def test_selector_from_encoded():
"""Make sure we can create a selector from an encoded value."""
sel = DataStreamSelector.FromEncoded(0x5FFF)
assert str(sel) == 'all system outputs'
sel = DataStreamSelector.FromEncoded(0xD7FF)
assert str(sel) == 'all outputs'
sel = DataStreamSelector.FromEncoded(0x100a)
assert str(sel) == 'unbuffered 10'
assert str(
DataStreamSelector.FromEncoded(
DataStreamSelector.FromString(
'all combined output').encode())) == 'all combined outputs'
def dump_begin(self, selector_id):
"""Start dumping a stream.
Args:
selector_id (int): The buffered stream we want to dump.
Returns:
(int, int, int): Error code, second error code, number of available readings
"""
if self.dump_walker is not None:
self.storage.destroy_walker(self.dump_walker)
selector = DataStreamSelector.FromEncoded(selector_id)
self.dump_walker = self.storage.create_walker(selector, skip_all=False)
return Error.NO_ERROR, Error.NO_ERROR, self.dump_walker.count()