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using System;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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namespace ZeroLevel.Services.HashFunctions
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{
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public static class Murmur3
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{
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// 128 bit output, 64 bit platform version
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public static ulong READ_SIZE = 16;
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private static ulong C1 = 0x87c37b91114253d5L;
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private static ulong C2 = 0x4cf5ad432745937fL;
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static ulong MixKey1(ulong k1)
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{
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k1 *= C1;
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k1 = k1.RotateLeft(31);
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k1 *= C2;
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return k1;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static ulong MixKey2(ulong k2)
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{
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k2 *= C2;
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k2 = k2.RotateLeft(33);
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k2 *= C1;
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return k2;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static ulong MixFinal(ulong k)
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{
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// avalanche bits
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k ^= k >> 33;
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k *= 0xff51afd7ed558ccdL;
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k ^= k >> 33;
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k *= 0xc4ceb9fe1a85ec53L;
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k ^= k >> 33;
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return k;
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}
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public static byte[] ComputeHash(byte[] bb, ulong seed = 0)
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{
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var h1 = seed;
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ulong h2 = 0;
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var length = 0UL;
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int pos = 0;
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ulong remaining = (ulong)bb.Length;
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// read 128 bits, 16 bytes, 2 longs in eacy cycle
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while (remaining >= READ_SIZE)
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{
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ulong k1 = bb.GetUInt64(pos);
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pos += 8;
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ulong k2 = bb.GetUInt64(pos);
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pos += 8;
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length += READ_SIZE;
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remaining -= READ_SIZE;
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h1 ^= MixKey1(k1);
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h1 = h1.RotateLeft(27);
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h1 += h2;
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h1 = h1 * 5 + 0x52dce729;
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h2 ^= MixKey2(k2);
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h2 = h2.RotateLeft(31);
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h2 += h1;
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h2 = h2 * 5 + 0x38495ab5;
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}
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// if the input MOD 16 != 0
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if (remaining > 0)
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{
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ulong k1 = 0;
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ulong k2 = 0;
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length += remaining;
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// little endian (x86) processing
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switch (remaining)
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{
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case 15:
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k2 ^= (ulong)bb[pos + 14] << 48; // fall through
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goto case 14;
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case 14:
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k2 ^= (ulong)bb[pos + 13] << 40; // fall through
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goto case 13;
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case 13:
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k2 ^= (ulong)bb[pos + 12] << 32; // fall through
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goto case 12;
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case 12:
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k2 ^= (ulong)bb[pos + 11] << 24; // fall through
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goto case 11;
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case 11:
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k2 ^= (ulong)bb[pos + 10] << 16; // fall through
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goto case 10;
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case 10:
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k2 ^= (ulong)bb[pos + 9] << 8; // fall through
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goto case 9;
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case 9:
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k2 ^= (ulong)bb[pos + 8]; // fall through
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goto case 8;
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case 8:
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k1 ^= bb.GetUInt64(pos);
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break;
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case 7:
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k1 ^= (ulong)bb[pos + 6] << 48; // fall through
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goto case 6;
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case 6:
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k1 ^= (ulong)bb[pos + 5] << 40; // fall through
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goto case 5;
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case 5:
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k1 ^= (ulong)bb[pos + 4] << 32; // fall through
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goto case 4;
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case 4:
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k1 ^= (ulong)bb[pos + 3] << 24; // fall through
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goto case 3;
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case 3:
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k1 ^= (ulong)bb[pos + 2] << 16; // fall through
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goto case 2;
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case 2:
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k1 ^= (ulong)bb[pos + 1] << 8; // fall through
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goto case 1;
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case 1:
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k1 ^= (ulong)bb[pos]; // fall through
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break;
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default:
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throw new Exception("Something went wrong with remaining bytes calculation.");
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}
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h1 ^= MixKey1(k1);
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h2 ^= MixKey2(k2);
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}
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h1 ^= length;
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h2 ^= length;
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h1 += h2;
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h2 += h1;
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h1 = Murmur3.MixFinal(h1);
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h2 = Murmur3.MixFinal(h2);
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h1 += h2;
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h2 += h1;
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var hash = new byte[Murmur3.READ_SIZE];
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Array.Copy(BitConverter.GetBytes(h1), 0, hash, 0, 8);
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Array.Copy(BitConverter.GetBytes(h2), 0, hash, 8, 8);
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return hash;
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}
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public static ulong ComputeULongHash(byte[] bb, ulong seed = 0)
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{
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var h1 = seed;
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ulong h2 = 0;
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var length = 0UL;
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int pos = 0;
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ulong remaining = (ulong)bb.Length;
