def view_from_backing(cls: Type[BL], node: Node, hook: Optional[ViewHook] = None) -> BL:
contents_depth = cls.contents_depth()
contents_node = node.get_left()
length = uint256.view_from_backing(node.get_right())
if length > cls.limit():
raise Exception("ByteList backing declared length exceeds limit")
if contents_depth == 0:
return cls.decode_bytes(contents_node.root[:length])
else:
chunk_count = (length + 31) // 32
chunks = [contents_node.getter(to_gindex(i, contents_depth)) for i in range(chunk_count)]
bytez = b"".join(ch.root for ch in chunks)[:length]
return cls.decode_bytes(bytez)
def length(self) -> int:
ll_node = super().get_backing().get_right()
ll = cast(uint256, uint256.view_from_backing(node=ll_node, hook=None))
return int(ll)