/** \file MemFile.h
 ** \date  2005-04-25
 ** \author grymse@alhem.net
**/
/*
Copyright (C) 2004-2010  Anders Hedstrom

This library is made available under the terms of the GNU GPL, with
the additional exemption that compiling, linking, and/or using OpenSSL
is allowed.

If you would like to use this library in a closed-source application,
a separate license agreement is available. For information about
the closed-source license agreement for the C++ sockets library,
please visit http://www.alhem.net/Sockets/license.html and/or
email license@alhem.net.

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 _SOCKETS_MemFile_H
#define _SOCKETS_MemFile_H

#include "sockets-config.h"
#include <map>
#include "File.h"
#include "Mutex.h"

#define BLOCKSIZE 32768

#ifdef SOCKETS_NAMESPACE
namespace SOCKETS_NAMESPACE
{
#endif


/** Implements a memory file.
  \ingroup file */
class MemFile : public IFile
{
public:
  /** File block structure.
    \ingroup file */
  struct block_t {
    block_t() : next(NULL) {}
    struct block_t *next;
    char data[BLOCKSIZE];
  };
public:
  /** Create temporary memory buffer, will be freed when object destructs */
  MemFile();
  /** Copy buffer from source, reset read ptr */
  MemFile(MemFile& );
  /** Read file and write to this, create non-temporary memory buffer from f.Path() */
  MemFile(File& f);
  ~MemFile();

  bool fopen(const std::string& path, const std::string& mode);
  void fclose() const;

  size_t fread(char *ptr, size_t size, size_t nmemb) const;
  size_t fwrite(const char *ptr, size_t size, size_t nmemb);

  char *fgets(char *s, int size) const;
  void fprintf(const char *format, ...);

  off_t size() const;
  bool eof() const;

  void reset_read() const;
  void reset_write();

  /** Reference count when copy constructor is used */
  int RefCount() const;
  void Increase();
  void Decrease();

  const std::string& Path() const;

private:
  MemFile& operator=(const MemFile& ) {
    return *this;  // assignment operator
  }

  MemFile& m_src;
  bool m_src_valid;
  block_t *m_base;
  mutable block_t *m_current_read;
  block_t *m_current_write;
  int m_current_write_nr;
  mutable size_t m_read_ptr;
  size_t m_write_ptr;
  mutable bool m_b_read_caused_eof;
  int m_ref_count;
  mutable bool m_ref_decreased;
  std::string m_path;
};




#ifdef SOCKETS_NAMESPACE
}
#endif

#endif // _SOCKETS_MemFile_H

