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namespace codedweller { |
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namespace codedweller { |
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const uint32_t primes[256] { |
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1019, 1021, 1031, 1033, 1039, 1049, 1051, 1061, |
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1063, 1069, 1087, 1091, 1093, 1097, 1103, 1109, |
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1117, 1123, 1129, 1151, 1153, 1163, 1171, 1181, |
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1187, 1193, 1201, 1213, 1217, 1223, 1229, 1231, |
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1237, 1249, 1259, 1277, 1279, 1283, 1289, 1291, |
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1297, 1301, 1303, 1307, 1319, 1321, 1327, 1361, |
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1367, 1373, 1381, 1399, 1409, 1423, 1427, 1429, |
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1433, 1439, 1447, 1451, 1453, 1459, 1471, 1481, |
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1483, 1487, 1489, 1493, 1499, 1511, 1523, 1531, |
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1543, 1549, 1553, 1559, 1567, 1571, 1579, 1583, |
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1597, 1601, 1607, 1609, 1613, 1619, 1621, 1627, |
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1637, 1657, 1663, 1667, 1669, 1693, 1697, 1699, |
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1709, 1721, 1723, 1733, 1741, 1747, 1753, 1759, |
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1777, 1783, 1787, 1789, 1801, 1811, 1823, 1831, |
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1847, 1861, 1867, 1871, 1873, 1877, 1879, 1889, |
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1901, 1907, 1913, 1931, 1933, 1949, 1951, 1973, |
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1979, 1987, 1993, 1997, 1999, 2003, 2011, 2017, |
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2027, 2029, 2039, 2053, 2063, 2069, 2081, 2083, |
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2087, 2089, 2099, 2111, 2113, 2129, 2131, 2137, |
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2141, 2143, 2153, 2161, 2179, 2203, 2207, 2213, |
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2221, 2237, 2239, 2243, 2251, 2267, 2269, 2273, |
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2281, 2287, 2293, 2297, 2309, 2311, 2333, 2339, |
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2341, 2347, 2351, 2357, 2371, 2377, 2381, 2383, |
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2389, 2393, 2399, 2411, 2417, 2423, 2437, 2441, |
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2447, 2459, 2467, 2473, 2477, 2503, 2521, 2531, |
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2539, 2543, 2549, 2551, 2557, 2579, 2591, 2593, |
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2609, 2617, 2621, 2633, 2647, 2657, 2659, 2663, |
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2671, 2677, 2683, 2687, 2689, 2693, 2699, 2707, |
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2711, 2713, 2719, 2729, 2731, 2741, 2749, 2753, |
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2767, 2777, 2789, 2791, 2797, 2801, 2803, 2819, |
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2833, 2837, 2843, 2851, 2857, 2861, 2879, 2887, |
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2897, 2903, 2909, 2917, 2927, 2939, 2953, 2957 |
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}; |
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inline size_t selectedPrime(size_t n) noexcept { return primes[n &0xff]; } |
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uint64_t mishmash(const unsigned char* buffer, size_t length, uint64_t accumulator) noexcept { |
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uint64_t masher::engine( |
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const unsigned char* buffer, size_t length, |
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uint64_t accumulator, |
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const masher::PrimeSet& primes) noexcept { |
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for(size_t index = 0; index < length; index++) { |
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for(size_t index = 0; index < length; index++) { |
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unsigned char byte = buffer[index]; |
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unsigned char byte = buffer[index]; |
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accumulator += selectedPrime(byte + accumulator); |
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accumulator *= selectedPrime(accumulator); |
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accumulator += primes.select(byte + accumulator); |
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accumulator *= primes.select(accumulator); |
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accumulator += accumulator >> 32; |
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accumulator += accumulator >> 32; |
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accumulator &= 0x000fffffffffffff; |
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accumulator &= 0x000fffffffffffff; |
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} |
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} |
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} |
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} |
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uint32_t mishmash(const unsigned char* buffer, size_t length) noexcept { |
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uint32_t mishmash(const unsigned char* buffer, size_t length) noexcept { |
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uint64_t accumulator = mishmash(buffer, length, 0); |
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uint64_t accumulator = masher::engine(buffer, length); |
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return static_cast<uint32_t>(accumulator & 0x00000000ffffffff); |
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return static_cast<uint32_t>(accumulator & 0x00000000ffffffff); |
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} |
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} |
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return mishmash(v.data(), v.size()); |
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return mishmash(v.data(), v.size()); |
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} |
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} |
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} |
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} // end of namespace codedweller |