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using System;
public class XXHash
{
private uint seed;
private const uint PRIME32_1 = 2654435761U;
private const uint PRIME32_2 = 2246822519U;
private const uint PRIME32_3 = 3266489917U;
private const uint PRIME32_4 = 668265263U;
private const uint PRIME32_5 = 374761393U;
public XXHash(int seed)
{
this.seed = (uint)seed;
}
public uint GetHash(byte[] buf)
{
int i = 0;
int num = buf.Length;
uint num3;
if (num >= 16)
{
int num2 = num - 16;
uint value = this.seed + 2654435761U + 2246822519U;
uint value2 = this.seed + 2246822519U;
uint value3 = this.seed;
uint value4 = this.seed - 2654435761U;
do
{
value = XXHash.CalcSubHash(value, buf, i);
i += 4;
value2 = XXHash.CalcSubHash(value2, buf, i);
i += 4;
value3 = XXHash.CalcSubHash(value3, buf, i);
i += 4;
value4 = XXHash.CalcSubHash(value4, buf, i);
i += 4;
}
while (i <= num2);
num3 = XXHash.RotateLeft(value, 1) + XXHash.RotateLeft(value2, 7) + XXHash.RotateLeft(value3, 12) + XXHash.RotateLeft(value4, 18);
}
else
{
num3 = this.seed + 374761393U;
}
num3 += (uint)num;
while (i <= num - 4)
{
num3 += BitConverter.ToUInt32(buf, i) * 3266489917U;
num3 = XXHash.RotateLeft(num3, 17) * 668265263U;
i += 4;
}
while (i < num)
{
num3 += (uint)buf[i] * 374761393U;
num3 = XXHash.RotateLeft(num3, 11) * 2654435761U;
i++;
}
num3 ^= num3 >> 15;
num3 *= 2246822519U;
num3 ^= num3 >> 13;
num3 *= 3266489917U;
return num3 ^ num3 >> 16;
}
public uint GetHash(params uint[] buf)
{
int i = 0;
int num = buf.Length;
uint num3;
if (num >= 4)
{
int num2 = num - 4;
uint value = this.seed + 2654435761U + 2246822519U;
uint value2 = this.seed + 2246822519U;
uint value3 = this.seed;
uint value4 = this.seed - 2654435761U;
do
{
value = XXHash.CalcSubHash(value, buf[i]);
i++;
value2 = XXHash.CalcSubHash(value2, buf[i]);
i++;
value3 = XXHash.CalcSubHash(value3, buf[i]);
i++;
value4 = XXHash.CalcSubHash(value4, buf[i]);
i++;
}
while (i <= num2);
num3 = XXHash.RotateLeft(value, 1) + XXHash.RotateLeft(value2, 7) + XXHash.RotateLeft(value3, 12) + XXHash.RotateLeft(value4, 18);
}
else
{
num3 = this.seed + 374761393U;
}
num3 += (uint)(num * 4);
while (i < num)
{
num3 += buf[i] * 3266489917U;
num3 = XXHash.RotateLeft(num3, 17) * 668265263U;
i++;
}
num3 ^= num3 >> 15;
num3 *= 2246822519U;
num3 ^= num3 >> 13;
num3 *= 3266489917U;
return num3 ^ num3 >> 16;
}
public uint GetHash(params int[] buf)
{
int i = 0;
int num = buf.Length;
uint num3;
if (num >= 4)
{
int num2 = num - 4;
uint value = this.seed + 2654435761U + 2246822519U;
uint value2 = this.seed + 2246822519U;
uint value3 = this.seed;
uint value4 = this.seed - 2654435761U;
do
{
value = XXHash.CalcSubHash(value, (uint)buf[i]);
i++;
value2 = XXHash.CalcSubHash(value2, (uint)buf[i]);
i++;
value3 = XXHash.CalcSubHash(value3, (uint)buf[i]);
i++;
value4 = XXHash.CalcSubHash(value4, (uint)buf[i]);
i++;
}
while (i <= num2);
num3 = XXHash.RotateLeft(value, 1) + XXHash.RotateLeft(value2, 7) + XXHash.RotateLeft(value3, 12) + XXHash.RotateLeft(value4, 18);
}
else
{
num3 = this.seed + 374761393U;
}
num3 += (uint)(num * 4);
while (i < num)
{
num3 += (uint)(buf[i] * -1028477379);
num3 = XXHash.RotateLeft(num3, 17) * 668265263U;
i++;
}
num3 ^= num3 >> 15;
num3 *= 2246822519U;
num3 ^= num3 >> 13;
num3 *= 3266489917U;
return num3 ^ num3 >> 16;
}
public uint GetHash(int buf)
{
uint num = XXHash.RotateLeft(this.seed + 374761393U + 4U + (uint)(buf * -1028477379), 17) * 668265263U;
uint num2 = (num ^ num >> 15) * 2246822519U;
uint num3 = (num2 ^ num2 >> 13) * 3266489917U;
return num3 ^ num3 >> 16;
}
private static uint CalcSubHash(uint value, byte[] buf, int index)
{
uint num = BitConverter.ToUInt32(buf, index);
value += num * 2246822519U;
value = XXHash.RotateLeft(value, 13);
value *= 2654435761U;
return value;
}
private static uint CalcSubHash(uint value, uint read_value)
{
value += read_value * 2246822519U;
value = XXHash.RotateLeft(value, 13);
value *= 2654435761U;
return value;
}
private static uint RotateLeft(uint value, int count)
{
return value << count | value >> 32 - count;
}
}
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