Fixes #163: Regression: encoding error when parsing a ISO-8859-1 xml (#164)

- Fixed code.
- Added tests.

Author: belingueres

src/main/java/org/codehaus/plexus/util/xml/pull/MXParser.java

@@ -16,6 +16,7 @@
 import java.io.UnsupportedEncodingException;
 
 import org.codehaus.plexus.util.ReaderFactory;
+import org.codehaus.plexus.util.xml.XmlReader;
 
 //import java.util.Hashtable;
 
@@ -663,7 +664,12 @@ public void setInput( Reader in )
         reset();
         reader = in;
 
-        if ( reader instanceof InputStreamReader )
+        if ( reader instanceof XmlReader ) {
+            // encoding already detected
+            XmlReader xsr = (XmlReader) reader;
+            fileEncoding = xsr.getEncoding();
+        }
+        else if ( reader instanceof InputStreamReader )
         {
             InputStreamReader isr = (InputStreamReader) reader;
             if ( isr.getEncoding() != null )

src/test/java/org/codehaus/plexus/util/xml/pull/MXParserTest.java

@@ -21,9 +21,15 @@
 import static org.junit.Assert.fail;
 
 import java.io.EOFException;
+import java.io.File;
 import java.io.IOException;
+import java.io.InputStream;
+import java.io.Reader;
 import java.io.StringReader;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 
+import org.codehaus.plexus.util.ReaderFactory;
 import org.junit.Test;
 
 /**
@@ -840,4 +846,56 @@ public void testXMLDeclVersionEncodingStandaloneNoSpace()
         }
     }
 
+    /**
+     * Issue 163: https://github.com/codehaus-plexus/plexus-utils/issues/163
+     *
+     * @throws IOException if IO error.
+     *
+     * @since 3.4.1
+     */
+    @Test
+    public void testEncodingISO_8859_1setInputReader()
+        throws IOException
+    {
+        try ( Reader reader =
+            ReaderFactory.newXmlReader( new File( "src/test/resources/xml", "test-encoding-ISO-8859-1.xml" ) ) )
+        {
+            MXParser parser = new MXParser();
+            parser.setInput( reader );
+            while ( parser.nextToken() != XmlPullParser.END_DOCUMENT )
+                ;
+            assertTrue( true );
+        }
+        catch ( XmlPullParserException e )
+        {
+            fail( "should not raise exception: " + e );
+        }
+    }
+
+    /**
+     * Issue 163: https://github.com/codehaus-plexus/plexus-utils/issues/163
+     *
+     * @throws IOException if IO error.
+     *
+     * @since 3.4.1
+     */
+    @Test
+    public void testEncodingISO_8859_1_setInputStream()
+        throws IOException
+    {
+        try ( InputStream input =
+            Files.newInputStream( Paths.get( "src/test/resources/xml", "test-encoding-ISO-8859-1.xml" ) ) )
+        {
+            MXParser parser = new MXParser();
+            parser.setInput( input, null );
+            while ( parser.nextToken() != XmlPullParser.END_DOCUMENT )
+                ;
+            assertTrue( true );
+        }
+        catch ( XmlPullParserException e )
+        {
+            fail( "should not raise exception: " + e );
+        }
+    }
+
 }