Add original TrueCrypt 7.1a sources

src/Platform/SharedPtr.h

@@ -0,0 +1,162 @@
+/*
+ Copyright (c) 2008 TrueCrypt Developers Association. All rights reserved.
+
+ Governed by the TrueCrypt License 3.0 the full text of which is contained in
+ the file License.txt included in TrueCrypt binary and source code distribution
+ packages.
+*/
+
+#ifndef TC_HEADER_Platform_SharedPtr
+#define TC_HEADER_Platform_SharedPtr
+
+#include <stdexcept>
+#include "SharedVal.h"
+
+#ifdef nullptr
+
+namespace TrueCrypt
+{
+	template <class T>
+	class SharedPtr 
+	{
+	public:
+		explicit SharedPtr ()
+			: Pointer (nullptr), UseCount (nullptr) { }
+
+		explicit SharedPtr (T *pointer)
+			: Pointer (pointer), UseCount (new SharedVal <uint64> (1)) { }
+
+		SharedPtr (const SharedPtr &source)
+		{
+			CopyFrom (source);
+		}
+
+		~SharedPtr ()
+		{
+			Release();
+		}
+
+		SharedPtr &operator= (const SharedPtr &source)
+		{
+			if (&source == this)
+				return *this;
+
+			Release();
+			CopyFrom (source);
+			return *this;
+		}
+
+		bool operator == (const SharedPtr &other)
+		{
+			return get() == other.get();
+		}
+
+		bool operator != (const SharedPtr &other)
+		{
+			return get() != other.get();
+		}
+
+		T &operator* () const
+		{
+#ifdef DEBUG
+			if (Pointer == nullptr)
+				throw std::runtime_error (SRC_POS);
+#endif
+			return *Pointer;
+		}
+
+		T *operator-> () const
+		{
+#ifdef DEBUG
+			if (Pointer == nullptr)
+				throw std::runtime_error (SRC_POS);
+#endif
+			return Pointer;
+		}
+
+		operator bool () const
+		{
+			return Pointer != nullptr;
+		}
+
+		T *get () const
+		{
+			return Pointer;
+		}
+
+		void reset ()
+		{
+			Release();
+		}
+
+		void reset (T *pointer)
+		{
+			*this = SharedPtr (pointer);
+		}
+
+		uint64 use_count () const
+		{
+			if (!UseCount)
+				return 0;
+
+			return *UseCount;
+		}
+
+	protected:
+		void CopyFrom (const SharedPtr &source)
+		{
+			Pointer = source.Pointer;
+			UseCount = source.UseCount;
+			
+			if (UseCount)
+				UseCount->Increment();
+		}
+
+		void Release ()
+		{
+			if (UseCount != nullptr)
+			{
+				if (UseCount->Decrement() == 0)
+				{
+					if (Pointer != nullptr)
+						delete Pointer;
+					delete UseCount;
+				}
+
+				Pointer = nullptr;
+				UseCount = nullptr;
+			}
+		}
+
+		T *Pointer;
+		SharedVal <uint64> *UseCount;
+	};
+
+#ifdef shared_ptr
+#undef shared_ptr
+#endif
+#define shared_ptr TrueCrypt::SharedPtr
+
+#ifdef make_shared
+#undef make_shared
+#endif
+
+	template <class T> shared_ptr <T> make_shared ()
+	{
+		return shared_ptr <T> (new T ());
+	}
+
+	template <class T, class A> shared_ptr <T> make_shared (const A &arg)
+	{
+		return shared_ptr <T> (new T (arg));
+	}
+
+#define make_shared TrueCrypt::make_shared
+
+}
+
+#endif // nullptr
+
+#define make_shared_auto(typeName,instanceName) shared_ptr <typeName> instanceName (new typeName ())
+
+#endif // TC_HEADER_Platform_SharedPtr