Volumes: implement missing features

[mfranceschi]

• std::uint16_t getBootSectorsCount()
  • https://learn.microsoft.com/en-us/windows/win32/api/winioctl/ni-winioctl-fsctl_get_boot_area_info
  • https://learn.microsoft.com/en-us/windows-hardware/drivers/ifs/fsctl-get-boot-area-info
  • https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/ntifs/ns-ntifs-_boot_area_info
  • Probably requires Windows Drivers SDK
• bool isCompressed()
  • https://learn.microsoft.com/en-us/windows/win32/api/winioctl/ni-winioctl-fsctl_get_compression
  • http://winapi.freetechsecrets.com/win32/WIN32FSCTLGETCOMPRESSION.htm

Misc notes:

• Create a File Handle to a drive: https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-createfilea#physical-disks-and-volumes

[mfranceschi]

struct IoControl_GetBootSectorsInfo {
    IoControl_GetBootSectorsInfo(const std::wstring& rootPath) {
        const std::wstring name = LR"(\\.\)" + rootPath.substr(0, 2);
        HANDLE handle = CreateFileW(
            name.c_str(), GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
            nullptr, OPEN_EXISTING, 0, nullptr);
        MF::SystemErrors::Win32::throwCurrentSystemErrorIf(handle == INVALID_HANDLE_VALUE);

        DWORD bytesReturned{0};
        const bool success = DeviceIoControl(
                                 (HANDLE)handle, // handle to volume
                                 FSCTL_GET_BOOT_AREA_INFO, // dwIoControlCode
                                 nullptr, // input buffer
                                 0, // size of input buffer
                                 &bootAreaInfo, // output buffer
                                 sizeof(bootAreaInfo), // size of output buffer
                                 &bytesReturned, nullptr) == TRUE;
        CloseHandle(handle);
        MF::SystemErrors::Win32::throwCurrentSystemErrorIf(!success);
    }

    uint16_t getBootSectorsCount() const {
        std::cout << "BootSectorCount=" << bootAreaInfo.BootSectorCount
                  << ", BootSector0=" << bootAreaInfo.BootSectors[0].Offset.QuadPart
                  << ", BootSector1=" << bootAreaInfo.BootSectors[1].Offset.QuadPart;
        return bootAreaInfo.BootSectorCount;
    }

   private:
    BOOT_AREA_INFO bootAreaInfo{0};
};

But I suspect this API to be deprecated since it only proposes 2 mount points; it might have been created for a specific boot sector layout that has been superseded now.