Difference between revisions of "KDE PIM/KItinerary/Trenitalia Barcode"

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(Bit Layout)
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| 24:3 - 29:7 || null || ||
 
| 24:3 - 29:7 || null || ||
 
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| 30:0 - 38:7 || || || null if no PNR present, seems to contain seat number?
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| 30:0 - 31:1 || || || null if no PNR present, content unknown
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| 31:2 - 32:0 || 7 bit uint || seat number || seat row for trains with an airplane-like numbering scheme
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| 32:1 - 38:7 || || || null if no PNR present, content unknown
 
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| 39:0 -42:7 || null ||  ||
 
| 39:0 -42:7 || null ||  ||

Revision as of 11:10, 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 - 13:4 null
13:5 - 14:3 100 xxxx 0000 for Italian stations codes (UIC 83.....), 0111 for international destination?
14:4 - 17:3 24 bit uint UIC station code of departure only for Italian destinations apparently
17:4 - 18:2 100 xxxx see above
18:3 - 21:2 24 bit uint UIC station code of arrival see above
21:3 - 22:1 unknown 22:1 seems 0 in all samples, the rest varies
22:2 - 24:1 16 bit uint train number could be as little as 14 bits too, no train number > 16k has been observed
24:3 - 29:7 null
30:0 - 31:1 null if no PNR present, content unknown
31:2 - 32:0 7 bit uint seat number seat row for trains with an airplane-like numbering scheme
32:1 - 38:7 null if no PNR present, content unknown
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

Open Questions

  • there is one sample where the departure and arrival UIC station codes are equal, contrary to what's in the corresponding PDF
  • for international destinations the station code does not actually seem to be a valid UIC station code, but there is only one sample to back this up so far

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