Struct PackedReceiver 

pub struct PackedReceiver<const WIN: usize, const BUF: usize, const REASM: usize> { /* private fields */ }

Packed backend — efficient when payloads are small.

Use when segments are typically much smaller than the MTU: out-of-order payloads are bump-allocated at their actual size, so BUF can be much smaller than WIN × MTU.

OOO insert is O(1) (bump append). Delivery copies each buffered segment into the reassembly buffer — O(MSG) total.

Static memory: BUF (reorder slab) + REASM (reassembly).

• WIN — receive window (number of indexed slots)
• BUF — bump slab capacity in bytes
• REASM — reassembly buffer size

Trait Implementations

impl<const WIN: usize, const BUF: usize, const REASM: usize> ReceiverBackend for PackedReceiver<WIN, BUF, REASM>

fn new() -> Self

Create a new backend with empty buffers.

fn handle_data( &mut self, seq: SequenceCount, flags: SequenceFlag, payload: &[u8], ) -> Result<DataOutcome, ReceiverError>

Process a received data packet.

fn skip_gap(&mut self) -> Result<GapOutcome, ReceiverError>

Skip the current gap (advance past missing packets).

fn take_message(&mut self) -> Option<&[u8]>

Take the complete message.

fn reassembly_data(&self, len: usize) -> &[u8]

Returns a slice of the reassembly buffer.

fn has_message(&self) -> bool

Check if there’s a complete message ready.

fn message_len(&self) -> Option<usize>

Returns the length of the pending message, if any.

fn consume_message<Ret>(&mut self, f: impl FnOnce(&[u8]) -> Ret) -> Option<Ret>

Pass the pending message to f and mark it consumed.

fn expected_seq(&self) -> SequenceCount

Get the current expected sequence number.

fn recv_bitmap(&self) -> u16

Get the selective ACK bitmap.