KDE PIM/KItinerary/Thalys Barcode: Difference between revisions
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* always exactly 114 byte | * always exactly 114 byte | ||
* all binary, there are no recognizable ASCII strings in this | * all binary, there are no recognizable ASCII strings in this | ||
* there's | * there's two 14-15 byte variable lengths blocks towards the end with very high entropy, possibly some kind of signature | ||
* based on currently only 4 samples, so there's limited confidence in this | * based on currently only 4 samples, so there's limited confidence in this | ||
* 0:4 - 2:1 (14 bit) is "3018", which is the UIC operator code of Thalys. This matches Appendix C of ANNEX B.6 of TAP TSI, but unfortunately only for the first 18 bit it seems. Might still mean a similar encoding is used, but in a different layout. | * 0:4 - 2:1 (14 bit) is "3018", which is the UIC operator code of Thalys. This matches Appendix C of ANNEX B.6 of TAP TSI, but unfortunately only for the first 18 bit it seems. Might still mean a similar encoding is used, but in a different layout. | ||
* correlation between samples suggests 20-26 contain departure and arrival stations in an so | * correlation between samples suggests 20-26 contain departure and arrival stations in an so far unknown encoding | ||
= Bit Layout = | = Bit Layout = | ||
| Line 29: | Line 29: | ||
| 55:0 - 58:7 || 0xc0 0a 80 30 || || fixed in all samples | | 55:0 - 58:7 || 0xc0 0a 80 30 || || fixed in all samples | ||
|- | |- | ||
| 59:0 - | | 59:0 - 59:7 || 0x2C or 0x2E || || | ||
|- | |- | ||
| | |} | ||
After this there follow two blocks with the following variable length layout: | |||
{| class="wikitable" | |||
! Byte[:Bit] (MSB) !! Content !! Meaning !! Notes | |||
|- | |||
| 0:0 - 0:7 || 0x02 || || fixed | |||
|- | |||
| 1:0 - 1:7 || 8bit uint || length || | |||
|- | |||
| N bytes || || || high entropy content | |||
|- | |- | ||
|} | |} | ||
Remaining bytes are filled by null until reaching 114 bytes. | |||
Revision as of 18:51, 8 February 2020
General Observations
- always exactly 114 byte
- all binary, there are no recognizable ASCII strings in this
- there's two 14-15 byte variable lengths blocks towards the end with very high entropy, possibly some kind of signature
- based on currently only 4 samples, so there's limited confidence in this
- 0:4 - 2:1 (14 bit) is "3018", which is the UIC operator code of Thalys. This matches Appendix C of ANNEX B.6 of TAP TSI, but unfortunately only for the first 18 bit it seems. Might still mean a similar encoding is used, but in a different layout.
- correlation between samples suggests 20-26 contain departure and arrival stations in an so far unknown encoding
Bit Layout
| Byte[:Bit] (MSB) | Content | Meaning | Notes |
|---|---|---|---|
| 0:0 - 4:7 | 0x32 F2 84 20 40 | fixed in all samples | |
| 5:0 - 5:7 | 0x01 or 0x02 | class | |
| 6:0 - 8:7 | null | ||
| 9:0 - 35:7 | TODO | ||
| 36:0 - 42:7 | null | ||
| 43:0 - 49:7 | 0x9a 0c 28 82 c8 22 b2 | fixed in all samples | |
| 50:0 - 54:7 | TODO | ||
| 55:0 - 58:7 | 0xc0 0a 80 30 | fixed in all samples | |
| 59:0 - 59:7 | 0x2C or 0x2E |
After this there follow two blocks with the following variable length layout:
| Byte[:Bit] (MSB) | Content | Meaning | Notes |
|---|---|---|---|
| 0:0 - 0:7 | 0x02 | fixed | |
| 1:0 - 1:7 | 8bit uint | length | |
| N bytes | high entropy content |
Remaining bytes are filled by null until reaching 114 bytes.