public static FilterLoadPayload Create(BloomFilter filter)
{
byte[] buffer = new byte[filter.M / 8];
filter.GetBits(buffer);
return(new FilterLoadPayload
{
Filter = buffer,
K = (byte)filter.K,
Tweak = filter.Tweak
});
}
public void TestGetBits()
{
int m = 7, n = 10;
uint nTweak = 123456;
byte[] elements = { 0, 1, 2, 3, 4 };
BloomFilter filter = new BloomFilter(m, n, nTweak);
byte[] result = new byte[m];
filter.GetBits(result);
foreach (byte value in result)
{
value.Should().Be(0);
}
}
public void Add()
{
// Arrange
var bloomfilter = new BloomFilter(256, 2, 1);
byte[] element = { 0x01, 0x01, 0x01, 0x01 };
var result = new byte[32];
// Act
bloomfilter.Add(element);
bloomfilter.GetBits(result);
var K = bloomfilter.K;
var M = bloomfilter.M;
// Assert
Assert.AreEqual(0x08, result[8]);
Assert.AreEqual(2, K);
Assert.AreEqual(256, M);
}
public void GetBits()
{
// Arrange
var bloomfilter = new BloomFilter(32, 3, 2);
byte[] element1 = { 0x01, 0x02, 0x03, 0x04 };
byte[] element2 = { 0xDE, 0xAD, 0xBE, 0xEF };
byte[] element3 = { 0x22, 0x22, 0x22, 0x22 };
byte[] expect = { 0x0a, 0x04, 0x44, 0xca };
var result = new byte[4];
// Act
bloomfilter.Add(element1);
bloomfilter.Add(element2);
bloomfilter.Add(element3);
bloomfilter.GetBits(result);
// Assert
Assert.AreEqual(result.ToHexString(false), "0a0444ca");
}
