/usr/share/octave/packages/io-2.0.2/private/__POI_spsh_open__.m is in octave-io 2.0.2-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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##
## 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 Octave; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## __POI_xlsopen__ - Internal function for opening an xls(x) file using Java/Apache POI
## Author: Philip Nienhuis <prnienhuis@users.sf.net>
## Created: 2012-10-07
##
## Updates (possibly earlier in xlsopen):
## 2010-01-03 Added OOXML support
## 2010-01-16 Removed echoeing debug info in POI stanza
## 2010-09-27 Improved POI help message for unrecognized .xls format to hint for BIFF5/JXL
## 2010-11-08 Tested with POI 3.7 (OK)
## 2012-06-07 Fixed mixed-up lastintf assignments for POI and JXL
## 2012-10-24 Style fixes; added UNO to fall-back for BIFF5 formats
## 2013-01-20 Adapted to ML-compatible Java calls
## 2013-12-06 Updated copyright strings
## 2013-12-27 Use one variable for processed file type
function [ xls, xlssupport, lastintf ] = __POI_spsh_open__ (xls, xwrite, filename, xlssupport, ftype, xlsinterfaces)
## Get handle to workbook
try
if (xwrite > 2)
if (ftype == 1)
wb = javaObject ("org.apache.poi.hssf.usermodel.HSSFWorkbook");
elseif (ftype == 2)
wb = javaObject ("org.apache.poi.xssf.usermodel.XSSFWorkbook");
endif
xls.app = "new_POI";
else
xlsin = javaObject ("java.io.FileInputStream", filename);
wb = javaMethod ("create", ...
"org.apache.poi.ss.usermodel.WorkbookFactory",...
xlsin);
xls.app = xlsin;
endif
xls.xtype = "POI";
xls.workbook = wb;
xls.filename = filename;
xlssupport += 2;
lastintf = "POI";
catch
clear xlsin;
if (ftype == 1 && (xlsinterfaces.JXL || xlsinterfaces.UNO))
printf ...
(["Couldn't open file %s using POI;\n" ...
"trying Excel'95 format with JXL or UNO...\n"], filename);
endif
end_try_catch
endfunction
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