com.unity.ide.visualstudio@2.0.1

## [2.0.1] - 2020-03-19

When Visual Studio installation is compatible with C# 8.0, setup the language version to not prompt the user with unsupported constructs. (So far Unity only supports C# 7.3).
Use Unity's TypeCache to improve project generation speed.
Properly check for a managed assembly before displaying a warning regarding legacy PDB usage.
Add support for selective project generation (embedded, local, registry, git, builtin, player).

Editor/Image.cs

@@ -0,0 +1,101 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+using System;
+using System.IO;
+
+namespace Microsoft.Unity.VisualStudio.Editor
+{
+	public sealed class Image : IDisposable {
+
+		long position;
+		Stream stream;
+
+		Image (Stream stream)
+		{
+			this.stream = stream;
+			this.position = stream.Position;
+			this.stream.Position = 0;
+		}
+
+		bool Advance (int length)
+		{
+			if (stream.Position + length >= stream.Length)
+				return false;
+
+			stream.Seek (length, SeekOrigin.Current);
+			return true;
+		}
+
+		bool MoveTo (uint position)
+		{
+			if (position >= stream.Length)
+				return false;
+
+			stream.Position = position;
+			return true;
+		}
+
+		void IDisposable.Dispose ()
+		{
+			stream.Position = position;
+		}
+
+		ushort ReadUInt16 ()
+		{
+			return (ushort) (stream.ReadByte ()
+				| (stream.ReadByte () << 8));
+		}
+
+		uint ReadUInt32 ()
+		{
+			return (uint) (stream.ReadByte ()
+				| (stream.ReadByte () << 8)
+				| (stream.ReadByte () << 16)
+				| (stream.ReadByte () << 24));
+		}
+
+		bool IsManagedAssembly ()
+		{
+			if (stream.Length < 318)
+				return false;
+			if (ReadUInt16 () != 0x5a4d)
+				return false;
+			if (!Advance (58))
+				return false;
+			if (!MoveTo (ReadUInt32 ()))
+				return false;
+			if (ReadUInt32 () != 0x00004550)
+				return false;
+			if (!Advance (20))
+				return false;
+			if (!Advance (ReadUInt16 () == 0x20b ? 222 : 206))
+				return false;
+
+			return ReadUInt32 () != 0;
+		}
+
+		public static bool IsAssembly (string file)
+		{
+			if (file == null)
+				throw new ArgumentNullException ("file");
+
+			using (var stream = new FileStream (file, FileMode.Open, FileAccess.Read, FileShare.Read))
+				return IsAssembly (stream);
+		}
+
+		public static bool IsAssembly (Stream stream)
+		{
+			if (stream == null)
+				throw new ArgumentNullException (nameof(stream));
+			if (!stream.CanRead)
+				throw new ArgumentException (nameof(stream));
+			if (!stream.CanSeek)
+				throw new ArgumentException (nameof(stream));
+
+			using (var image = new Image (stream))
+				return image.IsManagedAssembly ();
+		}
+	}
+}