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use core::hash::Hasher;
use {hash_seeded, helper};
pub struct SeaHasher {
state: u64,
k1: u64,
k2: u64,
k3: u64,
k4: u64,
}
impl Default for SeaHasher {
fn default() -> SeaHasher {
SeaHasher::with_seeds(0xe7b0c93ca8525013, 0x011d02b854ae8182, 0x7bcc5cf9c39cec76, 0xfa336285d102d083)
}
}
impl SeaHasher {
pub fn new() -> SeaHasher {
SeaHasher::default()
}
pub fn with_seeds(k1: u64, k2: u64, k3: u64, k4: u64) -> SeaHasher {
SeaHasher {
state: k1 ^ k3,
k1: k1,
k2: k2,
k3: k3,
k4: k4,
}
}
fn write(&mut self, n: u64, k1: u64, k2: u64) {
self.state ^= n ^ k1;
self.state = helper::diffuse(self.state) ^ k2;
}
}
impl Hasher for SeaHasher {
fn finish(&self) -> u64 {
helper::diffuse(self.state ^ self.k3) ^ self.k4
}
fn write(&mut self, bytes: &[u8]) {
self.state ^= hash_seeded(bytes, self.k1, self.k2, self.k3, self.k4);
self.state = helper::diffuse(self.state);
}
fn write_u64(&mut self, n: u64) {
let k1 = self.k1;
let k2 = self.k2;
self.write(n, k1, k2)
}
fn write_u8(&mut self, n: u8) {
let k1 = self.k1;
let k3 = self.k3;
self.write(n as u64, k1, k3)
}
fn write_u16(&mut self, n: u16) {
let k1 = self.k1;
let k2 = self.k2;
self.write(n as u64, k2, k1)
}
fn write_u32(&mut self, n: u32) {
let k2 = self.k2;
let k3 = self.k3;
self.write(n as u64, k2, k3)
}
fn write_usize(&mut self, n: usize) {
let k2 = self.k2;
let k3 = self.k3;
self.write(n as u64, k3, k2)
}
fn write_i64(&mut self, n: i64) {
let k1 = self.k1;
let k2 = self.k2;
self.write(n as u64, !k1, !k2)
}
fn write_i8(&mut self, n: i8) {
let k1 = self.k1;
let k3 = self.k3;
self.write(n as u64, !k1, !k3)
}
fn write_i16(&mut self, n: i16) {
let k1 = self.k1;
let k2 = self.k2;
self.write(n as u64, !k2, !k1)
}
fn write_i32(&mut self, n: i32) {
let k2 = self.k2;
let k3 = self.k3;
self.write(n as u64, !k2, !k3)
}
fn write_isize(&mut self, n: isize) {
let k2 = self.k2;
let k3 = self.k3;
self.write(n as u64, !k3, !k2)
}
}