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