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/* Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/**
@file
@brief
Functions for discover of frm file from handler
*/
#include "sql_priv.h"
#include "unireg.h"
#include "discover.h"
#include <my_dir.h>
/**
Read the contents of a .frm file.
frmdata and len are set to 0 on error.
@param name path to table-file "db/name"
@param frmdata frm data
@param len length of the read frmdata
@retval
0 ok
@retval
1 Could not open file
@retval
2 Could not stat file
@retval
3 Could not allocate data for read. Could not read file
*/
int readfrm(const char *name, uchar **frmdata, size_t *len)
{
int error;
char index_file[FN_REFLEN];
File file;
size_t read_len;
uchar *read_data;
MY_STAT state;
DBUG_ENTER("readfrm");
DBUG_PRINT("enter",("name: '%s'",name));
*frmdata= NULL; // In case of errors
*len= 0;
error= 1;
if ((file= mysql_file_open(key_file_frm,
fn_format(index_file, name, "", reg_ext,
MY_UNPACK_FILENAME|MY_APPEND_EXT),
O_RDONLY | O_SHARE,
MYF(0))) < 0)
goto err_end;
// Get length of file
error= 2;
if (mysql_file_fstat(file, &state, MYF(0)))
goto err;
read_len= (size_t)state.st_size;
// Read whole frm file
error= 3;
read_data= 0; // Nothing to free
if (read_string(file, &read_data, read_len))
goto err;
// Setup return data
*frmdata= (uchar*) read_data;
*len= read_len;
error= 0;
err:
if (file > 0)
(void) mysql_file_close(file, MYF(MY_WME));
err_end: /* Here when no file */
DBUG_RETURN (error);
} /* readfrm */
/*
Write the content of a frm data pointer
to a frm file.
@param name path to table-file "db/name"
@param frmdata frm data
@param len length of the frmdata
@retval
0 ok
@retval
2 Could not write file
*/
int writefrm(const char *name, const uchar *frmdata, size_t len)
{
File file;
char index_file[FN_REFLEN];
int error;
DBUG_ENTER("writefrm");
DBUG_PRINT("enter",("name: '%s' len: %lu ",name, (ulong) len));
error= 0;
if ((file= mysql_file_create(key_file_frm,
fn_format(index_file, name, "", reg_ext,
MY_UNPACK_FILENAME | MY_APPEND_EXT),
CREATE_MODE, O_RDWR | O_TRUNC,
MYF(MY_WME))) >= 0)
{
if (mysql_file_write(file, frmdata, len, MYF(MY_WME | MY_NABP)))
error= 2;
(void) mysql_file_close(file, MYF(0));
}
DBUG_RETURN(error);
} /* writefrm */
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