def parse_field(line, d):
    """ Extract regular field & value from:

            Destination directory = "R:\speed-test\big_files\"
            Directories processed = 1
            Total data in bytes   = 527,331,269
            ...
    """
    if " = " in line:
        field, value = line.split(" = ")
        d[field.strip()] = value.strip()
    return d