<?php
/*
* This file is part of SwiftMailer.
* (c) 2004-2009 Chris Corbyn
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
/**
* Handles Base 64 Encoding in Swift Mailer.
*
* @author Chris Corbyn
*/
class Swift_Encoder_Base64Encoder implements Swift_Encoder
{
/**
* Takes an unencoded string and produces a Base64 encoded string from it.
*
* Base64 encoded strings have a maximum line length of 76 characters.
* If the first line needs to be shorter, indicate the difference with
* $firstLineOffset.
*
* @param string $string to encode
* @param int $firstLineOffset
* @param int $maxLineLength optional, 0 indicates the default of 76 bytes
*
* @return string
*/
public function encodeString($string, $firstLineOffset = 0, $maxLineLength = 0)
{
if (0 >= $maxLineLength || 76 < $maxLineLength) {
$maxLineLength = 76;
}
$encodedString = base64_encode($string);
$firstLine = '';
if (0 != $firstLineOffset) {
$firstLine = substr(
$encodedString, 0, $maxLineLength - $firstLineOffset
)."\r\n";
$encodedString = substr(
$encodedString, $maxLineLength - $firstLineOffset
);
}
return $firstLine.trim(chunk_split($encodedString, $maxLineLength, "\r\n"));
}
/**
* Does nothing.
*/
public function charsetChanged($charset)
{
}
}