[File] jpeg detection regression

[Christos Zoulas]

Fixed, thanks

christos

> On Aug 26, 2021, at 8:09 PM, Christoph Biedl <astron.com.bwoj at manchmal.in-ulm.de> wrote:
> 
> Hello,
> 
> Hello,
> 
> commit FILE5_40-25-g750e69ca
> 
>    750e69ca3716a1d273ea2b5f5f40620c5c41d0c2
>    Author: Christos Zoulas <christos at zoulas.com>
>    Date:   Mon Apr 19 18:58:30 2021 +0000
> 
>        Regognize jpeg-ls and make the magic for jpeg stronger so that it does not
>        need extra strength boost
> 
> unfortunatly introduced a regression, one file in my collection is now
> detected as
> 
> | DOS/MBR boot sector; partition 1 : ID=0xb3, active 0xb0, start-CHS (0x2b3,204,11), end-CHS (0x148,243,45), startsector 943011019, 1208593131 sectors; partition 3 : ID=0xd7, active 0xdc, start-CHS (0x75,139,10), end-CHS (0x120,3,45), startsector 2186963805, 1290699090 sectors
> 
> instead of (correctly)
> 
> | JPEG image data, JFIF standard 1.01, resolution (DPI), density 96x96, segment length 16, baseline, precision 8, 407x374, components 3\012- data
> 
> 
> Problem is (if I read the dumps correctly) the strength of the new magic
> is rather poor:
> 
> 150 old strength
> 131 DOS/MBR strength
> 70  new strength
> 
> So indeed adding a strenght of 62 restores the desired detection. But
> perhaps there is a better way to fix this.
> 
> Sample file:
> 
> md5: e46cdc3a85e8da2b0e61f55d7247276f
> sha256: ddbdc5539ef1f279d848a3761eb9d99e819bd61fae48f60e7c42f6ee0932c863
> 
> Local file name is "4972961.bin.jpeg" - possibly it was part of the
> report 421 in the old bugtracker, so you might have a copy of it.
> 
>    Christoph
> --
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