KDE PIM/KItinerary/Trenitalia Barcode: Difference between revisions
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* does not seem to contain signatures, checksums or compression, based on minimal bit pattern changes on adjacent tickets | * does not seem to contain signatures, checksums or compression, based on minimal bit pattern changes on adjacent tickets | ||
* a lot less null bytes when PNR/seat reservation are present (ie. highspeed train tickets?) | * a lot less null bytes when PNR/seat reservation are present (ie. highspeed train tickets?) | ||
* there is a unique, globally sequential ticket number, 2017 in the 600M range, 2019 in the 1B range, which suggests 32bit might be a bit short for this | |||
== Bit Layout == | == Bit Layout == | ||
Revision as of 08:45, 11 May 2019
General Observations
- always 67 bytes
- exactly for one passenger/leg
- does not seem to contain signatures, checksums or compression, based on minimal bit pattern changes on adjacent tickets
- a lot less null bytes when PNR/seat reservation are present (ie. highspeed train tickets?)
- there is a unique, globally sequential ticket number, 2017 in the 600M range, 2019 in the 1B range, which suggests 32bit might be a bit short for this
Bit Layout
| Byte:Bit (MSB) | Content | Meaning | Notes |
|---|---|---|---|
| 0:0 - 4:7 | 0x20 0x14 0xC2 0x08 0x10 | header? | fixed value in all samples |
| 5:0 - 7:7 | date? | varies between samples | |
| 8:0 - 12:7 | null | ||
| 13:0 - 14:3 | 0000 0100 0000 | fixed values in all samples | |
| 14:4 - 17:3 | 24 bit uint | UIC station code of departure | |
| 17:4 - 18:2 | |||
| 18:3 - 21:2 | 24 bit uint | UIC station code of arrival | |
| xx bit uint | train number | ||
| 25:0 - 29:7 | null | ||
| 30:0 - 38:7 | null if no PNR present, seems to contain seat number? | ||
| 39:0 -42:7 | null | ||
| 40:0 - 50:7 | null if no PNR present, unknown content otherwise | ||
| 51:0 - 57:7 | 0x0B 0x65 0x23 0x18 0x40 0xE6 0xC0 | fixed in all samples? | |
| 58:0 - 58:3 | null | might be part of the ticket number? | |
| 58:4 - 62:3 | 32 bit uint | ticket number | |
| 63:4 - 65:7 | null | ||
| 66:0 - 66:7 | varies between samples |