Hi,
"How to properly decompress the PDF using pdfbox APIs" - see the source
code of WriteDecodedDoc:
https://svn.apache.org/viewvc/pdfbox/branches/1.8/pdfbox/src/main/java/org/apache/pdfbox/WriteDecodedDoc.java?view=markup&sortby=date
How was the decompressing of the PDF from your customer done - did your
customer also use PDFBox? Or something else?
And I read in the first post that the decompressed customer file was OK,
but not the compressed file... so the problem is to find if something
is missing in the compressed file, or if PDFBox has a bug causing to
miss it.
Tilman
PS: image didn't go through. Maybe upload it to imageshack.us.
Am 20.05.2015 um 03:24 schrieb Balaji Venkatamohan:
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.
On Tue, May 19, 2015 at 2:57 PM, Tilman Hausherr
<[email protected] <mailto:[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]>
<mailto:[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]>
<mailto:[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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