BinaryExtensions.cs

using System;
 
namespace OSDP.Net.Utilities
{
    public static class BinaryExtensions
    {
        public static byte ReverseBits(this byte value)
        {
            int c = (byte)((value >> 4) | ((value & 0xf) << 4));
            c = ((c & 0xcc) >> 2) | ((c & 0x33) << 2);
            c = ((c & 0xaa) >> 1) | ((c & 0x55) << 1);
            return (byte)c;
        }

        public static bool IsHex(this char c) => (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f' || c >= 'A' && c <= 'F');

        public static int HexToInt(this char value) => value switch
        {
            { } c when (c >= '0' && c <= '9') => (byte)(c - '0'),
            { } c when (c >= 'A' && c <= 'F') => (byte)(c - 'A' + 10),
            { } c when (c >= 'a' && c <= 'f') => (byte)(c - 'a' + 10),
            _ => throw new InvalidOperationException("Not a valid hex string")
        };
    }
}