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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def decode(self, data):
 """ Parses the file, creating a CWRFile from it. It requires a dictionary with two values: - filename, containing the filename - contents, containing the file contents :param data: dictionary with the data to parse :return: a CWRFile instance """

        file_name = self._filename_decoder.decode(data['filename'])

        file_data = data['contents']
        i = 0
        max_size = len(file_data)
        while file_data[i:i + 1] != 'H' and i < max_size:
            i += 1
        if i > 0:
            data['contents'] = file_data[i:]

        transmission = self._file_decoder.decode(data['contents'])[0]

        return CWRFile(file_name, transmission)