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// Copyright 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_TOOLS_BALSA_SIMPLE_BUFFER_H__
#define NET_TOOLS_BALSA_SIMPLE_BUFFER_H__
#include <string>
#include "base/compiler_specific.h"
#include "net/tools/balsa/buffer_interface.h"
namespace net {
class SimpleBuffer : public BufferInterface {
public:
SimpleBuffer();
explicit SimpleBuffer(int size);
~SimpleBuffer() override;
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.
int ReadableBytes() const override;
int BufferSize() const override;
int BytesFree() const override;
bool Empty() const override;
bool Full() const override;
int Write(const char* bytes, int size) override;
void GetWritablePtr(char** ptr, int* size) const override;
void GetReadablePtr(char** ptr, int* size) const override;
int Read(char* bytes, int size) override;
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.
bool Reserve(int size) override;
void AdvanceReadablePtr(int amount_to_advance) override;
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_BALSA_SIMPLE_BUFFER_H__
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