release/src/router/mysql/storage/csv/transparent_file.h

   1 /*
   2    Copyright (c) 2007 MySQL AB, 2009 Sun Microsystems, Inc.
   3    Use is subject to license terms.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; version 2 of the License.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
  17 */
  18
  19 #include <sys/types.h>
  20 #include <sys/stat.h>
  21 #include <my_dir.h>
  22
  23
  24 class Transparent_file
  25 {
  26   File filedes;
  27   uchar *buff;  /* in-memory window to the file or mmaped area */
  28   /* current window sizes */
  29   my_off_t lower_bound;
  30   my_off_t upper_bound;
  31   uint buff_size;
  32
  33 public:
  34
  35   Transparent_file();
  36   ~Transparent_file();
  37
  38   void init_buff(File filedes_arg);
  39   uchar *ptr();
  40   my_off_t start();
  41   my_off_t end();
  42   char get_value (my_off_t offset);
  43   my_off_t read_next();
  44 };