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: read_wdq_header.m
    path of file: ./repos/malini/Codes/deconvolution - model/spm8/external/fieldtrip/fileio/private
    
    the code of the file until where you have to start completion: function [hdr] = read_wdq_header(filename)

% READ_WDQ_HEADER reads header information from wdq files
%
% Use as
%  [hdr] = read_wdq_header(filename)
%

% Copyright (C) 2011, Jan-Mathijs Schoffelen
%
% This file is part of FieldTrip, see http://www.ru.nl/neuroimaging/fieldtrip
% 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: read_wdq_header.m 7123 2012-12-06 21:21:38Z roboos $

% information about how to interpret the file are taken from the document
% 'CODAS data storage format'

    
function [hdr] = read_wdq_header(filename)

% READ_WDQ_HEADER reads header information from wdq files
%
% Use as
%  [hdr] = read_wdq_header(filename)
%

% Copyright (C) 2011, Jan-Mathijs Schoffelen
%
% This file is part of FieldTrip, see http://www.ru.nl/neuroimaging/fieldtrip
% 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: read_wdq_header.m 7123 2012-12-06 21:21:38Z roboos $

% information about how to interpret the file are taken from the document
% 'CODAS data storage format'

fid = fopen(filename, 'r');
%tmp = fread(fid, 110); % the first 110 bytes are always interpretable equally
hdr = [];
hdr.nchan         = fread(fid, 1, 'uint16');
hdr.nchan         = hdr.nchan - bitand(hdr.nchan, 32);
i2                = fread(fid, 1, 'uint16');
hdr.offset        = fread(fid, 1, 'uint8');
hdr.nbyteschanhdr = fread(fid, 1, 'uint8');
hdr.nbyteshdr     = fread(fid, 1, 'int16');
hdr.nbytesdat     = fread(fid, 1, 'uint32'); %FIXME only for unpacked files
hdr.nbytestrailer1 = fread(fid, 1, 'uint32');
hdr.nbytestrailer2 = fread(fid, 1, 'uint16');
i9  = fread(fid, 1, 'uint16'); % not used
i10 = fread(fid, 1, 'uint16'); % not used
i11 = fread(fid, 1, 'int16');
i12 = fread(fid, 4, 'int8');
i13 = fread(fid, 1, 'double');

% FIXME there seems to be a discrepancy here, according to the
% documentation it should be the next (commented) line. according to the
% file I have at hand it should be the uncommented line.
%hdr.fsample        = double(hdr.nchan)./i13;
hdr.fsample = 1./i13;
i14 = fread(fid, 1, 'uint32');
i15 = fread(fid, 1, 'uint32');
i16 = fread(fid, 1, 'uint32');
i17 = fread(fid, 1, 'uint32');
i18 = fread(fid, 1, 'uint32');
i19 = fread(fid, 2, 'uint16');
i20 = fread(fid, 1, 'int16');
i21 = fread(fid, 1, 'int16');
i22 = fread(fid, 1, 'int8');
i23 = fread(fid, 1, 'int8');
i24 = fread(fid, 1, 'int8');
i25 = fread(fid, 1, 'int8');
i26 = fread(fid, 32, 'int8');
i27 = fread(fid, 1, 'uint16');
i28 = fread(fid, 1, 'uint8');
empty = fread(fid, 1, 'uint8');
i29 = fread(fid, 1, 'int8');
i30 = fread(fid, 1, 'int8');
i31 = fread(fid, 1, 'int8');
empty = fread(fid, 1, 'uint8');
i32 = fread(fid, 1, 'int8');
i33 = fread(fid, 1, 'int8');

% interpret relevant stuff from i27
% other stuff may or may not be relevant
hdr.ispacked  = bitand(i27, 2^15)>0;
hdr.lowchan   = bitand(i27, 2^9) >0;

% get channel info
for k = 1:(hdr.nbyteshdr-hdr.offset-2)/hdr.nbyteschanhdr
  fseek(fid, hdr.offset + (k-1)*hdr.nbyteschanhdr, 'bof');
  chanhdr(k).scalingslope     = fread(fid, 1, 'float');
  chanhdr(k).scalingintercept = fread(fid, 1, 'float');
  chanhdr(k).scale            = fread(fid, 1, 'double');
  chanhdr(k).intercept        = fread(fid, 1, 'double');
  chanhdr(k).unit             = fread(fid, 1, 'uint8=>char');
  fread(fid, 1, 'uint8');
  fread(fid, 1, 'uint8'); % may be relevant for packed files
  chanhdr(k).channr = fread(fid, 1, 'uint8');
  chanhdr(k).label  = num2str(k);
end