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diff --git a/testing/mochitest/pywebsocket3/mod_pywebsocket/memorizingfile.py b/testing/mochitest/pywebsocket3/mod_pywebsocket/memorizingfile.py
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+++ b/testing/mochitest/pywebsocket3/mod_pywebsocket/memorizingfile.py
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+#!/usr/bin/env python
+#
+# Copyright 2011, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+"""Memorizing file.
+
+A memorizing file wraps a file and memorizes lines read by readline.
+"""
+
+from __future__ import absolute_import
+import sys
+
+
+class MemorizingFile(object):
+    """MemorizingFile wraps a file and memorizes lines read by readline.
+
+    Note that data read by other methods are not memorized. This behavior
+    is good enough for memorizing lines SimpleHTTPServer reads before
+    the control reaches WebSocketRequestHandler.
+    """
+    def __init__(self, file_, max_memorized_lines=sys.maxsize):
+        """Construct an instance.
+
+        Args:
+            file_: the file object to wrap.
+            max_memorized_lines: the maximum number of lines to memorize.
+                Only the first max_memorized_lines are memorized.
+                Default: sys.maxint.
+        """
+        self._file = file_
+        self._memorized_lines = []
+        self._max_memorized_lines = max_memorized_lines
+        self._buffered = False
+        self._buffered_line = None
+
+    def __getattribute__(self, name):
+        """Return a file attribute.
+        
+        Returns the value overridden by this class for some attributes,
+        and forwards the call to _file for the other attributes.
+        """
+        if name in ('_file', '_memorized_lines', '_max_memorized_lines',
+                    '_buffered', '_buffered_line', 'readline',
+                    'get_memorized_lines'):
+            return object.__getattribute__(self, name)
+        return self._file.__getattribute__(name)
+
+    def readline(self, size=-1):
+        """Override file.readline and memorize the line read.
+
+        Note that even if size is specified and smaller than actual size,
+        the whole line will be read out from underlying file object by
+        subsequent readline calls.
+        """
+        if self._buffered:
+            line = self._buffered_line
+            self._buffered = False
+        else:
+            line = self._file.readline()
+            if line and len(self._memorized_lines) < self._max_memorized_lines:
+                self._memorized_lines.append(line)
+        if size >= 0 and size < len(line):
+            self._buffered = True
+            self._buffered_line = line[size:]
+            return line[:size]
+        return line
+
+    def get_memorized_lines(self):
+        """Get lines memorized so far."""
+        return self._memorized_lines
+
+
+# vi:sts=4 sw=4 et