mariadb/heap/hp_rkey.c

/* 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 */

#include "heapdef.h"

int heap_rkey(HP_INFO *info, byte *record, int inx, const byte *key, 
              uint key_len, enum ha_rkey_function find_flag)
{
  byte *pos;
  HP_SHARE *share=info->s;
  HP_KEYDEF *keyinfo = share->keydef+inx;
  DBUG_ENTER("heap_rkey");
  DBUG_PRINT("enter",("base: %lx  inx: %d",info,inx));

  if ((uint) inx >= share->keys)
  {
    DBUG_RETURN(my_errno=HA_ERR_WRONG_INDEX);
  }
  info->lastinx=inx;
  info->current_record = (ulong) ~0L;		/* For heap_rrnd() */

  if (keyinfo->algorithm == HA_KEY_ALG_BTREE)
  {
    heap_rb_param custom_arg;

    hp_rb_pack_key(info, inx, info->recbuf, key, key_len);

    custom_arg.keyseg = info->s->keydef[inx].seg;
    custom_arg.key_length = key_len;
    custom_arg.search_flag = SEARCH_FIND | SEARCH_SAME;
    /* for next rkey() after deletion */
    if (find_flag == HA_READ_AFTER_KEY)
      info->last_find_flag = HA_READ_KEY_OR_NEXT;
    else if (find_flag == HA_READ_BEFORE_KEY)
      info->last_find_flag = HA_READ_KEY_OR_PREV;
    else
      info->last_find_flag = find_flag;
    info->lastkey_len = key_len;
    if (!(pos = tree_search_key(&keyinfo->rb_tree, info->recbuf, info->parents,
                                &info->last_pos, find_flag, &custom_arg)))
    {
      info->update = 0;
      DBUG_RETURN(my_errno = HA_ERR_KEY_NOT_FOUND);
    }
    memcpy(&pos, pos + hp_rb_key_length(keyinfo, pos), sizeof(byte*));
    info->current_ptr = pos;
  }
  else
  {
    if (!(pos=hp_search(info,share->keydef+inx,key,0)))
    {
      info->update=0;
      DBUG_RETURN(my_errno);
    }
    if (!(keyinfo->flag & HA_NOSAME))
      memcpy(info->lastkey,key,(size_t) keyinfo->length);
  }
  memcpy(record,pos,(size_t) share->reclength);
  info->update=HA_STATE_AKTIV;
  DBUG_RETURN(0);
}


	/* Quick find of record */

gptr heap_find(HP_INFO *info, int inx, const byte *key)
{
  return hp_search(info, info->s->keydef + inx, key, 0);
}