php imagecreatefromstring() not working

Question

I've got a script that saves user-uploaded images to a MySQL database, and then on another location they can access them. There is also an option where they can crop the image, which works correctly to. However, when I try to render a cropped image (normal images work fine), I get the following:

Warning: imagecreatefromstring(): gd-png: fatal libpng error: Read Error: truncated data in /home/retweety/public_html/uploadr/get.php on line 92
Warning: imagecreatefromstring(): gd-png error: setjmp returns error condition in /home/retweety/public_html/uploadr/get.php on line 92
Warning: imagecreatefromstring(): Passed data is not in 'PNG' format in /home/retweety/public_html/uploadr/get.php on line 92
Warning: imagecreatefromstring(): Couldn't create GD Image Stream out of Data in /home/retweety/public_html/uploadr/get.php on line 92
Warning: imagecrop() expects parameter 1 to be resource, boolean given in /home/retweety/public_html/uploadr/get.php on line 93
Warning: imagepng() expects parameter 1 to be resource, null given in /home/retweety/public_html/uploadr/get.php on line 96
Warning: imagedestroy() expects parameter 1 to be resource, null given in /home/retweety/public_html/uploadr/get.php on line 97

This is my code:

$imgdata = $row['original']; // Line 86
$variables = json_decode($row['cropped']); // Line 87

$im = imagecreatefromstring($imgdata); // Line 89
$im2 = imagecrop($im, ['x' => $variables->x, 'y' => $variables->y, 'width' => $variables->width, 'height' => $variables->height]); // Line 90
if ($im2 !== FALSE) { // Line 91
    header('Content-Type: image/png'); // Line 92
    imagepng($im2); // Line 93
    imagedestroy($im2); // Line 94
} else { // Line 95
    echo "Could not crop image."; // Line 96
} // Line 97

Edit: This is a var_dump of $variables for one of the pictures

object(stdClass)#3 (4) { ["x"]=> int(87) ["y"]=> int(15) ["width"]=> int(142) ["height"]=> int(82) }

$imgdata contains raw image data. I have the base64 encoded version of the data for the same image on the URL below. I didn't paste it here because it's too long.

https://uploadr.retweety.deals/katherine/1041f1a2511aa8179d9809dad66418ead85a0790/75cc53e4ee0f96acd2a2876c2484f91fcfc6c43d/normal

can you show the output of echo var_dump($variables);?

Black
– Black

2018-02-11 10:17:06 +00:00
Commented Feb 11, 2018 at 10:17 — Black
– Black, Commented Feb 11, 2018 at 10:17
Could you also add an example value for $row['original']?

Tom Udding
– Tom Udding

2018-02-11 10:40:11 +00:00
Commented Feb 11, 2018 at 10:40 — Tom Udding
– Tom Udding, Commented Feb 11, 2018 at 10:40

Zoltán Süle · Accepted Answer · 2018-02-11 11:41:40Z

1

I tested your code with the $imgdata. for me it looks like the image source stored in the database is corrupt. Otherwise you would be able to display the original image without error. I wasn't able to display the image by this code. I got the same errors.

$imgdata = base64_decode($imgdata);
$im      = imagecreatefromstring($imgdata);
if ($im !== false) {
  header('Content-Type: image/png');
  imagepng($im);
  imagedestroy($im);
}

answered Feb 11, 2018 at 11:41

Zoltán Süle

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