function pdf_to_image_count_pages in PDF to ImageField 7.3

Same name and namespace in other branches

1. 7.2 pdf_to_image.module \pdf_to_image_count_pages()

Use imagemagick routine to count the number of pages in a given PDF.

1 call to pdf_to_image_count_pages()

pdf_to_image_generate_process in ./pdf_to_image.module

Processing pdf file creation.

File

./pdf_to_image.module, line 682

Generates thumbnail image(s) from an uploaded PDF.

Code

function pdf_to_image_count_pages($filepath) {

  // Assume the 'identify' binary lives next to the 'convert' binary.
  $convert_path = variable_get('imagemagick_convert', '/usr/bin/convert');
  $identify_path = dirname($convert_path) . '/identify';

  // Identify renders every page in the pdf to count the number of pages which
  // can be a problem (server timeout) when processing a pdf with many pages.
  // The better command commented because it working very slow.
  // "{$identify_path} -format %n " . escapeshellarg($fpath) . ' 2> /dev/null';.
  // Apparently this method is even faster, from
  // http://drupal.org/node/1537658
  // Though we'll only use it if ghostscript is present and configured.
  $gs_path = variable_get('gs_path', '/usr/local/bin/gs');
  if (is_executable($gs_path)) {
    $command = "{$gs_path} -q -dNODISPLAY -c \"(" . trim(pdf_to_image_escapeshellarg($filepath), "'") . ") (r) file runpdfbegin pdfpagecount = quit\"";
  }
  else {

    // This one instead asks for more pages than the document has, then reads
    // the last page that the document actually returned.
    $command = "{$identify_path} " . pdf_to_image_escapeshellarg($filepath) . '[9999] | grep "Requested FirstPage" | cut -d : -f2';
  }
  $count = pdf_to_image_shell_exec($command);
  $count = (int) trim($count);
  if ($count == 0) {
    watchdog('pdf_to_image', 'Attempting to count the number of pages in PDF returned zero. This may be a currupt PDF, or the imagemagick tool may not be installed or working right. Please check the status page.', array(), WATCHDOG_ERROR);
  }
  return $count;
}