/framework/vendor/swift/lib/classes/Swift/Encoder/Base64Encoder.php

 1<?php
 2
 3/*
 4 * This file is part of SwiftMailer.
 5 * (c) 2004-2009 Chris Corbyn
 6 *
 7 * For the full copyright and license information, please view the LICENSE
 8 * file that was distributed with this source code.
 9 */
10
11//@require 'Swift/Encoder.php';
12
13/**
14 * Handles Base 64 Encoding in Swift Mailer.
15 * @package Swift
16 * @subpackage Encoder
17 * @author Chris Corbyn
18 */
19class Swift_Encoder_Base64Encoder implements Swift_Encoder
20{
21  
22  /**
23   * Takes an unencoded string and produces a Base64 encoded string from it.
24   * Base64 encoded strings have a maximum line length of 76 characters.
25   * If the first line needs to be shorter, indicate the difference with
26   * $firstLineOffset.
27   * @param string $string to encode
28   * @param int $firstLineOffset
29   * @param int $maxLineLength, optional, 0 indicates the default of 76 bytes
30   * @return string
31   */
32  public function encodeString($string, $firstLineOffset = 0,
33    $maxLineLength = 0)
34  {
35    if (0 >= $maxLineLength || 76 < $maxLineLength)
36    {
37      $maxLineLength = 76;
38    }
39    
40    $encodedString = base64_encode($string);
41    $firstLine = '';
42    
43    if (0 != $firstLineOffset)
44    {
45      $firstLine = substr(
46        $encodedString, 0, $maxLineLength - $firstLineOffset
47        ) . "\r\n";
48      $encodedString = substr(
49        $encodedString, $maxLineLength - $firstLineOffset
50        );
51    }
52    
53    return $firstLine . trim(chunk_split($encodedString, $maxLineLength, "\r\n"));
54  }
55  
56  /**
57   * Does nothing.
58   */
59  public function charsetChanged($charset)
60  {
61  }
62  
63}