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// read 128 bits, 16 bytes, 2 longs in eacy cycle
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while (remaining >= READ_SIZE)
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{
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ulong k1 = bb.GetUInt64(pos);
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pos += 8;
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ulong k2 = bb.GetUInt64(pos);
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pos += 8;
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length += READ_SIZE;
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remaining -= READ_SIZE;
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h1 ^= MixKey1(k1);
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h1 = h1.RotateLeft(27);
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h1 += h2;
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h1 = h1 * 5 + 0x52dce729;
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h2 ^= MixKey2(k2);
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h2 = h2.RotateLeft(31);
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h2 += h1;
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h2 = h2 * 5 + 0x38495ab5;
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}
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// if the input MOD 16 != 0
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if (remaining > 0)
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{
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ulong k1 = 0;
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ulong k2 = 0;
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length += remaining;
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// little endian (x86) processing
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switch (remaining)
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{
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case 15:
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k2 ^= (ulong)bb[pos + 14] << 48; // fall through
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goto case 14;
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case 14:
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k2 ^= (ulong)bb[pos + 13] << 40; // fall through
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goto case 13;
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case 13:
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k2 ^= (ulong)bb[pos + 12] << 32; // fall through
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goto case 12;
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case 12:
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k2 ^= (ulong)bb[pos + 11] << 24; // fall through
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goto case 11;
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case 11:
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k2 ^= (ulong)bb[pos + 10] << 16; // fall through
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goto case 10;
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case 10:
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k2 ^= (ulong)bb[pos + 9] << 8; // fall through
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goto case 9;
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case 9:
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k2 ^= (ulong)bb[pos + 8]; // fall through
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goto case 8;
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case 8:
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k1 ^= bb.GetUInt64(pos);
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break;
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case 7:
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k1 ^= (ulong)bb[pos + 6] << 48; // fall through
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goto case 6;
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case 6:
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k1 ^= (ulong)bb[pos + 5] << 40; // fall through
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goto case 5;
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case 5:
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k1 ^= (ulong)bb[pos + 4] << 32; // fall through
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goto case 4;
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case 4:
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k1 ^= (ulong)bb[pos + 3] << 24; // fall through
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goto case 3;
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case 3:
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k1 ^= (ulong)bb[pos + 2] << 16; // fall through
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goto case 2;
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case 2:
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k1 ^= (ulong)bb[pos + 1] << 8; // fall through
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goto case 1;
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case 1:
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k1 ^= (ulong)bb[pos]; // fall through
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break;
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default:
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throw new Exception("Something went wrong with remaining bytes calculation.");
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}
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h1 ^= MixKey1(k1);
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h2 ^= MixKey2(k2);
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}
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h1 ^= length;
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h2 ^= length;
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h1 += h2;
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h2 += h1;
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h1 = Murmur3.MixFinal(h1);
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h2 = Murmur3.MixFinal(h2);
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h1 += h2;
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h2 += h1;
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return h2;
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}
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/// <summary>
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/// Hashes the <paramref name="bytes"/> into a MurmurHash3 as a <see cref="uint"/>.
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/// </summary>
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/// <param name="bytes">The span.</param>
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/// <param name="seed">The seed for this algorithm.</param>
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/// <returns>The MurmurHash3 as a <see cref="uint"/></returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static uint ComputeUIntHash(ref ReadOnlySpan<byte> bytes, uint seed)
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{
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ref byte bp = ref MemoryMarshal.GetReference(bytes);
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ref uint endPoint = ref Unsafe.Add(ref Unsafe.As<byte, uint>(ref bp), bytes.Length >> 2);
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if (bytes.Length >= 4)
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{
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do
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{
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seed = RotateLeft(seed ^ RotateLeft(Unsafe.ReadUnaligned<uint>(ref bp) * 3432918353U, 15) * 461845907U, 13) * 5 - 430675100;
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bp = ref Unsafe.Add(ref bp, 4);
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} while (Unsafe.IsAddressLessThan(ref Unsafe.As<byte, uint>(ref bp), ref endPoint));
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}
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var remainder = bytes.Length & 3;
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if (remainder > 0)
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{
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uint num = 0;
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if (remainder > 2) num ^= Unsafe.Add(ref endPoint, 2) << 16;
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if (remainder > 1) num ^= Unsafe.Add(ref endPoint, 1) << 8;
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num ^= endPoint;
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seed ^= RotateLeft(num * 3432918353U, 15) * 461845907U;
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}
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seed ^= (uint)bytes.Length;
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seed = (uint)((seed ^ (seed >> 16)) * -2048144789);
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seed = (uint)((seed ^ (seed >> 13)) * -1028477387);
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return seed ^ seed >> 16;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static ulong RotateLeft(this ulong original, int bits) => (original << bits) | (original >> (64 - bits));
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static uint RotateLeft(this uint original, int bits) => (original << bits) | (original >> (32 - bits));
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static ulong RotateRight(this ulong original, int bits) =>
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(original >> bits) | (original << (64 - bits));
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static ulong GetUInt64(this byte[] bb, int pos) =>
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(ulong)(bb[pos++] | bb[pos++] << 8 | bb[pos++] << 16 | bb[pos++] << 24);
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}
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}
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