[PDFBOX-2158] ExtractText missing most of text in this PDF file, due to font bounding box with minus infinity

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.8.5, 2.0.0
• Fix Version/s: 2.0.0
• Component/s: Parsing, Text extraction
• Environment: Windows x64
• Assignee: Tilman Hausherr
• Reporter: Joel Hirsh
• Created: 22/Jun/14 20:39
• Updated: 17/Mar/16 19:07
• Resolved: 24/Nov/15 20:22

Description

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

Issue Links

• duplicates: PDFBOX-3130 Recent regression in PDFTextStripper, text getting garbled