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{"files":{"Cargo.toml":"ddcbd9309cebf3ffd26f87e09bb8f971793535955ebfd9a7196eba31a53471f8","FAQ.md":"9eb41898523ee209a0a937f9bcb78afe45ad55ca0556f8a4d4063558098f6d1e","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"0444c6991eead6822f7b9102e654448d51624431119546492e8b231db42c48bb","README.md":"d7f74d616a751bcca23d5d3b58a6daf556356a526c5f0b6aa0504715d176549a","build.rs":"23cbf4cf1b742e2c4da8bc58d06d1d021479dec80cec6a0bc3704c7172e2864a","rustfmt.toml":"e090969e99df9360705680cc0097cfaddae10c22dc2e01470592cf3b9787fd36","src/aes_hash.rs":"013602aec42150e59ba9ed6135525a624a4b42c1b1328b9857ec238aa12c3178","src/convert.rs":"54e49f93d51665366923d4d815cfd67790d3c769e84ab4386ba97f928d17d1bd","src/fallback_hash.rs":"a82451f6458a6e7a7e7da82a3c982e9bb825a2092ab79c41459d8011775fb0b1","src/hash_map.rs":"5ee97baa64fa528ba9c01bd018332c4974846c4813c6f8c30cee9f3546598f1c","src/hash_quality_test.rs":"1a560a181a804791bc6ad797df5352cdd87123fed7f19f659de0c2d883248bed","src/hash_set.rs":"360e55d066b44624f06e49efa140c03fda635fb17a59622cc29a83830bd1f263","src/lib.rs":"e2f4e7bfcf2807c73e3b8d3b1bd83c6789313b6b55edd59e15e04146e55e01b6","src/operations.rs":"38ed2b48a13d826c48ede5f304c9c2572c0c8f64ac8ac5a1ed4e112e536f3a97","src/random_state.rs":"03f40a654cfca2e00a2dabd21c85368ee50b8b6289efe98ea1745b25c721b9c6","src/specialize.rs":"56354db8a0f7e6ee1340a08f2ab6f79a0ff439fd61badac5e7e59fe4f4a653ba","tests/bench.rs":"7a425f564201560f9a8fb6c77f91f29bb88ec815b10bd27d15740c922a4f928e","tests/map_tests.rs":"e56b6f700e3b1176210e4b266d7a42b3263e966e5e565d53b1bc27af7a87168e","tests/nopanic.rs":"0d28a46248d77283941db1d9fd154c68b965c81a0e3db1fe4a43e06fc448da8f"},"package":"e89da841a80418a9b391ebaea17f5c112ffaaa96f621d2c285b5174da76b9011"}

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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
# will likely look very different (and much more reasonable).
# See Cargo.toml.orig for the original contents.
[package]
edition = "2018"
rust-version = "1.60.0"
name = "ahash"
version = "0.8.11"
authors = ["Tom Kaitchuck <Tom.Kaitchuck@gmail.com>"]
build = "./build.rs"
exclude = [
"/smhasher",
"/benchmark_tools",
]
description = "A non-cryptographic hash function using AES-NI for high performance"
documentation = "https://docs.rs/ahash"
readme = "README.md"
keywords = [
"hash",
"hasher",
"hashmap",
"aes",
"no-std",
]
categories = [
"algorithms",
"data-structures",
"no-std",
]
license = "MIT OR Apache-2.0"
repository = "https://github.com/tkaitchuck/ahash"
[package.metadata.docs.rs]
features = ["std"]
rustc-args = [
"-C",
"target-feature=+aes",
]
rustdoc-args = [
"-C",
"target-feature=+aes",
]
[profile.bench]
opt-level = 3
lto = "fat"
codegen-units = 1
debug = 0
debug-assertions = false
[profile.release]
opt-level = 3
lto = "fat"
codegen-units = 1
debug = 0
debug-assertions = false
[profile.test]
opt-level = 2
lto = "fat"
[lib]
name = "ahash"
path = "src/lib.rs"
test = true
doctest = true
bench = true
doc = true
[[bench]]
name = "ahash"
path = "tests/bench.rs"
harness = false
[[bench]]
name = "map"
path = "tests/map_tests.rs"
harness = false
[dependencies.atomic-polyfill]
version = "1.0.1"
optional = true
[dependencies.cfg-if]
version = "1.0"
[dependencies.const-random]
version = "0.1.17"
optional = true
[dependencies.getrandom]
version = "0.2.7"
optional = true
[dependencies.serde]
version = "1.0.117"
optional = true
[dependencies.zerocopy]
version = "0.7.31"
features = ["simd"]
default-features = false
[dev-dependencies.criterion]
version = "0.3.2"
features = ["html_reports"]
[dev-dependencies.fnv]
version = "1.0.5"
[dev-dependencies.fxhash]
version = "0.2.1"
[dev-dependencies.hashbrown]
version = "0.14.3"
[dev-dependencies.hex]
version = "0.4.2"
[dev-dependencies.no-panic]
version = "0.1.10"
[dev-dependencies.pcg-mwc]
version = "0.2.1"
[dev-dependencies.rand]
version = "0.8.5"
[dev-dependencies.seahash]
version = "4.0"
[dev-dependencies.serde_json]
version = "1.0.59"
[dev-dependencies.smallvec]
version = "1.13.1"
[build-dependencies.version_check]
version = "0.9.4"
[features]
atomic-polyfill = [
"dep:atomic-polyfill",
"once_cell/atomic-polyfill",
]
compile-time-rng = ["const-random"]
default = [
"std",
"runtime-rng",
]
nightly-arm-aes = []
no-rng = []
runtime-rng = ["getrandom"]
std = []
[target."cfg(not(all(target_arch = \"arm\", target_os = \"none\")))".dependencies.once_cell]
version = "1.18.0"
features = ["alloc"]
default-features = false

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## How does aHash prevent DOS attacks
AHash is designed to [prevent an adversary that does not know the key from being able to create hash collisions or partial collisions.](https://github.com/tkaitchuck/aHash/wiki/How-aHash-is-resists-DOS-attacks)
If you are a cryptographer and would like to help review aHash's algorithm, please post a comment [here](https://github.com/tkaitchuck/aHash/issues/11).
In short, this is achieved by ensuring that:
* aHash is designed to [resist differential crypto analysis](https://github.com/tkaitchuck/aHash/wiki/How-aHash-is-resists-DOS-attacks#differential-analysis). Meaning it should not be possible to devise a scheme to "cancel" out a modification of the internal state from a block of input via some corresponding change in a subsequent block of input.
* This is achieved by not performing any "premixing" - This reversible mixing gave previous hashes such as murmurhash confidence in their quality, but could be undone by a deliberate attack.
* Before it is used each chunk of input is "masked" such as by xoring it with an unpredictable value.
* aHash obeys the '[strict avalanche criterion](https://en.wikipedia.org/wiki/Avalanche_effect#Strict_avalanche_criterion)':
Each bit of input has the potential to flip every bit of the output.
* Similarly, each bit in the key can affect every bit in the output.
* Input bits never effect just one, or a very few, bits in intermediate state. This is specifically designed to prevent the sort of
[differential attacks launched by the sipHash authors](https://emboss.github.io/blog/2012/12/14/breaking-murmur-hash-flooding-dos-reloaded/) which cancel previous inputs.
* The `finish` call at the end of the hash is designed to not expose individual bits of the internal state.
* For example in the main algorithm 256bits of state and 256bits of keys are reduced to 64 total bits using 3 rounds of AES encryption.
Reversing this is more than non-trivial. Most of the information is by definition gone, and any given bit of the internal state is fully diffused across the output.
* In both aHash and its fallback the internal state is divided into two halves which are updated by two unrelated techniques using the same input. - This means that if there is a way to attack one of them it likely won't be able to attack both of them at the same time.
* It is deliberately difficult to 'chain' collisions. (This has been the major technique used to weaponize attacks on other hash functions)
More details are available on [the wiki](https://github.com/tkaitchuck/aHash/wiki/How-aHash-is-resists-DOS-attacks).
## Why not use a cryptographic hash in a hashmap.
Cryptographic hashes are designed to make is nearly impossible to find two items that collide when the attacker has full control
over the input. This has several implications:
* They are very difficult to construct, and have to go to a lot of effort to ensure that collisions are not possible.
* They have no notion of a 'key'. Rather, they are fully deterministic and provide exactly one hash for a given input.
For a HashMap the requirements are different.
* Speed is very important, especially for short inputs. Often the key for a HashMap is a single `u32` or similar, and to be effective
the bucket that it should be hashed to needs to be computed in just a few CPU cycles.
* A hashmap does not need to provide a hard and fast guarantee that no two inputs will ever collide. Hence, hashCodes are not 256bits
but are just 64 or 32 bits in length. Often the first thing done with the hashcode is to truncate it further to compute which among a few buckets should be used for a key.
* Here collisions are expected, and a cheap to deal with provided there is no systematic way to generated huge numbers of values that all
go to the same bucket.
* This also means that unlike a cryptographic hash partial collisions matter. It doesn't do a hashmap any good to produce a unique 256bit hash if
the lower 12 bits are all the same. This means that even a provably irreversible hash would not offer protection from a DOS attack in a hashmap
because an attacker can easily just brute force the bottom N bits.
From a cryptography point of view, a hashmap needs something closer to a block cypher.
Where the input can be quickly mixed in a way that cannot be reversed without knowing a key.
## Why isn't aHash cryptographically secure
It is not designed to be.
Attempting to use aHash as a secure hash will likely fail to hold up for several reasons:
1. aHash relies on random keys which are assumed to not be observable by an attacker. For a cryptographic hash all inputs can be seen and controlled by the attacker.
2. aHash has not yet gone through peer review, which is a pre-requisite for security critical algorithms.
3. Because aHash uses reduced rounds of AES as opposed to the standard of 10. Things like the SQUARE attack apply to part of the internal state.
(These are mitigated by other means to prevent producing collections, but would be a problem in other contexts).
4. Like any cypher based hash, it will show certain statistical deviations from truly random output when comparing a (VERY) large number of hashes.
(By definition cyphers have fewer collisions than truly random data.)
There are efforts to build a secure hash function that uses AES-NI for acceleration, but aHash is not one of them.
## How is aHash so fast
AHash uses a number of tricks.
One trick is taking advantage of specialization. If aHash is compiled on nightly it will take
advantage of specialized hash implementations for strings, slices, and primitives.
Another is taking advantage of hardware instructions.
When it is available aHash uses AES rounds using the AES-NI instruction. AES-NI is very fast (on an intel i7-6700 it
is as fast as a 64 bit multiplication.) and handles 16 bytes of input at a time, while being a very strong permutation.
This is obviously much faster than most standard approaches to hashing, and does a better job of scrambling data than most non-secure hashes.
On an intel i7-6700 compiled on nightly Rust with flags `-C opt-level=3 -C target-cpu=native -C codegen-units=1`:
| Input | SipHash 1-3 time | FnvHash time|FxHash time| aHash time| aHash Fallback* |
|----------------|-----------|-----------|-----------|-----------|---------------|
| u8 | 9.3271 ns | 0.808 ns | **0.594 ns** | 0.7704 ns | 0.7664 ns |
| u16 | 9.5139 ns | 0.803 ns | **0.594 ns** | 0.7653 ns | 0.7704 ns |
| u32 | 9.1196 ns | 1.4424 ns | **0.594 ns** | 0.7637 ns | 0.7712 ns |
| u64 | 10.854 ns | 3.0484 ns | **0.628 ns** | 0.7788 ns | 0.7888 ns |
| u128 | 12.465 ns | 7.0728 ns | 0.799 ns | **0.6174 ns** | 0.6250 ns |
| 1 byte string | 11.745 ns | 2.4743 ns | 2.4000 ns | **1.4921 ns** | 1.5861 ns |
| 3 byte string | 12.066 ns | 3.5221 ns | 2.9253 ns | **1.4745 ns** | 1.8518 ns |
| 4 byte string | 11.634 ns | 4.0770 ns | 1.8818 ns | **1.5206 ns** | 1.8924 ns |
| 7 byte string | 14.762 ns | 5.9780 ns | 3.2282 ns | **1.5207 ns** | 1.8933 ns |
| 8 byte string | 13.442 ns | 4.0535 ns | 2.9422 ns | **1.6262 ns** | 1.8929 ns |
| 15 byte string | 16.880 ns | 8.3434 ns | 4.6070 ns | **1.6265 ns** | 1.7965 ns |
| 16 byte string | 15.155 ns | 7.5796 ns | 3.2619 ns | **1.6262 ns** | 1.8011 ns |
| 24 byte string | 16.521 ns | 12.492 ns | 3.5424 ns | **1.6266 ns** | 2.8311 ns |
| 68 byte string | 24.598 ns | 50.715 ns | 5.8312 ns | **4.8282 ns** | 5.4824 ns |
| 132 byte string| 39.224 ns | 119.96 ns | 11.777 ns | **6.5087 ns** | 9.1459 ns |
|1024 byte string| 254.00 ns | 1087.3 ns | 156.41 ns | **25.402 ns** | 54.566 ns |
* Fallback refers to the algorithm aHash would use if AES instructions are unavailable.
For reference a hash that does nothing (not even reads the input data takes) **0.520 ns**. So that represents the fastest
possible time.
As you can see above aHash like `FxHash` provides a large speedup over `SipHash-1-3` which is already nearly twice as fast as `SipHash-2-4`.
Rust's HashMap by default uses `SipHash-1-3` because faster hash functions such as `FxHash` are predictable and vulnerable to denial of
service attacks. While `aHash` has both very strong scrambling and very high performance.
AHash performs well when dealing with large inputs because aHash reads 8 or 16 bytes at a time. (depending on availability of AES-NI)
Because of this, and its optimized logic, `aHash` is able to outperform `FxHash` with strings.
It also provides especially good performance dealing with unaligned input.
(Notice the big performance gaps between 3 vs 4, 7 vs 8 and 15 vs 16 in `FxHash` above)
### Which CPUs can use the hardware acceleration
Hardware AES instructions are built into Intel processors built after 2010 and AMD processors after 2012.
It is also available on [many other CPUs](https://en.wikipedia.org/wiki/AES_instruction_set) should in eventually
be able to get aHash to work. However, only X86 and X86-64 are the only supported architectures at the moment, as currently
they are the only architectures for which Rust provides an intrinsic.
aHash also uses `sse2` and `sse3` instructions. X86 processors that have `aesni` also have these instruction sets.

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Copyright (c) 2018 Tom Kaitchuck
Permission is hereby granted, free of charge, to any
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# aHash ![Build Status](https://img.shields.io/github/actions/workflow/status/tkaitchuck/aHash/rust.yml?branch=master) ![Licence](https://img.shields.io/crates/l/ahash) ![Downloads](https://img.shields.io/crates/d/ahash)
AHash is the [fastest](https://github.com/tkaitchuck/aHash/blob/master/compare/readme.md#Speed),
[DOS resistant hash](https://github.com/tkaitchuck/aHash/wiki/How-aHash-is-resists-DOS-attacks) currently available in Rust.
AHash is intended *exclusively* for use in in-memory hashmaps.
AHash's output is of [high quality](https://github.com/tkaitchuck/aHash/blob/master/compare/readme.md#Quality) but aHash is **not** a cryptographically secure hash.
## Design
Because AHash is a keyed hash, each map will produce completely different hashes, which cannot be predicted without knowing the keys.
[This prevents DOS attacks where an attacker sends a large number of items whose hashes collide that get used as keys in a hashmap.](https://github.com/tkaitchuck/aHash/wiki/How-aHash-is-resists-DOS-attacks)
This also avoids [accidentally quadratic behavior by reading from one map and writing to another.](https://accidentallyquadratic.tumblr.com/post/153545455987/rust-hash-iteration-reinsertion)
## Goals and Non-Goals
AHash does *not* have a fixed standard for its output. This allows it to improve over time. For example,
if any faster algorithm is found, aHash will be updated to incorporate the technique.
Similarly, should any flaw in aHash's DOS resistance be found, aHash will be changed to correct the flaw.
Because it does not have a fixed standard, different computers or computers on different versions of the code will observe different hash values.
As such, aHash is not recommended for use other than in-memory maps. Specifically, aHash is not intended for network use or in applications which persist hashed values.
(In these cases `HighwayHash` would be a better choice)
Additionally, aHash is not intended to be cryptographically secure and should not be used as a MAC, or anywhere which requires a cryptographically secure hash.
(In these cases `SHA-3` would be a better choice)
## Usage
AHash is a drop in replacement for the default implementation of the `Hasher` trait. To construct a `HashMap` using aHash
as its hasher do the following:
```rust
use ahash::{AHasher, RandomState};
use std::collections::HashMap;
let mut map: HashMap<i32, i32, RandomState> = HashMap::default();
map.insert(12, 34);
```
For convenience, wrappers called `AHashMap` and `AHashSet` are also provided.
These do the same thing with slightly less typing.
```rust
use ahash::AHashMap;
let mut map: AHashMap<i32, i32> = AHashMap::new();
map.insert(12, 34);
map.insert(56, 78);
```
## Flags
The aHash package has the following flags:
* `std`: This enables features which require the standard library. (On by default) This includes providing the utility classes `AHashMap` and `AHashSet`.
* `serde`: Enables `serde` support for the utility classes `AHashMap` and `AHashSet`.
* `runtime-rng`: To obtain a seed for Hashers will obtain randomness from the operating system. (On by default)
This is done using the [getrandom](https://github.com/rust-random/getrandom) crate.
* `compile-time-rng`: For OS targets without access to a random number generator, `compile-time-rng` provides an alternative.
If `getrandom` is unavailable and `compile-time-rng` is enabled, aHash will generate random numbers at compile time and embed them in the binary.
* `nightly-arm-aes`: To use AES instructions on 32-bit ARM, which requires nightly. This is not needed on AArch64.
This allows for DOS resistance even if there is no random number generator available at runtime (assuming the compiled binary is not public).
This makes the binary non-deterministic. (If non-determinism is a problem see [constrandom's documentation](https://github.com/tkaitchuck/constrandom#deterministic-builds))
If both `runtime-rng` and `compile-time-rng` are enabled the `runtime-rng` will take precedence and `compile-time-rng` will do nothing.
If neither flag is set, seeds can be supplied by the application. [Multiple apis](https://docs.rs/ahash/latest/ahash/random_state/struct.RandomState.html)
are available to do this.
## Comparison with other hashers
A full comparison with other hashing algorithms can be found [here](https://github.com/tkaitchuck/aHash/blob/master/compare/readme.md)
![Hasher performance](https://docs.google.com/spreadsheets/d/e/2PACX-1vSK7Li2nS-Bur9arAYF9IfT37MP-ohAe1v19lZu5fd9MajI1fSveLAQZyEie4Ea9k5-SWHTff7nL2DW/pubchart?oid=1323618938&format=image)
For a more representative performance comparison which includes the overhead of using a HashMap, see [HashBrown's benchmarks](https://github.com/rust-lang/hashbrown#performance)
as HashBrown now uses aHash as its hasher by default.
## Hash quality
AHash passes the full [SMHasher test suite](https://github.com/rurban/smhasher).
The code to reproduce the result, and the full output [are checked into the repo](https://github.com/tkaitchuck/aHash/tree/master/smhasher).
## Additional FAQ
A separate FAQ document is maintained [here](https://github.com/tkaitchuck/aHash/blob/master/FAQ.md).
If you have questions not covered there, open an issue [here](https://github.com/tkaitchuck/aHash/issues).
## License
Licensed under either of:
* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
at your option.
## Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any
additional terms or conditions.

