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103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
/*
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rootdir.c (09.11.10)
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Root directory creation code.
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Free exFAT implementation.
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Copyright (C) 2011-2018 Andrew Nayenko
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "rootdir.h"
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#include "uct.h"
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#include "cbm.h"
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#include "uctc.h"
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#include <string.h>
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static off_t rootdir_alignment(void)
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{
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return get_cluster_size();
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}
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static off_t rootdir_size(void)
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{
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return get_cluster_size();
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}
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static void init_label_entry(struct exfat_entry_label* label_entry)
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{
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memset(label_entry, 0, sizeof(struct exfat_entry_label));
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label_entry->type = EXFAT_ENTRY_LABEL ^ EXFAT_ENTRY_VALID;
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if (utf16_length(get_volume_label()) == 0)
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return;
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memcpy(label_entry->name, get_volume_label(),
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EXFAT_ENAME_MAX * sizeof(le16_t));
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label_entry->length = utf16_length(get_volume_label());
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label_entry->type |= EXFAT_ENTRY_VALID;
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}
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static void init_bitmap_entry(struct exfat_entry_bitmap* bitmap_entry)
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{
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memset(bitmap_entry, 0, sizeof(struct exfat_entry_bitmap));
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bitmap_entry->type = EXFAT_ENTRY_BITMAP;
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bitmap_entry->start_cluster = cpu_to_le32(EXFAT_FIRST_DATA_CLUSTER);
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bitmap_entry->size = cpu_to_le64(cbm.get_size());
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}
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static void init_upcase_entry(struct exfat_entry_upcase* upcase_entry)
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{
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size_t i;
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uint32_t sum = 0;
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for (i = 0; i < sizeof(upcase_table); i++)
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sum = ((sum << 31) | (sum >> 1)) + upcase_table[i];
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memset(upcase_entry, 0, sizeof(struct exfat_entry_upcase));
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upcase_entry->type = EXFAT_ENTRY_UPCASE;
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upcase_entry->checksum = cpu_to_le32(sum);
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upcase_entry->start_cluster = cpu_to_le32(
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(get_position(&uct) - get_position(&cbm)) / get_cluster_size() +
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EXFAT_FIRST_DATA_CLUSTER);
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upcase_entry->size = cpu_to_le64(sizeof(upcase_table));
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}
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static int rootdir_write(struct exfat_dev* dev)
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{
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struct exfat_entry_label label_entry;
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struct exfat_entry_bitmap bitmap_entry;
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struct exfat_entry_upcase upcase_entry;
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init_label_entry(&label_entry);
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init_bitmap_entry(&bitmap_entry);
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init_upcase_entry(&upcase_entry);
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if (exfat_write(dev, &label_entry, sizeof(struct exfat_entry)) < 0)
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return 1;
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if (exfat_write(dev, &bitmap_entry, sizeof(struct exfat_entry)) < 0)
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return 1;
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if (exfat_write(dev, &upcase_entry, sizeof(struct exfat_entry)) < 0)
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return 1;
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return 0;
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}
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const struct fs_object rootdir =
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{
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.get_alignment = rootdir_alignment,
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.get_size = rootdir_size,
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.write = rootdir_write,
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};
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