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/*
uct.c (09.11.10)
Upper Case Table creation code.
Copyright (C) 2009, 2010 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <unistd.h>
#include <errno.h>
#include "mkexfat.h"
#include "uctc.h"
off_t uct_alignment(void)
{
return CLUSTER_SIZE(sb);
}
off_t uct_size(void)
{
return sizeof(upcase_table);
}
static le32_t uct_checksum(void)
{
size_t i;
uint32_t sum = 0;
for (i = 0; i < sizeof(upcase_table); i++)
sum = ((sum << 31) | (sum >> 1)) + upcase_table[i];
return cpu_to_le32(sum);
}
int uct_write(off_t base, int fd)
{
if (write(fd, upcase_table, sizeof(upcase_table)) == -1)
return errno;
upcase_entry.checksum = uct_checksum();
upcase_entry.start_cluster = cpu_to_le32(OFFSET_TO_CLUSTER(base));
upcase_entry.size = cpu_to_le64(sizeof(upcase_table));
return 0;
}
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