dirblock.c revision e446d71838c8fde06e59bd4eb01de031825c6f2b 
1/*
2 * dirblock.c --- directory block routines.
3 *
4 * Copyright (C) 1995, 1996 Theodore Ts'o.
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Public
8 * License.
9 * %End-Header%
10 */
11
12#include <stdio.h>
13#if HAVE_UNISTD_H
14#include <unistd.h>
15#endif
16#include <string.h>
17#include <time.h>
18
19#if EXT2_FLAT_INCLUDES
20#include "ext2_fs.h"
21#else
22#include <linux/ext2_fs.h>
23#endif
24
25#include "ext2fs.h"
26
27errcode_t ext2fs_read_dir_block(ext2_filsys fs, blk_t block,
28				void *buf)
29{
30	errcode_t	retval;
31	char		*p, *end;
32	struct ext2_dir_entry *dirent;
33
34 	retval = io_channel_read_blk(fs->io, block, 1, buf);
35	if (retval)
36		return retval;
37	if ((fs->flags & (EXT2_FLAG_SWAP_BYTES|
38			  EXT2_FLAG_SWAP_BYTES_READ)) == 0)
39		return 0;
40	p = (char *) buf;
41	end = (char *) buf + fs->blocksize;
42	while (p < end-8) {
43		dirent = (struct ext2_dir_entry *) p;
44		dirent->inode = ext2fs_swab32(dirent->inode);
45		dirent->rec_len = ext2fs_swab16(dirent->rec_len);
46		dirent->name_len = ext2fs_swab16(dirent->name_len);
47		p += (dirent->rec_len < 8) ? 8 : dirent->rec_len;
48	}
49	return 0;
50}
51
52errcode_t ext2fs_write_dir_block(ext2_filsys fs, blk_t block,
53				 void *inbuf)
54{
55	errcode_t	retval;
56	char		*p, *end, *write_buf;
57	char		*buf = 0;
58	struct ext2_dir_entry *dirent;
59
60	if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
61	    (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)) {
62		retval = ext2fs_get_mem(fs->blocksize, (void **) &buf);
63		if (retval)
64			return retval;
65		write_buf = buf;
66		memcpy(buf, inbuf, fs->blocksize);
67		p = buf;
68		end = buf + fs->blocksize;
69		while (p < end) {
70			dirent = (struct ext2_dir_entry *) p;
71			p += (dirent->rec_len < 8) ? 8 : dirent->rec_len;
72			dirent->inode = ext2fs_swab32(dirent->inode);
73			dirent->rec_len = ext2fs_swab16(dirent->rec_len);
74			dirent->name_len = ext2fs_swab16(dirent->name_len);
75		}
76	} else
77		write_buf = (char *) inbuf;
78 	retval = io_channel_write_blk(fs->io, block, 1, write_buf);
79	if (buf)
80		ext2fs_free_mem((void **) &buf);
81	return retval;
82}
83
84
85