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/*
Mod Organizer archive handling
Copyright (C) 2020 MO2 Team. All rights reserved.
This library 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 3 of the License, or (at your option) any later version.
This library 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 library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef ARCHIVE_LIBRARY_H
#define ARCHIVE_LIBRARY_H
#ifdef _WIN32
#include <Windows.h>
#else
#include <Common/MyWindows.h>
#include <cstdlib>
#include <dlfcn.h>
#include <string>
#include <unistd.h>
#include <vector>
#endif
/**
* Very small wrapper around shared libraries (DLL on Windows, .so on Linux).
*/
class ALibrary
{
public:
#ifdef _WIN32
ALibrary(const char* path) : m_Module{nullptr}, m_LastError{ERROR_SUCCESS}
{
m_Module = LoadLibraryA(path);
if (m_Module == nullptr) {
updateLastError();
}
}
~ALibrary()
{
if (m_Module) {
FreeLibrary(m_Module);
}
}
template <class T>
T resolve(const char* procName)
{
if (!m_Module) {
return nullptr;
}
auto proc = GetProcAddress(m_Module, procName);
if (!proc) {
updateLastError();
return nullptr;
}
return reinterpret_cast<T>(proc);
}
DWORD getLastError() const { return m_LastError; }
bool isOpen() const { return m_Module != nullptr; }
operator bool() const { return isOpen(); }
private:
void updateLastError() { m_LastError = ::GetLastError(); }
HMODULE m_Module;
DWORD m_LastError;
#else // Linux
ALibrary(const char* path) : m_Handle{nullptr}, m_LastError{0}
{
// Find the directory containing our own executable
std::string exeDir;
char selfPath[4096];
ssize_t len = readlink("/proc/self/exe", selfPath, sizeof(selfPath) - 1);
if (len > 0) {
selfPath[len] = '\0';
exeDir = std::string(selfPath);
auto slash = exeDir.rfind('/');
if (slash != std::string::npos)
exeDir = exeDir.substr(0, slash);
}
// Honor MO2_LIBS_DIR (set by the fluorine-manager launcher) first.
std::string envLibs;
const char* envVal = std::getenv("MO2_LIBS_DIR");
if (envVal && envVal[0] != '\0') {
envLibs = envVal;
}
// Try bundled 7z.so locations first (env override, exe dir, lib/ subdir)
std::vector<std::string> tryPaths;
if (!envLibs.empty()) {
tryPaths.push_back(envLibs + "/7z.so");
}
tryPaths.push_back(exeDir + "/7z.so");
tryPaths.push_back(exeDir + "/lib/7z.so");
tryPaths.push_back("7z.so");
tryPaths.push_back("lib/7z.so");
tryPaths.push_back("/usr/lib/p7zip/7z.so");
tryPaths.push_back("/usr/lib64/p7zip/7z.so");
tryPaths.push_back("/usr/libexec/p7zip/7z.so");
for (const auto& tryPath : tryPaths) {
m_Handle = dlopen(tryPath.c_str(), RTLD_LAZY);
if (m_Handle) break;
}
if (!m_Handle) {
// Last resort: try the original path as-is
m_Handle = dlopen(path, RTLD_LAZY);
}
if (!m_Handle) {
m_LastError = 1;
}
}
~ALibrary()
{
if (m_Handle) {
dlclose(m_Handle);
}
}
template <class T>
T resolve(const char* procName)
{
if (!m_Handle) {
return nullptr;
}
void* sym = dlsym(m_Handle, procName);
if (!sym) {
m_LastError = 1;
return nullptr;
}
return reinterpret_cast<T>(sym);
}
DWORD getLastError() const { return m_LastError; }
bool isOpen() const { return m_Handle != nullptr; }
operator bool() const { return isOpen(); }
private:
void* m_Handle;
DWORD m_LastError;
#endif
};
#endif
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