[WebSocket] Add tests for permessage deflate split frames.

LayoutTests/http/tests/websocket/permessage-deflate-split-frames_wsh.py

+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+
+from mod_pywebsocket import common
+from mod_pywebsocket.extensions import PerMessageDeflateExtensionProcessor
+from mod_pywebsocket.stream import create_header
+
+
+def _get_permessage_deflate_extension_processor(request):
+    for extension_processor in request.ws_extension_processors:
+        if isinstance(extension_processor,
+                      PerMessageDeflateExtensionProcessor):
+            return extension_processor
+    return None
+
+
+def web_socket_do_extra_handshake(request):
+    processor = _get_permessage_deflate_extension_processor(request)
+    assert processor is not None
+    # Remove extension processors other than
+    # PerMessageDeflateExtensionProcessor to avoid conflict.
+    request.ws_extension_processors = [processor]
+
+
+def web_socket_transfer_data(request):
+    line = request.ws_stream.receive_message()
+    # Hello
+    payload = b'\xf2\x48\xcd\xc9\xc9\x07\x00\x00\x00\xff\xff'
+    # Strip \x00\x00\xff\xff
+    stripped = payload[:-4]
+
+    header = create_header(common.OPCODE_TEXT, len(payload),
+        fin=0, rsv1=1, rsv2=0, rsv3=0, mask=False)
+    request.ws_stream._write(header + payload)
+
+    header = create_header(common.OPCODE_CONTINUATION, len(stripped),
+        fin=1, rsv1=0, rsv2=0, rsv3=0, mask=False)
+    request.ws_stream._write(header + stripped)
+
+
+# vi:sts=4 sw=4 et