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July 2007
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2007.07.02 18:49 "Re: Old corrupted TIFF data - "Can not read directory count"", by Steve Bougerolle
2007.07.02 19:06 "Re: Old corrupted TIFF data - "Can not read directory count"", by Steve Bougerolle
2007.07.03 17:06 "Re: Old corrupted TIFF data - "Can not read directory count"", by Steve Bougerolle
2007.07.03 18:11 "Re: Old corrupted TIFF data - "Can not read directory count"", by Steve Bougerolle2007.07.02 18:00 "Old corrupted TIFF data - "Can not read directory count"", by Steve Bougerolle
Hi all
I've got a bunch of TIFF files created back in 1998, which I find I
can't read any more. The error from libtiff is "Can not read directory
count" and I haven't been able to rebuild whatever old library these
were made with, so now I'm looking at the file format trying to work out
what went wrong. If any of you can help me along that'd be much
appreciated!
I've attached the first few rows of a hex dump at the bottom of this
email. Here's what I've puzzled out about the data so far:
49 49 2A 00 - The usual first four bytes
5A B3 00 01 - Should be the directory offset? Can't be valid, though,
because it points past the end of the file. I haven't
been able to figure out what else this might identify.
Date string - the last byte is zero so I assume it's written out with
null termination. This is the date the image was created,
as best I remember.
60 09 00 00 - no idea what all this is
01 00 00 00
60 09 00 00
01 00 00 00
08 00 08 00
(then it trails off into less regular stuff)
Does this form suggest anything to anybody? I think these files were
created on Linux using libtiff (around version 3.5.5) but I'm not sure
of it. They might also have come from PaintShopPro as I was still using
that for some work back then.
The actual hex dump, first 64 bytes:
49 49 2a 00 5a b3 00 01 31 39 39 38 3a 31 32 3a |II*.Z...1998:12:|
31 38 20 30 36 3a 32 35 3a 35 36 00 60 09 00 00 |18 06:25:56.`...|
01 00 00 00 60 09 00 00 01 00 00 00 08 00 08 00 |....`...........|
08 00 ba 08 00 00 72 d1 00 00 af 97 01 00 c5 62 |......r........b|
Thanks for any help!
--
Steve Bougerolle <steveb@sebgitech.com>
http://www.sebgitech.com
http://www.bougerolle.net