Initially split utility.h to multiple files in util/

src/util/pointer.h

@@ -0,0 +1,298 @@
+/*
+Minetest-c55
+Copyright (C) 2010-2012 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#ifndef UTIL_POINTER_HEADER
+#define UTIL_POINTER_HEADER
+
+#include "../irrlichttypes.h"
+#include "../debug.h" // For assert()
+
+template <typename T>
+class SharedPtr
+{
+public:
+	SharedPtr(T *t=NULL)
+	{
+		refcount = new int;
+		*refcount = 1;
+		ptr = t;
+	}
+	SharedPtr(SharedPtr<T> &t)
+	{
+		//*this = t;
+		drop();
+		refcount = t.refcount;
+		(*refcount)++;
+		ptr = t.ptr;
+	}
+	~SharedPtr()
+	{
+		drop();
+	}
+	SharedPtr<T> & operator=(T *t)
+	{
+		drop();
+		refcount = new int;
+		*refcount = 1;
+		ptr = t;
+		return *this;
+	}
+	SharedPtr<T> & operator=(SharedPtr<T> &t)
+	{
+		drop();
+		refcount = t.refcount;
+		(*refcount)++;
+		ptr = t.ptr;
+		return *this;
+	}
+	T* operator->()
+	{
+		return ptr;
+	}
+	T & operator*()
+	{
+		return *ptr;
+	}
+	bool operator!=(T *t)
+	{
+		return ptr != t;
+	}
+	bool operator==(T *t)
+	{
+		return ptr == t;
+	}
+	T & operator[](unsigned int i)
+	{
+		return ptr[i];
+	}
+private:
+	void drop()
+	{
+		assert((*refcount) > 0);
+		(*refcount)--;
+		if(*refcount == 0)
+		{
+			delete refcount;
+			if(ptr != NULL)
+				delete ptr;
+		}
+	}
+	T *ptr;
+	int *refcount;
+};
+
+template <typename T>
+class Buffer
+{
+public:
+	Buffer()
+	{
+		m_size = 0;
+		data = NULL;
+	}
+	Buffer(unsigned int size)
+	{
+		m_size = size;
+		if(size != 0)
+			data = new T[size];
+		else
+			data = NULL;
+	}
+	Buffer(const Buffer &buffer)
+	{
+		m_size = buffer.m_size;
+		if(m_size != 0)
+		{
+			data = new T[buffer.m_size];
+			memcpy(data, buffer.data, buffer.m_size);
+		}
+		else
+			data = NULL;
+	}
+	Buffer(const T *t, unsigned int size)
+	{
+		m_size = size;
+		if(size != 0)
+		{
+			data = new T[size];
+			memcpy(data, t, size);
+		}
+		else
+			data = NULL;
+	}
+	~Buffer()
+	{
+		drop();
+	}
+	Buffer& operator=(const Buffer &buffer)
+	{
+		if(this == &buffer)
+			return *this;
+		drop();
+		m_size = buffer.m_size;
+		if(m_size != 0)
+		{
+			data = new T[buffer.m_size];
+			memcpy(data, buffer.data, buffer.m_size);
+		}
+		else
+			data = NULL;
+		return *this;
+	}
+	T & operator[](unsigned int i) const
+	{
+		return data[i];
+	}
+	T * operator*() const
+	{
+		return data;
+	}
+	unsigned int getSize() const
+	{
+		return m_size;
+	}
+private:
+	void drop()
+	{
+		if(data)
+			delete[] data;
+	}
+	T *data;
+	unsigned int m_size;
+};
+
+template <typename T>
+class SharedBuffer
+{
+public:
+	SharedBuffer()
+	{
+		m_size = 0;
+		data = NULL;
+		refcount = new unsigned int;
+		(*refcount) = 1;
+	}
+	SharedBuffer(unsigned int size)
+	{
+		m_size = size;
+		if(m_size != 0)
+			data = new T[m_size];
+		else
+			data = NULL;
+		refcount = new unsigned int;
+		(*refcount) = 1;
+	}
+	SharedBuffer(const SharedBuffer &buffer)
+	{
+		//std::cout<<"SharedBuffer(const SharedBuffer &buffer)"<<std::endl;
+		m_size = buffer.m_size;
+		data = buffer.data;
+		refcount = buffer.refcount;
+		(*refcount)++;
+	}
+	SharedBuffer & operator=(const SharedBuffer & buffer)
+	{
+		//std::cout<<"SharedBuffer & operator=(const SharedBuffer & buffer)"<<std::endl;
+		if(this == &buffer)
+			return *this;
+		drop();
+		m_size = buffer.m_size;
+		data = buffer.data;
+		refcount = buffer.refcount;
+		(*refcount)++;
+		return *this;
+	}
+	/*
+		Copies whole buffer
+	*/
+	SharedBuffer(T *t, unsigned int size)
+	{
+		m_size = size;
+		if(m_size != 0)
+		{
+			data = new T[m_size];
+			memcpy(data, t, m_size);
+		}
+		else
+			data = NULL;
+		refcount = new unsigned int;
+		(*refcount) = 1;
+	}
+	/*
+		Copies whole buffer
+	*/
+	SharedBuffer(const Buffer<T> &buffer)
+	{
+		m_size = buffer.getSize();
+		if(m_size != 0)
+		{
+			data = new T[m_size];
+			memcpy(data, *buffer, buffer.getSize());
+		}
+		else
+			data = NULL;
+		refcount = new unsigned int;
+		(*refcount) = 1;
+	}
+	~SharedBuffer()
+	{
+		drop();
+	}
+	T & operator[](unsigned int i) const
+	{
+		//assert(i < m_size)
+		return data[i];
+	}
+	T * operator*() const
+	{
+		return data;
+	}
+	unsigned int getSize() const
+	{
+		return m_size;
+	}
+	operator Buffer<T>() const
+	{
+		return Buffer<T>(data, m_size);
+	}
+private:
+	void drop()
+	{
+		assert((*refcount) > 0);
+		(*refcount)--;
+		if(*refcount == 0)
+		{
+			if(data)
+				delete[] data;
+			delete refcount;
+		}
+	}
+	T *data;
+	unsigned int m_size;
+	unsigned int *refcount;
+};
+
+inline SharedBuffer<u8> SharedBufferFromString(const char *string)
+{
+	SharedBuffer<u8> b((u8*)string, strlen(string)+1);
+	return b;
+}
+
+#endif
+