FtpSock.pas

unit FtpSock;
 
{
  CrtSocket for Delphi 32
  Copyright (C) 1999-2001  Paul Toth <tothpaul@free.fr>
  http://tothpaul.free.fr
 
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.
 
}
 
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.