You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: inflate_file.m
    path of file: ./repos/CBIG/external_packages/matlab/non_default_packages/cifti-matlab-WashU-gradient/private
    
    the code of the file until where you have to start completion: function outputfile = inflate_file(inputfile)

% INFLATE_FILE helper function to uncompress a compressed file of arbitrary
% compression type. Returns the full path to the extracted file or
% directory, which will be located in a temporary location.

% Copyright (C) 2012 Eelke Spaak
%
% This file is part of FieldTrip, see http://www.fieldtriptoolbox.org
% for the documentation and details.
%
%    FieldTrip is free software: you can redistribute it and/or modify

    
function outputfile = inflate_file(inputfile)

% INFLATE_FILE helper function to uncompress a compressed file of arbitrary
% compression type. Returns the full path to the extracted file or
% directory, which will be located in a temporary location.

% Copyright (C) 2012 Eelke Spaak
%
% This file is part of FieldTrip, see http://www.fieldtriptoolbox.org
% for the documentation and details.
%
%    FieldTrip 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.
%
%    FieldTrip 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 FieldTrip. If not, see <http://www.gnu.org/licenses/>.
%
% $Id$

% use a cache to prevent extracting the same file multiple times
persistent extractcache;
inputfilemd5 = fixname(CalcMD5(inputfile));
if isfield(extractcache, inputfilemd5)
  outputfile = extractcache.(inputfilemd5);
  if exist(outputfile, 'file') % checks for files or folders
    fprintf('compressed dataset has already been extracted to %s\n', outputfile);
    return;
  else
    % apparently the file is gone
    extractcache = rmfield(extractcache, inputfilemd5);
  end