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#![deny(warnings)]
use std::env;
fn main() {
println!("cargo:rerun-if-changed=build.rs");
if let Some(true) = version_check::supports_feature("specialize") {
println!("cargo:rustc-cfg=feature=\"specialize\"");
}
let arch = env::var("CARGO_CFG_TARGET_ARCH").expect("CARGO_CFG_TARGET_ARCH was not set");
if arch.eq_ignore_ascii_case("x86_64")
|| arch.eq_ignore_ascii_case("aarch64")
|| arch.eq_ignore_ascii_case("mips64")
|| arch.eq_ignore_ascii_case("powerpc64")
|| arch.eq_ignore_ascii_case("riscv64gc")
|| arch.eq_ignore_ascii_case("s390x")
{
println!("cargo:rustc-cfg=feature=\"folded_multiply\"");
}
}

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max_width = 120

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use crate::convert::*;
use crate::operations::*;
use crate::random_state::PI;
use crate::RandomState;
use core::hash::Hasher;
/// A `Hasher` for hashing an arbitrary stream of bytes.
///
/// Instances of [`AHasher`] represent state that is updated while hashing data.
///
/// Each method updates the internal state based on the new data provided. Once
/// all of the data has been provided, the resulting hash can be obtained by calling
/// `finish()`
///
/// [Clone] is also provided in case you wish to calculate hashes for two different items that
/// start with the same data.
///
#[derive(Debug, Clone)]
pub struct AHasher {
enc: u128,
sum: u128,
key: u128,
}
impl AHasher {
/// Creates a new hasher keyed to the provided keys.
///
/// Normally hashers are created via `AHasher::default()` for fixed keys or `RandomState::new()` for randomly
/// generated keys and `RandomState::with_seeds(a,b)` for seeds that are set and can be reused. All of these work at
/// map creation time (and hence don't have any overhead on a per-item bais).
///
/// This method directly creates the hasher instance and performs no transformation on the provided seeds. This may
/// be useful where a HashBuilder is not desired, such as for testing purposes.
///
/// # Example
///
/// ```
/// use std::hash::Hasher;
/// use ahash::AHasher;
///
/// let mut hasher = AHasher::new_with_keys(1234, 5678);
///
/// hasher.write_u32(1989);
/// hasher.write_u8(11);
/// hasher.write_u8(9);
/// hasher.write(b"Huh?");
///
/// println!("Hash is {:x}!", hasher.finish());
/// ```
#[inline]
pub(crate) fn new_with_keys(key1: u128, key2: u128) -> Self {
let pi: [u128; 2] = PI.convert();
let key1 = key1 ^ pi[0];
let key2 = key2 ^ pi[1];
Self {
enc: key1,
sum: key2,
key: key1 ^ key2,
}
}
#[allow(unused)] // False positive
pub(crate) fn test_with_keys(key1: u128, key2: u128) -> Self {
Self {
enc: key1,
sum: key2,
key: key1 ^ key2,
}
}
#[inline]
pub(crate) fn from_random_state(rand_state: &RandomState) -> Self {
let key1 = [rand_state.k0, rand_state.k1].convert();
let key2 = [rand_state.k2, rand_state.k3].convert();
Self {
enc: key1,
sum: key2,
key: key1 ^ key2,
}
}
#[inline(always)]
fn hash_in(&mut self, new_value: u128) {
self.enc = aesdec(self.enc, new_value);
self.sum = shuffle_and_add(self.sum, new_value);
}
#[inline(always)]
fn hash_in_2(&mut self, v1: u128, v2: u128) {
self.enc = aesdec(self.enc, v1);
self.sum = shuffle_and_add(self.sum, v1);
self.enc = aesdec(self.enc, v2);
self.sum = shuffle_and_add(self.sum, v2);
}
#[inline]
#[cfg(feature = "specialize")]
fn short_finish(&self) -> u64 {
let combined = aesenc(self.sum, self.enc);
let result: [u64; 2] = aesdec(combined, combined).convert();
result[0]
}
}
/// Provides [Hasher] methods to hash all of the primitive types.
///
/// [Hasher]: core::hash::Hasher
impl Hasher for AHasher {
#[inline]
fn write_u8(&mut self, i: u8) {
self.write_u64(i as u64);
}
#[inline]
fn write_u16(&mut self, i: u16) {
self.write_u64(i as u64);
}
#[inline]
fn write_u32(&mut self, i: u32) {
self.write_u64(i as u64);
}
#[inline]
fn write_u128(&mut self, i: u128) {
self.hash_in(i);
}
#[inline]
#[cfg(any(
target_pointer_width = "64",
target_pointer_width = "32",
target_pointer_width = "16"
))]
fn write_usize(&mut self, i: usize) {
self.write_u64(i as u64);
}
#[inline]
#[cfg(target_pointer_width = "128")]
fn write_usize(&mut self, i: usize) {
self.write_u128(i as u128);
}
#[inline]
fn write_u64(&mut self, i: u64) {
self.write_u128(i as u128);
}
#[inline]
#[allow(clippy::collapsible_if)]
fn write(&mut self, input: &[u8]) {
let mut data = input;
let length = data.len();
add_in_length(&mut self.enc, length as u64);
//A 'binary search' on sizes reduces the number of comparisons.
if data.len() <= 8 {
let value = read_small(data);
self.hash_in(value.convert());
} else {
if data.len() > 32 {
if data.len() > 64 {
let tail = data.read_last_u128x4();
let mut current: [u128; 4] = [self.key; 4];
current[0] = aesenc(current[0], tail[0]);
current[1] = aesdec(current[1], tail[1]);
current[2] = aesenc(current[2], tail[2]);
current[3] = aesdec(current[3], tail[3]);
let mut sum: [u128; 2] = [self.key, !self.key];
sum[0] = add_by_64s(sum[0].convert(), tail[0].convert()).convert();
sum[1] = add_by_64s(sum[1].convert(), tail[1].convert()).convert();
sum[0] = shuffle_and_add(sum[0], tail[2]);
sum[1] = shuffle_and_add(sum[1], tail[3]);
while data.len() > 64 {
let (blocks, rest) = data.read_u128x4();
current[0] = aesdec(current[0], blocks[0]);
current[1] = aesdec(current[1], blocks[1]);
current[2] = aesdec(current[2], blocks[2]);
current[3] = aesdec(current[3], blocks[3]);
sum[0] = shuffle_and_add(sum[0], blocks[0]);
sum[1] = shuffle_and_add(sum[1], blocks[1]);
sum[0] = shuffle_and_add(sum[0], blocks[2]);
sum[1] = shuffle_and_add(sum[1], blocks[3]);
data = rest;
}
self.hash_in_2(current[0], current[1]);
self.hash_in_2(current[2], current[3]);
self.hash_in_2(sum[0], sum[1]);
} else {
//len 33-64
let (head, _) = data.read_u128x2();
let tail = data.read_last_u128x2();
self.hash_in_2(head[0], head[1]);
self.hash_in_2(tail[0], tail[1]);
}
} else {
if data.len() > 16 {
//len 17-32
self.hash_in_2(data.read_u128().0, data.read_last_u128());
} else {
//len 9-16
let value: [u64; 2] = [data.read_u64().0, data.read_last_u64()];
self.hash_in(value.convert());
}
}
}
}
#[inline]
fn finish(&self) -> u64 {
let combined = aesenc(self.sum, self.enc);
let result: [u64; 2] = aesdec(aesdec(combined, self.key), combined).convert();
result[0]
}
}
#[cfg(feature = "specialize")]
pub(crate) struct AHasherU64 {
pub(crate) buffer: u64,
pub(crate) pad: u64,
}
/// A specialized hasher for only primitives under 64 bits.
#[cfg(feature = "specialize")]
impl Hasher for AHasherU64 {
#[inline]
fn finish(&self) -> u64 {
folded_multiply(self.buffer, self.pad)
}
#[inline]
fn write(&mut self, _bytes: &[u8]) {
unreachable!("Specialized hasher was called with a different type of object")
}
#[inline]
fn write_u8(&mut self, i: u8) {
self.write_u64(i as u64);
}
#[inline]
fn write_u16(&mut self, i: u16) {
self.write_u64(i as u64);
}
#[inline]
fn write_u32(&mut self, i: u32) {
self.write_u64(i as u64);
}
#[inline]
fn write_u64(&mut self, i: u64) {
self.buffer = folded_multiply(i ^ self.buffer, MULTIPLE);
}
#[inline]
fn write_u128(&mut self, _i: u128) {
unreachable!("Specialized hasher was called with a different type of object")
}
#[inline]
fn write_usize(&mut self, _i: usize) {
unreachable!("Specialized hasher was called with a different type of object")
}
}
#[cfg(feature = "specialize")]
pub(crate) struct AHasherFixed(pub AHasher);
/// A specialized hasher for fixed size primitives larger than 64 bits.
#[cfg(feature = "specialize")]
impl Hasher for AHasherFixed {
#[inline]
fn finish(&self) -> u64 {
self.0.short_finish()
}
#[inline]
fn write(&mut self, bytes: &[u8]) {
self.0.write(bytes)
}
#[inline]
fn write_u8(&mut self, i: u8) {
self.write_u64(i as u64);
}
#[inline]
fn write_u16(&mut self, i: u16) {
self.write_u64(i as u64);
}
#[inline]
fn write_u32(&mut self, i: u32) {
self.write_u64(i as u64);
}
#[inline]
fn write_u64(&mut self, i: u64) {
self.0.write_u64(i);
}
#[inline]
fn write_u128(&mut self, i: u128) {
self.0.write_u128(i);
}
#[inline]
fn write_usize(&mut self, i: usize) {
self.0.write_usize(i);
}
}
#[cfg(feature = "specialize")]
pub(crate) struct AHasherStr(pub AHasher);
/// A specialized hasher for strings
/// Note that the other types don't panic because the hash impl for String tacks on an unneeded call. (As does vec)
#[cfg(feature = "specialize")]
impl Hasher for AHasherStr {
#[inline]
fn finish(&self) -> u64 {
let result: [u64; 2] = self.0.enc.convert();
result[0]
}
#[inline]
fn write(&mut self, bytes: &[u8]) {
if bytes.len() > 8 {
self.0.write(bytes);
self.0.enc = aesenc(self.0.sum, self.0.enc);
self.0.enc = aesdec(aesdec(self.0.enc, self.0.key), self.0.enc);
} else {
add_in_length(&mut self.0.enc, bytes.len() as u64);
let value = read_small(bytes).convert();
self.0.sum = shuffle_and_add(self.0.sum, value);
self.0.enc = aesenc(self.0.sum, self.0.enc);
self.0.enc = aesdec(aesdec(self.0.enc, self.0.key), self.0.enc);
}
}
#[inline]
fn write_u8(&mut self, _i: u8) {}
#[inline]
fn write_u16(&mut self, _i: u16) {}
#[inline]
fn write_u32(&mut self, _i: u32) {}
#[inline]
fn write_u64(&mut self, _i: u64) {}
#[inline]
fn write_u128(&mut self, _i: u128) {}
#[inline]
fn write_usize(&mut self, _i: usize) {}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::convert::Convert;
use crate::operations::aesenc;
use crate::RandomState;
use std::hash::{BuildHasher, Hasher};
#[test]
fn test_sanity() {
let mut hasher = RandomState::with_seeds(1, 2, 3, 4).build_hasher();
hasher.write_u64(0);
let h1 = hasher.finish();
hasher.write(&[1, 0, 0, 0, 0, 0, 0, 0]);
let h2 = hasher.finish();
assert_ne!(h1, h2);
}
#[cfg(feature = "compile-time-rng")]
#[test]
fn test_builder() {
use std::collections::HashMap;
use std::hash::BuildHasherDefault;
let mut map = HashMap::<u32, u64, BuildHasherDefault<AHasher>>::default();
map.insert(1, 3);
}
#[cfg(feature = "compile-time-rng")]
#[test]
fn test_default() {
let hasher_a = AHasher::default();
let a_enc: [u64; 2] = hasher_a.enc.convert();
let a_sum: [u64; 2] = hasher_a.sum.convert();
assert_ne!(0, a_enc[0]);
assert_ne!(0, a_enc[1]);
assert_ne!(0, a_sum[0]);
assert_ne!(0, a_sum[1]);
assert_ne!(a_enc[0], a_enc[1]);
assert_ne!(a_sum[0], a_sum[1]);
assert_ne!(a_enc[0], a_sum[0]);
assert_ne!(a_enc[1], a_sum[1]);
let hasher_b = AHasher::default();
let b_enc: [u64; 2] = hasher_b.enc.convert();
let b_sum: [u64; 2] = hasher_b.sum.convert();
assert_eq!(a_enc[0], b_enc[0]);
assert_eq!(a_enc[1], b_enc[1]);
assert_eq!(a_sum[0], b_sum[0]);
assert_eq!(a_sum[1], b_sum[1]);
}
#[test]
fn test_hash() {
let mut result: [u64; 2] = [0x6c62272e07bb0142, 0x62b821756295c58d];
let value: [u64; 2] = [1 << 32, 0xFEDCBA9876543210];
result = aesenc(value.convert(), result.convert()).convert();
result = aesenc(result.convert(), result.convert()).convert();
let mut result2: [u64; 2] = [0x6c62272e07bb0142, 0x62b821756295c58d];
let value2: [u64; 2] = [1, 0xFEDCBA9876543210];
result2 = aesenc(value2.convert(), result2.convert()).convert();
result2 = aesenc(result2.convert(), result.convert()).convert();
let result: [u8; 16] = result.convert();
let result2: [u8; 16] = result2.convert();
assert_ne!(hex::encode(result), hex::encode(result2));
}
#[test]
fn test_conversion() {
let input: &[u8] = "dddddddd".as_bytes();
let bytes: u64 = as_array!(input, 8).convert();
assert_eq!(bytes, 0x6464646464646464);
}
}

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pub(crate) trait Convert<To> {
fn convert(self) -> To;
}
macro_rules! convert {
($a:ty, $b:ty) => {
impl Convert<$b> for $a {
#[inline(always)]
fn convert(self) -> $b {
zerocopy::transmute!(self)
}
}
impl Convert<$a> for $b {
#[inline(always)]
fn convert(self) -> $a {
zerocopy::transmute!(self)
}
}
};
}
convert!([u128; 4], [u64; 8]);
convert!([u128; 4], [u32; 16]);
convert!([u128; 4], [u16; 32]);
convert!([u128; 4], [u8; 64]);
convert!([u128; 2], [u64; 4]);
convert!([u128; 2], [u32; 8]);
convert!([u128; 2], [u16; 16]);
convert!([u128; 2], [u8; 32]);
convert!(u128, [u64; 2]);
convert!(u128, [u32; 4]);
convert!(u128, [u16; 8]);
convert!(u128, [u8; 16]);
convert!([u64; 8], [u32; 16]);
convert!([u64; 8], [u16; 32]);
convert!([u64; 8], [u8; 64]);
convert!([u64; 4], [u32; 8]);
convert!([u64; 4], [u16; 16]);
convert!([u64; 4], [u8; 32]);
convert!([u64; 2], [u32; 4]);
convert!([u64; 2], [u16; 8]);
convert!([u64; 2], [u8; 16]);
convert!([u32; 4], [u16; 8]);
convert!([u32; 4], [u8; 16]);
convert!([u16; 8], [u8; 16]);
convert!(u64, [u32; 2]);
convert!(u64, [u16; 4]);
convert!(u64, [u8; 8]);
convert!([u32; 2], [u16; 4]);
convert!([u32; 2], [u8; 8]);
convert!(u32, [u16; 2]);
convert!(u32, [u8; 4]);
convert!([u16; 2], [u8; 4]);
convert!(u16, [u8; 2]);
convert!([[u64; 4]; 2], [u8; 64]);
convert!([f64; 2], [u8; 16]);
convert!([f32; 4], [u8; 16]);
convert!(f64, [u8; 8]);
convert!([f32; 2], [u8; 8]);
convert!(f32, [u8; 4]);
macro_rules! as_array {
($input:expr, $len:expr) => {{
{
#[inline(always)]
fn as_array<T>(slice: &[T]) -> &[T; $len] {
core::convert::TryFrom::try_from(slice).unwrap()
}
as_array($input)
}
}};
}
pub(crate) trait ReadFromSlice {
fn read_u16(&self) -> (u16, &[u8]);
fn read_u32(&self) -> (u32, &[u8]);
fn read_u64(&self) -> (u64, &[u8]);
fn read_u128(&self) -> (u128, &[u8]);
fn read_u128x2(&self) -> ([u128; 2], &[u8]);
fn read_u128x4(&self) -> ([u128; 4], &[u8]);
fn read_last_u16(&self) -> u16;
fn read_last_u32(&self) -> u32;
fn read_last_u64(&self) -> u64;
fn read_last_u128(&self) -> u128;
fn read_last_u128x2(&self) -> [u128; 2];
fn read_last_u128x4(&self) -> [u128; 4];
}
impl ReadFromSlice for [u8] {
#[inline(always)]
fn read_u16(&self) -> (u16, &[u8]) {
let (value, rest) = self.split_at(2);
(as_array!(value, 2).convert(), rest)
}
#[inline(always)]
fn read_u32(&self) -> (u32, &[u8]) {
let (value, rest) = self.split_at(4);
(as_array!(value, 4).convert(), rest)
}
#[inline(always)]
fn read_u64(&self) -> (u64, &[u8]) {
let (value, rest) = self.split_at(8);
(as_array!(value, 8).convert(), rest)
}
#[inline(always)]
fn read_u128(&self) -> (u128, &[u8]) {
let (value, rest) = self.split_at(16);
(as_array!(value, 16).convert(), rest)
}
#[inline(always)]
fn read_u128x2(&self) -> ([u128; 2], &[u8]) {
let (value, rest) = self.split_at(32);
(as_array!(value, 32).convert(), rest)
}
#[inline(always)]
fn read_u128x4(&self) -> ([u128; 4], &[u8]) {
let (value, rest) = self.split_at(64);
(as_array!(value, 64).convert(), rest)
}
#[inline(always)]
fn read_last_u16(&self) -> u16 {
let (_, value) = self.split_at(self.len() - 2);
as_array!(value, 2).convert()
}
#[inline(always)]
fn read_last_u32(&self) -> u32 {
let (_, value) = self.split_at(self.len() - 4);
as_array!(value, 4).convert()
}
#[inline(always)]
fn read_last_u64(&self) -> u64 {
let (_, value) = self.split_at(self.len() - 8);
as_array!(value, 8).convert()
}
#[inline(always)]
fn read_last_u128(&self) -> u128 {
let (_, value) = self.split_at(self.len() - 16);
as_array!(value, 16).convert()
}
#[inline(always)]
fn read_last_u128x2(&self) -> [u128; 2] {
let (_, value) = self.split_at(self.len() - 32);
as_array!(value, 32).convert()
}
#[inline(always)]
fn read_last_u128x4(&self) -> [u128; 4] {
let (_, value) = self.split_at(self.len() - 64);
as_array!(value, 64).convert()
}
}

