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- /*
- american fuzzy lop - hashing function
- -------------------------------------
- The hash32() function is a variant of MurmurHash3, a good
- non-cryptosafe hashing function developed by Austin Appleby.
- For simplicity, this variant does *NOT* accept buffer lengths
- that are not divisible by 8 bytes. The 32-bit version is otherwise
- similar to the original; the 64-bit one is a custom hack with
- mostly-unproven properties.
- Austin's original code is public domain.
- Other code written and maintained by Michal Zalewski <lcamtuf@google.com>
- Copyright 2016 Google Inc. All rights reserved.
- Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License.
- You may obtain a copy of the License at:
- http://www.apache.org/licenses/LICENSE-2.0
- */
- #ifndef _HAVE_HASH_H
- #define _HAVE_HASH_H
- #include "types.h"
- #ifdef __x86_64__
- #define ROL64(_x, _r) ((((u64)(_x)) << (_r)) | (((u64)(_x)) >> (64 - (_r))))
- static inline u32 hash32(const void* key, u32 len, u32 seed) {
- const u64* data = (u64*)key;
- u64 h1 = seed ^ len;
- len >>= 3;
- while (len--) {
- u64 k1 = *data++;
- k1 *= 0x87c37b91114253d5ULL;
- k1 = ROL64(k1, 31);
- k1 *= 0x4cf5ad432745937fULL;
- h1 ^= k1;
- h1 = ROL64(h1, 27);
- h1 = h1 * 5 + 0x52dce729;
- }
- h1 ^= h1 >> 33;
- h1 *= 0xff51afd7ed558ccdULL;
- h1 ^= h1 >> 33;
- h1 *= 0xc4ceb9fe1a85ec53ULL;
- h1 ^= h1 >> 33;
- return h1;
- }
- #else
- #define ROL32(_x, _r) ((((u32)(_x)) << (_r)) | (((u32)(_x)) >> (32 - (_r))))
- static inline u32 hash32(const void* key, u32 len, u32 seed) {
- const u32* data = (u32*)key;
- u32 h1 = seed ^ len;
- len >>= 2;
- while (len--) {
- u32 k1 = *data++;
- k1 *= 0xcc9e2d51;
- k1 = ROL32(k1, 15);
- k1 *= 0x1b873593;
- h1 ^= k1;
- h1 = ROL32(h1, 13);
- h1 = h1 * 5 + 0xe6546b64;
- }
- h1 ^= h1 >> 16;
- h1 *= 0x85ebca6b;
- h1 ^= h1 >> 13;
- h1 *= 0xc2b2ae35;
- h1 ^= h1 >> 16;
- return h1;
- }
- #endif /* ^__x86_64__ */
- #endif /* !_HAVE_HASH_H */
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