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stash: deduplicate Fnv1aHasher; add derive for u64 wrapper

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Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: Ic2886815721f6eefc66a8ddacd44fb286a6a6964
This commit is contained in:
raf 2026-04-01 14:38:47 +03:00
commit d643376cd7
4 changed files with 108 additions and 58 deletions
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33
src/db/mod.rs
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@ -11,6 +11,10 @@ use std::{
pub mod nonblocking;
use std::hash::Hasher;
use crate::hash::Fnv1aHasher;
/// Cache for process scanning results to avoid expensive `/proc` reads on every
/// store operation. TTL of 5 seconds balances freshness with performance.
struct ProcessCache {
@ -66,35 +70,6 @@ impl ProcessCache {
}
}
/// FNV-1a hasher for deterministic hashing across process runs.
/// Unlike `DefaultHasher` (`SipHash` with random seed), this produces stable
/// hashes.
pub struct Fnv1aHasher {
state: u64,
}
impl Fnv1aHasher {
const FNV_OFFSET: u64 = 0xCBF29CE484222325;
const FNV_PRIME: u64 = 0x100000001B3;
pub fn new() -> Self {
Self {
state: Self::FNV_OFFSET,
}
}
pub fn write(&mut self, bytes: &[u8]) {
for byte in bytes {
self.state ^= u64::from(*byte);
self.state = self.state.wrapping_mul(Self::FNV_PRIME);
}
}
pub fn finish(&self) -> u64 {
self.state
}
}
use base64::prelude::*;
use log::{debug, error, info, warn};
use mime_sniffer::MimeTypeSniffer;