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<?php

/*
 The standard factory for creating CharacterReaders 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/CharacterReaderFactory.php';

/**
 * Standard factory for creating CharacterReaders.
 *
 * @author Chris Corbyn
 */
class Swift_CharacterReaderFactory_SimpleCharacterReaderFactory
  implements Swift_CharacterReaderFactory
{
    /**
   * A map of charset patterns to their implementation classes.
   *
   * @var array
   */
  private $_map = array();

/**
   * Factories which have already been loaded.
   *
   * @var Swift_CharacterReaderFactory[]
   */
  private $_loaded = array();

/**
   * Creates a new CharacterReaderFactory.
   */
  public function __construct()
  {
      $prefix = 'Swift_CharacterReader_';

$singleByte = array(
      'class' => $prefix.'GenericFixedWidthReader',
      'constructor' => array(1),
      );

$doubleByte = array(
      'class' => $prefix.'GenericFixedWidthReader',
      'constructor' => array(2),
      );

$fourBytes = array(
      'class' => $prefix.'GenericFixedWidthReader',
      'constructor' => array(4),
      );

//Utf-8
    $this->_map['utf-?8'] = array(
      'class' => $prefix.'Utf8Reader',
      'constructor' => array(),
      );

//7-8 bit charsets
    $this->_map['(us-)?ascii'] = $singleByte;
      $this->_map['(iso|iec)-?8859-?[0-9]+'] = $singleByte;
      $this->_map['windows-?125[0-9]'] = $singleByte;
      $this->_map['cp-?[0-9]+'] = $singleByte;
      $this->_map['ansi'] = $singleByte;
      $this->_map['macintosh'] = $singleByte;
      $this->_map['koi-?7'] = $singleByte;
      $this->_map['koi-?8-?.+'] = $singleByte;
      $this->_map['mik'] = $singleByte;
      $this->_map['(cork|t1)'] = $singleByte;
      $this->_map['v?iscii'] = $singleByte;

//16 bits
    $this->_map['(ucs-?2|utf-?16)'] = $doubleByte;

//32 bits
    $this->_map['(ucs-?4|utf-?32)'] = $fourBytes;

//Fallback
    $this->_map['.*'] = $singleByte;
  }

/**
   * Returns a CharacterReader suitable for the charset applied.
   *
   * @param string $charset
   *
   * @return Swift_CharacterReader
   */
  public function getReaderFor($charset)
  {
      $charset = trim(strtolower($charset));
      foreach ($this->_map as $pattern => $spec) {
          $re = '/^'.$pattern.'$/D';
          if (preg_match($re, $charset)) {
              if (!array_key_exists($pattern, $this->_loaded)) {
                  $reflector = new ReflectionClass($spec['class']);
                  if ($reflector->getConstructor()) {
                      $reader = $reflector->newInstanceArgs($spec['constructor']);
                  } else {
                      $reader = $reflector->newInstance();
                  }
                  $this->_loaded[$pattern] = $reader;
              }

return $this->_loaded[$pattern];
          }
      }
  }
}

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[-] SimpleCharacterReaderFactory.php [edit]