unsigned long BloomFilter::hash2(const Key& key) {
unsigned long hash = 0;
for (unsigned i = 0; i < key.length(); i++) {
hash = key.c_str()[i] + (hash << 6) + (hash << 16) - hash;
}
long double d_hash = (long double)hash;
d_hash *= (0.5 * (sqrtl(5) - 1));
d_hash = d_hash / 10.0 - floorl(d_hash / 10.0);
d_hash *= (double)m_length;
return (unsigned long)floorl(d_hash);
}
unsigned long BloomFilter::hash1(const Key& key) {
unsigned long hash = 5381;
for (unsigned i = 0; i < key.length(); i++) {
hash = ((hash << 5) + hash) + key.c_str()[i]; // hash * 33 + c
}
double d_hash = (double)hash;
d_hash *= (0.5 * (sqrt(5) - 1));
d_hash -= floor(d_hash);
d_hash *= (double)m_length;
return (unsigned long)floor(d_hash);
}
unsigned long BloomFilter::hash2(const Key& key) {
unsigned long hash = 0;
unsigned int i=0;
for (i=0; i< key.length(); i++) {
hash = key.c_str()[i] + (hash << 6) + (hash << 16) - hash;
}
double d_hash = (double) hash;
d_hash *= (0.5*(sqrt(5)-1));
d_hash -= floor(d_hash);
d_hash *= (double)m_length;
return (unsigned long)floor(d_hash);
}
Value::Value(const Key & key) :
Value()
{
impl = new (clone_storage()) BSON::Type (Types::Utf8(key.c_str()));
}
inline int bind_key(sqlite3_stmt* stmt, const Key& key){
return sqlite3_bind_int64(stmt, 1, MurmurHash64A(key.c_str(), (int) key.length()));
//return sqlite3_bind_text(stmt, 1, key.c_str(), (int) key.length(), SQLITE_STATIC);
}
