If by "page content" you mean the underlying content I'm making a PDF of, I
think I agree.
I'll mde5 the hashCode of those Java objects and make that the file ID.
Should work :)
Best,
Yuvi
--
Yuvi Masory
University of Pennsylvania
On Wed, Sep 29, 2010 at 12:54 PM, Leonard Rosenthol <[email protected]>wrote:
> Why not extract the page content and hash that?
>
>
>
> *From:* Yuvi Masory [mailto:[email protected]]
> *Sent:* Wednesday, September 29, 2010 12:05 PM
>
> *To:* iText Questions
> *Subject:* Re: [iText-questions] how to get zero diff on two consecutively
> created pdf files
>
>
>
> Well I hope you like tea because they're already out:
> http://yuvimasory.com/flashcards.html
>
> I want iText to behave this way because I have a script that rebuilds all
> my pdfs every night to benefit from the latest changes in my program.
> However, I *don't* want meaningless revisions to complicate my source tree
> in Git. So ideally, if the program has not changed, the pdfs that result
> will be identicai, and Git will not commit them.
>
>
>
> Anyway, does anyone have suggestions as to how to construct a reproducible
> unique ID for a file? Perhaps traversing the Document in some way as to make
> a string from its contents?
>
> Thanks again for the help.
>
> Best,
> Yuvi
>
> --
> Yuvi Masory
> University of Pennsylvania
>
> On Wed, Sep 29, 2010 at 7:45 AM, Leonard Rosenthol <[email protected]>
> wrote:
>
> Can you tell us what you are doing that you need iText to work this way?
>
>
>
> Because if you’re files show up in the real world with the matching IDs, I
> will get on the R3 downtown to the U of P for a “personal visit”….
>
>
>
> Leonard
>
>
>
> *From:* Yuvi Masory [mailto:[email protected]]
> *Sent:* Wednesday, September 29, 2010 7:38 AM
> *To:* iText Questions
>
>
> *Subject:* Re: [iText-questions] how to get zero diff on two consecutively
> created pdf files
>
>
>
> Thanks for the feedback everyone! Right now the patch meets my needs, but I
> may modify it to construct unique (reproducible) IDs when I have the chance.
>
> Best,
> Yuvi
>
> --
> Yuvi Masory
> University of Pennsylvania
>
> On Wed, Sep 29, 2010 at 7:01 AM, Leonard Rosenthol <[email protected]>
> wrote:
>
> As Michael said, the ID is indeed that - a UNIQUE identifier for the
> document and is indeed used in that way by various CMS/DMS systems to track
> the document.
>
> So if your code is being used in DEBUG mode for some sort of regression
> test - that's fine. But you can NOT put it into a production system.
>
> Leonard
>
>
> -----Original Message-----
> From: mkl [mailto:[email protected]]
> Sent: Wednesday, September 29, 2010 6:36 AM
> To: [email protected]
> Subject: Re: [iText-questions] how to get zero diff on two consecutively
> created pdf files
>
>
> Yuvi,
>
> Yuvi Masory wrote:
> > 3) The PDF's trailer includes a randomly generated String as its file ID
> -
> > solved by changing the appropriate method in PdfEncryption to always hash
> > the empty string.
>
> That could turn out against you eventually: As the trailer IDs are meant to
> be identifiers for documents and your patched code calculates the identical
> one for ANY document, other applications may consider all the documents you
> generate with that patched iText to be identical. This might result in them
> rejecting or silently discarding your documents as duplicates.
>
> Therefore, I would advice you to reconsider this part of your patch: Either
> generate an ID which is unique for the generated document but reproducible,
> or change the patch to not include a trailer ID at all.
>
> Regards, Michael.
> --
> View this message in context:
> http://itext-general.2136553.n4.nabble.com/how-to-get-zero-diff-on-two-consecutively-created-pdf-files-tp2718441p2718700.html
> Sent from the iText - General mailing list archive at Nabble.com.
>
>
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------------------------------------------------------------------------------
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and start using them to simplify application deployment and
accelerate your shift to cloud computing.
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