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diff --git a/External/swiftmailer/lib/classes/Swift/ByteStream/AbstractFilterableInputStream.php b/External/swiftmailer/lib/classes/Swift/ByteStream/AbstractFilterableInputStream.php
new file mode 100755
index 0000000..71bc3f1
--- /dev/null
+++ b/External/swiftmailer/lib/classes/Swift/ByteStream/AbstractFilterableInputStream.php
@@ -0,0 +1,178 @@
+<?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/InputByteStream.php';
+//@require 'Swift/Filterable.php';
+//@require 'Swift/StreamFilter.php';
+
+/**
+ * Provides the base functionality for an InputStream supporting filters.
+ * @package Swift
+ * @subpackage ByteStream
+ * @author Chris Corbyn
+ */
+abstract class Swift_ByteStream_AbstractFilterableInputStream
+  implements Swift_InputByteStream, Swift_Filterable
+{
+  
+  /** Write sequence */
+  private $_sequence = 0;
+  
+  /** StreamFilters */
+  private $_filters = array();
+  
+  /** A buffer for writing */
+  private $_writeBuffer = '';
+  
+  /** Bound streams */
+  private $_mirrors = array();
+  
+  /**
+   * Commit the given bytes to the storage medium immediately.
+   * @param string $bytes
+   * @access protected
+   */
+  abstract protected function _commit($bytes);
+  
+  /**
+   * Flush any buffers/content with immediate effect.
+   * @access protected
+   */
+  abstract protected function _flush();
+  
+  /**
+   * Add a StreamFilter to this InputByteStream.
+   * @param Swift_StreamFilter $filter
+   * @param string $key
+   */
+  public function addFilter(Swift_StreamFilter $filter, $key)
+  {
+    $this->_filters[$key] = $filter;
+  }
+  
+  /**
+   * Remove an already present StreamFilter based on its $key.
+   * @param string $key
+   */
+  public function removeFilter($key)
+  {
+    unset($this->_filters[$key]);
+  }
+  
+  /**
+   * Writes $bytes to the end of the stream.
+   * @param string $bytes
+   * @throws Swift_IoException
+   */
+  public function write($bytes)
+  {
+    $this->_writeBuffer .= $bytes;
+    foreach ($this->_filters as $filter)
+    {
+      if ($filter->shouldBuffer($this->_writeBuffer))
+      {
+        return;
+      }
+    }
+    $this->_doWrite($this->_writeBuffer);
+    return ++$this->_sequence;
+  }
+  
+  /**
+   * For any bytes that are currently buffered inside the stream, force them
+   * off the buffer.
+   * 
+   * @throws Swift_IoException
+   */
+  public function commit()
+  {
+    $this->_doWrite($this->_writeBuffer);
+  }
+  
+  /**
+   * Attach $is to this stream.
+   * The stream acts as an observer, receiving all data that is written.
+   * All {@link write()} and {@link flushBuffers()} operations will be mirrored.
+   * 
+   * @param Swift_InputByteStream $is
+   */
+  public function bind(Swift_InputByteStream $is)
+  {
+    $this->_mirrors[] = $is;
+  }
+  
+  /**
+   * Remove an already bound stream.
+   * If $is is not bound, no errors will be raised.
+   * If the stream currently has any buffered data it will be written to $is
+   * before unbinding occurs.
+   * 
+   * @param Swift_InputByteStream $is
+   */
+  public function unbind(Swift_InputByteStream $is)
+  {
+    foreach ($this->_mirrors as $k => $stream)
+    {
+      if ($is === $stream)
+      {
+        if ($this->_writeBuffer !== '')
+        {
+          $stream->write($this->_filter($this->_writeBuffer));
+        }
+        unset($this->_mirrors[$k]);
+      }
+    }
+  }
+  
+  /**
+   * Flush the contents of the stream (empty it) and set the internal pointer
+   * to the beginning.
+   * @throws Swift_IoException
+   */
+  public function flushBuffers()
+  {
+    if ($this->_writeBuffer !== '')
+    {
+      $this->_doWrite($this->_writeBuffer);
+    }
+    $this->_flush();
+    
+    foreach ($this->_mirrors as $stream)
+    {
+      $stream->flushBuffers();
+    }
+  }
+  
+  // -- Private methods
+  
+  /** Run $bytes through all filters */
+  private function _filter($bytes)
+  {
+    foreach ($this->_filters as $filter)
+    {
+      $bytes = $filter->filter($bytes);
+    }
+    return $bytes;
+  }
+  
+  /** Just write the bytes to the stream */
+  private function _doWrite($bytes)
+  {
+    $this->_commit($this->_filter($bytes));
+    
+    foreach ($this->_mirrors as $stream)
+    {
+      $stream->write($bytes);
+    }
+    
+    $this->_writeBuffer = '';
+  }
+  
+}