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Boarding pass barcode decoder
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| #!/usr/bin/python2 | |
| # based on bcbp_implementation_guidev4_jun2009.pdf | |
| # and http://www.airlineinfo.com/ostpdf88/98.pdf | |
| import sys | |
| from datetime import date, timedelta | |
| from binascii import hexlify, a2b_base64 | |
| from collections import OrderedDict as odict | |
| today = date.today() | |
| def Fixed(val): | |
| def checker(encoded): | |
| if encoded != val: | |
| raise RuntimeError('expected fixed value %s but got %s' % (val, encoded)) | |
| return val | |
| return checker | |
| def Decimal(val): | |
| return int(val, 10) | |
| def Hex(val): | |
| return int(val, 16) | |
| def YearAndDayOfYear(val): | |
| assert len(val)==4 | |
| if val==' ': | |
| return None | |
| else: | |
| y0, doy = int(val[0], 10), int(val[1:], 10) | |
| d = today.replace(year=10*(today.year//10)+y0, month=1, day=1) + timedelta(days=doy-1) | |
| #if date seems far in the future it must be off by 10 years | |
| if d > today+timedelta(days=1): | |
| d = d.replace(year=d.year-10) | |
| return d | |
| # return y0, doy | |
| def DayOfYear(val): | |
| doy = int(val,10) | |
| #don't have year so guess not leap year | |
| d = date(year=2015, month=1, day=1) + timedelta(days=doy-1) | |
| return d.month, d.day | |
| # return doy | |
| class hexbytes(bytes): | |
| def __repr__(self): | |
| return hexlify(self) | |
| def Base64(val): | |
| return hexbytes(a2b_base64(val)) | |
| header_fields = [ | |
| dict(num=1, name='Format Code', size=1, unique='U', decode=Fixed('M')), | |
| dict(num=5, name='Number of Legs Encoded', size=1, unique='U', decode=Decimal), | |
| dict(num=11, name='Passenger Name', size=20, unique='U'), | |
| dict(num=253, name='Electronic Ticket Indicator', size=1, unique='U'), | |
| ] | |
| flight_mandatory_fields = [ | |
| dict(num=7, name='Operating carrier PNR Code', size=7, unique='R'), | |
| dict(num=26, name='From City Airport Code', size=3, unique='R'), | |
| dict(num=38, name='To City Airport Code', size=3, unique='R'), | |
| dict(num=42, name='Operating carrier Designator', size=3, unique='R'), | |
| dict(num=43, name='Flight Number', size=5, unique='R'), | |
| dict(num=46, name='Date of Flight (Julian Date)', size=3, unique='R', decode=DayOfYear), | |
| dict(num=71, name='Compartment Code', size=1, unique='R'), | |
| dict(num=104, name='Seat Number', size=4, unique='R'), | |
| dict(num=107, name='Check-In Sequence Number', size=5, unique='R'), | |
| dict(num=113, name='Passenger Status', size=1, unique='R'), | |
| dict(num=6, name='Field size of following variable size field', size=2, unique='R', decode=Hex), | |
| ] | |
| flight_conditional_unique_header_fields = [ | |
| dict(num=8, name='Beginning of version number', size=1, unique='U', decode=Fixed('>')), | |
| dict(num=9, name='Version number', size=1, unique='U', decode=Decimal), | |
| dict(num=10, name='Field size of following structured message - unique', size=2, unique='U', decode=Hex), | |
| ] | |
| flight_conditional_unique_body_fields = [ | |
| dict(num=15, name='Passenger Description', size=1, unique='U'), | |
| dict(num=12, name='Source of check-in', size=1, unique='U'), | |
| dict(num=14, name='Source of Boarding Pass Issuance', size=1, unique='U'), | |
| dict(num=22, name='Date of Issue of Boarding Pass (Julian Date)', size=4, unique='U', decode=YearAndDayOfYear), | |
| dict(num=16, name='Document Type', size=1, unique='U'), | |
| dict(num=21, name='Airline Designator of boarding pass issuer', size=3, unique='U'), | |
