yaffs_packedtags1.c
1.46 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
/*
* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
*
* Copyright (C) 2002-2011 Aleph One Ltd.
* for Toby Churchill Ltd and Brightstar Engineering
*
* Created by Charles Manning <charles@aleph1.co.uk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include "yaffs_packedtags1.h"
#include "yportenv.h"
static const u8 all_ff[20] = {
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff
};
void yaffs_pack_tags1(struct yaffs_packed_tags1 *pt,
const struct yaffs_ext_tags *t)
{
pt->chunk_id = t->chunk_id;
pt->serial_number = t->serial_number;
pt->n_bytes = t->n_bytes;
pt->obj_id = t->obj_id;
pt->ecc = 0;
pt->deleted = (t->is_deleted) ? 0 : 1;
pt->unused_stuff = 0;
pt->should_be_ff = 0xffffffff;
}
void yaffs_unpack_tags1(struct yaffs_ext_tags *t,
const struct yaffs_packed_tags1 *pt)
{
if (memcmp(all_ff, pt, sizeof(struct yaffs_packed_tags1))) {
t->block_bad = 0;
if (pt->should_be_ff != 0xffffffff)
t->block_bad = 1;
t->chunk_used = 1;
t->obj_id = pt->obj_id;
t->chunk_id = pt->chunk_id;
t->n_bytes = pt->n_bytes;
t->ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
t->is_deleted = (pt->deleted) ? 0 : 1;
t->serial_number = pt->serial_number;
} else {
memset(t, 0, sizeof(struct yaffs_ext_tags));
}
}