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#!/bin/bash
. lib.sh
#
# *** Description ***
#
# generate header with correct json of maximal size in primary slot.
# Secondary header is broken on purpose.
#
# $1 full target dir
# $2 full source luks2 image
PATTERN="\"config\":{"
KEY="\"config_key\":\""
function generate()
{
read -r json_str < $TMPDIR/json0
json_len=${#json_str}
pindex=$(strindex $json_str $PATTERN)
test $pindex -gt 0 || exit 2
offset=${#PATTERN}
offset=$((offset+pindex))
key_len=${#KEY}
remain=$((LUKS2_JSON_SIZE*512-json_len-key_len-2)) # -2: closing '"' and terminating '\0'
if [ ${json_str:offset:1} = "}" ]; then
format_str="%s%s%s"
else
format_str="%s%s,%s"
remain=$((remain-1)) # also count with separating ','
fi
test $remain -gt 0 || exit 2
fill=$(repeat_str "X" $remain)"\""
printf $format_str $KEY $fill ${json_str:$offset} | _dd of=$TMPDIR/json0 bs=1 seek=$offset conv=notrunc
lib_mangle_json_hdr0_kill_hdr1
}
function check()
{
lib_hdr1_killed || exit 2
lib_hdr0_checksum || exit 2
read_luks2_json0 $TGT_IMG $TMPDIR/json_res0
#json_str_res0=$(< $TMPDIR/json_res0)
read -r json_str_res0 < $TMPDIR/json_res0
test ${#json_str_res0} -eq $((LUKS2_JSON_SIZE*512-1)) || exit 2
}
lib_prepare $@
generate
check
lib_cleanup
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