def deserialize(self, reader: serialization.BinaryReader) -> None:
"""
Deserialize the object from a binary stream.
Args:
reader: instance.
"""
self.hash_start = reader.read_serializable(types.UInt256)
self.count = reader.read_int16()
def deserialize(self, reader: serialization.BinaryReader) -> None:
"""
Deserialize the object from a binary stream.
Args:
reader: instance.
Raises:
ValueError: if `count` is zero or exceeds
:const:`~neo3.network.payloads.getblocks.GetBlockByIndexPayload.MAX_BLOCKS_COUNT`.
"""
self.index_start = reader.read_uint32()
self.count = reader.read_int16()
if self.count < 1 or self.count == 0 or self.count > HeadersPayload.MAX_HEADERS_COUNT:
raise ValueError("Deserialization error - invalid count")
