App crashes when encountering RDATE #284
Description
I've noticed that specific calendar events that contain the RDATE field crash the etesync Android app.
Steps to reproduce
- Create a new calendar collection and import the example ics file below (I did so through the web interface)
- Press the sync button on the Android app
- Observer the crash
Example ICS file:
BEGIN:VCALENDAR
PRODID:-//Mozilla.org/NONSGML Mozilla Calendar V1.1//EN
VERSION:2.0
NAME:Mein Kalender
X-WR-CALNAME:Mein Kalender
BEGIN:VTIMEZONE
TZID:Europe/Vienna
X-TZINFO:Europe/Vienna[2025b]
BEGIN:STANDARD
TZOFFSETTO:+010000
TZOFFSETFROM:+010521
TZNAME:Europe/Vienna(STD)
DTSTART:18930401T000000
RDATE:18930401T000000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETTO:+020000
TZOFFSETFROM:+010000
TZNAME:Europe/Vienna(DST)
DTSTART:19160430T230000
RDATE:19160430T230000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETTO:+010000
TZOFFSETFROM:+020000
TZNAME:Europe/Vienna(STD)
DTSTART:19161001T010000
RDATE:19161001T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETTO:+020000
TZOFFSETFROM:+010000
TZNAME:Europe/Vienna(DST)
DTSTART:19170416T020000
RRULE:FREQ=YEARLY;BYMONTH=4;BYDAY=3MO;UNTIL=19180415T020000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETTO:+010000
TZOFFSETFROM:+020000
TZNAME:Europe/Vienna(STD)
DTSTART:19170917T030000
RRULE:FREQ=YEARLY;BYMONTH=9;BYDAY=3MO;UNTIL=19180916T030000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETTO:+020000
TZOFFSETFROM:+010000
TZNAME:Europe/Vienna(DST)
DTSTART:19200405T020000
RDATE:19200405T020000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETTO:+010000
TZOFFSETFROM:+020000
TZNAME:Europe/Vienna(STD)
DTSTART:19200913T030000
RDATE:19200913T030000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETTO:+020000
TZOFFSETFROM:+010000
TZNAME:Europe/Vienna(DST)
DTSTART:19400401T020000
RDATE:19400401T020000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETTO:+010000
TZOFFSETFROM:+020000
TZNAME:Europe/Vienna(STD)
DTSTART:19421102T030000
RDATE:19421102T030000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETTO:+020000
TZOFFSETFROM:+010000
TZNAME:Europe/Vienna(DST)
DTSTART:19430329T020000
RDATE:19430329T020000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETTO:+010000
TZOFFSETFROM:+020000
TZNAME:Europe/Vienna(STD)
DTSTART:19431004T030000
RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=1MO;UNTIL=19441002T030000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETTO:+020000
TZOFFSETFROM:+010000
TZNAME:Europe/Vienna(DST)
DTSTART:19440403T020000
RRULE:FREQ=YEARLY;BYMONTH=4;BYDAY=1MO;UNTIL=19450402T020000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETTO:+010000
TZOFFSETFROM:+020000
TZNAME:Europe/Vienna(STD)
DTSTART:19450412T030000
RDATE:19450412T030000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETTO:+020000
TZOFFSETFROM:+010000
TZNAME:Europe/Vienna(DST)
DTSTART:19460414T020000
RDATE:19460414T020000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETTO:+010000
TZOFFSETFROM:+020000
TZNAME:Europe/Vienna(STD)
DTSTART:19461007T030000
RDATE:19461007T030000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETTO:+020000
TZOFFSETFROM:+010000
TZNAME:Europe/Vienna(DST)
DTSTART:19470406T020000
RDATE:19470406T020000
END:DAYLIGHT
BEGIN:DAYLIGHT
TZOFFSETTO:+020000
TZOFFSETFROM:+010000
TZNAME:Europe/Vienna(DST)
DTSTART:19480418T020000
RDATE:19480418T020000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETTO:+010000
TZOFFSETFROM:+020000
TZNAME:Europe/Vienna(STD)
DTSTART:19471005T030000
RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=1SU;UNTIL=19481003T030000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETTO:+020000
TZOFFSETFROM:+010000
TZNAME:Europe/Vienna(DST)
DTSTART:19800406T000000
RDATE:19800406T000000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETTO:+010000
TZOFFSETFROM:+020000
TZNAME:Europe/Vienna(STD)
DTSTART:19800928T000000
RDATE:19800928T000000
END:STANDARD
BEGIN:STANDARD
TZOFFSETTO:+010000
TZOFFSETFROM:+020000
TZNAME:Europe/Vienna(STD)
DTSTART:19810927T030000
RRULE:FREQ=YEARLY;BYMONTH=9;BYDAY=-1SU;UNTIL=19950924T030000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETTO:+020000
TZOFFSETFROM:+010000
TZNAME:Europe/Vienna(DST)
DTSTART:19810329T020000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU;UNTIL=19960331T020000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETTO:+010000
TZOFFSETFROM:+020000
TZNAME:Europe/Vienna(STD)
DTSTART:19961027T030000
RDATE:19961027T030000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETTO:+020000
TZOFFSETFROM:+010000
TZNAME:(DST)
DTSTART:19970330T020000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETTO:+010000
TZOFFSETFROM:+020000
TZNAME:(STD)
DTSTART:19971026T030000
RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
CREATED:20251126T105941Z
LAST-MODIFIED:20251213T121641Z
DTSTAMP:20251213T121641Z
UID:123456
RDATE;TZID=Europe/Vienna:20250505T180000
DTSTART;TZID=Europe/Vienna:20250505T180000
DTEND;TZID=Europe/Vienna:20250505T180000
SUMMARY:Crash
X-MOZ-FAKED-MASTER:1
END:VEVENT
BEGIN:VEVENT
CREATED:20251213T121641Z
LAST-MODIFIED:20251213T121641Z
DTSTAMP:20251213T121641Z
UID:123456
SUMMARY:Crash
STATUS:CONFIRMED
RECURRENCE-ID;TZID=Europe/Vienna:20250505T180000
DTSTART;TZID=Europe/Vienna:20250505T180000
DTEND;TZID=Europe/Vienna:20250505T200000
SEQUENCE:2
END:VEVENT
END:VCALENDAR