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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Cosray\Assets; |
| 6 | |
| 7 | use Cosray\Exception\RuntimeException; |
| 8 | |
| 9 | class Util |
| 10 | { |
| 11 | public static function isAnimatedGif(string $fileName): bool |
| 12 | { |
| 13 | // Check if the file exists |
| 14 | if (!file_exists($fileName)) { |
| 15 | throw new RuntimeException('File does not exist: ' . $fileName); |
| 16 | } |
| 17 | |
| 18 | // Open the file |
| 19 | $fileHandle = fopen($fileName, 'rb'); |
| 20 | |
| 21 | if (!$fileHandle) { |
| 22 | throw new RuntimeException('File could not be opened: ' . $fileName); |
| 23 | } |
| 24 | |
| 25 | // Read the first few bytes of the file |
| 26 | $header = fread($fileHandle, 3); |
| 27 | |
| 28 | // Close the file handle |
| 29 | fclose($fileHandle); |
| 30 | |
| 31 | // Check if the file header matches the GIF magic number |
| 32 | if ($header === 'GIF') { |
| 33 | $fileHandle = fopen($fileName, 'rb'); |
| 34 | $frameCount = 0; |
| 35 | |
| 36 | while (!feof($fileHandle) && $frameCount < 2) { |
| 37 | $chunk = fread($fileHandle, 1024 * 100); // read 100kb at a time |
| 38 | $frameCount += substr_count($chunk, "\x00\x21\xF9\x04"); |
| 39 | |
| 40 | if ($frameCount > 1) { |
| 41 | fclose($fileHandle); |
| 42 | |
| 43 | return true; |
| 44 | } |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | return false; |
| 49 | } |
| 50 | } |