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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 <string>
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/scoped_vector.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"
class GURL;
namespace net {
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(scoped_ptr<WebSocketStream> stream,
WebSocketDeflater::ContextTakeOverMode mode,
scoped_ptr<WebSocketDeflatePredictor> predictor);
virtual ~WebSocketDeflateStream();
// WebSocketStream functions.
virtual int ReadFrames(ScopedVector<WebSocketFrame>* frames,
const CompletionCallback& callback) OVERRIDE;
virtual int WriteFrames(ScopedVector<WebSocketFrame>* frames,
const CompletionCallback& callback) OVERRIDE;
virtual void Close() OVERRIDE;
virtual std::string GetSubProtocol() const OVERRIDE;
virtual 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,
};
void OnReadComplete(ScopedVector<WebSocketFrame>* frames,
const CompletionCallback& callback,
int result);
// This function deflates |frames| and stores the result to |frames| itself.
int Deflate(ScopedVector<WebSocketFrame>* frames);
void OnMessageStart(const ScopedVector<WebSocketFrame>& frames, size_t index);
int AppendCompressedFrame(const WebSocketFrameHeader& header,
ScopedVector<WebSocketFrame>* frames_to_write);
int AppendPossiblyCompressedMessage(
ScopedVector<WebSocketFrame>* frames,
ScopedVector<WebSocketFrame>* frames_to_write);
// This function inflates |frames| and stores the result to |frames| itself.
int Inflate(ScopedVector<WebSocketFrame>* frames);
int InflateAndReadIfNecessary(ScopedVector<WebSocketFrame>* frames,
const CompletionCallback& callback);
const scoped_ptr<WebSocketStream> stream_;
WebSocketDeflater deflater_;
WebSocketInflater inflater_;
ReadingState reading_state_;
WritingState writing_state_;
WebSocketFrameHeader::OpCode current_reading_opcode_;
WebSocketFrameHeader::OpCode current_writing_opcode_;
scoped_ptr<WebSocketDeflatePredictor> predictor_;
DISALLOW_COPY_AND_ASSIGN(WebSocketDeflateStream);
};
} // namespace net
#endif // NET_WEBSOCKETS_WEBSOCKET_DEFLATE_STREAM_H_
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