NewNet/nnbuffer.h

/*  NewNet - A networking framework in C++
    Copyright (C) 2006 Ingmar K. Steen (iksteen@gmail.com)

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

#ifndef NEWNET_BUFFER_H
#define NEWNET_BUFFER_H

#include "nnobject.h"
#include <sys/types.h>
#include <assert.h>

namespace NewNet
{

  class Buffer : public NewNet::Object
  {
  public:

    Buffer() : m_Ptr(0), m_Pos(0), m_Count(0), m_Left(0)
    {
    }


    Buffer(const Buffer & that) : m_Ptr(0), m_Pos(0), m_Count(0), m_Left(0)
    {
      append(that.data(), that.count());
    }


    Buffer & operator=(const Buffer & that)
    {
      m_Left += m_Pos + m_Count;
      m_Pos = m_Count = 0;
      append(that.data(), that.count());
      return *this;
    }


    ~Buffer();


    unsigned char * data()
    {
      return m_Ptr + m_Pos;
    }


    const unsigned char * data() const
    {
      return m_Ptr + m_Pos;
    }


    size_t count() const
    {
      return m_Count;
    }


    bool empty() const
    {
      return m_Count == 0;
    }


    void seek(size_t n)
    {
      assert(n <= m_Count);
      m_Pos += n;
      m_Count -= n;
    }


    void append(const unsigned char * data, size_t n);

  private:
    unsigned char * m_Ptr;
    size_t m_Pos, m_Count, m_Left;
  };
}

#endif // NEWNET_BUFFER_H

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