Struct BitArray 

pub struct BitArray { /* private fields */ }

A 128-bit mask, indexed from the most significant bit.

Bit 0 is the most significant bit, matching how FlexFEC packet masks are laid out on the wire: the first media packet after the base sequence number is the leftmost bit. Upstream keeps this as a Lo/Hi pair of u64s; a single u128 is the same bits with the seam removed.

Implementations

impl BitArray

pub fn new() -> Self

An empty mask.

pub fn set_bit(&mut self, index: u32)

Set the bit at index, counting from the most significant.

Out-of-range indices are ignored rather than panicking: coverage is computed from packet counts that are already bounded, so a stray index means a caller bug, not a packet the mask should silently mis-cover.

pub fn bit(&self, index: u32) -> bool

Whether the bit at index is set.

pub fn reset(&mut self)

Clear every bit.

pub fn is_empty(&self) -> bool

Whether no bits are set.

pub fn mask1(&self) -> u16

The 15-bit mask covering media packets 0..=14 — the one always present on the wire.

pub fn mask2(&self) -> u32

The 31-bit mask covering media packets 15..=45, present when the first k-bit is clear.

pub fn mask3(&self) -> u64

The 64-bit mask covering media packets 46..=109, as RFC 8627 lays it out.

pub fn mask3_draft03(&self) -> u64

The draft-03 variant of mask3: 63 bits rather than 64.

Draft-03 spends one more bit on the k-flag than the published RFC does, so the third mask is one bit narrower and the whole field shifts down by one. This is the single most consequential difference between the two formats at the bit level, and the reason a draft-03 round trip proves nothing about RFC 8627 conformance.

Trait Implementations

impl Clone for BitArray

fn clone(&self) -> BitArray

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for BitArray

impl Debug for BitArray

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

Formats the value using the given formatter.

impl Default for BitArray

fn default() -> BitArray

Returns the “default value” for a type.

impl Eq for BitArray

impl PartialEq for BitArray

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for BitArray