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