u_observerbfr.pas

linux program to read packet data

(*
 * One Way Network Sniffer (OWNS)
 * Copyright (C) 2001-2002 OWNS
 *
 * http://owns.sourceforge.net/
 * http://www.owns.st
 *
 * 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.
 *)

(* $Id: u_ObserverBfr.pas,v 1.3 2001/08/05 13:12:02 owns Exp $ *)
unit u_ObserverBfr;
interface
uses SysUtils,
     classes,u_TCPPacket;


type
  TObserverBfr  = class
  private
    FFileStream : TFileStream;
    FPositionCourante : Cardinal;
    FCurrentPacket : PChar;
    FPacketLength : Cardinal;
    FMomentReception : Cardinal;
    FFileSize : INTEGER;
  public
    constructor create(p_FileName : String);
    destructor destroy; override;
    procedure readPacket;
    property CurrentPacket : PChar read FCurrentPacket;
    property PacketLength : Cardinal read FPacketLength;
    property MomentReception : Cardinal read FMomentReception;
    property PositionCourante : Cardinal read FPositionCourante;
    property FileSize : INTEGER read FFileSize;
  end;

implementation

constructor TObserverBfr.create(p_FileName : String);
begin
  FFileStream := TFileStream.Create(p_FileName,fmOpenRead);
  FFileSize := FFileStream.size;

  // on lit l'entete du fichier
  FFileStream.seek(109,soFromBeginning);

  // initialisation des autres membres
  FCurrentPacket := nil;
  FPacketLength := 0;
  FMomentReception := 0;
end;

// lit un packet dans le fichier de capture
// le paquet lu est dans CurrentPacket. Celui-ci doit 阾re copi