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## distribution or <https://octave.org/copyright/>.
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## -*- texinfo -*-
## @deftypefn {} {@var{out_vec} =} matlab.net.base64decode (@var{b64_str})
##
## Convert base64 encoded @var{b64_str} to uint8 vector @var{out_vec}.
##
## The input @var{b64_str} must be a string vector.
## The output @var{out_vec} will be a uint8 vector that is decoded
## according to RFC 4648.
##
## @seealso{matlab.net.base64encode, base64_decode, base64_encode,
## native2unicode}
## @end deftypefn

function out_vec = base64decode (b64_str)

  if (nargin != 1)
    print_usage ();
  endif

  if (! isvector (b64_str) || ! ischar (b64_str))
    error ("base64decode: B64_STR must be a base64 encoded character vector");
  endif

  out_vec = uint8 (__base64_decode_bytes__ (b64_str));

endfunction


## Test char vector input
%!assert (matlab.net.base64decode ("AQ=="), uint8 (1))
%!assert (matlab.net.base64decode ("/w=="), uint8 (255))
%!assert (matlab.net.base64decode ("AQID"), uint8 (1:3))
%!assert (matlab.net.base64decode ("YQ=="), uint8 ("a"))
%!assert (matlab.net.base64decode ("YWJjZGVmZw=="), uint8 ("abcdefg"))

## Test input validation
%!error <Invalid call> matlab.net.base64decode ()
%!error <character vector> matlab.net.base64decode (pi)
%!error <character vector> matlab.net.base64decode ({1,2})
%!error <character vector> matlab.net.base64decode ([1,2;3,4])