Hi;
Can anyone help me please?
---------- Forwarded message ----------
From: Nadav Ben Jakov <tbya...@gmail.com>
Date: Tue, Feb 10, 2015 at 6:34 PM
Subject: Re: [Podofo-users] Problem with enumerating objects with PoDoFo
To: Leonard Rosenthol <lrose...@adobe.com>
Hi,
I'm sorry for having pretty vogue explanations. I'm not trying to render
the stream's content nor to parse the streams as data. I just want to
print the section between 'stream' to 'endstream'.
As to printing, I basically write the stream to files as output, so they
are in fact "printable" for that matter. In the case I had given, I expect
to be able to open the ouput file with winzip/7zip later, and view its
content. if that stream would have contained a PE file's content, I would
have wanted to be able to execute the output file just like a normal PE
file.
Thanks in advance,
Nadav
On Tue, Feb 10, 2015 at 6:16 PM, Leonard Rosenthol <lrose...@adobe.com>
wrote:
> > I'm trying to extract each of the streams data out of all of the
> objects of a given PDF file,
> >and remove any encoding/encryption related to the PDF format
> >
> That is EXACTLY what PoDoFo is doing for you.
>
>
> > Later I'm printing each stream separately
> >
> Printing them in what way? Most (if not all) streams in a PDF aren’t in a
> format that would be printable. You have font data, color data, XML
> streams, etc. None of these make any sense to be printed. Even a page
> content stream isn’t necessarily printable.
>
>
> >In the example file I mentioned, I was hoping to extract that object
> steam (the zip file) and print it as a raw stream
> >
> I don’t understand what it means to “print a ZIP file as a raw stream”. A
> ZIP file itself can contain MANY files and in a rich hierarchical
> organization. So what would you be expecting to get back??
>
> What if it was a .exe file – which si also perfectly fine in a PDF –
> what would you be expecting to get back??
>
>
> >(again, I'm not after unzipping or decompressing the zip, just the
> plain object).
> >
> And I think that’s the problem here – you are expecting something that
> isn’t reasonable.
>
> Have you read the PDF Standard – ISO 32000-1 – or at least a good book
> on subject of PDF (eg. <http://shop.oreilly.com/product/0636920025269.do>)
> to get a better understanding of PDF?
>
>
> Leonard
>
> From: Nadav Ben Jakov
> Date: Tuesday, February 10, 2015 at 10:07 AM
>
> To: Leonard Rosenthol
> Subject: Re: [Podofo-users] Problem with enumerating objects with PoDoFo
>
> I'm trying to extract each of the streams data out of all of the
> objects of a given PDF file, and remove any encoding/encryption related to
> the PDF format. Later I'm printing each stream separately.
> I'm only trying to figure out if I can rely on PoDoFo parsing and
> extraction of any stream on any object, even if the stream in question is
> unfiltered/clear, I'm basically after the raw object's streams on these
> cases.
> In the example file I mentioned, I was hoping to extract that object steam
> (the zip file) and print it as a raw stream (again, I'm not after unzipping
> or decompressing the zip, just the plain object).
>
> Nadav
>
> On Tue, Feb 10, 2015 at 4:51 PM, Leonard Rosenthol <lrose...@adobe.com>
> wrote:
>
>> This stream IS clear (to use your term) as far as PDF is concerned. It
>> is neither filtered nor encrypted. Therefore you get the raw bits – which
>> in this case, happen to be a .zip file. But as mentioned, it might be
>> font data, ICC profile data or any other manner thing that can be put into
>> a PDF stream in various ways.
>>
>> Perhaps if you would explain the reason for your request, since it’s
>> unclear what you are trying to achieve at the end of the process.
>>
>> Leonard
>>
>> From: Nadav Ben Jakov
>> Date: Tuesday, February 10, 2015 at 9:02 AM
>> To: Leonard Rosenthol
>> Subject: Re: [Podofo-users] Problem with enumerating objects with PoDoFo
>>
>> Hi,
>>
>> Thank you for your quick answer, yet it didn't completely answered my
>> question: I need to get as an output all of the streams, regardless of
>> having /Filter or /Encrypt. If the object happens to contain a /Filter -
>> the stream should be decoded. If the stream is clear - it should only be
>> parsed and returned as clear stream.
>> Can PoDoFo (or any other PDF library for that matter) perform such
>> operation?
>>
>> Thanks in advance,
>> Nadav
>>
>> On Tue, Feb 10, 2015 at 3:38 PM, Leonard Rosenthol <lrose...@adobe.com>
>> wrote:
>>
>>> That stream that you show doesn’t have a filter. If it did, you’d
>>> see it on the stream dictionary.
>>>
>>> Instead, what you have is an unfiltered stream containing arbitrary
>>> data – which in this case, just happens to be a ZIP file. But it could
>>> just as well been a Word file, another PDF or even a .exe.
>>>
>>> There is nothing for PoDoFo (or any other PDF library) to do here.
>>>
>>> Leonard
>>>
>>> From: Nadav Ben Jakov
>>> Date: Tuesday, February 10, 2015 at 8:32 AM
>>> To: "podofo-users@lists.sourceforge.net"
>>> Subject: [Podofo-users] Problem with enumerating objects with PoDoFo
>>>
>>> Hi.
>>> I'm new to the PoDoFo library, and I've been trying to use it for my
>>> program.
>>> In general, my program needs to open a PDF file, decode all of its
>>> filters, decrypt them with default password (if necessary), and print out
>>> all decoded and decrypted objects.
>>> So I saw that podofouncompress (using the PoDoFo library) pretty much
>>> does that, so I tried to use the same library functions as he does. The
>>> whole project went great from that point untill I've encountered an error.
>>> Apparently the function PdfMemDocument::GetObjects() doesn't return all
>>> objects, but only those who had been handled (or loaded?). Anyway, it will
>>> be great to find out a way to get the entire pdf's object list decrypted
>>> and uncompressed (PdfMemDocument::UncompressObjects()).
>>>
>>> I've uploaded a sample file I've been woking on. In which object 2
>>> generation 0 is clearly a zip file "embedded":
>>>
>>> 2 0 obj
>>> <</Length 144>>stream
>>> PK ÏyJFëEŒ‰% &
>>>
>>> Text File.txtíÆ1
>>> 0 0+ ˜ f “ðpLþŒ´WsºâÖÛ ©ªªªªªª PK ÏyJFëEŒ‰% &
>>>
>>> Text File.txtPK ; P
>>> endstream
>>> endobj
>>>
>>> In the link bellow:
>>> http://www57.zippyshare.com/v/or6jqo28/file.html
>>>
>>> when scanning with podofo, only object 6 0 is available in the
>>> mentioned function's output, and podofouncompress completely ignores object
>>> object 2 0
>>>
>>> Thanks in advance,
>>> Nadav
>>>
>>
>>
>
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