Struct Header 

pub struct Header {
    pub packet_type: PacketType,
    pub packet_count: u8,
    pub superframe_idx: u8,
    pub t2mi_stream_id: u8,
    pub payload_len_bits: u16,
}

T2-MI packet header (6 bytes / 48 bits) per §5.1.

Layout:

• byte 0: packet_type (8 bits) — Table 1
• byte 1: packet_count (8 bits) — wraps 0xFF→0x00, arbitrary start
• byte 2 [7:4]: superframe_idx (4 bits)
• byte 2 [3]: rfu (1 bit) — must be 0
• byte 2 [2:0]: t2mi_stream_id (3 bits)
• byte 3: rfu (8 bits) — must be 0
• byte 4-5: payload_len (16 bits, unit = bits)

Fields

packet_type: PacketType

Table 1 packet type.

packet_count: u8

Wraps 0xFF→0x00; arbitrary start value.

superframe_idx: u8

Super-frame index [0..=15].

t2mi_stream_id: u8

T2-MI stream ID [0..=7].

payload_len_bits: u16

Payload length in bits (not bytes).

Implementations

impl Header

pub fn payload_len_bytes(&self) -> usize

Compute payload length in bytes (ceil(bits / 8)).

pub fn total_bytes(&self) -> usize

Total packet size including header + payload + CRC-32 trailer, in bytes.

= 6 (header) + ceil(payload_len_bits / 8) (payload + padding) + 4 (CRC).

pub fn raw_payload_bytes(packet: &[u8]) -> Result<&[u8], Error>

Slice the payload bytes out of a raw T2-MI packet buffer without requiring the packet_type byte to be a known PacketType.

Reads payload_len_bits from bytes [4..6], computes ceil(payload_len_bits / 8), and returns packet[HEADER_LEN..HEADER_LEN + payload_len_bytes].

Errors

Returns Error::BufferTooShort if packet.len() < HEADER_LEN. Returns Error::PayloadLengthMismatch if the buffer is too short for the declared payload_len_bits.

pub fn payload_bytes<'a>(&self, packet: &'a [u8]) -> Result<&'a [u8], Error>

Slice the payload bytes out of the full packet buffer this header was parsed from (the 6 header bytes, then payload_len_bytes() of payload, then the 4-byte CRC trailer).

Errors with Error::PayloadLengthMismatch when the buffer is too short for the declared payload_len_bits.

Trait Implementations

impl Clone for Header

fn clone(&self) -> Header

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Header

impl Debug for Header

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for Header

impl<'a> Parse<'a> for Header

type Error = Error

The error type this implementer returns. Typically the enclosing crate’s Error enum.

fn parse(bytes: &'a [u8]) -> Result<Self, Error>

Parse bytes as Self. Returns Err(Self::Error) on any protocol violation or buffer underrun.

impl PartialEq for Header

fn eq(&self, other: &Header) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Header

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Serialize for Header

type Error = Error

The error type this implementer returns (usually the same as the corresponding Parse impl, but need not be).

fn serialized_len(&self) -> usize

Number of bytes serialize_into will write.

fn serialize_into(&self, buf: &mut [u8]) -> Result<usize, Error>

Write the serialised form into buf. Returns the number of bytes written (always equal to serialized_len()).

fn to_bytes(&self) -> Vec<u8>

where Self::Error: Debug,

Convenience: allocate a Vec and serialise into it.

impl StructuralPartialEq for Header