Linux下仿QQ--eva0.4.1源码研究
Linux下仿QQ--eva0.4.1源码研究
争取一天看一个文件，随便找一个好看的看起eva/src/api/evaipseek
#ifndef EVAIPSEEKER_H
#define EVAIPSEEKER_H
#include <string>
#include <fstream>
//一看头文件，只有file操作，看来不是socket相关
class EvaIPSeeker
{
public:
EvaIPSeeker();
EvaIPSeeker(std::string absPath);
~EvaIPSeeker();
const std::string getIPLocation(const std::string ip);
const std::string getIPLocation(const unsigned int ip);
const bool isQQWryExisted();
private:
unsigned int searchIP(const unsigned int ip);
unsigned int readIP(unsigned int offset);
unsigned int getMiddleOffset(const unsigned int begin, const unsigned int end);
int compareIP(const unsigned int ip1, const unsigned int ip2);
std::string getIPRecord(const unsigned int offset);
std::string readString(const unsigned int offset);
std::string readArea(const unsigned int offset);
bool getIndexOffset(std::fstream& inputfile);
private:
std::fstream ipFile; //file i/o stream
std::string fileName; //the data file path
int firstIndexOffset; //the first index offset of the index area
int lastIndexOffset; //the last index offset of the index area
char byte4[4]; //tmp char array
char byte3[3]; //tmp char array
};
#endif
/***************************************************************************
* Copyright (C) 2005 by casper *
* tlmcasper@163.com *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <iostream>
#include <string>
#include <fstream>
#include "evaipseeker.h"
#include "evaipaddress.h"//这里还依赖一个文件，看来得看看这个
#define STRING_LEN 80
#define IP_RECORD_LENGTH 7
#define REDIRECT_MODE_1 0x01
#define REDIRECT_MODE_2 0x02
#define DATAFILENAME "QQWry.dat" //qq直接用文件，都不用sql
#define READINT3(X) (( X[0] & 0xFF )|(( X[1] & 0xFF)<< 8 )|(( X[2] & 0xFF )<< 16 )) //用移位操作的都是高手，是否？
#define READINT4(X) (( X[0] & 0xFF )|(( X[1] & 0xFF)<< 8 )|(( X[2] & 0xFF )<< 16 )|(( X[3] & 0xFF ) << 24 ))
using namespace std;
//get the path of IP data file which is in the working directory,store in @fileName
//param:null
//return:null
EvaIPSeeker::EvaIPSeeker()
{
fileName = DATAFILENAME;
}
//get the absolute path of IP data file,store it in @fileName;
//param: string absPath
//return: null
EvaIPSeeker::EvaIPSeeker(string absPath)
{
fileName = absPath + "/" + DATAFILENAME;
}
//check the status of IP data file,close it if it opened.
//param: null
//return: null
EvaIPSeeker::~EvaIPSeeker()
{
if(ipFile.is_open())
ipFile.close();
}
//check if QQWry.dat exists
//param: null
//return: true or false
const bool EvaIPSeeker::isQQWryExisted()
{
ipFile.open(fileName.c_str(), ios::in);
if(!ipFile)
return false;
else
{
ipFile.close();
return true;
}
}
//search ip in the index area of IP data file,return the offset of IP record if found.
//param: unsigned int ip
//return: unsigned int offset
unsigned int EvaIPSeeker::searchIP(const unsigned int ip)
{
unsigned int startIP;
unsigned int endIP;
unsigned int midIP,mOffset;
int r;
unsigned int i,j;
startIP = readIP(firstIndexOffset);
endIP = readIP(lastIndexOffset);
r = compareIP(ip,startIP);
if(r == 0)
return firstIndexOffset;
else if(r < 0)
return 0;
for(i = firstIndexOffset, j = lastIndexOffset; i < j;)
{
mOffset = getMiddleOffset(i, j);
midIP = readIP(mOffset);
r = compareIP(ip, midIP);
if(r > 0)
i = mOffset;
else if(r < 0)
{
if(mOffset == j)
{
j -= IP_RECORD_LENGTH;
mOffset = j;
}
else
j = mOffset;
}
else
{
if(!ipFile.is_open())
ipFile.open(fileName.c_str(), ios::in|ios::binary);
ipFile.seekg(mOffset+4, ios::beg);
ipFile.read(byte3, 3);
ipFile.close();
return READINT3(byte3);
}
}
if(!ipFile.is_open())
ipFile.open(fileName.c_str(), ios::in|ios::binary);
ipFile.seekg(mOffset+4, ios::beg);
ipFile.read(byte3, 3);
midIP = readIP(READINT3(byte3));
r = compareIP(ip, midIP);
if(r <= 0) return READINT3(byte3);
else return 0;
}
//read 4 bytes start from the offset,and change them to an IP address.
