标题: C#读取纯真版QQ IP数据库示例
作者: dnawo
日期: 2008-06-04 06:50 PM
分类: Web编程
内容: 复制内容到剪贴板 程序代码using System;
using System.Text;
using System.IO;
/// <summary>
///QQWry 的摘要说明
//纯真版QQ IP数据库下载:http://www.cz88.net/fox/
/// </summary>
public class QQWry
{
//第一种模式
private const byte REDIRECT_MODE_1 = 0x01;
//第二种模式
private const byte REDIRECT_MODE_2 = 0x02;
//每条记录长度
private const int IP_RECORD_LENGTH = 7;
//数据库文件
private FileStream ipFile;
private string ipFile2;
private const string unCountry = "未知国家";
private const string unArea = "未知地区";
//索引开始位置
private long ipBegin;
//索引结束位置
private long ipEnd;
//IP地址对象
private IPLocation loc;
//存储文本内容
private byte[] buf;
//存储3字节
private byte[] b3;
//存储4字节
private byte[] b4;
/// <summary>
/// 构造函数
/// </summary>
/// <param name="ipfile">IP数据库文件绝对路径</param>
/// <returns></returns>
public QQWry(string ipfile)
{
buf = new byte[100];
b3 = new byte[3];
b4 = new byte[4];
ipFile2 = ipfile;
}
/// <summary>
/// 搜索IP地址搜索
/// </summary>
/// <param name="ip"></param>
/// <returns></returns>
public IPLocation SearchIPLocation(string ip)
{
try
{
ipFile = new FileStream(ipFile2, FileMode.Open);
ipBegin = readLong4(0);
ipEnd = readLong4(4);
loc = new IPLocation();
//将字符IP转换为字节
string[] ipSp = ip.Split('.');
if (ipSp.Length != 4)
{
throw new ArgumentOutOfRangeException("不是合法的IP地址!");
}
byte[] IP = new byte[4];
for (int i = 0; i < IP.Length; i++)
{
IP[i] = (byte)(Int32.Parse(ipSp[i]) & 0xFF);
}
IPLocation local = null;
long offset = locateIP(IP);
if (offset != -1)
{
local = getIPLocation(offset);
}
if (local == null)
{
local = new IPLocation();
local.area = unArea;
local.country = unCountry;
}
ipFile.Dispose();
return local;
}
catch (Exception ex)
{
return new IPLocation();
}
finally
{
ipFile.Dispose();
}
}
/// <summary>
/// 取得具体信息
/// </summary>
/// <param name="offset"></param>
/// <returns></returns>
private IPLocation getIPLocation(long offset)
{
ipFile.Position = offset + 4;
//读取第一个字节判断是否是标志字节
byte one = (byte)ipFile.ReadByte();
if (one == REDIRECT_MODE_1)
{
//第一种模式
//读取国家偏移
long countryOffset = readLong3();
//转至偏移处
ipFile.Position = countryOffset;
//再次检查标志字节
byte b = (byte)ipFile.ReadByte();
if (b == REDIRECT_MODE_2)
{
loc.country = readString(readLong3());
ipFile.Position = countryOffset + 4;
}
else
loc.country = readString(countryOffset);
//读取地区标志
loc.area = readArea(ipFile.Position);
}
else if (one == REDIRECT_MODE_2)
{
//第二种模式
loc.country = readString(readLong3());
loc.area = readArea(offset + 8);
}
else
{
//普通模式
loc.country = readString(--ipFile.Position);
loc.area = readString(ipFile.Position);
}
return loc;
}
/// <summary>
/// 读取地区名称
/// </summary>
/// <param name="offset"></param>
/// <returns></returns>
private string readArea(long offset)
{
ipFile.Position = offset;
byte one = (byte)ipFile.ReadByte();
if (one == REDIRECT_MODE_1 || one == REDIRECT_MODE_2)
{
long areaOffset = readLong3(offset + 1);
if (areaOffset == 0)
return unArea;
else
{
return readString(areaOffset);
}
}
else
{
return readString(offset);
}
}
/// <summary>
/// 读取字符串
/// </summary>
/// <param name="offset"></param>
/// <returns></returns>
private string readString(long offset)
{
ipFile.Position = offset;
int i = 0;
for (i = 0, buf[i] = (byte)ipFile.ReadByte(); buf[i] != (byte)(0); buf[++i] = (byte)ipFile.ReadByte()) ;
if (i > 0)
return Encoding.Default.GetString(buf, 0, i);
