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/*
* mptLibrary.h
* ------------
* Purpose: Shared library handling.
* Notes : (currently none)
* Authors: OpenMPT Devs
* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
*/
#pragma once
#include "openmpt/all/BuildSettings.hpp"
OPENMPT_NAMESPACE_BEGIN
namespace mpt
{
typedef void* (*FuncPtr)(); // pointer to function returning void*
class LibraryHandle;
enum class LibrarySearchPath
{
Invalid,
Default,
Application,
System,
FullPath,
};
class LibraryPath
{
private:
mpt::LibrarySearchPath searchPath;
mpt::PathString fileName;
private:
LibraryPath(mpt::LibrarySearchPath searchPath, const mpt::PathString &fileName);
public:
mpt::LibrarySearchPath GetSearchPath() const;
mpt::PathString GetFileName() const;
public:
// "lib" on Unix-like systems, "" on Windows
static mpt::PathString GetDefaultPrefix();
// ".so" or ".dylib" or ".dll"
static mpt::PathString GetDefaultSuffix();
// Returns the library path in the application directory, with os-specific prefix and suffix added to basename.
// e.g.: basename = "unmo3" --> "libunmo3.so" / "apppath/unmo3.dll"
static LibraryPath App(const mpt::PathString &basename);
// Returns the library path in the application directory, with os-specific suffix added to fullname.
// e.g.: fullname = "libunmo3" --> "libunmo3.so" / "apppath/libunmo3.dll"
static LibraryPath AppFullName(const mpt::PathString &fullname);
// Returns a system library name with os-specific prefix and suffix added to basename, but without any full path in order to be searched in the default search path.
// e.g.: basename = "unmo3" --> "libunmo3.so" / "unmo3.dll"
static LibraryPath System(const mpt::PathString &basename);
// Returns a system library name with os-specific suffix added to path.
// e.g.: path = "somepath/foo" --> "somepath/foo.so" / "somepath/foo.dll"
static LibraryPath FullPath(const mpt::PathString &path);
};
class Library
{
protected:
std::shared_ptr<LibraryHandle> m_Handle;
public:
Library();
Library(const mpt::LibraryPath &path);
public:
void Unload();
bool IsValid() const;
FuncPtr GetProcAddress(const std::string &symbol) const;
template <typename Tfunc>
bool Bind(Tfunc * & f, const std::string &symbol) const
{
#if !(MPT_OS_WINDOWS && MPT_COMPILER_GCC)
// MinGW64 std::is_function is always false for non __cdecl functions.
// See https://connect.microsoft.com/VisualStudio/feedback/details/774720/stl-is-function-bug .
static_assert(std::is_function<Tfunc>::value);
#endif
const FuncPtr addr = GetProcAddress(symbol);
f = reinterpret_cast<Tfunc*>(addr);
return (addr != nullptr);
}
};
} // namespace mpt
OPENMPT_NAMESPACE_END
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