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 RFC 2231 specified Encoding in Swift Mailer.

    14  * @package Swift

    15  * @subpackage Encoder

    16  * @author Chris Corbyn

    17  */

    18 class Swift_Encoder_Rfc2231Encoder implements Swift_Encoder

    19 {

    20   

    21   /**

    22    * A character stream to use when reading a string as characters instead of bytes.

    23    * @var Swift_CharacterStream

    24    * @access private

    25    */

    26   private $_charStream;

    27   

    28   /**

    29    * Creates a new Rfc2231Encoder using the given character stream instance.

    30    * @param Swift_CharacterStream

    31    */

    32   public function __construct(Swift_CharacterStream $charStream)

    33   {

    34     $this->_charStream = $charStream;

    35   }

    36   

    37   /**

    38    * Takes an unencoded string and produces a string encoded according to

    39    * RFC 2231 from it.

    40    * @param string $string to encode

    41    * @param int $firstLineOffset

    42    * @param int $maxLineLength, optional, 0 indicates the default of 75 bytes

    43    * @return string

    44    */

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

    46     $maxLineLength = 0)

    47   {

    48     $lines = array(); $lineCount = 0;

    49     $lines[] = '';

    50     $currentLine =& $lines[$lineCount++];

    51     

    52     if (0 >= $maxLineLength)

    53     {

    54       $maxLineLength = 75;

    55     }

    56     

    57     $this->_charStream->flushContents();

    58     $this->_charStream->importString($string);

    59     

    60     $thisLineLength = $maxLineLength - $firstLineOffset;

    61     

    62     while (false !== $char = $this->_charStream->read(4))

    63     {

    64       $encodedChar = rawurlencode($char);

    65       if (0 != strlen($currentLine)

    66         && strlen($currentLine . $encodedChar) > $thisLineLength)

    67       {

    68         $lines[] = '';

    69         $currentLine =& $lines[$lineCount++];

    70         $thisLineLength = $maxLineLength;

    71       }

    72       $currentLine .= $encodedChar;

    73     }

    74     

    75     return implode("\r\n", $lines);

    76   }

    77   

    78   /**

    79    * Updates the charset used.

    80    * @param string $charset

    81    */

    82   public function charsetChanged($charset)

    83   {

    84     $this->_charStream->setCharacterSet($charset);

    85   }

    86   

    87 }