[okular] [Bug 436738] docdata duplicated each time pdf is edited

[Albert Astals Cid]

https://bugs.kde.org/show_bug.cgi?id=436738

--- Comment #18 from Albert Astals Cid <aacid at kde.org> ---
(In reply to pbs3141 from comment #17)
> > So I open a file, add an annotation, save it as filea.pdf then move the
> > annotation around and save it as fileb.pdf. Your algorithm would think it's
> > the same file.
> 
> Yes, except in the rare case that the annotation coordinates lie in a 4kB
> chunk. This indeterminacy alone is enough to make me not like my partial
> hashing scheme, unless it can be guaranteed that the annotation data will
> always be included.
> 
> Maybe the hash of the whole file is the way to go. Possibly falling back to
> partial hashing only for huge files.
> 
> By the way, if I add and save an annotation on a huge PDF file (> 1GB), does
> the whole PDF get rewritten out, or just the annotation?

Normal behaviour is append at the end.

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