laravel5/vendor/symfony/mime/Encoder/EightBitContentEncoder.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;

/**
 * @author Fabien Potencier <fabien@symfony.com>
 */
final class EightBitContentEncoder implements ContentEncoderInterface
{
    public function encodeByteStream($stream, int $maxLineLength = 0): iterable
    {
        while (!feof($stream)) {
            yield fread($stream, 16372);
        }
    }

    public function getName(): string
    {
        return '8bit';
    }

    public function encodeString(string $string, ?string $charset = 'utf-8', int $firstLineOffset = 0, int $maxLineLength = 0): string
    {
        return $string;
    }
}