[File] [PATCH] Magdir/riff Microsoft Flight Simulator *.MDL described only generic

[Christos Zoulas]

Committed, thanks!

christos

> On Aug 6, 2023, at 2:35 PM, Jörg Jenderek (GMX) <joerg.jen.der.ek at gmx.net> wrote:
> 
> Hello,
> some weeks ago i handled some RIFF based video files. When i run
> file command version 5.45 on more RIFF based samples with MDL file name
> suffix i get an output like:
> 
> XL5.mdl: RIFF (little-endian) data
> tb1.mdl: RIFF (little-endian) data
> 
> With --extension option only ??? is displayed for MDL samples.
> Furthermore with option -i for inspected MDL samples only generic
> application/octet-stream is shown.
> 
> For comparison reason i also run the file format identification
> utility DROID ( See https://sourceforge.net/projects/droid/). This
> does not recognize the the MDL examples.
> 
> For comparison reason i run the file format identification utility
> TrID ( See https://mark0.net/soft-trid-e.html). This identifies also
> all my MDL examples with low priority as "Generic RIFF container" by
> riff.trid.xml. The examples are described with high rate as "Microsoft
> Flight Simulator 3D model (generic)" by mdl-fs-gen.trid.xml (See
> appended trid-v-mdl.txt.gz).
> This tool list the used file name extension and with -v option the
> related URL pointing to used software company. Luckily with shown
> information i found page about "MDL file format". That informations are
> expressed by comment lines inside Magdir/riff like:
> # URL:	https://en.wikipedia.org/wiki/Microsoft_Flight_Simulator
> # Ref.:	https://www.fsdeveloper.com/wiki/index.php
> #	?title=MDL_file_format_(FSX)
> #	http://mark0.net/download/triddefs_xml.7z
> #	defs/m/mdl-fs-gen.trid.xml
> 
> All detected MDL samples are at least general described by Magdir/riff
> with line like:
> 0	string		RIFF		RIFF (little-endian) data
> 
> For other RIFF samples the sub classification is done by considering 4
> byte string at offset 8. According to references this is 3 byte MDL
> string. So this is now done by additional lines inside Magdir/riff like:
>  >8	string		MDL
>  >>12	string		MDLH	\b, Microsoft Flight Simulator 3D model
>  !:mime	application/x-ms-mdl
>  !:ext	mdl
> 
> Instead of generic mime type application/octet-stream or
> application/x-riff i show an user defined one.
> 
> After applying the above mentioned modifications by patch
> file-5.45-riff-mdl.diff then all my inspected Microsoft Flight Simulator
>  examples are now described with more details. This now looks like:
> 
> XL5.mdl: RIFF (little-endian) data, Microsoft Flight Simulator 3D model
> tb1.mdl: RIFF (little-endian) data, Microsoft Flight Simulator 3D model
> 
> I hope my diff file can be applied in future version of file
> utility.
> 
> Unfortunately the MDL file name suffix is also used for other file formats.
> 
> With best wishes,
> Jörg Jenderek
> --
> Jörg Jenderek
> <trid-v-mdl.txt.gz><file-5_45-riff-mdl_diff.DEFANGED-0><file-5_45-riff-mdl_diff_sig.DEFANGED-1>--
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