sgn2pdf

#!/bin/bash
#
# sgn2pdf
# by Eyal Rozenberg <eyalroz@technion.ac.il>
# version: 2016-12-27
#
# Extracts a PDF file from an Israeli courts' .sgn PDF document envelope
#
# 
#    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.
#
#    The text of the GNU General Public License is available at:
#    <http://www.gnu.org/licenses/>.
#
#
# TODO: Support taking the input and output filenames from the command-line arguments

exec 3<&0 # tie (new) file descriptor 3 to what is currently the standard input
exec 4>&1 # tie (new) file descriptor 4 to what is currently the standard output

if [[ $# > 0 ]]; then
    exec 3<$1
    shift
fi
if [[ $# > 0 ]]; then
    exec 4>$1
    shift
fi
exec <&3 >&4
sed -r 's/^.*<DocumentContent[^>]*>//; s/<\/Document.*$//;' | base64 -d -i >&4