fnv1a.h

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#pragma once
 
#include <cstdint>
#include <cstddef>
#include <promeki/core/namespace.h>
 
PROMEKI_NAMESPACE_BEGIN
 
constexpr uint64_t fnv1a(const char *s, uint64_t seed = 0xcbf29ce484222325ULL) {
        return *s ? fnv1a(s + 1, (seed ^ static_cast<uint64_t>(*s)) * 0x100000001b3ULL) : seed;
}
 
constexpr uint64_t fnv1aData(const void *data, size_t len, uint64_t seed = 0xcbf29ce484222325ULL) {
        const auto *p = static_cast<const unsigned char *>(data);
        for (size_t i = 0; i < len; ++i) {
                seed = (seed ^ static_cast<uint64_t>(p[i])) * 0x100000001b3ULL;
        }
        return seed;
}
 
PROMEKI_NAMESPACE_END