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53 lines
1.5 KiB
53 lines
1.5 KiB
7 months ago
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#pragma once
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#include <stdio.h>
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#include <stdint.h>
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#include <utility>
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#include <map>
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namespace fuzzing {
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namespace datasource {
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/* From: https://gist.github.com/underscorediscovery/81308642d0325fd386237cfa3b44785c */
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inline uint64_t hash_64_fnv1a(const void* key, const uint64_t len) {
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const char* data = (char*)key;
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uint64_t hash = 0xcbf29ce484222325;
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uint64_t prime = 0x100000001b3;
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for(uint64_t i = 0; i < len; ++i) {
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uint8_t value = data[i];
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hash = hash ^ value;
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hash *= prime;
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}
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return hash;
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} //hash_64_fnv1a
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// FNV1a c++11 constexpr compile time hash functions, 32 and 64 bit
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// str should be a null terminated string literal, value should be left out
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// e.g hash_32_fnv1a_const("example")
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// code license: public domain or equivalent
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// post: https://notes.underscorediscovery.com/constexpr-fnv1a/
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constexpr uint32_t val_32_const = 0x811c9dc5;
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constexpr uint32_t prime_32_const = 0x1000193;
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constexpr uint64_t val_64_const = 0xcbf29ce484222325;
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constexpr uint64_t prime_64_const = 0x100000001b3;
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inline constexpr uint64_t ID(const char* const str, const uint64_t value = val_64_const) noexcept {
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auto ret = (str[0] == '\0') ? value : ID(&str[1], (value ^ uint64_t(str[0])) * prime_64_const);
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return ret;
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}
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inline constexpr std::pair<const char*, uint64_t> IDPair(const char* const str, const uint64_t value = val_64_const) noexcept {
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return {str, ID(str, value)};
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}
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using IDMap = std::map<const char*, uint64_t>;
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} /* namespace datasource */
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} /* namespace fuzzing */
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