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March 2000
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2000.03.21 14:57 "Re: Some CCITT Group 3 TIFFs crash libtiff", by Thad Humphries
> Jason Summers wrote:
>> >
>...
>I agree that they are not completely valid.
>
>(Aside: However, it's difficult to convince end users of this, since
>most image viewers display these files without even a warning, and the
>image appears correct to the naked eye.)
>
>I've been assuming that libtiff should not crash when it encounters an
>invalid file. Right?
I have found libtiff to be among the picker TIFF tools. For example, I
came across some TIFF files that called ColorMap of type LONG and had the
value wrong. It read (in MM format):
0140 0004 0300 0000 0009 57B7
when it should have read
0140 0003 0000 0300 0009 57B7
Now all the TIFF readers at my disposal read this file just fine *except*
libtiff, TIFFAnalyzer4.1 (on Macintosh, uses libtiff), and Imaging on WinNT
(does this use libtiff?). GraphicConvertor on the Macintosh and a Windows
application written with SnowBound's libraries read the file just fine.
Anyway, I had to modify tif_dirread.c to account for this bad tag.
--------------------------------------------------------------------------
Thad Humphries "Microsoft... What do you want
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