Case insensitive doctype

core/src/main/java/com/tickaroo/tikxml/XmlReader.java

@@ -321,7 +321,8 @@ private boolean isCDATA() throws IOException {
    * @throws IOException
    */
   private boolean isDocTypeDefinition() throws IOException {
-    return buffer.rangeEquals(0, DOCTYPE_OPEN);
+    return buffer.size() >= DOCTYPE_OPEN.size() &&
+            buffer.snapshot(DOCTYPE_OPEN.size()).toAsciiUppercase().equals(DOCTYPE_OPEN);
   }
 
   /**

core/src/test/java/com/tickaroo/tikxml/XmlReaderTest.java

@@ -1028,6 +1028,30 @@ public void xmlWithDoctypes() throws IOException {
         Assert.assertFalse(reader.hasElement());
     }
 
+    @Test
+    public void xmlWithLowercaseDoctypes() throws IOException {
+
+        String xml =
+                "<!doctype rootelement SYSTEM \"file.dtd\"><root\nanAttribute=\"1\"\n attributeWithWhiteSpace=\"2\" \n   \t\tattributeWithTabs=\"20.2\">\n<child>Contains\nmulitlines\n</child>\n</root>";
+        XmlReader reader = readerFrom(xml);
+
+        reader.beginElement();
+        Assert.assertEquals("root", reader.nextElementName());
+        Assert.assertEquals("anAttribute", reader.nextAttributeName());
+        Assert.assertEquals(1, reader.nextAttributeValueAsInt());
+        Assert.assertEquals("attributeWithWhiteSpace", reader.nextAttributeName());
+        Assert.assertEquals("2", reader.nextAttributeValue());
+        Assert.assertEquals("attributeWithTabs", reader.nextAttributeName());
+        Assert.assertEquals(20.2, reader.nextAttributeValueAsDouble(), 0);
+        Assert.assertTrue(reader.hasElement());
+        reader.beginElement();
+        Assert.assertEquals("child", reader.nextElementName());
+        Assert.assertEquals("Contains\nmulitlines\n", reader.nextTextContent());
+        reader.endElement();
+        reader.endElement();
+        Assert.assertFalse(reader.hasElement());
+    }
+
     @Test
     public void notADocTypeDefinitionButSameDoctypeAsTag() throws IOException {