[PDFBOX-4883] COSFloat is extremely slow

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.20, 3.0.0 PDFBox
• Fix Version/s: 3.0.0 PDFBox
• Component/s: PDModel
• Labels: display optimization parsing textextraction
• Assignee: Andreas Lehmkühler
• Reporter: Alfred
• Created: 14/Jun/20 10:18
• Updated: 01/Jul/20 14:30
• Resolved: 01/Jul/20 14:30

Description

I am testing text extraction from PDF and profiling the execution.

I found that biggest time consumer is the COSFloat class.

 

All other improvements I suggested so far are small compared to this.

But this is the also the most complex one.

 

I have attached te profiler output for the same text extraction, with and without the COSFloat changes.

The time to extract the same text was 4 times long with the original COSFlow, because of its use of BigDecimal.

I will try to write extra tests for all cases I see in the original COSFLoat code, if they are not already tested.

Then I will submit for review a new COSFloat version.

 

I think this affects parsing and displaying PDFs too, not just text extraction.