56       h, nullptr, (prot & PROT_WRITE) ? PAGE_READWRITE : PAGE_READONLY, 0, 0, nullptr);  in FromOsHandle()
57   if (handle == nullptr) {  in FromOsHandle()
62           new MappedFile(const_cast<char*>(kEmptyBuffer), 0, 0, nullptr));  in FromOsHandle()
64     return nullptr;  in FromOsHandle()
68   if (base == nullptr) {  in FromOsHandle()
70     return nullptr;  in FromOsHandle()
75   void* base = mmap(nullptr, file_length, prot, MAP_SHARED, h, file_offset);  in FromOsHandle()
82     return nullptr;  in FromOsHandle()
89     : base_(std::exchange(other.base_, nullptr)),  in MappedFile()
94       handle_(std::exchange(other.handle_, nullptr))  in MappedFile()
101   base_ = std::exchange(other.base_, nullptr);  in operator =()
105   handle_ = std::exchange(other.handle_, nullptr);  in operator =()
116   if (base_ != nullptr && size_ != 0) UnmapViewOfFile(base_);  in Close()
117   if (handle_ != nullptr) CloseHandle(handle_);  in Close()
118   handle_ = nullptr;  in Close()
120   if (base_ != nullptr && size_ != 0) munmap(base_, size_ + offset_);  in Close()
123   base_ = nullptr;  in Close()