Struct PacketCodec 

pub struct PacketCodec { /* private fields */ }

Frames and parses ECR17 packets for a given LrcMode.

Implementations

impl PacketCodec

pub fn new(mode: LrcMode) -> Self

Creates a codec that computes LRCs under mode.

pub fn lrc_mode(&self) -> LrcMode

The configured LRC mode.

pub fn encode_application(&self, payload: &[u8]) -> Vec<u8>

Encodes an application frame: STX + payload + ETX + LRC.

pub fn encode_control(&self, ctrl: u8) -> Vec<u8>

Encodes a control frame: ctrl + ETX + LRC, where the LRC is computed over the single-byte payload [ctrl] under the configured LrcMode (so it folds STX/ETX exactly as an application-frame LRC would).

pub fn decode(&self, data: &[u8]) -> DecodedPacket

Decodes exactly one frame from data.

ACK/NAK are recognized by their lead byte only: on the wire a control frame is ctrl + ETX + LRC (what encode_control produces and what the session frames), so [ACK, ETX, LRC] decodes to PacketType::Ack. This leniency is required — the session hands decode the full 3-byte control frame, and requiring a bare 1-byte ACK would make every transaction’s ACK handshake fail. See docs/LESSON.md.

For STX/SOH frames the buffer must be exactly one frame: more than one frame, trailing bytes after the LRC, a missing LRC, or a progress frame not terminated by EOT all decode to PacketType::Unknown.

Trait Implementations

impl Clone for PacketCodec

fn clone(&self) -> PacketCodec

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for PacketCodec

impl Debug for PacketCodec

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

Formats the value using the given formatter.