LibTiff Mailing List
TIFF and LibTiff Mailing List Archive
July 2007
Previous Thread
Next Thread
Previous by Thread
Next by Thread
Previous by Date
Next by Date
Contact
The TIFF Mailing List Homepage
This list is run by Frank Warmerdam
Archive maintained by AWare Systems
Thread
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 18:40 "Re: Old corrupted TIFF data - "Can not read directory count"", by Kevin Myers
Hi Steve, What is your file size on disk? Are you reading the bytes backwards? The 4 bytes that you gave below only indicate a 16 MB offset (Intel hex 01 00 b3 5a), so that could easily be realistic... HTH, Kevin M. ----- Original Message ----- From: "Steve Bougerolle" <steveb@sebgitech.com> To: <tiff@lists.maptools.org> Sent: Monday, July 02, 2007 13:00 Subject: [Tiff] Old corrupted TIFF data - "Can not read directory count" > > 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 > _______________________________________________ > Tiff mailing list: Tiff@lists.maptools.org > http://lists.maptools.org/mailman/listinfo/tiff > http://www.remotesensing.org/libtiff/ > >