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2016.01.25 18:21 "[Tiff] checkit_tiff, fixit_tiff - question about memmapped I/O, and invitation for quality checks", by Romeyke, Andreas
2016.01.28 01:17 "Re: [Tiff] checkit_tiff, fixit_tiff - question about memmapped I/O, and invitation for quality checks", by Jürgen_Buchmüller

2016.01.25 18:21 "[Tiff] checkit_tiff, fixit_tiff - question about memmapped I/O, and invitation for quality checks", by Romeyke, Andreas

Dear libtiff-Developers,

Because we need some validation and repair tools for TIFFs by reasons of digital preservation, we developed

  • fixit_tiff to repair broken baseline TIFFs (see https://github.com/SLUB-digitalpreservation/fixit_tiff)
  • checkit_tiff to validate baseline TIFFs against fine granular rules (see https://github.com/SLUB-digitalpreservation/checkit_tiff)

To ensure that we does not have (a lot of) bugs included, we invite you to test both tools and verify stability of checkit_tiff against your TIFF collection.

Additional I have a question about the flag "rm"/"rM" of the TIFFOpen() function. I am right, that the "rM" uses memmapped I/O? But with my tests, it does not differ in speed with "rm"-mode. Could you explain, how it works in detail?

Thanks in advance.

Mit freundlichen Grüßen
With best regards,

Andreas Romeyke
--
team member "long-term preservation"

Saxon State- and University Library Dresden (SLUB)

Department 2 (IT), Division 2.3 (infrastructure and digital long-term preservation)

Zellescher Weg 18 | 01069 Dresden
phone: +49 351 4677 216
E-Mail: Andreas.Romeyke@slub-dresden.de
http://www.slub-dresden.de/ | @slubdresden