IpV6纯真IP库解析.txt

 /// <summary>
    /// IpV6纯真IP库（使用时请自行准备IP库，默认路径：/App_Data/ipv6wry.db）
    /// </summary>
    public class Ipdbv6
    {
        FileStream ipFile;
        long ip;
        string ipfilePath = HttpContext.Current != null ? HttpContext.Current.Server.MapPath($@"/App_Data/ipv6wry.db") : "";
        //偏移地址长度
        int ipOff;
        //IP地址长度
        int iplen;
        //记录数
        long indexCount;
        //索引第一条记录偏移
        long firstIndex;
        //读取数据库数据
        byte[] by;

        ///<summary>
        /// 构造函数
        ///</summary>
        public Ipdbv6()
        {

        }

        /// <summary>
        /// 根据IP获取位置
        /// </summary>

        /// <param name="ipAddr">ip地址</param>
        /// <param name="spacer">分隔符</param>
        /// <returns></returns>
        public string IpLocation(IPAddress ipAddr, string spacer = " ")
        {
            ipFile = new FileStream(ipfilePath, FileMode.Open, FileAccess.Read);

            by = new byte[ipFile.Length];

            ipFile.Read(by, 0, by.Length);

            ipFile.Close();
            ipFile = null;

            if (Encoding.UTF8.GetString(by, 0, 4) != "IPDB" || BitConverter.ToInt16(by, 4) > 1)//数据库格式错误
            {
                return "数据库格式错误";
            }


            ipOff = Convert.ToInt32(by[6]);

            iplen = by[7];
            indexCount = BitConverter.ToInt64(by, 8);
            firstIndex = BitConverter.ToInt64(by, 16);

            ip = GetIpLong4(ipAddr);

            IPLocationStruct loc = GetIPLocation();