Support WebSocket per-message deflate extension in http server.

net/server/web_socket_encoder.h

+// Copyright (c) 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.
+
+#ifndef NET_SERVER_WEB_SOCKET_ENCODER_H_
+#define NET_SERVER_WEB_SOCKET_ENCODER_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/strings/string_piece.h"
+#include "net/server/web_socket.h"
+#include "net/websockets/websocket_deflater.h"
+#include "net/websockets/websocket_inflater.h"
+
+namespace net {
+
+class WebSocketEncoder {
+ public:
+  ~WebSocketEncoder();
+
+  static WebSocketEncoder* CreateServer(
+      const std::string& request_extensions,
+      std::string* response_extensions);
+
+  static const char kClientExtensions[];
+  static WebSocketEncoder* CreateClient(
+      const std::string& response_extensions);
+
+  WebSocket::ParseResult DecodeFrame(
+      const base::StringPiece& frame,
+      int* bytes_consumed,
+      std::string* output);
+
+  void EncodeFrame(
+      const std::string& frame,
+      int masking_key,
+      std::string* output);
+
+ private:
+  WebSocketEncoder(bool is_server);
+  WebSocketEncoder(bool is_server, int deflate_bits, int inflate_bits);
+
+  static void ParseExtensions(
+      const std::string& extensions,
+      bool *deflate, int *client_window_bits, int *server_window_bits);
+
+  WebSocket::ParseResult Inflate(std::string* message);
+  WebSocket::ParseResult Deflate(
+      const std::string& message, std::string* output);
+
+  scoped_ptr<WebSocketDeflater> deflater_;
+  scoped_ptr<WebSocketInflater> inflater_;
+  bool is_server_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebSocketEncoder);
+};
+
+}  // namespace net
+
+#endif  // NET_SERVER_WEB_SOCKET_ENCODER_H_