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/*************************************************************************
** DLLoader.hpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2022 Martin Gieseking <martin.gieseking@uos.de> **
** **
** This program is free software; you can redistribute it and/or **
** modify it under the terms of the GNU General Public License as **
** published by the Free Software Foundation; either version 3 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 General Public License for more details. **
** **
** You should have received a copy of the GNU General Public License **
** along with this program; if not, see <http://www.gnu.org/licenses/>. **
*************************************************************************/
#ifndef DLLOADER_HPP
#define DLLOADER_HPP
#include <string>
#ifdef _WIN32
#include "windows.hpp"
#else
#include <dlfcn.h>
#endif
class DLLoader {
public:
DLLoader () =delete;
explicit DLLoader (const std::string &dlname);
DLLoader (DLLoader &&loader) =default;
virtual ~DLLoader () {closeLibrary();}
bool loaded () const {return _handle != nullptr;}
bool loadLibrary (const std::string &dlname);
protected:
template <typename T> T loadSymbol (const char *name) const;
void closeLibrary ();
private:
#ifdef _WIN32
HINSTANCE _handle;
#else
void *_handle;
#endif
};
/** Loads a function or variable from the dynamic/shared library.
* @param[in] name name of function/variable to load
* @return pointer to loaded symbol, or 0 if the symbol could not be loaded */
template <typename T>
T DLLoader::loadSymbol (const char *name) const {
if (_handle) {
#ifdef _WIN32
return reinterpret_cast<T>(GetProcAddress(_handle, name));
#else
return reinterpret_cast<T>(dlsym(_handle, name));
#endif
}
return nullptr;
}
#define LOAD_SYMBOL(sym) loadSymbol<decltype(&sym)>(#sym)
#endif
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