diff -r 000000000000 -r 4f2f89ce4247 WebCore/rendering/style/ContentData.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/rendering/style/ContentData.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
+ * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "config.h"
+#include "ContentData.h"
+
+#include "CounterContent.h"
+#include "StringImpl.h"
+#include "StyleImage.h"
+
+namespace WebCore {
+
+void ContentData::clear()
+{
+    deleteContent();
+
+    ContentData* n = m_next;
+    m_next = 0;
+
+    // Reverse the list so we can delete without recursing.
+    ContentData* last = 0;
+    ContentData* c;
+    while ((c = n)) {
+        n = c->m_next;
+        c->m_next = last;
+        last = c;
+    }
+    for (c = last; c; c = n) {
+        n = c->m_next;
+        c->m_next = 0;
+        delete c;
+    }
+}
+
+bool ContentData::dataEquivalent(const ContentData& other) const
+{
+    if (type() != other.type())
+        return false;
+
+    switch (type()) {
+        case CONTENT_NONE:
+            return true;
+            break;
+        case CONTENT_TEXT:
+            return equal(text(), other.text());
+            break;
+        case CONTENT_OBJECT:
+            return StyleImage::imagesEquivalent(image(), other.image());
+            break;
+        case CONTENT_COUNTER:
+            return *counter() == *other.counter();
+            break;
+    }
+
+    ASSERT_NOT_REACHED();
+    return false;
+}
+
+void ContentData::deleteContent()
+{
+    switch (m_type) {
+        case CONTENT_NONE:
+            break;
+        case CONTENT_OBJECT:
+            m_content.m_image->deref();
+            break;
+        case CONTENT_TEXT:
+            m_content.m_text->deref();
+            break;
+        case CONTENT_COUNTER:
+            delete m_content.m_counter;
+            break;
+    }
+
+    m_type = CONTENT_NONE;
+}
+
+} // namespace WebCore