[File] [PATCH] Magdir/frame FrameMaker Book; mime type and extension

[Christos Zoulas]

Committed, thanks!

christos

> On Dec 9, 2023, at 5:24 PM, Jörg Jenderek (GMX) <joerg.jen.der.ek at gmx.net> wrote:
> 
> Hello,
> 
> some days ago i must handles some old software samples from Adobe
> Framemaker. One file sort are Book documents.
> 
> So i look for more of such files. When running file command
> version 5.45 on such samples i get an output like:
> 
> CLIPART.BK:      FrameMaker Book file Y)
> CRC.BK:          data
> CUSTM.BK:        FrameMaker Book file Y)
> FIELD.BK:        data
> RADIO.BK:        FrameMaker Book file Y)
> SampleBook.book: FrameMaker Book file 0)
> qrgfm.book:      data
> tut.book:        data
> 
> With option --extension only 3 byte sequence ??? is shown and with -i
> option application/x-mif is shown.
> 
> For comparison reason i run the file format identification utility
> TrID ( See https://mark0.net/soft-trid-e.html). Most of the samples
> recognized by file command are described here as "FrameMaker book" by
> book-fm.trid.xml without mime type and file name suffix BOOK. All of
> these samples are described with lower priority as "Maker Interchange
> Format Book" with mime type application/vnd.mif and suffix MIF by
> mif-book.trid.xml. SampleBook.book is described with highest priority as
> "Adobe Extensible Metadata Platform" with suffix XMP by xmp.trid.xml.
> This is also described with lowest priority as "HyperText Markup
> Language" with suffix HTML by html.trid.xml. Some examples ( like
> CLIPART.BK FIELD.B) not detected by file command are here described also
> as "Maker Interchange Format Book". With newest database now all samples
> are recognized and described as "FrameMaker book (binary)" with mime
> type application/vnd.framemaker and 2 suffix (.BK/BOOK) by
> bk-fm.trid.xml (See appended trid-v-book.txt.gz).
> 
> For comparison reason i also run the file format identification
> utility DROID ( See https://sourceforge.net/projects/droid/). This
> identifies no examples.
> 
> On Linux according to shared MIME-info database such samples are called
> "Adobe FrameMaker document". Here also application/vnd.framemaker is
> used as mime type and file name suffix fm is shown. The samples are here
> just recognized by looking for 5 byte sequence <Book at the beginning.
> That information can be seen in source freedesktop.org.xml.in found for
> example on gitlab.freedesktop.org.
> 
> That informations are now expressed by comment line inside Magdir/frame
> like:
> # URL:		http://fileformats.archiveteam.org/wiki/FrameMaker
> # Reference:	http://mark0.net/download/triddefs_xml.7z
> #		defs/b/bk-fm.trid.xml
> # 		defs/b/book-fm.trid.xml
> 
> The description happens by lines inside Magdir/frame like:
> 0	string		\<BookFile	FrameMaker Book file
> !:mime	application/x-mif
> >10	string		3.0		 (3.0
> >10	string		2.0		 (2.0
> >10	string		1.0		 (1.0
> >13	byte		x		  %c)
> 
> For control reason you can look at the first line of the samples by
> command like:
> 	head -1 *.bk *.book
> 
> So we see (appended head-1.txt.gz) that for the correct described
> samples (like CLIPART.BK RADIO.BK) at offset 1 BookFile is stored. For
> samples described only as MIF (like CRC.BK FIELD.BK) at offset 1
> Bookfile (just capitalised) is stored.
> For samples described as unknown (like qrgfm.book tut.book) at offset 1
> BOOKFILE (up-cased variant) is stored.
> All description happens because at the beginning less sign is stored. So
> one sample SampleBook.book is described as HTML by TrID.
> First i get only 2 samples, So i thought these are accidents but in the
> end i get 8 samples.
> 
> Apparently at offset 10 version string (like 3.0F 4.0K 5.0Y 10.0) is
> stored. The file command does not detect these versions because it
> checks only for 3 versions (1.0 2.0 3.0). Older TrID checks for major
> version digit followed by point character and minor version digit 0.
> So SampleBook.book with version 10.0 was missed.
> 
> So this now becomes like:
> 0	string/c	\<Bookfile	FrameMaker Book file
> !:mime	application/vnd.framemaker
> !:ext	bk/book
> >10	string		x		(%-0.3s
> >13	ubyte		=0x3e		\b)
> >13	ubyte		<0x3A		\b%c)
> >13	ubyte		>0x3A		%c)
> For most cases we got 3 byte version string, which is terminated by
> greater sign. If forth character is digit than assume and print as 4
> byte version string. If forth character is a letter than assume and
> print as 3 byte version string with append sub level.
> 
> After applying the above mentioned modifications by patch
> file-5.45-frame-book.diff then now all my inspected samples are
> described and now also correct version information is shown. This now
> looks like:
> 
> CLIPART.BK:      FrameMaker Book file (5.0 Y)
> CRC.BK:          FrameMaker Book file (3.0 F)
> CUSTM.BK:        FrameMaker Book file (5.0 Y)
> FIELD.BK:        FrameMaker Book file (3.0 F)
> RADIO.BK:        FrameMaker Book file (5.0 Y)
> SampleBook.book: FrameMaker Book file (10.0)
> qrgfm.book:      FrameMaker Book file (4.0 K)
> tut.book:        FrameMaker Book file (4.0 K)
> 
> I hope my diff file can be applied in future version of file
> utility.
> 
> With best wishes,
> Jörg Jenderek
> --
> Jörg Jenderek
> <trid-v-book.txt.gz><head-1.txt.gz><file-5_45-frame-book_diff.DEFANGED-9169><file-5_45-frame-book_diff_sig.DEFANGED-9170>-- 
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