/usr/share/octave/packages/image-2.2.2/analyze75info.m is in octave-image 2.2.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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%% Copyright (C) 2012 Carnë Draug <carandraug+dev@gmail.com>
%%
%% 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 program; If not, see <http://www.gnu.org/licenses/>.
%% -*- texinfo -*-
%% @deftypefn {Function File} {@var{header} =} analyze75info (@var{filename})
%% @deftypefnx {Function File} {@var{header} =} analyze75info (@var{filename}, "ByteOrder", @var{arch})
%% Read header of an Analyze 7.5 file.
%%
%% @var{filename} must be the path for an Analyze 7.5 file or the path for a
%% directory with a single .hdr file can be specified.
%%
%% The optional argument @code{"ByteOrder"} reads the file with the specified
%% @var{arch} ("ieee-be" or "ieee-le" for IEEE big endian or IEEE
%% little endian respectively).
%%
%% @var{header} is a structure with the file information.
%%
%% @seealso{analyze75read, analyze75write}
%% @end deftypefn
function header = analyze75info (filename, varargin)
if (nargin ~= 1 && nargin ~= 3)
print_usage;
elseif (~ischar (filename))
error ('analyze75info: `filename'' must be a string');
elseif (nargin == 3)
%% Check the byteorder
if (strcmpi (varargin{1}, 'byteorder'))
error ('analyze75info: second argument must be string `ByteOrder''');
elseif (!all (strcmpi (varargin{3}, {'ieee-le', 'l', 'ieee-be', 'b'})))
error ('analyze75info: valid options for `ByteOrder'' are `ieee-le'' or `ieee-be''');
elseif (any (strcmpi (varargin{3}, {'ieee-be', 'b'})))
warning ('analyze75info: no support for big-endian. Please consider submitting a patch. Attempting to read as little-endian');
end
end
fileprefix = analyze75filename (filename);
%% finally start reading the actual file
hdrdirdata = dir ([fileprefix, '.hdr']);
imgdirdata = dir ([fileprefix, '.img']);
header.ImgFileSize = imgdirdata.bytes;
header.Filename = [fileprefix, '.hdr'];
header.FileModDate = hdrdirdata.date;
header.Format = 'Analyze';
header.FormatVersion = '7.5';
header.ColorType = 'grayscale';
header.ByteOrder = 'ieee-le';
fidH = fopen ([fileprefix, '.hdr']);
header.HdrFileSize = fread (fidH, 1, 'int32');
header.HdrDataType = char (fread (fidH, 10, 'char'))';
header.DatabaseName = char (fread (fidH, 18, 'char'))';
header.Extents = fread (fidH, 1, 'int32');
header.SessionError = fread (fidH, 1, 'int16');
header.Regular = char (fread (fidH, 1, 'char'));
unused = char (fread (fidH, 1, 'char'));
unused = fread (fidH, 1, 'int16');
header.Dimensions = zeros (size (1, 4));
header.Dimensions(1) = fread (fidH, 1, 'int16');
header.Dimensions(2) = fread (fidH, 1, 'int16');
header.Dimensions(3) = fread (fidH, 1, 'int16');
header.Dimensions(4) = fread (fidH, 1, 'int16');
unused = fread (fidH, 3, 'int16');
header.VoxelUnits = char (fread (fidH, 4, 'char'))';
header.CalibrationUnits = char (fread (fidH, 8, 'char'))';
unused = fread (fidH, 1, 'int16');
datatype = fread (fidH, 1, 'int16');
switch datatype
case 0, header.ImgDataType = 'DT_UNKNOWN';
case 1, header.ImgDataType = 'DT_BINARY';
case 2, header.ImgDataType = 'DT_UNSIGNED_CHAR';
case 4, header.ImgDataType = 'DT_SIGNED_SHORT';
case 8, header.ImgDataType = 'DT_SIGNED_INT';
case 16, header.ImgDataType = 'DT_FLOAT';
case 32, header.ImgDataType = 'DT_COMPLEX';
case 64, header.ImgDataType = 'DT_DOUBLE';
case 128, header.ImgDataType = 'DT_RGB';
case 255, header.ImgDataType = 'DT_ALL';
otherwise, warning ('analyze75: unable to detect ImgDataType');
end
header.BitDepth = fread (fidH, 1, 'int16');
unused = fread (fidH, 1, 'int16');
unused = fread (fidH, 1, 'float');
header.PixelDimensions = zeros (1, 3);
header.PixelDimensions(1) = fread (fidH, 1, 'float');
header.PixelDimensions(2) = fread (fidH, 1, 'float');
header.PixelDimensions(3) = fread (fidH, 1, 'float');
unused = fread (fidH, 4, 'float');
header.VoxelOffset = fread (fidH, 1, 'float');
unused = fread (fidH, 3, 'float');
header.CalibrationMax = fread (fidH, 1, 'float');
header.CalibrationMin = fread (fidH, 1, 'float');
header.Compressed = fread (fidH, 1, 'float');
header.Verified = fread (fidH, 1, 'float');
header.GlobalMax = fread (fidH, 1, 'int32');
header.GlobalMin = fread (fidH, 1, 'int32');
header.Descriptor = char (fread (fidH, 80, 'char'))';
header.AuxFile = char (fread (fidH, 24, 'char'))';
header.Orientation = char (fread (fidH, 1, 'char'))';
header.Originator = char (fread (fidH, 10, 'char'))';
header.Generated = char (fread (fidH, 10, 'char'))';
header.Scannumber = char (fread (fidH, 10, 'char'))';
header.PatientID = char (fread (fidH, 10, 'char'))';
header.ExposureDate = char (fread (fidH, 10, 'char'))';
header.ExposureTime = char (fread (fidH, 10, 'char'))';
unused = char (fread (fidH, 3, 'char'))';
header.Views = fread (fidH, 1, 'int32');
header.VolumesAdded = fread (fidH, 1, 'int32');
header.StartField = fread (fidH, 1, 'int32');
header.FieldSkip = fread (fidH, 1, 'int32');
header.OMax = fread (fidH, 1, 'int32');
header.OMin = fread (fidH, 1, 'int32');
header.SMax = fread (fidH, 1, 'int32');
header.SMin = fread (fidH, 1, 'int32');
header.Width = header.Dimensions(1);
header.Height = header.Dimensions(2);
fclose(fidH);
end
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