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  1. PDFBox
  2. PDFBOX-3024

Preflight validation call PDType0Font.clear at the wrong time

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Details

    • Bug
    • Status: Closed
    • Major
    • Resolution: Fixed
    • 1.8.10
    • 1.8.12
    • Preflight
    • None

    Description

      I used the algorythm here to test PDF / A compliance :
      https://pdfbox.apache.org/1.8/cookbook/pdfavalidation.html

      With one pdf document (which i cant give you due to confidentiality), an NullPointerException occur here :

      java.lang.NullPointerException
      	at org.apache.pdfbox.pdmodel.font.PDType0Font.getFontWidth(PDType0Font.java:188)
      	at org.apache.pdfbox.preflight.font.container.FontContainer.checkGlyphWith(FontContainer.java:114)
      	at org.apache.pdfbox.preflight.content.ContentStreamWrapper.validText(ContentStreamWrapper.java:372)...
      

      As i dug deeper, i found that preflight loads a font context where it puts all pdf fonts. The PDType0Font is also created and put in this context.

      (CSObject : COSDictionary{(COSName{BaseFont}:COSName{INWHIX+TimesNewRomanPSMT})       (COSName{DescendantFonts}:COSArray{[COSObject{349, 0}]}) (COSName{Encoding}:COSName{Identity-H})       (COSName{Subtype}:COSName{Type0}) (COSName{ToUnicode}:COSDictionary{(COSName{Filter}:COSName{FlateDecode})      (COSName{Length}:COSInt{260}) }) (COSName{Type}:COSName{Font}) })
      

      The problem is that at the end of one step of the analysis, the clear method is called on the PDType0Font (see eclipse-1.jpg), but the font is still present in the context. On a second step, the same font is retrieved from the context, with no data in it, and the NullPointerException occurs (see eclipse-2.jpg).

      I tried the validation after removing the clear method from PDType0Font and it works just fine.

      I think the problem comes from this context, and a clear on a font should also trigger a deletion in this map.

      Attachments

        1. 004973.pdf
          840 kB
          Tilman Hausherr
        2. eclipse-1.jpg
          309 kB
          Guillaume Monteils
        3. eclipse-2.jpg
          312 kB
          Guillaume Monteils
        4. pdfa-1b_fonts_TT_Type0.pdf
          101 kB
          Petras
        5. PDFBOX_3024_dont_clear_resources.patch
          2 kB
          Petras
        6. PDFBox.png
          56 kB
          Guillaume Monteils
        7. PDF-Tools.png
          24 kB
          Guillaume Monteils

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              tilman Tilman Hausherr
              ikikrepus Guillaume Monteils
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                Created:
                Updated:
                Resolved: