Gents,
I'm using an older version of iTextSharp (4.1.6 equivalent), and recently
ran into a null pointer exception in PdfWriter while splitting a PDF file.
Never seen this before despite running all kinds of data for years. The
error happens on the PdfDocument Close() call, that leads to a
RotateAnnotations call, that calls writer.AddToBody, and eventually
GetNewObjectNumber in the PdfWriter is called and that method looks like
this:
protected internal virtual int GetNewObjectNumber(PdfReader reader, int
number, int generation) {
return currentPdfReaderInstance.GetNewObjectNumber(number, generation);
}
At the time the call is made, the currentPdfReaderInstance is null causing
the exception. I looked at the code in the repository for the latest, and
this method has not changed. I patched the code to check for null as such:
protected internal virtual int GetNewObjectNumber(PdfReader reader, int
number, int generation) {
if (currentPdfReaderInstance == null) {
currentPdfReaderInstance = reader.GetPdfReaderInstance(this);
}
return currentPdfReaderInstance.GetNewObjectNumber(number, generation);
}
This creates proper output. My question is, is this an acceptable patch or
should this be handled differently? Furthermore, it worries me that this has
not come up before - is it normal that the currentPdfReaderInstance is null
under these circumstances? I have not tried this under 5.0.2 but I suspect
that the same thing will happen - would it make sense to patch the latest?
Any feedback would be appreciated.
Thanks - Gylfi
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