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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef FLUTTER_FML_NATIVE_LIBRARY_H_
#define FLUTTER_FML_NATIVE_LIBRARY_H_
#include <optional>
#include "flutter/fml/build_config.h"
#include "flutter/fml/macros.h"
#include "flutter/fml/memory/ref_counted.h"
#include "flutter/fml/memory/ref_ptr.h"
#if defined(FML_OS_WIN)
#include <windows.h>
#endif // defined(FML_OS_WIN)
namespace fml {
class NativeLibrary : public fml::RefCountedThreadSafe<NativeLibrary> {
public:
#if FML_OS_WIN
using Handle = HMODULE;
using SymbolHandle = FARPROC;
#else // FML_OS_WIN
using Handle = void*;
using SymbolHandle = void*;
#endif // FML_OS_WIN
static fml::RefPtr<NativeLibrary> Create(const char* path);
static fml::RefPtr<NativeLibrary> CreateWithHandle(
Handle handle,
bool close_handle_when_done);
static fml::RefPtr<NativeLibrary> CreateForCurrentProcess();
template <typename T>
const std::optional<T> ResolveFunction(const char* symbol) {
auto* resolved_symbol = Resolve(symbol);
if (!resolved_symbol) {
return std::nullopt;
}
return std::optional<T>(reinterpret_cast<T>(resolved_symbol));
}
const uint8_t* ResolveSymbol(const char* symbol) {
auto* resolved_symbol = reinterpret_cast<const uint8_t*>(Resolve(symbol));
if (resolved_symbol == nullptr) {
FML_DLOG(INFO) << "Could not resolve symbol in library: " << symbol;
}
return resolved_symbol;
}
private:
Handle handle_ = nullptr;
bool close_handle_ = true;
explicit NativeLibrary(const char* path);
NativeLibrary(Handle handle, bool close_handle);
~NativeLibrary();
Handle GetHandle() const;
SymbolHandle Resolve(const char* symbol) const;
FML_DISALLOW_COPY_AND_ASSIGN(NativeLibrary);
FML_FRIEND_REF_COUNTED_THREAD_SAFE(NativeLibrary);
FML_FRIEND_MAKE_REF_COUNTED(NativeLibrary);
};
} // namespace fml
#endif // FLUTTER_FML_NATIVE_LIBRARY_H_