
#------------------------------------------------------------------------------
# $File: modem,v 1.11 2022/10/19 20:15:16 christos Exp $
# modem:  file(1) magic for modem programs
#
# From: Florian La Roche <florian@knorke.saar.de>
1	string		PC\ Research,\ Inc	Digifax-G3-File
>29	byte		1			\b, fine resolution
>29	byte		0			\b, normal resolution

# Summary: CCITT Group 3 Facsimile in "raw" form (i.e. no header).
# Modified by: Joerg Jenderek
# URL: https://de.wikipedia.org/wiki/Fax
#	http://fileformats.archiveteam.org/wiki/CCITT_Group_3
# Reference: https://web.archive.org/web/20020628195336/http://www.netnam.vn/unescocourse/computervision/104.htm
# GRR: EOL of G3 is too general as it catches also TrueType fonts, Postscript PrinterFontMetric, others
0	short		0x0100
# 16 0-bits near beginning like True Type fonts *.ttf, Postscript PrinterFontMetric *.pfm, FTYPE.HYPERCARD, XFER
>2	search/9	\0\0
# maximal 7 0-bits for pixel sequences or 11 0-bits for EOL in G3
>2	default		x
# skip IRCAM file (VAX big-endian)	./audio
>>0	belong		!0x0001a364
# skip GEM Image data			./images
>>>2	beshort		!0x0008
# look for first keyword of Panorama database *.pan
>>>>11	search/262	\x06DESIGN
# skip Panorama database
>>>>11	default		x
# old Apple DreamWorld DreamGrafix *.3200 with keyword at end of g3 looking files
>>>>>27118	search/1864	DreamWorld
>>>>>27118	default		x
# skip MouseTrap/Mt.Defaults with file size 16 found on Golden Orchard Apple II CD Rom
>>>>>>8		ubequad		!0x2e01010454010203
# skip PICTUREH.SML found on Golden Orchard Apple II CD Rom
>>>>>>>8	ubequad		!0x5dee74ad1aa56394
# skip few (5/41) DEGAS mid-res bitmap (GEMINI01.PI2 GEMINI02.PI2 GEMINI03.PI2 CODE_RAM.PI2 TBX_DEMO.PI2)
# with file size 32034
>>>>>>>>-0	offset		!32034	raw G3 (Group 3) FAX, byte-padded
# version 5.25 labeled the entry above "raw G3 data, byte-padded"
!:mime	image/g3fax
#!:apple	????TIFF
!:ext	g3
# unusual image starting with black pixel
#0	short		0x1300		raw G3 (Group 3) FAX
0	short		0x1400
# 16 0-bits near beginning like PicturePuzzler found on Golden Orchard Apple CD Rom
>2	search/9	\0\0
# maximal 7 0-bits for pixel sequences or 11 0-bits for EOL in G3
>2	default		x
# skip some (84/1246) MacBinary II/III (Cyberdog2.068k.smi.bin FileMakerPro4.img.bin Hypercard1.25.image.bin UsbStorage1.3.5.smi.bin) with "non random" numbers by versions values 81h/82h + 81h
>>122	ubeshort&0xFcFf	!0x8081		raw G3 (Group 3) FAX
# version 5.25 labeled the above entry as "raw G3 data"
!:mime	image/g3fax
!:ext	g3
# unusual image with black pixel near beginning
#0	short		0x1900		raw G3 (Group 3) FAX

#
# Magic data for vgetty voice formats
# (Martin Seine & Marc Eberhard)

#
# raw modem data version 1
#
0    string    RMD1      raw modem data
>4   string    >\0       (%s /
>20  short     >0        compression type %#04x)

#
# portable voice format 1
#
0    string    PVF1\n         portable voice format
>5   string    >\0       (binary %s)

#
# portable voice format 2
#
0    string    PVF2\n         portable voice format
>5   string >\0          (ascii %s)

# From: Bernd Nuernberger <bernd.nuernberger@web.de>
# Brooktrout G3 fax data incl. 128 byte header
# Common suffixes: 3??, BRK, BRT, BTR
0	leshort		0x01bb
>2	leshort		0x0100		Brooktrout 301 fax image,
>>9	leshort		x		%d x
>>0x2d	leshort		x		%d
>>6	leshort		200		\b, fine resolution
>>6	leshort		100		\b, normal resolution
>>11	byte		1		\b, G3 compression
>>11	byte		2		\b, G32D compression