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use crate::convert::*;
use crate::operations::folded_multiply;
use crate::operations::read_small;
use crate::operations::MULTIPLE;
use crate::random_state::PI;
use crate::RandomState;
use core::hash::Hasher;
const ROT: u32 = 23; //17
/// A `Hasher` for hashing an arbitrary stream of bytes.
///
/// Instances of [`AHasher`] represent state that is updated while hashing data.
///
/// Each method updates the internal state based on the new data provided. Once
/// all of the data has been provided, the resulting hash can be obtained by calling
/// `finish()`
///
/// [Clone] is also provided in case you wish to calculate hashes for two different items that
/// start with the same data.
///
#[derive(Debug, Clone)]
pub struct AHasher {
buffer: u64,
pad: u64,
extra_keys: [u64; 2],
}
impl AHasher {
/// Creates a new hasher keyed to the provided key.
#[inline]
#[allow(dead_code)] // Is not called if non-fallback hash is used.
pub(crate) fn new_with_keys(key1: u128, key2: u128) -> AHasher {
let pi: [u128; 2] = PI.convert();
let key1: [u64; 2] = (key1 ^ pi[0]).convert();
let key2: [u64; 2] = (key2 ^ pi[1]).convert();
AHasher {
buffer: key1[0],
pad: key1[1],
extra_keys: key2,
}
}
#[allow(unused)] // False positive
pub(crate) fn test_with_keys(key1: u128, key2: u128) -> Self {
let key1: [u64; 2] = key1.convert();
let key2: [u64; 2] = key2.convert();
Self {
buffer: key1[0],
pad: key1[1],
extra_keys: key2,
}
}
#[inline]
#[allow(dead_code)] // Is not called if non-fallback hash is used.
pub(crate) fn from_random_state(rand_state: &RandomState) -> AHasher {
AHasher {
buffer: rand_state.k1,
pad: rand_state.k0,
extra_keys: [rand_state.k2, rand_state.k3],
}
}
/// This update function has the goal of updating the buffer with a single multiply
/// FxHash does this but is vulnerable to attack. To avoid this input needs to be masked to with an
/// unpredictable value. Other hashes such as murmurhash have taken this approach but were found vulnerable
/// to attack. The attack was based on the idea of reversing the pre-mixing (Which is necessarily
/// reversible otherwise bits would be lost) then placing a difference in the highest bit before the
/// multiply used to mix the data. Because a multiply can never affect the bits to the right of it, a
/// subsequent update that also differed in this bit could result in a predictable collision.
///
/// This version avoids this vulnerability while still only using a single multiply. It takes advantage
/// of the fact that when a 64 bit multiply is performed the upper 64 bits are usually computed and thrown
/// away. Instead it creates two 128 bit values where the upper 64 bits are zeros and multiplies them.
/// (The compiler is smart enough to turn this into a 64 bit multiplication in the assembly)
/// Then the upper bits are xored with the lower bits to produce a single 64 bit result.
///
/// To understand why this is a good scrambling function it helps to understand multiply-with-carry PRNGs:
/// https://en.wikipedia.org/wiki/Multiply-with-carry_pseudorandom_number_generator
/// If the multiple is chosen well, this creates a long period, decent quality PRNG.
/// Notice that this function is equivalent to this except the `buffer`/`state` is being xored with each
/// new block of data. In the event that data is all zeros, it is exactly equivalent to a MWC PRNG.
///
/// This is impervious to attack because every bit buffer at the end is dependent on every bit in
/// `new_data ^ buffer`. For example suppose two inputs differed in only the 5th bit. Then when the
/// multiplication is performed the `result` will differ in bits 5-69. More specifically it will differ by
/// 2^5 * MULTIPLE. However in the next step bits 65-128 are turned into a separate 64 bit value. So the
/// differing bits will be in the lower 6 bits of this value. The two intermediate values that differ in
/// bits 5-63 and in bits 0-5 respectively get added together. Producing an output that differs in every
/// bit. The addition carries in the multiplication and at the end additionally mean that the even if an
/// attacker somehow knew part of (but not all) the contents of the buffer before hand,
/// they would not be able to predict any of the bits in the buffer at the end.
#[inline(always)]
fn update(&mut self, new_data: u64) {
self.buffer = folded_multiply(new_data ^ self.buffer, MULTIPLE);
}
/// Similar to the above this function performs an update using a "folded multiply".
/// However it takes in 128 bits of data instead of 64. Both halves must be masked.
///
/// This makes it impossible for an attacker to place a single bit difference between
/// two blocks so as to cancel each other.
///
/// However this is not sufficient. to prevent (a,b) from hashing the same as (b,a) the buffer itself must
/// be updated between calls in a way that does not commute. To achieve this XOR and Rotate are used.
/// Add followed by xor is not the same as xor followed by add, and rotate ensures that the same out bits
/// can't be changed by the same set of input bits. To cancel this sequence with subsequent input would require
/// knowing the keys.
#[inline(always)]
fn large_update(&mut self, new_data: u128) {
let block: [u64; 2] = new_data.convert();
let combined = folded_multiply(block[0] ^ self.extra_keys[0], block[1] ^ self.extra_keys[1]);
self.buffer = (self.buffer.wrapping_add(self.pad) ^ combined).rotate_left(ROT);
}
#[inline]
#[cfg(feature = "specialize")]
fn short_finish(&self) -> u64 {
folded_multiply(self.buffer, self.pad)
}
}
/// Provides [Hasher] methods to hash all of the primitive types.
///
/// [Hasher]: core::hash::Hasher
impl Hasher for AHasher {
#[inline]
fn write_u8(&mut self, i: u8) {
self.update(i as u64);
}
#[inline]
fn write_u16(&mut self, i: u16) {
self.update(i as u64);
}
#[inline]
fn write_u32(&mut self, i: u32) {
self.update(i as u64);
}
#[inline]
fn write_u64(&mut self, i: u64) {
self.update(i as u64);
}
#[inline]
fn write_u128(&mut self, i: u128) {
self.large_update(i);
}
#[inline]
#[cfg(any(
target_pointer_width = "64",
target_pointer_width = "32",
target_pointer_width = "16"
))]
fn write_usize(&mut self, i: usize) {
self.write_u64(i as u64);
}
#[inline]
#[cfg(target_pointer_width = "128")]
fn write_usize(&mut self, i: usize) {
self.write_u128(i as u128);
}
#[inline]
#[allow(clippy::collapsible_if)]
fn write(&mut self, input: &[u8]) {
let mut data = input;
let length = data.len() as u64;
//Needs to be an add rather than an xor because otherwise it could be canceled with carefully formed input.
self.buffer = self.buffer.wrapping_add(length).wrapping_mul(MULTIPLE);
//A 'binary search' on sizes reduces the number of comparisons.
if data.len() > 8 {
if data.len() > 16 {
let tail = data.read_last_u128();
self.large_update(tail);
while data.len() > 16 {
let (block, rest) = data.read_u128();
self.large_update(block);
data = rest;
}
} else {
self.large_update([data.read_u64().0, data.read_last_u64()].convert());
}
} else {
let value = read_small(data);
self.large_update(value.convert());
}
}
#[inline]
fn finish(&self) -> u64 {
let rot = (self.buffer & 63) as u32;
folded_multiply(self.buffer, self.pad).rotate_left(rot)
}
}
#[cfg(feature = "specialize")]
pub(crate) struct AHasherU64 {
pub(crate) buffer: u64,
pub(crate) pad: u64,
}
/// A specialized hasher for only primitives under 64 bits.
#[cfg(feature = "specialize")]
impl Hasher for AHasherU64 {
#[inline]
fn finish(&self) -> u64 {
folded_multiply(self.buffer, self.pad)
//self.buffer
}
#[inline]
fn write(&mut self, _bytes: &[u8]) {
unreachable!("Specialized hasher was called with a different type of object")
}
#[inline]
fn write_u8(&mut self, i: u8) {
self.write_u64(i as u64);
}
#[inline]
fn write_u16(&mut self, i: u16) {
self.write_u64(i as u64);
}
#[inline]
fn write_u32(&mut self, i: u32) {
self.write_u64(i as u64);
}
#[inline]
fn write_u64(&mut self, i: u64) {
self.buffer = folded_multiply(i ^ self.buffer, MULTIPLE);
}
#[inline]
fn write_u128(&mut self, _i: u128) {
unreachable!("Specialized hasher was called with a different type of object")
}
#[inline]
fn write_usize(&mut self, _i: usize) {
unreachable!("Specialized hasher was called with a different type of object")
}
}
#[cfg(feature = "specialize")]
pub(crate) struct AHasherFixed(pub AHasher);
/// A specialized hasher for fixed size primitives larger than 64 bits.
#[cfg(feature = "specialize")]
impl Hasher for AHasherFixed {
#[inline]
fn finish(&self) -> u64 {
self.0.short_finish()
}
#[inline]
fn write(&mut self, bytes: &[u8]) {
self.0.write(bytes)
}
#[inline]
fn write_u8(&mut self, i: u8) {
self.write_u64(i as u64);
}
#[inline]
fn write_u16(&mut self, i: u16) {
self.write_u64(i as u64);
}
#[inline]
fn write_u32(&mut self, i: u32) {
self.write_u64(i as u64);
}
#[inline]
fn write_u64(&mut self, i: u64) {
self.0.write_u64(i);
}
#[inline]
fn write_u128(&mut self, i: u128) {
self.0.write_u128(i);
}
#[inline]
fn write_usize(&mut self, i: usize) {
self.0.write_usize(i);
}
}
#[cfg(feature = "specialize")]
pub(crate) struct AHasherStr(pub AHasher);
/// A specialized hasher for a single string
/// Note that the other types don't panic because the hash impl for String tacks on an unneeded call. (As does vec)
#[cfg(feature = "specialize")]
impl Hasher for AHasherStr {
#[inline]
fn finish(&self) -> u64 {
self.0.finish()
}
#[inline]
fn write(&mut self, bytes: &[u8]) {
if bytes.len() > 8 {
self.0.write(bytes)
} else {
let value = read_small(bytes);
self.0.buffer = folded_multiply(value[0] ^ self.0.buffer, value[1] ^ self.0.extra_keys[1]);
self.0.pad = self.0.pad.wrapping_add(bytes.len() as u64);
}
}
#[inline]
fn write_u8(&mut self, _i: u8) {}
#[inline]
fn write_u16(&mut self, _i: u16) {}
#[inline]
fn write_u32(&mut self, _i: u32) {}
#[inline]
fn write_u64(&mut self, _i: u64) {}
#[inline]
fn write_u128(&mut self, _i: u128) {}
#[inline]
fn write_usize(&mut self, _i: usize) {}
}
#[cfg(test)]
mod tests {
use crate::fallback_hash::*;
#[test]
fn test_hash() {
let mut hasher = AHasher::new_with_keys(0, 0);
let value: u64 = 1 << 32;
hasher.update(value);
let result = hasher.buffer;
let mut hasher = AHasher::new_with_keys(0, 0);
let value2: u64 = 1;
hasher.update(value2);
let result2 = hasher.buffer;
let result: [u8; 8] = result.convert();
let result2: [u8; 8] = result2.convert();
assert_ne!(hex::encode(result), hex::encode(result2));
}
#[test]
fn test_conversion() {
let input: &[u8] = "dddddddd".as_bytes();
let bytes: u64 = as_array!(input, 8).convert();
assert_eq!(bytes, 0x6464646464646464);
}
}

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use std::borrow::Borrow;
use std::collections::hash_map::{IntoKeys, IntoValues};
use std::collections::{hash_map, HashMap};
use std::fmt::{self, Debug};
use std::hash::{BuildHasher, Hash};
use std::iter::FromIterator;
use std::ops::{Deref, DerefMut, Index};
use std::panic::UnwindSafe;
#[cfg(feature = "serde")]
use serde::{
de::{Deserialize, Deserializer},
ser::{Serialize, Serializer},
};
use crate::RandomState;
/// A [`HashMap`](std::collections::HashMap) using [`RandomState`](crate::RandomState) to hash the items.
/// (Requires the `std` feature to be enabled.)
#[derive(Clone)]
pub struct AHashMap<K, V, S = crate::RandomState>(HashMap<K, V, S>);
impl<K, V> From<HashMap<K, V, crate::RandomState>> for AHashMap<K, V> {
fn from(item: HashMap<K, V, crate::RandomState>) -> Self {
AHashMap(item)
}
}
impl<K, V, const N: usize> From<[(K, V); N]> for AHashMap<K, V>
where
K: Eq + Hash,
{
/// # Examples
///
/// ```
/// use ahash::AHashMap;
///
/// let map1 = AHashMap::from([(1, 2), (3, 4)]);
/// let map2: AHashMap<_, _> = [(1, 2), (3, 4)].into();
/// assert_eq!(map1, map2);
/// ```
fn from(arr: [(K, V); N]) -> Self {
Self::from_iter(arr)
}
}
impl<K, V> Into<HashMap<K, V, crate::RandomState>> for AHashMap<K, V> {
fn into(self) -> HashMap<K, V, crate::RandomState> {
self.0
}
}
impl<K, V> AHashMap<K, V, RandomState> {
/// This crates a hashmap using [RandomState::new] which obtains its keys from [RandomSource].
/// See the documentation in [RandomSource] for notes about key strength.
pub fn new() -> Self {
AHashMap(HashMap::with_hasher(RandomState::new()))
}
/// This crates a hashmap with the specified capacity using [RandomState::new].
/// See the documentation in [RandomSource] for notes about key strength.
pub fn with_capacity(capacity: usize) -> Self {
AHashMap(HashMap::with_capacity_and_hasher(capacity, RandomState::new()))
}
}
impl<K, V, S> AHashMap<K, V, S>
where
S: BuildHasher,
{
pub fn with_hasher(hash_builder: S) -> Self {
AHashMap(HashMap::with_hasher(hash_builder))
}
pub fn with_capacity_and_hasher(capacity: usize, hash_builder: S) -> Self {
AHashMap(HashMap::with_capacity_and_hasher(capacity, hash_builder))
}
}
impl<K, V, S> AHashMap<K, V, S>
where
K: Hash + Eq,
S: BuildHasher,
{
/// Returns a reference to the value corresponding to the key.
///
/// The key may be any borrowed form of the map's key type, but
/// [`Hash`] and [`Eq`] on the borrowed form *must* match those for
/// the key type.
///
/// # Examples
///
/// ```
/// use std::collections::HashMap;
///
/// let mut map = HashMap::new();
/// map.insert(1, "a");
/// assert_eq!(map.get(&1), Some(&"a"));
/// assert_eq!(map.get(&2), None);
/// ```
#[inline]
pub fn get<Q: ?Sized>(&self, k: &Q) -> Option<&V>
where
K: Borrow<Q>,
Q: Hash + Eq,
{
self.0.get(k)
}
/// Returns the key-value pair corresponding to the supplied key.
///
/// The supplied key may be any borrowed form of the map's key type, but
/// [`Hash`] and [`Eq`] on the borrowed form *must* match those for
/// the key type.
///
/// # Examples
///
/// ```
/// use std::collections::HashMap;
///
/// let mut map = HashMap::new();
/// map.insert(1, "a");
/// assert_eq!(map.get_key_value(&1), Some((&1, &"a")));
/// assert_eq!(map.get_key_value(&2), None);
/// ```
#[inline]
pub fn get_key_value<Q: ?Sized>(&self, k: &Q) -> Option<(&K, &V)>
where
K: Borrow<Q>,
Q: Hash + Eq,
{
self.0.get_key_value(k)
}
/// Returns a mutable reference to the value corresponding to the key.
///
/// The key may be any borrowed form of the map's key type, but
/// [`Hash`] and [`Eq`] on the borrowed form *must* match those for
/// the key type.
///
/// # Examples
///
/// ```
/// use std::collections::HashMap;
///
/// let mut map = HashMap::new();
/// map.insert(1, "a");
/// if let Some(x) = map.get_mut(&1) {
/// *x = "b";
/// }
/// assert_eq!(map[&1], "b");
/// ```
#[inline]
pub fn get_mut<Q: ?Sized>(&mut self, k: &Q) -> Option<&mut V>
where
K: Borrow<Q>,
Q: Hash + Eq,
{
self.0.get_mut(k)
}
/// Inserts a key-value pair into the map.
///
/// If the map did not have this key present, [`None`] is returned.
///
/// If the map did have this key present, the value is updated, and the old
/// value is returned. The key is not updated, though; this matters for
/// types that can be `==` without being identical. See the [module-level
/// documentation] for more.
///
/// # Examples
///
/// ```
/// use std::collections::HashMap;
///
/// let mut map = HashMap::new();
/// assert_eq!(map.insert(37, "a"), None);
/// assert_eq!(map.is_empty(), false);
///
/// map.insert(37, "b");
/// assert_eq!(map.insert(37, "c"), Some("b"));
/// assert_eq!(map[&37], "c");
/// ```
#[inline]
pub fn insert(&mut self, k: K, v: V) -> Option<V> {
self.0.insert(k, v)
}
/// Creates a consuming iterator visiting all the keys in arbitrary order.
/// The map cannot be used after calling this.
/// The iterator element type is `K`.
///
/// # Examples
///
/// ```
/// use std::collections::HashMap;
///
/// let map = HashMap::from([
/// ("a", 1),
/// ("b", 2),
/// ("c", 3),
/// ]);
///
/// let mut vec: Vec<&str> = map.into_keys().collect();
/// // The `IntoKeys` iterator produces keys in arbitrary order, so the
/// // keys must be sorted to test them against a sorted array.
/// vec.sort_unstable();
/// assert_eq!(vec, ["a", "b", "c"]);
/// ```
///
/// # Performance
///
/// In the current implementation, iterating over keys takes O(capacity) time
/// instead of O(len) because it internally visits empty buckets too.
#[inline]
pub fn into_keys(self) -> IntoKeys<K, V> {
self.0.into_keys()
}
/// Creates a consuming iterator visiting all the values in arbitrary order.
/// The map cannot be used after calling this.
/// The iterator element type is `V`.
///
/// # Examples
///
/// ```
/// use std::collections::HashMap;
///
/// let map = HashMap::from([
/// ("a", 1),
/// ("b", 2),
/// ("c", 3),
/// ]);
///
/// let mut vec: Vec<i32> = map.into_values().collect();
/// // The `IntoValues` iterator produces values in arbitrary order, so
/// // the values must be sorted to test them against a sorted array.
/// vec.sort_unstable();
/// assert_eq!(vec, [1, 2, 3]);
/// ```
///
/// # Performance
///
/// In the current implementation, iterating over values takes O(capacity) time
/// instead of O(len) because it internally visits empty buckets too.
#[inline]
pub fn into_values(self) -> IntoValues<K, V> {
self.0.into_values()
}
/// Removes a key from the map, returning the value at the key if the key
/// was previously in the map.
///
/// The key may be any borrowed form of the map's key type, but
/// [`Hash`] and [`Eq`] on the borrowed form *must* match those for
/// the key type.
///
/// # Examples
///
/// ```
/// use std::collections::HashMap;
///
/// let mut map = HashMap::new();
/// map.insert(1, "a");
/// assert_eq!(map.remove(&1), Some("a"));
/// assert_eq!(map.remove(&1), None);
/// ```
#[inline]
pub fn remove<Q: ?Sized>(&mut self, k: &Q) -> Option<V>
where
K: Borrow<Q>,
Q: Hash + Eq,
{
self.0.remove(k)
}
}
impl<K, V, S> Deref for AHashMap<K, V, S> {
type Target = HashMap<K, V, S>;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl<K, V, S> DerefMut for AHashMap<K, V, S> {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.0
}
}
impl<K, V, S> UnwindSafe for AHashMap<K, V, S>
where
K: UnwindSafe,
V: UnwindSafe,
{
}
impl<K, V, S> PartialEq for AHashMap<K, V, S>
where
K: Eq + Hash,
V: PartialEq,
S: BuildHasher,
{
fn eq(&self, other: &AHashMap<K, V, S>) -> bool {
self.0.eq(&other.0)
}
}
impl<K, V, S> Eq for AHashMap<K, V, S>
where
K: Eq + Hash,
V: Eq,
S: BuildHasher,
{
}
impl<K, Q: ?Sized, V, S> Index<&Q> for AHashMap<K, V, S>
where
K: Eq + Hash + Borrow<Q>,
Q: Eq + Hash,
S: BuildHasher,
{
type Output = V;
/// Returns a reference to the value corresponding to the supplied key.
///
/// # Panics
///
/// Panics if the key is not present in the `HashMap`.
#[inline]
fn index(&self, key: &Q) -> &V {
self.0.index(key)
}
}
impl<K, V, S> Debug for AHashMap<K, V, S>
where
K: Debug,
V: Debug,
S: BuildHasher,
{
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
self.0.fmt(fmt)
}
}
impl<K, V> FromIterator<(K, V)> for AHashMap<K, V, RandomState>
where
K: Eq + Hash,
{
/// This crates a hashmap from the provided iterator using [RandomState::new].
/// See the documentation in [RandomSource] for notes about key strength.
fn from_iter<T: IntoIterator<Item = (K, V)>>(iter: T) -> Self {
let mut inner = HashMap::with_hasher(RandomState::new());
inner.extend(iter);
AHashMap(inner)
}
}
impl<'a, K, V, S> IntoIterator for &'a AHashMap<K, V, S> {
type Item = (&'a K, &'a V);
type IntoIter = hash_map::Iter<'a, K, V>;
fn into_iter(self) -> Self::IntoIter {
(&self.0).iter()
}
}
impl<'a, K, V, S> IntoIterator for &'a mut AHashMap<K, V, S> {
type Item = (&'a K, &'a mut V);
type IntoIter = hash_map::IterMut<'a, K, V>;
fn into_iter(self) -> Self::IntoIter {
(&mut self.0).iter_mut()
}
}
impl<K, V, S> IntoIterator for AHashMap<K, V, S> {
type Item = (K, V);
type IntoIter = hash_map::IntoIter<K, V>;
fn into_iter(self) -> Self::IntoIter {
self.0.into_iter()
}
}
impl<K, V, S> Extend<(K, V)> for AHashMap<K, V, S>
where
K: Eq + Hash,
S: BuildHasher,
{
#[inline]
fn extend<T: IntoIterator<Item = (K, V)>>(&mut self, iter: T) {
self.0.extend(iter)
}
}
impl<'a, K, V, S> Extend<(&'a K, &'a V)> for AHashMap<K, V, S>
where
K: Eq + Hash + Copy + 'a,
V: Copy + 'a,
S: BuildHasher,
{
#[inline]
fn extend<T: IntoIterator<Item = (&'a K, &'a V)>>(&mut self, iter: T) {
self.0.extend(iter)
}
}
/// NOTE: For safety this trait impl is only available available if either of the flags `runtime-rng` (on by default) or
/// `compile-time-rng` are enabled. This is to prevent weakly keyed maps from being accidentally created. Instead one of
/// constructors for [RandomState] must be used.
#[cfg(any(feature = "compile-time-rng", feature = "runtime-rng", feature = "no-rng"))]
impl<K, V> Default for AHashMap<K, V, RandomState> {
#[inline]
fn default() -> AHashMap<K, V, RandomState> {
AHashMap(HashMap::default())
}
}
#[cfg(feature = "serde")]
impl<K, V> Serialize for AHashMap<K, V>
where
K: Serialize + Eq + Hash,
V: Serialize,
{
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
self.deref().serialize(serializer)
}
}
#[cfg(feature = "serde")]
impl<'de, K, V> Deserialize<'de> for AHashMap<K, V>
where
K: Deserialize<'de> + Eq + Hash,
V: Deserialize<'de>,
{
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
let hash_map = HashMap::deserialize(deserializer);
hash_map.map(|hash_map| Self(hash_map))
}
fn deserialize_in_place<D: Deserializer<'de>>(deserializer: D, place: &mut Self) -> Result<(), D::Error> {
use serde::de::{MapAccess, Visitor};
struct MapInPlaceVisitor<'a, K: 'a, V: 'a>(&'a mut AHashMap<K, V>);
impl<'a, 'de, K, V> Visitor<'de> for MapInPlaceVisitor<'a, K, V>
where
K: Deserialize<'de> + Eq + Hash,
V: Deserialize<'de>,
{
type Value = ();
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a map")
}
fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error>
where
A: MapAccess<'de>,
{
self.0.clear();
self.0.reserve(map.size_hint().unwrap_or(0).min(4096));
while let Some((key, value)) = map.next_entry()? {
self.0.insert(key, value);
}
Ok(())
}
}
deserializer.deserialize_map(MapInPlaceVisitor(place))
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test_borrow() {
let mut map: AHashMap<String, String> = AHashMap::new();
map.insert("foo".to_string(), "Bar".to_string());
map.insert("Bar".to_string(), map.get("foo").unwrap().to_owned());
}
#[cfg(feature = "serde")]
#[test]
fn test_serde() {
let mut map = AHashMap::new();
map.insert("for".to_string(), 0);
map.insert("bar".to_string(), 1);
let mut serialization = serde_json::to_string(&map).unwrap();
let mut deserialization: AHashMap<String, u64> = serde_json::from_str(&serialization).unwrap();
assert_eq!(deserialization, map);
map.insert("baz".to_string(), 2);
serialization = serde_json::to_string(&map).unwrap();
let mut deserializer = serde_json::Deserializer::from_str(&serialization);
AHashMap::deserialize_in_place(&mut deserializer, &mut deserialization).unwrap();
assert_eq!(deserialization, map);
}
}

