~drizzle-trunk/drizzle/development

/* Copyright (C) 2004 MySQL 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; 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 */

/**

  @file

  @brief

  Functions for discover of frm file from handler

*/

#include "mysql_priv.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;

  struct stat state;  

  *frmdata= NULL;      // In case of errors

  *len= 0;

  error= 1;

  if ((file=my_open(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 (fstat(file, &state))

    goto err;

  read_len= 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(my_close(file,MYF(MY_WME)));

 err_end:		      /* Here when no file */

  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;

  error= 0;

  if ((file=my_create(fn_format(index_file,name,"",reg_ext,

                      MY_UNPACK_FILENAME|MY_APPEND_EXT),

		      CREATE_MODE,O_RDWR | O_TRUNC,MYF(MY_WME))) >= 0)

  {

    if (my_write(file, frmdata, len,MYF(MY_WME | MY_NABP)))

      error= 2;

    VOID(my_close(file,MYF(0)));

  }

  return(error);

} /* writefrm */