Replace Utilities with modern .NET function

LibIRD/IRD.cs

@@ -195,7 +195,7 @@ namespace LibIRD
             if (discKeyStr.Length != 32)
                 throw new InvalidDataException("Unexpected Disc Key in .getkey.log");
             // Convert Disc Key to byte array
-            discKey = Utilities.HexToBytes(discKeyStr);
+            discKey = Convert.FromHexString(discKeyStr);
 
             // Read Disc ID
             byte[] discID;
@@ -210,7 +210,7 @@ namespace LibIRD
             // Replace X's in Disc ID with 00000001
             discIDStr = discIDStr[..24] + "00000001";
             // Convert Disc ID to byte array
-            discID = Utilities.HexToBytes(discIDStr);
+            discID = Convert.FromHexString(discIDStr);
 
             // Look for PIC in log
             byte[] discPIC;
@@ -225,7 +225,7 @@ namespace LibIRD
             if (discPICStr.Length != 256)
                 throw new InvalidDataException("Unexpected PIC in .getkey.log");
             // Convert PIC to byte array
-            discPIC = Utilities.HexToBytes(discPICStr[..230]);
+            discPIC = Convert.FromHexString(discPICStr[..230]);
 
             // Double check for warnings in .getkey.log
             while ((line = sr.ReadLine()) != null && line.Trim().StartsWith("WARNING") == false && line.Trim().StartsWith("SUCCESS") == false)

LibIRD/Utilities.cs

@@ -1,58 +0,0 @@
-using System;
-
-namespace LibIRD
-{
-    internal class Utilities
-    {
-        // Helper function to convert a hex string to a byte array
-        // Original source: https://codereview.stackexchange.com/a/53846
-
-        private static int HexToInt(char c)
-        {
-            return c switch
-            {
-                '0' => 0,
-                '1' => 1,
-                '2' => 2,
-                '3' => 3,
-                '4' => 4,
-                '5' => 5,
-                '6' => 6,
-                '7' => 7,
-                '8' => 8,
-                '9' => 9,
-                'a' or 'A' => 10,
-                'b' or 'B' => 11,
-                'c' or 'C' => 12,
-                'd' or 'D' => 13,
-                'e' or 'E' => 14,
-                'f' or 'F' => 15,
-                _ => throw new FormatException("Unrecognized hex char " + c),
-            };
-        }
-
-        private static readonly byte[,] ByteLookup = new byte[,]
-        {
-            // low nibble
-            {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f},
-            // high nibble
-            {0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70, 0x80, 0x90, 0xa0, 0xb0, 0xc0, 0xd0, 0xe0, 0xf0}
-        };
-
-        internal static byte[] HexToBytes(string input)
-        {
-            var result = new byte[(input.Length + 1) >> 1];
-            int lastcell = result.Length - 1;
-            int lastchar = input.Length - 1;
-            // count up in characters, but inside the loop will
-            // reference from the end of the input/output.
-            for (int i = 0; i < input.Length; i++)
-            {
-                // i >> 1    -  (i / 2) gives the result byte offset from the end
-                // i & 1     -  1 if it is high-nibble, 0 for low-nibble.
-                result[lastcell - (i >> 1)] |= ByteLookup[i & 1, HexToInt(input[lastchar - i])];
-            }
-            return result;
-        }
-    }
-}