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From Balaji Venkatamohan <bvenk...@tibco.com>
Subject Re: How to flatedecode and find all acroform fields in a compressed PDF
Date Wed, 27 May 2015 18:02:10 GMT
Thanks Tilman for letting the website developer know about the shortcomings
of their compression technique.

The PDF owner did not share with us the information about which website
they used for compressing the PDF. My teammates helped in identifying this
website. I will let the customer know about this particular website and
will leave it to them regarding continuing to use this website for their
PDF documents.

Could you also answer the following question please?
Would Pdfbox API change its code to accommodate the incorrect condition
that annotation fields (editable fields) are outside acro form fields as
well? I know the PDF compressed by the website is incorrect and hence I
would understand if you don't go ahead with this.

Thanks,
Balaji


On Tue, May 26, 2015 at 10:45 PM, Tilman Hausherr <THausherr@t-online.de>
wrote:

> I just tested it. It also removes /Outlines and /Metadata and more
> important data from PDF files.
>
> So your client can't share the PDF with us, but he shared it some website.
>
> A little research shows that this website is owned by Lauri Lehtinen from
> Talinn, Estonia.
> http://www.checkdomain.com/cgi-bin/checkdomain.pl?domain=pdfcompress.com
> https://www.linkedin.com/in/laurilehtinen
> https://twitter.com/laurii
>
> I also tweeted him.
>
> Tilman
>
>
> Am 27.05.2015 um 03:06 schrieb Balaji Venkatamohan:
>
>> Okay, I found out the online tool used by the customer to compress their
>> PDF.
>>
>> It is : https://www.pdfcompress.com/
>>
>> I don't need to rely on the PDF sent by the customer because all PDFs that
>> are available on the web, are compressed in the same manner by this tool,
>> that is, it gets rid of all acro form fields during compression.
>>
>> For example, the f941 govt form available at this site:
>> http://www.irs.gov/pub/irs-pdf/f941.pdf
>> If we compress this using the online tool, the resultant file size is very
>> low, which is good. However, there are no acro form fields in the
>> compressed PDF.
>>
>> Thanks,
>> Balaji
>>
>>
>>
>> On Sun, May 24, 2015 at 2:38 AM, Maruan Sahyoun <sahyoun@fileaffairs.de>
>> wrote:
>>
>>  Hi,
>>>
>>>  Am 23.05.2015 um 16:37 schrieb Balaji Venkatamohan <bvenkata@tibco.com
>>>> >:
>>>>
>>>> Hi,
>>>>
>>>> So AcroForms/Fields is an empty Array?
>>>>
>>>> Yes, in the filled interview_compressed.pdf, the acroforms are not null
>>>>
>>> but
>>>
>>>> empty. Size of array is zero.
>>>>
>>>> Also, I tried qpdf command line tool to compress the file interview.pdf
>>>>
>>> and
>>>
>>>> the resultant compressed file size of 1.6MB was no way near the file
>>>> size
>>>> of interview_compressed.pdf (21 KB).
>>>>
>>> would you think it's possible to get a similar PDF file or permission to
>>> use it internally so we have a sample to look at a potential fix.
>>>
>>> Although the PDF is not inline with the spec as Acrobat is able to handle
>>> it we could look into getting a similar result.
>>>
>>> BR
>>> Maruan
>>>
>>>
>>>  Thanks,
>>>> Balaji
>>>>
>>>> On Fri, May 22, 2015 at 11:58 PM, Maruan Sahyoun <
>>>> sahyoun@fileaffairs.de
>>>>
>>>> wrote:
>>>>
>>>>  Hi,
>>>>>
>>>>>  Am 22.05.2015 um 23:00 schrieb Balaji Venkatamohan <
>>>>>> bvenkata@tibco.com
>>>>>>
>>>>> :
>>>>
>>>>> I opened the interview_compressed in notepad++ and did not see any
>>>>>> 'Acroform' text anywhere.
>>>>>> However, as Maruan suggested, I entered some data into what looks
like
>>>>>>
>>>>> form
>>>>>
>>>>>> fields of interview_compressed.pdf and saved it. When I opened this
>>>>>>
>>>>> file
>>>
>>>> in
>>>>>
>>>>>> notepad++, I did see 'Acroform' text in it. I also noticed an increase
>>>>>>
>>>>> in
>>>
>>>> file size from 21 KB to ~530 KB.
>>>>>>
>>>>>> I then ran this filled saved compressed PDF in pdfdebugger.java and
>>>>>> saw
>>>>>> that the field values were getting stored but not under Acroform
>>>>>> fields
>>>>>>
>>>>> but
>>>>>
>>>>>> under Annotations.
