Re: C file recoginzed as image file

[Michaël Cadilhac]

Richard Stallman <address@hidden> writes:

>     http://www.w3.org/Graphics/GIF/spec-gif89a.txt tells me that the first
>     3 bytes contain the fixed value 'GIF', and the next 3 bytes contain
>     the version number:
>
> Can you find the list of actual valid version numbers?  I'd rather
> recognize those specific numberd, rather than any two-digit number
> whatsoever.

According to /usr/share/misc/file/magic, a GIF file is described as 

0       string          GIF8            GIF image data
>4      string          7a              \b, version 8%s,
>4      string          9a              \b, version 8%s,

So the regexp should be GIF8[79]a .

Actually, the two only versions of GIF are indeed 87a and 89a (named
after the year each format was created).

We probably should stick to the definitions of
/usr/share/misc/file/magic to create our magic variable.

-- 
 |      Michaël `Micha' Cadilhac     |  La culture c'est comme la confiture,  |
 |         Epita/LRDE Promo 2007     |      c'est meilleur avec du pain.      |
 |  http://michael.cadilhac.name     |           -- MOI59                     |
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