Jonathan created PDFBOX-4541:
--------------------------------
Summary: 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
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}
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