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