text: /* Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
     
     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; version 2 of the License.
     
     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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */
  
  #include "myisamdef.h"
  #include "rt_index.h"
  #include "rt_key.h"
  #include "rt_mbr.h"
  
  /*
    Add key to the page
  
    RESULT VALUES
      -1 	Error
      0 	Not split
      1	Split
  */
  
  int rtree_add_key(MI_INFO *info, MI_KEYDEF *keyinfo, uchar *key, 
  		  uint key_length, uchar *page_buf, my_off_t *new_page)
  {
    uint page_size = mi_getint(page_buf);
    uint nod_flag = mi_test_if_nod(page_buf);
    DBUG_ENTER("rtree_add_key");
  
    if (page_size + key_length + info->s->base.rec_reflength <=
        keyinfo->block_length)
    {
      /* split won't be necessary */
      if (nod_flag)
      {
        /* save key */
        DBUG_ASSERT(_mi_kpos(nod_flag, key) < info->state->key_file_length);
        memcpy(rt_PAGE_END(page_buf), key - nod_flag, key_length + nod_flag); 
        page_size += key_length + nod_flag;
      }
      else
      {
        /* save key */
        DBUG_ASSERT(_mi_dpos(info, nod_flag, key + key_length +
                             info->s->base.rec_reflength) <
                    info->state->data_file_length + info->s->base.pack_reclength);
        memcpy(rt_PAGE_END(page_buf), key, key_length + 
                                           info->s->base.rec_reflength);
        page_size += key_length + info->s->base.rec_reflength;
      }
      mi_putint(page_buf, page_size, nod_flag);
      DBUG_RETURN(0);
    }
  
    DBUG_RETURN((rtree_split_page(info, keyinfo, page_buf, key, key_length,
                                  new_page) ? -1 : 1));
  }
  
  /*
    Delete key from the page
  */
  int rtree_delete_key(MI_INFO *info, uchar *page_buf, uchar *key, 
  		     uint key_length, uint nod_flag)
  {
    uint16 page_size = mi_getint(page_buf);
    uchar *key_start;
  
    key_start= key - nod_flag;
    if (!nod_flag)
      key_length += info->s->base.rec_reflength;
  
    memmove(key_start, key + key_length, page_size - key_length -
  	  (key - page_buf));
    page_size-= key_length + nod_flag;
  
    mi_putint(page_buf, page_size, nod_flag);
    return 0;
  }
  
  
  /*
    Calculate and store key MBR
  */
  
  int rtree_set_key_mbr(MI_INFO *info, MI_KEYDEF *keyinfo, uchar *key, 
  		      uint key_length, my_off_t child_page)
  {
    DBUG_ENTER("rtree_set_key_mbr");
  
    if (!_mi_fetch_keypage(info, keyinfo, child_page,
                           DFLT_INIT_HITS, info->buff, 0))
      DBUG_RETURN(-1); /* purecov: inspected */
  
    DBUG_RETURN(rtree_page_mbr(info, keyinfo->seg, info->buff, key, key_length));
  }
   