asp.net/C#读取纯真IP数据库
C#读取纯真IP数据库
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using System;using System.Collections.Generic;using System.Text;using System.IO;namespace 纯真IP数据库研究{ ///<summary> /// 提供从纯真IP数据库搜索IP信息的方法； /// 感谢LumaQQ提供纯真IP数据库格式文档； ///</summary> public classIPSearch { FileStream ipFile; long ip; string ipfilePath; ///<summary> /// 构造函数 ///</summary> ///<param name="ipfilePath">纯真IP数据库路径</param> public IPSearch(string ipfilePath) { this.ipfilePath = ipfilePath; } //测试 staticvoid Main(string[] args) { string ipfilePath = @"C:/Documents and Settings/Daode/桌面/qqwry/QQWry.dat"; IPSearch ipSearch = new IPSearch(ipfilePath); string ip = "72.51.27.51"; IPSearch.IPLocation loc = ipSearch.GetIPLocation(ip); Console.WriteLine("你查的ip是：{0} 地理位置：{1} {2}", ip, loc.country, loc.area); Console.ReadKey(); } ///<summary> /// 地理位置,包括国家和地区 ///</summary> public structIPLocation { public string country, area; } ///<summary> /// 获取指定IP所在地理位置 ///</summary> ///<param name="strIP">要查询的IP地址</param> ///<returns></returns> publicIPLocation GetIPLocation(string strIP) { ip = IPToLong(strIP); ipFile = new FileStream(ipfilePath, FileMode.Open, FileAccess.Read); long[] ipArray = BlockToArray(ReadIPBlock()); long offset = SearchIP(ipArray, 0, ipArray.Length - 1) * 7 + 4; ipFile.Position += offset;//跳过起始IP ipFile.Position = ReadLongX(3) + 4;//跳过结束IP IPLocation loc = new IPLocation(); int flag = ipFile.ReadByte();//读取标志 if (flag == 1)//表示国家和地区被转向 { ipFile.Position = ReadLongX(3); flag = ipFile.ReadByte();//再读标志 } long countryOffset = ipFile.Position; loc.country = ReadString(flag); if (flag == 2) { ipFile.Position = countryOffset + 3; } flag = ipFile.ReadByte(); loc.area = ReadString(flag); ipFile.Close(); ipFile = null; return loc; } ///<summary> /// 将字符串形式的IP转换位long ///</summary> ///<param name="strIP"></param> ///<returns></returns> publiclong IPToLong(string strIP) { byte[] ip_bytes = new byte[8]; string[] strArr = strIP.Split(new char[] { '.' }); for (int i = 0; i < 4; i++) { ip_bytes[i] = byte.Parse(strArr[3 - i]); } return BitConverter.ToInt64(ip_bytes, 0); } ///<summary> /// 将索引区字节块中的起始IP转换成Long数组 ///</summary> ///<param name="ipBlock"></param> long[] BlockToArray(byte[] ipBlock) { long[] ipArray = new long[ipBlock.Length / 7]; int ipIndex = 0; byte[] temp = new byte[8]; for (int i = 0; i < ipBlock.Length; i += 7) { Array.Copy(ipBlock, i, temp, 0, 4); ipArray[ipIndex] = BitConverter.ToInt64(temp, 0); ipIndex++; } return ipArray; } ///<summary> /// 从IP数组中搜索指定IP并返回其索引 ///</summary> ///<param name="ipArray">IP数组</param> ///<param name="start">指定搜索的起始位置</param> ///<param name="end">指定搜索的结束位置</param> ///<returns></returns> int SearchIP(long[] ipArray,int start, int end) { int middle = (start + end) / 2; if (middle == start) return middle; else if (ip < ipArray[middle]) return SearchIP(ipArray, start, middle); else return SearchIP(ipArray, middle, end); } ///<summary> /// 读取IP文件中索引区块 ///</summary> ///<returns></returns> byte[] ReadIPBlock() { long startPosition = ReadLongX(4); long endPosition = ReadLongX(4); long count = (endPosition - startPosition) / 7 + 1;//总记录数 ipFile.Position = startPosition; byte[] ipBlock = new byte[count * 7]; ipFile.Read(ipBlock, 0, ipBlock.Length); ipFile.Position = startPosition; return ipBlock; } ///<summary> /// 从IP文件中读取指定字节并转换位long ///</summary> ///<param name="bytesCount">需要转换的字节数，主意不要超过8字节</param> ///<returns></returns> long ReadLongX(int bytesCount) { byte[] _bytes = new byte[8]; ipFile.Read(_bytes, 0, bytesCount); return BitConverter.ToInt64(_bytes, 0); } ///<summary> /// 从IP文件中读取字符串 ///</summary> ///<param name="flag">转向标志</param> ///<returns></returns> string ReadString(int flag) { if (flag == 1 || flag == 2)//转向标志 ipFile.Position = ReadLongX(3); else ipFile.Position -= 1; List<byte> list = new List<byte>(); byte b = (byte)ipFile.ReadByte(); while (b > 0) { list.Add(b); b = (byte)ipFile.ReadByte(); } return Encoding.Default.GetString(list.ToArray()); } }}