1 /*
2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
3 *
4 * Copyright (C) 2002-2011 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
6 *
7 * Created by Charles Manning <charles@aleph1.co.uk>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include "yaffs_packedtags1.h"
15 #include "yportenv.h"
16
17 static const u8 all_ff[20] = {
18 0xff, 0xff, 0xff, 0xff,
19 0xff, 0xff, 0xff, 0xff,
20 0xff, 0xff, 0xff, 0xff,
21 0xff, 0xff, 0xff, 0xff,
22 0xff, 0xff, 0xff, 0xff
23 };
24
yaffs_pack_tags1(struct yaffs_packed_tags1 * pt,const struct yaffs_ext_tags * t)25 void yaffs_pack_tags1(struct yaffs_packed_tags1 *pt,
26 const struct yaffs_ext_tags *t)
27 {
28 pt->chunk_id = t->chunk_id;
29 pt->serial_number = t->serial_number;
30 pt->n_bytes = t->n_bytes;
31 pt->obj_id = t->obj_id;
32 pt->ecc = 0;
33 pt->deleted = (t->is_deleted) ? 0 : 1;
34 pt->unused_stuff = 0;
35 pt->should_be_ff = 0xffffffff;
36 }
37
yaffs_unpack_tags1(struct yaffs_ext_tags * t,const struct yaffs_packed_tags1 * pt)38 void yaffs_unpack_tags1(struct yaffs_ext_tags *t,
39 const struct yaffs_packed_tags1 *pt)
40 {
41
42 if (memcmp(all_ff, pt, sizeof(struct yaffs_packed_tags1))) {
43 t->block_bad = 0;
44 if (pt->should_be_ff != 0xffffffff)
45 t->block_bad = 1;
46 t->chunk_used = 1;
47 t->obj_id = pt->obj_id;
48 t->chunk_id = pt->chunk_id;
49 t->n_bytes = pt->n_bytes;
50 t->ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
51 t->is_deleted = (pt->deleted) ? 0 : 1;
52 t->serial_number = pt->serial_number;
53 } else {
54 memset(t, 0, sizeof(struct yaffs_ext_tags));
55 }
56 }
57