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/* Copyright (c) 2015 Stanislaw Halik
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*/
#pragma once
#include "plugin-api.hpp"
#include <memory>
#include <algorithm>
#include <cstring>
#include <QDebug>
#include <QString>
#include <QLibrary>
#include <QList>
#include <QDir>
#include <QList>
#include <QIcon>
#if defined(__APPLE__)
# define OPENTRACK_SOLIB_EXT "dylib"
#elif defined(_WIN32)
# define OPENTRACK_SOLIB_EXT "dll"
#else
# define OPENTRACK_SOLIB_EXT "so"
#endif
#ifdef _MSC_VER
# define OPENTRACK_SOLIB_PREFIX ""
#else
# define OPENTRACK_SOLIB_PREFIX "lib"
#endif
extern "C" typedef void* (*OPENTRACK_CTOR_FUNPTR)(void);
extern "C" typedef Metadata* (*OPENTRACK_METADATA_FUNPTR)(void);
struct dylib final
{
enum Type { Filter = 0xdeadbabe, Tracker = 0xcafebeef, Protocol = 0xdeadf00d, Invalid = 0xcafebabe };
dylib(const QString& filename_, Type t) :
type(Invalid),
full_filename(filename_),
module_name(trim_filename(filename_)),
Dialog(nullptr),
Constructor(nullptr),
Meta(nullptr)
{
// otherwise dlopen opens the calling executable
if (filename_.size() == 0 || module_name.size() == 0)
return;
handle.setFileName(filename_);
handle.setLoadHints(QLibrary::DeepBindHint | QLibrary::ResolveAllSymbolsHint);
if (check(!handle.load()))
return;
if (check((Dialog = (OPENTRACK_CTOR_FUNPTR) handle.resolve("GetDialog"), !Dialog)))
return;
if (check((Constructor = (OPENTRACK_CTOR_FUNPTR) handle.resolve("GetConstructor"), !Constructor)))
return;
if (check((Meta = (OPENTRACK_METADATA_FUNPTR) handle.resolve("GetMetadata"), !Meta)))
return;
auto m = std::unique_ptr<Metadata>(Meta());
icon = m->icon();
name = m->name();
type = t;
}
~dylib()
{
// QLibrary refcounts the .dll's so don't forcefully unload
}
static QList<std::shared_ptr<dylib>> enum_libraries(const QString& library_path)
{
QDir module_directory(library_path);
QList<std::shared_ptr<dylib>> ret;
static const struct filter_ {
Type type;
QString glob;
} filters[] = {
{ Filter, QStringLiteral(OPENTRACK_SOLIB_PREFIX "opentrack-filter-*." OPENTRACK_SOLIB_EXT), },
{ Tracker, QStringLiteral(OPENTRACK_SOLIB_PREFIX "opentrack-tracker-*." OPENTRACK_SOLIB_EXT), },
{ Protocol, QStringLiteral(OPENTRACK_SOLIB_PREFIX "opentrack-proto-*." OPENTRACK_SOLIB_EXT), },
};
for (const filter_& filter : filters)
{
for (const QString& filename : module_directory.entryList({ filter.glob }, QDir::Files, QDir::Name))
{
std::shared_ptr<dylib> lib = std::make_shared<dylib>(QStringLiteral("%1/%2").arg(library_path).arg(filename), filter.type);
if (lib->type == Invalid)
continue;
if (std::any_of(ret.cbegin(),
ret.cend(),
[&lib](const std::shared_ptr<dylib>& a) {
return a->type == lib->type && a->name == lib->name;
}))
{
qDebug() << "duplicate lib" << filename << "ident" << lib->name;
continue;
}
ret.push_back(lib);
}
}
return ret;
}
Type type;
QString module_name;
QString full_filename;
QIcon icon;
QString name;
OPENTRACK_CTOR_FUNPTR Dialog;
OPENTRACK_CTOR_FUNPTR Constructor;
OPENTRACK_METADATA_FUNPTR Meta;
private:
QLibrary handle;
static QString trim_filename(const QString& in_)
{
QStringRef in(&in_);
const int idx = in.lastIndexOf("/");
if (idx != -1)
{
in = in.mid(idx + 1);
if (in.startsWith(OPENTRACK_SOLIB_PREFIX) &&
in.endsWith("." OPENTRACK_SOLIB_EXT))
{
static constexpr unsigned pfx_len = sizeof(OPENTRACK_SOLIB_PREFIX) - 1;
static constexpr unsigned rst_len = sizeof("." OPENTRACK_SOLIB_EXT) - 1;
in = in.mid(pfx_len);
in = in.left(in.size() - rst_len);
static const char* names[] =
{
"opentrack-tracker-",
"opentrack-proto-",
"opentrack-filter-",
};
for (auto name : names)
{
if (in.startsWith(name))
return in.mid(std::strlen(name)).toString();
}
}
}
return QStringLiteral("");
}
bool check(bool fail)
{
if (fail)
{
qDebug() << "library" << module_name << "failed:" << handle.errorString();
if (handle.isLoaded())
(void) handle.unload();
Constructor = nullptr;
Dialog = nullptr;
Meta = nullptr;
type = Invalid;
}
return fail;
}
};
struct Modules final
{
using dylib_ptr = std::shared_ptr<dylib>;
using dylib_list = QList<dylib_ptr>;
Modules(const QString& library_path) :
module_list(dylib::enum_libraries(library_path)),
filter_modules(filter(dylib::Filter)),
tracker_modules(filter(dylib::Tracker)),
protocol_modules(filter(dylib::Protocol))
{}
dylib_list& filters() { return filter_modules; }
dylib_list& trackers() { return tracker_modules; }
dylib_list& protocols() { return protocol_modules; }
private:
dylib_list module_list;
dylib_list filter_modules;
dylib_list tracker_modules;
dylib_list protocol_modules;
static dylib_list& sorted(dylib_list& xs)
{
std::sort(xs.begin(), xs.end(), [&](const dylib_ptr& a, const dylib_ptr& b) { return a->name.toLower() < b->name.toLower(); });
return xs;
}
dylib_list filter(dylib::Type t)
{
QList<std::shared_ptr<dylib>> ret;
for (auto x : module_list)
if (x->type == t)
ret.push_back(x);
return sorted(ret);
}
};
template<typename t>
static inline std::shared_ptr<t> make_dylib_instance(const std::shared_ptr<dylib>& lib)
{
std::shared_ptr<t> ret;
if (lib != nullptr && lib->Constructor)
ret = std::shared_ptr<t>(reinterpret_cast<t*>(reinterpret_cast<OPENTRACK_CTOR_FUNPTR>(lib->Constructor)()));
return ret;
}
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