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use core::hash::{Hash, Hasher};
use std::collections::HashMap;
fn assert_sufficiently_different(a: u64, b: u64, tolerance: i32) {
let (same_byte_count, same_nibble_count) = count_same_bytes_and_nibbles(a, b);
assert!(same_byte_count <= tolerance, "{:x} vs {:x}: {:}", a, b, same_byte_count);
assert!(
same_nibble_count <= tolerance * 3,
"{:x} vs {:x}: {:}",
a,
b,
same_nibble_count
);
let flipped_bits = (a ^ b).count_ones();
assert!(
flipped_bits > 12 && flipped_bits < 52,
"{:x} and {:x}: {:}",
a,
b,
flipped_bits
);
for rotate in 0..64 {
let flipped_bits2 = (a ^ (b.rotate_left(rotate))).count_ones();
assert!(
flipped_bits2 > 10 && flipped_bits2 < 54,
"{:x} and {:x}: {:}",
a,
b.rotate_left(rotate),
flipped_bits2
);
}
}
fn count_same_bytes_and_nibbles(a: u64, b: u64) -> (i32, i32) {
let mut same_byte_count = 0;
let mut same_nibble_count = 0;
for byte in 0..8 {
let ba = (a >> (8 * byte)) as u8;
let bb = (b >> (8 * byte)) as u8;
if ba == bb {
same_byte_count += 1;
}
if ba & 0xF0u8 == bb & 0xF0u8 {
same_nibble_count += 1;
}
if ba & 0x0Fu8 == bb & 0x0Fu8 {
same_nibble_count += 1;
}
}
(same_byte_count, same_nibble_count)
}
fn gen_combinations(options: &[u32; 11], depth: u32, so_far: Vec<u32>, combinations: &mut Vec<Vec<u32>>) {
if depth == 0 {
return;
}
for option in options {
let mut next = so_far.clone();
next.push(*option);
combinations.push(next.clone());
gen_combinations(options, depth - 1, next, combinations);
}
}
fn test_no_full_collisions<T: Hasher>(gen_hash: impl Fn() -> T) {
let options: [u32; 11] = [
0x00000000, 0x10000000, 0x20000000, 0x40000000, 0x80000000, 0xF0000000, 1, 2, 4, 8, 15,
];
let mut combinations = Vec::new();
gen_combinations(&options, 7, Vec::new(), &mut combinations);
let mut map: HashMap<u64, Vec<u8>> = HashMap::new();
for combination in combinations {
use zerocopy::AsBytes;
let array = combination.as_slice().as_bytes().to_vec();
let mut hasher = gen_hash();
hasher.write(&array);
let hash = hasher.finish();
if let Some(value) = map.get(&hash) {
assert_eq!(
value, &array,
"Found a collision between {:x?} and {:x?}. Hash: {:x?}",
value, &array, &hash
);
} else {
map.insert(hash, array);
}
}
assert_eq!(21435887, map.len()); //11^7 + 11^6 ...
}
fn test_keys_change_output<T: Hasher>(constructor: impl Fn(u128, u128) -> T) {
let mut a = constructor(1, 1);
let mut b = constructor(1, 2);
let mut c = constructor(2, 1);
let mut d = constructor(2, 2);
"test".hash(&mut a);
"test".hash(&mut b);
"test".hash(&mut c);
"test".hash(&mut d);
assert_sufficiently_different(a.finish(), b.finish(), 1);
assert_sufficiently_different(a.finish(), c.finish(), 1);
assert_sufficiently_different(a.finish(), d.finish(), 1);
assert_sufficiently_different(b.finish(), c.finish(), 1);
assert_sufficiently_different(b.finish(), d.finish(), 1);
assert_sufficiently_different(c.finish(), d.finish(), 1);
}
fn test_input_affect_every_byte<T: Hasher>(constructor: impl Fn(u128, u128) -> T) {
let base = hash_with(&0, constructor(0, 0));
for shift in 0..16 {
let mut alternatives = vec![];
for v in 0..256 {
let input = (v as u128) << (shift * 8);
let hasher = constructor(0, 0);
alternatives.push(hash_with(&input, hasher));
}
assert_each_byte_differs(shift, base, alternatives);
}
}
///Ensures that for every bit in the output there is some value for each byte in the key that flips it.
fn test_keys_affect_every_byte<H: Hash, T: Hasher>(item: H, constructor: impl Fn(u128, u128) -> T) {
let base = hash_with(&item, constructor(0, 0));
for shift in 0..16 {
let mut alternatives1 = vec![];
let mut alternatives2 = vec![];
for v in 0..256 {
let input = (v as u128) << (shift * 8);
let hasher1 = constructor(input, 0);
let hasher2 = constructor(0, input);
let h1 = hash_with(&item, hasher1);
let h2 = hash_with(&item, hasher2);
alternatives1.push(h1);
alternatives2.push(h2);
}
assert_each_byte_differs(shift, base, alternatives1);
assert_each_byte_differs(shift, base, alternatives2);
}
}
fn assert_each_byte_differs(num: u64, base: u64, alternatives: Vec<u64>) {
let mut changed_bits = 0_u64;
for alternative in alternatives {
changed_bits |= base ^ alternative
}
assert_eq!(
core::u64::MAX,
changed_bits,
"Bits changed: {:x} on num: {:?}. base {:x}",
changed_bits,
num,
base
);
}
fn test_finish_is_consistent<T: Hasher>(constructor: impl Fn(u128, u128) -> T) {
let mut hasher = constructor(1, 2);
"Foo".hash(&mut hasher);
let a = hasher.finish();
let b = hasher.finish();
assert_eq!(a, b);
}
fn test_single_key_bit_flip<T: Hasher>(constructor: impl Fn(u128, u128) -> T) {
for bit in 0..128 {
let mut a = constructor(0, 0);
let mut b = constructor(0, 1 << bit);
let mut c = constructor(1 << bit, 0);
"1234".hash(&mut a);
"1234".hash(&mut b);
"1234".hash(&mut c);
assert_sufficiently_different(a.finish(), b.finish(), 2);
assert_sufficiently_different(a.finish(), c.finish(), 2);
assert_sufficiently_different(b.finish(), c.finish(), 2);
let mut a = constructor(0, 0);
let mut b = constructor(0, 1 << bit);
let mut c = constructor(1 << bit, 0);
"12345678".hash(&mut a);
"12345678".hash(&mut b);
"12345678".hash(&mut c);
assert_sufficiently_different(a.finish(), b.finish(), 2);
assert_sufficiently_different(a.finish(), c.finish(), 2);
assert_sufficiently_different(b.finish(), c.finish(), 2);
let mut a = constructor(0, 0);
let mut b = constructor(0, 1 << bit);
let mut c = constructor(1 << bit, 0);
"1234567812345678".hash(&mut a);
"1234567812345678".hash(&mut b);
"1234567812345678".hash(&mut c);
assert_sufficiently_different(a.finish(), b.finish(), 2);
assert_sufficiently_different(a.finish(), c.finish(), 2);
assert_sufficiently_different(b.finish(), c.finish(), 2);
}
}
fn test_all_bytes_matter<T: Hasher>(hasher: impl Fn() -> T) {
let mut item = vec![0; 256];
let base_hash = hash(&item, &hasher);
for pos in 0..256 {
item[pos] = 255;
let hash = hash(&item, &hasher);
assert_ne!(base_hash, hash, "Position {} did not affect output", pos);
item[pos] = 0;
}
}
fn test_no_pair_collisions<T: Hasher>(hasher: impl Fn() -> T) {
let base = [0_u64, 0_u64];
let base_hash = hash(&base, &hasher);
for bitpos1 in 0..64 {
let a = 1_u64 << bitpos1;
for bitpos2 in 0..bitpos1 {
let b = 1_u64 << bitpos2;
let aa = hash(&[a, a], &hasher);
let ab = hash(&[a, b], &hasher);
let ba = hash(&[b, a], &hasher);
let bb = hash(&[b, b], &hasher);
assert_sufficiently_different(base_hash, aa, 3);
assert_sufficiently_different(base_hash, ab, 3);
assert_sufficiently_different(base_hash, ba, 3);
assert_sufficiently_different(base_hash, bb, 3);
assert_sufficiently_different(aa, ab, 3);
assert_sufficiently_different(ab, ba, 3);
assert_sufficiently_different(ba, bb, 3);
assert_sufficiently_different(aa, ba, 3);
assert_sufficiently_different(ab, bb, 3);
assert_sufficiently_different(aa, bb, 3);
}
}
}
fn hash<H: Hash, T: Hasher>(b: &H, hash_builder: &dyn Fn() -> T) -> u64 {
let mut hasher = hash_builder();
b.hash(&mut hasher);
hasher.finish()
}
fn hash_with<H: Hash, T: Hasher>(b: &H, mut hasher: T) -> u64 {
b.hash(&mut hasher);
hasher.finish()
}
fn test_single_bit_flip<T: Hasher>(hasher: impl Fn() -> T) {
let size = 32;
let compare_value = hash(&0u32, &hasher);
for pos in 0..size {
let test_value = hash(&(1u32 << pos), &hasher);
assert_sufficiently_different(compare_value, test_value, 2);
}
let size = 64;
let compare_value = hash(&0u64, &hasher);
for pos in 0..size {
let test_value = hash(&(1u64 << pos), &hasher);
assert_sufficiently_different(compare_value, test_value, 2);
}
let size = 128;
let compare_value = hash(&0u128, &hasher);
for pos in 0..size {
let test_value = hash(&(1u128 << pos), &hasher);
dbg!(compare_value, test_value);
assert_sufficiently_different(compare_value, test_value, 2);
}
}
fn test_padding_doesnot_collide<T: Hasher>(hasher: impl Fn() -> T) {
for c in 0..128u8 {
for string in ["", "\0", "\x01", "1234", "12345678", "1234567812345678"].iter() {
let mut short = hasher();
string.hash(&mut short);
let value = short.finish();
let mut padded = string.to_string();
for num in 1..=128 {
let mut long = hasher();
padded.push(c as char);
padded.hash(&mut long);
let (same_bytes, same_nibbles) = count_same_bytes_and_nibbles(value, long.finish());
assert!(
same_bytes <= 3,
"{} bytes of {} -> {:x} vs {:x}",
num,
c,
value,
long.finish()
);
assert!(
same_nibbles <= 8,
"{} bytes of {} -> {:x} vs {:x}",
num,
c,
value,
long.finish()
);
let flipped_bits = (value ^ long.finish()).count_ones();
assert!(flipped_bits > 10);
}
if string.len() > 0 {
let mut padded = string[1..].to_string();
padded.push(c as char);
for num in 2..=128 {
let mut long = hasher();
padded.push(c as char);
padded.hash(&mut long);
let (same_bytes, same_nibbles) = count_same_bytes_and_nibbles(value, long.finish());
assert!(
same_bytes <= 3,
"string {:?} + {} bytes of {} -> {:x} vs {:x}",
string,
num,
c,
value,
long.finish()
);
assert!(
same_nibbles <= 8,
"string {:?} + {} bytes of {} -> {:x} vs {:x}",
string,
num,
c,
value,
long.finish()
);
let flipped_bits = (value ^ long.finish()).count_ones();
assert!(flipped_bits > 10);
}
}
}
}
}
fn test_length_extension<T: Hasher>(hasher: impl Fn(u128, u128) -> T) {
for key in 0..256 {
let h1 = hasher(key, key);
let v1 = hash_with(&[0_u8, 0, 0, 0, 0, 0, 0, 0], h1);
let h2 = hasher(key, key);
let v2 = hash_with(&[1_u8, 0, 0, 0, 0, 0, 0, 0, 0], h2);
assert_ne!(v1, v2);
}
}
fn test_sparse<T: Hasher>(hasher: impl Fn() -> T) {
use smallvec::SmallVec;
let mut buf = [0u8; 256];
let mut hashes = HashMap::new();
for idx_1 in 0..255_u8 {
for idx_2 in idx_1 + 1..=255_u8 {
for value_1 in [1, 2, 4, 8, 16, 32, 64, 128] {
for value_2 in [
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 16, 17, 18, 20, 24, 31, 32, 33, 48, 64, 96, 127, 128, 129,
192, 254, 255,
] {
buf[idx_1 as usize] = value_1;
buf[idx_2 as usize] = value_2;
let hash_value = hash_with(&buf, &mut hasher());
let keys = hashes.entry(hash_value).or_insert(SmallVec::<[[u8; 4]; 1]>::new());
keys.push([idx_1, value_1, idx_2, value_2]);
buf[idx_1 as usize] = 0;
buf[idx_2 as usize] = 0;
}
}
}
}
hashes.retain(|_key, value| value.len() != 1);
assert_eq!(0, hashes.len(), "Collision with: {:?}", hashes);
}
#[cfg(test)]
mod fallback_tests {
use crate::fallback_hash::*;
use crate::hash_quality_test::*;
#[test]
fn fallback_single_bit_flip() {
test_single_bit_flip(|| AHasher::new_with_keys(0, 0))
}
#[test]
fn fallback_single_key_bit_flip() {
test_single_key_bit_flip(AHasher::new_with_keys)
}
#[test]
fn fallback_all_bytes_matter() {
test_all_bytes_matter(|| AHasher::new_with_keys(0, 0));
}
#[test]
fn fallback_test_no_pair_collisions() {
test_no_pair_collisions(|| AHasher::new_with_keys(0, 0));
}
#[test]
fn fallback_test_no_full_collisions() {
test_no_full_collisions(|| AHasher::new_with_keys(0, 0));
}
#[test]
fn fallback_keys_change_output() {
test_keys_change_output(AHasher::new_with_keys);
}
#[test]
fn fallback_input_affect_every_byte() {
test_input_affect_every_byte(AHasher::new_with_keys);
}
#[test]
fn fallback_keys_affect_every_byte() {
//For fallback second key is not used in every hash.
#[cfg(all(not(feature = "specialize"), feature = "folded_multiply"))]
test_keys_affect_every_byte(0, |a, b| AHasher::new_with_keys(a ^ b, a));
test_keys_affect_every_byte("", |a, b| AHasher::new_with_keys(a ^ b, a));
test_keys_affect_every_byte((0, 0), |a, b| AHasher::new_with_keys(a ^ b, a));
}
#[test]
fn fallback_finish_is_consistant() {
test_finish_is_consistent(AHasher::test_with_keys)
}
#[test]
fn fallback_padding_doesnot_collide() {
test_padding_doesnot_collide(|| AHasher::new_with_keys(0, 0));
test_padding_doesnot_collide(|| AHasher::new_with_keys(0, 2));
test_padding_doesnot_collide(|| AHasher::new_with_keys(2, 0));
test_padding_doesnot_collide(|| AHasher::new_with_keys(2, 2));
}
#[test]
fn fallback_length_extension() {
test_length_extension(|a, b| AHasher::new_with_keys(a, b));
}
#[test]
fn test_no_sparse_collisions() {
test_sparse(|| AHasher::new_with_keys(0, 0));
test_sparse(|| AHasher::new_with_keys(1, 2));
}
}
///Basic sanity tests of the cypto properties of aHash.
#[cfg(any(
all(any(target_arch = "x86", target_arch = "x86_64"), target_feature = "aes", not(miri)),
all(target_arch = "aarch64", target_feature = "aes", not(miri)),
all(feature = "nightly-arm-aes", target_arch = "arm", target_feature = "aes", not(miri)),
))]
#[cfg(test)]
mod aes_tests {
use crate::aes_hash::*;
use crate::hash_quality_test::*;
use std::hash::{Hash, Hasher};
//This encrypts to 0.
const BAD_KEY2: u128 = 0x6363_6363_6363_6363_6363_6363_6363_6363;
//This decrypts to 0.
const BAD_KEY: u128 = 0x5252_5252_5252_5252_5252_5252_5252_5252;
#[test]
fn test_single_bit_in_byte() {
let mut hasher1 = AHasher::test_with_keys(0, 0);
8_u32.hash(&mut hasher1);
let mut hasher2 = AHasher::test_with_keys(0, 0);
0_u32.hash(&mut hasher2);
assert_sufficiently_different(hasher1.finish(), hasher2.finish(), 1);
}
#[test]
fn aes_single_bit_flip() {
test_single_bit_flip(|| AHasher::test_with_keys(BAD_KEY, BAD_KEY));
test_single_bit_flip(|| AHasher::test_with_keys(BAD_KEY2, BAD_KEY2));
}
#[test]
fn aes_single_key_bit_flip() {
test_single_key_bit_flip(AHasher::test_with_keys)
}
#[test]
fn aes_all_bytes_matter() {
test_all_bytes_matter(|| AHasher::test_with_keys(BAD_KEY, BAD_KEY));
test_all_bytes_matter(|| AHasher::test_with_keys(BAD_KEY2, BAD_KEY2));
}
#[test]
fn aes_test_no_pair_collisions() {
test_no_pair_collisions(|| AHasher::test_with_keys(BAD_KEY, BAD_KEY));
test_no_pair_collisions(|| AHasher::test_with_keys(BAD_KEY2, BAD_KEY2));
}
#[test]
fn ase_test_no_full_collisions() {
test_no_full_collisions(|| AHasher::test_with_keys(12345, 67890));
}
#[test]
fn aes_keys_change_output() {
test_keys_change_output(AHasher::test_with_keys);
}
#[test]
fn aes_input_affect_every_byte() {
test_input_affect_every_byte(AHasher::test_with_keys);
}
#[test]
fn aes_keys_affect_every_byte() {
#[cfg(not(feature = "specialize"))]
test_keys_affect_every_byte(0, AHasher::test_with_keys);
test_keys_affect_every_byte("", AHasher::test_with_keys);
test_keys_affect_every_byte((0, 0), AHasher::test_with_keys);
}
#[test]
fn aes_finish_is_consistant() {
test_finish_is_consistent(AHasher::test_with_keys)
}
#[test]
fn aes_padding_doesnot_collide() {
test_padding_doesnot_collide(|| AHasher::test_with_keys(BAD_KEY, BAD_KEY));
test_padding_doesnot_collide(|| AHasher::test_with_keys(BAD_KEY2, BAD_KEY2));
}
#[test]
fn aes_length_extension() {
test_length_extension(|a, b| AHasher::test_with_keys(a, b));
}
#[test]
fn aes_no_sparse_collisions() {
test_sparse(|| AHasher::test_with_keys(0, 0));
test_sparse(|| AHasher::test_with_keys(1, 2));
}
}