else
return "";
}
/// <summary>
/// 查找IP地址所在的绝对偏移量
/// </summary>
/// <param name="ip"></param>
/// <returns></returns>
private long locateIP(byte[] ip)
{
long m = 0;
int r;
//比较第一个IP项
readIP(ipBegin, b4);
r = compareIP(ip, b4);
if (r == 0)
return ipBegin;
else if (r < 0)
return -1;
//开始二分搜索
for (long i = ipBegin, j = ipEnd; i < j; )
{
m = this.getMiddleOffset(i, j);
readIP(m, b4);
r = compareIP(ip, b4);
if (r > 0)
i = m;
else if (r < 0)
{
if (m == j)
{
j -= IP_RECORD_LENGTH;
m = j;
}
else
{
j = m;
}
}
else
return readLong3(m + 4);
}
m = readLong3(m + 4);
readIP(m, b4);
r = compareIP(ip, b4);
if (r <= 0)
return m;
else
return -1;
}
/// <summary>
/// 从当前位置读取四字节,此四字节是IP地址
/// </summary>
/// <param name="offset"></param>
/// <param name="ip"></param>
private void readIP(long offset, byte[] ip)
{
ipFile.Position = offset;
ipFile.Read(ip, 0, ip.Length);
byte tmp = ip[0];
ip[0] = ip[3];
ip[3] = tmp;
tmp = ip[1];
ip[1] = ip[2];
ip[2] = tmp;
}
/// <summary>
/// 比较IP地址是否相同
/// </summary>
/// <param name="ip"></param>
/// <param name="beginIP"></param>
/// <returns>0:相等,1:ip大于beginIP,-1:小于</returns>
private int compareIP(byte[] ip, byte[] beginIP)
{
for (int i = 0; i < 4; i++)
{
int r = compareByte(ip[i], beginIP[i]);
if (r != 0)
return r;
}
return 0;
}
/// <summary>
/// 比较两个字节是否相等
/// </summary>
/// <param name="bsrc"></param>
/// <param name="bdst"></param>
/// <returns></returns>
private int compareByte(byte bsrc, byte bdst)
{
if ((bsrc & 0xFF) > (bdst & 0xFF))
return 1;
else if ((bsrc ^ bdst) == 0)
return 0;
else
return -1;
}
/// <summary>
/// 从当前位置读取4字节,转换为长整型
/// </summary>
/// <param name="offset"></param>
/// <returns></returns>
private long readLong4(long offset)
{
long ret = 0;
ipFile.Position = offset;
ret |= (ipFile.ReadByte() & 0xFF);
ret |= ((ipFile.ReadByte() << 8) & 0xFF00);
ret |= ((ipFile.ReadByte() << 16) & 0xFF0000);
ret |= ((ipFile.ReadByte() << 24) & 0xFF000000);
return ret;
}
/// <summary>
/// 根据当前位置,读取3字节
/// </summary>
/// <param name="offset"></param>
/// <returns></returns>
private long readLong3(long offset)
{
long ret = 0;
ipFile.Position = offset;
ret |= (ipFile.ReadByte() & 0xFF);
ret |= ((ipFile.ReadByte() << 8) & 0xFF00);
ret |= ((ipFile.ReadByte() << 16) & 0xFF0000);
return ret;
}
/// <summary>
/// 从当前位置读取3字节
/// </summary>
/// <returns></returns>
private long readLong3()
{
long ret = 0;
ret |= (ipFile.ReadByte() & 0xFF);
ret |= ((ipFile.ReadByte() << 8) & 0xFF00);
ret |= ((ipFile.ReadByte() << 16) & 0xFF0000);
return ret;
}
/// <summary>
/// 取得begin和end中间的偏移
/// </summary>
/// <param name="begin"></param>
/// <param name="end"></param>
/// <returns></returns>
private long getMiddleOffset(long begin, long end)
{
long records = (end - begin) / IP_RECORD_LENGTH;
records >>= 1;
if (records == 0)
records = 1;
return begin + records * IP_RECORD_LENGTH;
}
}
public class IPLocation
{
public String country;
public String area;
public IPLocation()
{
country = area = "";
}
public IPLocation getCopy()
{
IPLocation ret = new IPLocation();
ret.country = country;
ret.area = area;
return ret;
}
}
使用示例：
复制内容到剪贴板 程序代码QQWry qq = new QQWry("F:\\QQWry.Dat");
IPLocation ip = qq.SearchIPLocation("211.138.147.158");//IP地址
Response.Write(ip.country);//国家
Response.Write(ip.area);//地区
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