[PDFBOX-3589] Double negative float

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.0.3
• Fix Version/s: 2.0.4, 3.0.0 PDFBox
• Component/s: Parsing
• Environment: Latest 2.0.x checked out the 22nd of November
• Assignee: Tilman Hausherr
• Reporter: Andrea Vacondio
• Created: 22/Nov/16 17:47
• Updated: 25/Mar/17 18:13
• Resolved: 29/Nov/16 17:45

Description

We have a document where the content stream contains a float with double negative so something like --242.0 and this result in a wrong operator:

  0 -242.0 72.08 TD

while it should be

-242.0 72.08 TD

Compared to Acrobat Reader or pdf.js, this results in missing text when rendering the page. Here is a relevant section in pdf.js source code:

 if (ch === 0x2D) { // '-'
        sign = -1;
        ch = this.nextChar();

        if (ch === 0x2D) { // '-'
          // Ignore double negative (this is consistent with Adobe Reader).
          ch = this.nextChar();
        }
}