<?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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use Symfony\Component\Mime\CharacterStream;
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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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if (0 >= $maxLineLength) {
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$maxLineLength = 75;
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}
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$charStream = new CharacterStream($string, $charset);
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$thisLineLength = $maxLineLength - $firstLineOffset;
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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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return implode("\r\n", $lines);
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}
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}
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