extract_charts.py

#!/usr/bin/env python

import fileinput

def shipout(aerodrome, count, pdfstring):
    file = open(aerodrome + '_' + str(count) + '.pdf', 'w')
    file.write(pdfstring)

count = 0
aerodrome = ''
pdfstring = ''
tempstring = ''
for line in fileinput.input():
    index = line.find('%PDF-1.')
    if index != -1:
        if count > 0:
            print(aerodrome + ' ' + str(count) + ' end settled.\n')
            shipout(aerodrome, count, pdfstring)
            pdfstring = ''
        if not line[2:index] == aerodrome:
             count = 0
        count += 1
        aerodrome = line[2:index]
        pdfstring = line[index:]
        tempstring = ''
        print(aerodrome + ' ' + str(count) + ' begin detected.')
    else:
        if line.find('%%EOF') >= 0:
            tempstring += line
            pdfstring += tempstring
            tempstring = ''
            print('    Possible end of ' + aerodrome + ' ' + str(count) + ' detected')
        else:
            tempstring += line

print(aerodrome + ' ' + str(count) + ' end settled.\n')
shipout(aerodrome, count, pdfstring)