HexConverter.cs

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using System.Runtime.CompilerServices;
 
namespace System;
 
internal static class HexConverter
{
    public enum Casing : uint
    {
        Upper = 0u,
        Lower = 8224u
    }
 
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static void ToBytesBuffer(byte value, Span<byte> buffer, int startingIndex = 0, Casing casing = Casing.Upper)
    {
        uint num = (uint)(((value & 0xF0) << 4) + (value & 0xF) - 35209);
        uint num2 = ((((0 - num) & 0x7070) >> 4) + num + 47545) | (uint)casing;
        buffer[startingIndex + 1] = (byte)num2;
        buffer[startingIndex] = (byte)(num2 >> 8);
    }
 
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static void ToCharsBuffer(byte value, Span<char> buffer, int startingIndex = 0, Casing casing = Casing.Upper)
    {
        uint num = (uint)(((value & 0xF0) << 4) + (value & 0xF) - 35209);
        uint num2 = ((((0 - num) & 0x7070) >> 4) + num + 47545) | (uint)casing;
        buffer[startingIndex + 1] = (char)(num2 & 0xFFu);
        buffer[startingIndex] = (char)(num2 >> 8);
    }
 
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static char ToCharUpper(int value)
    {
        value &= 0xF;
        value += 48;
        if (value > 57)
        {
            value += 7;
        }
        return (char)value;
    }
}