/* Copyright (C) 2000 MySQL 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 */

/* This file should be included when using merge_isam_funktions */

#ifndef _myisammrg_h
#define _myisammrg_h
#ifdef	__cplusplus
extern "C" {
#endif

#ifndef _my_base_h
#include <my_base.h>
#endif
#ifndef _myisam_h
#include <myisam.h>
#endif

#include <queues.h>

#define MYRG_NAME_EXT	".MRG"

/* In which table to INSERT rows */
#define MERGE_INSERT_DISABLED	0
#define MERGE_INSERT_TO_FIRST	1
#define MERGE_INSERT_TO_LAST	2

extern TYPELIB merge_insert_method;

	/* Param to/from myrg_info */

typedef struct st_mymerge_info		/* Struct from h_info */
{
  ulonglong records;			/* Records in database */
  ulonglong deleted;			/* Deleted records in database */
  ulonglong recpos;			/* Pos for last used record */
  ulonglong data_file_length;
  uint	reclength;			/* Recordlength */
  int	errkey;				/* With key was dupplicated on err */
  uint	options;			/* HA_OPTION_... used */
  ulong *rec_per_key;			/* for sql optimizing */
} MYMERGE_INFO;

typedef struct st_myrg_table_info
{
  struct st_myisam_info *table;
  ulonglong file_offset;
} MYRG_TABLE;

typedef struct st_myrg_info
{
  MYRG_TABLE *open_tables,*current_table,*end_table,*last_used_table;
  ulonglong records;			/* records in tables */
  ulonglong del;			/* Removed records */
  ulonglong data_file_length;
  ulong  cache_size;
  uint	 merge_insert_method;
  uint	 tables,options,reclength,keys;
  my_bool cache_in_use;
  LIST	 open_list;
  QUEUE  by_key;
  ulong *rec_per_key_part;			/* for sql optimizing */
} MYRG_INFO;


	/* Prototypes for merge-functions */

extern int myrg_close(MYRG_INFO *file);
extern int myrg_delete(MYRG_INFO *file,const byte *buff);
extern MYRG_INFO *myrg_open(const char *name,int mode,int wait_if_locked);
extern int myrg_panic(enum ha_panic_function function);
extern int myrg_rfirst(MYRG_INFO *file,byte *buf,int inx);
extern int myrg_rlast(MYRG_INFO *file,byte *buf,int inx);
extern int myrg_rnext(MYRG_INFO *file,byte *buf,int inx);
extern int myrg_rprev(MYRG_INFO *file,byte *buf,int inx);
extern int myrg_rnext_same(MYRG_INFO *file,byte *buf);
extern int myrg_rkey(MYRG_INFO *file,byte *buf,int inx,const byte *key,
		       uint key_len, enum ha_rkey_function search_flag);
extern int myrg_rrnd(MYRG_INFO *file,byte *buf,ulonglong pos);
extern int myrg_rsame(MYRG_INFO *file,byte *record,int inx);
extern int myrg_update(MYRG_INFO *file,const byte *old,byte *new_rec);
extern int myrg_write(MYRG_INFO *info,byte *rec);
extern int myrg_status(MYRG_INFO *file,MYMERGE_INFO *x,int flag);
extern int myrg_lock_database(MYRG_INFO *file,int lock_type);
extern int myrg_create(const char *name, const char **table_names,
                       uint insert_method, my_bool fix_names);
extern int myrg_extra(MYRG_INFO *file,enum ha_extra_function function,
		      void *extra_arg);
extern void myrg_extrafunc(MYRG_INFO *info,invalidator_by_filename inv);
extern ha_rows myrg_records_in_range(MYRG_INFO *info,int inx,
                                     key_range *min_key, key_range *max_key);

extern ulonglong myrg_position(MYRG_INFO *info);
#ifdef	__cplusplus
}
#endif
#endif
