wisage的专栏

各种Hash函数和代码 常用的字符串Hash函数还有ELFHash，APHash等等，都是十分简单有效的方法。这些函数使用位运算使得每一个字符都对最后的函数值产生影响。另外还有以MD5和SHA1为代表的杂凑函数，这些函数几乎不可能找到碰撞。常用字符串哈希函数有BKDRHash，APHash，DJBHash，JSHash，RSHash，

/**//**    * Thomas Wang的算法，整数hash    */    public static int intHash(int key)    {        key += ~(key         key ^= (key >> 10);        key += (key         key ^= (key >> 6);     

An extremely memory-efficient hash_map implementation. 2 bits/entry overhead! The SparseHash library contains several hash-map implementations, including implementations that optimize for space or s

<br /><br />An extremely memory-efficient hash_map implementation. 2 bits/entry overhead! The SparseHash library contains several hash-map implementations, including implementations that optimize for space or speed.<br />These hashtable implementations are

<br /><br />zlib 是通用的压缩库，提供了一套 in-memory 压缩和解压函数，并能检测解压出来的数据的完整性(integrity)。zlib 也支持读写 gzip (.gz) 格式的文件。下面介绍两个最有用的函数——compress 和 uncompress。 <br />int compress(Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen);<br />compress函数将 source 缓冲区