1 files changed, 24 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/Runtime/InteropServices/PInvokeMarshal.cs b/src/mscorlib/src/System/Runtime/InteropServices/PInvokeMarshal.cs
new file mode 100644
index 0000000000..9eb60bdce7
--- /dev/null
+++ b/src/mscorlib/src/System/Runtime/InteropServices/PInvokeMarshal.cs
@@ -0,0 +1,24 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.Win32;
+
+namespace System.Runtime.InteropServices
+{
+    internal static class PInvokeMarshal
+    {
+        public static IntPtr AllocBSTR(int length)
+        {
+            IntPtr bstr = Win32Native.SysAllocStringLen(null, length);
+            if (bstr == IntPtr.Zero)
+                throw new OutOfMemoryException();
+            return bstr;
+        }
+
+        public static void FreeBSTR(IntPtr ptr)
+        {
+            Win32Native.SysFreeString(ptr);
+        }
+    }
+}