[core] Align behavior of getParserFor(InputStream) and getParserFor(Reader)

Reported-by: Ingo Bauersachs <ingo@jitsi.org>

smack-core/src/main/java/org/jivesoftware/smack/util/PacketParserUtils.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2003-2007 Jive Software, 2019 Florian Schmaus.
+ * Copyright 2003-2007 Jive Software, 2019-2021 Florian Schmaus.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -76,9 +76,9 @@ public class PacketParserUtils {
         return getParserFor(new StringReader(stanza));
     }
 
-    public static XmlPullParser getParserFor(InputStream inputStream) throws XmlPullParserException {
+    public static XmlPullParser getParserFor(InputStream inputStream) throws XmlPullParserException, IOException {
         InputStreamReader inputStreamReader = new InputStreamReader(inputStream, StandardCharsets.UTF_8);
-        return SmackXmlParser.newXmlParser(inputStreamReader);
+        return getParserFor(inputStreamReader);
     }
 
     public static XmlPullParser getParserFor(Reader reader) throws XmlPullParserException, IOException {

smack-extensions/src/test/java/org/jivesoftware/smackx/amp/AMPExtensionTest.java

@@ -67,7 +67,6 @@ public class AMPExtensionTest {
         AMPExtensionProvider ampProvider = new AMPExtensionProvider();
         XmlPullParser parser = PacketParserUtils.getParserFor(INCORRECT_RECEIVING_STANZA_STREAM);
 
-        assertEquals(XmlPullParser.Event.START_ELEMENT, parser.next());
         assertEquals(AMPExtension.ELEMENT, parser.getName());
 
         ExtensionElement extension = ampProvider.parse(parser);
@@ -85,7 +84,6 @@ public class AMPExtensionTest {
         AMPExtensionProvider ampProvider = new AMPExtensionProvider();
         XmlPullParser parser = PacketParserUtils.getParserFor(CORRECT_SENDING_STANZA_STREAM);
 
-        assertEquals(XmlPullParser.Event.START_ELEMENT, parser.next());
         assertEquals(AMPExtension.ELEMENT, parser.getName());
         ExtensionElement extension = ampProvider.parse(parser);
         assertTrue(extension instanceof AMPExtension);

smack-extensions/src/test/java/org/jivesoftware/smackx/xhtmlim/provider/XHTMLExtensionProviderTest.java

@@ -39,7 +39,6 @@ public class XHTMLExtensionProviderTest {
     public void parsesWell() throws IOException, XmlPullParserException {
         InputStream inputStream = getClass().getResourceAsStream(XHTML_EXTENSION_SAMPLE_RESOURCE_NAME);
         XmlPullParser parser = PacketParserUtils.getParserFor(inputStream);
-        parser.next();
 
         XHTMLExtensionProvider provider = new XHTMLExtensionProvider();
         ExtensionElement extension = provider.parse(parser, parser.getDepth(), null);