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
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
|
/* 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 */
/* Functions to handle keys */
#include "isamdef.h"
#include "m_ctype.h"
static void _nisam_put_key_in_record(N_INFO *info,uint keynr,byte *record);
/* Make a intern key from a record */
/* If ascii key convert according to sortorder */
/* Ret: Length of key */
uint _nisam_make_key(register N_INFO *info, uint keynr, uchar *key, const char *record, ulong filepos)
{
uint length;
byte *pos,*end;
uchar *start;
reg1 N_KEYSEG *keyseg;
enum ha_base_keytype type;
DBUG_ENTER("_nisam_make_key");
start=key;
for (keyseg=info->s->keyinfo[keynr].seg ; keyseg->base.type ;keyseg++)
{
type=(enum ha_base_keytype) keyseg->base.type;
if (keyseg->base.flag & HA_SPACE_PACK)
{
pos= (byte*) record+keyseg->base.start; end=pos+keyseg->base.length;
if (type != HA_KEYTYPE_NUM)
{
while (end > pos && end[-1] == ' ')
end--;
}
else
{
while (pos < end && pos[0] == ' ')
pos++;
}
*key++= (uchar) (length=(uint) (end-pos));
memcpy((byte*) key,(byte*) pos,(size_t) length);
#ifdef USE_STRCOLL
if (!use_strcoll(default_charset_info))
#endif
{
if (type == HA_KEYTYPE_TEXT)
case_sort((byte*) key,length);
}
key+=length;
}
else
{
memcpy((byte*) key,(byte*) record+keyseg->base.start,
(size_t) keyseg->base.length);
#ifdef USE_STRCOLL
if (!use_strcoll(default_charset_info))
#endif
{
if (type == HA_KEYTYPE_TEXT)
case_sort((byte*) key,(uint) keyseg->base.length);
}
#ifdef NAN_TEST
else if (type == HA_KEYTYPE_FLOAT)
{
float nr;
bmove((byte*) &nr,(byte*) key,sizeof(float));
if (nr == (float) FLT_MAX)
{
nr= (float) FLT_MAX;
bmove((byte*) key,(byte*) &nr,sizeof(float));
}
}
else if (type == HA_KEYTYPE_DOUBLE)
{
double nr;
bmove((byte*) &nr,(byte*) key,sizeof(double));
if (nr == DBL_MAX)
{
nr=DBL_MAX;
bmove((byte*) key,(byte*) &nr,sizeof(double));
}
}
#endif
key+= keyseg->base.length;
}
}
_nisam_dpointer(info,key,filepos);
DBUG_PRINT("exit",("keynr: %d",keynr));
DBUG_DUMP("key",(byte*) start,(uint) (key-start)+keyseg->base.length);
DBUG_EXECUTE("key",_nisam_print_key(DBUG_FILE,info->s->keyinfo[keynr].seg,start););
DBUG_RETURN((uint) (key-start)); /* Return keylength */
} /* _nisam_make_key */
/* Pack a key to intern format from given format (c_rkey) */
/* if key_length is set returns new length of key */
uint _nisam_pack_key(register N_INFO *info, uint keynr, uchar *key, uchar *old, uint key_length)
/* Length of used key */
{
int k_length;
uint length;
uchar *pos,*end;
reg1 N_KEYSEG *keyseg;
enum ha_base_keytype type;
DBUG_ENTER("_nisam_pack_key");
if ((k_length=(int) key_length) <= 0)
k_length=N_MAX_KEY_BUFF;
for (keyseg=info->s->keyinfo[keynr].seg ;
keyseg->base.type && k_length >0;
k_length-=keyseg->base.length, old+=keyseg->base.length, keyseg++)
{
length=min((uint) keyseg->base.length,(uint) k_length);
type=(enum ha_base_keytype) keyseg->base.type;
if (keyseg->base.flag & HA_SPACE_PACK)
{
pos=old; end=pos+length;
if (type != HA_KEYTYPE_NUM)
{
while (end > pos && end[-1] == ' ')
end--;
}
else
{
while (pos < end && pos[0] == ' ')
pos++;
}
*key++ = (uchar) (length=(uint) (end-pos));
memcpy((byte*) key,pos,(size_t) length);
}
else
memcpy((byte*) key,old,(size_t) length);
#ifdef USE_STRCOLL
if (!use_strcoll(default_charset_info))
#endif
{
if (type == HA_KEYTYPE_TEXT)
case_sort((byte*) key,length);
}
key+= length;
}
if (!keyseg->base.type)
{
if (k_length >= 0) /* Hole key */
key_length=0;
}
else
{ /* Part-key ; fill with null */
length= (uint) -k_length; /* unused part of last key */
do
{
length+= (keyseg->base.flag & HA_SPACE_PACK) ? 1 :
keyseg->base.length;
keyseg++;
} while (keyseg->base.type);
bzero((byte*) key,length);
}
DBUG_RETURN(key_length); /* Return part-keylength */
} /* _nisam_pack_key */
/* Put a key in record */
/* Used when only-keyread is wanted */
static void _nisam_put_key_in_record(register N_INFO *info, uint keynr, byte *record)
{
uint length;
reg2 byte *key;
byte *pos;
reg1 N_KEYSEG *keyseg;
DBUG_ENTER("_nisam_put_key_in_record");
key=(byte*) info->lastkey;
for (keyseg=info->s->keyinfo[keynr].seg ; keyseg->base.type ;keyseg++)
{
if (keyseg->base.flag & HA_SPACE_PACK)
{
length= (uint) (uchar) *key++;
pos= record+keyseg->base.start;
if (keyseg->base.type != (int) HA_KEYTYPE_NUM)
{
memcpy(pos,key,(size_t) length);
bfill(pos+length,keyseg->base.length-length,' ');
}
else
{
bfill(pos,keyseg->base.length-length,' ');
memcpy(pos+keyseg->base.length-length,key,(size_t) length);
}
key+=length;
}
else
{
memcpy(record+keyseg->base.start,(byte*) key,
(size_t) keyseg->base.length);
key+= keyseg->base.length;
}
}
DBUG_VOID_RETURN;
} /* _nisam_put_key_in_record */
/* Here when key reads are used */
int _nisam_read_key_record(N_INFO *info, ulong filepos, byte *buf)
{
VOID(_nisam_writeinfo(info,0));
if (filepos != NI_POS_ERROR)
{
if (info->lastinx >= 0)
{ /* Read only key */
_nisam_put_key_in_record(info,(uint) info->lastinx,buf);
info->update|= HA_STATE_AKTIV; /* We should find a record */
return 0;
}
my_errno=HA_ERR_WRONG_INDEX;
return(-1);
}
return(-1); /* Wrong data to read */
}
|
