public static MurmurHash ComputePrefixHash(string value, byte[] buffer = null)
{
var max = Encoding.UTF8.GetMaxByteCount(value.Length);
if (buffer == null || buffer.Length < max)
{
buffer = new byte[max];
}
int byteLength = Encoding.UTF8.GetBytes(value, 0, value.Length, buffer, 0);
var hasher = new Murmur3();
int remaining = byteLength;
uint int0, int1, int2, int3;
int start = 0;
int length = Math.Min(4, remaining);
var hash = hasher.ComputeHash(buffer, start, length);
int0 = hash.GetInt(0);
start += length;
remaining -= length;
length <<= 1;
length = Math.Min(length, remaining);
if (length > 0)
{
hash = hasher.ComputeHash(buffer, start, length);
}
int1 = hash.GetInt(1);
remaining -= length;
start += length;
length <<= 1;
length = Math.Min(length, remaining);
if (length > 0)
{
hash = hasher.ComputeHash(buffer, start, length);
}
int2 = hash.GetInt(2);
remaining -= length;
start += length;
if (remaining > 0)
{
hash = hasher.ComputeHash(buffer, start, remaining);
}
int3 = hash.GetInt(3);
return(new MurmurHash(int0, int1, int2, int3));
}
public static MurmurHash ComputeFullHash(string value, byte[] buffer = null)
{
var max = Encoding.UTF8.GetMaxByteCount(value.Length);
if (buffer == null || buffer.Length < max)
{
buffer = new byte[max];
}
int byteLength = Encoding.UTF8.GetBytes(value, 0, value.Length, buffer, 0);
var hasher = new Murmur3();
return(hasher.ComputeHash(buffer));
}
