static ulong ByteArrayGetHashCode(byte[] x, int offset, int count)
{
#if NETSTANDARD
// FarmHash https://github.com/google/farmhash
if (x == null || x.Length == 0 || count == 0)
{
return(0);
}
if (Is32Bit)
{
return((ulong)FarmHash.Hash32(x, offset, count));
}
else
{
return(FarmHash.Hash64(x, offset, count));
}
#else
// FNV1-1a 32bit https://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function
uint hash = 0;
if (x != null)
{
var max = offset + count;
hash = 2166136261;
for (int i = offset; i < max; i++)
{
hash = unchecked ((x[i] ^ hash) * 16777619);
}
}
return((ulong)hash);
#endif
}
public static int GetHashCode(byte[] bytes, int offset, int count)
{
if (Is32Bit)
{
return(unchecked ((int)FarmHash.Hash32(bytes, offset, count)));
}
else
{
return(unchecked ((int)FarmHash.Hash64(bytes, offset, count)));
}
}
