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From Maruan Sahyoun <sahy...@fileaffairs.de>
Subject Re: problem with pdf eof
Date Thu, 16 Oct 2014 09:54:48 GMT
when you say invalid do you mean it’s corrupted or e.g. you get a warning sign in Adobe Reader?
Would you have a sample PDF?

When you sign a document and sign it again the first signature points to a different document
revision as you have changed the documents content afterwards. So invalid in that context
could mean that the warning you might be getting is only reflecting that fact. Would need
to see the document to  understand what’s going on.


Am 16.10.2014 um 11:48 schrieb Vomlel Jan <Jan.Vomlel@aipsafe.cz>:

> Hi Maruan and others,
> I created signature and it seems OK. 
> But when I create second signature (loadNonSeq, addSignature, saveIncremental again),
the first signature becomes invalid. 
> I think that there can be problem, that first page is updated (signatur is invisible),
but I dont understand it enough. 
> Jan
> -----Original Message-----
> From: Maruan Sahyoun [mailto:sahyoun@fileaffairs.de] 
> Sent: Monday, October 13, 2014 4:09 PM
> To: users@pdfbox.apache.org
> Subject: Re: problem with pdf eof
> Hi Jan,
> there are sample in the examples package for various ways to sign a document [1]. Signing
a document needs incremental saving.
> OTOH choosing the right solution should not be made on the base if there is a license
fee or not. 
> Maruan Sahyoun
> [1] http://svn.apache.org/viewvc/pdfbox/trunk/examples/src/main/java/org/apache/pdfbox/examples/signature/
> Am 13.10.2014 um 16:02 schrieb Vomlel Jan <Jan.Vomlel@aipsafe.cz>:
>> Hi Maruan (and others),
>> I would like to use pdfbox and bouncycastle for managing pdf signatures. Parsing,
validation, timestamping (PADES LTV) . 
>> We used itext for it, but it is under commercial licence.
>> Parsing signatures seems to be working (thanks to your advice). So I will try to
create timestamp. 
>> Is it possible with pdfbox?  I found save method on PDDocument, but Iˇm afraid,
that it can change bite representation of pdf, and signatures become invalid. Is it true?
What is right way to create signature or timestamp with pdfbox?
>> Jan
>> -----Original Message-----
>> From: Maruan Sahyoun [mailto:sahyoun@fileaffairs.de] 
>> Sent: Friday, October 10, 2014 10:44 AM
>> To: users@pdfbox.apache.org
>> Subject: Re: problem with pdf eof
>> Hi Jan,
>> choosing the right technology is very important so I do understand your concerns.
I had to make such decision about using PDFBox in the past too. 
>> It can 
>> If you have specific issues I can answer I’m happy to try to do so. As a general
statement PDFBox is used in production environments today (as an example we ourselves are
using it for a banking customer to process account statements, an airline company to preprocess
archiving documents and various other customers). 
>> PDFBox is continuously enhancing the parsing as we try to deal with real world PDF
files which are not always inline with the the PDF specification. Currently the best approach
is to use PDDocument.loadNonSeq (which parses documents according to the Xref information)
and in case of an exception PDDocument.load (which parses sequentially). The Apache Tika project,
which uses PDFBox for parsing PDF’s, is running the parsing and text extraction against
50k PDFs being made available via http://digitalcorpora.org
>> What is the application you would like to be using PDFBox for? Text Extraction, image
conversion …. - I might be able to give you more specific information for your use case.
>> BR
>> Maruan
>> Am 10.10.2014 um 10:10 schrieb Vomlel Jan <Jan.Vomlel@aipsafe.cz>:
>>> Thank you Maruan, this function loads document.
>>> I have read https://pdfbox.apache.org/ideas.html "Replace/Enhance PDF parsing".
I think correct parsing is very important, and I have some doubts, if I can use pdfbox in
production. Can you say something to rest me :-).
>>> Jan
>>> -----Original Message-----
>>> From: Maruan Sahyoun [mailto:sahyoun@fileaffairs.de] 
>>> Sent: Friday, October 10, 2014 9:25 AM
>>> To: users@pdfbox.apache.or
>>> Subject: Re: problem with pdf eof
>>> Hi 
>>> you can try PDDocument.loadNonSeq(InputStream is, null) 
>>> BR
>>> Maruan
>>> Am 10.10.2014 um 09:09 schrieb Vomlel Jan <Jan.Vomlel@aipsafe.cz>:
>>>> Hello,
>>>> I use PDFBox 1.8.7  PDDocument.load(InputStream is) method to parse PDF document
in attachement.
>>>> Method return without exception, but document model is incomplete.
>>>> Problem is in characters after EOF (ofset 22939):
>>>> startxref
>>>> 22449
>>>> %%EOF
>>>> @
>>>> 16 0 obj
>>>> << 
>>>> /Type /Catalog
>>>> PDFBox create internal IOException and ignore it with comment:
>>>>                  /*
>>>>                   * PDF files may have random data after the EOF marker.
Ignore errors if
>>>>                   * last object processed is EOF.
>>>>                   */
>>>> Is this PDF construction valid?
>>>> Which parser in PDFBox is correct? I tried ConformingPDParser, but another
error occured.
>>>> Jan
>>>> Tento e-mail ani žádný z připojených souborů nejsou přijetím návrhu
na uzavření smlouvy, ledaže je to v nich výslovně uvedeno. Pokud tomu tak není, nelze
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uvedeny jako příjemci, a jeho obsah, včetně obsahu všech připojených souborů, je důvěrný.
Jestliže nejste oprávněný příjemce, zdržte se, prosím, jakékoliv formy zveřejnění,
reprodukce, kopírování, distribuce nebo šíření jeho obsahu, včetně obsahu všech
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těchto e mailů souhlasí, že mohou být čteny jinými zaměstnanci AiP Safe s.r.o., než
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