1 /* Copyright (c) 2004, 2010, 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 "sql_priv.h"
32 #include "unireg.h"
33 #include "discover.h"
34 #include <my_dir.h>
35
36 /**
37 Read the contents of a .frm file.
38
39 frmdata and len are set to 0 on error.
40
41 @param name path to table-file "db/name"
42 @param frmdata frm data
43 @param len length of the read frmdata
44
45 @retval
46 0 ok
47 @retval
48 1 Could not open file
49 @retval
50 2 Could not stat file
51 @retval
52 3 Could not allocate data for read. Could not read file
53 */
54
readfrm(const char * name,uchar ** frmdata,size_t * len)55 int readfrm(const char *name, uchar **frmdata, size_t *len)
56 {
57 int error;
58 char index_file[FN_REFLEN];
59 File file;
60 size_t read_len;
61 uchar *read_data;
62 MY_STAT state;
63 DBUG_ENTER("readfrm");
64 DBUG_PRINT("enter",("name: '%s'",name));
65
66 *frmdata= NULL; // In case of errors
67 *len= 0;
68 error= 1;
69 if ((file= mysql_file_open(key_file_frm,
70 fn_format(index_file, name, "", reg_ext,
71 MY_UNPACK_FILENAME|MY_APPEND_EXT),
72 O_RDONLY | O_SHARE,
73 MYF(0))) < 0)
74 goto err_end;
75
76 // Get length of file
77 error= 2;
78 if (mysql_file_fstat(file, &state, MYF(0)))
79 goto err;
80 read_len= state.st_size;
81
82 // Read whole frm file
83 error= 3;
84 read_data= 0; // Nothing to free
85 if (read_string(file, &read_data, read_len))
86 goto err;
87
88 // Setup return data
89 *frmdata= (uchar*) read_data;
90 *len= read_len;
91 error= 0;
92
93 err:
94 if (file > 0)
95 (void) mysql_file_close(file, MYF(MY_WME));
96
97 err_end: /* Here when no file */
98 DBUG_RETURN (error);
99 } /* readfrm */
100
101
102 /*
103 Write the content of a frm data pointer
104 to a frm file.
105
106 @param name path to table-file "db/name"
107 @param frmdata frm data
108 @param len length of the frmdata
109
110 @retval
111 0 ok
112 @retval
113 2 Could not write file
114 */
115
writefrm(const char * name,const uchar * frmdata,size_t len)116 int writefrm(const char *name, const uchar *frmdata, size_t len)
117 {
118 File file;
119 char index_file[FN_REFLEN];
120 int error;
121 DBUG_ENTER("writefrm");
122 DBUG_PRINT("enter",("name: '%s' len: %lu ",name, (ulong) len));
123
124 error= 0;
125 if ((file= mysql_file_create(key_file_frm,
126 fn_format(index_file, name, "", reg_ext,
127 MY_UNPACK_FILENAME | MY_APPEND_EXT),
128 CREATE_MODE, O_RDWR | O_TRUNC,
129 MYF(MY_WME))) >= 0)
130 {
131 if (mysql_file_write(file, frmdata, len, MYF(MY_WME | MY_NABP)))
132 error= 2;
133 (void) mysql_file_close(file, MYF(0));
134 }
135 DBUG_RETURN(error);
136 } /* writefrm */
137
138
139
140
141
142