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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::chunk::RawChunk;
use crate::packet::chunk::write_chunk_header;
use crate::packet::ensure;
use std::fmt;
pub(crate) const CHUNK_TYPE: u8 = 8;
/// Shutdown Acknowledgement (SHUTDOWN ACK) chunk
///
/// See <https://datatracker.ietf.org/doc/html/rfc9260#section-3.3.9>.
///
/// ```txt
/// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/// | Type = 8 | Chunk Flags | Length = 4 |
/// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/// ```
#[derive(Debug)]
pub struct ShutdownAckChunk {}
impl TryFrom<RawChunk<'_>> for ShutdownAckChunk {
type Error = ChunkParseError;
fn try_from(raw: RawChunk<'_>) -> Result<Self, ChunkParseError> {
ensure!(raw.typ == CHUNK_TYPE, ChunkParseError::InvalidType);
ensure!(raw.value.is_empty(), ChunkParseError::InvalidLength);
Ok(Self {})
}
}
impl SerializableTlv for ShutdownAckChunk {
fn serialize_to(&self, output: &mut [u8]) {
write_chunk_header(CHUNK_TYPE, 0, self.value_size(), output);
}
fn value_size(&self) -> usize {
0
}
}
impl fmt::Display for ShutdownAckChunk {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "SHUTDOWN-ACK")
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn init_from_capture() {
// SHUTDOWN_ACK chunk
// Chunk type: SHUTDOWN_ACK (8)
// Chunk flags: 0x00
// Chunk length: 4
const BYTES: &[u8] = &[0x08, 0x00, 0x00, 0x04];
ShutdownAckChunk::try_from(RawChunk::from_bytes(BYTES).unwrap().0).unwrap();
}
#[test]
fn serialize_and_deserialize() {
let chunk = ShutdownAckChunk {};
let mut serialized = vec![0; chunk.serialized_size()];
chunk.serialize_to(&mut serialized);
ShutdownAckChunk::try_from(RawChunk::from_bytes(&serialized).unwrap().0).unwrap();
}
#[test]
fn display() {
let chunk = ShutdownAckChunk {};
assert_eq!(chunk.to_string(), "SHUTDOWN-ACK");
}
}