unit FtpSock;
{
 CrtSocket for Delphi 32
 Copyright (C) 1999-2001 Paul Toth <tothpaul@free.fr>
 <a href="http://tothpaul.free.fr
This" title="http://tothpaul.free.fr
This">http://tothpaul.free.fr
This</a> 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.
}
interface
uses
 CrtSock,SysUtils;
Function FtpLogon(Server,User,Password:string):integer;
Procedure FtpLogoff;
Function FtpQuote(cmd:string):boolean;
Function FtpOpenWrite(FileName:string):integer;
Function FtpOpenRead(FileName:string):integer;
Function FtpClose(FileHandle:integer):boolean;
Function FtpError:string;
implementation
var
 ftpin,ftpout:TextFile;
 last:string;
 read:boolean;
Function FtpError:string;
 begin
 result:=last;
 end;
Function ReadString:string;
 begin
 repeat
  readln(ftpin,Result);
// writeln(result);
 until (Length(Result)<4)or(Result[4]<>'-');
 last:=Result;
 end;
Procedure WriteString(s:string);
 begin
// writeln('>>>',s);
 WriteLn(ftpout,s);
 end;
Function Status:char;
 var
 s:string;
 begin
 s:=ReadString;
 if s='' then Status:='?' else Status:=s[1];
 end;
Function Exec(cmd:string):char;
 begin
 Writestring(cmd);
 Result:=Status;
 end;
Function FtpLogon(Server,User,Password:string):integer;
 begin
 Result:=CallServer(Server,21);
 if Result>0 then begin
  AssignCrtSock(Result,ftpin,ftpout);
  if Status='2' then begin
  if (Exec('USER '+User)='3') and (Exec('PASS '+Password)='2') then exit;
  Disconnect(Result);
  Result:=-3;
  end else begin
  Disconnect(Result);
  Result:=-2;
  end;
 end;
 end;
Procedure FtpLogoff;
 begin
 Exec('QUIT');
 CloseFile(ftpout);
 end;
Function FtpQuote(cmd:string):boolean;
 begin
 Writestring(Cmd);
 Result:=(Status='2');
 end;
Function GetValue(var s:string):integer;
 var
 i:integer;
 begin
 i:=length(s); while s[i]<>',' do dec(i);
 Result:=StrToInt(copy(s,i+1,3));
 SetLength(s,i-1);
 end;
Function FtpOpenWrite(FileName:string):integer;
 var
 s:string;
 b,e:integer;
 port:word;
 begin
 read:=false;
 Result:=-1;
 if Exec('PASV')<>'2' then exit;
 b:=4; while (b<length(last)) and (not (last[b] in ['0'..'9'])) do inc(b);
 e:=Length(last); while (e>0) and (not (last[b] in ['0'..'9'])) do dec(b);
 s:=copy(last,b,e-b-1);
 port:=getvalue(s);
 port:=256*getvalue(s)+port;
 for e:=1 to Length(s) do if s[e]=',' then s[e]:='.'; // replace "," by "." in IP address
 WriteString('STOR '+FileName);
// writeln('call ',s,':',port);
 Result:=CallServer(s,port);
 if (Status<>'1')and(Result>=0) then begin
  Disconnect(Result);
  Result:=-1;
 end;
 end;
Function FtpOpenRead(FileName:string):integer;
 var
 s:string;
 b,e:integer;
 port:word;
 begin
 read:=true;
 Result:=-1;
 if Exec('PASV')<>'2' then exit;
 b:=4; while (b<length(last)) and (not (last[b] in ['0'..'9'])) do inc(b);
 e:=Length(last); while (e>0) and (not (last[b] in ['0'..'9'])) do dec(b);
 s:=copy(last,b,e-b-1);
 port:=getvalue(s);
 port:=256*getvalue(s)+port;
 for e:=1 to Length(s) do if s[e]=',' then s[e]:='.'; // replace "," by "." in IP address
 WriteString('RETR '+FileName);
 Result:=CallServer(s,port);
 if (Status<>'1')and(Result>=0) then begin
  Disconnect(Result);
  Result:=-1;
 end;
 end;
Function FtpClose(FileHandle:integer):boolean;
 begin
 Disconnect(FileHandle);
 result:=Status='2';
 end;
end.