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xxh64

XXH64 — a fast, portable, high-quality non-cryptographic hash. Faithful MoonBit port of the reference xxHash.

hash
xxhash
xxh64
non-cryptographic
hashmap
moon add tonyfettes/xxh64@0.1.0
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Version
0.1.0
License
BSD-2-Clause
Repository
Last updated
last month
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119
README

#xxh64

A fast, portable, high-quality non-cryptographic hash for MoonBit — a faithful port of XXH64 from the reference xxHash by Yann Collet. 64-bit output, little-endian, seedable.

#Why XXH64

XXH64 uses only 64×64 → low 64 multiplies (a single mul), so unlike rapidhash / wyhash / xxh3, it needs no "multiply-high" (umulh / __int128) primitive. That makes it map cleanly onto MoonBit's UInt64 with no portable-schoolbook emulation penalty, and it runs at the same speed on every backend (native / wasm / js). It passes SMHasher and is widely deployed.

#Install

moon add tonyfettes/xxh64

Then import it in your package's moon.pkg:

import { "tonyfettes/xxh64" }

#Usage

///|
test {
  // 64-bit hash of a byte buffer.
  let h = @xxh64.xxh64(b"abc")
  inspect(@xxh64.to_hex(h), content="44bc2cf5ad770999")

  // A seed perturbs the result deterministically.
  inspect(h == @xxh64.xxh64(b"abc", seed=1), content="false")
}

#API

fn xxh64(Bytes, seed? : UInt64) -> UInt64
fn to_hex(UInt64) -> String

Output is bit-for-bit identical to the reference C XXH64, validated against reference-generated known-answer vectors (see xxh64_test.mbt).

#License

BSD-2-Clause. Based on xxHash (Yann Collet), also BSD-2-Clause. See LICENSE.

#
to_hex

source
fn to_hex(hash : UInt64) -> String

xxh64 formatted as 16 lowercase hex chars.

inspect(@xxh64.to_hex(@xxh64.xxh64(b"abc")), content="44bc2cf5ad770999")

#
xxh64

source
fn xxh64(data : Bytes, seed? : UInt64) -> UInt64

XXH64 of data with an optional seed (default 0). 64-bit output.

inspect(@xxh64.to_hex(@xxh64.xxh64(b"abc")), content="44bc2cf5ad770999")

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