>>>>>>
>>>>>
>>>>>
>>>>> So AcroForms/Fields is an empty Array?
>>>>>
>>>>>  Please refer to this image:
>>>>>>
>>>>>> http://imageshack.com/a/img540/9951/QGLDtS.jpg
>>>>>>
>>>>>> So, whatever the compression technique was, it simply made all the
>>>>>>
>>>>> Acroform
>>>>>
>>>>>> fields disappear from the original PDF but retained all annotations
>>>>>>
>>>>> which
>>>
>>>> also contain the interactive forms and this helped reduce the file size
>>>>>>
>>>>> so
>>>>>
>>>>>> much? If this is the case, can pdfbox API also use similar compression
>>>>>> technique to compress such a a huge file into a smaller one?
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Fri, May 22, 2015 at 1:25 PM, Maruan Sahyoun <
>>>>>>
>>>>> sahyoun@fileaffairs.de>
>>>
>>>> wrote:
>>>>>>
>>>>>>  Hi,
>>>>>>>
>>>>>>>  Am 22.05.2015 um 21:54 schrieb Tilman Hausherr <
>>>>>>>>
>>>>>>> THausherr@t-online.de
>>>
>>>> :
>>>>>>
>>>>>>> Am 22.05.2015 um 17:53 schrieb Balaji Venkatamohan:
>>>>>>>>
>>>>>>>>> Hello,
>>>>>>>>>
>>>>>>>>> I used PdfDebugger to make the internal PDF structure
of the two
>>>>>>>>>
>>>>>>>> files
>>>
>>>> (1)
>>>>>>>
>>>>>>>> interview.pdf and (2) interview_compressed.pdf  visually
available
>>>>>>>>>
>>>>>>>> and I
>>>>>
>>>>>> have uploaded my images to imageshack. Here are the four links:
>>>>>>>>>
>>>>>>>>> http://imageshack.com/a/img538/8277/JghCpG.jpg
>>>>>>>>> http://imageshack.com/a/img909/6140/KsYNGR.jpg
>>>>>>>>> http://imageshack.com/a/img903/8644/mk15As.jpg
>>>>>>>>> http://imageshack.com/a/img901/8610/NXe3mJ.jpg
>>>>>>>>> http://imageshack.com/a/img673/8633/0GMdjQ.jpg
>>>>>>>>>
>>>>>>>>> The first two links are from the internal structure of
>>>>>>>>> interview.pdf
>>>>>>>>> (original uncompressed file)
>>>>>>>>> The third and fourth links are from the internal structure
of
>>>>>>>>> interview_compressed.pdf (compressed file)
>>>>>>>>> The fifth link compares the file sizes of the two files
and as you
>>>>>>>>>
>>>>>>>> can
>>>
>>>> also
>>>>>>>
>>>>>>>> see, the difference is huge.
>>>>>>>>>
>>>>>>>>> As you might notice, the file interview_compressed.pdf
has no
>>>>>>>>>
>>>>>>>> acroform
>>>
>>>> Indeed... but this is needed - from the spec:
>>>>>>>>
>>>>>>>> "The contents and properties of a document’s interactive
form shall
>>>>>>>>
>>>>>>> be
>>>
>>>> defined by an interactive form dictionary that shall be referenced
>>>>>>>
>>>>>> from
>>>
>>>> the
>>>>>
>>>>>> AcroForm entry in the document catalogue (see 7.7.2, “Document
>>>>>>>
>>>>>> Catalog”).
>>>>>
>>>>>> Table 218 shows the contents of this dictionary."
>>>>>>> correct
>>>>>>>
>>>>>>>  fields listed even though opening the PDF in pdf reader allows
me to
>>>>>>>>>
>>>>>>>> enter
>>>>>>>
>>>>>>>> values in places which look like AcroForm fields and also
save them.
>>>>>>>>>
>>>>>>>> Are
>>>>>
>>>>>> there any other PDF 'types' similar to Acroform fields which would
>>>>>>>>>
>>>>>>>> enable
>>>>>>>
>>>>>>>> users to fill data and which can be accessed in PdfBox APIs
without
>>>>>>>>>
>>>>>>>> having
>>>>>>>
>>>>>>>> to go through PDAcrofield?
>>>>>>>>>
>>>>>>>> Yes, annotations... there are some common parts, but this
is just a
>>>>>>>>
>>>>>>> vague observation from me, I'm not the acroform specialist.
