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<?php

/*
 Handles RFC 2231 specified Encoding in Swift Mailer.
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.
 
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 */

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

/**
 * Handles RFC 2231 specified Encoding in Swift Mailer.
 *
 * @author Chris Corbyn
 */
class Swift_Encoder_Rfc2231Encoder implements Swift_Encoder
{
    /**
   * A character stream to use when reading a string as characters instead of bytes.
   *
   * @var Swift_CharacterStream
   */
  private $_charStream;

/**
   * Creates a new Rfc2231Encoder using the given character stream instance.
   *
   * @param Swift_CharacterStream
   */
  public function __construct(Swift_CharacterStream $charStream)
  {
      $this->_charStream = $charStream;
  }

/**
   * Takes an unencoded string and produces a string encoded according to
   * RFC 2231 from it.
   *
   * @param string $string to encode
   * @param int $firstLineOffset
   * @param int $maxLineLength, optional, 0 indicates the default of 75 bytes
   *
   * @return string
   */
  public function encodeString($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);
  }

/**
   * Updates the charset used.
   *
   * @param string $charset
   */
  public function charsetChanged($charset)
  {
      $this->_charStream->setCharacterSet($charset);
  }
}

[+] ..
[-] QpEncoder.php [edit]
[-] Rfc2231Encoder.php [edit]
[-] Base64Encoder.php [edit]