text: #!/usr/bin/env python3
  # -*- coding: utf-8 -*-
  # ******************************************************************************
  #
  #  Project:  GDAL utils.auxiliary
  #  Purpose:  utility functions for gdal-numpy integration
  #  Author:   Idan Miara <idan@miara.com>
  #
  # ******************************************************************************
  #  Copyright (c) 2020, Idan Miara <idan@miara.com>
  #
  #  Permission is hereby granted, free of charge, to any person obtaining a
  #  copy of this software and associated documentation files (the "Software"),
  #  to deal in the Software without restriction, including without limitation
  #  the rights to use, copy, modify, merge, publish, distribute, sublicense,
  #  and/or sell copies of the Software, and to permit persons to whom the
  #  Software is furnished to do so, subject to the following conditions:
  #
  #  The above copyright notice and this permission notice shall be included
  #  in all copies or substantial portions of the Software.
  #
  #  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  #  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  #  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  #  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  #  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  #  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  #  DEALINGS IN THE SOFTWARE.
  # ******************************************************************************
  
  from osgeo import gdal, gdal_array
  import numpy
  
  
  def GDALTypeCodeToNumericTypeCodeEx(buf_type, signed_byte, default=None):
      typecode = gdal_array.GDALTypeCodeToNumericTypeCode(buf_type)
      if typecode is None:
          typecode = default
  
      if buf_type == gdal.GDT_Byte and signed_byte:
          typecode = numpy.int8
      return typecode
  
  
  def GDALTypeCodeAndNumericTypeCodeFromDataSet(ds):
      buf_type = ds.GetRasterBand(1).DataType
      signed_byte = ds.GetRasterBand(1).GetMetadataItem('PIXELTYPE', 'IMAGE_STRUCTURE') == 'SIGNEDBYTE'
      np_typecode = GDALTypeCodeToNumericTypeCodeEx(buf_type, signed_byte=signed_byte, default=numpy.float32)
      return buf_type, np_typecode
  