Explicitly turn off BOM when marshaling strings to/from Steamworks, j…

…ust to be safe

Facepunch.Steamworks/Utility/Utf8String.cs

@@ -1,15 +1,13 @@
 using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Net;
 using System.Runtime.InteropServices;
 using System.Text;
 
 namespace Steamworks
 {
 	internal unsafe class Utf8StringToNative : ICustomMarshaler
 	{
+		internal static readonly Encoding Utf8NoBom = new UTF8Encoding( false, false );
+
 		public IntPtr MarshalManagedToNative(object managedObj)
 		{
 			if ( managedObj == null )
@@ -19,10 +17,10 @@ public IntPtr MarshalManagedToNative(object managedObj)
 			{
 				fixed ( char* strPtr = str )
 				{
-					int len = Encoding.UTF8.GetByteCount( str );
+					int len = Utf8NoBom.GetByteCount( str );
 					var mem = Marshal.AllocHGlobal( len + 1 );
 
-					var wlen = System.Text.Encoding.UTF8.GetBytes( strPtr, str.Length, (byte*)mem, len + 1 );
+					var wlen = Utf8NoBom.GetBytes( strPtr, str.Length, (byte*)mem, len + 1 );
 
 					( (byte*)mem )[wlen] = 0;
 
@@ -64,7 +62,7 @@ public unsafe static implicit operator string( Utf8StringPointer p )
 				dataLen++;
 			}
 
-			return Encoding.UTF8.GetString( bytes, dataLen );
+			return Utf8StringToNative.Utf8NoBom.GetString( bytes, dataLen );
 		}
 	}
 }