Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web.Extensions/Util/HexParser.cs

@@ -0,0 +1,29 @@
+//------------------------------------------------------------------------------
+// <copyright file="HexParser.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+ 
+namespace System.Web.Util {
+    using System;
+    using System.Globalization;
+    using System.Text;
+
+    internal static class HexParser {
+        public static byte[] Parse(string token) {
+            byte[] tokenBytes = new byte[token.Length / 2];
+            for (int i = 0; i < tokenBytes.Length; i++) {
+                tokenBytes[i] = Byte.Parse(token.Substring(i * 2, 2), NumberStyles.HexNumber, CultureInfo.InvariantCulture);
+            }
+            return tokenBytes;
+        }
+
+        public static string ToString(byte[] tokenBytes) {
+            StringBuilder tokenBuilder = new StringBuilder(tokenBytes.Length * 2);
+            for (int i = 0; i < tokenBytes.Length; i++) {
+                tokenBuilder.Append(tokenBytes[i].ToString("x2", CultureInfo.InvariantCulture));
+            }
+            return tokenBuilder.ToString();
+        }
+    }
+}