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use crate::RandomState;
use std::collections::{hash_set, HashSet};
use std::fmt::{self, Debug};
use std::hash::{BuildHasher, Hash};
use std::iter::FromIterator;
use std::ops::{BitAnd, BitOr, BitXor, Deref, DerefMut, Sub};
#[cfg(feature = "serde")]
use serde::{
de::{Deserialize, Deserializer},
ser::{Serialize, Serializer},
};
/// A [`HashSet`](std::collections::HashSet) using [`RandomState`](crate::RandomState) to hash the items.
/// (Requires the `std` feature to be enabled.)
#[derive(Clone)]
pub struct AHashSet<T, S = RandomState>(HashSet<T, S>);
impl<T> From<HashSet<T, RandomState>> for AHashSet<T> {
fn from(item: HashSet<T, RandomState>) -> Self {
AHashSet(item)
}
}
impl<T, const N: usize> From<[T; N]> for AHashSet<T>
where
T: Eq + Hash,
{
/// # Examples
///
/// ```
/// use ahash::AHashSet;
///
/// let set1 = AHashSet::from([1, 2, 3, 4]);
/// let set2: AHashSet<_> = [1, 2, 3, 4].into();
/// assert_eq!(set1, set2);
/// ```
fn from(arr: [T; N]) -> Self {
Self::from_iter(arr)
}
}
impl<T> Into<HashSet<T, RandomState>> for AHashSet<T> {
fn into(self) -> HashSet<T, RandomState> {
self.0
}
}
impl<T> AHashSet<T, RandomState> {
/// This crates a hashset using [RandomState::new].
/// See the documentation in [RandomSource] for notes about key strength.
pub fn new() -> Self {
AHashSet(HashSet::with_hasher(RandomState::new()))
}
/// This crates a hashset with the specified capacity using [RandomState::new].
/// See the documentation in [RandomSource] for notes about key strength.
pub fn with_capacity(capacity: usize) -> Self {
AHashSet(HashSet::with_capacity_and_hasher(capacity, RandomState::new()))
}
}
impl<T, S> AHashSet<T, S>
where
S: BuildHasher,
{
pub fn with_hasher(hash_builder: S) -> Self {
AHashSet(HashSet::with_hasher(hash_builder))
}
pub fn with_capacity_and_hasher(capacity: usize, hash_builder: S) -> Self {
AHashSet(HashSet::with_capacity_and_hasher(capacity, hash_builder))
}
}
impl<T, S> Deref for AHashSet<T, S> {
type Target = HashSet<T, S>;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl<T, S> DerefMut for AHashSet<T, S> {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.0
}
}
impl<T, S> PartialEq for AHashSet<T, S>
where
T: Eq + Hash,
S: BuildHasher,
{
fn eq(&self, other: &AHashSet<T, S>) -> bool {
self.0.eq(&other.0)
}
}
impl<T, S> Eq for AHashSet<T, S>
where
T: Eq + Hash,
S: BuildHasher,
{
}
impl<T, S> BitOr<&AHashSet<T, S>> for &AHashSet<T, S>
where
T: Eq + Hash + Clone,
S: BuildHasher + Default,
{
type Output = AHashSet<T, S>;
/// Returns the union of `self` and `rhs` as a new `AHashSet<T, S>`.
///
/// # Examples
///
/// ```
/// use ahash::AHashSet;
///
/// let a: AHashSet<_> = vec![1, 2, 3].into_iter().collect();
/// let b: AHashSet<_> = vec![3, 4, 5].into_iter().collect();
///
/// let set = &a | &b;
///
/// let mut i = 0;
/// let expected = [1, 2, 3, 4, 5];
/// for x in &set {
/// assert!(expected.contains(x));
/// i += 1;
/// }
/// assert_eq!(i, expected.len());
/// ```
fn bitor(self, rhs: &AHashSet<T, S>) -> AHashSet<T, S> {
AHashSet(self.0.bitor(&rhs.0))
}
}
impl<T, S> BitAnd<&AHashSet<T, S>> for &AHashSet<T, S>
where
T: Eq + Hash + Clone,
S: BuildHasher + Default,
{
type Output = AHashSet<T, S>;
/// Returns the intersection of `self` and `rhs` as a new `AHashSet<T, S>`.
///
/// # Examples
///
/// ```
/// use ahash::AHashSet;
///
/// let a: AHashSet<_> = vec![1, 2, 3].into_iter().collect();
/// let b: AHashSet<_> = vec![2, 3, 4].into_iter().collect();
///
/// let set = &a & &b;
///
/// let mut i = 0;
/// let expected = [2, 3];
/// for x in &set {
/// assert!(expected.contains(x));
/// i += 1;
/// }
/// assert_eq!(i, expected.len());
/// ```
fn bitand(self, rhs: &AHashSet<T, S>) -> AHashSet<T, S> {
AHashSet(self.0.bitand(&rhs.0))
}
}
impl<T, S> BitXor<&AHashSet<T, S>> for &AHashSet<T, S>
where
T: Eq + Hash + Clone,
S: BuildHasher + Default,
{
type Output = AHashSet<T, S>;
/// Returns the symmetric difference of `self` and `rhs` as a new `AHashSet<T, S>`.
///
/// # Examples
///
/// ```
/// use ahash::AHashSet;
///
/// let a: AHashSet<_> = vec![1, 2, 3].into_iter().collect();
/// let b: AHashSet<_> = vec![3, 4, 5].into_iter().collect();
///
/// let set = &a ^ &b;
///
/// let mut i = 0;
/// let expected = [1, 2, 4, 5];
/// for x in &set {
/// assert!(expected.contains(x));
/// i += 1;
/// }
/// assert_eq!(i, expected.len());
/// ```
fn bitxor(self, rhs: &AHashSet<T, S>) -> AHashSet<T, S> {
AHashSet(self.0.bitxor(&rhs.0))
}
}
impl<T, S> Sub<&AHashSet<T, S>> for &AHashSet<T, S>
where
T: Eq + Hash + Clone,
S: BuildHasher + Default,
{
type Output = AHashSet<T, S>;
/// Returns the difference of `self` and `rhs` as a new `AHashSet<T, S>`.
///
/// # Examples
///
/// ```
/// use ahash::AHashSet;
///
/// let a: AHashSet<_> = vec![1, 2, 3].into_iter().collect();
/// let b: AHashSet<_> = vec![3, 4, 5].into_iter().collect();
///
/// let set = &a - &b;
///
/// let mut i = 0;
/// let expected = [1, 2];
/// for x in &set {
/// assert!(expected.contains(x));
/// i += 1;
/// }
/// assert_eq!(i, expected.len());
/// ```
fn sub(self, rhs: &AHashSet<T, S>) -> AHashSet<T, S> {
AHashSet(self.0.sub(&rhs.0))
}
}
impl<T, S> Debug for AHashSet<T, S>
where
T: Debug,
S: BuildHasher,
{
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
self.0.fmt(fmt)
}
}
impl<T> FromIterator<T> for AHashSet<T, RandomState>
where
T: Eq + Hash,
{
/// This crates a hashset from the provided iterator using [RandomState::new].
/// See the documentation in [RandomSource] for notes about key strength.
#[inline]
fn from_iter<I: IntoIterator<Item = T>>(iter: I) -> AHashSet<T> {
let mut inner = HashSet::with_hasher(RandomState::new());
inner.extend(iter);
AHashSet(inner)
}
}
impl<'a, T, S> IntoIterator for &'a AHashSet<T, S> {
type Item = &'a T;
type IntoIter = hash_set::Iter<'a, T>;
fn into_iter(self) -> Self::IntoIter {
(&self.0).iter()
}
}
impl<T, S> IntoIterator for AHashSet<T, S> {
type Item = T;
type IntoIter = hash_set::IntoIter<T>;
fn into_iter(self) -> Self::IntoIter {
self.0.into_iter()
}
}
impl<T, S> Extend<T> for AHashSet<T, S>
where
T: Eq + Hash,
S: BuildHasher,
{
#[inline]
fn extend<I: IntoIterator<Item = T>>(&mut self, iter: I) {
self.0.extend(iter)
}
}
impl<'a, T, S> Extend<&'a T> for AHashSet<T, S>
where
T: 'a + Eq + Hash + Copy,
S: BuildHasher,
{
#[inline]
fn extend<I: IntoIterator<Item = &'a T>>(&mut self, iter: I) {
self.0.extend(iter)
}
}
/// NOTE: For safety this trait impl is only available available if either of the flags `runtime-rng` (on by default) or
/// `compile-time-rng` are enabled. This is to prevent weakly keyed maps from being accidentally created. Instead one of
/// constructors for [RandomState] must be used.
#[cfg(any(feature = "compile-time-rng", feature = "runtime-rng", feature = "no-rng"))]
impl<T> Default for AHashSet<T, RandomState> {
/// Creates an empty `AHashSet<T, S>` with the `Default` value for the hasher.
#[inline]
fn default() -> AHashSet<T, RandomState> {
AHashSet(HashSet::default())
}
}
#[cfg(feature = "serde")]
impl<T> Serialize for AHashSet<T>
where
T: Serialize + Eq + Hash,
{
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
self.deref().serialize(serializer)
}
}
#[cfg(feature = "serde")]
impl<'de, T> Deserialize<'de> for AHashSet<T>
where
T: Deserialize<'de> + Eq + Hash,
{
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
let hash_set = HashSet::deserialize(deserializer);
hash_set.map(|hash_set| Self(hash_set))
}
fn deserialize_in_place<D: Deserializer<'de>>(deserializer: D, place: &mut Self) -> Result<(), D::Error> {
HashSet::deserialize_in_place(deserializer, place)
}
}
#[cfg(all(test, feature = "serde"))]
mod test {
use super::*;
#[test]
fn test_serde() {
let mut set = AHashSet::new();
set.insert("for".to_string());
set.insert("bar".to_string());
let mut serialization = serde_json::to_string(&set).unwrap();
let mut deserialization: AHashSet<String> = serde_json::from_str(&serialization).unwrap();
assert_eq!(deserialization, set);
set.insert("baz".to_string());
serialization = serde_json::to_string(&set).unwrap();
let mut deserializer = serde_json::Deserializer::from_str(&serialization);
AHashSet::deserialize_in_place(&mut deserializer, &mut deserialization).unwrap();
assert_eq!(deserialization, set);
}
}

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//! AHash is a high performance keyed hash function.
//!
//! It quickly provides a high quality hash where the result is not predictable without knowing the Key.
//! AHash works with `HashMap` to hash keys, but without allowing for the possibility that an malicious user can
//! induce a collision.
//!
//! # How aHash works
//!
//! When it is available aHash uses the hardware AES instructions to provide a keyed hash function.
//! When it is not, aHash falls back on a slightly slower alternative algorithm.
//!
//! Because aHash does not have a fixed standard for its output, it is able to improve over time.
//! But this also means that different computers or computers using different versions of ahash may observe different
//! hash values for the same input.
#![cfg_attr(
all(
feature = "std",
any(feature = "compile-time-rng", feature = "runtime-rng", feature = "no-rng")
),
doc = r##"
# Basic Usage
AHash provides an implementation of the [Hasher] trait.
To construct a HashMap using aHash as its hasher do the following:
```
use ahash::{AHasher, RandomState};
use std::collections::HashMap;
let mut map: HashMap<i32, i32, RandomState> = HashMap::default();
map.insert(12, 34);
```
### Randomness
The above requires a source of randomness to generate keys for the hashmap. By default this obtained from the OS.
It is also possible to have randomness supplied via the `compile-time-rng` flag, or manually.
### If randomess is not available
[AHasher::default()] can be used to hash using fixed keys. This works with
[BuildHasherDefault](std::hash::BuildHasherDefault). For example:
```
use std::hash::BuildHasherDefault;
use std::collections::HashMap;
use ahash::AHasher;
let mut m: HashMap<_, _, BuildHasherDefault<AHasher>> = HashMap::default();
# m.insert(12, 34);
```
It is also possible to instantiate [RandomState] directly:
```
use ahash::HashMap;
use ahash::RandomState;
let mut m = HashMap::with_hasher(RandomState::with_seed(42));
# m.insert(1, 2);
```
Or for uses besides a hashhmap:
```
use std::hash::BuildHasher;
use ahash::RandomState;
let hash_builder = RandomState::with_seed(42);
let hash = hash_builder.hash_one("Some Data");
```
There are several constructors for [RandomState] with different ways to supply seeds.
# Convenience wrappers
For convenience, both new-type wrappers and type aliases are provided.
The new type wrappers are called called `AHashMap` and `AHashSet`.
```
use ahash::AHashMap;
let mut map: AHashMap<i32, i32> = AHashMap::new();
map.insert(12, 34);
```
This avoids the need to type "RandomState". (For convenience `From`, `Into`, and `Deref` are provided).
# Aliases
For even less typing and better interop with existing libraries (such as rayon) which require a `std::collection::HashMap` ,
the type aliases [HashMap], [HashSet] are provided.
```
use ahash::{HashMap, HashMapExt};
let mut map: HashMap<i32, i32> = HashMap::new();
map.insert(12, 34);
```
Note the import of [HashMapExt]. This is needed for the constructor.
"##
)]
#![deny(clippy::correctness, clippy::complexity, clippy::perf)]
#![allow(clippy::pedantic, clippy::cast_lossless, clippy::unreadable_literal)]
#![cfg_attr(all(not(test), not(feature = "std")), no_std)]
#![cfg_attr(feature = "specialize", feature(min_specialization))]
#![cfg_attr(feature = "nightly-arm-aes", feature(stdarch_arm_neon_intrinsics))]
#[macro_use]
mod convert;
mod fallback_hash;
cfg_if::cfg_if! {
if #[cfg(any(
all(any(target_arch = "x86", target_arch = "x86_64"), target_feature = "aes", not(miri)),
all(feature = "nightly-arm-aes", target_arch = "aarch64", target_feature = "aes", not(miri)),
all(feature = "nightly-arm-aes", target_arch = "arm", target_feature = "aes", not(miri)),
))] {
mod aes_hash;
pub use crate::aes_hash::AHasher;
} else {
pub use crate::fallback_hash::AHasher;
}
}
cfg_if::cfg_if! {
if #[cfg(feature = "std")] {
mod hash_map;
mod hash_set;
pub use crate::hash_map::AHashMap;
pub use crate::hash_set::AHashSet;
/// [Hasher]: std::hash::Hasher
/// [HashMap]: std::collections::HashMap
/// Type alias for [HashMap]<K, V, ahash::RandomState>
pub type HashMap<K, V> = std::collections::HashMap<K, V, crate::RandomState>;
/// Type alias for [HashSet]<K, ahash::RandomState>
pub type HashSet<K> = std::collections::HashSet<K, crate::RandomState>;
}
}
#[cfg(test)]
mod hash_quality_test;
mod operations;
pub mod random_state;
mod specialize;
pub use crate::random_state::RandomState;
use core::hash::BuildHasher;
use core::hash::Hash;
use core::hash::Hasher;
#[cfg(feature = "std")]
/// A convenience trait that can be used together with the type aliases defined to
/// get access to the `new()` and `with_capacity()` methods for the HashMap type alias.
pub trait HashMapExt {
/// Constructs a new HashMap
fn new() -> Self;
/// Constructs a new HashMap with a given initial capacity
fn with_capacity(capacity: usize) -> Self;
}
#[cfg(feature = "std")]
/// A convenience trait that can be used together with the type aliases defined to
/// get access to the `new()` and `with_capacity()` methods for the HashSet type aliases.
pub trait HashSetExt {
/// Constructs a new HashSet
fn new() -> Self;
/// Constructs a new HashSet with a given initial capacity
fn with_capacity(capacity: usize) -> Self;
}
#[cfg(feature = "std")]
impl<K, V, S> HashMapExt for std::collections::HashMap<K, V, S>
where
S: BuildHasher + Default,
{
fn new() -> Self {
std::collections::HashMap::with_hasher(S::default())
}
fn with_capacity(capacity: usize) -> Self {
std::collections::HashMap::with_capacity_and_hasher(capacity, S::default())
}
}
#[cfg(feature = "std")]
impl<K, S> HashSetExt for std::collections::HashSet<K, S>
where
S: BuildHasher + Default,
{
fn new() -> Self {
std::collections::HashSet::with_hasher(S::default())
}
fn with_capacity(capacity: usize) -> Self {
std::collections::HashSet::with_capacity_and_hasher(capacity, S::default())
}
}
/// Provides a default [Hasher] with fixed keys.
/// This is typically used in conjunction with [BuildHasherDefault] to create
/// [AHasher]s in order to hash the keys of the map.
///
/// Generally it is preferable to use [RandomState] instead, so that different
/// hashmaps will have different keys. However if fixed keys are desirable this
/// may be used instead.
///
/// # Example
/// ```
/// use std::hash::BuildHasherDefault;
/// use ahash::{AHasher, RandomState};
/// use std::collections::HashMap;
///
/// let mut map: HashMap<i32, i32, BuildHasherDefault<AHasher>> = HashMap::default();
/// map.insert(12, 34);
/// ```
///
/// [BuildHasherDefault]: std::hash::BuildHasherDefault
/// [Hasher]: std::hash::Hasher
/// [HashMap]: std::collections::HashMap
impl Default for AHasher {
/// Constructs a new [AHasher] with fixed keys.
/// If `std` is enabled these will be generated upon first invocation.
/// Otherwise if the `compile-time-rng`feature is enabled these will be generated at compile time.
/// If neither of these features are available, hardcoded constants will be used.
///
/// Because the values are fixed, different hashers will all hash elements the same way.
/// This could make hash values predictable, if DOS attacks are a concern. If this behaviour is
/// not required, it may be preferable to use [RandomState] instead.
///
/// # Examples
///
/// ```
/// use ahash::AHasher;
/// use std::hash::Hasher;
///
/// let mut hasher_1 = AHasher::default();
/// let mut hasher_2 = AHasher::default();
///
/// hasher_1.write_u32(1234);
/// hasher_2.write_u32(1234);
///
/// assert_eq!(hasher_1.finish(), hasher_2.finish());
/// ```
#[inline]
fn default() -> AHasher {
RandomState::with_fixed_keys().build_hasher()
}
}
/// Used for specialization. (Sealed)
pub(crate) trait BuildHasherExt: BuildHasher {
#[doc(hidden)]
fn hash_as_u64<T: Hash + ?Sized>(&self, value: &T) -> u64;
#[doc(hidden)]
fn hash_as_fixed_length<T: Hash + ?Sized>(&self, value: &T) -> u64;
#[doc(hidden)]
fn hash_as_str<T: Hash + ?Sized>(&self, value: &T) -> u64;
}
impl<B: BuildHasher> BuildHasherExt for B {
#[inline]
#[cfg(feature = "specialize")]
default fn hash_as_u64<T: Hash + ?Sized>(&self, value: &T) -> u64 {
let mut hasher = self.build_hasher();
value.hash(&mut hasher);
hasher.finish()
}
#[inline]
#[cfg(not(feature = "specialize"))]
fn hash_as_u64<T: Hash + ?Sized>(&self, value: &T) -> u64 {
let mut hasher = self.build_hasher();
value.hash(&mut hasher);
hasher.finish()
}
#[inline]
#[cfg(feature = "specialize")]
default fn hash_as_fixed_length<T: Hash + ?Sized>(&self, value: &T) -> u64 {
let mut hasher = self.build_hasher();
value.hash(&mut hasher);
hasher.finish()
}
#[inline]
#[cfg(not(feature = "specialize"))]
fn hash_as_fixed_length<T: Hash + ?Sized>(&self, value: &T) -> u64 {
let mut hasher = self.build_hasher();
value.hash(&mut hasher);
hasher.finish()
}
#[inline]
#[cfg(feature = "specialize")]
default fn hash_as_str<T: Hash + ?Sized>(&self, value: &T) -> u64 {
let mut hasher = self.build_hasher();
value.hash(&mut hasher);
hasher.finish()
}
#[inline]
#[cfg(not(feature = "specialize"))]
fn hash_as_str<T: Hash + ?Sized>(&self, value: &T) -> u64 {
let mut hasher = self.build_hasher();
value.hash(&mut hasher);
hasher.finish()
}
}
// #[inline(never)]
// #[doc(hidden)]
// pub fn hash_test(input: &[u8]) -> u64 {
// let a = RandomState::with_seeds(11, 22, 33, 44);
// <[u8]>::get_hash(input, &a)
// }
#[cfg(feature = "std")]
#[cfg(test)]
mod test {
use crate::convert::Convert;
use crate::specialize::CallHasher;
use crate::*;
use std::collections::HashMap;
#[test]
fn test_ahash_alias_map_construction() {
let mut map = super::HashMap::with_capacity(1234);
map.insert(1, "test");
}
#[test]
fn test_ahash_alias_set_construction() {
let mut set = super::HashSet::with_capacity(1234);
set.insert(1);
}
#[test]
fn test_default_builder() {
use core::hash::BuildHasherDefault;
let mut map = HashMap::<u32, u64, BuildHasherDefault<AHasher>>::default();
map.insert(1, 3);
}
#[test]
fn test_builder() {
let mut map = HashMap::<u32, u64, RandomState>::default();
map.insert(1, 3);
}
#[test]
fn test_conversion() {
let input: &[u8] = b"dddddddd";
let bytes: u64 = as_array!(input, 8).convert();
assert_eq!(bytes, 0x6464646464646464);
}
#[test]
fn test_non_zero() {
let mut hasher1 = AHasher::new_with_keys(0, 0);
let mut hasher2 = AHasher::new_with_keys(0, 0);
"foo".hash(&mut hasher1);
"bar".hash(&mut hasher2);
assert_ne!(hasher1.finish(), 0);
assert_ne!(hasher2.finish(), 0);
assert_ne!(hasher1.finish(), hasher2.finish());
let mut hasher1 = AHasher::new_with_keys(0, 0);
let mut hasher2 = AHasher::new_with_keys(0, 0);
3_u64.hash(&mut hasher1);
4_u64.hash(&mut hasher2);
assert_ne!(hasher1.finish(), 0);
assert_ne!(hasher2.finish(), 0);
assert_ne!(hasher1.finish(), hasher2.finish());
}
#[test]
fn test_non_zero_specialized() {
let hasher_build = RandomState::with_seeds(0, 0, 0, 0);
let h1 = str::get_hash("foo", &hasher_build);
let h2 = str::get_hash("bar", &hasher_build);
assert_ne!(h1, 0);
assert_ne!(h2, 0);
assert_ne!(h1, h2);
let h1 = u64::get_hash(&3_u64, &hasher_build);
let h2 = u64::get_hash(&4_u64, &hasher_build);
assert_ne!(h1, 0);
assert_ne!(h2, 0);
assert_ne!(h1, h2);
}
#[test]
fn test_ahasher_construction() {
let _ = AHasher::new_with_keys(1234, 5678);
}
}

