8232014: Expand DTD support

Reviewed-by: lancea, dfuchs, mschoene, rhalade, aefimov

src/java.xml/share/classes/com/sun/org/apache/xerces/internal/impl/XMLDTDScannerImpl.java

 /*
- * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2020, Oracle and/or its affiliates. All rights reserved.
  */
 /*
  * Licensed to the Apache Software Foundation (ASF) under one or more
@@ -63,7 +63,7 @@ import java.io.IOException;
  * @author Glenn Marcy, IBM
  * @author Eric Ye, IBM
  *
- * @LastModified: Nov 2017
+ * @LastModified: Feb 2020
  */
 public class XMLDTDScannerImpl
 extends XMLScanner
@@ -608,6 +608,7 @@ implements XMLDTDScanner, XMLComponent, XMLEntityHandler {
         if (fScannerState == SCANNER_STATE_END_OF_INPUT)
             return;
 
+        boolean dtdEntity = name.equals("[dtd]");
         // Handle end of PE
         boolean reportEntity = fReportEntity;
         if (name.startsWith("%")) {
@@ -616,8 +617,7 @@ implements XMLDTDScanner, XMLComponent, XMLEntityHandler {
             int startMarkUpDepth = popPEStack();
             // throw fatalError if this entity was incomplete and
             // was a freestanding decl
-            if(startMarkUpDepth == 0 &&
-            startMarkUpDepth < fMarkUpDepth) {
+            if (startMarkUpDepth == 0 && startMarkUpDepth < fMarkUpDepth) {
                 fErrorReporter.reportError(XMLMessageFormatter.XML_DOMAIN,
                 "ILL_FORMED_PARAMETER_ENTITY_WHEN_USED_IN_DECL",
                 new Object[]{ fEntityManager.fCurrentEntity.name},
@@ -637,12 +637,10 @@ implements XMLDTDScanner, XMLComponent, XMLEntityHandler {
             if (fEntityScanner.isExternal()) {
                 fExtEntityDepth--;
             }
-        }
-
-        // call handler
-        boolean dtdEntity = name.equals("[dtd]");
-        if (fDTDHandler != null && !dtdEntity && reportEntity) {
-            fDTDHandler.endParameterEntity(name, null);
+            // call handler
+            if (fDTDHandler != null && reportEntity) {
+                fDTDHandler.endParameterEntity(name, null);
+            }
         }
 
         // end DTD

src/java.xml/share/classes/com/sun/org/apache/xerces/internal/impl/XMLScanner.java

 /*
- * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2020, Oracle and/or its affiliates. All rights reserved.
  */
 /*
  * Licensed to the Apache Software Foundation (ASF) under one or more
@@ -67,7 +67,7 @@ import com.sun.xml.internal.stream.Entity;
  * @author Eric Ye, IBM
  * @author K.Venugopal SUN Microsystems
  * @author Sunitha Reddy, SUN Microsystems
- * @LastModified: Nov 2017
+ * @LastModified: Feb 2020
  */
 public abstract class XMLScanner
         implements XMLComponent {
@@ -1239,10 +1239,10 @@ public abstract class XMLScanner
      * @throws XNIException Thrown by handler to signal an error.
      */
     public void endEntity(String name, Augmentations augs) throws IOException, XNIException {
-
         // keep track of the entity depth
-        fEntityDepth--;
-
+        if (fEntityDepth > 0) {
+            fEntityDepth--;
+        }
     } // endEntity(String)
 
     /**

src/java.xml/share/classes/com/sun/org/apache/xerces/internal/impl/dtd/DTDGrammar.java

 /*
- * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2020, Oracle and/or its affiliates. All rights reserved.
  */
 /*
  * Licensed to the Apache Software Foundation (ASF) under one or more
@@ -62,7 +62,7 @@ import java.util.Random;
  * @author Andy Clark, IBM
  * @author Neil Graham, IBM
  *
- * @LastModified: Oct 2017
+ * @LastModified: Feb 2020
  */
 public class DTDGrammar
     implements XMLDTDHandler, XMLDTDContentModelHandler, EntityState, Grammar {
@@ -447,9 +447,12 @@ public class DTDGrammar
      * @throws XNIException Thrown by handler to signal an error.
      */
     public void endParameterEntity(String name, Augmentations augs) throws XNIException {
-
-        fPEDepth--;
-        fReadingExternalDTD = fPEntityStack[fPEDepth];
+        // redundant check as this method can only be called after parsing a PE
+        // incomplete or truncated DTD get caught before reaching this method
+        if (fPEDepth > 0) {
+            fPEDepth--;
+            fReadingExternalDTD = fPEntityStack[fPEDepth];
+        }
 
     } // endParameterEntity(String,Augmentations)