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 Encoding in Swift Mailer.

    14  * @package Swift

    15  * @subpackage Encoder

    16  * @author Chris Corbyn

    17  */

    18 class Swift_Encoder_Base64Encoder implements Swift_Encoder

    19 {

    20   

    21   /**

    22    * Takes an unencoded string and produces a Base64 encoded string from it.

    23    * Base64 encoded strings have a maximum line length of 76 characters.

    24    * If the first line needs to be shorter, indicate the difference with

    25    * $firstLineOffset.

    26    * @param string $string to encode

    27    * @param int $firstLineOffset

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

    29    * @return string

    30    */

    31   public function encodeString($string, $firstLineOffset = 0,

    32     $maxLineLength = 0)

    33   {

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

    35     {

    36       $maxLineLength = 76;

    37     }

    38     

    39     $encodedString = base64_encode($string);

    40     $firstLine = '';

    41     

    42     if (0 != $firstLineOffset)

    43     {

    44       $firstLine = substr(

    45         $encodedString, 0, $maxLineLength - $firstLineOffset

    46         ) . "\r\n";

    47       $encodedString = substr(

    48         $encodedString, $maxLineLength - $firstLineOffset

    49         );

    50     }

    51     

    52     return $firstLine . trim(chunk_split($encodedString, $maxLineLength, "\r\n"));

    53   }

    54   

    55   /**

    56    * Does nothing.

    57    */

    58   public function charsetChanged($charset)

    59   {

    60   }

    61   

    62 }