Such a document would be perfectly valid PDF.
For example, if I have a document that says that I owe you $200 but you use a
standard PDF editing tool (Acrobat, FoxIt, etc.) to change it to $2000 and do a
File->Save. That will create a new content stream with the new data and
potentially a bunch of other related objects, all pointed to by a new xref –
called an incremental update. So now you have both in the file. And some tools
would let you extract the original version.
If you wish to build a tool that processes PDF files in ways other than the
standard, there is nothing stopping you – but iText (as it stands today) is not
to the tool for you (nor are any other standard PDF library). You will need to
learn the details of PDF and either write your own or modify an existing one.
Leonard
From: adriano <asanton...@gmail.com<mailto:asanton...@gmail.com>>
Reply-To: Post here
<itext-questions@lists.sourceforge.net<mailto:itext-questions@lists.sourceforge.net>>
Date: Thursday, March 21, 2013 7:48 PM
To: Post here
<itext-questions@lists.sourceforge.net<mailto:itext-questions@lists.sourceforge.net>>
Subject: Re: [iText-questions] Duplicate indirect objects
Ok, then suppose the incoming PDF document includes a stream object containing
text that would cause trouble to the recipient if it only was visible, but it
is not because it is not referenced in any page that the document is officially
comprised of, according to the "effective" document Catalog. This document
might even contain an extra Catalog that would cause the invisible text to
become visible, if it only was in effect, but is not because it is located in
an area of the PDF file that is also ignored. Again, I would rise my eyebrow if
I noticed something like that "by hand", and still more I would like to detect
such a situation if I was processing a PDF document in an unattended way.
I perfectly understand that by processing the PDF document in a standard way
that extra objects would just be ignored.
I just would like to detect such situations -- of course by processing the PDF
in a non-standard way.
I also understand from your comments that you consider my arguments just
nonsense, okay.
I just tried to ask....
On Wed, Mar 13, 2013 at 3:49 PM, Leonard Rosenthol-3 [via iText - General]
<[hidden email]</user/SendEmail.jtp?type=node&node=4657874&i=0>> wrote:
On 3/13/13 3:12 PM, "adriano" <[hidden
email]<http://user/SendEmail.jtp?type=node&node=4657816&i=0>> wrote:
>Now, mkl, suppose you have to "process" the incoming PDF document as a
>whole, without altering it in any way....
Yes and no.
The process by which one processes a PDF document, where one starts with
the trailer->root/Catalog->Š, would mean that any objects that are NOT
referenced in the current xref table OR that are not linked into the
object tree, will be ignored.
Leonard
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