file/magic/Magdir/xenix

#------------------------------------------------------------------------------
# $File: xenix,v 1.15 2022/10/19 20:15:16 christos Exp $
# xenix:  file(1) magic for Microsoft Xenix
#
# "Middle model" stuff, and "Xenix 8086 relocatable or 80286 small
# model" lifted from "magic.xenix", with comment "derived empirically;
# treat as folklore until proven"
#
# "small model", "large model", "huge model" stuff lifted from XXX
#
# XXX - "x.out" collides with PDP-11 archives
#
0	string		core		core file (Xenix)
# URL: http://www.polarhome.com/service/man/?qf=86rel&tf=2&of=Xenix
#      http://fileformats.archiveteam.org/wiki/OMF
# Reference: http://www.azillionmonkeys.com/qed/Omfg.pdf
# Update: Joerg Jenderek
# recordtype~TranslatorHEADerRecord
0	byte		0x80
# GRR: line above is too general as it catches also Extensible storage engine DataBase,
# all lif files like forth.lif hpcc88.lif lex90b.lif ( See ./lif)
# and all compressed DEGAS low-res bitmaps like: MUNCHIE.PC1 PIDER1.PC1
# skip examples like GENA.SND Switch.Snd by looking for record length maximal 1024-3
>1	uleshort	<1022
# skip examples like GAME.PICTURE Strange.Pic by looking for positive record length
>>1	uleshort	>0
# skip examples like Xtable.Data FRACTAL.GEN SHR.VIEW by looking for positive string length
>>>3	ubyte		>0
# skip examples like OMBRE.6 with "UUUUUU" name by looking for valid high second record type
>>>>(1.s+3)	ubyte	>0x6D
# skip few Atari DEGAS bitmap TPDEMO.PC2 RECIPE.PC2 with invalid "high" second record type FEh FFh
>>>>>(1.s+3)	ubyte	<0xF2	8086 relocatable (Microsoft)
#!:mime	application/octet-stream
!:mime	application/x-object
!:ext	obj/o/a
# T-module name often source name like "hello.c" or "jmppm32.asm" in JMPPM32.OBJ or
# "kbhit" in KBHITS.OBJ or "CAUSEWAY_KERNAL" in CWAPI.OBJ
>>>>>>3	pstring		x		\b, "%s"
# data length probably lower 256 according to TrID obj_omf.trid.xml
>>>>>>1	uleshort	x		\b, 1st record data length %u
# checksum
#>>>>>>(3.b+4)	ubyte	x		\b, checksum %#2.2x
# second recordtype: 96h~LNAMES 88h~COMENT 8CH~EXTDEF
# highest F1h~Library End Record
>>>>>>(1.s+3)	ubyte	x		\b, 2nd record type %#x
>>>>>>(1.s+4)	uleshort x		\b, 2nd record data length %u
0	leshort		0xff65		x.out
>2	string		__.SYMDEF	 randomized
>0	byte		x		archive
0	leshort		0x206		Microsoft a.out
>8	leshort		1		Middle model
>0x1e	leshort		&0x10		overlay
>0x1e	leshort		&0x2		separate
>0x1e	leshort		&0x4		pure
>0x1e	leshort		&0x800		segmented
>0x1e	leshort		&0x400		standalone
>0x1e	leshort		&0x8		fixed-stack
>0x1c	byte		&0x80		byte-swapped
>0x1c	byte		&0x40		word-swapped
>0x10	lelong		>0		not-stripped
>0x1e	leshort		^0xc000		pre-SysV
>0x1e	leshort		&0x4000		V2.3
>0x1e	leshort		&0x8000		V3.0
>0x1c	byte		&0x4		86
>0x1c	byte		&0xb		186
>0x1c	byte		&0x9		286
>0x1c	byte		&0xa		386
>0x1f	byte		<0x040		small model
>0x1f	byte		=0x048		large model
>0x1f	byte		=0x049		huge model
>0x1e	leshort		&0x1		executable
>0x1e	leshort		^0x1		object file
>0x1e	leshort		&0x40		Large Text
>0x1e	leshort		&0x20		Large Data
>0x1e	leshort		&0x120		Huge Objects Enabled
>0x10	lelong		>0		not stripped

0	leshort		0x140		old Microsoft 8086 x.out
>0x3	byte		&0x4		separate
>0x3	byte		&0x2		pure
>0	byte		&0x1		executable
>0	byte		^0x1		relocatable
>0x14	lelong		>0		not stripped

0	lelong		0x206		b.out
>0x1e	leshort		&0x10		overlay
>0x1e	leshort		&0x2		separate
>0x1e	leshort		&0x4		pure
>0x1e	leshort		&0x800		segmented
>0x1e	leshort		&0x400		standalone
>0x1e	leshort		&0x1		executable
>0x1e	leshort		^0x1		object file
>0x1e	leshort		&0x4000		V2.3
>0x1e	leshort		&0x8000		V3.0
>0x1c	byte		&0x4		86
>0x1c	byte		&0xb		186
>0x1c	byte		&0x9		286
>0x1c	byte		&0x29		286
>0x1c	byte		&0xa		386
>0x1e	leshort		&0x4		Large Text
>0x1e	leshort		&0x2		Large Data
>0x1e	leshort		&0x102		Huge Objects Enabled

0	leshort		0x580		XENIX 8086 relocatable or 80286 small model
# GRR: line above is too general as it catches also all 8086 relocatable (Microsoft) with 1st record data length 5 C0M.OBJ C0T.OBJ C0S.OBJ