mirror of
https://github.com/sheumann/hush.git
synced 2024-08-15 02:29:00 +00:00
72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* 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 Public
|
|
* License.
|
|
* %End-Header%
|
|
*/
|
|
|
|
#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;
|
|
#if BB_BIG_ENDIAN
|
|
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;
|
|
}
|
|
#if BB_BIG_ENDIAN
|
|
if (fs->flags & (EXT2_FLAG_SWAP_BYTES | EXT2_FLAG_SWAP_BYTES_READ)) {
|
|
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)
|
|
{
|
|
#if BB_BIG_ENDIAN
|
|
blk_t *block_nr;
|
|
int i;
|
|
int limit = fs->blocksize >> 2;
|
|
#endif
|
|
|
|
if (fs->flags & EXT2_FLAG_IMAGE_FILE)
|
|
return 0;
|
|
|
|
#if BB_BIG_ENDIAN
|
|
if (fs->flags & (EXT2_FLAG_SWAP_BYTES | EXT2_FLAG_SWAP_BYTES_WRITE)) {
|
|
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);
|
|
}
|
|
|
|
|