Struct MatchModel 

pub struct MatchModel { /* private fields */ }

Match model: finds longest match in history, predicts from continuation.

Implementations

impl MatchModel

pub fn new() -> Self

pub fn with_sizes(buf_size: usize, hash_size: usize) -> Self

Create a match model with custom ring buffer and hash table sizes. Both sizes must be powers of 2.

pub fn predict(&mut self, _c0: u32, bpos: u8, c1: u8, c2: u8, c3: u8) -> u32

Predict probability of bit=1 based on match continuation. Returns 12-bit probability in [1, 4095].

c0: partial byte being decoded (1-255). bpos: bit position (0-7). c1: last completed byte. c2: second-to-last byte. c3: third-to-last byte.

pub fn update(&mut self, bit: u8, bpos: u8, c0: u32, c1: u8, c2: u8)

Update match model after observing bit.

bit: observed bit. bpos: bit position (0-7). c0: partial byte (after this bit). c1: last completed byte (if bpos==7, this byte just completed).

pub fn match_length_quantized(&self) -> u8

Return the quantized match length for mixer context. 0=no match, 1=short, 2=medium, 3=long.

pub fn last_prediction(&self) -> u32

Return the last predicted probability (for APM context).

Trait Implementations

impl Default for MatchModel

fn default() -> Self

Returns the “default value” for a type.