Imported Upstream version 5.0.0.42

Former-commit-id: fd56571888259555122d8a0f58c68838229cea2b

external/linker/cecil/Mono.Cecil.Metadata/GuidHeap.cs

@@ -0,0 +1,36 @@
+//
+// Author:
+//   Jb Evain (jbevain@gmail.com)
+//
+// Copyright (c) 2008 - 2015 Jb Evain
+// Copyright (c) 2008 - 2011 Novell, Inc.
+//
+// Licensed under the MIT/X11 license.
+//
+
+using System;
+
+namespace Mono.Cecil.Metadata {
+
+	sealed class GuidHeap : Heap {
+
+		public GuidHeap (byte [] data)
+			: base (data)
+		{
+		}
+
+		public Guid Read (uint index)
+		{
+			const int guid_size = 16;
+
+			if (index == 0 || ((index - 1) + guid_size) > data.Length)
+				return new Guid ();
+
+			var buffer = new byte [guid_size];
+
+			Buffer.BlockCopy (this.data, (int) ((index - 1) * guid_size), buffer, 0, guid_size);
+
+			return new Guid (buffer);
+		}
+	}
+}