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Auto merge of #6310 - frewsxcv:rm-unused-file, r=Manishearth

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bors-servo 2015-06-08 23:29:47 -05:00
commit 1c636dd2d0
1 changed files with 0 additions and 34 deletions
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components/util/fnv.rs
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//! This file stolen wholesale from rustc/src/librustc/util/nodemap.rs
use std::default::Default;
use std::hash::Hasher;
use std::num::wrapping::WrappingOps;
/// A speedy hash algorithm for node ids and def ids. The hashmap in
/// libcollections by default uses SipHash which isn't quite as speedy as we
/// want. In the compiler we're not really worried about DOS attempts, so we
/// just default to a non-cryptographic hash.
///
/// This uses FNV hashing, as described here:
/// http://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function
pub struct FnvHasher(u64);
impl Default for FnvHasher {
fn default() -> FnvHasher { FnvHasher(0xcbf29ce484222325) }
}
impl Hasher for FnvHasher {
fn finish(&self) -> u64 { self.0 }
fn write(&mut self, bytes: &[u8]) {
let FnvHasher(mut hash) = *self;
for byte in bytes.iter() {
hash = hash ^ (*byte as u64);
hash = hash.wrapping_mul(0x100000001b3);
}
*self = FnvHasher(hash);
}
}