Use span

Author: xPaw

ValveKeyValue/ValveKeyValue/HexStringHelper.cs

@@ -12,8 +12,7 @@ public static byte[] ParseHexStringAsByteArray(string hexadecimalRepresentation)
             var data = new byte[hexadecimalRepresentation.Length / 2];
             for (var i = 0; i < data.Length; i++)
             {
-                var currentByteText = hexadecimalRepresentation.Substring(i * 2, 2);
-                data[i] = byte.Parse(currentByteText, NumberStyles.HexNumber, CultureInfo.InvariantCulture);
+                data[i] = byte.Parse(hexadecimalRepresentation.AsSpan(i * 2, 2), NumberStyles.HexNumber, CultureInfo.InvariantCulture);
             }
 
             return data;