1
use super::{chunk_header::*, chunk_type::*, *};
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3
///chunkShutdown represents an SCTP Chunk of type chunkShutdown
4
///
5
///0                   1                   2                   3
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///0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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///+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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///|   Type = 7    | Chunk  Flags  |      Length = 8               |
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///+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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///|                      Cumulative TSN Ack                       |
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///+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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#[derive(Default, Debug, Clone)]
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pub(crate) struct ChunkShutdown {
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    pub(crate) cumulative_tsn_ack: u32,
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}
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pub(crate) const CUMULATIVE_TSN_ACK_LENGTH: usize = 4;
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/// makes chunkShutdown printable
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impl fmt::Display for ChunkShutdown {
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    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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        write!(f, "{}", self.header())
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    }
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}
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impl Chunk for ChunkShutdown {
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    fn header(&self) -> ChunkHeader {
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        ChunkHeader {
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            typ: CT_SHUTDOWN,
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            flags: 0,
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            value_length: self.value_length() as u16,
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        }
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    }
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    fn unmarshal(raw: &Bytes) -> Result<Self> {
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        let header = ChunkHeader::unmarshal(raw)?;
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        if header.typ != CT_SHUTDOWN {
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            return Err(Error::ErrChunkTypeNotShutdown);
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        }
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        if header.value_length() != CUMULATIVE_TSN_ACK_LENGTH {
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            return Err(Error::ErrInvalidChunkSize);
44
        }
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        let reader = &mut raw.slice(CHUNK_HEADER_SIZE..CHUNK_HEADER_SIZE + header.value_length());
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        let cumulative_tsn_ack = reader.get_u32();
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        Ok(ChunkShutdown { cumulative_tsn_ack })
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    }
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    fn marshal_to(&self, writer: &mut BytesMut) -> Result<usize> {
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        self.header().marshal_to(writer)?;
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        writer.put_u32(self.cumulative_tsn_ack);
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        Ok(writer.len())
57
    }
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    fn check(&self) -> Result<()> {
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        Ok(())
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    }
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    fn value_length(&self) -> usize {
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        CUMULATIVE_TSN_ACK_LENGTH
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    }
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    fn as_any(&self) -> &(dyn Any + Send + Sync) {
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        self
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    }
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}