/framework/vendor/swift/lib/classes/Swift/Encoder/Rfc2231Encoder.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//@require 'Swift/CharacterStream.php';
13
14/**
15 * Handles RFC 2231 specified Encoding in Swift Mailer.
16 * @package Swift
17 * @subpackage Encoder
18 * @author Chris Corbyn
19 */
20class Swift_Encoder_Rfc2231Encoder implements Swift_Encoder
21{
22  
23  /**
24   * A character stream to use when reading a string as characters instead of bytes.
25   * @var Swift_CharacterStream
26   * @access private
27   */
28  private $_charStream;
29  
30  /**
31   * Creates a new Rfc2231Encoder using the given character stream instance.
32   * @param Swift_CharacterStream
33   */
34  public function __construct(Swift_CharacterStream $charStream)
35  {
36    $this->_charStream = $charStream;
37  }
38  
39  /**
40   * Takes an unencoded string and produces a string encoded according to
41   * RFC 2231 from it.
42   * @param string $string to encode
43   * @param int $firstLineOffset
44   * @param int $maxLineLength, optional, 0 indicates the default of 75 bytes
45   * @return string
46   */
47  public function encodeString($string, $firstLineOffset = 0,
48    $maxLineLength = 0)
49  {
50    $lines = array(); $lineCount = 0;
51    $lines[] = '';
52    $currentLine =& $lines[$lineCount++];
53    
54    if (0 >= $maxLineLength)
55    {
56      $maxLineLength = 75;
57    }
58    
59    $this->_charStream->flushContents();
60    $this->_charStream->importString($string);
61    
62    $thisLineLength = $maxLineLength - $firstLineOffset;
63    
64    while (false !== $char = $this->_charStream->read(4))
65    {
66      $encodedChar = rawurlencode($char);
67      if (0 != strlen($currentLine)
68        && strlen($currentLine . $encodedChar) > $thisLineLength)
69      {
70        $lines[] = '';
71        $currentLine =& $lines[$lineCount++];
72        $thisLineLength = $maxLineLength;
73      }
74      $currentLine .= $encodedChar;
75    }
76    
77    return implode("\r\n", $lines);
78  }
79  
80  /**
81   * Updates the charset used.
82   * @param string $charset
83   */
84  public function charsetChanged($charset)
85  {
86    $this->_charStream->setCharacterSet($charset);
87  }
88  
89}