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Posted to dev@pdfbox.apache.org by "W B (JIRA)" <ji...@apache.org> on 2014/10/20 21:48:34 UTC

[jira] [Created] (PDFBOX-2440) xref stream is saved as table

W B created PDFBOX-2440:
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             Summary: xref stream is saved as table
                 Key: PDFBOX-2440
                 URL: https://issues.apache.org/jira/browse/PDFBOX-2440
             Project: PDFBox
          Issue Type: Bug
          Components: Writing
    Affects Versions: 1.8.7
            Reporter: W B


When saving a PDDocument, PdfBox seems to always write an xref table, even when the original file contains an xref stream.

To reproduce, load a PDF file (like the one attached) with PDDocument#load (or PDDocument#loadNonSeq, same result) and then save it with PDDocument#save to another file.

It seems to me that the problem is in COSWriter#doWriteXRef. When doc#isXRefStream is true, the xref entries should be wrapped in a stream, but they're written to output one by one. I think that part should look more like its counterpart in COSWriter#doWriteXRefInc.

I made some changes to doWriteXRef accordingly and it seems to work for PDFs that have never been incrementally updated but leads to corrupt files when the PDF has been incrementally updated before :(



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