name : QpContentEncoder.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 Lars Strojny */ final class QpContentEncoder 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__)); } // we don't use PHP stream filters here as the content should be small enough yield $this->encodeString(stream_get_contents($stream), 'utf-8', 0, $maxLineLength); } public function getName(): string { return 'quoted-printable'; } public function encodeString(string $string, ?string $charset = 'utf-8', int $firstLineOffset = 0, int $maxLineLength = 0): string { return $this->standardize(quoted_printable_encode($string)); } /** * Make sure CRLF is correct and HT/SPACE are in valid places. */ private function standardize(string $string): string { // transform CR or LF to CRLF $string = preg_replace('~=0D(?!=0A)|(?<!=0D)=0A~', '=0D=0A', $string); // transform =0D=0A to CRLF $string = str_replace(["\t=0D=0A", ' =0D=0A', '=0D=0A'], ["=09\r\n", "=20\r\n", "\r\n"], $string); return match (\ord(substr($string, -1))) { 0x09 => substr_replace($string, '=09', -1), 0x20 => substr_replace($string, '=20', -1), default => $string, }; } }