diff options
Diffstat (limited to 'storage/myisam/rt_key.c')
| -rw-r--r-- | storage/myisam/rt_key.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/storage/myisam/rt_key.c b/storage/myisam/rt_key.c new file mode 100644 index 00000000..3c58a454 --- /dev/null +++ b/storage/myisam/rt_key.c @@ -0,0 +1,107 @@ +/* Copyright (c) 2000, 2002-2005, 2007 MySQL AB + Use is subject to license terms + + 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 02110-1335 USA */ + +#include "myisamdef.h" + +#ifdef HAVE_RTREE_KEYS +#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)); +} + +#endif /*HAVE_RTREE_KEYS*/ |