[File] PRONOM signature conversions

[Christos Zoulas]

> On Apr 12, 2025, at 8:55 AM, Jason Summers <jason1 at pobox.com> wrote:
> 
> I don't speak for the 'file' project maintainers.
> 
> Looks like a lot of good information here. But I feel like I must be missing something. Does the file on GitHub only include the first *line* of each pattern?
> 
> Consider these examples. (Note that these are the complete patterns. There are no ">" lines.)
> 
> 0   string  \x46\x4f\x52\x4d    Amiga Metafile Format
> 0   string  \x46\x4f\x52\x4d    Extended MIDI Audio File
> 0   string  \x46\x4f\x52\x4d    FAXX IFF Facsimile Image
> 0   string  \x46\x4f\x52\x4d    IFF Amiga Contiguous BitMap
> 
> These are obviously not usable as they are.
> 
> Are your PRONOM patterns more strict than this? I know that not every PRONOM pattern can easily be converted to file's format. But if a pattern can't be converted properly, I'd think it should be rejected, not converted badly.
> 

Plus 
> 0   string  \x46\x4f\x52\x4d    Amiga Metafile Format
> 
is just:
0	string FORM	Amiga Metafile format

which is already there:

$ grep FORM iff
iff:0   string          FORM            IFF data

christos
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