Remove flip_server.

net/tools/flip_server/ring_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_RING_BUFFER_H__
-#define NET_TOOLS_FLIP_SERVER_RING_BUFFER_H__
-
-#include <memory>
-
-#include "base/compiler_specific.h"
-#include "net/tools/balsa/buffer_interface.h"
-
-namespace net {
-
-// The ring buffer is a circular buffer, that is, reads or writes may wrap
-// around the end of the linear memory contained by the class (and back to
-// the beginning). This is a good choice when you want to use a fixed amount
-// of buffering and don't want to be moving memory around a lot.
-//
-// What is the penalty for using this over a normal, linear buffer?
-// Reading all the data may take two operations, and
-// writing all the data may take two operations.
-//
-// In the proxy, this class is used as a fixed size buffer between
-// clients and servers (so that the memory size is constrained).
-
-class RingBuffer : public BufferInterface {
- public:
-  explicit RingBuffer(int buffer_size);
-  ~RingBuffer() override;
-
-  // Resize the buffer to the size specified here.  If the buffer_size passed
-  // in here is smaller than the amount of data in the buffer, then the oldest
-  // data will be dropped, but all other data will be saved.
-  // This means: If the buffer size is increasing, all data  that was resident
-  // in the buffer prior to this call will be resident after this call.
-  void Resize(int buffer_size);
-
-  // The following functions all override pure virtual functions
-  // in BufferInterface. See buffer_interface.h for a description
-  // of what they do if the function isn't documented here.
-  int ReadableBytes() const override;
-  int BufferSize() const override;
-  int BytesFree() const override;
-
-  bool Empty() const override;
-  bool Full() const override;
-
-  // returns the number of characters written.
-  // appends up-to-'size' bytes to the ringbuffer.
-  int Write(const char* bytes, int size) override;
-
-  // Stores a pointer into the ring buffer in *ptr,  and stores the number of
-  // characters which are allowed to be written in *size.
-  // If there are no writable bytes available, then *size will contain 0.
-  void GetWritablePtr(char** ptr, int* size) const override;
-
-  // Stores a pointer into the ring buffer in *ptr,  and stores the number of
-  // characters which are allowed to be read in *size.
-  // If there are no readable bytes available, then *size will contain 0.
-  void GetReadablePtr(char** ptr, int* size) const override;
-
-  // Returns the number of bytes read into 'bytes'.
-  int Read(char* bytes, int size) override;
-
-  // Removes all data from the ring buffer.
-  void Clear() override;
-
-  // Reserves contiguous writable empty space in the buffer of size bytes.
-  // Since the point of this class is to have a fixed size buffer, be careful
-  // not to inadvertently resize the buffer using Reserve(). If the reserve
-  // size is <= BytesFree(), it is guaranteed that the buffer size will not
-  // change.
-  // This can be an expensive operation, it may new a buffer copy all existing
-  // data and delete the old 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. If the size requested is less than
-  // or equal to BytesFree(), it is guaranteed that the buffer size will not
-  // change.
-  bool Reserve(int size) override;
-
-  // Removes the oldest 'amount_to_advance' characters.
-  // If amount_to_consume > ReadableBytes(), this performs a Clear() instead.
-  void AdvanceReadablePtr(int amount_to_advance) override;
-
-  // Moves the internal pointers around such that the  amount of data specified
-  // here is expected to already be resident (as if it was Written).
-  void AdvanceWritablePtr(int amount_to_advance) override;
-
- protected:
-  int read_idx() const { return read_idx_; }
-  int write_idx() const { return write_idx_; }
-  int bytes_used() const { return bytes_used_; }
-  int buffer_size() const { return buffer_size_; }
-  const char* buffer() const { return buffer_.get(); }
-
-  int set_read_idx(int idx) { return read_idx_ = idx; }
-  int set_write_idx(int idx) { return write_idx_ = idx; }
-
- private:
-  std::unique_ptr<char[]> buffer_;
-  int buffer_size_;
-  int bytes_used_;
-  int read_idx_;
-  int write_idx_;
-
-  RingBuffer(const RingBuffer&);
-  void operator=(const RingBuffer&);
-};
-
-}  // namespace net
-
-#endif  // NET_TOOLS_FLIP_SERVER_RING_BUFFER_H__