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
|
/**********************************************************************
Utilities for converting data from the database file
to the machine format.
(c) 1995 Innobase Oy
Created 11/28/1995 Heikki Tuuri
***********************************************************************/
#ifndef mach0data_h
#define mach0data_h
#include "univ.i"
#include "ut0byte.h"
/* The data and all fields are always stored in a database file
in the same format: ascii, big-endian, ... .
All data in the files MUST be accessed using the functions in this
module. */
/***********************************************************
The following function is used to store data in one byte. */
UNIV_INLINE
void
mach_write_to_1(
/*============*/
byte* b, /* in: pointer to byte where to store */
ulint n); /* in: ulint integer to be stored, >= 0, < 256 */
/************************************************************
The following function is used to fetch data from one byte. */
UNIV_INLINE
ulint
mach_read_from_1(
/*=============*/
/* out: ulint integer, >= 0, < 256 */
byte* b); /* in: pointer to byte */
/***********************************************************
The following function is used to store data in two consecutive
bytes. We store the most significant byte to the lower address. */
UNIV_INLINE
void
mach_write_to_2(
/*============*/
byte* b, /* in: pointer to two bytes where to store */
ulint n); /* in: ulint integer to be stored, >= 0, < 64k */
/************************************************************
The following function is used to fetch data from two consecutive
bytes. The most significant byte is at the lowest address. */
UNIV_INLINE
ulint
mach_read_from_2(
/*=============*/
/* out: ulint integer, >= 0, < 64k */
byte* b); /* in: pointer to two bytes */
/***********************************************************
The following function is used to store data in 3 consecutive
bytes. We store the most significant byte to the lowest address. */
UNIV_INLINE
void
mach_write_to_3(
/*============*/
byte* b, /* in: pointer to 3 bytes where to store */
ulint n); /* in: ulint integer to be stored */
/************************************************************
The following function is used to fetch data from 3 consecutive
bytes. The most significant byte is at the lowest address. */
UNIV_INLINE
ulint
mach_read_from_3(
/*=============*/
/* out: ulint integer */
byte* b); /* in: pointer to 3 bytes */
/***********************************************************
The following function is used to store data in four consecutive
bytes. We store the most significant byte to the lowest address. */
UNIV_INLINE
void
mach_write_to_4(
/*============*/
byte* b, /* in: pointer to four bytes where to store */
ulint n); /* in: ulint integer to be stored */
/************************************************************
The following function is used to fetch data from 4 consecutive
bytes. The most significant byte is at the lowest address. */
UNIV_INLINE
ulint
mach_read_from_4(
/*=============*/
/* out: ulint integer */
byte* b); /* in: pointer to four bytes */
/*************************************************************
Writes a ulint in a compressed form (1..5 bytes). */
UNIV_INLINE
ulint
mach_write_compressed(
/*==================*/
/* out: stored size in bytes */
byte* b, /* in: pointer to memory where to store */
ulint n); /* in: ulint integer to be stored */
/*************************************************************
Returns the size of an ulint when written in the compressed form. */
UNIV_INLINE
ulint
mach_get_compressed_size(
/*=====================*/
/* out: compressed size in bytes */
ulint n); /* in: ulint integer to be stored */
/*************************************************************
Reads a ulint in a compressed form. */
UNIV_INLINE
ulint
mach_read_compressed(
/*=================*/
/* out: read integer */
byte* b); /* in: pointer to memory from where to read */
/***********************************************************
The following function is used to store data in 6 consecutive
bytes. We store the most significant byte to the lowest address. */
UNIV_INLINE
void
mach_write_to_6(
/*============*/
byte* b, /* in: pointer to 6 bytes where to store */
dulint n); /* in: dulint integer to be stored */
/************************************************************
The following function is used to fetch data from 6 consecutive
bytes. The most significant byte is at the lowest address. */
UNIV_INLINE
dulint
mach_read_from_6(
/*=============*/
/* out: dulint integer */
byte* b); /* in: pointer to 6 bytes */
/***********************************************************
The following function is used to store data in 7 consecutive
bytes. We store the most significant byte to the lowest address. */
UNIV_INLINE
void
mach_write_to_7(
/*============*/
byte* b, /* in: pointer to 7 bytes where to store */
dulint n); /* in: dulint integer to be stored */
/************************************************************
The following function is used to fetch data from 7 consecutive
bytes. The most significant byte is at the lowest address. */
UNIV_INLINE
dulint
mach_read_from_7(
/*=============*/
/* out: dulint integer */
byte* b); /* in: pointer to 7 bytes */
/***********************************************************
The following function is used to store data in 8 consecutive
