/*
rootdir.c (09.11.10)
Root directory creation code.
Free exFAT implementation.
Copyright (C) 2011-2015 Andrew Nayenko
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "rootdir.h"
#include "uct.h"
#include "cbm.h"
#include "uctc.h"
#include <string.h>
static off_t rootdir_alignment(void)
{
return get_cluster_size();
}
static off_t rootdir_size(void)
{
return get_cluster_size();
}
static void init_label_entry(struct exfat_entry_label* label_entry)
{
memset(label_entry, 0, sizeof(struct exfat_entry_label));
label_entry->type = EXFAT_ENTRY_LABEL ^ EXFAT_ENTRY_VALID;
if (utf16_length(get_volume_label()) == 0)
return;
memcpy(label_entry->name, get_volume_label(),
EXFAT_ENAME_MAX * sizeof(le16_t));
label_entry->length = utf16_length(get_volume_label());
label_entry->type |= EXFAT_ENTRY_VALID;
}
static void init_bitmap_entry(struct exfat_entry_bitmap* bitmap_entry)
{
memset(bitmap_entry, 0, sizeof(struct exfat_entry_bitmap));
bitmap_entry->type = EXFAT_ENTRY_BITMAP;
bitmap_entry->start_cluster = cpu_to_le32(EXFAT_FIRST_DATA_CLUSTER);
bitmap_entry->size = cpu_to_le64(cbm.get_size());
}
static void init_upcase_entry(struct exfat_entry_upcase* upcase_entry)
{
size_t i;
uint32_t sum = 0;
for (i = 0; i < sizeof(upcase_table); i++)
sum = ((sum << 31) | (sum >> 1)) + upcase_table[i];
memset(upcase_entry, 0, sizeof(struct exfat_entry_upcase));
upcase_entry->type = EXFAT_ENTRY_UPCASE;
upcase_entry->checksum = cpu_to_le32(sum);
upcase_entry->start_cluster = cpu_to_le32(
(get_position(&uct) - get_position(&cbm)) / get_cluster_size() +
EXFAT_FIRST_DATA_CLUSTER);
upcase_entry->size = cpu_to_le64(sizeof(upcase_table));
}
static int rootdir_write(struct exfat_dev* dev)
{
struct exfat_entry_label label_entry;
struct exfat_entry_bitmap bitmap_entry;
struct exfat_entry_upcase upcase_entry;
init_label_entry(&label_entry);
init_bitmap_entry(&bitmap_entry);
init_upcase_entry(&upcase_entry);
if (exfat_write(dev, &label_entry, sizeof(struct exfat_entry)) < 0)
return 1;
if (exfat_write(dev, &bitmap_entry, sizeof(struct exfat_entry)) < 0)
return 1;
if (exfat_write(dev, &upcase_entry, sizeof(struct exfat_entry)) < 0)
return 1;
return 0;
}
const struct fs_object rootdir =
{
.get_alignment = rootdir_alignment,
.get_size = rootdir_size,
.write = rootdir_write,
};
