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
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
|
/* - mode: c++ c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 MySQL
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include <drizzled/field/varstring.h>
#include <drizzled/table.h>
#include <drizzled/session.h>
#include <plugin/myisam/myisam.h>
#include <string>
using namespace std;
namespace drizzled
{
/****************************************************************************
VARCHAR type
Data in field->ptr is stored as:
1 or 2 bytes length-prefix-header (from Field_varstring::length_bytes)
data
NOTE:
When VARCHAR is stored in a key (for handler::index_read() etc) it's always
stored with a 2 byte prefix. (Just like blob keys).
Normally length_bytes is calculated as (field_length < 256 : 1 ? 2)
The exception is if there is a prefix key field that is part of a long
VARCHAR, in which case field_length for this may be 1 but the length_bytes
is 2.
****************************************************************************/
const uint32_t Field_varstring::MAX_SIZE= UINT16_MAX;
Field_varstring::Field_varstring(unsigned char *ptr_arg,
uint32_t len_arg,
uint32_t length_bytes_arg,
unsigned char *null_ptr_arg,
unsigned char null_bit_arg,
const char *field_name_arg,
const charset_info_st * const cs) :
Field_str(ptr_arg,
len_arg,
null_ptr_arg,
null_bit_arg,
field_name_arg, cs),
length_bytes(length_bytes_arg)
{
}
Field_varstring::Field_varstring(uint32_t len_arg,
bool maybe_null_arg,
const char *field_name_arg,
const charset_info_st * const cs) :
Field_str((unsigned char*) 0,
len_arg,
maybe_null_arg ? (unsigned char*) "": 0,
0,
field_name_arg,
cs),
length_bytes(len_arg < 256 ? 1 :2)
{
}
int Field_varstring::store(const char *from,uint32_t length, const charset_info_st * const cs)
{
uint32_t copy_length;
const char *well_formed_error_pos;
const char *cannot_convert_error_pos;
const char *from_end_pos;
ASSERT_COLUMN_MARKED_FOR_WRITE;
copy_length= well_formed_copy_nchars(field_charset,
(char*) ptr + length_bytes,
field_length,
cs, from, length,
field_length / field_charset->mbmaxlen,
&well_formed_error_pos,
&cannot_convert_error_pos,
&from_end_pos);
if (length_bytes == 1)
*ptr= (unsigned char) copy_length;
else
int2store(ptr, copy_length);
if (check_string_copy_error(this, well_formed_error_pos,
cannot_convert_error_pos, from + length, cs))
return 2;
return report_if_important_data(from_end_pos, from + length);
}
int Field_varstring::store(int64_t nr, bool unsigned_val)
{
char buff[64];
uint32_t length;
length= (uint32_t) (field_charset->cset->int64_t10_to_str)(field_charset,
buff,
sizeof(buff),
(unsigned_val ? 10: -10),
nr);
return Field_varstring::store(buff, length, field_charset);
}
double Field_varstring::val_real(void) const
{
int not_used;
char *end_not_used;
ASSERT_COLUMN_MARKED_FOR_READ;
uint32_t length= length_bytes == 1 ? (uint32_t) *ptr : uint2korr(ptr);
return my_strntod(field_charset, (char*) ptr+length_bytes, length,
&end_not_used, ¬_used);
}
int64_t Field_varstring::val_int(void) const
{
int not_used;
char *end_not_used;
uint32_t length;
ASSERT_COLUMN_MARKED_FOR_READ;
length= length_bytes == 1 ? (uint32_t) *ptr : uint2korr(ptr);
return my_strntoll(field_charset, (char*) ptr+length_bytes, length, 10,
&end_not_used, ¬_used);
}
String *Field_varstring::val_str(String *, String *val_ptr) const
{
uint32_t length= length_bytes == 1 ? (uint32_t) *ptr : uint2korr(ptr);
ASSERT_COLUMN_MARKED_FOR_READ;
val_ptr->set((const char*) ptr+length_bytes, length, field_charset);
