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qrsender.sh
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qrsender.sh
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#!/bin/bash
# Copyright 2023 bin jin
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
[ -e "$1" ] || { printf "target file '$1' not exist\n" >&2; exit 1; }
which qrencode >/dev/null 2>/dev/null || { printf "'qrencode' command not found or not in '\$PATH'\n" >&2; exit 1; }
get_current_rows() {
set -- $(stty size)
set -- $(($1 - 1)) $(($2 / 2 + 1))
[ $1 -lt $2 ] && printf $1 || printf $2
}
all_ascii_qr_rows=(`seq 29 4 185`) # ascii_qr_cols_by_version[$version - 1]=$((${all_ascii_qr_rows[$version - 1]} * 2))
# for i in {2..40}; do cat "$1" | gzip | base64 | while read l; do [ $((++c % $i)) == 1 ] && { printf "$n" | qrencode -o - -t ascii | awk 'END{print NR, length($0)}' || break; unset n; }; n="$n$l\n"; done | awk -v i=$i 'BEGIN{m=0};{t=strtonum($1);if(t > m) m = t}END{print i "," m}'; done
# base64 rows: 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38
max_qr_rows=(41 57 65 69 77 85 89 93 97 101 105 113 117 117 121 125 129 133 137 141 141 145 149 153 153 157 161 161 165 169 169 173 173 177 181 181 185 185) # 76/64 same for base64 & openssl base & certutil.exe -decode
current_rows=`get_current_rows`;
[ $current_rows -lt $((${max_qr_rows[0]} + 4)) ] && {
printf "window is too small\n" >&2
exit 1
}
unset default_step
[ $current_rows -ge ${max_qr_rows[${#max_qr_rows[@]} - 4]} ] && default_step=$((${#max_qr_rows[@]} - 2)) || for i in ${!max_qr_rows[@]}; do
[ $current_rows -ge ${max_qr_rows[$i]} -a $current_rows -le ${max_qr_rows[$i + 1]} ] && {
default_step=$(($i + 1));
break
}
done
input_path="$1" base64_tmp_file=".${input_path##*/}-$$.log";
shift;
unset sleep_sec step_rows index_list || exit 1
while getopts ":s:w:l:" opt; do
case "${opt}" in
s) step_rows="$OPTARG";;
w) sleep_sec="$OPTARG";;
l) index_list="$OPTARG";;
*) printf "Usage: $0 [target_file] -w [sleep_sec] -s [step_rows] -l [index_list/range]\n\n" >&2; exit 1;;
esac
done
if [ "$step_rows" ]; then
[ $step_rows -gt $default_step ] && {
printf "window is too small to can not use step_rows: '$step_rows'\n" >&2;
exit 1
}
else
step_rows=$default_step
fi
if [ -f "$input_path" ]; then
cat "$input_path" | { [ "${input_path##*.}" == "gz" ] && cat || gzip; }
elif [ -d "$input_path" ]; then
tar -czf - "$input_path"
else
printf "unknown input type '$input_path'.\n" >&2;
exit 1
fi | base64 > "$base64_tmp_file";
input_type=f; [ -d "$input_path" ] && { input_path="${input_path%/}"; input_type=d; }
sleep_sec=${sleep_sec:-'0.9'};
base64_sha1=$(sha1sum "$base64_tmp_file") max_nr=$(grep -c '^[0-9A-Za-z+/=]\+$' "$base64_tmp_file")
qr_count=$((max_nr / step_rows + 1)); [ $((max_nr % step_rows)) == 0 ] && qr_count=$((qr_count - 1))
begin_timestamp=$(date +%s)
# header
printf "# begin ${base64_sha1%% *} $input_path\nbegin_timestamp=$begin_timestamp,\nsleep_sec=$sleep_sec,\nstep_rows=$step_rows,\nqr_count=$qr_count,\nmax_nr=$max_nr\ninput_type=$input_type\n";
printf "# begin ${base64_sha1%% *} $input_path\n$begin_timestamp,$sleep_sec,$step_rows,$qr_count,$max_nr,$input_type" | qrencode -o - -t ansi256
sleep $sleep_sec; sleep 0.8;
rows_cols=$(stty size);
printf -v blank_lines "%$((${rows_cols% *} - ${max_qr_rows[$step_rows - 1]}))s" " ";
printf -v blank_lines %s" ${blank_lines// /\\n}";
printf -v blank_lines_max "%$((${rows_cols% *} - ${all_ascii_qr_rows[0]}))s" " ";
printf -v blank_lines_max %s" ${blank_lines_max// /\\n}";
trap '_kill_awk $?' SIGINT
_kill_awk() { kill $awk_pid && rm -f "$base64_tmp_file"; exit 0; }
awk \
-v step=$step_rows \
-v qr_count=$qr_count \
-v blank_lines="$blank_lines" \
-v blank_lines_max="$blank_lines_max" \
-v sleep_sec=$sleep_sec \
-v index_list="$index_list" \
'BEGIN{
begin = 0;
if (index_list) {
if (match(index_list, /^[[:space:]]*[0-9]+[[:space:]]*[+-]/)) {
begin = strtonum(gensub(/^[[:space:]]+/, "", 1, gensub(/[[:space:]]*[+-].*/, "", 1, index_list)));
index_list = ""
} else {
split(index_list, tmp_arr, /[[:space:]]+/);
for(i in tmp_arr) idx_map[tmp_arr[i]]=1
}
}
};
{
out=out "" $0 "\n";
if(NR % step == 0) {
idx++;
if (!index_list || idx_map[idx]) if (idx >= begin)
system("printf \"" blank_lines "\n# " idx " / " qr_count "\n\"; printf \"# " idx "\n" out "\" | qrencode -o - -t ansi256; sleep " sleep_sec);
out=""
}
};
END{
idx++;
if (out != "") if (!index_list || idx_map[idx]) if (idx >= begin)
system("printf \"" blank_lines_max "\n# " idx " / " qr_count "\n\"; printf \"# " idx "\n" out "\" | qrencode -o - -t ansi256; sleep " sleep_sec)
}' "$base64_tmp_file" &
awk_pid=$!
wait $awk_pid;
end_timestamp=$(date +%s)
use_sec=$((end_timestamp - $begin_timestamp))
printf "$blank_lines_max\n# end / ${use_sec}s\n";
printf "# end / $end_timestamp" | qrencode -o - -t ansi256;
sleep $sleep_sec; sleep 0.8;
printf -v blank_lines_all "%${rows_cols% *}s" " ";
printf -v blank_lines_all %s" ${blank_lines_all// /\\n}";
printf "$blank_lines_all\n# complete! sending the file '$input_path', using $qr_count + 2 QR codes, took $use_sec seconds.\n"
rm -f "$base64_tmp_file";