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| 2 |
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| 3 | #ifndef _SELINUX_HASH_H_
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| 4 | #define _SELINUX_HASH_H_
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| 5 |
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| 6 | |
| 7 | * Based on MurmurHash3, written by Austin Appleby and placed in the
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| 8 | * public domain.
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| 9 |
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| 10 | static inline u32 av_hash(u32 key1, u32 key2, u32 key3, u32 mask)
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| 11 | {
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| 12 | static const u32 c1 = 0xcc9e2d51;
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| 13 | static const u32 c2 = 0x1b873593;
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| 14 | static const u32 r1 = 15;
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| 15 | static const u32 r2 = 13;
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| 16 | static const u32 m = 5;
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| 17 | static const u32 n = 0xe6546b64;
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| 18 |
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| 19 | u32 hash = 0;
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| 20 |
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| 21 | #define mix(input) \
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| 22 | do { \
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| 23 | u32 v = input; \
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| 24 | v *= c1; \
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| 25 | v = (v << r1) | (v >> (32 - r1)); \
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| 26 | v *= c2; \
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| 27 | hash ^= v; \
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| 28 | hash = (hash << r2) | (hash >> (32 - r2)); \
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| 29 | hash = hash * m + n; \
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| 30 | } while (0)
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| 31 |
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| 32 | mix(key1);
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| 33 | mix(key2);
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| 34 | mix(key3);
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| 35 |
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| 36 | #undef mix
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| 37 |
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| 38 | hash ^= hash >> 16;
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| 39 | hash *= 0x85ebca6b;
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| 40 | hash ^= hash >> 13;
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| 41 | hash *= 0xc2b2ae35;
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| 42 | hash ^= hash >> 16;
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| 43 |
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| 44 | return hash & mask;
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| 45 | }
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| 46 |
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| 47 | #endif
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