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
|
/******************************************************
Copyright (c) 2012 Percona Ireland Ltd.
buffer datasink for XtraBackup.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*******************************************************/
/* Does buffered output to a destination datasink set with ds_set_pipe().
Writes to the destination datasink are guaranteed to not be smaller than a
specified buffer size (DS_DEFAULT_BUFFER_SIZE by default), with the only
exception for the last write for a file. */
#include <mysql_version.h>
#include <my_base.h>
#include "ds_buffer.h"
#include "common.h"
#include "datasink.h"
#define DS_DEFAULT_BUFFER_SIZE (64 * 1024)
typedef struct {
ds_file_t *dst_file;
char *buf;
size_t pos;
size_t size;
} ds_buffer_file_t;
typedef struct {
size_t buffer_size;
} ds_buffer_ctxt_t;
static ds_ctxt_t *buffer_init(const char *root);
static ds_file_t *buffer_open(ds_ctxt_t *ctxt, const char *path,
MY_STAT *mystat);
static int buffer_write(ds_file_t *file, const void *buf, size_t len);
static int buffer_close(ds_file_t *file);
static void buffer_deinit(ds_ctxt_t *ctxt);
datasink_t datasink_buffer = {
&buffer_init,
&buffer_open,
&buffer_write,
&buffer_close,
&buffer_deinit
};
/* Change the default buffer size */
void ds_buffer_set_size(ds_ctxt_t *ctxt, size_t size)
{
ds_buffer_ctxt_t *buffer_ctxt = (ds_buffer_ctxt_t *) ctxt->ptr;
buffer_ctxt->buffer_size = size;
}
static ds_ctxt_t *
buffer_init(const char *root)
{
ds_ctxt_t *ctxt;
ds_buffer_ctxt_t *buffer_ctxt;
ctxt = my_malloc(sizeof(ds_ctxt_t) + sizeof(ds_buffer_ctxt_t),
MYF(MY_FAE));
buffer_ctxt = (ds_buffer_ctxt_t *) (ctxt + 1);
buffer_ctxt->buffer_size = DS_DEFAULT_BUFFER_SIZE;
ctxt->ptr = buffer_ctxt;
ctxt->root = my_strdup(root, MYF(MY_FAE));
return ctxt;
}
static ds_file_t *
buffer_open(ds_ctxt_t *ctxt, const char *path, MY_STAT *mystat)
{
ds_buffer_ctxt_t *buffer_ctxt;
ds_ctxt_t *pipe_ctxt;
ds_file_t *dst_file;
ds_file_t *file;
ds_buffer_file_t *buffer_file;
pipe_ctxt = ctxt->pipe_ctxt;
xb_a(pipe_ctxt != NULL);
dst_file = ds_open(pipe_ctxt, path, mystat);
if (dst_file == NULL) {
exit(EXIT_FAILURE);
}
buffer_ctxt = (ds_buffer_ctxt_t *) ctxt->ptr;
file = (ds_file_t *) my_malloc(sizeof(ds_file_t) +
sizeof(ds_buffer_file_t) +
buffer_ctxt->buffer_size,
MYF(MY_FAE));
buffer_file = (ds_buffer_file_t *) (file + 1);
buffer_file->dst_file = dst_file;
buffer_file->buf = (char *) (buffer_file + 1);
buffer_file->size = buffer_ctxt->buffer_size;
buffer_file->pos = 0;
file->path = dst_file->path;
file->ptr = buffer_file;
return file;
}
static int
buffer_write(ds_file_t *file, const void *buf, size_t len)
{
ds_buffer_file_t *buffer_file;
buffer_file = (ds_buffer_file_t *) file->ptr;
while (len > 0) {
if (buffer_file->pos + len > buffer_file->size) {
if (buffer_file->pos > 0) {
size_t bytes;
bytes = buffer_file->size - buffer_file->pos;
memcpy(buffer_file->buf + buffer_file->pos, buf,
bytes);
if (ds_write(buffer_file->dst_file,
buffer_file->buf,
buffer_file->size)) {
return 1;
}
buffer_file->pos = 0;
buf = (const char *) buf + bytes;
len -= bytes;
} else {
/* We don't have any buffered bytes, just write
the entire source buffer */
if (ds_write(buffer_file->dst_file, buf, len)) {
return 1;
}
break;
}
} else {
memcpy(buffer_file->buf + buffer_file->pos, buf, len);
buffer_file->pos += len;
break;
}
}
return 0;
}
static int
buffer_close(ds_file_t *file)
{
ds_buffer_file_t *buffer_file;
buffer_file = (ds_buffer_file_t *) file->ptr;
if (buffer_file->pos > 0) {
ds_write(buffer_file->dst_file, buffer_file->buf,
buffer_file->pos);
}
ds_close(buffer_file->dst_file);
MY_FREE(file);
return 0;
}
static void
buffer_deinit(ds_ctxt_t *ctxt)
{
MY_FREE(ctxt->root);
MY_FREE(ctxt);
}
|