>>>>>>>
>>>>>>> from a first glance it looks like there are all entries necessary
to
>>>>>>>
>>>>>> (re-)
>>>>>
>>>>>> generate the form fields. That's what's likely happening for this
>>>>>>>
>>>>>> document
>>>>>
>>>>>> in Adobe Reader. Would be interesting to see what's being save after
>>>>>>>
>>>>>> the
>>>
>>>> forms has been filled out and saved using Acrobat. We'd need a test
>>>>>>>
>>>>>> form to
>>>>>
>>>>>> come up with an enhancement like this.
>>>>>>>
>>>>>>> BR
>>>>>>> Maruan
>>>>>>>
>>>>>>>
>>>>>>>  What you should do: use NOTEPAD++ to look whether there's
>>>>>>>> "/AcroForm"
>>>>>>>>
>>>>>>> in
>>>>>
>>>>>> the "compressed" file.
>>>>>>>
>>>>>>>> - if it is missing, tell the client (or your boss) just that
>>>>>>>> - if it isn't missing, then there's some problem in PDFBox
(try also
>>>>>>>>
>>>>>>> the
>>>>>
>>>>>> loadNonSeq I mentioned earlier)
>>>>>>>
>>>>>>>> Tilman
>>>>>>>>
>>>>>>>>  You can use qpdf , then use these options:
>>>>>>>>>
>>>>>>>>> I will now try using this link to compress the original
file.
>>>>>>>>>
>>>>>>>>> Another strategy to think about - can your client generate
a
>>>>>>>>> non-confidential file, so that you can share it, and
the
>>>>>>>>>
>>>>>>>> "compressed"
>>>
>>>> file?
>>>>>>>
>>>>>>>> I wish I had direct communication with the clients but due
to
>>>>>>>>>
>>>>>>>> bureaucracy,
>>>>>>>
>>>>>>>> I am having to go through multiple layers to get my message
across
>>>>>>>>>
>>>>>>>> to
>>>
>>>> them.
>>>>>>>
>>>>>>>> I will share more information as soon as I have them.
>>>>>>>>>
>>>>>>>>> PS: i sent these image links to my personal email first
to make
>>>>>>>>> sure
>>>>>>>>>
>>>>>>>> that I
>>>>>>>
>>>>>>>> can open them. I could and so I am hoping you all could too.
If you
>>>>>>>>>
>>>>>>>> are
>>>>>
>>>>>> unable to open them, please let me know.
>>>>>>>>>
>>>>>>>>> Thanks,
>>>>>>>>> Balaji
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Fri, May 22, 2015 at 6:45 AM, Tilman Hausherr <
>>>>>>>>>
>>>>>>>> THausherr@t-online.de
>>>>>
>>>>>> wrote:
>>>>>>>>>
>>>>>>>>>  Am 22.05.2015 um 08:28 schrieb Andreas Lehmkühler:
>>>>>>>>>>
>>>>>>>>>>  Hi,
>>>>>>>>>>>
>>>>>>>>>>> Balaji Venkatamohan <bvenkata@tibco.com>
hat am 20. Mai 2015 um
>>>>>>>>>>>
>>>>>>>>>> 03:24
>>>>>>>
>>>>>>>> geschrieben:
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> Thank you for your pointers and sorry about
the image. I am
>>>>>>>>>>>>
>>>>>>>>>>> attaching it
>>>>>>>
>>>>>>>> with this email.
>>>>>>>>>>>>
>>>>>>>>>>>> The point I am trying to make is that the
PDF, which was
>>>>>>>>>>>>
>>>>>>>>>>> decompressed
>>>>>
>>>>>> using
>>>>>>>>>>>> WriteDecodedDoc, is smaller in size than
the original PDF given
>>>>>>>>>>>>
>>>>>>>>>>> to
>>>
>>>> us by
>>>>>>>
>>>>>>>> our customers.
>>>>>>>>>>>> Also, the decompressed PDF generated by WriterDecodedDoc
of
>>>>>>>>>>>>
>>>>>>>>>>> PDFBox
>>>
>>>> did
>>>>>>>
>>>>>>>> not
>>>>>>>>>>>> have any PDAcroform fields whereas the decompressed
PDF given to
>>>>>>>>>>>>
>>>>>>>>>>> us
>>>
>>>> by
>>>>>>>
>>>>>>>> the
>>>>>>>>>>>> customers does contain Acroform fields. Hence
I wanted to know
>>>>>>>>>>>>
>>>>>>>>>>> how
>>>
>>>> to
>>>>>
>>>>>> properly decompress the PDF using pdfbox APIs. The reason why I
>>>>>>>>>>>>
>>>>>>>>>>> was
>>>
>>>> analyzing COSStream was to check if the decompression of the
>>>>>>>>>>>>
>>>>>>>>>>> compressed
>>>>>>>
>>>>>>>> PDF
>>>>>>>>>>>> was happening correctly while using PDFBox
APIs.
