#include <stdint.h>
#include <stdio.h>

uint32_t murmur3_32(const uint8_t* key, size_t len, uint32_t seed) {
    uint32_t h = seed;
    uint32_t c1 = 0xcc9e2d51;
    uint32_t c2 = 0x1b873593;
    uint32_t k;
    size_t i;

    for (i = 0; i + 4 <= len; i += 4) {
        k = *(uint32_t*)(key + i);
        k *= c1;
        k = (k << 15) | (k >> (32 - 15));
        k *= c2;

        h ^= k;
        h = (h << 13) | (h >> (32 - 13));
        h = h * 5 + 0xe6546b64;
    }

    // Tail handling
    k = 0;
    switch (len & 3) {
        case 3: k ^= key[i + 2] << 16;
        case 2: k ^= key[i + 1] << 8;
        case 1: k ^= key[i + 0];
                k *= c1; k = (k << 15) | (k >> (32 - 15)); k *= c2; h ^= k;
    }

    h ^= len;
    h ^= h >> 16;
    h *= 0x85ebca6b;
    h ^= h >> 13;
    h *= 0xc2b2ae35;
    h ^= h >> 16;

    return h;
}

int main() {
    const char *key = "hello world";
    uint32_t hash = murmur3_32((const uint8_t *)key, 11, 42); // seed = 42
    printf("MurmurHash3 of \"%s\" is 0x%X\n", key, hash);
    return 0;
}