How to use the minidump.header.MinidumpHeader function in minidump

def parse(buff):
		mh = MinidumpHeader()
		mh.Signature = buff.read(4).decode()[::-1]
		if mh.Signature != 'PMDM':
			raise MinidumpHeaderSignatureMismatchException(mh.Signature)
		mh.Version = int.from_bytes(buff.read(2), byteorder = 'little', signed = False)
		mh.ImplementationVersion = int.from_bytes(buff.read(2), byteorder = 'little', signed = False)
		mh.NumberOfStreams = int.from_bytes(buff.read(4), byteorder = 'little', signed = False)
		mh.StreamDirectoryRva = int.from_bytes(buff.read(4), byteorder = 'little', signed = False)
		mh.CheckSum = int.from_bytes(buff.read(4), byteorder = 'little', signed = False)
		mh.Reserved = int.from_bytes(buff.read(4), byteorder = 'little', signed = False)
		mh.TimeDateStamp = int.from_bytes(buff.read(4), byteorder = 'little', signed = False)
		try:
			mh.Flags = MINIDUMP_TYPE(int.from_bytes(buff.read(4), byteorder = 'little', signed = False))
		except Exception as e:
			raise MinidumpHeaderFlagsException('Could not parse header flags!')

		return mh

def prepare_header(self):
		self.header = MinidumpHeader()
		self.header.Version = 1
		self.header.ImplementationVersion = 1
		self.header.NumberOfStreams = len(self.streams) +1 # +1 is fot he memory info stream
		self.header.StreamDirectoryRva = self.directory_rva
		#self.header.CheckSum = None
		#self.header.Reserved = None
		#self.header.TimeDateStamp = None
		self.header.Flags = MINIDUMP_TYPE.MiniDumpWithFullMemory
		self.header_buffer.write(self.header.to_bytes())

def __parse_header(self):
		self.header = MinidumpHeader.parse(self.file_handle)
		for i in range(0, self.header.NumberOfStreams):
			self.file_handle.seek(self.header.StreamDirectoryRva + i * 12, 0 )
			minidump_dir = MINIDUMP_DIRECTORY.parse(self.file_handle)
			
			if minidump_dir:
				self.directories.append(minidump_dir)
			else:
				self.file_handle.seek(self.header.StreamDirectoryRva + i * 12, 0 )
				user_stream_type_value = MINIDUMP_DIRECTORY.get_stream_type_value(self.file_handle)
				logging.debug('Found Unknown UserStream directory Type: %x' % (user_stream_type_value))