Revert 165858 - Add QuicStream and friends to QUIC code.

net/quic/quic_stream_sequencer.h

-// Copyright (c) 2012 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_QUIC_QUIC_STREAM_SEQUENCER_H_
-#define NET_QUIC_QUIC_STREAM_SEQUENCER_H_
-
-#include <map>
-
-#include "base/basictypes.h"
-#include "base/memory/scoped_ptr.h"
-#include "net/quic/quic_protocol.h"
-
-using std::map;
-using std::string;
-
-namespace net {
-
-class QuicSession;
-class ReliableQuicStream;
-
-// Buffers frames until we have something which can be passed
-// up to the next layer.
-// TOOD(alyssar) add some checks for overflow attempts [1, 256,] [2, 256]
-class NET_EXPORT_PRIVATE QuicStreamSequencer {
- public:
-  static size_t kMaxUdpPacketSize;
-
-  explicit QuicStreamSequencer(ReliableQuicStream* quic_stream);
-  QuicStreamSequencer(size_t max_frame_memory,
-                      ReliableQuicStream* quic_stream);
-
-  virtual ~QuicStreamSequencer();
-
-  // Returns the expected value of OnStreamFrame for this frame.
-  bool WillAcceptStreamFrame(const QuicStreamFrame& frame) const;
-
-  // If the frame is the next one we need in order to process in-order data,
-  // ProcessData will be immediately called on the stream until all buffered
-  // data is processed or the stream fails to consume data.  Any unconsumed
-  // data will be buffered.
-  //
-  // If the frame is not the next in line, it will either be buffered, and
-  // this will return true, or it will be rejected and this will return false.
-  bool OnStreamFrame(const QuicStreamFrame& frame);
-
-  // Wait until we've seen 'offset' bytes, and then terminate the stream.
-  void CloseStreamAtOffset(QuicStreamOffset offset, bool half_close);
-
-  // Once data is buffered, it's up to the stream to read it when the stream
-  // can handle more data.  The following three functions make that possible.
-
-  // Advances the readable pointer num_bytes bytes, releasing any buffered data
-  // which is no longer in uses
-  void AdvanceReadablePtr(size_t num_bytes);
-
-  // Returns true if the sequncer has bytes available for reading.
-  bool HasBytesToRead();
-
-  // Returns true if the sequencer has delivered a half close.
-  bool IsHalfClosed();
-
-  // Returns true if the sequencer has delivered a full close.
-  bool IsClosed();
-
- private:
-  bool MaybeCloseStream();
-
-  friend class QuicStreamSequencerPeer;
-  // TODO(alyssar) use something better than strings.
-  typedef map<QuicStreamOffset, string> FrameMap;
-
-  void FlushBufferedFrames();
-
-  ReliableQuicStream* stream_;  // The stream which owns this sequencer.
-  QuicStreamOffset num_bytes_consumed_;  // The last data consumed by the stream
-  FrameMap frames_;  // sequence number -> frame
-  size_t max_frame_memory_;  //  the maximum memory the sequencer can buffer.
-  // The offset, if any, we got a stream cancelation for.  When this many bytes
-  // have been processed, the stream will be half or full closed depending on
-  // the half_close_ bool.
-  QuicStreamOffset close_offset_;
-  // Only valid if close_offset_ is set.  Indicates if it's a half or a full
-  // close.
-  bool half_close_;
-};
-
-}  // namespace net
-
-#endif  // NET_QUIC_QUIC_STREAM_SEQUENCER_H_