1 files changed, 57 insertions, 0 deletions
diff --git a/MediaBrowser.Common/Hex.cs b/MediaBrowser.Common/Hex.cs
new file mode 100644
index 000000000..e19a9a1f4
--- /dev/null
+++ b/MediaBrowser.Common/Hex.cs
@@ -0,0 +1,57 @@
+using System;
+using System.Globalization;
+
+namespace MediaBrowser.Common
+{
+    /// <summary>
+    /// Encoding and decoding hex strings.
+    /// </summary>
+    public static class Hex
+    {
+        internal const string HexCharsLower = "0123456789abcdef";
+        internal const string HexCharsUpper = "0123456789ABCDEF";
+
+        /// <summary>
+        /// Encodes <c>bytes</c> as a hex string.
+        /// </summary>
+        /// <param name="bytes"></param>
+        /// <param name="lowercase"></param>
+        /// <returns><c>bytes</c> as a hex string.</returns>
+        public static string Encode(ReadOnlySpan<byte> bytes, bool lowercase = true)
+        {
+            var hexChars = lowercase ? HexCharsLower : HexCharsUpper;
+
+            // TODO: use string.Create when it's supports spans
+            // Ref: https://github.com/dotnet/corefx/issues/29120
+            char[] s = new char[bytes.Length * 2];
+            int j = 0;
+            for (int i = 0; i < bytes.Length; i++)
+            {
+                s[j++] = hexChars[bytes[i] >> 4];
+                s[j++] = hexChars[bytes[i] & 0x0f];
+            }
+
+            return new string(s);
+        }
+
+        /// <summary>
+        /// Decodes a hex string into bytes.
+        /// </summary>
+        /// <param name="str">The <see cref="string" />.</param>
+        /// <returns>The decoded bytes.</returns>
+        public static byte[] Decode(ReadOnlySpan<char> str)
+        {
+            byte[] bytes = new byte[str.Length / 2];
+            int j = 0;
+            for (int i = 0; i < str.Length; i += 2)
+            {
+                bytes[j++] = byte.Parse(
+                    str.Slice(i, 2),
+                    NumberStyles.HexNumber,
+                    CultureInfo.InvariantCulture);
+            }
+
+            return bytes;
+        }
+    }
+}