sireader.py 文件源码

def _decode_cardnr(number):
        """Decodes a 4 byte cardnr to an int. SI-Card numbering is a bit odd:

           SI-Card 5:
              - byte 0:   always 0 (not stored on the card)
              - byte 1:   card series (stored on the card as CNS)
              - byte 2,3: card number
              - printed:  100'000*CNS + card number
              - nr range: 1-65'000 + 200'001-265'000 + 300'001-365'000 + 400'001-465'000

           SI-Card 6/6*/8/9/10/11/pCard/tCard/fCard/SIAC1:
              - byte 0:   card series (SI6:00, SI9:01, SI8:02, pCard:04, tCard:06, fCard:0E, SI10+SI11+SIAC1:0F)
              - byte 1-3: card number
              - printed:  only card number
              - nr range:
                  - SI6: 500'000-999'999 + 2'003'000-2'003'400 (WM2003) + 16'711'680-16'777'215 (SI6*)
                  - SI9: 1'000'000-1'999'999, SI8: 2'000'000-2'999'999
                  - pCard: 4'000'000-4'999'999, tCard: 6'000'000-6'999'999
                  - SI10: 7'000'000-7'999'999, SIAC1: 8'000'000-8'999'999
                  - SI11: 9'000'000-9'999'999, fCard: 14'000'000-14'999'999

           The card nr ranges guarantee that no ambigous values are possible
           (500'000 = 0x07A120 > 0x04FFFF = 465'535 = highest technically possible value on a SI5)
        """

        if number[0:1] != b'\x00':
            raise SIReaderException('Unknown card series')

        nr = SIReader._to_int(number[1:4])
        if nr < 500000:
            # SI5 card
            ret = SIReader._to_int(number[2:4])
            if byte2int(number[1]) < 2:
                # Card series 0 and 1 do not have the 0/1 printed on the card
                return ret
            else:
                return byte2int(number[1]) * 100000 + ret
        else:
            # SI6/8/9
            return nr