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procedure TForm1.ServerClientRead(Sender: TObject;
  Socket: TCustomWinSocket);
var
pBuffer: pointer;
Buffer: array[0..4096] of Byte; // die Größe des Puffers ist beliebig, müsste nur (s.u.)
SizeOfBuffer: integer;

input : string;
begin
input := Socket.ReceiveText;

If (Server.Tag = 1) then
  begin
  pBuffer := @Buffer;
  SizeOfBuffer := Socket.ReceiveBuf(pBuffer^, 4096); //hier angeglichen werden
  FileStream.Write(pBuffer^, SizeOfBuffer);
  Inc(AlreadyReceived, SizeOfBuffer);
  lbl_sent.Caption := IntToStr(AlreadyReceived) + ' bytes empfangen';
  Socket.SendText(IntToStr(AlreadyReceived));
 end;

If (Server.Tag = 3) then
begin
lbl_remsize.Caption := input;
Server.Tag := 1;
end;

If (Server.Tag) = 2 then
begin
lbl_remname.Caption := input;
Server.Tag := 3;
FileStream := TFileStream.Create('C:\save.txt', fmCreate or fmOpenWrite);
end;

If (Server.Tag = 0) and (input = 'handshake') then
begin
Server.Tag := 2;
end;