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// Copyright 2025 The dcSCTP Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use crate::packet::ChunkParseError;
use crate::packet::SerializableTlv;
use crate::packet::ensure;
use crate::packet::parameter::RawParameter;
use crate::packet::parameter::write_parameter_header;
use std::fmt;
pub(crate) const PARAMETER_TYPE: u16 = 0xC000;
/// Forward TSN supported parameter
///
/// See <https://datatracker.ietf.org/doc/html/rfc3758#section-3.1>.
///
/// ```txt
/// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/// | Parameter Type = 49152 | Parameter Length = 4 |
/// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/// ```
#[derive(Debug)]
pub struct ForwardTsnSupportedParameter {}
impl TryFrom<RawParameter<'_>> for ForwardTsnSupportedParameter {
type Error = ChunkParseError;
fn try_from(raw: RawParameter<'_>) -> Result<Self, ChunkParseError> {
ensure!(raw.typ == PARAMETER_TYPE, ChunkParseError::InvalidType);
ensure!(raw.value.is_empty(), ChunkParseError::InvalidLength);
Ok(Self {})
}
}
impl SerializableTlv for ForwardTsnSupportedParameter {
fn serialize_to(&self, output: &mut [u8]) {
write_parameter_header(PARAMETER_TYPE, self.value_size(), output);
}
fn value_size(&self) -> usize {
0
}
}
impl fmt::Display for ForwardTsnSupportedParameter {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "Forward-TSN supported")
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn serialize_and_deserialize() {
let cause = ForwardTsnSupportedParameter {};
let mut serialized = vec![0; cause.serialized_size()];
cause.serialize_to(&mut serialized);
ForwardTsnSupportedParameter::try_from(RawParameter::from_bytes(&serialized).unwrap().0)
.unwrap();
}
}