Manually check for jpeg the end of the file marker ffd9 (?) In php to catch truncation errors

Question

basically trying to remove corrupt, prematurely ending jpeg files from the collection. I realized that if the end-of-file marker was missing, this means that the image is truncated, and therefore I consider it invalid for my purposes. Is this a sound verification method? if so, what ideas can i implement in php?

amuses

Answer 1

try the following:

$jpgdata = file_get_contents('image.jpg');

if (substr($jpgdata,-2)!="\xFF\xD9") {
  echo 'Bad file';
}

This will load the entire jpg file into memory and may result in an error for large files.

Alternative:

$jpgdata = fopen('image.jpg', 'r'); // 'r' is for reading
fseek($jpgdata, -2, SEEK_END); // move to EOF -2
$eofdata = fread($jpgdata, 2);
fclose($jpgdata);

if ($eofdata!="\xFF\xD9") echo 'Bad file';

Answer 2

try catch @ :

    try
    {
        if (!@imagecreatefromjpeg($photoPath)
            throw new Exception('The image is corrupted!');
    }
    catch(Exception $e)
    {
        $error = $e->getMessage();
        Yii::app()->user->setFlash('addphoto', Yii::t('app', $error));
    }