Dúvida para compactar arquivos

procedure TForm1.CompressFiles(Files: TStrings; const Filename: String);
var
  infile, outfile, tmpFile : TFileStream;
  compr : TCompressionStream;
  i,l : Integer;
  s : String;
begin
  if Files.Count > 0 then
  begin
    outFile := TFileStream.Create(Filename,fmCreate);
    try
      l := Files.Count;
      outfile.Write(l,SizeOf(l));
      for i := 0 to Files.Count-1 do
      begin
        infile := TFileStream.Create(Files[i],fmOpenRead);
        try
          s := ExtractFilename(Files[i]);
          l := Length(s);
          outfile.Write(l,SizeOf(l));
          outfile.Write(s[1],l);
          l := infile.Size;
          outfile.Write(l,SizeOf(l));
          tmpFile := TFileStream.Create(´tmp´,fmCreate);
          compr := TCompressionStream.Create(clMax,tmpfile);
          try
            compr.CopyFrom(infile,l);
          finally
            compr.Free;
            tmpFile.Free;
          end;
          tmpFile := TFileStream.Create(´tmp´,fmOpenRead);
          try
            outfile.CopyFrom(tmpFile,0);
          finally
            tmpFile.Free;
          end;
        finally
          infile.Free;
        end;
      end;
    finally
      outfile.Free;
    end;
    DeleteFile(´tmp´);
  end;

end;