Split net/spdy into core and chromium subdirectories.

net/spdy/spdy_buffer.h

-// Copyright (c) 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_SPDY_SPDY_BUFFER_H_
-#define NET_SPDY_SPDY_BUFFER_H_
-
-#include <cstddef>
-#include <memory>
-#include <vector>
-
-#include "base/callback_forward.h"
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "net/base/net_export.h"
-
-namespace net {
-
-class IOBuffer;
-class SpdySerializedFrame;
-
-// SpdyBuffer is a class to hold data read from or to be written to a
-// SPDY connection. It is similar to a DrainableIOBuffer but is not
-// ref-counted and will include a way to get notified when Consume()
-// is called.
-//
-// NOTE(akalin): This explicitly does not inherit from IOBuffer to
-// avoid the needless ref-counting and to avoid working around the
-// fact that IOBuffer member functions are not virtual.
-class NET_EXPORT_PRIVATE SpdyBuffer {
- public:
-  // The source of a call to a ConsumeCallback.
-  enum ConsumeSource {
-    // Called via a call to Consume().
-    CONSUME,
-    // Called via the SpdyBuffer being destroyed.
-    DISCARD
-  };
-
-  // A Callback that gets called when bytes are consumed with the
-  // (non-zero) number of bytes consumed and the source of the
-  // consume. May be called any number of times with CONSUME as the
-  // source followed by at most one call with DISCARD as the
-  // source. The sum of the number of bytes consumed equals the total
-  // size of the buffer.
-  typedef base::Callback<void(size_t, ConsumeSource)> ConsumeCallback;
-
-  // Construct with the data in the given frame. Assumes that data is
-  // owned by |frame| or outlives it.
-  explicit SpdyBuffer(std::unique_ptr<SpdySerializedFrame> frame);
-
-  // Construct with a copy of the given raw data. |data| must be
-  // non-NULL and |size| must be non-zero.
-  SpdyBuffer(const char* data, size_t size);
-
-  // If there are bytes remaining in the buffer, triggers a call to
-  // any consume callbacks with a DISCARD source.
-  ~SpdyBuffer();
-
-  // Returns the remaining (unconsumed) data.
-  const char* GetRemainingData() const;
-
-  // Returns the number of remaining (unconsumed) bytes.
-  size_t GetRemainingSize() const;
-
-  // Add a callback to be called when bytes are consumed. The
-  // ConsumeCallback should not do anything complicated; ideally it
-  // should only update a counter. In particular, it must *not* cause
-  // the SpdyBuffer itself to be destroyed.
-  void AddConsumeCallback(const ConsumeCallback& consume_callback);
-
-  // Consume the given number of bytes, which must be positive but not
-  // greater than GetRemainingSize().
-  void Consume(size_t consume_size);
-
-  // Returns an IOBuffer pointing to the data starting at
-  // GetRemainingData(). Use with care; the returned IOBuffer is not
-  // updated when Consume() is called. However, it may still be used
-  // past the lifetime of this object.
-  //
-  // This is used with Socket::Write(), which takes an IOBuffer* that
-  // may be written to even after the socket itself is destroyed. (See
-  // http://crbug.com/249725 .)
-  IOBuffer* GetIOBufferForRemainingData();
-
-  // Returns the estimate of dynamically allocated memory in bytes.
-  size_t EstimateMemoryUsage() const;
-
- private:
-  void ConsumeHelper(size_t consume_size, ConsumeSource consume_source);
-
-  // Ref-count the passed-in SpdySerializedFrame to support the semantics of
-  // |GetIOBufferForRemainingData()|.
-  typedef base::RefCountedData<std::unique_ptr<SpdySerializedFrame>>
-      SharedFrame;
-
-  class SharedFrameIOBuffer;
-
-  const scoped_refptr<SharedFrame> shared_frame_;
-  std::vector<ConsumeCallback> consume_callbacks_;
-  size_t offset_;
-
-  DISALLOW_COPY_AND_ASSIGN(SpdyBuffer);
-};
-
-}  // namespace net
-
-#endif  // NET_SPDY_SPDY_BUFFER_H_