[
https://issues.apache.org/jira/browse/PDFBOX-4541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16837381#comment-16837381
]
Jonathan commented on PDFBOX-4541:
----------------------------------
I've now uploaded a file. It originally contained confidential data in images,
so I replaced the image streams with the appropriate amount of dummy
characters. This of course breaks the display of the original pdf.
Linearized.pdf is the output of our algorithm. Note the value of /CalRGB in the
resulting file. As a comparison, linearized_withfix.pdf contains the output
with the fix added.
> Incorrect? handling of direct/indirect objects
> ----------------------------------------------
>
> Key: PDFBOX-4541
> URL: https://issues.apache.org/jira/browse/PDFBOX-4541
> Project: PDFBox
> Issue Type: Bug
> Components: Parsing, Writing
> Affects Versions: 2.0.14
> Reporter: Jonathan
> Priority: Major
> Attachments: broken_censored.pdf, linearized.pdf,
> linearized_withfix.pdf
>
>
> We ran into some issues concerning blank pages in some of our resulting PDF
> documents. Investigation showed that some objects which were referenced were
> never actually written. We then noticed that these objects were never written
> because they missed the `isDirect` flag. We were able to mitigate this issue
> by adding
> {code:java}
> if (retval != null) {
> retval.setDirect(true);
> }
> return retval;
> {code}
> at the end of `BaseParser.parseDirObject()`.
> While the pdfs were now displayed correctly, QPDFs check reported erroneous
> hint tables. The offsets there were calculated incorrectly because the
> objects were now written not only once, but, in fact, several times in places
> where they should have been merely referenced. We eventually resolved this
> issue by replacing the if-condiction
> {code:java}
> if (willEncrypt || incrementalUpdate || subValue instanceof COSDictionary ||
> subValue == null)
> {code}
> in `COSWriter.visitFromArray(COSArray)` and
> `COSWriter.visitFromDictionay(COSDictionary)` with
> {code:java}
> if (willEncrypt || incrementalUpdate || subValue == null || !(subValue
> instanceof COSObject))
> {code}
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
