Mercurial > octave
view scripts/miscellaneous/swapbytes.m @ 28207:ab60e78d235c
maint: merge stable to default.
author | Rik <rik@octave.org> |
---|---|
date | Sat, 11 Apr 2020 16:06:19 -0700 |
parents | bd51beb6205e |
children | d8318c12d903 0a5b15007766 |
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######################################################################## ## ## Copyright (C) 2007-2020 The Octave Project Developers ## ## See the file COPYRIGHT.md in the top-level directory of this ## distribution or <https://octave.org/copyright/>. ## ## This file is part of Octave. ## ## Octave is free software: you can redistribute it and/or modify it ## under the terms of the GNU General Public License as published by ## the Free Software Foundation, either version 3 of the License, or ## (at your option) any later version. ## ## Octave is distributed in the hope that it will be useful, but ## WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ## GNU General Public License for more details. ## ## You should have received a copy of the GNU General Public License ## along with Octave; see the file COPYING. If not, see ## <https://www.gnu.org/licenses/>. ## ######################################################################## ## -*- texinfo -*- ## @deftypefn {} {} swapbytes (@var{x}) ## Swap the byte order on values, converting from little endian to big endian ## and vice versa. ## ## For example: ## ## @example ## @group ## swapbytes (uint16 (1:4)) ## @result{} 256 512 768 1024 ## @end group ## @end example ## ## @seealso{typecast, cast} ## @end deftypefn function y = swapbytes (x) if (nargin != 1) print_usage (); endif cls = class (x); if (strcmp (cls, "int8") || strcmp (cls, "uint8") || isempty (x)) y = x; else if (strcmp (cls, "int16") || strcmp (cls, "uint16")) nb = 2; elseif (strcmp (cls, "single") || strcmp (cls, "int32") || strcmp (cls, "uint32")) nb = 4; elseif (strcmp (cls, "double") || strcmp (cls, "int64") || strcmp (cls, "uint64")) nb = 8; else error ("swapbytes: invalid object of class '%s'", cls); endif y = reshape (typecast (reshape (typecast (x(:), "uint8"), nb, numel (x)) ([nb : -1 : 1], :) (:), cls), size (x)); endif endfunction %!assert (swapbytes (uint16 (1:4)), uint16 ([256 512 768 1024])) %!test %! assert (swapbytes (swapbytes (pi)), pi); %! assert (swapbytes (swapbytes (single (pi))), single (pi)); ## Test input validation %!error swapbytes () %!error swapbytes (1, 2) %!error <invalid object of class 'cell'> swapbytes ({1})