Struct Hasher 

pub struct Hasher {
    pub(crate) amount: u64,
    pub(crate) state: u32,
    pub(crate) spec: Option<State>,
}

Represents an in-progress CRC32 computation.

Fields

amount: u64

state: u32

spec: Option<State>

Implementations

impl Hasher

pub fn new() -> Self

Create a new Hasher.

This will perform a CPU feature detection at runtime to select the most optimal implementation for the current processor architecture.

pub fn new_with_initial(init: u32) -> Self

Create a new Hasher with an initial CRC32 state.

This works just like Hasher::new, except that it allows for an initial CRC32 state to be passed in.

pub fn new_with_initial_len(init: u32, amount: u64) -> Self

Create a new Hasher with an initial CRC32 state.

As new_with_initial, but also accepts a length (in bytes). The resulting object can then be used with combine to compute crc(a || b) from crc(a), crc(b), and len(b).

pub fn update(&mut self, buf: &[u8])

Process the given byte slice and update the hash state.

pub fn total_len(&self) -> u64

Returns the total number of bytes represented by this hash state.

This includes the length passed to Hasher::new_with_initial_len and the lengths of any hash states added with Hasher::combine. Hasher::reset sets the length back to zero.

A state created with Hasher::new_with_initial starts with a length of zero because the length of the initial state is not known.

use crc32fast::Hasher;

let mut hasher = Hasher::new();
hasher.update(b"hello");
hasher.update(b" world");
assert_eq!(hasher.total_len(), 11);

pub fn finalize(self) -> u32

Finalize the hash state and return the computed CRC32 value.

pub fn reset(&mut self)

Reset the hash state.

pub fn combine(&mut self, other: &Self)

Combine the hash state with the hash state for the subsequent block of bytes.

Trait Implementations

impl Clone for Hasher

fn clone(&self) -> Hasher

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Hasher

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

Formats the value using the given formatter.

impl Default for Hasher

fn default() -> Self

Returns the “default value” for a type.

impl Hasher for Hasher

fn write(&mut self, bytes: &[u8])

Writes some data into this Hasher.

fn finish(&self) -> u64

Returns the hash value for the values written so far.

fn write_u8(&mut self, i: u8)

Writes a single u8 into this hasher.

fn write_u16(&mut self, i: u16)

Writes a single u16 into this hasher.

fn write_u32(&mut self, i: u32)

Writes a single u32 into this hasher.

fn write_u64(&mut self, i: u64)

Writes a single u64 into this hasher.

fn write_u128(&mut self, i: u128)

Writes a single u128 into this hasher.

fn write_usize(&mut self, i: usize)

Writes a single usize into this hasher.

fn write_i8(&mut self, i: i8)

Writes a single i8 into this hasher.

fn write_i16(&mut self, i: i16)

Writes a single i16 into this hasher.

fn write_i32(&mut self, i: i32)

Writes a single i32 into this hasher.

fn write_i64(&mut self, i: i64)

Writes a single i64 into this hasher.

fn write_i128(&mut self, i: i128)

Writes a single i128 into this hasher.

fn write_isize(&mut self, i: isize)

Writes a single isize into this hasher.

fn write_length_prefix(&mut self, len: usize)

🔬This is a nightly-only experimental API. (hasher_prefixfree_extras)

Writes a length prefix into this hasher, as part of being prefix-free.

fn write_str(&mut self, s: &str)

🔬This is a nightly-only experimental API. (hasher_prefixfree_extras)

Writes a single str into this hasher.