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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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 */
/* interface for memory mapped files */
#ifdef __GNUC__
#pragma interface /* gcc class implementation */
#endif
class mapped_files;
mapped_files *map_file(const my_string name,byte *magic,uint magic_length);
void unmap_file(mapped_files *map);
class mapped_files :public ilink {
byte *map;
ha_rows size;
char *name; // name of mapped file
File file; // >= 0 if open
int error; // If not mapped
uint use_count;
public:
mapped_files(const my_string name,byte *magic,uint magic_length);
~mapped_files();
friend class mapped_file;
friend mapped_files *map_file(const my_string name,byte *magic,
uint magic_length);
friend void unmap_file(mapped_files *map);
};
class mapped_file
{
mapped_files *file;
public:
mapped_file(const my_string name,byte *magic,uint magic_length)
{
file=map_file(name,magic,magic_length); /* old or new map */
}
~mapped_file()
{
unmap_file(file); /* free map */
}
byte *map()
{
return file->map;
}
};
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