murmurhash.h

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright 2016, Olivier MATZ <zer0@droids-corp.org>
 */

 
#pragma once
 
#include <stdint.h>

static inline uint32_t ec_murmurhash_rotl32(uint32_t x, int8_t r)
{
    return (x << r) | (x >> (32 - r));
}

static inline uint32_t ec_murmurhash3_add32(uint32_t h, uint32_t data)
{
    data *= 0xcc9e2d51;
    data = ec_murmurhash_rotl32(data, 15);
    data *= 0x1b873593;
    h ^= data;
    return h;
}

static inline uint32_t ec_murmurhash3_mix32(uint32_t h)
{
    h = ec_murmurhash_rotl32(h, 13);
    h = h * 5 + 0xe6546b64;
    return h;
}

static inline uint32_t ec_murmurhash3_fmix32(uint32_t h)
{
    h ^= h >> 16;
    h *= 0x85ebca6b;
    h ^= h >> 13;
    h *= 0xc2b2ae35;
    h ^= h >> 16;
 
    return h;
}

uint32_t ec_murmurhash3(const void *key, int len, uint32_t seed);