iostream.hpp

/*
  ANCH Framework: ANother C++ Hack is a C++ framework based on C++11 standard
  Copyright (C) 2020 Vincent Lachenal
 
  This file is part of ANCH Framework.
 
  ANCH Framework is free software: you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
 
  ANCH Framework is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU Lesser General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public License
  along with ANCH Framework.  If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
 
#include <streambuf>
#include <cstring>
#include <sstream>
#include <functional>
 
namespace anch::cutils {

  enum class Direction {

    IN = 0b01,

    OUT = 0b10,

    INOUT = 0b11,
 
  };

  struct cbuffer {

    char* data;

    std::size_t size;

    std::function<std::size_t(char*,std::size_t)> read = nullptr;

    std::function<std::size_t(char*,std::size_t)> write = nullptr;
 
  };
 
  // Classes declaration for \c friend usage +
  class CIStream;
  class COStream;
  class CIOStream;
  // Classes declaration for \c friend usage -

  class CStreambuf: public std::streambuf {
 
    friend anch::cutils::CIStream;
    friend anch::cutils::COStream;
    friend anch::cutils::CIOStream;
 
    // Attributes +
  private:
    anch::cutils::cbuffer _buffer;

    bool _deleteBuffer;
    // Attributes -
 
    // Constructors +
  public:
    CStreambuf(anch::cutils::cbuffer cbuffer, anch::cutils::Direction dir);
 
  protected:
    CStreambuf() noexcept;
    // Constructors -
 
    // Destructor +
  public:
    virtual ~CStreambuf();
    // Destructor -
 
    // Methods +
  public:
    virtual std::streambuf::int_type underflow();

    virtual std::streambuf::int_type overflow(std::streambuf::int_type value);

    virtual int sync();
 
  private:
    void initBuffer();
    // Methods -
 
  };

  class CIStream: public std::istream {
 
    // Constructors +
  public:
    CIStream(anch::cutils::cbuffer cbuffer);
 
  protected:
    CIStream();
    // Constructors -
 
    // Destructor +
  public:
    virtual ~CIStream();
    // Destructor -
 
    // Methods +
  protected:
    void setBuffer(anch::cutils::cbuffer cbuffer);
    // Methods -
 
  };

  class COStream: public std::ostream {
 
    // Constructors +
  public:
    COStream(anch::cutils::cbuffer cbuffer);
 
  protected:
    COStream();
    // Constructors -
 
 
    // Destructor +
  public:
    virtual ~COStream();
    // Destructor -
 
    // Methods +
  protected:
    void setBuffer(anch::cutils::cbuffer cbuffer);
    // Methods -
 
  };

  class CIOStream: public std::iostream {
 
    // Constructors +
  public:
    CIOStream(anch::cutils::cbuffer cbuffer);
 
  protected:
    CIOStream();
    // Constructors -
 
 
    // Destructor +
  public:
    virtual ~CIOStream();
    // Destructor -
 
    // Methods +
  protected:
    void setBuffer(anch::cutils::cbuffer cbuffer);
    // Methods -
 
  };
 
}