59 lines
1.6 KiB
PHP
59 lines
1.6 KiB
PHP
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<?php
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/*
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* This file is part of SwiftMailer.
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* (c) 2004-2009 Chris Corbyn
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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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* Handles Base 64 Encoding in Swift Mailer.
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*
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* @author Chris Corbyn
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*/
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class Swift_Encoder_Base64Encoder implements Swift_Encoder
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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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* @param string $string to encode
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* @param int $firstLineOffset
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* @param int $maxLineLength optional, 0 indicates the default of 76 bytes
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*
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* @return string
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*/
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public function encodeString($string, $firstLineOffset = 0, $maxLineLength = 0)
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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(
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$encodedString, 0, $maxLineLength - $firstLineOffset
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)."\r\n";
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$encodedString = substr(
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$encodedString, $maxLineLength - $firstLineOffset
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);
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}
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return $firstLine.trim(chunk_split($encodedString, $maxLineLength, "\r\n"));
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}
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/**
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* Does nothing.
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*/
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public function charsetChanged($charset)
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{
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}
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}
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