Struct PresenceMap 

pub struct PresenceMap { /* private fields */ }

FAST presence map.

The presence map tracks which optional fields are present in a message. Bits are consumed in order as fields are decoded.

Implementations

impl PresenceMap

pub fn new() -> PresenceMap

Creates an empty presence map.

pub fn from_bits(bits: Vec<bool>) -> PresenceMap

Creates a presence map from raw bits.

pub fn decode(data: &[u8], offset: &mut usize) -> Result<PresenceMap, FastError>

Decodes a presence map from a byte slice.

Arguments

• data - The input bytes
• offset - Current position in the data (will be updated)

Returns

The decoded presence map.

Errors

Returns FastError::UnexpectedEof if the data is incomplete.

pub fn next_bit(&mut self) -> bool

Returns the next bit from the presence map.

Returns

true if the field is present, false otherwise. Returns false if the map is exhausted.

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

Returns the bit at the specified position without consuming it.

Arguments

• index - The bit position (0-indexed)

pub fn len(&self) -> usize

Returns the number of bits in the presence map.

pub fn is_empty(&self) -> bool

Returns true if the presence map is empty.

pub fn position(&self) -> usize

Returns the current position in the presence map.

pub fn reset(&mut self)

Resets the position to the beginning.

pub fn encode(&self) -> Vec<u8>

Encodes the presence map to bytes.

Returns

The encoded bytes with stop-bit encoding.

Trait Implementations

impl Clone for PresenceMap

fn clone(&self) -> PresenceMap

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PresenceMap

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

Formats the value using the given formatter.

impl Default for PresenceMap

fn default() -> PresenceMap

Returns the “default value” for a type.