>>>>>>>>>>>> I know it would have been difficult for you
to help me without
>>>>>>>>>>>>
>>>>>>>>>>> the
>>>
>>>> actual
>>>>>>>
>>>>>>>> PDFs. For that, I would like to thank you for your time and
>>>>>>>>>>>>
>>>>>>>>>>> pointers.
>>>>>
>>>>>> Maybe it's worth to try to share the file "visually" with us. Open
>>>>>>>>>>>
>>>>>>>>>> both
>>>>>>>
>>>>>>>> files
>>>>>>>>>>> (compressed and decompressed) with PDFDebugger
[1] and post a
>>>>>>>>>>>
>>>>>>>>>> screenshot
>>>>>>>
>>>>>>>> of both
>>>>>>>>>>> somehwere (dropbox etc.) and share the link with
us. Maybe that
>>>>>>>>>>>
>>>>>>>>>> could
>>>>>
>>>>>> shed some
>>>>>>>>>>> light on your issue.
>>>>>>>>>>>
>>>>>>>>>>>  @Balaji: here's an example on how such a screenshot
would look
>>>>>>>>>>
>>>>>>>>> like:
>>>
>>>> http://home.snafu.de/tilman/tmp/pdfdebugger-screenshot.png
>>>>>>>>>>
>>>>>>>>>> Tilman
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>  BR
>>>>>>>>>>> Andreas Lehmkühler
>>>>>>>>>>>
>>>>>>>>>>> [1] http://pdfbox.apache.org/1.8/commandline.html#pdfDebugger
>>>>>>>>>>>
>>>>>>>>>>> On Tue, May 19, 2015 at 2:57 PM, Tilman Hausherr
<
>>>>>>>>>>>
>>>>>>>>>> THausherr@t-online.de>
>>>>>>>
>>>>>>>> wrote:
>>>>>>>>>>>>
>>>>>>>>>>>> Hi,
>>>>>>>>>>>>
>>>>>>>>>>>>> The image doesn't appear in the mailing
list.
>>>>>>>>>>>>>
>>>>>>>>>>>>> This is all very confusing... /acroform
is in the document
>>>>>>>>>>>>>
>>>>>>>>>>>> catalog.
>>>>>
>>>>>> I
>>>>>>>
>>>>>>>> don't see how the page content stream is related to it. The
best
>>>>>>>>>>>>>
>>>>>>>>>>>> is
>>>>>
>>>>>> that
>>>>>>>
>>>>>>>> you either go through the source code, or read the spec and
then
>>>>>>>>>>>>>
>>>>>>>>>>>> look at
>>>>>>>
>>>>>>>> the pdf.
>>>>>>>>>>>>>
>>>>>>>>>>>>> To find out what's going on, you'd have
to start from that
>>>>>>>>>>>>>
>>>>>>>>>>>> /acroform
>>>>>
>>>>>> entry
>>>>>>>>>>>>> and then compare the two files.
>>>>>>>>>>>>>
>>>>>>>>>>>>> It is really difficult to help you without
the files. The cause
>>>>>>>>>>>>>
>>>>>>>>>>>> could
>>>>>>>
>>>>>>>> be a
>>>>>>>>>>>>> bug in pdfbox, or a malformed pdf...
>>>>>>>>>>>>>
>>>>>>>>>>>>> Some more ideas:
>>>>>>>>>>>>> - use loadNonSeq(file, null) instead
of load(file)
>>>>>>>>>>>>> - try the unreleased 2.0 version, that
one has some
>>>>>>>>>>>>> improvements
>>>>>>>>>>>>>
>>>>>>>>>>>> in
>>>>>
>>>>>> the
>>>>>>>
>>>>>>>> acroform stuff. Note that the API is different.
>>>>>>>>>>>>> https://pdfbox.apache.org/download.cgi#scm
>>>>>>>>>>>>> https://pdfbox.apache.org/2.0/getting-started.html
>>>>>>>>>>>>>
>>>>>>>>>>>>> If you still need help, one possibility
would be 1) post the
>>>>>>>>>>>>>
>>>>>>>>>>>> smallest
>>>>>>>
>>>>>>>> possible code that fails, and 2) post a small part of the
raw
>>>>>>>>>>>>>
>>>>>>>>>>>> PDF,
>>>
>>>> i.e.
