Help Interpreting Classmark and sqlite BLOB storage

Hi All, 2 (related) questions in 1 thread here: I'm looking at Chapter 10.5.1.7 of GSM 04.08, also Figure 10.5.7 there, but I am not quite getting how to interpret it in relation to either openBSC log output such as: <000d> db.c:1130 Sync Equipment IMEI=357371048322730, classmark1=33, classmark2=33 18 82 , classmark3=00 08 00 52 20 00 00 4b or equally: root@bsc:~# echo "SELECT classmark1 FROM Equipment where id='505';" | sqlite3 /var/lib/osmocom/hlr.sqlite3 | xxd 0000000: 3531 0a 51. root@bsc:~# echo "SELECT classmark2 FROM Equipment where id='505';" | sqlite3 /var/lib/osmocom/hlr.sqlite3 | xxd 0000000: 0132 1781 0a .2... root@bsc:~# echo "SELECT classmark3 FROM Equipment where id='505';" | sqlite3 /var/lib/osmocom/hlr.sqlite3 | xxd 0000000: 01ff 07ff 511f ffff 4a0a ....Q...J. Specifically, in this case, not having the mathematical theory, I don't understand how to map 01ff 07ff 511f ffff 4a0a to 00 08 00 52 20 00 00 4b It doesn't /quite/ match, but more importantly mapping to Classmark 3 Value Part Could you help me understand how to map 01ff 07ff 511f ffff 4a0a to Figure 10.5.7 BTW, I get that the BLOBs in sqlite are somehow encoded, (if that is not completely the wrong term to use) as hex_value-1, I've also noted this in the SMS table when trying to identify an sms in the sms_queue. So question part 2: what is that about? Is there an easy way I could "decode" on the command line, as in: echo "SELECT user_data FROM sms limit 1;" | sqlite3 /var/lib/osmocom/hlr.sqlite3 | some magic to display readable SMS content Any tips? Thanks!