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 Base 64 Transfer Encoding in Swift Mailer.
13:  * @package Swift
14:  * @subpackage Mime
15:  * @author Chris Corbyn
16:  */
17: class Swift_Mime_ContentEncoder_Base64ContentEncoder extends Swift_Encoder_Base64Encoder implements Swift_Mime_ContentEncoder
18: {
19:     /**
20:      * Encode stream $in to stream $out.
21:      * @param Swift_OutputByteStream $in
22:      * @param Swift_InputByteStream  $out
23:      * @param int                    $firstLineOffset
24:      * @param int                    $maxLineLength,  optional, 0 indicates the default of 76 bytes
25:      */
26:     public function encodeByteStream(Swift_OutputByteStream $os, Swift_InputByteStream $is, $firstLineOffset = 0, $maxLineLength = 0)
27:     {
28:         if (0 >= $maxLineLength || 76 < $maxLineLength) {
29:             $maxLineLength = 76;
30:         }
31: 
32:         $remainder = 0;
33: 
34:         while (false !== $bytes = $os->read(8190)) {
35:             $encoded = base64_encode($bytes);
36:             $encodedTransformed = '';
37:             $thisMaxLineLength = $maxLineLength - $remainder - $firstLineOffset;
38: 
39:             while ($thisMaxLineLength < strlen($encoded)) {
40:                 $encodedTransformed .= substr($encoded, 0, $thisMaxLineLength) . "\r\n";
41:                 $firstLineOffset = 0;
42:                 $encoded = substr($encoded, $thisMaxLineLength);
43:                 $thisMaxLineLength = $maxLineLength;
44:                 $remainder = 0;
45:             }
46: 
47:             if (0 < $remainingLength = strlen($encoded)) {
48:                 $remainder += $remainingLength;
49:                 $encodedTransformed .= $encoded;
50:                 $encoded = null;
51:             }
52: 
53:             $is->write($encodedTransformed);
54:         }
55:     }
56: 
57:     /**
58:      * Get the name of this encoding scheme.
59:      * Returns the string 'base64'.
60:      * @return string
61:      */
62:     public function getName()
63:     {
64:         return 'base64';
65:     }
66: }
67: