3 Root directory creation code.
5 Free exFAT implementation.
6 Copyright (C) 2011-2014 Andrew Nayenko
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation, Inc.,
20 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
29 static off_t rootdir_alignment(void)
31 return get_cluster_size();
34 static off_t rootdir_size(void)
36 return get_cluster_size();
39 static void init_label_entry(struct exfat_entry_label* label_entry)
41 memset(label_entry, 0, sizeof(struct exfat_entry_label));
42 label_entry->type = EXFAT_ENTRY_LABEL ^ EXFAT_ENTRY_VALID;
44 if (utf16_length(get_volume_label()) == 0)
47 memcpy(label_entry->name, get_volume_label(),
48 EXFAT_ENAME_MAX * sizeof(le16_t));
49 label_entry->length = utf16_length(get_volume_label());
50 label_entry->type |= EXFAT_ENTRY_VALID;
53 static void init_bitmap_entry(struct exfat_entry_bitmap* bitmap_entry)
55 memset(bitmap_entry, 0, sizeof(struct exfat_entry_bitmap));
56 bitmap_entry->type = EXFAT_ENTRY_BITMAP;
57 bitmap_entry->start_cluster = cpu_to_le32(EXFAT_FIRST_DATA_CLUSTER);
58 bitmap_entry->size = cpu_to_le64(cbm.get_size());
61 static void init_upcase_entry(struct exfat_entry_upcase* upcase_entry)
66 for (i = 0; i < sizeof(upcase_table); i++)
67 sum = ((sum << 31) | (sum >> 1)) + upcase_table[i];
69 memset(upcase_entry, 0, sizeof(struct exfat_entry_upcase));
70 upcase_entry->type = EXFAT_ENTRY_UPCASE;
71 upcase_entry->checksum = cpu_to_le32(sum);
72 upcase_entry->start_cluster = cpu_to_le32(
73 (get_position(&uct) - get_position(&cbm)) / get_cluster_size() +
74 EXFAT_FIRST_DATA_CLUSTER);
75 upcase_entry->size = cpu_to_le64(sizeof(upcase_table));
78 static int rootdir_write(struct exfat_dev* dev)
80 struct exfat_entry_label label_entry;
81 struct exfat_entry_bitmap bitmap_entry;
82 struct exfat_entry_upcase upcase_entry;
84 init_label_entry(&label_entry);
85 init_bitmap_entry(&bitmap_entry);
86 init_upcase_entry(&upcase_entry);
88 if (exfat_write(dev, &label_entry, sizeof(struct exfat_entry)) < 0)
90 if (exfat_write(dev, &bitmap_entry, sizeof(struct exfat_entry)) < 0)
92 if (exfat_write(dev, &upcase_entry, sizeof(struct exfat_entry)) < 0)
97 const struct fs_object rootdir =
99 .get_alignment = rootdir_alignment,
100 .get_size = rootdir_size,
101 .write = rootdir_write,