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use crate::convert::*;
#[allow(unused)]
use zerocopy::transmute;
///This constant comes from Kunth's prng (Empirically it works better than those from splitmix32).
pub(crate) const MULTIPLE: u64 = 6364136223846793005;
/// This is a constant with a lot of special properties found by automated search.
/// See the unit tests below. (Below are alternative values)
#[cfg(all(target_feature = "ssse3", not(miri)))]
const SHUFFLE_MASK: u128 = 0x020a0700_0c01030e_050f0d08_06090b04_u128;
//const SHUFFLE_MASK: u128 = 0x000d0702_0a040301_05080f0c_0e0b0609_u128;
//const SHUFFLE_MASK: u128 = 0x040A0700_030E0106_0D050F08_020B0C09_u128;
#[inline(always)]
#[cfg(feature = "folded_multiply")]
pub(crate) const fn folded_multiply(s: u64, by: u64) -> u64 {
let result = (s as u128).wrapping_mul(by as u128);
((result & 0xffff_ffff_ffff_ffff) as u64) ^ ((result >> 64) as u64)
}
#[inline(always)]
#[cfg(not(feature = "folded_multiply"))]
pub(crate) const fn folded_multiply(s: u64, by: u64) -> u64 {
let b1 = s.wrapping_mul(by.swap_bytes());
let b2 = s.swap_bytes().wrapping_mul(!by);
b1 ^ b2.swap_bytes()
}
/// Given a small (less than 8 byte slice) returns the same data stored in two u32s.
/// (order of and non-duplication of bytes is NOT guaranteed)
#[inline(always)]
pub(crate) fn read_small(data: &[u8]) -> [u64; 2] {
debug_assert!(data.len() <= 8);
if data.len() >= 2 {
if data.len() >= 4 {
//len 4-8
[data.read_u32().0 as u64, data.read_last_u32() as u64]
} else {
//len 2-3
[data.read_u16().0 as u64, data[data.len() - 1] as u64]
}
} else {
if data.len() > 0 {
[data[0] as u64, data[0] as u64]
} else {
[0, 0]
}
}
}
#[inline(always)]
pub(crate) fn shuffle(a: u128) -> u128 {
#[cfg(all(target_feature = "ssse3", not(miri)))]
{
#[cfg(target_arch = "x86")]
use core::arch::x86::*;
#[cfg(target_arch = "x86_64")]
use core::arch::x86_64::*;
unsafe { transmute!(_mm_shuffle_epi8(transmute!(a), transmute!(SHUFFLE_MASK))) }
}
#[cfg(not(all(target_feature = "ssse3", not(miri))))]
{
a.swap_bytes()
}
}
#[allow(unused)] //not used by fallback
#[inline(always)]
pub(crate) fn add_and_shuffle(a: u128, b: u128) -> u128 {
let sum = add_by_64s(a.convert(), b.convert());
shuffle(sum.convert())
}
#[allow(unused)] //not used by fallback
#[inline(always)]
pub(crate) fn shuffle_and_add(base: u128, to_add: u128) -> u128 {
let shuffled: [u64; 2] = shuffle(base).convert();
add_by_64s(shuffled, to_add.convert()).convert()
}
#[cfg(all(any(target_arch = "x86", target_arch = "x86_64"), target_feature = "sse2", not(miri)))]
#[inline(always)]
pub(crate) fn add_by_64s(a: [u64; 2], b: [u64; 2]) -> [u64; 2] {
unsafe {
#[cfg(target_arch = "x86")]
use core::arch::x86::*;
#[cfg(target_arch = "x86_64")]
use core::arch::x86_64::*;
transmute!(_mm_add_epi64(transmute!(a), transmute!(b)))
}
}
#[cfg(not(all(any(target_arch = "x86", target_arch = "x86_64"), target_feature = "sse2", not(miri))))]
#[inline(always)]
pub(crate) fn add_by_64s(a: [u64; 2], b: [u64; 2]) -> [u64; 2] {
[a[0].wrapping_add(b[0]), a[1].wrapping_add(b[1])]
}
#[cfg(all(any(target_arch = "x86", target_arch = "x86_64"), target_feature = "aes", not(miri)))]
#[allow(unused)]
#[inline(always)]
pub(crate) fn aesenc(value: u128, xor: u128) -> u128 {
#[cfg(target_arch = "x86")]
use core::arch::x86::*;
#[cfg(target_arch = "x86_64")]
use core::arch::x86_64::*;
unsafe {
let value = transmute!(value);
transmute!(_mm_aesenc_si128(value, transmute!(xor)))
}
}
#[cfg(any(
all(feature = "nightly-arm-aes", target_arch = "aarch64", target_feature = "aes", not(miri)),
all(feature = "nightly-arm-aes", target_arch = "arm", target_feature = "aes", not(miri)),
))]
#[allow(unused)]
#[inline(always)]
pub(crate) fn aesenc(value: u128, xor: u128) -> u128 {
#[cfg(target_arch = "aarch64")]
use core::arch::aarch64::*;
#[cfg(target_arch = "arm")]
use core::arch::arm::*;
let res = unsafe { vaesmcq_u8(vaeseq_u8(transmute!(value), transmute!(0u128))) };
let value: u128 = transmute!(res);
xor ^ value
}
#[cfg(all(any(target_arch = "x86", target_arch = "x86_64"), target_feature = "aes", not(miri)))]
#[allow(unused)]
#[inline(always)]
pub(crate) fn aesdec(value: u128, xor: u128) -> u128 {
#[cfg(target_arch = "x86")]
use core::arch::x86::*;
#[cfg(target_arch = "x86_64")]
use core::arch::x86_64::*;
unsafe {
let value = transmute!(value);
transmute!(_mm_aesdec_si128(value, transmute!(xor)))
}
}
#[cfg(any(
all(feature = "nightly-arm-aes", target_arch = "aarch64", target_feature = "aes", not(miri)),
all(feature = "nightly-arm-aes", target_arch = "arm", target_feature = "aes", not(miri)),
))]
#[allow(unused)]
#[inline(always)]
pub(crate) fn aesdec(value: u128, xor: u128) -> u128 {
#[cfg(target_arch = "aarch64")]
use core::arch::aarch64::*;
#[cfg(target_arch = "arm")]
use core::arch::arm::*;
let res = unsafe { vaesimcq_u8(vaesdq_u8(transmute!(value), transmute!(0u128))) };
let value: u128 = transmute!(res);
xor ^ value
}
#[allow(unused)]
#[inline(always)]
pub(crate) fn add_in_length(enc: &mut u128, len: u64) {
#[cfg(all(target_arch = "x86_64", target_feature = "sse2", not(miri)))]
{
#[cfg(target_arch = "x86_64")]
use core::arch::x86_64::*;
unsafe {
let enc = enc as *mut u128;
let len = _mm_cvtsi64_si128(len as i64);
let data = _mm_loadu_si128(enc.cast());
let sum = _mm_add_epi64(data, len);
_mm_storeu_si128(enc.cast(), sum);
}
}
#[cfg(not(all(target_arch = "x86_64", target_feature = "sse2", not(miri))))]
{
let mut t: [u64; 2] = enc.convert();
t[0] = t[0].wrapping_add(len);
*enc = t.convert();
}
}
#[cfg(test)]
mod test {
use super::*;
// This is code to search for the shuffle constant
//
//thread_local! { static MASK: Cell<u128> = Cell::new(0); }
//
// fn shuffle(a: u128) -> u128 {
// use std::intrinsics::transmute;
// #[cfg(target_arch = "x86")]
// use core::arch::x86::*;
// #[cfg(target_arch = "x86_64")]
// use core::arch::x86_64::*;
// MASK.with(|mask| {
// unsafe { transmute!(_mm_shuffle_epi8(transmute!(a), transmute!(mask.get()))) }
// })
// }
//
// #[test]
// fn find_shuffle() {
// use rand::prelude::*;
// use SliceRandom;
// use std::panic;
// use std::io::Write;
//
// let mut value: [u8; 16] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ,13, 14, 15];
// let mut rand = thread_rng();
// let mut successful_list = HashMap::new();
// for _attempt in 0..10000000 {
// rand.shuffle(&mut value);
// let test_val = value.convert();
// MASK.with(|mask| {
// mask.set(test_val);
// });
// if let Ok(successful) = panic::catch_unwind(|| {
// test_shuffle_does_not_collide_with_aes();
// test_shuffle_moves_high_bits();
// test_shuffle_moves_every_value();
// //test_shuffle_does_not_loop();
// value
// }) {
// let successful: u128 = successful.convert();
// successful_list.insert(successful, iters_before_loop());
// }
// }
// let write_file = File::create("/tmp/output").unwrap();
// let mut writer = BufWriter::new(&write_file);
//
// for success in successful_list {
// writeln!(writer, "Found successful: {:x?} - {:?}", success.0, success.1);
// }
// }
//
// fn iters_before_loop() -> u32 {
// let numbered = 0x00112233_44556677_8899AABB_CCDDEEFF;
// let mut shuffled = shuffle(numbered);
// let mut count = 0;
// loop {
// // println!("{:>16x}", shuffled);
// if numbered == shuffled {
// break;
// }
// count += 1;
// shuffled = shuffle(shuffled);
// }
// count
// }
#[cfg(all(
any(target_arch = "x86", target_arch = "x86_64"),
target_feature = "ssse3",
target_feature = "aes",
not(miri)
))]
#[test]
fn test_shuffle_does_not_collide_with_aes() {
let mut value: [u8; 16] = [0; 16];
let zero_mask_enc = aesenc(0, 0);
let zero_mask_dec = aesdec(0, 0);
for index in 0..16 {
value[index] = 1;
let excluded_positions_enc: [u8; 16] = aesenc(value.convert(), zero_mask_enc).convert();
let excluded_positions_dec: [u8; 16] = aesdec(value.convert(), zero_mask_dec).convert();
let actual_location: [u8; 16] = shuffle(value.convert()).convert();
for pos in 0..16 {
if actual_location[pos] != 0 {
assert_eq!(
0, excluded_positions_enc[pos],
"Forward Overlap between {:?} and {:?} at {}",
excluded_positions_enc, actual_location, index
);
assert_eq!(
0, excluded_positions_dec[pos],
"Reverse Overlap between {:?} and {:?} at {}",
excluded_positions_dec, actual_location, index
);
}
}
value[index] = 0;
}
}
#[test]
fn test_shuffle_contains_each_value() {
let value: [u8; 16] = 0x00010203_04050607_08090A0B_0C0D0E0F_u128.convert();
let shuffled: [u8; 16] = shuffle(value.convert()).convert();
for index in 0..16_u8 {
assert!(shuffled.contains(&index), "Value is missing {}", index);
}
}
#[test]
fn test_shuffle_moves_every_value() {
let mut value: [u8; 16] = [0; 16];
for index in 0..16 {
value[index] = 1;
let shuffled: [u8; 16] = shuffle(value.convert()).convert();
assert_eq!(0, shuffled[index], "Value is not moved {}", index);
value[index] = 0;
}
}
#[test]
fn test_shuffle_moves_high_bits() {
assert!(
shuffle(1) > (1_u128 << 80),
"Low bits must be moved to other half {:?} -> {:?}",
0,
shuffle(1)
);
assert!(
shuffle(1_u128 << 58) >= (1_u128 << 64),
"High bits must be moved to other half {:?} -> {:?}",
7,
shuffle(1_u128 << 58)
);
assert!(
shuffle(1_u128 << 58) < (1_u128 << 112),
"High bits must not remain high {:?} -> {:?}",
7,
shuffle(1_u128 << 58)
);
assert!(
shuffle(1_u128 << 64) < (1_u128 << 64),
"Low bits must be moved to other half {:?} -> {:?}",
8,
shuffle(1_u128 << 64)
);
assert!(
shuffle(1_u128 << 64) >= (1_u128 << 16),
"Low bits must not remain low {:?} -> {:?}",
8,
shuffle(1_u128 << 64)
);
assert!(
shuffle(1_u128 << 120) < (1_u128 << 50),
"High bits must be moved to low half {:?} -> {:?}",
15,
shuffle(1_u128 << 120)
);
}
#[cfg(all(
any(target_arch = "x86", target_arch = "x86_64"),
target_feature = "ssse3",
not(miri)
))]
#[test]
fn test_shuffle_does_not_loop() {
let numbered = 0x00112233_44556677_8899AABB_CCDDEEFF;
let mut shuffled = shuffle(numbered);
for count in 0..100 {
// println!("{:>16x}", shuffled);
assert_ne!(numbered, shuffled, "Equal after {} vs {:x}", count, shuffled);
shuffled = shuffle(shuffled);
}
}
#[test]
fn test_add_length() {
let mut enc = (u64::MAX as u128) << 64 | 50;
add_in_length(&mut enc, u64::MAX);
assert_eq!(enc >> 64, u64::MAX as u128);
assert_eq!(enc as u64, 49);
}
}

