1 files changed, 75 insertions, 0 deletions
diff --git a/Source/WTF/wtf/cf/TypeCastsCF.h b/Source/WTF/wtf/cf/TypeCastsCF.h
new file mode 100644
index 000000000..d525894ac
--- /dev/null
+++ b/Source/WTF/wtf/cf/TypeCastsCF.h
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2014 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TypeCastsCF_h
+#define TypeCastsCF_h
+
+#include <CoreFoundation/CoreFoundation.h>
+#include <wtf/Assertions.h>
+
+namespace WTF {
+
+template <typename> struct CFTypeTrait;
+
+#define DECLARE_CF_TYPE_TRAIT(ClassName) \
+template <> \
+struct CFTypeTrait<ClassName##Ref> { \
+    static inline CFTypeID typeID() { return ClassName##GetTypeID(); } \
+};
+
+DECLARE_CF_TYPE_TRAIT(CFArray);
+DECLARE_CF_TYPE_TRAIT(CFBoolean);
+DECLARE_CF_TYPE_TRAIT(CFData);
+DECLARE_CF_TYPE_TRAIT(CFDictionary);
+DECLARE_CF_TYPE_TRAIT(CFNumber);
+DECLARE_CF_TYPE_TRAIT(CFString);
+
+#undef DECLARE_CF_TYPE_TRAIT
+
+template<typename T> T dynamic_cf_cast(CFTypeRef object)
+{
+    if (!object)
+        return nullptr;
+
+    if (CFGetTypeID(object) != CFTypeTrait<T>::typeID())
+        return nullptr;
+
+    return static_cast<T>(object);
+}
+
+template<typename T> T checked_cf_cast(CFTypeRef object)
+{
+    auto result = dynamic_cf_cast<T>(object);
+    ASSERT_WITH_SECURITY_IMPLICATION(result);
+
+    return result;
+}
+
+} // namespace WTF
+
+using WTF::checked_cf_cast;
+using WTF::dynamic_cf_cast;
+
+#endif // TypeCastsCF_h