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// Copyright 2013 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_WEBSOCKETS_WEBSOCKET_DEFLATE_STREAM_H_
#define NET_WEBSOCKETS_WEBSOCKET_DEFLATE_STREAM_H_
#include <stddef.h>
#include <memory>
#include <string>
#include <vector>
#include "base/macros.h"
#include "net/base/completion_callback.h"
#include "net/base/net_export.h"
#include "net/websockets/websocket_deflater.h"
#include "net/websockets/websocket_frame.h"
#include "net/websockets/websocket_inflater.h"
#include "net/websockets/websocket_stream.h"
namespace net {
class WebSocketDeflateParameters;
class WebSocketDeflatePredictor;
// WebSocketDeflateStream is a WebSocketStream subclass.
// WebSocketDeflateStream is for permessage-deflate WebSocket extension[1].
//
// WebSocketDeflateStream::ReadFrames and WriteFrames may change frame
// boundary. In particular, if a control frame is placed in the middle of
// data message frames, the control frame can overtake data frames.
// Say there are frames df1, df2 and cf, df1 and df2 are frames of a
// data message and cf is a control message frame. cf may arrive first and
// data frames may follow cf.
// Note that message boundary will be preserved, i.e. if the last frame of
// a message m1 is read / written before the last frame of a message m2,
// WebSocketDeflateStream will respect the order.
//
// [1]: http://tools.ietf.org/html/draft-ietf-hybi-permessage-compression-12
class NET_EXPORT_PRIVATE WebSocketDeflateStream : public WebSocketStream {
public:
WebSocketDeflateStream(std::unique_ptr<WebSocketStream> stream,
const WebSocketDeflateParameters& params,
std::unique_ptr<WebSocketDeflatePredictor> predictor);
~WebSocketDeflateStream() override;
// WebSocketStream functions.
int ReadFrames(std::vector<std::unique_ptr<WebSocketFrame>>* frames,
const CompletionCallback& callback) override;
int WriteFrames(std::vector<std::unique_ptr<WebSocketFrame>>* frames,
const CompletionCallback& callback) override;
void Close() override;
std::string GetSubProtocol() const override;
std::string GetExtensions() const override;
private:
enum ReadingState {
READING_COMPRESSED_MESSAGE,
READING_UNCOMPRESSED_MESSAGE,
NOT_READING,
};
enum WritingState {
WRITING_COMPRESSED_MESSAGE,
WRITING_UNCOMPRESSED_MESSAGE,
WRITING_POSSIBLY_COMPRESSED_MESSAGE,
NOT_WRITING,
};
// Handles asynchronous completion of ReadFrames() call on |stream_|.
void OnReadComplete(std::vector<std::unique_ptr<WebSocketFrame>>* frames,
const CompletionCallback& callback,
int result);
// This function deflates |frames| and stores the result to |frames| itself.
int Deflate(std::vector<std::unique_ptr<WebSocketFrame>>* frames);
void OnMessageStart(
const std::vector<std::unique_ptr<WebSocketFrame>>& frames,
size_t index);
int AppendCompressedFrame(
const WebSocketFrameHeader& header,
std::vector<std::unique_ptr<WebSocketFrame>>* frames_to_write);
int AppendPossiblyCompressedMessage(
std::vector<std::unique_ptr<WebSocketFrame>>* frames,
std::vector<std::unique_ptr<WebSocketFrame>>* frames_to_write);
// This function inflates |frames| and stores the result to |frames| itself.
int Inflate(std::vector<std::unique_ptr<WebSocketFrame>>* frames);
int InflateAndReadIfNecessary(
std::vector<std::unique_ptr<WebSocketFrame>>* frames,
const CompletionCallback& callback);
const std::unique_ptr<WebSocketStream> stream_;
WebSocketDeflater deflater_;
WebSocketInflater inflater_;
ReadingState reading_state_;
WritingState writing_state_;
WebSocketFrameHeader::OpCode current_reading_opcode_;
WebSocketFrameHeader::OpCode current_writing_opcode_;
std::unique_ptr<WebSocketDeflatePredictor> predictor_;
DISALLOW_COPY_AND_ASSIGN(WebSocketDeflateStream);
};
} // namespace net
#endif // NET_WEBSOCKETS_WEBSOCKET_DEFLATE_STREAM_H_
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