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 /**

    13  * Handles Base 64 Transfer Encoding in Swift Mailer.

    14  * @package Swift

    15  * @subpackage Mime

    16  * @author Chris Corbyn

    17  */

    18 class Swift_Mime_ContentEncoder_Base64ContentEncoder

    19   extends Swift_Encoder_Base64Encoder

    20   implements Swift_Mime_ContentEncoder

    21 {

    22   

    23   /**

    24    * Encode stream $in to stream $out.

    25    * @param Swift_OutputByteStream $in

    26    * @param Swift_InputByteStream $out

    27    * @param int $firstLineOffset

    28    * @param int $maxLineLength, optional, 0 indicates the default of 76 bytes

    29    */

    30   public function encodeByteStream(

    31     Swift_OutputByteStream $os, Swift_InputByteStream $is, $firstLineOffset = 0,

    32     $maxLineLength = 0)

    33   {

    34     if (0 >= $maxLineLength || 76 < $maxLineLength)

    35     {

    36       $maxLineLength = 76;

    37     }

    38     

    39     $remainder = 0;

    40     

    41     while (false !== $bytes = $os->read(8190))

    42     {

    43       $encoded = base64_encode($bytes);

    44       $encodedTransformed = '';

    45       $thisMaxLineLength = $maxLineLength - $remainder - $firstLineOffset;

    46       

    47       while ($thisMaxLineLength < strlen($encoded))

    48       {

    49         $encodedTransformed .= substr($encoded, 0, $thisMaxLineLength) . "\r\n";

    50         $firstLineOffset = 0;

    51         $encoded = substr($encoded, $thisMaxLineLength);

    52         $thisMaxLineLength = $maxLineLength;

    53         $remainder = 0;

    54       }

    55       

    56       if (0 < $remainingLength = strlen($encoded))

    57       {

    58         $remainder += $remainingLength;

    59         $encodedTransformed .= $encoded;

    60         $encoded = null;

    61       }

    62       

    63       $is->write($encodedTransformed);

    64     }

    65   }

    66   

    67   /**

    68    * Get the name of this encoding scheme.

    69    * Returns the string 'base64'.

    70    * @return string

    71    */

    72   public function getName()

    73   {

    74     return 'base64';

    75   }

    76   

    77 }