tomas kochan created PDFBOX-4750:
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Summary: java.io.IOException: Error:Unknown type in content
stream:COSNull{}
Key: PDFBOX-4750
URL: https://issues.apache.org/jira/browse/PDFBOX-4750
Project: PDFBox
Issue Type: Bug
Affects Versions: 2.0.18, 2.0.8
Reporter: tomas kochan
By removing some optional content for specific document, which is bordered with
Operator BDC and EMC, we are facing an issue by writing the changed set of
tokens into PDStream.
The code looks like:
PDStream updatedStream = new PDStream(document);
OutputStream out = updatedStream.getCOSObject().createRawOutputStream();
ContentStreamWriter tokenWriter = new ContentStreamWriter(out);
tokenWriter.writeTokens(result);
out.flush();
out.close();
page.setContents(updatedStream);
The following exception occurs at line 'tokenWriter.writeTokens(result);' :
java.io.IOException: Error:Unknown type in content stream:COSNull{}
at
org.apache.pdfbox.pdfwriter.ContentStreamWriter.writeObject(ContentStreamWriter.java:199)
at
org.apache.pdfbox.pdfwriter.ContentStreamWriter.writeObject(ContentStreamWriter.java:146)
at
org.apache.pdfbox.pdfwriter.ContentStreamWriter.writeObject(ContentStreamWriter.java:181)
at
org.apache.pdfbox.pdfwriter.ContentStreamWriter.writeTokens(ContentStreamWriter.java:109)
at
de.justiz.eip.pdf.tools.PdfContext.getOrRemoveOptionalTextContentfromPage(PdfContext.java:429)
at
de.justiz.eip.pdf.tools.paging.PagingInfoInterpreterPdfContext.removePagingInfo(PagingInfoInterpreterPdfContext.java:325)
After the analyze we figured out two issues:
1. We assume, the Pdf Document it's self is corrupted, It contains on some
place operator BI, which is based on the PDF-Reference-V1.7 a begin of inline
image object. This Operator is not followed by "ID" or "EI" operator.
Extract from list of Tokens:
next PDFOperator\{Do}
next COSFloat\{0.016674607}
next COSInt\{0}
next COSInt\{0}
next COSFloat\{0.061831153}
next COSFloat\{0.070509767}
next COSFloat\{-0.302021403}
next PDFOperator\{cm}
next PDFOperator\{BI}
next PDFOperator\{Q}
next PDFOperator\{Q}
next COSName\{OC}
next COSName\{eAkteOptionalContent7}
next PDFOperator\{BDC}
Moreover one "DP" Entry in the "BI" operator's COSDictionary contains COSArray
with COSNull values. However the assumption is, that the COSNull values are not
forbidden in the Pdf content.
COSDictionary\{COSName{Interpolate}:true;COSName\{W}:COSInt\{35};COSName\{H}:COSInt\{26};COSName\{CS}:COSName\{RGB};COSName\{BPC}:COSInt\{8};COSName\{F}:COSArray\{[COSName{A85},COSName\{DCT}]};COSName\{DP}:COSArray{[COSNull{},COSNull{}]};}
2. Despite wrong content in the pdf-document (described above) the PDF-Box api
crashed by storing this operators into PDStream by his inability to recognize
COSNull in the method
org.apache.pdfbox.pdfwriter.ContentStreamWriter.writeObject(Object)
The assumption on this place is, that the method "writeObject" forgot to cover
COSNull as an valid input. The org.apache.pdfbox.cos.COSNull.NULL is valid
Object, which is broadly used by PDF-Api itself.
The Method org.apache.pdfbox.pdfwriter.ContentStreamWriter.writeObject(Object)
PDF-Api 2.0.8, also in 2.0.18 doesn't cover the COSNull case in it's if/else
conditions, instead of it throws the new IOException( "Error:Unknown type in
content stream:" + o ).
Could you confirm, that the method writeObject contains bug and should be
corrected to cover also COSNull Object? If so, in which version could we expect
the fix?
Thank you
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