class_docstr: SEVIRI HRIT prologue reader.
class_docstr_tok: ["SEVIRI","HRIT","prologue","reader","."]
docstr: Initialize the reader.
code: def __init__(
      self,
      filename,
      filename_info,
      filetype_info,
      calib_mode="nominal",
      ext_calib_coefs=None,
      include_raw_metadata=False,
      mda_max_array_size=None,
      fill_hrv=None,
      mask_bad_quality_scan_lines=None,
  ):
      """Initialize the reader."""
      super(HRITMSGPrologueFileHandler, self).__init__(
          filename,
          filename_info,
          filetype_info,
          (msg_hdr_map, msg_variable_length_headers, msg_text_headers),
      )
      self.prologue = {}
      self.read_prologue()
  
      service = filename_info["service"]
      if service == "":
          self.mda["service"] = "0DEG"
      else:
          self.mda["service"] = service
  
imports: from __future__ import division
  import copy
  import logging
  from datetime import timedelta
  import dask.array
  import numpy
  import xarray
  from pyresample import geometry
  import satpy.readers.utils
  from satpy._compat import cached_property
  from satpy.readers._geos_area import get_area_definition, get_area_extent, get_geos_area_naming
  from satpy.readers.eum_base import get_service_mode, recarray2dict, time_cds_short
  from satpy.readers.hrit_base import HRITFileHandler, ancillary_text, annotation_header, base_hdr_map, image_data_function
  from satpy.readers.seviri_base import CHANNEL_NAMES, HRV_NUM_COLUMNS, REPEAT_CYCLE_DURATION, SATNUM, NoValidOrbitParams, OrbitPolynomialFinder, SEVIRICalibrationHandler, add_scanline_acq_time, create_coef_dict, get_cds_time, get_satpos, mask_bad_quality, pad_data_horizontally, round_nom_time
  from satpy.readers.seviri_l1b_native_hdr import hrit_epilogue, hrit_prologue, impf_configuration
  from satpy.utils import get_legacy_chunk_size
label_desc: Use image node_id 1 to create a new HRITMSGPrologueFileHandler object from inherited base classes: HRITMSGPrologueEpilogueBase with example: obj = HRITMSGPrologueFileHandler(filename, filename_info, filetype_info, calib_mode, ext_calib_coefs, include_raw_metadata, mda_max_array_size, fill_hrv, mask_bad_quality_scan_lines)