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<?php |
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|
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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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|
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namespace Symfony\Component\Mime\Encoder; |
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|
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use Symfony\Component\Mime\CharacterStream; |
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|
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/** |
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* @author Chris Corbyn |
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*/ |
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final class Rfc2231Encoder implements EncoderInterface |
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{ |
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/** |
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* Takes an unencoded string and produces a string encoded according to RFC 2231 from it. |
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*/ |
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public function encodeString(string $string, ?string $charset = 'utf-8', int $firstLineOffset = 0, int $maxLineLength = 0): string |
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{ |
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$lines = []; |
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$lineCount = 0; |
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$lines[] = ''; |
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$currentLine = &$lines[$lineCount++]; |
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|
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if (0 >= $maxLineLength) { |
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$maxLineLength = 75; |
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} |
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|
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$charStream = new CharacterStream($string, $charset); |
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$thisLineLength = $maxLineLength - $firstLineOffset; |
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|
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while (null !== $char = $charStream->read(4)) { |
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$encodedChar = rawurlencode($char); |
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if ('' !== $currentLine && \strlen($currentLine.$encodedChar) > $thisLineLength) { |
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$lines[] = ''; |
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$currentLine = &$lines[$lineCount++]; |
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$thisLineLength = $maxLineLength; |
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} |
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$currentLine .= $encodedChar; |
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} |
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|
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return implode("\r\n", $lines); |
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} |
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} |
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