1 files changed, 245 insertions, 0 deletions
diff --git a/Source/WebCore/platform/win/COMPtr.h b/Source/WebCore/platform/win/COMPtr.h
new file mode 100644
index 000000000..e595edf9f
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+++ b/Source/WebCore/platform/win/COMPtr.h
@@ -0,0 +1,245 @@
+/*
+ * Copyright (C) 2007, 2010 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. ``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
+ * 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 COMPtr_h
+#define COMPtr_h
+
+#ifndef NOMINMAX
+#define NOMINMAX
+#endif
+
+#include <unknwn.h>
+#include <wtf/Assertions.h>
+#include <wtf/HashTraits.h>
+
+#ifdef __midl
+typedef LONG HRESULT;
+#else
+typedef _Return_type_success_(return >= 0) long HRESULT;
+#endif // __midl
+
+// FIXME: Should we put this into the WebCore namespace and use "using" on it
+// as we do with things in WTF? 
+
+enum AdoptCOMTag { AdoptCOM };
+enum QueryTag { Query };
+enum CreateTag { Create };
+
+template<typename T> class COMPtr {
+public:
+    typedef T* PtrType;
+    COMPtr() : m_ptr(0) { }
+    COMPtr(T* ptr) : m_ptr(ptr) { if (m_ptr) m_ptr->AddRef(); }
+    COMPtr(AdoptCOMTag, T* ptr) : m_ptr(ptr) { }
+    COMPtr(const COMPtr& o) : m_ptr(o.m_ptr) { if (T* ptr = m_ptr) ptr->AddRef(); }
+
+    COMPtr(QueryTag, IUnknown* ptr) : m_ptr(copyQueryInterfaceRef(ptr)) { }
+    template<typename U> COMPtr(QueryTag, const COMPtr<U>& ptr) : m_ptr(copyQueryInterfaceRef(ptr.get())) { }
+
+    COMPtr(CreateTag, const IID& clsid) : m_ptr(createInstance(clsid)) { }
+
+    // Hash table deleted values, which are only constructed and never copied or destroyed.
+    COMPtr(WTF::HashTableDeletedValueType) : m_ptr(hashTableDeletedValue()) { }
+    bool isHashTableDeletedValue() const { return m_ptr == hashTableDeletedValue(); }
+
+    ~COMPtr() { if (m_ptr) m_ptr->Release(); }
+
+    T* get() const { return m_ptr; }
+
+    void clear();
+    T* leakRef();
+
+    T& operator*() const { return *m_ptr; }
+    T* operator->() const { return m_ptr; }
+
+    T** operator&() { ASSERT(!m_ptr); return &m_ptr; }
+
+    bool operator!() const { return !m_ptr; }
+    
+    // This conversion operator allows implicit conversion to bool but not to other integer types.
+    typedef T* (COMPtr::*UnspecifiedBoolType)() const;
+    operator UnspecifiedBoolType() const { return m_ptr ? &COMPtr::get : 0; }
+
+    COMPtr& operator=(const COMPtr&);
+    COMPtr& operator=(T*);
+    template<typename U> COMPtr& operator=(const COMPtr<U>&);
+
+    void query(IUnknown* ptr) { adoptRef(copyQueryInterfaceRef(ptr)); }
+    template<typename U> void query(const COMPtr<U>& ptr) { query(ptr.get()); }
+
+    void create(const IID& clsid) { adoptRef(createInstance(clsid)); }
+
+    template<typename U> HRESULT copyRefTo(U**);
+    void adoptRef(T*);
+
+private:
+    static T* copyQueryInterfaceRef(IUnknown*);
+    static T* createInstance(const IID& clsid);
+    static T* hashTableDeletedValue() { return reinterpret_cast<T*>(-1); }
+
+    T* m_ptr;
+};
+
+template<typename T> inline COMPtr<T> adoptCOM(T *ptr)
+{
