1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/* 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 */
/* Written by Sergei A. Golubchik, who has a shared copyright to this code */
/* functions to work with full-text indices */
#include "ftdefs.h"
/**************************************************************
This is to make ft-code to ignore keyseg.length at all *
and to index the whole VARCHAR/BLOB instead... */
#undef set_if_smaller
#define set_if_smaller(A,B) /* no op */
/**************************************************************/
/* parses a document i.e. calls _mi_ft_parse for every keyseg */
static FT_WORD * _mi_ft_parserecord(MI_INFO *info, uint keynr, byte *keybuf, const byte *record)
{
TREE *parsed=NULL;
MI_KEYSEG *keyseg;
byte *pos;
uint i;
i=info->s->keyinfo[keynr].keysegs-FT_SEGS;
keyseg=info->s->keyinfo[keynr].seg;
while(i--)
{
uint len;
keyseg--;
if (keyseg->null_bit && (record[keyseg->null_pos] & keyseg->null_bit))
continue; /* NULL field */
pos= (byte *)record+keyseg->start;
if (keyseg->flag & HA_VAR_LENGTH)
{
len=uint2korr(pos);
pos+=2; /* Skip VARCHAR length */
set_if_smaller(len,keyseg->length);
}
else if (keyseg->flag & HA_BLOB_PART)
{
len=_mi_calc_blob_length(keyseg->bit_start,pos);
memcpy_fixed(&pos,pos+keyseg->bit_start,sizeof(char*));
set_if_smaller(len,keyseg->length);
}
else
len=keyseg->length;
parsed=ft_parse(parsed, pos, len);
if(parsed==NULL) return NULL;
}
return ft_linearize(info, keynr, keybuf, parsed);
}
static int _mi_ft_store(MI_INFO *info, uint keynr, byte *keybuf,
FT_WORD *wlist, my_off_t filepos)
{
uint key_length;
while(wlist->pos)
{
key_length=_ft_make_key(info,keynr,keybuf,wlist,filepos);
if (_mi_ck_write(info,keynr,(uchar*) keybuf,key_length))
return 1;
wlist++;
}
return 0;
}
static int _mi_ft_erase(MI_INFO *info, uint keynr, byte *keybuf, FT_WORD *wlist, my_off_t filepos)
{
uint key_length, err=0;
while(wlist->pos)
{
key_length=_ft_make_key(info,keynr,keybuf,wlist,filepos);
if (_mi_ck_delete(info,keynr,(uchar*) keybuf,key_length))
err=1;
wlist++;
}
return err;
}
/* compares an appropriate parts of two WORD_KEY keys directly out of records */
/* returns 1 if they are different */
#define THOSE_TWO_DAMN_KEYS_ARE_REALLY_DIFFERENT 1
#define GEE_THEY_ARE_ABSOLUTELY_IDENTICAL 0
int _mi_ft_cmp(MI_INFO *info, uint keynr, const byte *rec1, const byte *rec2)
{
MI_KEYSEG *keyseg;
byte *pos1, *pos2;
uint i;
i=info->s->keyinfo[keynr].keysegs-FT_SEGS;
keyseg=info->s->keyinfo[keynr].seg;
while(i--)
{
uint len1, len2;
LINT_INIT(len1); LINT_INIT(len2);
keyseg--;
if (keyseg->null_bit)
{
if ( (rec1[keyseg->null_pos] ^ rec2[keyseg->null_pos])
& keyseg->null_bit )
return THOSE_TWO_DAMN_KEYS_ARE_REALLY_DIFFERENT;
if (rec1[keyseg->null_pos] & keyseg->null_bit )
continue; /* NULL field */
}
pos1= (byte *)rec1+keyseg->start;
pos2= (byte *)rec2+keyseg->start;
if (keyseg->flag & HA_VAR_LENGTH)
{
len1=uint2korr(pos1);
pos1+=2; /* Skip VARCHAR length */
set_if_smaller(len1,keyseg->length);
len2=uint2korr(pos2);
pos2+=2; /* Skip VARCHAR length */
set_if_smaller(len2,keyseg->length);
}
else if (keyseg->flag & HA_BLOB_PART)
{
len1=_mi_calc_blob_length(keyseg->bit_start,pos1);
memcpy_fixed(&pos1,pos1+keyseg->bit_start,sizeof(char*));
set_if_smaller(len1,keyseg->length);
len2=_mi_calc_blob_length(keyseg->bit_start,pos2);
memcpy_fixed(&pos2,pos2+keyseg->bit_start,sizeof(char*));
set_if_smaller(len2,keyseg->length);
}
if ((len1 != len2) || memcmp(pos1, pos2, len1))
return THOSE_TWO_DAMN_KEYS_ARE_REALLY_DIFFERENT;
}
return GEE_THEY_ARE_ABSOLUTELY_IDENTICAL;
}
/* adds a document to the collection */
int _mi_ft_add(MI_INFO *info, uint keynr, byte *keybuf, const byte *record, my_off_t pos)
{
FT_WORD *wlist;
if(!(wlist=_mi_ft_parserecord(info, keynr, keybuf, record))) return -1;
return _mi_ft_store(info,keynr,keybuf,wlist,pos);
}
/* removes a document from the collection */
int _mi_ft_del(MI_INFO *info, uint keynr, byte *keybuf, const byte *record, my_off_t pos)
{
FT_WORD *wlist;
if(!(wlist=_mi_ft_parserecord(info, keynr, keybuf, record))) return -1;
return _mi_ft_erase(info,keynr,keybuf,wlist,pos);
}
uint _ft_make_key(MI_INFO *info, uint keynr, byte *keybuf, FT_WORD *wptr, my_off_t filepos)
{
byte buf[HA_FT_MAXLEN+16];
#if HA_FT_WTYPE == HA_KEYTYPE_FLOAT
float weight=(float) ((filepos==HA_OFFSET_ERROR) ? 0 : wptr->weight);
mi_float4store(buf,weight);
#else
#error
#endif
#ifdef EVAL_RUN
*(buf+HA_FT_WLEN)=wptr->cnt;
int2store(buf+HA_FT_WLEN+1,wptr->len);
memcpy(buf+HA_FT_WLEN+3,wptr->pos,wptr->len);
#else /* EVAL_RUN */
int2store(buf+HA_FT_WLEN,wptr->len);
memcpy(buf+HA_FT_WLEN+2,wptr->pos,wptr->len);
#endif /* EVAL_RUN */
return _mi_make_key(info,keynr,(uchar*) keybuf,buf,filepos);
}
|