bytes. We store the most significant byte to the lowest address. */
UNIV_INLINE
void
mach_write_to_8(
/*============*/
byte* b, /* in: pointer to 8 bytes where to store */
dulint n); /* in: dulint integer to be stored */
/************************************************************
The following function is used to fetch data from 8 consecutive
bytes. The most significant byte is at the lowest address. */
UNIV_INLINE
dulint
mach_read_from_8(
/*=============*/
/* out: dulint integer */
byte* b); /* in: pointer to 8 bytes */
/*************************************************************
Writes a dulint in a compressed form (5..9 bytes). */
UNIV_INLINE
ulint
mach_dulint_write_compressed(
/*=========================*/
/* out: size in bytes */
byte* b, /* in: pointer to memory where to store */
dulint n); /* in: dulint integer to be stored */
/*************************************************************
Returns the size of a dulint when written in the compressed form. */
UNIV_INLINE
ulint
mach_dulint_get_compressed_size(
/*============================*/
/* out: compressed size in bytes */
dulint n); /* in: dulint integer to be stored */
/*************************************************************
Reads a dulint in a compressed form. */
UNIV_INLINE
dulint
mach_dulint_read_compressed(
/*========================*/
/* out: read dulint */
byte* b); /* in: pointer to memory from where to read */
/*************************************************************
Writes a dulint in a compressed form (1..11 bytes). */
UNIV_INLINE
ulint
mach_dulint_write_much_compressed(
/*==============================*/
/* out: size in bytes */
byte* b, /* in: pointer to memory where to store */
dulint n); /* in: dulint integer to be stored */
/*************************************************************
Returns the size of a dulint when written in the compressed form. */
UNIV_INLINE
ulint
mach_dulint_get_much_compressed_size(
/*=================================*/
/* out: compressed size in bytes */
dulint n); /* in: dulint integer to be stored */
/*************************************************************
Reads a dulint in a compressed form. */
UNIV_INLINE
dulint
mach_dulint_read_much_compressed(
/*=============================*/
/* out: read dulint */
byte* b); /* in: pointer to memory from where to read */
/*************************************************************
Reads a ulint in a compressed form if the log record fully contains it. */
byte*
mach_parse_compressed(
/*==================*/
/* out: pointer to end of the stored field, NULL if
not complete */
byte* ptr, /* in: pointer to buffer from where to read */
byte* end_ptr,/* in: pointer to end of the buffer */
ulint* val); /* out: read value */
/*************************************************************
Reads a dulint in a compressed form if the log record fully contains it. */
byte*
mach_dulint_parse_compressed(
/*=========================*/
/* out: pointer to end of the stored field, NULL if
not complete */
byte* ptr, /* in: pointer to buffer from where to read */
byte* end_ptr,/* in: pointer to end of the buffer */
dulint* val); /* out: read value */
/*************************************************************
Reads a double. It is stored in a little-endian format. */
UNIV_INLINE
double
mach_double_read(
/*=============*/
/* out: double read */
byte* b); /* in: pointer to memory from where to read */
/*************************************************************
Writes a double. It is stored in a little-endian format. */
UNIV_INLINE
void
mach_double_write(
/*==============*/
byte* b, /* in: pointer to memory where to write */
double d); /* in: double */
/*************************************************************
Reads a float. It is stored in a little-endian format. */
UNIV_INLINE
float
mach_float_read(
/*=============*/
/* out: float read */
byte* b); /* in: pointer to memory from where to read */
/*************************************************************
Writes a float. It is stored in a little-endian format. */
UNIV_INLINE
void
mach_float_write(
/*==============*/
byte* b, /* in: pointer to memory where to write */
float d); /* in: float */
/*************************************************************
Reads a ulint stored in the little-endian format. */
UNIV_INLINE
ulint
mach_read_from_n_little_endian(
/*===========================*/
/* out: unsigned long int */
byte* buf, /* in: from where to read */
ulint buf_size); /* in: from how many bytes to read */
/*************************************************************
Writes a ulint in the little-endian format. */
UNIV_INLINE
void
mach_write_to_n_little_endian(
/*==========================*/
byte* dest, /* in: where to write */
ulint dest_size, /* in: into how many bytes to write */
ulint n); /* in: unsigned long int to write */
/*************************************************************
Reads a ulint stored in the little-endian format. */
UNIV_INLINE
ulint
mach_read_from_2_little_endian(
/*===========================*/
/* out: unsigned long int */
byte* buf); /* in: from where to read */
/*************************************************************
Writes a ulint in the little-endian format. */
UNIV_INLINE
void
mach_write_to_2_little_endian(
/*==========================*/
byte* dest, /* in: where to write */
ulint n); /* in: unsigned long int to write */
#ifndef UNIV_NONINL
#include "mach0data.ic"
#endif
#endif
|
