public static void HandleClientHello(LobbySession session, ClientHello hello)
{
session.CalculateNetworkKey(hello.Time, hello.Seed);
session.SessionHash = XxHash.CalculateHash(Guid.NewGuid().ToByteArray());
session.Send(new ServerHello
{
SessionHash = session.SessionHash
});
}
public uint Hash(uint generator, int index)
{
return(XxHash.GetHash(new[] { index }, generator));
}
public uint Hash(uint generator, int index)
{
return(XxHash.GetHash(index, generator));
}
public unsafe void CRCBenchmark()
{
var lens = new int[] { 1, 2, 3, 4, 7, 8, 9, 15, 16, 31, 32, 63, 64, 255, 256, 511, 512, 1023, 1024 };
foreach (var len in lens)
{
var arr = new byte[len];
var memory = (Memory <byte>)arr;
var handle = memory.Pin();
var ptr = (byte *)handle.Pointer;
var rng = new Random(42);
rng.NextBytes(arr);
var count = 1_00_000_000;
var cnt = count / len;
var sum = 0UL;
{
uint digest = 0;
using (Benchmark.Run("xxHash", count, true))
{
for (int i = 0; i < cnt; i++)
{
digest = XxHash.CalculateHash(ptr, len, digest);
}
}
}
uint crc0, crc1, crc2;
{
uint digest = 0;
using (Benchmark.Run("CRC32 Intrinsic", count, true))
{
for (int i = 0; i < cnt; i++)
{
digest = Crc32C.CalculateCrc32C(ptr, len, digest);
}
}
crc0 = digest;
}
{
uint digest = 0;
using (Benchmark.Run("CRC32 Managed", count, true))
{
for (int i = 0; i < cnt; i++)
{
digest = Crc32C.CalculateCrc32CManaged(ptr, len, digest);
}
}
crc1 = digest;
}
{
var crc32C = new Ralph.Crc32C.Crc32C();
uint digest = 0;
using (Benchmark.Run("CRC32 Ralph", count, true))
{
for (int i = 0; i < cnt; i++)
{
crc32C.Update(arr, 0, arr.Length);
digest = crc32C.GetIntValue();
}
}
crc2 = digest;
}
Assert.AreEqual(crc0, crc1);
Assert.AreEqual(crc0, crc2);
Benchmark.Dump("LEN: " + len);
}
}
public Random Create(int seed)
{
return(new Random((int)XxHash.GetHash(seed, 0u)));
}
