[jira] [Created] (PDFBOX-2158) ExtractText missing most of text in this PDF file, due to font bonding box with minus infinity

["Joel Hirsh (JIRA)" <ji...@apache.org>]

Joel Hirsh created PDFBOX-2158:
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             Summary: ExtractText missing most of text in this PDF file, due to font bonding box with minus infinity
                 Key: PDFBOX-2158
                 URL: https://issues.apache.org/jira/browse/PDFBOX-2158
             Project: PDFBox
          Issue Type: Bug
          Components: Text extraction
    Affects Versions: 1.8.5
         Environment: Windows x64
            Reporter: Joel Hirsh


Attached PDF file is missing most of the text when processed by the ExtractText example program

I traced it down to PDFontDescriptorDictionary.getFontBoundingBox() getting a rectange for COSName.FONT_BBOX  that contained a ymin value of minus infinity. That method then creates a PDRectangle which calculates a bounding box with a ymin value of -65,329, and results in an enormous text size, and things go downhill from there.  The text cannot be matched up, and most of it ends up being discarded.

I was able to hack a fix by doing a check in the constructor PDRectangle.PDRectangle( COSArray array ) for big negative numbers and setting them to 0.  With that change, all the text came through as expected. However, I don't have enough familiarity with the code to understand what a real fix ought to look like.

The PDF file looks to be fine by other programs such as Acrobat and NitroPDF



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