/***************************************************************************
 *   fqterm, a terminal emulator for both BBS and *nix.                    *
 *   Copyright (C) 2008 fqterm development group.                          *
 *                                                                         *
 *   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.,                                       *
 *   51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.               *
 ***************************************************************************/

#ifndef FQTERM_IPLOCATION_H
#define FQTERM_IPLOCATION_H

#include <stdio.h>
#include <stdlib.h>

class QString;

namespace FQTerm {

#define MAX_RECURSIVE_IP_DATA_DEPTH 100

typedef unsigned long uint32;


class FQTermIPLocation {
public:
  static FQTermIPLocation* getInstance();
  static void Destroy();

  bool getLocation(QString &url, QString &country, QString &city);
  bool getLocation(QString &url, QByteArray &country, QByteArray &city);

private:
  struct IPDatabase {
    uint32 offset_first_start_ip; // first abs offset of start ip
    uint32 offset_last_start_ip; // last abs offset of start ip
    uint32 cur_start_ip; // start ip of current search range
    uint32 cur_end_ip; // end ip of current search range
    uint32 offset_cur_end_ip; // where is the current end ip saved
    FILE *ipfp; // IO Channel to read file
  };

  FQTermIPLocation(const QString &pathLib);
  ~FQTermIPLocation();
  uint32 byteArrayToInt(char *ip, int count);
  void readFrom(FILE *fp, uint32 offset, char *buf, int len);
  int readLineFrom(FILE *fp, uint32 offset, QByteArray &ret_str);
  uint32 getString(FILE *fp, uint32 offset, uint32 lastoffset, QByteArray &str,
    unsigned int flag, int maxRecursiveDepth = MAX_RECURSIVE_IP_DATA_DEPTH);
  void getCountryCity(FILE *fp, uint32 offset, QByteArray &country, QByteArray &city);
  void setIpRange(int rec_no, IPDatabase *f);


  IPDatabase *ipDatabase_;
  bool isFileExiting_;

  static FQTermIPLocation* instance_;
};

}  // namespace FQTerm

#endif  // FQTERM_IPLOCATION_H