return val_ptr;
}
type::Decimal *Field_varstring::val_decimal(type::Decimal *decimal_value) const
{
uint32_t length;
ASSERT_COLUMN_MARKED_FOR_READ;
length= length_bytes == 1 ? (uint32_t) *ptr : uint2korr(ptr);
decimal_value->store(E_DEC_FATAL_ERROR, (char*) ptr+length_bytes, length, charset());
return decimal_value;
}
int Field_varstring::cmp_max(const unsigned char *a_ptr, const unsigned char *b_ptr,
uint32_t max_len)
{
uint32_t a_length, b_length;
int diff;
if (length_bytes == 1)
{
a_length= (uint32_t) *a_ptr;
b_length= (uint32_t) *b_ptr;
}
else
{
a_length= uint2korr(a_ptr);
b_length= uint2korr(b_ptr);
}
set_if_smaller(a_length, max_len);
set_if_smaller(b_length, max_len);
diff= field_charset->coll->strnncollsp(field_charset,
a_ptr+
length_bytes,
a_length,
b_ptr+
length_bytes,
b_length,0);
return diff;
}
/**
@note
varstring and blob keys are ALWAYS stored with a 2 byte length prefix
*/
int Field_varstring::key_cmp(const unsigned char *key_ptr, uint32_t max_key_length)
{
uint32_t length= length_bytes == 1 ? (uint32_t) *ptr : uint2korr(ptr);
uint32_t local_char_length= max_key_length / field_charset->mbmaxlen;
local_char_length= my_charpos(field_charset, ptr + length_bytes,
ptr + length_bytes + length, local_char_length);
set_if_smaller(length, local_char_length);
return field_charset->coll->strnncollsp(field_charset,
ptr + length_bytes,
length,
key_ptr+
HA_KEY_BLOB_LENGTH,
uint2korr(key_ptr), 0);
}
/**
Compare to key segments (always 2 byte length prefix).
@note
This is used only to compare key segments created for index_read().
(keys are created and compared in key.cc)
*/
int Field_varstring::key_cmp(const unsigned char *a,const unsigned char *b)
{
return field_charset->coll->strnncollsp(field_charset,
a + HA_KEY_BLOB_LENGTH,
uint2korr(a),
b + HA_KEY_BLOB_LENGTH,
uint2korr(b),
0);
}
void Field_varstring::sort_string(unsigned char *to,uint32_t length)
{
uint32_t tot_length= length_bytes == 1 ? (uint32_t) *ptr : uint2korr(ptr);
if (field_charset == &my_charset_bin)
{
/* Store length last in high-byte order to sort longer strings first */
if (length_bytes == 1)
to[length-1]= tot_length;
else
mi_int2store(to+length-2, tot_length);
length-= length_bytes;
}
tot_length= field_charset->strnxfrm(to, length, ptr + length_bytes, tot_length);
assert(tot_length == length);
}
enum ha_base_keytype Field_varstring::key_type() const
{
enum ha_base_keytype res;
if (binary())
res= length_bytes == 1 ? HA_KEYTYPE_VARBINARY1 : HA_KEYTYPE_VARBINARY2;
else
res= length_bytes == 1 ? HA_KEYTYPE_VARTEXT1 : HA_KEYTYPE_VARTEXT2;
return res;
}
uint32_t Field_varstring::used_length()
{
return length_bytes == 1 ? 1 + (uint32_t) (unsigned char) *ptr : 2 + uint2korr(ptr);
}
/*
Functions to create a packed row.
Here the number of length bytes are depending on the given max_length
*/
unsigned char *Field_varstring::pack(unsigned char *to, const unsigned char *from,
uint32_t max_length,
bool )
{
uint32_t length= length_bytes == 1 ? (uint32_t) *from : uint2korr(from);
set_if_smaller(max_length, field_length);
if (length > max_length)
length=max_length;
/* Length always stored little-endian */
*to++= length & 0xFF;
if (max_length > 255)
*to++= (length >> 8) & 0xFF;
/* Store bytes of string */
if (length > 0)
memcpy(to, from+length_bytes, length);
return to+length;
}
/**
Unpack a varstring field from row data.
This method is used to unpack a varstring field from a master
whose size of the field is less than that of the slave.
@note
The string length is always packed little-endian.
