obs-StreamFX/source/util/util-library.cpp
2021-06-17 13:48:29 +02:00

107 lines
3.5 KiB
C++

// Copyright (c) 2020 Michael Fabian Dirks <info@xaymar.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
#include "util-library.hpp"
#include <unordered_map>
#include "util-platform.hpp"
#if defined(_WIN32) || defined(_WIN64) || defined(__CYGWIN__) // Windows
#define ST_WINDOWS
#else
#define ST_UNIX
#endif
#if defined(ST_WINDOWS)
#include <Windows.h>
#elif defined(ST_UNIX)
#include <dlfcn.h>
#endif
streamfx::util::library::library(std::filesystem::path file) : _library(nullptr)
{
#if defined(ST_WINDOWS)
SetLastError(ERROR_SUCCESS);
file = ::streamfx::util::platform::utf8_to_native(file);
_library = reinterpret_cast<void*>(LoadLibraryW(file.wstring().c_str()));
if (!_library) {
DWORD error = GetLastError();
if (error != ERROR_PROC_NOT_FOUND) {
PSTR message = NULL;
std::string ex = "Failed to load library.";
FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_ALLOCATE_BUFFER,
NULL, error, MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US), (LPSTR)&message, 0, NULL);
if (message) {
ex = message;
LocalFree(message);
throw std::runtime_error(ex);
}
}
throw std::runtime_error("Failed to load library.");
}
#elif defined(ST_UNIX)
_library = dlopen(file.u8string().c_str(), RTLD_LAZY);
if (!_library) {
if (char* error = dlerror(); error)
throw std::runtime_error(error);
else
throw std::runtime_error("Failed to load library.");
}
#endif
}
streamfx::util::library::~library()
{
#if defined(ST_WINDOWS)
FreeLibrary(reinterpret_cast<HMODULE>(_library));
#elif defined(ST_UNIX)
dlclose(_library);
#endif
}
void* streamfx::util::library::load_symbol(std::string_view name)
{
#if defined(ST_WINDOWS)
return reinterpret_cast<void*>(GetProcAddress(reinterpret_cast<HMODULE>(_library), name.data()));
#elif defined(ST_UNIX)
return reinterpret_cast<void*>(dlsym(_library, name.data()));
#endif
}
static std::unordered_map<std::string, std::weak_ptr<::streamfx::util::library>> libraries;
std::shared_ptr<::streamfx::util::library> streamfx::util::library::load(std::filesystem::path file)
{
auto kv = libraries.find(file.u8string());
if (kv != libraries.end()) {
if (auto ptr = kv->second.lock(); ptr)
return ptr;
libraries.erase(kv);
}
auto ptr = std::make_shared<::streamfx::util::library>(file);
libraries.emplace(file.u8string(), ptr);
return ptr;
}
std::shared_ptr<::streamfx::util::library> streamfx::util::library::load(std::string_view name)
{
return load(std::filesystem::u8path(name));
}