Break out balsa and epoll_server from net/tools/flip_server.

net/tools/flip_server/simple_buffer.h

-// Copyright (c) 2011 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_TOOLS_FLIP_SERVER_SIMPLE_BUFFER_H__
-#define NET_TOOLS_FLIP_SERVER_SIMPLE_BUFFER_H__
-
-#include <string>
-
-#include "base/compiler_specific.h"
-#include "net/tools/flip_server/buffer_interface.h"
-
-namespace net {
-
-class SimpleBuffer : public BufferInterface {
- public:
-  SimpleBuffer();
-  explicit SimpleBuffer(int size);
-  virtual ~SimpleBuffer();
-
-  std::string str() const;
-
-  typedef char * iterator;
-  typedef const char * const_iterator;
-
-  iterator begin() { return storage_ + read_idx_; }
-  const_iterator begin() const { return storage_ + read_idx_; }
-
-  iterator end() { return storage_ + write_idx_; }
-  const_iterator end() const { return storage_ + write_idx_; }
-
-  // The following functions all override pure virtual functions
-  // in BufferInterface. See buffer_interface.h for a description
-  // of what they do.
-  virtual int ReadableBytes() const OVERRIDE;
-  virtual int BufferSize() const OVERRIDE;
-  virtual int BytesFree() const OVERRIDE;
-
-  virtual bool Empty() const OVERRIDE;
-  virtual bool Full() const OVERRIDE;
-
-  virtual int Write(const char* bytes, int size) OVERRIDE;
-
-  virtual void GetWritablePtr(char **ptr, int* size) const OVERRIDE;
-
-  virtual void GetReadablePtr(char **ptr, int* size) const OVERRIDE;
-
-  virtual int Read(char* bytes, int size) OVERRIDE;
-
-  virtual void Clear() OVERRIDE;
-
-  // This can be an expensive operation: costing a new/delete, and copying of
-  // all existing data. Even if the existing buffer does not need to be
-  // resized, unread data may still need to be non-destructively copied to
-  // consolidate fragmented free space.
-  virtual bool Reserve(int size) OVERRIDE;
-
-  virtual void AdvanceReadablePtr(int amount_to_advance) OVERRIDE;
-
-  virtual void AdvanceWritablePtr(int amount_to_advance) OVERRIDE;
-
-  void Swap(SimpleBuffer* other) {
-    char* tmp = storage_;
-    storage_ = other->storage_;
-    other->storage_ = tmp;
-
-    int tmp_int = write_idx_;
-    write_idx_ = other->write_idx_;
-    other->write_idx_ = tmp_int;
-
-    tmp_int = read_idx_;
-    read_idx_ = other->read_idx_;
-    other->read_idx_ = tmp_int;
-
-    tmp_int = storage_size_;
-    storage_size_ = other->storage_size_;
-    other->storage_size_ = tmp_int;
-  }
-
- protected:
-  char* storage_;
-  int write_idx_;
-  int read_idx_;
-  int storage_size_;
-
- private:
-  //DISALLOW_COPY_AND_ASSIGN(SimpleBuffer);
-};
-
-}  // namespace net
-
-#endif  // NET_TOOLS_FLIP_SERVER_SIMPLE_BUFFER_H__