class_docstr: SEVIRI native format reader.
  
  **Calibration**
  
  See :mod:`satpy.readers.seviri_base`.
  
  **Padding channel data to full disk**
  
  By providing the `fill_disk` as True in the `reader_kwargs`, the channel is loaded
  as full disk, padded with no-data where necessary. This is especially useful for the
  HRV channel, but can also be used for RSS and ROI data. By default, the original,
  unpadded, data are loaded::
  
      scene = satpy.Scene(filenames,
                          reader='seviri_l1b_native',
                          reader_kwargs={'fill_disk': False})
  
  **Metadata**
  
  See :mod:`satpy.readers.seviri_base`.
docstr: Initialize the reader.
docstr_tok: ["Initialize","the","reader","."]
code: def __init__(
      self,
      filename,
      filename_info,
      filetype_info,
      calib_mode="nominal",
      fill_disk=False,
      ext_calib_coefs=None,
      include_raw_metadata=False,
      mda_max_array_size=100,
  ):
      """Initialize the reader."""
      super(NativeMSGFileHandler, self).__init__(
          filename, filename_info, filetype_info
      )
      self.platform_name = None
      self.calib_mode = calib_mode
      self.ext_calib_coefs = ext_calib_coefs or {}
      self.fill_disk = fill_disk
      self.include_raw_metadata = include_raw_metadata
      self.mda_max_array_size = mda_max_array_size
  
      # Declare required variables.
      self.header = {}
      self.mda = {}
      self.trailer = {}
  
      # Read header, prepare dask-array, read trailer and initialize image boundaries
      # Available channels are known only after the header has been read
      self.header_type = get_native_header(
          has_archive_header(self.filename)
      )
      self._read_header()
      self.dask_array = da.from_array(
          self._get_memmap(), chunks=(CHUNK_SIZE,)
      )
      self._read_trailer()
      self.image_boundaries = ImageBoundaries(
          self.header, self.trailer, self.mda
      )
  
imports: import logging
  import warnings
  from datetime import datetime, timedelta
  import dask.array
  import numpy
  import xarray
  from pyresample import geometry
  from satpy._compat import cached_property
  from satpy.readers._geos_area import get_area_definition, get_geos_area_naming
  from satpy.readers.eum_base import get_service_mode, recarray2dict, time_cds_short
  from satpy.readers.file_handlers import BaseFileHandler
  from satpy.readers.seviri_base import CHANNEL_NAMES, HRV_NUM_COLUMNS, HRV_NUM_LINES, REPEAT_CYCLE_DURATION, SATNUM, VISIR_NUM_COLUMNS, VISIR_NUM_LINES, NoValidOrbitParams, OrbitPolynomialFinder, SEVIRICalibrationHandler, add_scanline_acq_time, calculate_area_extent, create_coef_dict, dec10216, get_cds_time, get_satpos, pad_data_horizontally, pad_data_vertically, round_nom_time
  from satpy.readers.seviri_l1b_native_hdr import DEFAULT_15_SECONDARY_PRODUCT_HEADER, GSDTRecords, get_native_header, native_trailer
  from satpy.readers.utils import reduce_mda
  from satpy.utils import get_legacy_chunk_size
label_desc: Use image node_id 1 to create a new NativeMSGFileHandler object from inherited base classes: BaseFileHandler with example: obj = NativeMSGFileHandler(filename, filename_info, filetype_info, calib_mode, fill_disk, ext_calib_coefs, include_raw_metadata, mda_max_array_size)