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#
# SPDX-FileCopyrightText: 2016 - 2026 Dimitri Staessens
# SPDX-License-Identifier: LGPL-2.1-only
#
"""
Shared QoSSpec <-> qosspec_t conversion helpers.
CFFI types are not interchangeable across extension modules, so the
caller passes its own ``ffi`` instance.
"""
from __future__ import annotations
from typing import TYPE_CHECKING, Any, Optional
from ouroboros.qos import QoSSpec
if TYPE_CHECKING:
from cffi import FFI
def qos_to_qosspec(ffi: FFI, qos: Optional[QoSSpec]) -> Any:
"""
Convert a :class:`QoSSpec` to a freshly-allocated ``qosspec_t *``.
Returns ``ffi.NULL`` when *qos* is ``None``.
"""
if qos is None:
return ffi.NULL
return ffi.new("qosspec_t *",
[qos.service,
qos.delay,
qos.bandwidth,
qos.availability,
qos.loss,
qos.ber,
qos.max_gap,
qos.timeout])
def qosspec_to_qos(ffi: FFI, _qos: Any) -> Optional[QoSSpec]:
"""
Convert a ``qosspec_t *`` back to a :class:`QoSSpec`.
Returns ``None`` when *_qos* is ``ffi.NULL``.
"""
if _qos == ffi.NULL:
return None
return QoSSpec(service=_qos.service,
delay=_qos.delay,
bandwidth=_qos.bandwidth,
availability=_qos.availability,
loss=_qos.loss,
ber=_qos.ber,
max_gap=_qos.max_gap,
timeout=_qos.timeout)
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