Imported Upstream version 5.0.0.42

Former-commit-id: fd56571888259555122d8a0f58c68838229cea2b

external/linker/cecil/Mono.Cecil.Metadata/UserStringHeap.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.
+//
+
+namespace Mono.Cecil.Metadata {
+
+	sealed class UserStringHeap : StringHeap {
+
+		public UserStringHeap (byte [] data)
+			: base (data)
+		{
+		}
+
+		protected override string ReadStringAt (uint index)
+		{
+			int start = (int) index;
+
+			uint length = (uint) (data.ReadCompressedUInt32 (ref start) & ~1);
+			if (length < 1)
+				return string.Empty;
+
+			var chars = new char [length / 2];
+
+			for (int i = start, j = 0; i < start + length; i += 2)
+				chars [j++] = (char) (data [i] | (data [i + 1] << 8));
+
+			return new string (chars);
+		}
+	}
+}