				// Customer bit is set: custom error code
+				if (IsCustomer(error))
+				{
+					string description = String.Format("[custom, severity {0}, facility {1}, code {2}]",
+					                                   FormatSeverity(error),
+					                                   FormatFacility(error),
+					                                   FormatCode(error));
+					descriptions.Add(description);
+				}
+				// Reserved bit is set: HRESULT_FROM_NT(ntstatus)
+				else if (IsReserved(error))
+				{
+					int status = (int)(error & 0xCFFFFFFF);
+					string description = ntStatus.GetNtstatusDescription(status);
+					
+					if (description == null)
+						description = status.ToString("X");
+					
+					description = String.Format("HRESULT_FROM_NT({0})", description);
+					descriptions.Add(description);
+				}
+				// Win32 facility: HRESULT_FROM_WIN32(winerror)
+				else if (GetFacility(error) == 7)
+				{
+					// Must be an error code
+					if (GetSeverity(error) == 2)
+					{
+						short err = GetCode(error);
+						string description = winerror.GetWinerrorDescription(err);
+						
+						if (description == null)
+							description = err.ToString("D");
+						
+						description = String.Format("HRESULT_FROM_WIN32({0})", description);
+						descriptions.Add(description);
+					}
+				}
+			}
+
+			string winerrorDescription = winerror.GetWinerrorDescription(error);
+			string ntstatusDescription = ntStatus.GetNtstatusDescription(error);
+			string hresultDescription = hresult.GetHresultDescription(error);
+			
+			if (winerrorDescription != null)
+				descriptions.Add(winerrorDescription);
+			if (ntstatusDescription != null)
+				descriptions.Add(ntstatusDescription);
+			if (hresultDescription != null)
+				descriptions.Add(hresultDescription);
+
+			if (descriptions.Count == 0)
+			{
+				// Last chance heuristics: attempt to parse a 8-digit decimal as hexadecimal
+				if (errorText.Length == 8)
+				{
+					errorText = "0x" + errorText;
+					goto retry;
+				}
+
+                Say("I don't know about Error Code {0}.",
+                                                      Parameters);
+			}
+            else if (descriptions.Count == 1)
+            {
+                string description = (string)descriptions[0];
+                Say("{0} is {1}.",
+                                                      Parameters,
+                                                      description);
+            }
+            else
+            {
+                Say("{0} could be:", Parameters);
+
+                foreach (string description in descriptions)
+                    Say("\t{0}", description);
+            }
+		}
+	}
+}