mirror of https://github.com/PCSX2/pcsx2.git
86 lines
3.2 KiB
C
86 lines
3.2 KiB
C
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/* PCSX2 - PS2 Emulator for PCs
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* Copyright (C) 2002-2022 PCSX2 Dev Team
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*
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* PCSX2 is free software: you can redistribute it and/or modify it under the terms
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* of the GNU Lesser General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with PCSX2.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <string>
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namespace Common
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{
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/**
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* Provides a platform-independent interface for loading a dynamic library and retrieving symbols.
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* The interface maintains an internal reference count to allow one handle to be shared between
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* multiple users.
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*/
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class DynamicLibrary final
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{
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public:
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/// Default constructor, does not load a library.
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DynamicLibrary();
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/// Automatically loads the specified library. Call IsOpen() to check validity before use.
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DynamicLibrary(const char* filename);
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/// Move constructor, transfers ownership.
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DynamicLibrary(DynamicLibrary&& move);
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/// Closes the library.
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~DynamicLibrary();
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/// Returns the specified library name with the platform-specific suffix added.
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static std::string GetUnprefixedFilename(const char* filename);
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/// Returns the specified library name in platform-specific format.
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/// Major/minor versions will not be included if set to -1.
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/// If libname already contains the "lib" prefix, it will not be added again.
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/// Windows: LIBNAME-MAJOR-MINOR.dll
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/// Linux: libLIBNAME.so.MAJOR.MINOR
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/// Mac: libLIBNAME.MAJOR.MINOR.dylib
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static std::string GetVersionedFilename(const char* libname, int major = -1, int minor = -1);
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/// Returns true if a module is loaded, otherwise false.
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bool IsOpen() const { return m_handle != nullptr; }
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/// Loads (or replaces) the handle with the specified library file name.
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/// Returns true if the library was loaded and can be used.
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bool Open(const char* filename);
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/// Unloads the library, any function pointers from this library are no longer valid.
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void Close();
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/// Returns the address of the specified symbol (function or variable) as an untyped pointer.
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/// If the specified symbol does not exist in this library, nullptr is returned.
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void* GetSymbolAddress(const char* name) const;
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/// Obtains the address of the specified symbol, automatically casting to the correct type.
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/// Returns true if the symbol was found and assigned, otherwise false.
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template <typename T>
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bool GetSymbol(const char* name, T* ptr) const
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{
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*ptr = reinterpret_cast<T>(GetSymbolAddress(name));
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return *ptr != nullptr;
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}
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/// Move assignment, transfer ownership.
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DynamicLibrary& operator=(DynamicLibrary&& move);
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private:
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DynamicLibrary(const DynamicLibrary&) = delete;
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DynamicLibrary& operator=(const DynamicLibrary&) = delete;
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/// Platform-dependent data type representing a dynamic library handle.
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void* m_handle = nullptr;
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};
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} // namespace Common
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