528
third-party/vendor/ahash/src/random_state.rs vendored Normal file
View file

@ -0,0 +1,528 @@
use core::hash::Hash;
cfg_if::cfg_if! {
if #[cfg(any(
all(any(target_arch = "x86", target_arch = "x86_64"), target_feature = "aes", not(miri)),
all(feature = "nightly-arm-aes", target_arch = "aarch64", target_feature = "aes", not(miri)),
all(feature = "nightly-arm-aes", target_arch = "arm", target_feature = "aes", not(miri)),
))] {
use crate::aes_hash::*;
} else {
use crate::fallback_hash::*;
}
}
cfg_if::cfg_if! {
if #[cfg(feature = "specialize")]{
use crate::BuildHasherExt;
}
}
cfg_if::cfg_if! {
if #[cfg(feature = "std")] {
extern crate std as alloc;
} else {
extern crate alloc;
}
}
#[cfg(feature = "atomic-polyfill")]
use atomic_polyfill as atomic;
#[cfg(not(feature = "atomic-polyfill"))]
use core::sync::atomic;
use alloc::boxed::Box;
use atomic::{AtomicUsize, Ordering};
use core::any::{Any, TypeId};
use core::fmt;
use core::hash::BuildHasher;
use core::hash::Hasher;
pub(crate) const PI: [u64; 4] = [
0x243f_6a88_85a3_08d3,
0x1319_8a2e_0370_7344,
0xa409_3822_299f_31d0,
0x082e_fa98_ec4e_6c89,
];
pub(crate) const PI2: [u64; 4] = [
0x4528_21e6_38d0_1377,
0xbe54_66cf_34e9_0c6c,
0xc0ac_29b7_c97c_50dd,
0x3f84_d5b5_b547_0917,
];
cfg_if::cfg_if! {
if #[cfg(all(feature = "compile-time-rng", any(test, fuzzing)))] {
#[inline]
fn get_fixed_seeds() -> &'static [[u64; 4]; 2] {
use const_random::const_random;
const RAND: [[u64; 4]; 2] = [
[
const_random!(u64),
const_random!(u64),
const_random!(u64),
const_random!(u64),
], [
const_random!(u64),
const_random!(u64),
const_random!(u64),
const_random!(u64),
]
];
&RAND
}
} else if #[cfg(all(feature = "runtime-rng", not(fuzzing)))] {
#[inline]
fn get_fixed_seeds() -> &'static [[u64; 4]; 2] {
use crate::convert::Convert;
static SEEDS: OnceBox<[[u64; 4]; 2]> = OnceBox::new();
SEEDS.get_or_init(|| {
let mut result: [u8; 64] = [0; 64];
getrandom::getrandom(&mut result).expect("getrandom::getrandom() failed.");
Box::new(result.convert())
})
}
} else if #[cfg(feature = "compile-time-rng")] {
#[inline]
fn get_fixed_seeds() -> &'static [[u64; 4]; 2] {
use const_random::const_random;
const RAND: [[u64; 4]; 2] = [
[
const_random!(u64),
const_random!(u64),
const_random!(u64),
const_random!(u64),
], [
const_random!(u64),
const_random!(u64),
const_random!(u64),
const_random!(u64),
]
];
&RAND
}
} else {
#[inline]
fn get_fixed_seeds() -> &'static [[u64; 4]; 2] {
&[PI, PI2]
}
}
}
cfg_if::cfg_if! {
if #[cfg(not(all(target_arch = "arm", target_os = "none")))] {
use once_cell::race::OnceBox;
static RAND_SOURCE: OnceBox<Box<dyn RandomSource + Send + Sync>> = OnceBox::new();
}
}
/// A supplier of Randomness used for different hashers.
/// See [set_random_source].
///
/// If [set_random_source] aHash will default to the best available source of randomness.
/// In order this is:
/// 1. OS provided random number generator (available if the `runtime-rng` flag is enabled which it is by default) - This should be very strong.
/// 2. Strong compile time random numbers used to permute a static "counter". (available if `compile-time-rng` is enabled.
/// __Enabling this is recommended if `runtime-rng` is not possible__)
/// 3. A static counter that adds the memory address of each [RandomState] created permuted with fixed constants.
/// (Similar to above but with fixed keys) - This is the weakest option. The strength of this heavily depends on whether or not ASLR is enabled.
/// (Rust enables ASLR by default)
pub trait RandomSource {
fn gen_hasher_seed(&self) -> usize;
}
struct DefaultRandomSource {
counter: AtomicUsize,
}
impl DefaultRandomSource {
fn new() -> DefaultRandomSource {
DefaultRandomSource {
counter: AtomicUsize::new(&PI as *const _ as usize),
}
}
#[cfg(all(target_arch = "arm", target_os = "none"))]
const fn default() -> DefaultRandomSource {
DefaultRandomSource {
counter: AtomicUsize::new(PI[3] as usize),
}
}
}
impl RandomSource for DefaultRandomSource {
cfg_if::cfg_if! {
if #[cfg(all(target_arch = "arm", target_os = "none"))] {
fn gen_hasher_seed(&self) -> usize {
let stack = self as *const _ as usize;
let previous = self.counter.load(Ordering::Relaxed);
let new = previous.wrapping_add(stack);
self.counter.store(new, Ordering::Relaxed);
new
}
} else {
fn gen_hasher_seed(&self) -> usize {
let stack = self as *const _ as usize;
self.counter.fetch_add(stack, Ordering::Relaxed)
}
}
}
}
cfg_if::cfg_if! {
if #[cfg(all(target_arch = "arm", target_os = "none"))] {
#[inline]
fn get_src() -> &'static dyn RandomSource {
static RAND_SOURCE: DefaultRandomSource = DefaultRandomSource::default();
&RAND_SOURCE
}
} else {
/// Provides an optional way to manually supply a source of randomness for Hasher keys.
///
/// The provided [RandomSource] will be used to be used as a source of randomness by [RandomState] to generate new states.
/// If this method is not invoked the standard source of randomness is used as described in the Readme.
///
/// The source of randomness can only be set once, and must be set before the first RandomState is created.
/// If the source has already been specified `Err` is returned with a `bool` indicating if the set failed because
/// method was previously invoked (true) or if the default source is already being used (false).
#[cfg(not(all(target_arch = "arm", target_os = "none")))]
pub fn set_random_source(source: impl RandomSource + Send + Sync + 'static) -> Result<(), bool> {
RAND_SOURCE.set(Box::new(Box::new(source))).map_err(|s| s.as_ref().type_id() != TypeId::of::<&DefaultRandomSource>())
}
#[inline]
fn get_src() -> &'static dyn RandomSource {
RAND_SOURCE.get_or_init(|| Box::new(Box::new(DefaultRandomSource::new()))).as_ref()
}
}
}
/// Provides a [Hasher] factory. This is typically used (e.g. by [HashMap]) to create
/// [AHasher]s in order to hash the keys of the map. See `build_hasher` below.
///
/// [build_hasher]: ahash::
/// [Hasher]: std::hash::Hasher
/// [BuildHasher]: std::hash::BuildHasher
/// [HashMap]: std::collections::HashMap
///
/// There are multiple constructors each is documented in more detail below:
///
/// | Constructor | Dynamically random? | Seed |
/// |---------------|---------------------|------|
/// |`new` | Each instance unique|_[RandomSource]_|
/// |`generate_with`| Each instance unique|`u64` x 4 + [RandomSource]|
/// |`with_seed` | Fixed per process |`u64` + static random number|
/// |`with_seeds` | Fixed |`u64` x 4|
///
#[derive(Clone)]
pub struct RandomState {
pub(crate) k0: u64,
pub(crate) k1: u64,
pub(crate) k2: u64,
pub(crate) k3: u64,
}
impl fmt::Debug for RandomState {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.pad("RandomState { .. }")
}
}
impl RandomState {
/// Create a new `RandomState` `BuildHasher` using random keys.
///
/// Each instance will have a unique set of keys derived from [RandomSource].
///
#[inline]
pub fn new() -> RandomState {
let src = get_src();
let fixed = get_fixed_seeds();
Self::from_keys(&fixed[0], &fixed[1], src.gen_hasher_seed())
}
/// Create a new `RandomState` `BuildHasher` based on the provided seeds, but in such a way
/// that each time it is called the resulting state will be different and of high quality.
/// This allows fixed constant or poor quality seeds to be provided without the problem of different
/// `BuildHasher`s being identical or weak.
///
/// This is done via permuting the provided values with the value of a static counter and memory address.
/// (This makes this method somewhat more expensive than `with_seeds` below which does not do this).
///
/// The provided values (k0-k3) do not need to be of high quality but they should not all be the same value.
#[inline]
pub fn generate_with(k0: u64, k1: u64, k2: u64, k3: u64) -> RandomState {
let src = get_src();
let fixed = get_fixed_seeds();
RandomState::from_keys(&fixed[0], &[k0, k1, k2, k3], src.gen_hasher_seed())
}
fn from_keys(a: &[u64; 4], b: &[u64; 4], c: usize) -> RandomState {
let &[k0, k1, k2, k3] = a;
let mut hasher = AHasher::from_random_state(&RandomState { k0, k1, k2, k3 });
hasher.write_usize(c);
let mix = |l: u64, r: u64| {
let mut h = hasher.clone();
h.write_u64(l);
h.write_u64(r);
h.finish()
};
RandomState {
k0: mix(b[0], b[2]),
k1: mix(b[1], b[3]),
k2: mix(b[2], b[1]),
k3: mix(b[3], b[0]),
}
}
/// Internal. Used by Default.
#[inline]
pub(crate) fn with_fixed_keys() -> RandomState {
let [k0, k1, k2, k3] = get_fixed_seeds()[0];
RandomState { k0, k1, k2, k3 }
}
/// Build a `RandomState` from a single key. The provided key does not need to be of high quality,
/// but all `RandomState`s created from the same key will produce identical hashers.
/// (In contrast to `generate_with` above)
///
/// This allows for explicitly setting the seed to be used.
///
/// Note: This method does not require the provided seed to be strong.
#[inline]
pub fn with_seed(key: usize) -> RandomState {
let fixed = get_fixed_seeds();
RandomState::from_keys(&fixed[0], &fixed[1], key)
}
/// Allows for explicitly setting the seeds to used.
/// All `RandomState`s created with the same set of keys key will produce identical hashers.
/// (In contrast to `generate_with` above)
///
/// Note: If DOS resistance is desired one of these should be a decent quality random number.
/// If 4 high quality random number are not cheaply available this method is robust against 0s being passed for
/// one or more of the parameters or the same value being passed for more than one parameter.
/// It is recommended to pass numbers in order from highest to lowest quality (if there is any difference).
#[inline]
pub const fn with_seeds(k0: u64, k1: u64, k2: u64, k3: u64) -> RandomState {
RandomState {
k0: k0 ^ PI2[0],
k1: k1 ^ PI2[1],
k2: k2 ^ PI2[2],
k3: k3 ^ PI2[3],
}
}
/// Calculates the hash of a single value. This provides a more convenient (and faster) way to obtain a hash:
/// For example:
#[cfg_attr(
feature = "std",
doc = r##" # Examples
```
use std::hash::BuildHasher;
use ahash::RandomState;
let hash_builder = RandomState::new();
let hash = hash_builder.hash_one("Some Data");
```
"##
)]
/// This is similar to:
#[cfg_attr(
feature = "std",
doc = r##" # Examples
```
use std::hash::{BuildHasher, Hash, Hasher};
use ahash::RandomState;
let hash_builder = RandomState::new();
let mut hasher = hash_builder.build_hasher();
"Some Data".hash(&mut hasher);
let hash = hasher.finish();
```
"##
)]
/// (Note that these two ways to get a hash may not produce the same value for the same data)
///
/// This is intended as a convenience for code which *consumes* hashes, such
/// as the implementation of a hash table or in unit tests that check
/// whether a custom [`Hash`] implementation behaves as expected.
///
/// This must not be used in any code which *creates* hashes, such as in an
/// implementation of [`Hash`]. The way to create a combined hash of
/// multiple values is to call [`Hash::hash`] multiple times using the same
/// [`Hasher`], not to call this method repeatedly and combine the results.
#[inline]
pub fn hash_one<T: Hash>(&self, x: T) -> u64
where
Self: Sized,
{
use crate::specialize::CallHasher;
T::get_hash(&x, self)
}
}
/// Creates an instance of RandomState using keys obtained from the random number generator.
/// Each instance created in this way will have a unique set of keys. (But the resulting instance
/// can be used to create many hashers each or which will have the same keys.)
///
/// This is the same as [RandomState::new()]
///
/// NOTE: For safety this trait impl is only available available if either of the flags `runtime-rng` (on by default) or
/// `compile-time-rng` are enabled. This is to prevent weakly keyed maps from being accidentally created. Instead one of
/// constructors for [RandomState] must be used.
#[cfg(any(feature = "compile-time-rng", feature = "runtime-rng", feature = "no-rng"))]
impl Default for RandomState {
#[inline]
fn default() -> Self {
Self::new()
}
}
impl BuildHasher for RandomState {
type Hasher = AHasher;
/// Constructs a new [AHasher] with keys based on this [RandomState] object.
/// This means that two different [RandomState]s will will generate
/// [AHasher]s that will return different hashcodes, but [Hasher]s created from the same [BuildHasher]
/// will generate the same hashes for the same input data.
///
#[cfg_attr(
feature = "std",
doc = r##" # Examples
```
use ahash::{AHasher, RandomState};
use std::hash::{Hasher, BuildHasher};
let build_hasher = RandomState::new();
let mut hasher_1 = build_hasher.build_hasher();
let mut hasher_2 = build_hasher.build_hasher();
hasher_1.write_u32(1234);
hasher_2.write_u32(1234);
assert_eq!(hasher_1.finish(), hasher_2.finish());
let other_build_hasher = RandomState::new();
let mut different_hasher = other_build_hasher.build_hasher();
different_hasher.write_u32(1234);
assert_ne!(different_hasher.finish(), hasher_1.finish());
```
"##
)]
/// [Hasher]: std::hash::Hasher
/// [BuildHasher]: std::hash::BuildHasher
/// [HashMap]: std::collections::HashMap
#[inline]
fn build_hasher(&self) -> AHasher {
AHasher::from_random_state(self)
}
/// Calculates the hash of a single value. This provides a more convenient (and faster) way to obtain a hash:
/// For example:
#[cfg_attr(
feature = "std",
doc = r##" # Examples
```
use std::hash::BuildHasher;
use ahash::RandomState;
let hash_builder = RandomState::new();
let hash = hash_builder.hash_one("Some Data");
```
"##
)]
/// This is similar to:
#[cfg_attr(
feature = "std",
doc = r##" # Examples
```
use std::hash::{BuildHasher, Hash, Hasher};
use ahash::RandomState;
let hash_builder = RandomState::new();
let mut hasher = hash_builder.build_hasher();
"Some Data".hash(&mut hasher);
let hash = hasher.finish();
```
"##
)]
/// (Note that these two ways to get a hash may not produce the same value for the same data)
///
/// This is intended as a convenience for code which *consumes* hashes, such
/// as the implementation of a hash table or in unit tests that check
/// whether a custom [`Hash`] implementation behaves as expected.
///
/// This must not be used in any code which *creates* hashes, such as in an
/// implementation of [`Hash`]. The way to create a combined hash of
/// multiple values is to call [`Hash::hash`] multiple times using the same
/// [`Hasher`], not to call this method repeatedly and combine the results.
#[cfg(feature = "specialize")]
#[inline]
fn hash_one<T: Hash>(&self, x: T) -> u64 {
RandomState::hash_one(self, x)
}
}
#[cfg(feature = "specialize")]
impl BuildHasherExt for RandomState {
#[inline]
fn hash_as_u64<T: Hash + ?Sized>(&self, value: &T) -> u64 {
let mut hasher = AHasherU64 {
buffer: self.k1,
pad: self.k0,
};
value.hash(&mut hasher);
hasher.finish()
}
#[inline]
fn hash_as_fixed_length<T: Hash + ?Sized>(&self, value: &T) -> u64 {
let mut hasher = AHasherFixed(self.build_hasher());
value.hash(&mut hasher);
hasher.finish()
}
#[inline]
fn hash_as_str<T: Hash + ?Sized>(&self, value: &T) -> u64 {
let mut hasher = AHasherStr(self.build_hasher());
value.hash(&mut hasher);
hasher.finish()
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test_unique() {
let a = RandomState::generate_with(1, 2, 3, 4);
let b = RandomState::generate_with(1, 2, 3, 4);
assert_ne!(a.build_hasher().finish(), b.build_hasher().finish());
}
#[cfg(all(feature = "runtime-rng", not(all(feature = "compile-time-rng", test))))]
#[test]
fn test_not_pi() {
assert_ne!(PI, get_fixed_seeds()[0]);
}
#[cfg(all(feature = "compile-time-rng", any(not(feature = "runtime-rng"), test)))]
#[test]
fn test_not_pi_const() {
assert_ne!(PI, get_fixed_seeds()[0]);
}
#[cfg(all(not(feature = "runtime-rng"), not(feature = "compile-time-rng")))]
#[test]
fn test_pi() {
assert_eq!(PI, get_fixed_seeds()[0]);
}
#[test]
fn test_with_seeds_const() {
const _CONST_RANDOM_STATE: RandomState = RandomState::with_seeds(17, 19, 21, 23);
}
}

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use core::hash::BuildHasher;
use core::hash::Hash;
use core::hash::Hasher;
#[cfg(not(feature = "std"))]
extern crate alloc;
#[cfg(feature = "std")]
extern crate std as alloc;
#[cfg(feature = "specialize")]
use crate::BuildHasherExt;
#[cfg(feature = "specialize")]
use alloc::string::String;
#[cfg(feature = "specialize")]
use alloc::vec::Vec;
/// Provides a way to get an optimized hasher for a given data type.
/// Rather than using a Hasher generically which can hash any value, this provides a way to get a specialized hash
/// for a specific type. So this may be faster for primitive types.
pub(crate) trait CallHasher {
fn get_hash<H: Hash + ?Sized, B: BuildHasher>(value: &H, build_hasher: &B) -> u64;
}
#[cfg(not(feature = "specialize"))]
impl<T> CallHasher for T
where
T: Hash + ?Sized,
{
#[inline]
fn get_hash<H: Hash + ?Sized, B: BuildHasher>(value: &H, build_hasher: &B) -> u64 {
let mut hasher = build_hasher.build_hasher();
value.hash(&mut hasher);
hasher.finish()
}
}
#[cfg(feature = "specialize")]
impl<T> CallHasher for T
where
T: Hash + ?Sized,
{
#[inline]
default fn get_hash<H: Hash + ?Sized, B: BuildHasher>(value: &H, build_hasher: &B) -> u64 {
let mut hasher = build_hasher.build_hasher();
value.hash(&mut hasher);
hasher.finish()
}
}
macro_rules! call_hasher_impl {
($typ:ty) => {
#[cfg(feature = "specialize")]
impl CallHasher for $typ {
#[inline]
fn get_hash<H: Hash + ?Sized, B: BuildHasher>(value: &H, build_hasher: &B) -> u64 {
build_hasher.hash_as_u64(value)
}
}
};
}
call_hasher_impl!(u8);
call_hasher_impl!(u16);
call_hasher_impl!(u32);
call_hasher_impl!(u64);
call_hasher_impl!(i8);
call_hasher_impl!(i16);
call_hasher_impl!(i32);
call_hasher_impl!(i64);
#[cfg(feature = "specialize")]
impl CallHasher for u128 {
#[inline]
fn get_hash<H: Hash + ?Sized, B: BuildHasher>(value: &H, build_hasher: &B) -> u64 {
build_hasher.hash_as_fixed_length(value)
}
}
#[cfg(feature = "specialize")]
impl CallHasher for i128 {
#[inline]
fn get_hash<H: Hash + ?Sized, B: BuildHasher>(value: &H, build_hasher: &B) -> u64 {
build_hasher.hash_as_fixed_length(value)
}
}
#[cfg(feature = "specialize")]
impl CallHasher for usize {
#[inline]
fn get_hash<H: Hash + ?Sized, B: BuildHasher>(value: &H, build_hasher: &B) -> u64 {
build_hasher.hash_as_fixed_length(value)
}
}
#[cfg(feature = "specialize")]
impl CallHasher for isize {
#[inline]
fn get_hash<H: Hash + ?Sized, B: BuildHasher>(value: &H, build_hasher: &B) -> u64 {
build_hasher.hash_as_fixed_length(value)
}
}
#[cfg(feature = "specialize")]
impl CallHasher for [u8] {
#[inline]
fn get_hash<H: Hash + ?Sized, B: BuildHasher>(value: &H, build_hasher: &B) -> u64 {
build_hasher.hash_as_str(value)
}
}
#[cfg(feature = "specialize")]
impl CallHasher for Vec<u8> {
#[inline]
fn get_hash<H: Hash + ?Sized, B: BuildHasher>(value: &H, build_hasher: &B) -> u64 {
build_hasher.hash_as_str(value)
}
}
#[cfg(feature = "specialize")]
impl CallHasher for str {
#[inline]
fn get_hash<H: Hash + ?Sized, B: BuildHasher>(value: &H, build_hasher: &B) -> u64 {
build_hasher.hash_as_str(value)
}
}
#[cfg(all(feature = "specialize"))]
impl CallHasher for String {
#[inline]
fn get_hash<H: Hash + ?Sized, B: BuildHasher>(value: &H, build_hasher: &B) -> u64 {
build_hasher.hash_as_str(value)
}
}
#[cfg(test)]
mod test {
use super::*;
use crate::*;
#[test]
#[cfg(feature = "specialize")]
pub fn test_specialized_invoked() {
let build_hasher = RandomState::with_seeds(1, 2, 3, 4);
let shortened = u64::get_hash(&0, &build_hasher);
let mut hasher = AHasher::new_with_keys(1, 2);
0_u64.hash(&mut hasher);
assert_ne!(hasher.finish(), shortened);
}
/// Tests that some non-trivial transformation takes place.
#[test]
pub fn test_input_processed() {
let build_hasher = RandomState::with_seeds(2, 2, 2, 2);
assert_ne!(0, u64::get_hash(&0, &build_hasher));
assert_ne!(1, u64::get_hash(&0, &build_hasher));
assert_ne!(2, u64::get_hash(&0, &build_hasher));
assert_ne!(3, u64::get_hash(&0, &build_hasher));
assert_ne!(4, u64::get_hash(&0, &build_hasher));
assert_ne!(5, u64::get_hash(&0, &build_hasher));
assert_ne!(0, u64::get_hash(&1, &build_hasher));
assert_ne!(1, u64::get_hash(&1, &build_hasher));
assert_ne!(2, u64::get_hash(&1, &build_hasher));
assert_ne!(3, u64::get_hash(&1, &build_hasher));
assert_ne!(4, u64::get_hash(&1, &build_hasher));
assert_ne!(5, u64::get_hash(&1, &build_hasher));
let xored = u64::get_hash(&0, &build_hasher) ^ u64::get_hash(&1, &build_hasher);
assert_ne!(0, xored);
assert_ne!(1, xored);
assert_ne!(2, xored);
assert_ne!(3, xored);
assert_ne!(4, xored);
assert_ne!(5, xored);
}
#[test]
pub fn test_ref_independent() {
let build_hasher = RandomState::with_seeds(1, 2, 3, 4);
assert_eq!(u8::get_hash(&&1, &build_hasher), u8::get_hash(&1, &build_hasher));
assert_eq!(u16::get_hash(&&2, &build_hasher), u16::get_hash(&2, &build_hasher));
assert_eq!(u32::get_hash(&&3, &build_hasher), u32::get_hash(&3, &build_hasher));
assert_eq!(u64::get_hash(&&4, &build_hasher), u64::get_hash(&4, &build_hasher));
assert_eq!(u128::get_hash(&&5, &build_hasher), u128::get_hash(&5, &build_hasher));
assert_eq!(
str::get_hash(&"test", &build_hasher),
str::get_hash("test", &build_hasher)
);
assert_eq!(
str::get_hash(&"test", &build_hasher),
String::get_hash(&"test".to_string(), &build_hasher)
);
#[cfg(feature = "specialize")]
assert_eq!(
str::get_hash(&"test", &build_hasher),
<[u8]>::get_hash("test".as_bytes(), &build_hasher)
);
let build_hasher = RandomState::with_seeds(10, 20, 30, 40);
assert_eq!(u8::get_hash(&&&1, &build_hasher), u8::get_hash(&1, &build_hasher));
assert_eq!(u16::get_hash(&&&2, &build_hasher), u16::get_hash(&2, &build_hasher));
assert_eq!(u32::get_hash(&&&3, &build_hasher), u32::get_hash(&3, &build_hasher));
assert_eq!(u64::get_hash(&&&4, &build_hasher), u64::get_hash(&4, &build_hasher));
assert_eq!(u128::get_hash(&&&5, &build_hasher), u128::get_hash(&5, &build_hasher));
assert_eq!(
str::get_hash(&&"test", &build_hasher),
str::get_hash("test", &build_hasher)
);
assert_eq!(
str::get_hash(&&"test", &build_hasher),
String::get_hash(&"test".to_string(), &build_hasher)
);
#[cfg(feature = "specialize")]
assert_eq!(
str::get_hash(&&"test", &build_hasher),
<[u8]>::get_hash(&"test".to_string().into_bytes(), &build_hasher)
);
}
}

