def _before_unpack(self, opts):
CField._before_unpack(self, opts)
try:
opts['length'] = opts['data'].index('\0', opts['offset']) - opts['offset'] + 1
if "max_length" in opts:
opts['length'] = min(opts['max_length'], opts['length'])
except ValueError:
raise UnpackException("Unterminated null string occured.")
def __init__(self, idx, default=0, **kwargs):
CField.__init__(self, idx, default, **kwargs)
self.add_constraint(const.ValueTypeConstraint(numbers.Integral))
self.__ctype = kwargs.get("ctype", "int")
def set_value(self, obj, value):
if not isinstance(value, bytes) or value[-1] != b'\0':
raise ValueError("NullStringField value must a string with last character == '\\0'.")
return CField.set_value(self, obj, value)
def _retrieve_value(self, opts):
(v, offset) = CField._retrieve_value(self, opts)
return (v[0], offset)
def pack(self, obj, offset, **opts):
value = getattr(obj, self.name)
return CField.pack(self, obj, offset, length=len(value), **opts)
def __init__(self, idx, default='', length=0, **kwargs):
CField.__init__(self, idx, default, **dict(kwargs, length=length))
def set_value(self, obj, value):
wrapper = ListItemWrapper(value)
wrapper._set_action = self.item_set_value
wrapper._get_action = self.item_get_value
return CField.set_value(self, obj, wrapper)
def __init__(self, idx, subfield, default=[], length=0, **kwargs):
CField.__init__(self, idx, default, **dict(kwargs, length=length))
self.__subfield = subfield
def __init__(self, idx, struct, default=None, **kwargs):
CField.__init__(self, idx, default, **kwargs)
self._struct_klass = struct