+++ /dev/null
-/*
- fat.c (09.11.10)
- File Allocation Table creation code.
-
- Free exFAT implementation.
- Copyright (C) 2011-2018 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 "fat.h"
-#include "cbm.h"
-#include "uct.h"
-#include "rootdir.h"
-#include <unistd.h>
-
-static off_t fat_alignment(void)
-{
- return (off_t) 128 * get_sector_size();
-}
-
-static off_t fat_size(void)
-{
- return get_volume_size() / get_cluster_size() * sizeof(cluster_t);
-}
-
-static cluster_t fat_write_entry(struct exfat_dev* dev, cluster_t cluster,
- cluster_t value)
-{
- le32_t fat_entry = cpu_to_le32(value);
- if (exfat_write(dev, &fat_entry, sizeof(fat_entry)) < 0)
- {
- exfat_error("failed to write FAT entry 0x%x", value);
- return 0;
- }
- return cluster + 1;
-}
-
-static cluster_t fat_write_entries(struct exfat_dev* dev, cluster_t cluster,
- uint64_t length)
-{
- cluster_t end = cluster + DIV_ROUND_UP(length, get_cluster_size());
-
- while (cluster < end - 1)
- {
- cluster = fat_write_entry(dev, cluster, cluster + 1);
- if (cluster == 0)
- return 0;
- }
- return fat_write_entry(dev, cluster, EXFAT_CLUSTER_END);
-}
-
-static int fat_write(struct exfat_dev* dev)
-{
- cluster_t c = 0;
-
- if (!(c = fat_write_entry(dev, c, 0xfffffff8))) /* media type */
- return 1;
- if (!(c = fat_write_entry(dev, c, 0xffffffff))) /* some weird constant */
- return 1;
- if (!(c = fat_write_entries(dev, c, cbm.get_size())))
- return 1;
- if (!(c = fat_write_entries(dev, c, uct.get_size())))
- return 1;
- if (!(c = fat_write_entries(dev, c, rootdir.get_size())))
- return 1;
-
- return 0;
-}
-
-const struct fs_object fat =
-{
- .get_alignment = fat_alignment,
- .get_size = fat_size,
- .write = fat_write,
-};