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Fixed issue with detecting animated GIFs

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This commit is contained in:
Matthew Barbour 2020-10-08 17:08:42 -05:00
parent 49a3277cca
commit 45511cbcda
1 changed files with 5 additions and 3 deletions
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8
ext/mime/mime_type.php
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@ -131,15 +131,17 @@ class MimeType
if (($fh = @fopen($image_filename, 'rb'))) { if (($fh = @fopen($image_filename, 'rb'))) {
try { try {
//check if gif is animated (via https://www.php.net/manual/en/function.imagecreatefromgif.php#104473) //check if gif is animated (via https://www.php.net/manual/en/function.imagecreatefromgif.php#104473)
$chunk = false;
while (!feof($fh) && $is_anim_gif < 2) { while (!feof($fh) && $is_anim_gif < 2) {
$chunk = fread($fh, 1024 * 100); $chunk = ($chunk ? substr($chunk, -20) : "") . fread($fh, 1024 * 100); //read 100kb at a time
$is_anim_gif += preg_match_all('#\x00\x21\xF9\x04.{4}\x00[\x2C\x21]#s', $chunk, $matches); $is_anim_gif += preg_match_all('#\x00\x21\xF9\x04.{4}\x00(\x2C|\x21)#s', $chunk, $matches);
} }
} finally { } finally {
@fclose($fh); @fclose($fh);
} }
} }
return ($is_anim_gif == 0); return ($is_anim_gif >=2);
} }