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Editing: Part.php

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<?php

/**
 * Swift Mailer Message MIME Part
 * Please read the LICENSE file
 * @copyright Chris Corbyn <chris@w3style.co.uk>
 * @author Chris Corbyn <chris@w3style.co.uk>
 * @package Swift_Message
 * @license GNU Lesser General Public License
 */

require_once dirname(__FILE__) . "/../ClassLoader.php";
Swift_ClassLoader::load("Swift_Message_Mime");

/**
 * MIME Part body component for Swift Mailer
 * @package Swift_Message
 * @author Chris Corbyn <chris@w3style.co.uk>
 */
class Swift_Message_Part extends Swift_Message_Mime
{
  /**
   * Constructor
   * @param mixed The data to use in the body
   * @param string Mime type
   * @param string The encoding format used
   * @param string The charset used
   */
  function Swift_Message_Part($data=null, $type="text/plain", $encoding=null, $charset=null)
  {
    $this->Swift_Message_Mime();
    
    $this->setContentType($type);
    $this->setEncoding($encoding);
    $this->setCharset($charset);
    $this->setFlowed(false);
    
    if ($data !== null)
    {
      $this->setData($data);
      /*if ($charset === null)
      {
        if (is_string($data) && $this->_encoder->isUTF8($data)) $this->setCharset("utf-8");
        else $this->setCharset("iso-8859-1"); //The likely encoding
      }*/
    }
  }
  /**
   * Get the level in the MIME hierarchy at which this section should appear.
   * @return string
   */
  function getLevel()
  {
    return SWIFT_MIME_LEVEL_ALTERNATIVE;
  }
  /**
   * Alias for setData()
   * @param mixed Body
   */
  function setBody($body)
  {
    $this->setData($body);
  }
  /**
   * Alias for getData()
   * @return mixed The document body
   */
  function &getBody()
  {
    $data =& $this->getData();
    return $data;
  }
  /**
   * Set the charset of the document
   * @param string The charset used
   */
  function setCharset($charset)
  {
    $this->headers->setAttribute("Content-Type", "charset", $charset);
    if (($this->getEncoding() == "7bit") && (strtolower($charset) == "utf-8" || strtolower($charset) == "utf8")) $this->setEncoding("8bit");
  }
  /**
   * Get the charset used in the document
   * Returns null if none is set
   * @return string
   */
  function getCharset()
  {
    if ($this->headers->hasAttribute("Content-Type", "charset"))
    {
      return $this->headers->getAttribute("Content-Type", "charset");
    }
    else
    {
      return null;
    }
  }
  /**
   * Set the "format" attribute to flowed
   * @param boolean On or Off
   */
  function setFlowed($flowed=true)
  {
    $value = null;
    if ($flowed) $value = "flowed";
    $this->headers->setAttribute("Content-Type", "format", $value);
  }
  /**
   * Pre-compilation logic
   */
  function preBuild()
  {
    if (!($enc = $this->getEncoding())) $this->setEncoding("8bit");
    $data =& $this->getData();
    if ($this->getCharset() === null && !$this->numChildren())
    {
      if (is_string($data) && $this->_encoder->isUTF8($data))
      {
        $this->setCharset("utf-8");
      }
      elseif (is_string($data) && $this->_encoder->is7BitAscii($data))
      {
        $this->setCharset("us-ascii");
        if (!$enc) $this->setEncoding("7bit");
      }
      else $this->setCharset("iso-8859-1");
    }
    elseif ($this->numChildren())
    {
      $this->setCharset(null);
      $this->setEncoding("7bit");
    }
  }
}

Editing: Part.php

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