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blizzard_hash_for_android

降低暴雪哈希的内存消耗(理论上牺牲碰撞率),千万量级别以内的数据,碰撞率和内存消耗都优与bloom filter

node 结点存放两个属性:

1)nHashA, nHashA取byte的前7位(1~127),用以存储HashString返回值(long类型)的低7位。该值用来处理第一次碰撞的哈希值

2)bExists,bExists取byte的最后1位。用以标记某哈希地址是否已被占用

测试效果: 2000000条数据,table_lenght=pow(2,21)(2097152),占用内存大小为pow(2,21)*8(16M)=======》碰撞次数为0

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