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diff --git a/h-source/External/swiftmailer/lib/classes/Swift/InputByteStream.php b/h-source/External/swiftmailer/lib/classes/Swift/InputByteStream.php
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@@ -0,0 +1,72 @@
+<?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.
+ */
+
+/**
+ * An abstract means of writing data.
+ * Classes implementing this interface may use a subsystem which requires less
+ * memory than working with large strings of data.
+ * @package Swift
+ * @subpackage ByteStream
+ * @author Chris Corbyn
+ */
+interface Swift_InputByteStream
+{
+  
+  /**
+   * Writes $bytes to the end of the stream.
+   * 
+   * Writing may not happen immediately if the stream chooses to buffer.  If
+   * you want to write these bytes with immediate effect, call {@link commit()}
+   * after calling write().
+   * 
+   * This method returns the sequence ID of the write (i.e. 1 for first, 2 for
+   * second, etc etc).
+   *
+   * @param string $bytes
+   * @return int
+   * @throws Swift_IoException
+   */
+  public function write($bytes);
+  
+  /**
+   * For any bytes that are currently buffered inside the stream, force them
+   * off the buffer.
+   * 
+   * @throws Swift_IoException
+   */
+  public function commit();
+  
+  /**
+   * 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);
+  
+  /**
+   * 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);
+  
+  /**
+   * Flush the contents of the stream (empty it) and set the internal pointer
+   * to the beginning.
+   * @throws Swift_IoException
+   */
+  public function flushBuffers();
+  
+}