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/*
Minetest
Copyright (C) 2010-2013 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()
#include <cstring>
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;
};
/************************************************
* !!! W A R N I N G !!! *
* !!! A C H T U N G !!! *
* *
* This smart pointer class is NOT thread safe. *
* ONLY use in a single-threaded context! *
* *
************************************************/
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;
memset(data,0,sizeof(T)*m_size);
(*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(const 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
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