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// 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.
#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:
explicit WebSocketEncoder(bool is_server);
WebSocketEncoder(bool is_server,
int deflate_bits,
int inflate_bits,
bool no_context_takeover);
// Parses a value in the Sec-WebSocket-Extensions header. If it contains a
// single element of the permessage-deflate extension, stores the result of
// parsing the parameters of the extension into the given variables.
// Otherwise, returns with *deflate set to false.
//
// - If the client_max_window_bits parameter is missing, *client_window_bits
// defaults to 15.
// - If the client_max_window_bits parameter has an invalid value,
// *client_window_bits will be set to 0.
// - If the server_max_window_bits parameter is missing, *server_window_bits
// defaults to 15.
// - If the server_max_window_bits parameter has an invalid value,
// *client_window_bits will be set to 0.
//
// TODO(tyoshino): Consider using a struct than taking a lot of pointers for
// output.
static void ParseExtensions(const std::string& header_value,
bool* deflate,
bool* has_client_window_bits,
int* client_window_bits,
int* server_window_bits,
bool* client_no_context_takeover,
bool* server_no_context_takeover);
bool Inflate(std::string* message);
bool 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_
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