1 /* Copyright (c) 2004, 2015, Oracle and/or its affiliates. All rights reserved.
2
3 This program is free software; you can redistribute it and/or modify
4 it under the terms of the GNU General Public License, version 2.0,
5 as published by the Free Software Foundation.
6
7 This program is also distributed with certain software (including
8 but not limited to OpenSSL) that is licensed under separate terms,
9 as designated in a particular file or component or in included license
10 documentation. The authors of MySQL hereby grant you an additional
11 permission to link the program and your derivative works with the
12 separately licensed software that they have included with MySQL.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License, version 2.0, for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software Foundation,
21 51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
22
23
24 /**
25 @file
26
27 @brief
28 Functions for discover of frm file from handler
29 */
30
31 #include "discover.h"
32 #include "mysqld.h"
33 #include "table.h"
34 #include <my_dir.h>
35 #include "my_sys.h"
36
37 #include "pfs_file_provider.h"
38 #include "mysql/psi/mysql_file.h"
39
40 /**
41 Read the contents of a .frm file.
42
43 frmdata and len are set to 0 on error.
44
45 @param name path to table-file "db/name"
46 @param frmdata frm data
47 @param len length of the read frmdata
48
49 @retval
50 0 ok
51 @retval
52 1 Could not open file
53 @retval
54 2 Could not stat file
55 @retval
56 3 Could not allocate data for read. Could not read file
57 */
58
readfrm(const char * name,uchar ** frmdata,size_t * len)59 int readfrm(const char *name, uchar **frmdata, size_t *len)
60 {
61 int error;
62 char index_file[FN_REFLEN];
63 File file;
64 size_t read_len;
65 uchar *read_data;
66 MY_STAT state;
67 DBUG_ENTER("readfrm");
68 DBUG_PRINT("enter",("name: '%s'",name));
69
70 *frmdata= NULL; // In case of errors
71 *len= 0;
72 error= 1;
73 if ((file= mysql_file_open(key_file_frm,
74 fn_format(index_file, name, "", reg_ext,
75 MY_UNPACK_FILENAME|MY_APPEND_EXT),
76 O_RDONLY | O_SHARE,
77 MYF(0))) < 0)
78 goto err_end;
79
80 // Get length of file
81 error= 2;
82 if (mysql_file_fstat(file, &state, MYF(0)))
83 goto err;
84 read_len= static_cast<size_t>(state.st_size);
85
86 // Read whole frm file
87 error= 3;
88 read_data= 0; // Nothing to free
89 if (read_string(file, &read_data, read_len))
90 goto err;
91
92 // Setup return data
93 *frmdata= read_data;
94 *len= read_len;
95 error= 0;
96
97 err:
98 if (file > 0)
99 (void) mysql_file_close(file, MYF(MY_WME));
100
101 err_end: /* Here when no file */
102 DBUG_RETURN (error);
103 } /* readfrm */
104
105
106 /*
107 Write the content of a frm data pointer
108 to a frm file.
109
110 @param name path to table-file "db/name"
111 @param frmdata frm data
112 @param len length of the frmdata
113
114 @retval
115 0 ok
116 @retval
117 2 Could not write file
118 */
119
writefrm(const char * name,const uchar * frmdata,size_t len)120 int writefrm(const char *name, const uchar *frmdata, size_t len)
121 {
122 File file;
123 char index_file[FN_REFLEN];
124 int error;
125 DBUG_ENTER("writefrm");
126 DBUG_PRINT("enter",("name: '%s' len: %lu ",name, (ulong) len));
127
128 error= 0;
129 if ((file= mysql_file_create(key_file_frm,
130 fn_format(index_file, name, "", reg_ext,
131 MY_UNPACK_FILENAME | MY_APPEND_EXT),
132 CREATE_MODE, O_RDWR | O_TRUNC,
133 MYF(MY_WME))) >= 0)
134 {
135 if (mysql_file_write(file, frmdata, len, MYF(MY_WME | MY_NABP)))
136 error= 2;
137 (void) mysql_file_close(file, MYF(0));
138 }
139 DBUG_RETURN(error);
140 } /* writefrm */
141
142
143
144
145
146