wyhash/
traits.rs

1use crate::functions::{mix_with_p0, read64, wyhash_core, wyhash_finish, wyrng};
2use core::hash::Hasher;
3use rand_core::{impls, Error, RngCore, SeedableRng};
4
5/// WyHash hasher
6#[derive(Default, Clone)]
7pub struct WyHash {
8    h: u64,
9    size: u64,
10}
11
12impl WyHash {
13    /// Create hasher with a seed
14    pub fn with_seed(seed: u64) -> Self {
15        WyHash { h: seed, size: 0 }
16    }
17}
18
19impl Hasher for WyHash {
20    #[inline]
21    fn write(&mut self, bytes: &[u8]) {
22        if bytes.is_empty() {
23            self.h = mix_with_p0(self.h);
24        } else {
25            for bytes in bytes.chunks(u64::max_value() as usize) {
26                self.h = wyhash_core(bytes, self.h);
27                self.size += bytes.len() as u64
28            }
29        }
30    }
31    #[inline]
32    fn finish(&self) -> u64 {
33        wyhash_finish(self.size, self.h)
34    }
35}
36
37/// WyRng random number generator
38#[derive(Default, Clone)]
39pub struct WyRng(u64);
40
41impl RngCore for WyRng {
42    fn next_u32(&mut self) -> u32 {
43        self.next_u64() as u32
44    }
45    fn next_u64(&mut self) -> u64 {
46        wyrng(&mut self.0)
47    }
48    fn fill_bytes(&mut self, dest: &mut [u8]) {
49        impls::fill_bytes_via_next(self, dest)
50    }
51    fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error> {
52        self.fill_bytes(dest);
53        Ok(())
54    }
55}
56
57impl SeedableRng for WyRng {
58    type Seed = [u8; 8];
59
60    fn from_seed(seed: Self::Seed) -> Self {
61        WyRng(read64(&seed))
62    }
63
64    fn seed_from_u64(state: u64) -> Self {
65        WyRng(state)
66    }
67}
wyhash/traits.rs

wyhash/
traits.rs
