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fload.cc

/* Copyright (C) 2009  VZLU Prague, a.s., Czech Republic
 * 
 * Author: Jaroslav Hajek <highegg@gmail.com>
 * 
 * This file is part of OctaveForge.
 * 
 * This program 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.
 * 
 * This program 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 this software; see the file COPYING.  If not, see
 * <http://www.gnu.org/licenses/>.  */

#include <octave/oct.h>
#include <octave/mach-info.h>
#include <octave/ls-oct-binary.h>
#include <octave/oct-stream.h>

DEFUN_DLD (fload, args, ,
  "-*- texinfo -*-\n\
@deftypefn {Loadable Function} {@var{var} =} fload (@var{fid})\n\
Loads a single variable of any type from a binary stream, where it was previously\n\
saved with fsave.\n\
@end deftypefn")
{
  octave_value retval;
  int nargin = args.length ();

  if (nargin == 1)
    {
      int fid = octave_stream_list::get_file_number (args (0));

      octave_stream octs = octave_stream_list::lookup (fid, "fload");
      std::istream *is = octs.input_stream ();

      if (is)
        {
          // FIXME: these are dummies. It would be nice to get rid of them and call
          // a more low-level interface, but there doesn't seem to be a more suitable
          // one in Octave, that still does the automatic type lookup.
          std::string doc, filename;
          bool swap = false, global;
          read_binary_data (*is, swap, oct_mach_info::native_float_format (),
                            filename, global, retval, doc);
          if (retval.is_undefined ())
            error ("fload: failed to extract value");
        }
      else
        error ("fload: stream not opened for reading.");
    }
  else
    print_usage ();

  return retval;
}

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