1 ## Copyright (C) 2007-2012 David Bateman
3 ## This file is part of Octave.
5 ## Octave is free software; you can redistribute it and/or modify it
6 ## under the terms of the GNU General Public License as published by
7 ## the Free Software Foundation; either version 3 of the License, or (at
8 ## your option) any later version.
10 ## Octave is distributed in the hope that it will be useful, but
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 ## General Public License for more details.
15 ## You should have received a copy of the GNU General Public License
16 ## along with Octave; see the file COPYING. If not, see
17 ## <http://www.gnu.org/licenses/>.
20 ## @deftypefn {Function File} {} swapbytes (@var{x})
21 ## Swap the byte order on values, converting from little endian to big
22 ## endian and vice versa. For example:
26 ## swapbytes (uint16 (1:4))
27 ## @result{} [ 256 512 768 1024]
31 ## @seealso{typecast, cast}
34 function y = swapbytes (x)
41 if (strcmp (clx, "int8") || strcmp (clx, "uint8") || isempty (x))
44 if (strcmp (clx, "int16") || strcmp (clx, "uint16"))
46 elseif (strcmp (clx, "int32") || strcmp (clx, "uint32"))
48 elseif (strcmp (clx, "int64") || strcmp (clx, "uint64")
49 || strcmp (clx, "double"))
52 error ("swapbytes: invalid class of object");
54 y = reshape (typecast (reshape (typecast (x(:), "uint8"), nb, numel (x))
55 ([nb : -1 : 1], :) (:), clx), size(x));
61 %!assert (double (swapbytes (uint16 (1:4))), [256 512 768 1024])
62 %!error (swapbytes ())
63 %!error (swapbytes (1, 2))