Rfc2231Encoder.php

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<?php

/*
 * This file is part of SwiftMailer.
 * (c) 2004-2009 Chris Corbyn
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

//@require 'Swift/Encoder.php';
//@require 'Swift/CharacterStream.php';

class Swift_Encoder_Rfc2231Encoder implements Swift_Encoder
{
  
  private $_charStream;
  
  public function __construct(Swift_CharacterStream $charStream)
  {
    $this->_charStream = $charStream;
  }
  
  public function encodeString($string, $firstLineOffset = 0,
    $maxLineLength = 0)
  {
    $lines = array(); $lineCount = 0;
    $lines[] = '';
    $currentLine =& $lines[$lineCount++];
    
    if (0 >= $maxLineLength)
    {
      $maxLineLength = 75;
    }
    
    $this->_charStream->flushContents();
    $this->_charStream->importString($string);
    
    $thisLineLength = $maxLineLength - $firstLineOffset;
    
    while (false !== $char = $this->_charStream->read(4))
    {
      $encodedChar = rawurlencode($char);
      if (0 != strlen($currentLine)
        && strlen($currentLine . $encodedChar) > $thisLineLength)
      {
        $lines[] = '';
        $currentLine =& $lines[$lineCount++];
        $thisLineLength = $maxLineLength;
      }
      $currentLine .= $encodedChar;
    }
    
    return implode("\r\n", $lines);
  }
  
  public function charsetChanged($charset)
  {
    $this->_charStream->setCharacterSet($charset);
  }
  
}