[PDFBOX-5430] PDFStreamEngine.showTextStrings with font switch

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.26
• Fix Version/s: 2.0.27, 3.0.0 PDFBox
• Component/s: Parsing
• Assignee: Tilman Hausherr
• Reporter: Oliver Schmidtmer
• Created: 06/May/22 14:46
• Updated: 29/Sep/22 17:57
• Resolved: 07/May/22 13:13

Description

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.

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);