//param: unsigned int offset
//return: unsigned int IP
unsigned int EvaIPSeeker::readIP(unsigned int offset)
{
unsigned int tmpIP;
if(!ipFile.is_open())
ipFile.open(fileName.c_str(), ios::in|ios::binary);
ipFile.seekg(offset, ios::beg);
ipFile.read(byte4,4);
tmpIP = READINT4(byte4);
ipFile.close();
return tmpIP;
}
//compare two IP
//param: unsigned int ip1, unsigned int ip2
//return: int result
int EvaIPSeeker::compareIP(const unsigned int ip1, const unsigned int ip2)
{
if( ip1 > ip2 ) return 1;
else if ( ip1 < ip2 ) return -1;
else return 0;
}
//get the middle offset of two offsets.
//param: unsigned int begin, unsigned int end
//return: unsigned int theMiddleOffset
unsigned int EvaIPSeeker::getMiddleOffset(const unsigned int begin, const unsigned int end)
{
int records = (end - begin) / IP_RECORD_LENGTH;
records >>= 1;
if(records == 0) records = 1;
return begin + records * IP_RECORD_LENGTH;
}
//read a string start from the offset until meet a char '\0'
//param: unsigned int offset
//return: string str
string EvaIPSeeker::readString(const unsigned int offset)
{
static char tmpstr[STRING_LEN];
string str;
ipFile.seekg(offset, ios::beg);
ipFile.getline(tmpstr,STRING_LEN,'\0');
str = tmpstr;
return str;
}
//get one IP record (country and area) of the offset
//param: unsigned int offset
//return: string location
string EvaIPSeeker::getIPRecord(const unsigned int offset)
{
char flag;
string country;
string area;
string location;
unsigned int countryOffset;
if(!ipFile.is_open())
ipFile.open(fileName.c_str(), ios::in|ios::binary);
ipFile.seekg(offset+4, ios::beg);//ignore the ip data
ipFile.get(flag);
if(flag == REDIRECT_MODE_1)
{
ipFile.read(byte3, 3);
countryOffset = READINT3(byte3); //get the offset of country data
ipFile.seekg(countryOffset);
ipFile.get(flag); // check the flag again,maybe it's an other redirectroy
if(flag == REDIRECT_MODE_2)
{
ipFile.read(byte3, 3);
country = readString(READINT3(byte3));
ipFile.seekg(countryOffset+4);//if mode2,we need pass 4 bytes to reach the area data;
}
else
{
country = readString(countryOffset);
}
area = readArea(ipFile.tellg());
}
else if(flag == REDIRECT_MODE_2)
{
ipFile.read(byte3, 3);
country = readString(READINT3(byte3));
area = readArea(offset+8);
}
else
{
ipFile.putback(flag);//make the inside pointer back 1 character
country = readString(ipFile.tellg());
area = readArea(ipFile.tellg());
}
location = country + area;
ipFile.close();
return location;
}
//read the Area data start from the offset.
//param: unsigned int offset
//return: string areaData
string EvaIPSeeker::readArea(const unsigned int offset)
{
char flag;
unsigned int areaOffset;
ipFile.seekg(offset, ios::beg);
ipFile.get(flag);
if(flag == REDIRECT_MODE_1 || flag == REDIRECT_MODE_2)
{
ipFile.read(byte3, 3);
areaOffset = READINT3(byte3);
if(areaOffset != 0)
return readString(areaOffset);
else
return "Unknow Area";//if the areaoffset is zero,it's show there's no data for the area
}
else
return readString(offset);
}
//get the Index arrange of the Index area from infile
//param: fstream& infile
//return: true or false
bool EvaIPSeeker::getIndexOffset(fstream& infile)
{
infile.seekg(ios::beg);
infile.read(byte4, 4);
firstIndexOffset = READINT4(byte4);
infile.read(byte4, 4);
lastIndexOffset = READINT4(byte4);
if(( firstIndexOffset == -1 )||( lastIndexOffset == -1 ))
{
return false;
}
return true;
}
//main function, get the location of an IP address,if IP is not valid or the Data file missed then return IP address.
//param: unsigned int ip
//return: string location or string ip
const string EvaIPSeeker::getIPLocation(const unsigned int ip)
{
EvaIPAddress addr(ip);
if(!isQQWryExisted())
return addr.toString();
ipFile.open(fileName.c_str(), ios::in|ios::binary);
if(!ipFile)
return addr.toString();
else
{
if(!getIndexOffset(ipFile))
{
ipFile.close();
return addr.toString();
}
return getIPRecord(searchIP(addr.IP()));
}
}
//main function, get the location of an IP address,if IP is not valid or the Data file missed then return IP address.
//param: string ip
//return: string location or string ip
const string EvaIPSeeker::getIPLocation(const string ip)
{
EvaIPAddress addr(ip);
if(!addr.isValid())
return addr.toString();
if(!isQQWryExisted())
return addr.toString();
ipFile.open(fileName.c_str(), ios::in|ios::binary);
if(!ipFile)
return addr.toString();
else
{
if(!getIndexOffset(ipFile))
{
ipFile.close();
return addr.toString();
}
return getIPRecord(searchIP(addr.IP()));
}
}
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