LibTiff Mailing List
TIFF and LibTiff Mailing List Archive
May 2005
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
2005.05.31 23:56 "Re: hot to detect corrupt tif file", by Andy Cave
Hi Gordon. Two things that 'work': 1. Do a basic open on the tiff file. If that succeeds, you've got a good chance it's a tiff file. 2. Read the band/tile offsets & sizes, and check that 'they make sense' - that is that each band/tile offsets & offset+size lies within the physical size of the file (assuming it's a file). If the file is corrupt, there is a good chance that this will fail. After that, the only thing you can do to check there is no corruption, is to read each band/tile (and decompress it et al). But that's a lot of overhead. So, I'd suggest the first 2. We do that with our product FirstPROOF, and it seems to be a reasonable catch of corrupt files. Andy. Andy Cave, Chief Executive Officer, Hamillroad Software Limited. www.firstproof.com www.hamillroad.com