[PDFBOX-4742] Incorrect handling of float Infinity and NaN

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.8, 2.0.18
• Fix Version/s: 2.0.19, 3.0.0 PDFBox
• Component/s: PDModel, Writing
• Assignee: Tilman Hausherr
• Reporter: Jose Novacho
• Created: 17/Jan/20 09:23
• Updated: 30/Jun/20 06:13
• Resolved: 01/Feb/20 18:38

Description

When creating document, there is an issue if the operand for a command is floating number positive or negative Infinity, or NaN.

The problem is in method org.apache.pdfbox.pdmodel.PDPageContentStream#write. In case the method org.apache.pdfbox.pdmodel.PDPageContentStream#writeOperand(float) receives as operand a floating number with value Float.POSITIVE_INFINITY or Float.NEGATIVE_INFINITY the result of formating is symbol for infinity: ∞ (unicode 0x221E). The NaN produce unicode symbol 0xFFFD (replacement character). This is then later converted to bytes using the US_ASCII encoding which produces symbol ? (0x3F) this symbol is then put into the content stream and the resulting PDF is invalid.

 

Mimimal working example to reproduce this issue.

 

public class InfiniteError {
    public static void main(String[] args) throws IOException {
        PDDocument document = new PDDocument();
        PDPage page = new PDPage();
        document.addPage(page);        
        PDFont font = PDType1Font.HELVETICA_BOLD;
        PDPageContentStream contentStream = new PDPageContentStream(document, page, PDPageContentStream.AppendMode.OVERWRITE, false);
        contentStream.beginText();
        contentStream.setFont(font, 12);
        contentStream.newLineAtOffset(100, Float.POSITIVE_INFINITY); // incorrect value 
        contentStream.showText("Hello World");
        contentStream.endText();
        contentStream.close();
        document.save("Hello World.pdf");
        document.close();
    }
}