A C# function to hex-dump a given byte array

hexdump.cs

/// <summary>
/// Dumps the given byte array as hexadecimal text viewer
/// </summary>
/// <param name="value">Byte array to be dumped</param>
public static void HexDump(this byte[] value)
{
    if ((value?.Length ?? 0) == 0)
        return;

    ConsoleColor fc = Console.ForegroundColor;
    ConsoleColor bc = Console.BackgroundColor;
    bool cv = Console.CursorVisible;
    int w = Console.WindowWidth - 16;
    int l = (w - 3) / 4;
    byte b;

    l -= l % 16;

    int h = (int)Math.Ceiling((float)value.Length / l);

    Console.CursorVisible = false;
    Console.WriteLine();
    Console.ForegroundColor = ConsoleColor.White;
    Console.BackgroundColor = ConsoleColor.Black;
    Console.WriteLine($" {value.Length} bytes:\n\n");
    Console.CursorLeft += 8;

    for (int j = 0; j <= l; j++)
    {
        Console.CursorTop--;
        Console.Write($"  {j / 16:x}");
        Console.CursorLeft -= 3;
        Console.CursorTop++;
        Console.Write($"  {j % 16:x}");
    }

    Console.WriteLine();

    fixed (byte* ptr = value)
        for (int i = 0; i < h; i++)
        {
            Console.Write($"{i * l:x8}:  ");

            bool cflag;

            for (int j = 0; (j < l) && (i * l + j < value.Length); j++)
            {
                b = ptr[i * l + j];
                cflag = *((int*)(ptr + i * l + (j / 4) * 4)) != 0;

                Console.ForegroundColor = b == 0 ? cflag ? ConsoleColor.White : ConsoleColor.DarkGray : ConsoleColor.Yellow;
                Console.Write($"{b:x2} ");
            }

            Console.ForegroundColor = ConsoleColor.White;
            Console.CursorLeft = 3 * l + 11;
            Console.Write("| ");

            for (int j = 0; (j < l) && (i * l + j < value.Length); j++)
            {
                byte _ = ptr[i * l + j];
                bool ctrl = (_ < 0x20) || ((_ >= 0x7f) && (_ <= 0xa0));

                if (ctrl)
                    Console.ForegroundColor = ConsoleColor.Red;

                Console.Write(ctrl ? '.' : (char)_);
                Console.ForegroundColor = ConsoleColor.White;
            }

            Console.Write("\n");
        }

    Console.WriteLine();
    Console.CursorVisible = cv;
    Console.ForegroundColor = fc;
    Console.BackgroundColor = bc;
}