static char[] _Base64_Array(ReadOnlySpan <char> encoded)
{
char[] a = AMemoryArray.Char_(encoded.Length);
for (int i = 0; i < encoded.Length; i++)
{
char c = encoded[i];
a[i] = c switch { '_' => '/', '-' => '+', _ => c, };
}
return(a);
}
/// <summary>
/// Converts hex-encoded string to binary data as byte[].
/// </summary>
/// <param name="encoded">String or char[] or span of string/array/memory containing Hex-encoded data.</param>
/// <remarks>
/// Skips spaces and other non-hex-digit characters. Example: "01 23 46 67" is the same as "01234667".
/// The number of hex-digit characters should be divisible by 2, else the last character is ignored.
/// </remarks>
public static byte[] HexDecode(ReadOnlySpan <char> encoded)
{
int n = encoded.Length / 2;
fixed(byte *p = AMemoryArray.Byte_(n))
{
n = HexDecode(encoded, p, n);
var r = new byte[n];
Marshal.Copy((IntPtr)p, r, 0, n);
return(r);
}
}
