Low bias 32 bit hash in C#

low_bias_hash.cs

public static uint DataHash(byte[] data, uint len)
{
    var hash = len;
    for (uint i = 0; i < len; i++)
    {
        hash += data[i];
        hash ^= hash >> 16;
        hash *= 0x7feb352d;
        hash ^= hash >> 15;
        hash *= 0x846ca68b;
        hash ^= hash >> 16;
    }

    hash ^= len;
    hash ^= hash >> 16;
    hash *= 0x7feb352d;
    hash ^= hash >> 15;
    hash *= 0x846ca68b;
    hash ^= hash >> 16;
    hash += len;

    // never return zero value
    return hash == 0 ? 0x800800 : hash;
}