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Posted to dev@pdfbox.apache.org by "Tilman Hausherr (JIRA)" <ji...@apache.org> on 2014/08/03 15:29:11 UTC
[jira] [Updated] (PDFBOX-2158) ExtractText missing most of text in
this PDF file, due to font bounding box with minus infinity
[ https://issues.apache.org/jira/browse/PDFBOX-2158?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tilman Hausherr updated PDFBOX-2158:
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Attachment: PDFBOX-2158-077702.pdf
The attached file PDFBOX-2158-077702.pdf has "/Decode [ 1 0 ]" instead of "/Decode [ 1.0 0.0 ]" which resulted in a classcast exception, my next commit will fix that too.
> ExtractText missing most of text in this PDF file, due to font bounding 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
> Attachments: PDFBOX-2158-077702.pdf, negative.text.box.pdf
>
>
> 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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