std/hash.zc

Rama main · réplica de lectura del repositorio original.

let __zen_hash_seed: usize = 14695981039346656037;
def _HASH_MAGIC: usize = 1099511628211;

// Combine two hash values.
@inline
fn hash_combine(a: usize, b: usize) -> usize {
    a = a ^ b;
    a = a * _HASH_MAGIC;
    return a;
}

// Compute the hash of the given pointer
// Pure Zen-C generic hash using FNV-1a algorithm
fn hash_compute(data: const void*, len: usize) -> usize {
    let hash = __zen_hash_seed;
    let bytes: u8* = (u8*)data;
    
    for (let i: usize = 0; i < len; i = i + 1) {
        hash = hash_combine(hash, (usize)bytes[i]);
    }
    
    return hash;
}

// Set a new seed for hashing algorithms
// Example: hash_set_seed((usize)Time::now())
fn hash_set_seed(seed: usize) {
    __zen_hash_seed = seed;
}

// Get the seed for hashing algorithms
@inline
fn hash_get_seed() -> usize {
    return __zen_hash_seed;
}