Add vCalendar (.vcs) and iCalendar (.ics) magic (Joerg Jenderek)

1 files changed, 63 insertions, 3 deletions

diff --git a/magic/Magdir/misctools b/magic/Magdir/misctools
index 4292e2b0..dc1542ad 100644
--- a/magic/Magdir/misctools
+++ b/magic/Magdir/misctools
@@ -1,11 +1,71 @@
 
 #-----------------------------------------------------------------------------
-# $File: misctools,v 1.20 2021/05/25 15:13:55 christos Exp $
+# $File: misctools,v 1.21 2023/02/03 20:43:48 christos Exp $
 # misctools:  file(1) magic for miscellaneous UNIX tools.
 #
 0	search/1	%%!!			X-Post-It-Note text
-0	string/c	BEGIN:VCALENDAR		vCalendar calendar file
-!:mime	text/calendar
+# URL:		http://fileformats.archiveteam.org/wiki/ICalendar
+#		https://en.wikipedia.org/wiki/ICalendar
+# Update:	Joerg Jenderek
+# Reference:	https://www.rfc-editor.org/rfc/rfc5545
+#		http://mark0.net/download/triddefs_xml.7z/defs/v/vcs.trid.xml
+# Note:		called "iCalendar - vCalendar" by TrID
+0	string/c			BEGIN:vcalendar
+# skip DROID fmt-387-signature-id-572.vcs fmt-388-signature-id-573.ics
+# with invalid separator 0x0 or 0xAB instead of CarriageReturn (0x0D) or LineFeed (0x0A)
+>15	ubyte&0xF8			=0x08
+# look for VERSION keyword often on second line but sometimes later as in holidays_NRW_2014.ics
+>>0	search/188			VERSION
+# after VERSION keword :1.0 or often :2.0 but sometimes also ;VALUE=TEXT:2.0 like in Jewish religious Juish.ics
+# http://www.webcal.guru/de-DE/kalender_herunterladen?calendar_instance_id=217
+# \n\040:2.0 like in import-real-world-2004-11-19.ics found at
+# https://ftp.gnu.org/gnu/emacs/emacs-28.1.tar.xz
+# emacs-28.1/test/lisp/calendar/icalendar-resources/import-real-world-2004-11-19.ics
+#>>>&0		string			x		AFTER_VERSION=%.15s
+# Note:		called "Internet Calendar and Scheduling format" by DROID via PUID fmt/388
+# skip optional verparam=;other-param like ;VALUE=TEXT and look for version 2.0 that implies iCalendar variant
+>>>&0		search/81		:2.0		iCalendar calendar
+# look for Free/Busy component
+>>>>15			search/278	:VFREEBUSY	file, with Free/Busy component
+!:mime							text/calendar
+!:apple							????iFBf
+# no real examples found but only example on Wikipedia page
+!:ext							ifb
+# iCalendar calendar without Free/Busy component
+>>>>15			default		x
+# look for ALARM component
+>>>>>15				search/154 	:VALARM	file, with ALARM component
+!:mime							text/calendar
+!:apple							????iCal
+# found on macOS beneath /Users/$USER/Library/Calendars/ as EventAllDayAlarms.icsalarm or EventTimedAlarms.icsalarm
+# no isc examples found
+!:ext							icsalarm/ics
+# iCalendar calendar without Free/Busy component and ALARM component
+>>>>>15				default		x	file
+!:mime							text/calendar
+!:apple							????iCal
+# no examples found with .ical .icalender suffix
+!:ext							ics
+# if no VERSION 2.0 is found then assume it is VERSION 1.0, that is older vCalendar
+# URL:		http://fileformats.archiveteam.org/wiki/VCalendar
+# Note:		called "VCalendar format" by DROID via fmt/387
+>>>&0		default			x		vCalendar calendar file
+# deprecated
+!:mime							text/x-vcalendar
+!:ext							vcs
+# GRR: without VERSION keyword violates specification but accepted by Thunderbird like
+# https://ftp.gnu.org/gnu/emacs/emacs-28.1.tar.xz
+# emacs-28.1/test/lisp/calendar/icalendar-resources/import-with-timezone.ics
+>>0	default				x		vCalendar calendar file, without VERSION
+!:mime							text/x-vcalendar
+#!:mime							text/calendar
+# no vcs example found
+!:ext							ics/vcs
+# GRR: According to newest specification CarriageReturn (0xD) and LineFeed (0xA) should be used as separator but others accepted by Thunderbird
+# like CRLF,LF in Sport Today.vcs created by calendar plugin of TV-Browser https://enwiki.tvbrowser.org/index.php/Calendar_Export
+# or LF like https://www.schulferien.org/media/ical/deutschland/ferien_nordrhein-westfalen_2023.ics?k=foo
+>>15	ubeshort			!0x0D0A		\b, without CRLF
+
 # updated by Joerg Jenderek at Apr 2015, May 2021
 # https://en.wikipedia.org/wiki/VCard
 # URL: 	http://fileformats.archiveteam.org/wiki/VCard