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