>>>>>>>
>>>>>>>> the
>>>>>>>>>>>>> objects relevant to the field in your
code.
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> Tilman
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> Am 19.05.2015 um 23:03 schrieb Balaji
Venkatamohan:
>>>>>>>>>>>>>
>>>>>>>>>>>>> Moreover, for every page of the compressed
PDF (there are 3
>>>>>>>>>>>>>
>>>>>>>>>>>> pages), I
>>>>>>>
>>>>>>>> tried getting the COSStream for each of the page :
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> PDPage firstPage=(PDPage)
>>>>>>>>>>>>>> document.getDocumentCatalog().getAllPages().get(0);
>>>>>>>>>>>>>>             pdStream=firstPage.getContents();
>>>>>>>>>>>>>>             COSStream stream=pdStream.getStream();
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> In the above code snippet, the object
stream, when analyzed in
>>>>>>>>>>>>>>
>>>>>>>>>>>>> debug
>>>>>>>
>>>>>>>> mode, has the following:
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> The line from the compressed PDF
as opened with Notepad++ is :
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> <</Filter/FlateDecode/Length
5675>>stream
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>  From this point on, using the COSStream
object for every
>>>>>>>>>>>>>> page,
>>>>>>>>>>>>>>
>>>>>>>>>>>>> how
>>>>>
>>>>>> can I
>>>>>>>>>>>>>> decompress and find out the acroform
fields given that the
>>>>>>>>>>>>>> unFilteredStream
>>>>>>>>>>>>>> object is null for COSStream?
>>>>>>>>>>>>>> ​
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> On Tue, May 19, 2015 at 1:38 PM,
Balaji Venkatamohan <
>>>>>>>>>>>>>> bvenkata@tibco.com
>>>>>>>>>>>>>> <mailto:bvenkata@tibco.com>>
wrote:
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>     Thank you for your response Tilman.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>     I had previously tried using
the WriteDecodedDoc for my
>>>>>>>>>>>>>>
>>>>>>>>>>>>> compressed
>>>>>>>
>>>>>>>>     PDF and I tried to get the number of acro form fields
>>>>>>>>>>>>>>
>>>>>>>>>>>>> present
>>>
>>>> in
>>>>>>>
>>>>>>>> the output file generated by WriteDecodedDoc. The API still
>>>>>>>>>>>>>>
>>>>>>>>>>>>> could
>>>>>
>>>>>>     not find the acro form fields in the generated decompressed
>>>>>>>>>>>>>>
>>>>>>>>>>>>> file.
>>>>>>>
>>>>>>>>      Also the decompressed file generated is 75 KB which
is far
>>>>>>>>>>>>>>
>>>>>>>>>>>>> less
>>>>>>>
>>>>>>>>     than the original decompressed file which I have (1.6
MB)
>>>>>>>>>>>>>>
>>>>>>>>>>>>> though I
>>>>>>>
>>>>>>>>     could edit the acro form fields using acrobat reader.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>     Thanks,
>>>>>>>>>>>>>>     Balaji
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>     On Tue, May 19, 2015 at 1:18
PM, Tilman Hausherr
>>>>>>>>>>>>>>     <THausherr@t-online.de <mailto:THausherr@t-online.de>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>> wrote:
>>>>>
>>>>>>         Am 19.05.2015 um 21:35 schrieb Balaji Venkatamohan:
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>             My question is: how do
I flatedecode a PDF so
>>>>>>>>>>>>>> that I
>>>>>>>>>>>>>>
>>>>>>>>>>>>> can
>>>>>>>
>>>>>>>>             find all the
>>>>>>>>>>>>>>             acroform fields within
it. ANy help or pointers
>>>>>>>>>>>>>>
>>>>>>>>>>>>> would
>>>
>>>> be
>>>>>>>
>>>>>>>>             highly appreciated.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>         You could try the WriteDecodedDoc
option of the
>>>>>>>>>>>>>> command
>>>>>>>>>>>>>>
>>>>>>>>>>>>> line
>>>>>>>
>>>>>>>> app
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>> https://pdfbox.apache.org/1.8/commandline.html#writeDecodeDoc
>>>>>>>
>>>>>>>>         Maybe you can have further ideas by comparing the
two
>>>>>>>>>>>>>>
>>>>>>>>>>>>> files
>>>>>>>
>>>>>>>>         with NOTEPAD++.... however the two files might have
>>>>>>>>>>>>>>
>>>>>>>>>>>>> their
>>>
>>>>         objects in different order.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>         Tilman
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>> ---------------------------------------------------------------------
>>>>>>>
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>>>>>>>
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>>>>>>>
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>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
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