name : Base64ContentEncoder.php <?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\Mime\Encoder; use Symfony\Component\Mime\Exception\RuntimeException; /** * @author Fabien Potencier <fabien@symfony.com> */ final class Base64ContentEncoder extends Base64Encoder implements ContentEncoderInterface { public function encodeByteStream($stream, int $maxLineLength = 0): iterable { if (!\is_resource($stream)) { throw new \TypeError(\sprintf('Method "%s" takes a stream as a first argument.', __METHOD__)); } $filter = stream_filter_append($stream, 'convert.base64-encode', \STREAM_FILTER_READ, [ 'line-length' => 0 >= $maxLineLength || 76 < $maxLineLength ? 76 : $maxLineLength, 'line-break-chars' => "\r\n", ]); if (!\is_resource($filter)) { throw new RuntimeException('Unable to set the base64 content encoder to the filter.'); } while (!feof($stream)) { yield fread($stream, 16372); } stream_filter_remove($filter); } public function getName(): string { return 'base64'; } }