TCPDI useTemplate excedes timeout with somes pdf - php

Question

I'm triying to put a text into some pdfs with TCPDI.
It works fine in most pdfs, but in some pdf the code get stuck when it reachs the useTemplate() function, and got 500 error (Maximum time exceded).
They are not long pdf (1,2,3 pages max), and anothers pdfs with more pages works fine. Here is my code:
$pdf = new TCPDI();
$pageCount = $pdf->setSourceFile($path);
for ($pageNo = 1; $pageNo <= $pageCount; $pageNo++) {
$templateId = $pdf->importPage($pageNo);
$size = $pdf->getTemplateSize($templateId);
if ($size['w'] > $size['h']) {
$pdf->AddPage('L', array($size['w'], $size['h']));
} else {
$pdf->AddPage('P', array($size['w'], $size['h']));
}
$pdf->useTemplate($templateId); //Here is where it takes so long that it exceeds time
$pdf->SetFont('Helvetica');
$pdf->SetFontSize(10);
$pdf->SetTextColor(255, 0, 0);
$pdf->SetXY(2, 0);
$pdf->Write(0, 'Code nº 4');
}
$pdf->Output($file,'D');
Is there any prop of the pdf that can make it stay locked? There are alterntives?
I have a code that process several pdf with this code in a loop an put they into a zip, and when in the chain is one pdf that jam the code the zip obviously dind't process, so if there are a way to detect what pdf are goingo to give me problem, I cant jump over there and generate the zip with the goods one.
I have not control over the pdfs, their are upload by a lot of clients
EDIT: In log there are more than a million of lines similar to PHP Warning: Illegal string offset 'DAmip' in ...\TCPDF\tcpdi_parser.php on line 712 before Maximum execution Time Fatal Error

Answer 1

Same problem for me.
I 'solved' the situation adding the line set_time_limit(10); before the line
while (strspn($data{$offset}, "\x00\x09\x0a\x0c\x0d\x20") == 1) {
I know it's not the right solution but, at least, doesn't block your program

Answer 2

I suggest you to read my comment on GitHub : https://github.com/pauln/tcpdi_parser/pull/23
The function getDictValue() of tcpdi_parser.pdf is incompatible with some PDF files.
All is explained in my response dated of this day.
Suggested modification :
private function getDictValue($offset, &$data) {
$objval = array();
// Extract dict from data
$i = 1;
$dict = "";
$offset+= 2;
$is_bracket = false;
do {
if ($data[$offset] == "[") {
$is_bracket = true;
$dict.= $data[$offset];
} else if ($data[$offset] == "]") {
$is_bracket = false;
$dict.= $data[$offset];
} else if (!$is_bracket && ($data[$offset] == "<") && ($data[$offset + 1] == "<")) {
$i++;
$dict.= "<<";
$offset++;
} else if (!$is_bracket && ($data[$offset] == ">") && ($data[$offset + 1] == ">")) {
$i--;
$dict.= ">>";
$offset++;
} else {
$dict.= $data[$offset];
}
$offset++;
} while ($i > 0);
// Now that we have just the dict, parse it.
$dictoffset = 0;
do {
// Get dict element.
file_put_contents("debug_tcpdi.txt", "getRawObject($dictoffset, data) depuis getDictValue()" . "\r\n", FILE_APPEND);
list($key, $eloffset) = $this->getRawObject($dictoffset, $dict);
if ($key[0] == '>>') {
break;
}
file_put_contents("debug_tcpdi.txt", "getRawObject($eloffset, data) depuis getDictValue()" . "\r\n", FILE_APPEND);
list($element, $dictoffset) = $this->getRawObject($eloffset, $dict);
$objval['/'.$key[1]] = $element;
unset($key);
unset($element);
} while (true);
return array($objval, $offset);
}