mutated_field.py 文件源码

def __init__(self, value, num_bits=1, fuzzable=True, name=None):
        '''
        :param value: value to mutate (str)
        :param num_bits: number of consequtive bits to flip (invert)
        :param fuzzable: is field fuzzable (default: True)
        :param name: name of the object (default: None)

        :raises: ``KittyException`` if num_bits is bigger than the value length in bits
        :raises: ``KittyException`` if num_bits is not positive
        '''
        kassert.is_of_types(value, types.StringTypes)
        if len(value) * 8 < num_bits:
            raise KittyException('len of value in bits(%d) < num_bits(%d)' % (len(value) * 8, num_bits))
        if num_bits <= 0:
            raise KittyException('num_bits(%d) <= 0' % (num_bits))
        super(BitFlip, self).__init__(value=Bits(bytes=value), encoder=ENC_BITS_DEFAULT, fuzzable=fuzzable, name=name)
        self._data_len = len(value) * 8
        self._num_bits = num_bits
        self._num_mutations = self._data_len - (num_bits - 1)