dynlib.h

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#pragma once
 
#include <cstdint>
#include <filesystem>
#include <span>
#include <string>
#include <string_view>
 
#include <rex/platform.h>
#include <rex/types.h>
#include <rex/utility.h>
 
namespace rex::platform {
 
enum class SymbolResolution : u8 {
  kLazy,      
  kImmediate, 
};

class REX_API DynamicLibrary : public rex::MoveOnly {
 public:
  DynamicLibrary() = default;
  ~DynamicLibrary();
 
  DynamicLibrary(DynamicLibrary&& other) noexcept;
  DynamicLibrary& operator=(DynamicLibrary&& other) noexcept;

  bool Load(const std::filesystem::path& path, SymbolResolution mode = SymbolResolution::kLazy);

  bool LoadNamed(std::string_view name, SymbolResolution mode = SymbolResolution::kLazy);

  bool Attach(const std::filesystem::path& path);

  void Close();
 
  explicit operator bool() const { return handle_ != nullptr; }

  void* GetRawSymbol(const char* name) const;

  template <typename T>
  T GetSymbol(const char* name) const {
    return reinterpret_cast<T>(GetRawSymbol(name));
  }

  const std::string& GetLastError() const { return last_error_; }
 
 private:
  void* handle_ = nullptr;
  std::string last_error_;
};
 
#if REX_PLATFORM_WIN32
REX_API std::span<const u8> FindImageSection(const void* image, std::string_view name);
#endif
 
}  // namespace rex::platform