including missing file from previous commit

NAudio.Universal/Utils/MarshalHelpers.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Linq;
+using System.Runtime.InteropServices;
+
+// ReSharper disable once CheckNamespace
+namespace NAudio.Utils
+{
+    /// <summary>
+    /// Support for Marshal Methods in both UWP and .NET 3.5
+    /// </summary>
+    public static class MarshalHelpers
+    {
+        /// <summary>
+        /// SizeOf a structure
+        /// </summary>
+        public static int SizeOf<T>()
+        {
+            return Marshal.SizeOf<T>();
+        }
+
+        /// <summary>
+        /// Offset of a field in a structure
+        /// </summary>
+        public static IntPtr OffsetOf<T>(string fieldName)
+        {
+            return Marshal.OffsetOf<T>(fieldName);
+        }
+
+        /// <summary>
+        /// Pointer to Structure
+        /// </summary>
+        public static T PtrToStructure<T>(IntPtr pointer)
+        {
+            return Marshal.PtrToStructure<T>(pointer);
+        }
+    }
+}