version_checker.h

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#ifndef VERSION_CHECKER_CLASS
#define VERSION_CHECKER_CLASS

/*****************************************************************************\
*                                                                             *
*  Name   : check_version                                                     *
*  Author : Chris Koeritz                                                     *
*  Design : Chris Koeritz & John Stockton                                     *
*                                                                             *
*******************************************************************************
* Copyright (c) 1996-$now By Author.  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 is online at:      *
*     http://www.fsf.org/copyleft/gpl.html                                    *
* Please send any updates to: fred@gruntose.com                               *
\*****************************************************************************/

#include "object_base.h"

// forward.
class version;
class version_record;


class version_checker : public virtual object_base
{
public:
  version_checker(const istring &library_file_name, const version &expected,
          const istring &version_complaint);

  virtual ~version_checker();  

  bool good_version() const;

  // base requirements.
  IMPLEMENT_CLASS_NAME("version_checker");
  istring text_form() const;

  static bool loaded(const istring &library_file_name);
  static void *get_handle(const istring &library_file_name);

  static istring get_name(void *to_find);

  static version get_version(const istring &pathname);

  static bool get_record(const istring &pathname, version_record &to_fill);

  static bool retrieve_version_info(const istring &filename,
          byte_array &to_fill);

  static bool get_language(byte_array &version_chunk, u_short &high,
          u_short &low);

  void complain_wrong_version(const istring &library_file_name,
          const version &expected_version, const version &version_found) const;

  void complain_cannot_load(const istring &library_file_name) const;

private:
  istring *_library_file_name;
  version *_expected_version;
  istring *_version_complaint;

  // forbidden.
  version_checker(const version_checker &);
  version_checker &operator =(const version_checker &);
};

#endif

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