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 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 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