| dict(num=23, name='Baggage Tag Licence Plate Number (s)', size=13, unique='U'), | |
| ] | |
| flight_conditional_repeated_header_fields = [ | |
| dict(num=17, name='Field size of following structured message - repeated', size=2, unique='R', decode=Hex), | |
| ] | |
| flight_conditional_repeated_body_fields = [ | |
| dict(num=142, name='Airline Numeric Code', size=3, unique='R'), | |
| dict(num=143, name='Document Form/Serial Number', size=10, unique='R'), | |
| dict(num=18, name='Selectee indicator', size=1, unique='R'), | |
| dict(num=108, name='International Documentation Verification', size=1, unique='R'), | |
| dict(num=19, name='Marketing carrier designator', size=3, unique='R'), | |
| dict(num=20, name='Frequent Flyer Airline Designator', size=3, unique='R'), | |
| dict(num=236, name='Frequent Flyer Number', size=16, unique='R'), | |
| dict(num=89, name='ID/AD Indicator', size=1, unique='R'), | |
| dict(num=118, name='Free Baggage Allowance', size=3, unique='R'), | |
| ] | |
| flight_conditional_coda_fields = [ | |
| dict(num=4, name='For individual airline use', size=None, unique='R'), | |
| ] | |
| security_header_fields = [ | |
| dict(num=25, name='Beginning of Security Data', size=1, unique='U', decode=Fixed('^')), | |
| dict(num=28, name='Type of Security Data', size=1, unique='U'), | |
| dict(num=29, name='Length of Security Data', size=2, unique='U', decode=Hex), | |
| ] | |
| security_coda_fields = [ | |
| dict(num=30, name='Security Data', size=None, unique='U', decode=Base64), | |
| ] | |
| def print_and_save(bc, pos, iter_fields, stop=None, indent=''): | |
| saved = odict() | |
| if stop is None: | |
| stop = len(bc) | |
| for f in iter_fields: | |
| if f['size'] is not None: | |
| end_pos = pos+f['size'] | |
| assert end_pos <= stop | |
| else: | |
| end_pos = stop | |
| encoded = bc[pos : end_pos] | |
| saved[f['num']] = decoded = f['decode'](encoded) if 'decode' in f else encoded | |
| span = '[%03d-%03d]' % (pos, end_pos-1) if end_pos-pos>1 else '[ %03d ]' % pos | |
| print '%s%s %03d: %s: %s' % (indent, span, f['num'], f['name'], repr(decoded)) | |
| pos = end_pos | |
| if pos==stop: | |
| break | |
| return end_pos, saved | |
| bc = sys.stdin.read() | |
| print 'Header:' | |
| pos, saved = print_and_save(bc, 0, header_fields, indent=' ') | |
| nlegs = saved[5] | |
| for leg in range(1, nlegs+1): | |
| print 'Leg %d:' % leg | |
| pos, saved = print_and_save(bc, pos, flight_mandatory_fields, indent=' ') | |
| varsize = saved[6] | |
| if varsize: | |
| endpos = pos+varsize | |
| if leg==1: | |
| print " Conditional unique:" | |
| pos, saved = print_and_save(bc, pos, flight_conditional_unique_header_fields, stop=endpos, indent=' ') | |
| uver, ussize = saved[9], saved[10] | |
| if ussize: | |
| pos, _ = print_and_save(bc, pos, flight_conditional_unique_body_fields, stop=pos+ussize, indent=' ') | |
| print " Conditional repeated:" | |
| pos, saved = print_and_save(bc, pos, flight_conditional_repeated_header_fields, indent=' ') | |
| rssize = saved[17] | |
| if rssize: | |
| pos, _ = print_and_save(bc, pos, flight_conditional_repeated_body_fields, stop=pos+rssize, indent=' ') | |
| print " Conditional coda:" | |
| pos, _ = print_and_save(bc, pos, flight_conditional_coda_fields, stop=endpos, indent=' ') | |
| if pos < len(bc): | |
| print " Security:" | |
| pos, saved = print_and_save(bc, pos, security_header_fields, indent=' ') | |
| sdsize = saved[29] | |
| if sdsize: | |
| pos, _ = print_and_save(bc, pos, security_coda_fields, stop=pos+sdsize, indent=' ') | |
| if pos < len(bc): | |
| print "Leftover bytes at end: %s" % repr(bc[pos : ]) |
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