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https://issues.apache.org/jira/browse/PDFBOX-5430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17533452#comment-17533452
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Michael Klink commented on PDFBOX-5430:
---------------------------------------
Indeed, this content stream simply is broken. As [~tilman] has shown, a number
of instructions therein have - incorrectly! - been made the contents of the
array argument of a *TJ* instruction.
Adobe Acrobat apparently ignores that the instructions are so enclosed and acts
as if there was no *\[* or *\] TJ*.
Other viewers might simply ignore (or treat as strings) everything that is
neither string nor number in the array.
In case of content that matters (as invoice content does), this might lead
completely different appearances if viewed with different viewers. Thus, PDFBox
should definitively throw an exception here and not repair it one way or the
other.
> PDFStreamEngine.showTextStrings with font switch
> ------------------------------------------------
>
> Key: PDFBOX-5430
> URL: https://issues.apache.org/jira/browse/PDFBOX-5430
> Project: PDFBox
> Issue Type: Bug
> Components: Parsing
> Affects Versions: 2.0.26
> Reporter: Oliver Schmidtmer
> Assignee: Tilman Hausherr
> Priority: Major
> Fix For: 2.0.27, 3.0.0 PDFBox
>
> Attachments: keine Vorschau ELO-1228188_20220228_11462_HD_online.pdf
>
>
> The attached PDF fails to render with an PDFStreamEngine.showTextStrings with
> the following exception:
> "java.io.IOException: Unknown type COSName in array for TJ
> operation:COSName\{F3}"
> This seems to be a font switch.
> {code:java}
> diff --git
> "a/pdfbox/src/main/java/org/apache/pdfbox/contentstream/PDFStreamEngine.java"
> "b/pdfbox/src/main/java/org/apache/pdfbox/contentstream/PDFStreamEngine.java"
> index e4f2259a5..12edadd2b 100644
> ---
> "a/pdfbox/src/main/java/org/apache/pdfbox/contentstream/PDFStreamEngine.java"
> +++
> "b/pdfbox/src/main/java/org/apache/pdfbox/contentstream/PDFStreamEngine.java"
> @@ -680,6 +680,18 @@ public abstract class PDFStreamEngine
> byte[] string = ((COSString)obj).getBytes();
> showText(string);
> }
> + else if (obj instanceof COSName)
> + {
> + if(((COSName) obj).getName().startsWith("F"))
> + {
> + textState.setFont(resources.getFont((COSName) obj));
> + }
> + else
> + {
> + throw new IOException("Unknown type " +
> obj.getClass().getSimpleName()
> + + " in array for TJ operation:" + obj);
> + }
> + }
> else if (obj instanceof COSArray)
> {
> LOG.error("Nested arrays are not allowed in an array for TJ
> operation:" + obj);
> {code}
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