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."
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.
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 <[email protected]>
wrote:
Am 22.05.2015 um 08:28 schrieb Andreas Lehmkühler:
Hi,
Balaji Venkatamohan <[email protected]> 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 <[email protected]>
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 <
[email protected]
<mailto:[email protected]>> 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
<[email protected] <mailto:[email protected]>> 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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