Struct RollingChecksum 

pub struct RollingChecksum { /* private fields */ }

Rolling weak checksum over a fixed-length window.

Construct from a window with RollingChecksum::new, read the current value with RollingChecksum::value, and slide forward one byte at a time with RollingChecksum::roll.

Implementations

impl RollingChecksum

pub fn new(window: &[u8]) -> Self

Compute the checksum freshly over window.

The window length is fixed for the life of this value; roll keeps it constant.

pub fn roll(&mut self, out_byte: u8, in_byte: u8)

Slide the window one byte to the right.

out_byte is the byte leaving the window on the left; in_byte is the byte entering on the right. The window length is preserved.

pub fn value(&self) -> u32

The current checksum value, a + b * M, with a and b reduced mod M.

pub fn window_len(&self) -> u32

The fixed window length this checksum tracks.

Trait Implementations

impl Clone for RollingChecksum

fn clone(&self) -> RollingChecksum

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for RollingChecksum

impl Debug for RollingChecksum

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

Formats the value using the given formatter.