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#![cfg_attr(feature = "specialize", feature(build_hasher_simple_hash_one))]
use ahash::{AHasher, RandomState};
use criterion::*;
use fxhash::FxHasher;
use rand::Rng;
use std::collections::hash_map::DefaultHasher;
use std::hash::{BuildHasherDefault, Hash, Hasher};
// Needs to be in sync with `src/lib.rs`
const AHASH_IMPL: &str = if cfg!(any(
all(
any(target_arch = "x86", target_arch = "x86_64"),
target_feature = "aes",
not(miri),
),
all(feature = "nightly-arm-aes", target_arch = "aarch64", target_feature = "aes", not(miri)),
all(
feature = "nightly-arm-aes",
target_arch = "arm",
target_feature = "aes",
not(miri)
),
)) {
"aeshash"
} else {
"fallbackhash"
};
fn ahash<H: Hash>(b: &H) -> u64 {
let build_hasher = RandomState::with_seeds(1, 2, 3, 4);
build_hasher.hash_one(b)
}
fn fnvhash<H: Hash>(b: &H) -> u64 {
let mut hasher = fnv::FnvHasher::default();
b.hash(&mut hasher);
hasher.finish()
}
fn siphash<H: Hash>(b: &H) -> u64 {
let mut hasher = DefaultHasher::default();
b.hash(&mut hasher);
hasher.finish()
}
fn fxhash<H: Hash>(b: &H) -> u64 {
let mut hasher = FxHasher::default();
b.hash(&mut hasher);
hasher.finish()
}
fn seahash<H: Hash>(b: &H) -> u64 {
let mut hasher = seahash::SeaHasher::default();
b.hash(&mut hasher);
hasher.finish()
}
const STRING_LENGTHS: [u32; 12] = [1, 3, 4, 7, 8, 15, 16, 24, 33, 68, 132, 1024];
fn gen_strings() -> Vec<String> {
STRING_LENGTHS
.iter()
.map(|len| {
let mut string = String::default();
for pos in 1..=*len {
let c = (48 + (pos % 10) as u8) as char;
string.push(c);
}
string
})
.collect()
}
macro_rules! bench_inputs {
($group:ident, $hash:ident) => {
// Number of iterations per batch should be high enough to hide timing overhead.
let size = BatchSize::NumIterations(50_000);
let mut rng = rand::thread_rng();
$group.bench_function("u8", |b| b.iter_batched(|| rng.gen::<u8>(), |v| $hash(&v), size));
$group.bench_function("u16", |b| b.iter_batched(|| rng.gen::<u16>(), |v| $hash(&v), size));
$group.bench_function("u32", |b| b.iter_batched(|| rng.gen::<u32>(), |v| $hash(&v), size));
$group.bench_function("u64", |b| b.iter_batched(|| rng.gen::<u64>(), |v| $hash(&v), size));
$group.bench_function("u128", |b| b.iter_batched(|| rng.gen::<u128>(), |v| $hash(&v), size));
$group.bench_with_input("strings", &gen_strings(), |b, s| b.iter(|| $hash(black_box(s))));
};
}
fn bench_ahash(c: &mut Criterion) {
let mut group = c.benchmark_group(AHASH_IMPL);
bench_inputs!(group, ahash);
}
fn bench_fx(c: &mut Criterion) {
let mut group = c.benchmark_group("fx");
bench_inputs!(group, fxhash);
}
fn bench_fnv(c: &mut Criterion) {
let mut group = c.benchmark_group("fnv");
bench_inputs!(group, fnvhash);
}
fn bench_sea(c: &mut Criterion) {
let mut group = c.benchmark_group("sea");
bench_inputs!(group, seahash);
}
fn bench_sip(c: &mut Criterion) {
let mut group = c.benchmark_group("sip");
bench_inputs!(group, siphash);
}
fn bench_map(c: &mut Criterion) {
#[cfg(feature = "std")]
{
let mut group = c.benchmark_group("map");
group.bench_function("aHash-alias", |b| {
b.iter(|| {
let hm: ahash::HashMap<i32, i32> = (0..1_000_000).map(|i| (i, i)).collect();
let mut sum = 0;
for i in 0..1_000_000 {
if let Some(x) = hm.get(&i) {
sum += x;
}
}
})
});
group.bench_function("aHash-hashBrown", |b| {
b.iter(|| {
let hm: hashbrown::HashMap<i32, i32> = (0..1_000_000).map(|i| (i, i)).collect();
let mut sum = 0;
for i in 0..1_000_000 {
if let Some(x) = hm.get(&i) {
sum += x;
}
}
})
});
group.bench_function("aHash-hashBrown-explicit", |b| {
b.iter(|| {
let hm: hashbrown::HashMap<i32, i32, RandomState> = (0..1_000_000).map(|i| (i, i)).collect();
let mut sum = 0;
for i in 0..1_000_000 {
if let Some(x) = hm.get(&i) {
sum += x;
}
}
})
});
group.bench_function("aHash-wrapper", |b| {
b.iter(|| {
let hm: ahash::AHashMap<i32, i32> = (0..1_000_000).map(|i| (i, i)).collect();
let mut sum = 0;
for i in 0..1_000_000 {
if let Some(x) = hm.get(&i) {
sum += x;
}
}
})
});
group.bench_function("aHash-rand", |b| {
b.iter(|| {
let hm: std::collections::HashMap<i32, i32, RandomState> = (0..1_000_000).map(|i| (i, i)).collect();
let mut sum = 0;
for i in 0..1_000_000 {
if let Some(x) = hm.get(&i) {
sum += x;
}
}
})
});
group.bench_function("aHash-default", |b| {
b.iter(|| {
let hm: std::collections::HashMap<i32, i32, BuildHasherDefault<AHasher>> =
(0..1_000_000).map(|i| (i, i)).collect();
let mut sum = 0;
for i in 0..1_000_000 {
if let Some(x) = hm.get(&i) {
sum += x;
}
}
})
});
}
}
criterion_main!(benches);
criterion_group!(
benches,
bench_ahash,
bench_fx,
bench_fnv,
bench_sea,
bench_sip,
bench_map
);

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#![cfg_attr(feature = "specialize", feature(build_hasher_simple_hash_one))]
use std::hash::{BuildHasher, Hash, Hasher};
use ahash::RandomState;
use criterion::*;
use fxhash::FxHasher;
fn gen_word_pairs() -> Vec<String> {
let words: Vec<_> = r#"
a, ability, able, about, above, accept, according, account, across, act, action,
activity, actually, add, address, administration, admit, adult, affect, after,
again, against, age, agency, agent, ago, agree, agreement, ahead, air, all,
allow, almost, alone, along, already, also, although, always, American, among,
amount, analysis, and, animal, another, answer, any, anyone, anything, appear,
apply, approach, area, argue, arm, around, arrive, art, article, artist, as,
ask, assume, at, attack, attention, attorney, audience, author, authority,
available, avoid, away, baby, back, bad, bag, ball, bank, bar, base, be, beat,
beautiful, because, become, bed, before, begin, behavior, behind, believe,
benefit, best, better, between, beyond, big, bill, billion, bit, black, blood,
blue, board, body, book, born, both, box, boy, break, bring, brother, budget,
build, building, business, but, buy, by, call, camera, campaign, can, cancer,
candidate, capital, car, card, care, career, carry, case, catch, cause, cell,
center, central, century, certain, certainly, chair, challenge, chance, change,
character, charge, check, child, choice, choose, church, citizen, city, civil,
claim, class, clear, clearly, close, coach, cold, collection, college, color,
come, commercial, common, community, company, compare, computer, concern,
condition, conference, Congress, consider, consumer, contain, continue, control,
cost, could, country, couple, course, court, cover, create, crime, cultural,
culture, cup, current, customer, cut, dark, data, daughter, day, dead, deal,
death, debate, decade, decide, decision, deep, defense, degree, Democrat,
democratic, describe, design, despite, detail, determine, develop, development,
die, difference, different, difficult, dinner, direction, director, discover,
discuss, discussion, disease, do, doctor, dog, door, down, draw, dream, drive,
drop, drug, during, each, early, east, easy, eat, economic, economy, edge,
education, effect, effort, eight, either, election, else, employee, end, energy,
enjoy, enough, enter, entire, environment, environmental, especially, establish,
even, evening, event, ever, every, everybody, everyone, everything, evidence,
exactly, example, executive, exist, expect, experience, expert, explain, eye,
face, fact, factor, fail, fall, family, far, fast, father, fear, federal, feel,
feeling, few, field, fight, figure, fill, film, final, finally, financial, find,
fine, finger, finish, fire, firm, first, fish, five, floor, fly, focus, follow,
food, foot, for, force, foreign, forget, form, former, forward, four, free,
friend, from, front, full, fund, future, game, garden, gas, general, generation,
get, girl, give, glass, go, goal, good, government, great, green, ground, group,
grow, growth, guess, gun, guy, hair, half, hand, hang, happen, happy, hard,
have, he, head, health, hear, heart, heat, heavy, help, her, here, herself,
high, him, himself, his, history, hit, hold, home, hope, hospital, hot, hotel,
hour, house, how, however, huge, human, hundred, husband, I, idea, identify, if,
image, imagine, impact, important, improve, in, include, including, increase,
indeed, indicate, individual, industry, information, inside, instead,
institution, interest, interesting, international, interview, into, investment,
involve, issue, it, item, its, itself, job, join, just, keep, key, kid, kill,
kind, kitchen, know, knowledge, land, language, large, last, late, later, laugh,
law, lawyer, lay, lead, leader, learn, least, leave, left, leg, legal, less,
let, letter, level, lie, life, light, like, likely, line, list, listen, little,
live, local, long, look, lose, loss, lot, love, low, machine, magazine, main,
maintain, major, majority, make, man, manage, management, manager, many, market,
marriage, material, matter, may, maybe, me, mean, measure, media, medical, meet,
meeting, member, memory, mention, message, method, middle, might, military,
million, mind, minute, miss, mission, model, modern, moment, money, month, more,
morning, most, mother, mouth, move, movement, movie, Mr, Mrs, much, music, must,
my, myself, name, nation, national, natural, nature, near, nearly, necessary,
need, network, never, new, news, newspaper, next, nice, night, no, none, nor,
north, not, note, nothing, notice, now, n't, number, occur, of, off, offer,
office, officer, official, often, oh, oil, ok, old, on, once, one, only, onto,
open, operation, opportunity, option, or, order, organization, other, others,
our, out, outside, over, own, owner, page, pain, painting, paper, parent, part,
participant, particular, particularly, partner, party, pass, past, patient,
pattern, pay, peace, people, per, perform, performance, perhaps, period, person,
personal, phone, physical, pick, picture, piece, place, plan, plant, play,
player, PM, point, police, policy, political, politics, poor, popular,
population, position, positive, possible, power, practice, prepare, present,
president, pressure, pretty, prevent, price, private, probably, problem,
process, produce, product, production, professional, professor, program,
project, property, protect, prove, provide, public, pull, purpose, push, put,
quality, question, quickly, quite, race, radio, raise, range, rate, rather,
reach, read, ready, real, reality, realize, really, reason, receive, recent,
recently, recognize, record, red, reduce, reflect, region, relate, relationship,
religious, remain, remember, remove, report, represent, Republican, require,
research, resource, respond, response, responsibility, rest, result, return,
reveal, rich, right, rise, risk, road, rock, role, room, rule, run, safe, same,
save, say, scene, school, science, scientist, score, sea, season, seat, second,
section, security, see, seek, seem, sell, send, senior, sense, series, serious,
serve, service, set, seven, several, sex, sexual, shake, share, she, shoot,
short, shot, should, shoulder, show, side, sign, significant, similar, simple,
simply, since, sing, single, sister, sit, site, situation, six, size, skill,
skin, small, smile, so, social, society, soldier, some, somebody, someone,
something, sometimes, son, song, soon, sort, sound, source, south, southern,
space, speak, special, specific, speech, spend, sport, spring, staff, stage,
stand, standard, star, start, state, statement, station, stay, step, still,
stock, stop, store, story, strategy, street, strong, structure, student, study,
stuff, style, subject, success, successful, such, suddenly, suffer, suggest,
summer, support, sure, surface, system, table, take, talk, task, tax, teach,
teacher, team, technology, television, tell, ten, tend, term, test, than, thank,
that, the, their, them, themselves, then, theory, there, these, they, thing,
think, third, this, those, though, thought, thousand, threat, three, through,
throughout, throw, thus, time, to, today, together, tonight, too, top, total,
tough, toward, town, trade, traditional, training, travel, treat, treatment,
tree, trial, trip, trouble, true, truth, try, turn, TV, two, type, under,
understand, unit, until, up, upon, us, use, usually, value, various, very,
victim, view, violence, visit, voice, vote, wait, walk, wall, want, war, watch,
water, way, we, weapon, wear, week, weight, well, west, western, what, whatever,
when, where, whether, which, while, white, who, whole, whom, whose, why, wide,
wife, will, win, wind, window, wish, with, within, without, woman, wonder, word,
work, worker, world, worry, would, write, writer, wrong, yard, yeah, year, yes,
yet, you, young, your, yourself"#
.split(',')
.map(|word| word.trim())
.collect();
let mut word_pairs: Vec<_> = Vec::new();
for word in &words {
for other_word in &words {
word_pairs.push(word.to_string() + " " + other_word);
}
}
assert_eq!(1_000_000, word_pairs.len());
word_pairs
}
#[allow(unused)] // False positive
fn test_hash_common_words<B: BuildHasher>(build_hasher: &B) {
let word_pairs: Vec<_> = gen_word_pairs();
check_for_collisions(build_hasher, &word_pairs, 32);
}
#[allow(unused)] // False positive
fn check_for_collisions<H: Hash, B: BuildHasher>(build_hasher: &B, items: &[H], bucket_count: usize) {
let mut buckets = vec![0; bucket_count];
for item in items {
let value = hash(item, build_hasher) as usize;
buckets[value % bucket_count] += 1;
}
let mean = items.len() / bucket_count;
let max = *buckets.iter().max().unwrap();
let min = *buckets.iter().min().unwrap();
assert!(
(min as f64) > (mean as f64) * 0.95,
"min: {}, max:{}, {:?}",
min,
max,
buckets
);
assert!(
(max as f64) < (mean as f64) * 1.05,
"min: {}, max:{}, {:?}",
min,
max,
buckets
);
}
#[cfg(feature = "specialize")]
#[allow(unused)] // False positive
fn hash<H: Hash, B: BuildHasher>(b: &H, build_hasher: &B) -> u64 {
build_hasher.hash_one(b)
}
#[cfg(not(feature = "specialize"))]
#[allow(unused)] // False positive
fn hash<H: Hash, B: BuildHasher>(b: &H, build_hasher: &B) -> u64 {
let mut hasher = build_hasher.build_hasher();
b.hash(&mut hasher);
hasher.finish()
}
#[test]
fn test_bucket_distribution() {
let build_hasher = RandomState::with_seeds(1, 2, 3, 4);
test_hash_common_words(&build_hasher);
let sequence: Vec<_> = (0..320000).collect();
check_for_collisions(&build_hasher, &sequence, 32);
let sequence: Vec<_> = (0..2560000).collect();
check_for_collisions(&build_hasher, &sequence, 256);
let sequence: Vec<_> = (0..320000).map(|i| i * 1024).collect();
check_for_collisions(&build_hasher, &sequence, 32);
let sequence: Vec<_> = (0..2560000_u64).map(|i| i * 1024).collect();
check_for_collisions(&build_hasher, &sequence, 256);
}
#[cfg(feature = "std")]
#[test]
fn test_ahash_alias_map_construction() {
let mut map = ahash::HashMap::default();
map.insert(1, "test");
use ahash::HashMapExt;
let mut map = ahash::HashMap::with_capacity(1234);
map.insert(1, "test");
}
#[cfg(feature = "std")]
#[test]
fn test_ahash_alias_set_construction() {
let mut set = ahash::HashSet::default();
set.insert(1);
use ahash::HashSetExt;
let mut set = ahash::HashSet::with_capacity(1235);
set.insert(1);
}
#[cfg(feature = "std")]
#[test]
fn test_key_ref() {
let mut map = ahash::HashMap::default();
map.insert(1, "test");
assert_eq!(Some((1, "test")), map.remove_entry(&1));
let mut map = ahash::HashMap::default();
map.insert(&1, "test");
assert_eq!(Some((&1, "test")), map.remove_entry(&&1));
let mut m = ahash::HashSet::<Box<String>>::default();
m.insert(Box::from("hello".to_string()));
assert!(m.contains(&"hello".to_string()));
let mut m = ahash::HashSet::<String>::default();
m.insert("hello".to_string());
assert!(m.contains("hello"));
let mut m = ahash::HashSet::<Box<[u8]>>::default();
m.insert(Box::from(&b"hello"[..]));
assert!(m.contains(&b"hello"[..]));
}
#[cfg(feature = "std")]
#[test]
fn test_byte_dist() {
use rand::{SeedableRng, Rng, RngCore};
use pcg_mwc::Mwc256XXA64;
let mut r = Mwc256XXA64::seed_from_u64(0xe786_c22b_119c_1479);
let mut lowest = 2.541;
let mut highest = 2.541;
for _round in 0..100 {
let mut table: [bool; 256 * 8] = [false; 256 * 8];
let hasher = RandomState::with_seeds(r.gen(), r.gen(), r.gen(), r.gen());
for i in 0..128 {
let mut keys: [u8; 8] = hasher.hash_one((i as u64) << 30).to_ne_bytes();
//let mut keys = r.next_u64().to_ne_bytes(); //This is a control to test assert sensitivity.
for idx in 0..8 {
while table[idx * 256 + keys[idx] as usize] {
keys[idx] = keys[idx].wrapping_add(1);
}
table[idx * 256 + keys[idx] as usize] = true;
}
}
for idx in 0..8 {
let mut len = 0;
let mut total_len = 0;
let mut num_seq = 0;
for i in 0..256 {
if table[idx * 256 + i] {
len += 1;
} else if len != 0 {
num_seq += 1;
total_len += len;
len = 0;
}
}
let mean = total_len as f32 / num_seq as f32;
println!("Mean sequence length = {}", mean);
if mean > highest {
highest = mean;
}
if mean < lowest {
lowest = mean;
}
}
}
assert!(lowest > 1.9, "Lowest = {}", lowest);
assert!(highest < 3.9, "Highest = {}", highest);
}
fn ahash_vec<H: Hash>(b: &Vec<H>) -> u64 {
let mut total: u64 = 0;
for item in b {
let mut hasher = RandomState::with_seeds(12, 34, 56, 78).build_hasher();
item.hash(&mut hasher);
total = total.wrapping_add(hasher.finish());
}
total
}
fn fxhash_vec<H: Hash>(b: &Vec<H>) -> u64 {
let mut total: u64 = 0;
for item in b {
let mut hasher = FxHasher::default();
item.hash(&mut hasher);
total = total.wrapping_add(hasher.finish());
}
total
}
fn bench_ahash_words(c: &mut Criterion) {
let words = gen_word_pairs();
c.bench_function("aes_words", |b| b.iter(|| black_box(ahash_vec(&words))));
}
fn bench_fx_words(c: &mut Criterion) {
let words = gen_word_pairs();
c.bench_function("fx_words", |b| b.iter(|| black_box(fxhash_vec(&words))));
}
criterion_main!(benches);
criterion_group!(benches, bench_ahash_words, bench_fx_words,);

81
third-party/vendor/ahash/tests/nopanic.rs vendored Normal file
View file

@ -0,0 +1,81 @@
use ahash::{AHasher, RandomState};
use std::hash::{BuildHasher, Hash, Hasher};
#[macro_use]
extern crate no_panic;
#[inline(never)]
#[no_panic]
fn hash_test_final(num: i32, string: &str) -> (u64, u64) {
use core::hash::Hasher;
let mut hasher1 = RandomState::with_seeds(1, 2, 3, 4).build_hasher();
let mut hasher2 = RandomState::with_seeds(3, 4, 5, 6).build_hasher();
hasher1.write_i32(num);
hasher2.write(string.as_bytes());
(hasher1.finish(), hasher2.finish())
}
#[inline(never)]
fn hash_test_final_wrapper(num: i32, string: &str) {
hash_test_final(num, string);
}
struct SimpleBuildHasher {
hasher: AHasher,
}
impl SimpleBuildHasher {
fn hash_one<T: Hash>(&self, x: T) -> u64
where
Self: Sized,
{
let mut hasher = self.build_hasher();
x.hash(&mut hasher);
hasher.finish()
}
}
impl BuildHasher for SimpleBuildHasher {
type Hasher = AHasher;
fn build_hasher(&self) -> Self::Hasher {
self.hasher.clone()
}
}
#[inline(never)]
#[no_panic]
fn hash_test_specialize(num: i32, string: &str) -> (u64, u64) {
let hasher1 = RandomState::with_seeds(1, 2, 3, 4).build_hasher();
let hasher2 = RandomState::with_seeds(1, 2, 3, 4).build_hasher();
(
SimpleBuildHasher { hasher: hasher1 }.hash_one(num),
SimpleBuildHasher { hasher: hasher2 }.hash_one(string.as_bytes()),
)
}
#[inline(never)]
fn hash_test_random_wrapper(num: i32, string: &str) {
hash_test_specialize(num, string);
}
#[inline(never)]
#[no_panic]
fn hash_test_random(num: i32, string: &str) -> (u64, u64) {
let build_hasher1 = RandomState::with_seeds(1, 2, 3, 4);
let build_hasher2 = RandomState::with_seeds(1, 2, 3, 4);
(build_hasher1.hash_one(&num), build_hasher2.hash_one(string.as_bytes()))
}
#[inline(never)]
fn hash_test_specialize_wrapper(num: i32, string: &str) {
hash_test_specialize(num, string);
}
#[test]
fn test_no_panic() {
hash_test_final_wrapper(2, "Foo");
hash_test_specialize_wrapper(2, "Bar");
hash_test_random(2, "Baz");
hash_test_random_wrapper(2, "Bat");
}