1 files changed, 54 insertions, 0 deletions

diff --git a/src/api/burn/WixToolset.Mba.Core/StrUtil.cs b/src/api/burn/WixToolset.Mba.Core/StrUtil.cs
new file mode 100644
index 00000000..5daef8e3
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/StrUtil.cs
@@ -0,0 +1,54 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+namespace WixToolset.Mba.Core
+{
+    using System;
+    using System.Runtime.InteropServices;
+    using System.Security;
+    using System.Text;
+
+    internal static class StrUtil
+    {
+        [DllImport("mbanative.dll", ExactSpelling = true)]
+        internal static extern void StrFree(
+            IntPtr scz
+            );
+
+        internal sealed class StrHandle : SafeHandleZeroIsDefaultAndInvalid
+        {
+            protected override bool ReleaseHandle()
+            {
+                StrFree(this.handle);
+                return true;
+            }
+
+            public string ToUniString()
+            {
+                return Marshal.PtrToStringUni(this.handle);
+            }
+
+            public SecureString ToSecureString()
+            {
+                if (this.handle == IntPtr.Zero)
+                {
+                    return null;
+                }
+
+                SecureString value = new SecureString();
+                char c;
+                for (int charIndex = 0; ; charIndex++)
+                {
+                    c = (char)Marshal.ReadInt16(this.handle, charIndex * UnicodeEncoding.CharSize);
+                    if (c == '\0')
+                    {
+                        break;
+                    }
+
+                    value.AppendChar(c);
+                }
+
+                return value;
+            }
+        }
+    }
+}