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#------------------------------------------------------------------------------
# $File: mmdf,v 1.7 2024/02/29 03:40:37 christos Exp $
# mmdf: file(1) magic for MMDF mail files
# Update: Joerg Jenderek Feb 2024
# URL: https://en.wikipedia.org/wiki/MMDF
# Reference: https://docs.oracle.com/cd/E88353_01/html/E37852/mmdf-5.html
# Note: Multi-channel Memorandum Distribution Facility (MMDF) mailbox format is a legacy variant of mbox format
# (handled by ./mail.news); each message is surrounded by lines containing 4 control-A
#
0 string \001\001\001\001
# GRR: MMDF mailbox (strength=70=70+0 ./mmdf) after D64 Image (strength=70=70+0 ./c64) Targa image data (strength=70=110-40 ./images)
# and before "PDP-11 UNIX/RT ldp" (strength=50=50+0 ./pdp)
#!:strength +0
# skip few Commodore disc Image where first content are initialized with ^A like "The Great Gianna Sisters.d64"
# by looking for following valid line terminator (10=0Ah~LineFeed or 13=0Dh~CarriageReturn)
#>4 ubyte&0xF8 =0x08 MMDF mailbox
# or by looking for MBOX Mailbox (/mail.news) characteristic like:
# https://github.com/dfandrich/oldmailconvert/blob/master/testdata/uupc.input.1
>5 search/610/b From\ MMDF mailbox
#!:mime application/octet-stream
!:mime message/x-mmdf
# https://github.com/dfandrich/oldmailconvert/blob/master/testdata/maillog.expected.2
# but default mailbox name is like /usr/spool/mail/username
!:ext /mmdf
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