[jira] [Commented] (PDFBOX-4878) Call to DictionaryEncoding.getEncoding () throws NullPointerException for some PDF's

["Tilman Hausherr (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PDFBOX-4878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17134416#comment-17134416 ] 

Tilman Hausherr commented on PDFBOX-4878:
-----------------------------------------

about "Encoding":
{quote}
An encoding dictionary whose Differences array shall specify the complete character encoding for this font (see 9.6.6, "Character Encoding").
{quote}

About "BaseEncoding":
{quote}
If this entry is absent, the *Differences* entry shall describe differences from an implicit base encoding. For a font program that is embedded in the PDF file, the implicit base encoding shall be the font program’s built-in encoding, as described in 9.6.6, "Character Encoding" and further elaborated in the sub-clauses on specific font types. Otherwise, for a nonsymbolic font, it shall be StandardEncoding, and for a symbolic font, it shall be the font’s built-in encoding.
{quote}

The second segment is confusing; but I think that the word "complete" in the first segment is to be understood that it is a "difference" from nothing, i.e. there is no base encoding.

> Call to DictionaryEncoding.getEncoding () throws NullPointerException for some PDF's
> ------------------------------------------------------------------------------------
>
>                 Key: PDFBOX-4878
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4878
>             Project: PDFBox
>          Issue Type: Bug
>          Components: PDModel
>    Affects Versions: 2.0.20
>            Reporter: Thomas Gawehn
>            Priority: Critical
>         Attachments: test.pdf
>
>
> Wenn iterating all fonts in a PDF a call to PDSimpleFont.getEncoding().getEncodingName () throws a NullPointerException inside the library code for the attached sample-PDF.
> The situation can be reproduced, when running the following loop for the attached PDF (test.pdf):
>  
>  
> {code:java}
>         PDDocument document = PDDocument.load (file);
>         int pages = document.getNumberOfPages ();
>         for (int i = 0; i < pages; ++i)
>         {
>             PDPage page = document.getPage (i);
>             PDResources resources = page.getResources ();
>             if (resources == null)
>                 continue;
>             Iterator<COSName> iter = resources.getFontNames ().iterator ();
>             while (iter.hasNext ())
>             {
>                 COSName cos = iter.next ();
>                 try
>                 {
>                     PDFont font = resources.getFont (cos);
>                     System.out.println (font.getName ());
>                     if (font instanceof PDSimpleFont)
>                     {
>                         PDSimpleFont simpleFont = (PDSimpleFont) font;
>                         Encoding encoding = simpleFont.getEncoding ();
>                         if (encoding != null)
>                         {
>                             try
>                             {
>                                 System.out.println ("* encoding="+encoding.getEncodingName ());
>                             }
>                             catch (Exception e)
>                             {
>                                 e.printStackTrace ();
>                             }
>                         }
>                     }
>                 }
>                 catch (IOException e)
>                 {
>                     e.printStackTrace ();
>                 }
>             }
>         }
>         document.close ();
> {code}
>  



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