PDFBOX-6059: avoid ClassCastException

THausherr · THausherr · commit 91f264f3d799 · 2025-09-03T18:03:28.000Z
git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1928212 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pdfbox/src/main/java/org/apache/pdfbox/multipdf/PDFMergerUtility.java b/pdfbox/src/main/java/org/apache/pdfbox/multipdf/PDFMergerUtility.java
@@ -542,7 +542,7 @@ public void appendDocument(PDDocument destination, PDDocument source) throws IOE
         mergeAcroForm(cloner, destCatalog, srcCatalog);
 
         COSArray destThreads = destCatalog.getCOSObject().getCOSArray(COSName.THREADS);
-        COSArray srcThreads = (COSArray) cloner.cloneForNewDocument(destCatalog.getCOSObject().getDictionaryObject(
+        COSArray srcThreads = cloner.cloneForNewDocument(destCatalog.getCOSObject().getCOSArray(
                 COSName.THREADS));
         if (destThreads == null)
         {
@@ -649,9 +649,9 @@ public void appendDocument(PDDocument destination, PDDocument source) throws IOE
             }
             else
             {
-                destNums = (COSArray) destLabels.getDictionaryObject(COSName.NUMS);
+                destNums = destLabels.getCOSArray(COSName.NUMS);
             }
-            COSArray srcNums = (COSArray) srcLabels.getDictionaryObject(COSName.NUMS);
+            COSArray srcNums = srcLabels.getCOSArray(COSName.NUMS);
             if (srcNums != null)
             {
                 int startSize = destNums.size();

Original file line number	Diff line number	Diff line change
`@@ -542,7 +542,7 @@ public void appendDocument(PDDocument destination, PDDocument source) throws IOE`
`542`	`542`	`mergeAcroForm(cloner, destCatalog, srcCatalog);`
`543`	`543`
`544`	`544`	`COSArray destThreads = destCatalog.getCOSObject().getCOSArray(COSName.THREADS);`
`545`		`- COSArray srcThreads = (COSArray) cloner.cloneForNewDocument(destCatalog.getCOSObject().getDictionaryObject(`
	`545`	`+ COSArray srcThreads = cloner.cloneForNewDocument(destCatalog.getCOSObject().getCOSArray(`
`546`	`546`	`COSName.THREADS));`
`547`	`547`	`if (destThreads == null)`
`548`	`548`	`{`
`@@ -649,9 +649,9 @@ public void appendDocument(PDDocument destination, PDDocument source) throws IOE`
`649`	`649`	`}`
`650`	`650`	`else`
`651`	`651`	`{`
`652`		`- destNums = (COSArray) destLabels.getDictionaryObject(COSName.NUMS);`
	`652`	`+ destNums = destLabels.getCOSArray(COSName.NUMS);`
`653`	`653`	`}`
`654`		`- COSArray srcNums = (COSArray) srcLabels.getDictionaryObject(COSName.NUMS);`
	`654`	`+ COSArray srcNums = srcLabels.getCOSArray(COSName.NUMS);`
`655`	`655`	`if (srcNums != null)`
`656`	`656`	`{`
`657`	`657`	`int startSize = destNums.size();`