version_checker.h

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#ifndef VERSION_CHECKER_CLASS
#define VERSION_CHECKER_CLASS
 
/*****************************************************************************\
*                                                                             *
*  Name   : check_version                                                     *
*  Author : Chris Koeritz                                                     *
*                                                                             *
*******************************************************************************
* 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 <basis/astring.h>
#include <basis/contracts.h>
#include <structures/version_record.h>
 
namespace versions {
 
 
class version_checker : public virtual basis::root_object
{
public:
  version_checker(const basis::astring &library_file_name, const structures::version &expected,
          const basis::astring &version_complaint);
 
  virtual ~version_checker();  
 
  bool good_version() const;
 
  static basis::astring module_name(const void *module_handle);
 
  // base requirements.
  DEFINE_CLASS_NAME("version_checker");
  basis::astring text_form() const;
 
  static bool loaded(const basis::astring &library_file_name);
  static void *get_handle(const basis::astring &library_file_name);
 
  static basis::astring get_name(const void *to_find);
 
  static structures::version retrieve_version(const basis::astring &pathname);
 
  static bool get_record(const basis::astring &pathname, structures::version_record &to_fill);
 
  static bool retrieve_version_info(const basis::astring &filename,
          basis::byte_array &to_fill);
 
  static bool get_language(basis::byte_array &version_chunk, basis::un_short &high,
          basis::un_short &low);
 
  void complain_wrong_version(const basis::astring &library_file_name,
          const structures::version &expected_version,
          const structures::version &version_found) const;
 
  void complain_cannot_load(const basis::astring &library_file_name) const;
 
private:
  basis::astring *_library_file_name;
  structures::version *_expected_version;
  basis::astring *_version_complaint;
 
  // forbidden.
  version_checker(const version_checker &);
  version_checker &operator =(const version_checker &);
};
 
} //namespace.
 
#endif