+    return COMPtr<T>(AdoptCOM, ptr);
+}
+
+template<typename T> inline void COMPtr<T>::clear()
+{
+    if (T* ptr = m_ptr) {
+        m_ptr = 0;
+        ptr->Release();
+    }
+}
+
+template<typename T> inline T* COMPtr<T>::leakRef()
+{
+    T* ptr = m_ptr;
+    m_ptr = 0;
+    return ptr;
+}
+
+template<typename T> inline T* COMPtr<T>::createInstance(const IID& clsid)
+{
+    T* result;
+    if (FAILED(CoCreateInstance(clsid, 0, CLSCTX_ALL, __uuidof(result), reinterpret_cast<void**>(&result))))
+        return 0;
+    return result;
+}
+
+template<typename T> inline T* COMPtr<T>::copyQueryInterfaceRef(IUnknown* ptr)
+{
+    if (!ptr)
+        return 0;
+    T* result;
+    if (FAILED(ptr->QueryInterface(&result)))
+        return 0;
+    return result;
+}
+
+template<typename T> template<typename U> inline HRESULT COMPtr<T>::copyRefTo(U** ptr)
+{
+    if (!ptr)
+        return E_POINTER;
+    *ptr = m_ptr;
+    if (m_ptr)
+        m_ptr->AddRef();
+    return S_OK;
+}
+
+template<typename T> inline void COMPtr<T>::adoptRef(T *ptr)
+{
+    if (m_ptr)
+        m_ptr->Release();
+    m_ptr = ptr;
+}
+
+template<typename T> inline COMPtr<T>& COMPtr<T>::operator=(const COMPtr<T>& o)
+{
+    T* optr = o.get();
+    if (optr)
+        optr->AddRef();
+    T* ptr = m_ptr;
+    m_ptr = optr;
+    if (ptr)
+        ptr->Release();
+    return *this;
+}
+
+template<typename T> template<typename U> inline COMPtr<T>& COMPtr<T>::operator=(const COMPtr<U>& o)
+{
+    T* optr = o.get();
+    if (optr)
+        optr->AddRef();
+    T* ptr = m_ptr;
+    m_ptr = optr;
+    if (ptr)
+        ptr->Release();
+    return *this;
+}
+
+template<typename T> inline COMPtr<T>& COMPtr<T>::operator=(T* optr)
+{
+    if (optr)
+        optr->AddRef();
+    T* ptr = m_ptr;
+    m_ptr = optr;
+    if (ptr)
+        ptr->Release();
+    return *this;
+}
+
+template<typename T, typename U> inline bool operator==(const COMPtr<T>& a, const COMPtr<U>& b)
+{
+    return a.get() == b.get();
+}
+
+template<typename T, typename U> inline bool operator==(const COMPtr<T>& a, U* b)
+{
+    return a.get() == b;
+}
+
+template<typename T, typename U> inline bool operator==(T* a, const COMPtr<U>& b) 
+{
+    return a == b.get();
+}
+
+template<typename T, typename U> inline bool operator!=(const COMPtr<T>& a, const COMPtr<U>& b)
+{
+    return a.get() != b.get();
+}
+
+template<typename T, typename U> inline bool operator!=(const COMPtr<T>& a, U* b)
+{
+    return a.get() != b;
+}
+
+template<typename T, typename U> inline bool operator!=(T* a, const COMPtr<U>& b)
+{
+    return a != b.get();
+}
+
+namespace WTF {
+
+template<typename P> struct IsSmartPtr<COMPtr<P>> {
+    static const bool value = true;
+};
+
+template<typename P> struct HashTraits<COMPtr<P> > : SimpleClassHashTraits<COMPtr<P>> {
+    static P* emptyValue() { return nullptr; }
+
+    typedef P* PeekType;
+    static PeekType peek(const COMPtr<P>& value) { return value.get(); }
+    static PeekType peek(P* value) { return value; }
+};
+
+template<typename P> struct DefaultHash<COMPtr<P>> {
+    typedef PtrHash<COMPtr<P>> Hash;
+};
+
+}
+
+#endif