#784124 php5-imagick: readimage() sends ghostscript PDF error directly to stdout, and cannot be suppressed.

Package:
php5-imagick
Source:
php-imagick
Submitter:
Michael
Date:
2023-04-18 12:45:06 UTC
Severity:
normal
#784124#5
Date:
2015-05-03 10:24:04 UTC
From:
To:
Hi,

This bug appears when reading a PDF with readImage() in imagick-php. Most
errors are thrown as an ImagickException. However, when an out-of-range page is
requested from a PDF, output is also sent directly to standard output, in
addition to the exception. Unlike normal output, it is impossible to suppress
this extra text with the normal tools (catch, @readImage, ob_start(), see
also[1]).

Example ('doc.pdf' contains two blank pages- any short file will work):

<?php
$im = new Imagick();
try {
        $im -> readImage("doc.pdf[5]");
        $im -> destroy();
} catch(ImagickException $e) {
        echo "Error: " . $e -> getMessage() . "\n";
}
?>

Which prints:

Requested FirstPage is greater than the number of pages in the file: 2
   No pages will be processed (FirstPage > LastPage).
Error: Failed to read the file

The extra output (aside from being incorrect) should be triggered as a
notice/warning, or included with the exception. The text appears to be
generated by GhostScript.

See attached test and example doc.