/*

 * ind_block.c --- indirect block I/O routines

 *

 * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,

 *  2001, 2002, 2003, 2004, 2005 by  Theodore Ts'o.

 *

 * %Begin-Header%

 * This file may be redistributed under the terms of the GNU Library

 * General Public License, version 2.

 * %End-Header%

 */

#include "config.h"

#include <stdio.h>

#include <string.h>

#if HAVE_UNISTD_H

#include <unistd.h>

#endif

#include "ext2_fs.h"

#include "ext2fs.h"

errcode_t ext2fs_read_ind_block(ext2_filsys fs, blk_t blk, void *buf)

{

  errcode_t retval;

#ifdef WORDS_BIGENDIAN

  blk_t   *block_nr;

  int   i;

  int   limit = fs->blocksize >> 2;

#endif

  if ((fs->flags & EXT2_FLAG_IMAGE_FILE) &&

      (fs->io != fs->image_io))

    memset(buf, 0, fs->blocksize);

  else {

    retval = io_channel_read_blk(fs->io, blk, 1, buf);

    if (retval)

      return retval;

  }

#ifdef WORDS_BIGENDIAN

  block_nr = (blk_t *) buf;

  for (i = 0; i < limit; i++, block_nr++)

    *block_nr = ext2fs_swab32(*block_nr);

#endif

  return 0;

}

errcode_t ext2fs_write_ind_block(ext2_filsys fs, blk_t blk, void *buf)

{

#ifdef WORDS_BIGENDIAN

  blk_t   *block_nr;

  int   i;

  int   limit = fs->blocksize >> 2;

#endif

  if (fs->flags & EXT2_FLAG_IMAGE_FILE)

    return 0;

#ifdef WORDS_BIGENDIAN

  block_nr = (blk_t *) buf;

  for (i = 0; i < limit; i++, block_nr++)

    *block_nr = ext2fs_swab32(*block_nr);

#endif

  return io_channel_write_blk(fs->io, blk, 1, buf);

}