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41 lines
1.3 KiB
41 lines
1.3 KiB
<?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 Chris Corbyn
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*/
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class Base64Encoder implements EncoderInterface
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{
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/**
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* Takes an unencoded string and produces a Base64 encoded string from it.
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*
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* Base64 encoded strings have a maximum line length of 76 characters.
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* If the first line needs to be shorter, indicate the difference with
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* $firstLineOffset.
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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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if (0 >= $maxLineLength || 76 < $maxLineLength) {
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$maxLineLength = 76;
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}
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$encodedString = base64_encode($string);
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$firstLine = '';
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if (0 !== $firstLineOffset) {
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$firstLine = substr($encodedString, 0, $maxLineLength - $firstLineOffset)."\r\n";
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$encodedString = substr($encodedString, $maxLineLength - $firstLineOffset);
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}
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return $firstLine.trim(chunk_split($encodedString, $maxLineLength, "\r\n"));
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}
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}
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