@param to Destination of the data
@param from Source of the data
@param param_data Length bytes from the master's field data
@return New pointer into memory based on from + length of the data
*/
const unsigned char *
Field_varstring::unpack(unsigned char *to, const unsigned char *from,
uint32_t param_data,
bool )
{
uint32_t length;
uint32_t l_bytes= (param_data && (param_data < field_length)) ?
(param_data <= 255) ? 1 : 2 : length_bytes;
if (l_bytes == 1)
{
to[0]= *from++;
length= to[0];
if (length_bytes == 2)
to[1]= 0;
}
else /* l_bytes == 2 */
{
length= uint2korr(from);
to[0]= *from++;
to[1]= *from++;
}
if (length)
memcpy(to+ length_bytes, from, length);
return from+length;
}
uint32_t Field_varstring::max_packed_col_length(uint32_t max_length)
{
return (max_length > 255 ? 2 : 1)+max_length;
}
uint32_t Field_varstring::get_key_image(basic_string<unsigned char> &buff, uint32_t length)
{
/* Key is always stored with 2 bytes */
const uint32_t key_len= 2;
uint32_t f_length= length_bytes == 1 ? (uint32_t) *ptr : uint2korr(ptr);
uint32_t local_char_length= length / field_charset->mbmaxlen;
unsigned char *pos= ptr+length_bytes;
local_char_length= my_charpos(field_charset, pos, pos + f_length,
local_char_length);
set_if_smaller(f_length, local_char_length);
unsigned char len_buff[key_len];
int2store(len_buff,f_length);
buff.append(len_buff);
buff.append(pos, f_length);
if (f_length < length)
{
/*
Must clear this as we do a memcmp in optimizer/range.cc to detect
identical keys
*/
buff.append(length-f_length, 0);
}
return key_len+f_length;
}
uint32_t Field_varstring::get_key_image(unsigned char *buff, uint32_t length)
{
uint32_t f_length= length_bytes == 1 ? (uint32_t) *ptr : uint2korr(ptr);
uint32_t local_char_length= length / field_charset->mbmaxlen;
unsigned char *pos= ptr+length_bytes;
local_char_length= my_charpos(field_charset, pos, pos + f_length,
local_char_length);
set_if_smaller(f_length, local_char_length);
/* Key is always stored with 2 bytes */
int2store(buff,f_length);
memcpy(buff+HA_KEY_BLOB_LENGTH, pos, f_length);
if (f_length < length)
{
/*
Must clear this as we do a memcmp in optimizer/range.cc to detect
identical keys
*/
memset(buff+HA_KEY_BLOB_LENGTH+f_length, 0, (length-f_length));
}
return HA_KEY_BLOB_LENGTH+f_length;
}
void Field_varstring::set_key_image(const unsigned char *buff, uint32_t length)
{
length= uint2korr(buff); // Real length is here
(void) Field_varstring::store((const char*) buff+HA_KEY_BLOB_LENGTH, length, field_charset);
}
int Field_varstring::cmp_binary(const unsigned char *a_ptr,
const unsigned char *b_ptr,
uint32_t max_length)
{
uint32_t a_length,b_length;
if (length_bytes == 1)
{
a_length= (uint32_t) *a_ptr;
b_length= (uint32_t) *b_ptr;
}
else
{
a_length= uint2korr(a_ptr);
b_length= uint2korr(b_ptr);
}
set_if_smaller(a_length, max_length);
set_if_smaller(b_length, max_length);
if (a_length != b_length)
return 1;
return memcmp(a_ptr+length_bytes, b_ptr+length_bytes, a_length);
}
Field *Field_varstring::new_field(memory::Root *root, Table *new_table, bool keep_type)
{
Field_varstring *res= (Field_varstring*) Field::new_field(root, new_table,
keep_type);
if (res)
res->length_bytes= length_bytes;
return res;
}
Field *Field_varstring::new_key_field(memory::Root *root,
Table *new_table,
unsigned char *new_ptr, unsigned char *new_null_ptr,
uint32_t new_null_bit)
{
Field_varstring *res;
if ((res= (Field_varstring*) Field::new_key_field(root,
new_table,
new_ptr,
new_null_ptr,
new_null_bit)))
{
/* Keys length prefixes are always packed with 2 bytes */
res->length_bytes= 2;
}
return res;
}
} /* namespace drizzled */
|