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https://issues.apache.org/jira/browse/PDFBOX-3024?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Petras updated PDFBOX-3024:
---------------------------
Attachment: pdfa-1b_fonts_TT_Type0.pdf
It seems that clearing the {{FontContainer}} with your patch instead of
preserving the resource by {{ContentStreamWrapper}} introduced another issue. I
get validation error with attached file containing TrueType and Type 0 fonts:
{quote}ERROR_FONTS_UNKNOWN_FONT_REF: Glyph error, ABCDEE+Calibri is unknown
wasn't found by the FontHelperValdiator.{quote}
What is the reason that popping out the last resource form
{{streamResourcesStack}} and its clearing are done in the same
{{ContentStreamWrapper#clearAfterProcessSubStream}} method? It means, in
overriding method I cannot disable {{PDResources#clear()}} without disabling
{{streamResourcesStack#pop()}} as well.
> Preflight validation call PDType0Font.clear at the wrong time
> -------------------------------------------------------------
>
> Key: PDFBOX-3024
> URL: https://issues.apache.org/jira/browse/PDFBOX-3024
> Project: PDFBox
> Issue Type: Bug
> Components: Preflight
> Affects Versions: 1.8.10
> Reporter: Guillaume Monteils
> Assignee: Tilman Hausherr
> Fix For: 1.8.12
>
> Attachments: 004973.pdf, PDF-Tools.png,
> PDFBOX_3024_dont_clear_resources.patch, PDFBox.png, eclipse-1.jpg,
> eclipse-2.jpg, pdfa-1b_fonts_TT_Type0.pdf
>
>
> 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 :
> {code}
> 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)...
> {code}
> 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.
> {code}
> (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}) })
> {code}
> 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.
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