complete fix for SD-1527 - A display binding's supported files should be independent from the files it handles by default

and SD-1174 - Automatically detect the type of files with unknown extensions

src/Main/Base/Project/ICSharpCode.SharpDevelop.addin

@@ -59,6 +59,9 @@
 		<DisplayBinding id    = "Browser"
 		                title = "${res:Gui.ProjectBrowser.OpenWith.Bindings.WebBrowser}"
 		                class = "ICSharpCode.SharpDevelop.BrowserDisplayBinding.BrowserDisplayBinding"/>
+		<DisplayBinding id    = "AutoDetect"
+		                title = "Auto-detect file type"
+		                class = "ICSharpCode.SharpDevelop.AutoDetectDisplayBinding"/>
 	</Path>
 	
 	<Path name = "/SharpDevelop/Workbench/FileFilter">

src/Main/Base/Project/ICSharpCode.SharpDevelop.csproj

@@ -14,7 +14,7 @@
     <SignAssembly>True</SignAssembly>
     <AssemblyOriginatorKeyFile>..\..\ICSharpCode.SharpDevelop.snk</AssemblyOriginatorKeyFile>
     <AssemblyOriginatorKeyMode>File</AssemblyOriginatorKeyMode>
-    <AllowUnsafeBlocks>False</AllowUnsafeBlocks>
+    <AllowUnsafeBlocks>True</AllowUnsafeBlocks>
     <RegisterForComInterop>False</RegisterForComInterop>
     <GenerateSerializationAssemblies>Auto</GenerateSerializationAssemblies>
     <BaseAddress>88080384</BaseAddress>
@@ -321,6 +321,7 @@
     <Compile Include="Src\Services\Debugger\Tooltips\ITreeNode.cs" />
     <Compile Include="Src\Services\Debugger\Tooltips\IVisualizerCommand.cs" />
     <Compile Include="Src\Services\Debugger\Tooltips\PinBookmark.cs" />
+    <Compile Include="Src\Services\DisplayBinding\AutoDetectDisplayBinding.cs" />
     <Compile Include="Src\Services\DisplayBinding\ExternalProcessDisplayBinding.cs" />
     <Compile Include="Src\Services\DisplayBinding\ISecondaryDisplayBinding.cs" />
     <Compile Include="Src\Services\DisplayBinding\ShellExecuteDisplayBinding.cs" />

src/Main/Base/Project/Src/Services/DisplayBinding/AutoDetectDisplayBinding.cs

@@ -0,0 +1,84 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices;
+using ICSharpCode.SharpDevelop.Gui;
+
+namespace ICSharpCode.SharpDevelop
+{
+	/// <summary>
+	/// Implements content auto detection and opens the appropriate IViewContent.
+	/// </summary>
+	public sealed class AutoDetectDisplayBinding : IDisplayBinding
+	{
+		[DllImport("urlmon.dll", CharSet = CharSet.Unicode, ExactSpelling = true, SetLastError = false)]
+		static extern unsafe int FindMimeFromData(
+			IntPtr pBC,
+			[MarshalAs(UnmanagedType.LPWStr)] string pwzUrl,
+			byte* pBuffer,
+			int cbSize,
+			[MarshalAs(UnmanagedType.LPWStr)] string pwzMimeProposed,
+			int dwMimeFlags,
+			out IntPtr ppwzMimeOut,
+			int dwReserved);
+		
+		public bool IsPreferredBindingForFile(string fileName)
+		{
+			return false;
+		}
+		
+		public bool CanCreateContentForFile(string fileName)
+		{
+			return true;
+		}
+		
+		public double AutoDetectFileContent(string fileName, Stream fileContent, string detectedMimeType)
+		{
+			return double.NegativeInfinity;
+		}
+		
+		public IViewContent CreateContentForFile(OpenedFile file)
+		{
+			var codons = DisplayBindingService.GetCodonsPerFileName(file.FileName);
+			DisplayBindingDescriptor bestMatch = null;
+			double max = double.NegativeInfinity;
+			const int BUFFER_LENGTH = 4 * 1024;
+			
+			using (var stream = file.OpenRead()) {
+				foreach (var codon in codons) {
+					stream.Position = 0;
+					string mime = FindMimeType(new BinaryReader(stream).ReadBytes(BUFFER_LENGTH));
+					stream.Position = 0;
+					double value = codon.Binding.AutoDetectFileContent(file.FileName, stream, mime);
+					if (value > max) {
+						max = value;
+						bestMatch = codon;
+					}
+				}
+			}
+			
+			if (bestMatch == null)
+				throw new InvalidOperationException();
+			
+			return bestMatch.Binding.CreateContentForFile(file);
+		}
+		
+		unsafe string FindMimeType(byte[] buffer)
+		{
+			fixed (byte *b = buffer) {
+				const int FMFD_ENABLEMIMESNIFFING = 0x00000002;
+				IntPtr mimeout;
+				int result = FindMimeFromData(IntPtr.Zero, null, b, buffer.Length, null, FMFD_ENABLEMIMESNIFFING, out mimeout, 0);
+	
+				if (result != 0)
+					throw Marshal.GetExceptionForHR(result);
+				string mime = Marshal.PtrToStringUni(mimeout);
+				Marshal.FreeCoTaskMem(mimeout);
+				return mime;
+			}
+		}
+	}
+}

src/Main/Base/Project/Src/Services/DisplayBinding/DisplayBindingService.cs

@@ -108,18 +108,16 @@ namespace ICSharpCode.SharpDevelop
 					}
 				}
 			}
-			
+			DisplayBindingDescriptor autoDetectDescriptor = null;
 			foreach (DisplayBindingDescriptor binding in bindings) {
-				if (IsPrimaryBindingValidForFileName(binding, filename) && binding.Binding.IsPreferredBindingForFile(filename)) {
-					return binding;
+				if (IsPrimaryBindingValidForFileName(binding, filename)) {
+					if (binding.Binding.IsPreferredBindingForFile(filename))
+						return binding;
+					else if (binding.Binding is AutoDetectDisplayBinding)
+						autoDetectDescriptor = binding;
 				}
 			}
-			
-//			var autoDetect = new AutoDetectDisplayBinding();
-//			if (autoDetect.AutoDetectFileContent(filename, new MemoryStream(File.ReadAllBytes(filename))) > double.NegativeInfinity)
-//				return autoDetect.BestDescriptor;
-			
-			return null;
+			return autoDetectDescriptor;
 		}
 		
 		public static void SetDefaultCodon(string extension, DisplayBindingDescriptor bindingDescriptor)

src/Main/Base/Project/Src/Services/DisplayBinding/IDisplayBinding.cs

@@ -4,7 +4,7 @@
 using System;
 using System.IO;
 using System.Linq;
-
+using System.Runtime.InteropServices;
 using ICSharpCode.SharpDevelop.Gui;
 
 namespace ICSharpCode.SharpDevelop
@@ -39,47 +39,5 @@ namespace ICSharpCode.SharpDevelop
 		IViewContent CreateContentForFile(OpenedFile file);
 	}
 	
-	public sealed class AutoDetectDisplayBinding : IDisplayBinding
-	{
-		DisplayBindingDescriptor bestDescriptor;
-		
-		public DisplayBindingDescriptor BestDescriptor {
-			get { return bestDescriptor; }
-		}
-		
-		public bool IsPreferredBindingForFile(string fileName)
-		{
-			return false;
-		}
-		
-		public bool CanCreateContentForFile(string fileName)
-		{
-			return true;
-		}
-		
-		public double AutoDetectFileContent(string fileName, Stream fileContent, string detectedMimeType)
-		{
-			double max = double.MinValue;
-			
-//			foreach (var codon in DisplayBindingService.GetCodonsPerFileName(fileName)) {
-//				double value = codon.Binding.AutoDetectFileContent(fileName, fileContent);
-//				if (value > max) {
-//					max = value;
-//					bestDescriptor = codon;
-//				}
-//			}
-//			
-//			fileContent.Close();
-			
-			return max;
-		}
-		
-		public IViewContent CreateContentForFile(OpenedFile file)
-		{
-			if (bestDescriptor == null)
-				throw new InvalidOperationException();
-			
-			return bestDescriptor.Binding.CreateContentForFile(file);
-		}
-	}
+
 }