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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