source: MondoRescue/branches/stable/mindi-busybox/e2fsprogs/ext2fs/ind_block.c @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 1.5 KB
Line 
1/*
2 * ind_block.c --- indirect block I/O routines
3 *
4 * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
5 *  2001, 2002, 2003, 2004, 2005 by  Theodore Ts'o.
6 *
7 * %Begin-Header%
8 * This file may be redistributed under the terms of the GNU Public
9 * License.
10 * %End-Header%
11 */
12
13#include <stdio.h>
14#include <string.h>
15#if HAVE_UNISTD_H
16#include <unistd.h>
17#endif
18
19#include "ext2_fs.h"
20#include "ext2fs.h"
21
22errcode_t ext2fs_read_ind_block(ext2_filsys fs, blk_t blk, void *buf)
23{
24    errcode_t   retval;
25#if BB_BIG_ENDIAN
26    blk_t       *block_nr;
27    int     i;
28    int     limit = fs->blocksize >> 2;
29#endif
30
31    if ((fs->flags & EXT2_FLAG_IMAGE_FILE) &&
32        (fs->io != fs->image_io))
33        memset(buf, 0, fs->blocksize);
34    else {
35        retval = io_channel_read_blk(fs->io, blk, 1, buf);
36        if (retval)
37            return retval;
38    }
39#if BB_BIG_ENDIAN
40    if (fs->flags & (EXT2_FLAG_SWAP_BYTES | EXT2_FLAG_SWAP_BYTES_READ)) {
41        block_nr = (blk_t *) buf;
42        for (i = 0; i < limit; i++, block_nr++)
43            *block_nr = ext2fs_swab32(*block_nr);
44    }
45#endif
46    return 0;
47}
48
49errcode_t ext2fs_write_ind_block(ext2_filsys fs, blk_t blk, void *buf)
50{
51#if BB_BIG_ENDIAN
52    blk_t       *block_nr;
53    int     i;
54    int     limit = fs->blocksize >> 2;
55#endif
56
57    if (fs->flags & EXT2_FLAG_IMAGE_FILE)
58        return 0;
59
60#if BB_BIG_ENDIAN
61    if (fs->flags & (EXT2_FLAG_SWAP_BYTES | EXT2_FLAG_SWAP_BYTES_WRITE)) {
62        block_nr = (blk_t *) buf;
63        for (i = 0; i < limit; i++, block_nr++)
64            *block_nr = ext2fs_swab32(*block_nr);
65    }
66#endif
67    return io_channel_write_blk(fs->io, blk, 1, buf);
68}
69
70
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