[SPDY] Replace SpdyIOBuffer with new SpdyBuffer class

net/spdy/spdy_read_queue.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_QUEUE_H_
+#define NET_SPDY_SPDY_BUFFER_QUEUE_H_
+
+#include <cstddef>
+#include <deque>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "net/base/net_export.h"
+
+namespace net {
+
+class SpdyBuffer;
+
+// A FIFO queue of incoming data from a SPDY connection. Useful for
+// SpdyStream delegates.
+class NET_EXPORT_PRIVATE SpdyReadQueue {
+ public:
+  SpdyReadQueue();
+  ~SpdyReadQueue();
+
+  // Returns whether there's anything in the queue.
+  bool IsEmpty() const;
+
+  // Returns the total number of bytes in the queue.
+  size_t GetTotalSize() const;
+
+  // Enqueues the bytes in |buffer|.
+  void Enqueue(scoped_ptr<SpdyBuffer> buffer);
+
+  // Dequeues up to |len| (which must be positive) bytes into
+  // |out|. Returns the number of bytes dequeued.
+  size_t Dequeue(char* out, size_t len);
+
+  // Removes all bytes from the queue.
+  void Clear();
+
+ private:
+  std::deque<SpdyBuffer*> queue_;
+  size_t total_size_;
+
+  DISALLOW_COPY_AND_ASSIGN(SpdyReadQueue);
+};
+
+}  // namespace net
+
+#endif  // NET_SPDY_SPDY_BUFFER_QUEUE_H_