[File] [PATCH] of Magdir/archive for FTCOMP compressed

[Christos Zoulas]

Committed, thanks!

christos

> On Apr 8, 2021, at 7:41 PM, Jörg Jenderek <joerg.jen.der.ek at gmx.net> wrote:
> 
> Hello,
> some days ago i handled some OS/2 disks. There i found some files
> with DLL and DRV file name extension. These are typical used for
> dynamic linked libraries and device drivers. But when in run file
> command version 5.40 on such OS/2 files and related examples i get an
> output like:
> 
> 8514.DRV:     data
> EGAMONO.DRV:  data
> install.in_:  data
> KBDFR.DLL:    data
> KBDPO.DLL:    data
> KBDUS.DLL:    data
> LANGDUT.DLL:  data
> LANGENG.DLL:  data
> LANGFRN.DLL:  data
> LANGPOL.DLL:  data
> MAHJONGG.EX@: data
> MAHJONGG.HL@: data
> MAHTILE7.TI@: data
> MAHTILE@:     data
> os2drv.pk2:   data
> PMSPL20.DLL:  data
> seahaven.ex_: data
> seahaven.hl_: data
> UNPACK:       data
> UNPACK.EXE:   MS-DOS executable, NE for OS/2 1.x (EXE)
> 
> Some are not recognised. For comparison reason i run the file format
> identification utility TrID ( See
> https://mark0.net/soft-trid-e.html). This describes the "data"
> examples as "FTCOMP compressed archive" by definition
> ark-ftcomp.trid.xml (See appended ftcomp-trid-v.txt.gz)
> 
> On file formats archive team web site exist a page about FTCOMP. This
> is now expressed inside Magdir/archive by additional comment lines like
> # URL:		http://fileformats.archiveteam.org/wiki/FTCOMP
> # Reference: http://mark0.net/download/triddefs_xml.7z/
> # defs/a/ark-ftcomp.trid.xml
> 
> This is neither an official nor a complete documentation. According
> to that site such samples start with 4 byte sequence A596FDFF, but
> according to TrID the 6 byte string FTCOMP" always appear at same
> offset 41. So i choose this as test line, which looks like
> 24	string/b	FTCOMP		FTCOMP compressed archive
> !:mime	application/x-compress-ftcomp
> 
> Instead of generic mime type application/octet-stream i show an user
> defined one.
> Some bytes after the FTCOMP string i saw another string which is
> apparently the original file name with directory ( like
> \OS2\unpack.exe \SYSTEM\8514.DRV MAHJONGG.EXE). So show this
> information by line like:
> >41	string		x		"%s"
> 
> Apparently the archive name is generated by taking the last character
> of the original file name extension and replace it with a underscore
> ("_" like in seahaven.hl_ from seahaven.hlp) or at character ("@"
> like in MAHJONGG.EX@ from MAHJONGG.EXE). These extensions are
> mentioned on web site. This behaviour also appears for MS Compress
> archive. So i put my lines afterwards in Magdir/archive.
> But i also found FTCOMP compressed examples without file name
> extension ( like MAHTILE@ or UNPACK) or with PK2 extension like in
> os2drv.pk2 where archive names have no such strong relation to
> original file name.
> And i also found examples where archive name is like the original
> library or driver name like in examples KBDFR.DLL or 8514.DRV.
> That is obviously irritating for users. So all these file name
> extensions are shown by line like:
> !:ext	??_/??@/dll/drv/pk2/
> 
> After applying the above mentioned modifications by patch
> file-5.40-archive-ftcomp.diff then such compressed files are
> are now described like:
> 
> 8514.DRV:     FTCOMP compressed archive "\SYSTEM\8514.DRV"
> EGAMONO.DRV:  FTCOMP compressed archive "\SYSTEM\EGAMONO.DRV"
> install.in_:  FTCOMP compressed archive "EPFinsts.exe"
> KBDFR.DLL:    FTCOMP compressed archive "\SYSTEM\KBDFR.DLL"
> KBDPO.DLL:    FTCOMP compressed archive "\SYSTEM\KBDPO.DLL"
> KBDUS.DLL:    FTCOMP compressed archive "\SYSTEM\KBDUS.DLL"
> LANGDUT.DLL:  FTCOMP compressed archive "\SYSTEM\LANGDUT.DLL"
> LANGENG.DLL:  FTCOMP compressed archive "\SYSTEM\LANGENG.DLL"
> LANGFRN.DLL:  FTCOMP compressed archive "\SYSTEM\LANGFRN.DLL"
> LANGPOL.DLL:  FTCOMP compressed archive "\SYSTEM\LANGPOL.DLL"
> MAHJONGG.EX@: FTCOMP compressed archive "MAHJONGG.EXE"
> MAHJONGG.HL@: FTCOMP compressed archive "MAHJONGG.HLP"
> MAHTILE7.TI@: FTCOMP compressed archive "MAHTILE7.til"
> MAHTILE@:     FTCOMP compressed archive "12.ICO"
> os2drv.pk2:   FTCOMP compressed archive "\os2\dll\bvhsvga.dll"
> PMSPL20.DLL:  FTCOMP compressed archive "\SYSTEM\PMSPL20.DLL"
> seahaven.ex_: FTCOMP compressed archive "seahaven.exe"
> seahaven.hl_: FTCOMP compressed archive "seahaven.HLP"
> UNPACK:       FTCOMP compressed archive "\OS2\unpack.exe"
> UNPACK.EXE:   MS-DOS executable, NE for OS/2 1.x (EXE)
> 
> I hope my diff file can be applied in future version of
> file utility.
> 
> With best wishes
> Jörg Jenderek
> --
> Jörg Jenderek
> 
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> <ftcomp-trid-v.txt.gz><file-5_40-archive-ftcomp_diff.DEFANGED-0><file-5_40-archive-ftcomp_diff_sig.DEFANGED-1>--
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