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101 lines
2.7 KiB
C
101 lines
2.7 KiB
C
/* Copyright (C) 2000 MySQL AB & Ramil Kalimullin
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#include "myisamdef.h"
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#ifdef HAVE_RTREE_KEYS
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#include "rt_index.h"
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#include "rt_key.h"
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#include "rt_mbr.h"
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/*
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Add key to the page
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RESULT VALUES
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-1 Error
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0 Not split
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1 Split
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*/
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int rtree_add_key(MI_INFO *info, MI_KEYDEF *keyinfo, uchar *key,
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uint key_length, uchar *page_buf, my_off_t *new_page)
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{
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uint page_size = mi_getint(page_buf);
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uint nod_flag = mi_test_if_nod(page_buf);
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if (page_size + key_length + info->s->base.rec_reflength <=
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keyinfo->block_length)
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{
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/* split won't be necessary */
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if (nod_flag)
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{
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/* save key */
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memcpy(rt_PAGE_END(page_buf), key - nod_flag, key_length + nod_flag);
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page_size += key_length + nod_flag;
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}
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else
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{
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/* save key */
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memcpy(rt_PAGE_END(page_buf), key, key_length +
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info->s->base.rec_reflength);
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page_size += key_length + info->s->base.rec_reflength;
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}
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mi_putint(page_buf, page_size, nod_flag);
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return 0;
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}
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return (rtree_split_page(info, keyinfo, page_buf, key, key_length,
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new_page) ? -1 : 1);
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}
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/*
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Delete key from the page
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*/
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int rtree_delete_key(MI_INFO *info, uchar *page_buf, uchar *key,
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uint key_length, uint nod_flag)
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{
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uint16 page_size = mi_getint(page_buf);
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uchar *key_start;
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key_start= key - nod_flag;
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if (!nod_flag)
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key_length += info->s->base.rec_reflength;
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memmove(key_start, key + key_length, page_size - key_length -
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(key - page_buf));
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page_size-= key_length + nod_flag;
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mi_putint(page_buf, page_size, nod_flag);
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return 0;
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}
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/*
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Calculate and store key MBR
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*/
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int rtree_set_key_mbr(MI_INFO *info, MI_KEYDEF *keyinfo, uchar *key,
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uint key_length, my_off_t child_page)
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{
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if (!_mi_fetch_keypage(info, keyinfo, child_page,
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DFLT_INIT_HITS, info->buff, 0))
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return -1;
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return rtree_page_mbr(info, keyinfo->seg, info->buff, key, key_length);
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}
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#endif /*HAVE_RTREE_KEYS*/
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