Imported Upstream version 1.1.0upstream/1.1.0

1 files changed, 50 insertions, 0 deletions

diff --git a/src/mscorlib/src/Microsoft/Win32/SafeHandles/SafeViewOfFileHandle.cs b/src/mscorlib/src/Microsoft/Win32/SafeHandles/SafeViewOfFileHandle.cs
new file mode 100644
index 0000000000..01ec4d2ad8
--- /dev/null
+++ b/src/mscorlib/src/Microsoft/Win32/SafeHandles/SafeViewOfFileHandle.cs
@@ -0,0 +1,50 @@
+// 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.
+
+/*============================================================
+**
+**
+**
+** A wrapper for file handles
+**
+** 
+===========================================================*/
+using System;
+using System.Security;
+using System.Security.Permissions;
+using System.Runtime.InteropServices;
+using System.Runtime.CompilerServices;
+using System.Runtime.ConstrainedExecution;
+using System.Runtime.Versioning;
+using Microsoft.Win32;
+using Microsoft.Win32.SafeHandles;
+
+namespace Microsoft.Win32.SafeHandles
+{
+    [System.Security.SecurityCritical]  // auto-generated
+    internal sealed class SafeViewOfFileHandle : SafeHandleZeroOrMinusOneIsInvalid
+    {
+        [System.Security.SecurityCritical]  // auto-generated_required
+        internal SafeViewOfFileHandle() : base(true) {}
+
+        // 0 is an Invalid Handle
+        [System.Security.SecurityCritical]  // auto-generated_required
+        internal SafeViewOfFileHandle(IntPtr handle, bool ownsHandle) : base (ownsHandle) {
+            SetHandle(handle);
+        }
+
+        [System.Security.SecurityCritical]
+        override protected bool ReleaseHandle()
+        {
+            if (Win32Native.UnmapViewOfFile(handle))
+            {
+                handle = IntPtr.Zero;
+                return true;
+            }
+            
+            return false;
+        }
+    }
+}
+