/usr/share/liblouis/tables/controlchars.cti is in liblouis-data 3.0.0-3+deb9u4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | # liblouis: some control characters
# Based on the Linux screenreader BRLTTY, copyright (C) 1999-2006 by
# The BRLTTY Team
#
# Copyright (C) 2004-2006 ViewPlus Technologies, Inc. www.viewplus.com
# Copyright (C) 2004-2006 JJB Software, Inc. www.jjb-software.com
#
# This file is part of liblouis.
#
# liblouis is free software: you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation, either version 2.1 of the
# License, or (at your option) any later version.
#
# liblouis 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with liblouis. If not, see
# <http://www.gnu.org/licenses/>.
space \x000a a1 newline
space \x000c a2 forms feed
space \x000d a3 carriage return
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