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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Mime\Encoder;
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/**
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* @author Lars Strojny
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*/
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final class QpContentEncoder implements ContentEncoderInterface
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{
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public function encodeByteStream($stream, int $maxLineLength = 0): iterable
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{
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if (!\is_resource($stream)) {
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throw new \TypeError(sprintf('Method "%s" takes a stream as a first argument.', __METHOD__));
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}
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// we don't use PHP stream filters here as the content should be small enough
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yield $this->encodeString(stream_get_contents($stream), 'utf-8', 0, $maxLineLength);
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}
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public function getName(): string
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{
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return 'quoted-printable';
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}
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public function encodeString(string $string, ?string $charset = 'utf-8', int $firstLineOffset = 0, int $maxLineLength = 0): string
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{
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return $this->standardize(quoted_printable_encode($string));
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}
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/**
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* Make sure CRLF is correct and HT/SPACE are in valid places.
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*/
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private function standardize(string $string): string
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{
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// transform CR or LF to CRLF
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$string = preg_replace('~=0D(?!=0A)|(?<!=0D)=0A~', '=0D=0A', $string);
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// transform =0D=0A to CRLF
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$string = str_replace(["\t=0D=0A", ' =0D=0A', '=0D=0A'], ["=09\r\n", "=20\r\n", "\r\n"], $string);
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return match (\ord(substr($string, -1))) {
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0x09 => substr_replace($string, '=09', -1),
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0x20 => substr_replace($string, '=20', -1),
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default => $string,
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};
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}
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}
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