Struct adler32::RollingAdler32

pub struct RollingAdler32 { /* fields omitted */ }

A rolling version of the Adler32 hash, which can 'forget' past bytes.

Calling remove() will update the hash to the value it would have if that past byte had never been fed to the algorithm. This allows you to get the hash of a rolling window very efficiently.

Methods

impl RollingAdler32

pub fn new() -> RollingAdler32

Creates an empty Adler32 context (with hash 1).

pub fn from_value(adler32: u32) -> RollingAdler32

Creates an Adler32 context with the given initial value.

pub fn from_buffer(buffer: &[u8]) -> RollingAdler32

Convenience function initializing a context from the hash of a buffer.

pub fn hash(&self) -> u32

Returns the current hash.

pub fn remove(&mut self, size: usize, byte: u8)

Removes the given byte that was fed to the algorithm size bytes ago.

pub fn update(&mut self, byte: u8)

Feeds a new byte to the algorithm to update the hash.

pub fn update_buffer(&mut self, buffer: &[u8])

Feeds a vector of bytes to the algorithm to update the hash.