PDFBOX-6009: drop OBJR and MCR dictionaries if no /Pg entry in itself or in parent

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1925783 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

pdfbox/src/main/java/org/apache/pdfbox/multipdf/Splitter.java

@@ -441,6 +441,15 @@ private COSBase createDictionaryClone(COSBase src, COSBase dstParent, COSDiction
                 }
             }
 
+            // special handling for MCR items ("marked-content reference dictionary")
+            COSName type = srcDict.getCOSName(COSName.TYPE);
+            if (COSName.MCR.equals(type) && dstPageDict == null && 
+                dstParent instanceof COSDictionary && ((COSDictionary) dstParent).getCOSDictionary(COSName.PG) == null)
+            {
+                // PAC: Pg entry of marked-content reference and of parent structure is null
+                return null;
+            }
+
             // Create and fill clone
             dstDict = new COSDictionary();
             structDictMap.put(srcDict, dstDict);
@@ -457,7 +466,6 @@ private COSBase createDictionaryClone(COSBase src, COSBase dstParent, COSDiction
 
             // special handling for OBJR items ("object reference dictionary")
             // see e.g. file 488300.pdf and Root/StructTreeRoot/K/K/[2]/K/[1]/K/[0]/Obj
-            COSName type = srcDict.getCOSName(COSName.TYPE);
             if (COSName.OBJR.equals(type))
             {
                 COSDictionary srcObj = srcDict.getCOSDictionary(COSName.OBJ);
@@ -475,6 +483,12 @@ else if (srcObj != null) // 079177.pdf
                 {
                     return null;
                 }
+                if (dstPageDict == null &&
+                    dstParent instanceof COSDictionary && ((COSDictionary) dstParent).getCOSDictionary(COSName.PG) == null)
+                {
+                    // Pg entry of object reference dictionary and of parent structure is null
+                    return null;
+                }
             }
             else
             {