function [vertex_coords, faces] = read_surf(fname)
%
% [vertex_coords, faces] = read_surf(fname)
% reads a the vertex coordinates and face lists from a surface file
% note that reading the faces from a quad file can take a very long
% time due to the goofy format that they are stored in. If the faces
% output variable is not specified, they will not be read so it
% should execute pretty quickly.
%

%
% read_surf.m
%
% Original Author: Bruce Fischl
% CVS Revision Info:
% $Author: nicks $
% $Date: 2007/01/10 22:55:10 $
% $Revision: 1.3 $
%
% Copyright (C) 2002-2007,
% The General Hospital Corporation (Boston, MA).
% All rights reserved.
%
% Distribution, usage and copying of this software is covered under the
% terms found in the License Agreement file named 'COPYING' found in the
% FreeSurfer source code root directory, and duplicated here:
% https://surfer.nmr.mgh.harvard.edu/fswiki/FreeSurferOpenSourceLicense
%
% General inquiries: freesurfer@nmr.mgh.harvard.edu
% Bug reports: analysis-bugs@nmr.mgh.harvard.edu
%

%fid = fopen(fname, 'r') ;
%nvertices = fscanf(fid, '%d', 1);
%all = fscanf(fid, '%d %f %f %f %f\n', [5, nvertices]) ;
%curv = all(5, :)' ;

% open it as a big-endian file

%QUAD_FILE_MAGIC_NUMBER = (-1 & 0x00ffffff) ;
%NEW_QUAD_FILE_MAGIC_NUMBER = (-3 & 0x00ffffff) ;

TRIANGLE_FILE_MAGIC_NUMBER = 16777214 ;
QUAD_FILE_MAGIC_NUMBER = 16777215 ;

fid = fopen(fname, 'rb', 'b') ;
if (fid < 0)
str = sprintf('could not open curvature file %s.', fname) ;
error(str) ;
end
magic = fread3(fid) ;

if(magic == QUAD_FILE_MAGIC_NUMBER)
vnum = fread3(fid) ;
fnum = fread3(fid) ;
vertex_coords = fread(fid, vnum*3, 'int16') ./ 100 ;
if (nargout > 1)
for i=1:fnum
for n=1:4
faces(i,n) = fread3(fid) ;
end
end
end
elseif (magic == TRIANGLE_FILE_MAGIC_NUMBER)
fgets(fid) ;
fgets(fid) ;
vnum = fread(fid, 1, 'int32') ;
fnum = fread(fid, 1, 'int32') ;
vertex_coords = fread(fid, vnum*3, 'float32') ;
faces = fread(fid, fnum*3, 'int32') ;
faces = reshape(faces, 3, fnum)' ;
end

vertex_coords = reshape(vertex_coords, 3, vnum)' ;
fclose(fid) ;