lnx/FileMapper.h

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#pragma once
#include <cstddef>
#include <misc/gen/IFileMapper.h>
#include <misc/global.h>
#include <misc/lnx/File.h>
 
namespace sf::lnx
{
 
class _MISC_CLASS FileMapper : public IFileMapper
{
  public:
    FileMapper();
 
    explicit FileMapper(const std::string& filepath, size_t ofs = 0, size_t sz = 0);
 
    void initialize() override;
 
    ~FileMapper() override;
 
    void initialize(const std::string& filepath, size_t ofs = 0, size_t sz = 0);
 
    void createView(size_t size) override;
 
    void setView(size_t ofs, size_t sz);
 
    void reset();
 
    void* getPtr() override;
 
    template<typename T>
    T* lock(bool readonly = false)
    {
      return static_cast<T*>(doLock(readonly));
    }
 
    void unlock(bool sync = false);
 
    bool mapView() override;
 
    bool unmapView() override;
 
    const File& getFile()
    {
      return _file;
    }
 
    [[nodiscard]] bool isLocked() const;
 
    void sync(bool async);
 
    [[nodiscard]] size_t getSize() const;
 
  private:
    void* doLock(bool readonly);
 
    bool _temp{false};
    File _file{};
    char* _ptr{nullptr};
    int _counter{0};
    size_t _size{0};
    size_t _offset{0};
    size_t _realOffset{0};
};
 
}// namespace sf::lnx