discover.cpp
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:3k
- /* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
- 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; either version 2 of the License, or
- (at your option) any later version.
- 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 */
- /* Functions for discover of frm file from handler */
- #include "mysql_priv.h"
- #include <my_dir.h>
- /*
- Read the contents of a .frm file
- SYNOPSIS
- readfrm()
- name path to table-file "db/name"
- frmdata frm data
- len length of the read frmdata
- RETURN VALUES
- 0 ok
- 1 Could not open file
- 2 Could not stat file
- 3 Could not allocate data for read
- Could not read file
- frmdata and len are set to 0 on error
- */
- int readfrm(const char *name,
- const void **frmdata, uint *len)
- {
- int error;
- char index_file[FN_REFLEN];
- File file;
- ulong read_len;
- char *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=my_open(fn_format(index_file,name,"",reg_ext,4),
- O_RDONLY | O_SHARE,
- MYF(0))) < 0)
- goto err_end;
-
- // Get length of file
- error= 2;
- if (my_fstat(file, &state, MYF(0)))
- goto err;
- read_len= state.st_size;
- // Read whole frm file
- error= 3;
- read_data= 0;
- if (read_string(file, &read_data, read_len))
- goto err;
- // Setup return data
- *frmdata= (void*) read_data;
- *len= read_len;
- error= 0;
-
- err:
- if (file > 0)
- VOID(my_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
- SYNOPSIS
- writefrm()
- name path to table-file "db/name"
- frmdata frm data
- len length of the frmdata
- RETURN VALUES
- 0 ok
- 2 Could not write file
- */
- int writefrm(const char *name, const void *frmdata, uint len)
- {
- File file;
- char index_file[FN_REFLEN];
- int error;
- DBUG_ENTER("writefrm");
- DBUG_PRINT("enter",("name: '%s' len: %d ",name,len));
- //DBUG_DUMP("frmdata", (char*)frmdata, len);
- error= 0;
- if ((file=my_create(fn_format(index_file,name,"",reg_ext,4),
- CREATE_MODE,O_RDWR | O_TRUNC,MYF(MY_WME))) >= 0)
- {
- if (my_write(file,(byte*)frmdata,len,MYF(MY_WME | MY_NABP)))
- error= 2;
- }
- VOID(my_close(file,MYF(0)));
- DBUG_RETURN(error);
- } /* writefrm */