39 lines
1.9 KiB
C
39 lines
1.9 KiB
C
// NOTE: [$FNV1] Dqn_FNV1A =========================================================================
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// NOTE: API =======================================================================================
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#if 0
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char buffer1[128] = {random bytes};
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char buffer2[128] = {random bytes};
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uint64_t hash = Dqn_FNV1A64_Hash(buffer1, sizeof(buffer1));
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hash = Dqn_FNV1A64_Iterate(buffer2, sizeof(buffer2), hash); // subsequent hashing
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#endif
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#if !defined(DQN_FNV1A32_SEED)
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#define DQN_FNV1A32_SEED 2166136261U
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#endif
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#if !defined(DQN_FNV1A64_SEED)
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#define DQN_FNV1A64_SEED 14695981039346656037ULL
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#endif
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DQN_API uint32_t Dqn_FNV1A32_Hash (void const *bytes, Dqn_usize size);
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DQN_API uint64_t Dqn_FNV1A64_Hash (void const *bytes, Dqn_usize size);
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DQN_API uint32_t Dqn_FNV1A32_Iterate(void const *bytes, Dqn_usize size, uint32_t hash);
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DQN_API uint64_t Dqn_FNV1A64_Iterate(void const *bytes, Dqn_usize size, uint64_t hash);
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// NOTE: [$MMUR] Dqn_MurmurHash3 ===================================================================
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// MurmurHash3 was written by Austin Appleby, and is placed in the public
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// domain. The author (Austin Appleby) hereby disclaims copyright to this source
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// code.
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//
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// Note - The x86 and x64 versions do _not_ produce the same results, as the
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// algorithms are optimized for their respective platforms. You can still
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// compile and run any of them on any platform, but your performance with the
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// non-native version will be less than optimal.
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struct Dqn_MurmurHash3 { uint64_t e[2]; };
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DQN_API uint32_t Dqn_MurmurHash3_x86U32 (void const *key, int len, uint32_t seed);
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DQN_API Dqn_MurmurHash3 Dqn_MurmurHash3_x64U128(void const *key, int len, uint32_t seed);
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#define Dqn_MurmurHash3_x64U128AsU64(key, len, seed) (Dqn_MurmurHash3_x64U128(key, len, seed).e[0])
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#define Dqn_MurmurHash3_x64U128AsU32(key, len, seed) (DQN_CAST(uint32_t)Dqn_MurmurHash3_x64U128(key, len, seed).e[0])
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