/*
vbr.c (09.11.10)
Volume Boot Record 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 .
*/
#include
#include
#include
#include "mkexfat.h"
off_t vbr_alignment(void)
{
return 1;
}
off_t vbr_size(void)
{
return 12 * SECTOR_SIZE(sb);
}
int vbr_write(struct exfat_dev* dev, off_t base)
{
uint32_t checksum;
le32_t* sector = malloc(SECTOR_SIZE(sb));
size_t i;
if (sector == NULL)
return errno;
if (exfat_write(dev, &sb, sizeof(struct exfat_super_block)) < 0)
{
free(sector);
return errno;
}
checksum = exfat_vbr_start_checksum(&sb, sizeof(struct exfat_super_block));
memset(sector, 0, SECTOR_SIZE(sb));
sector[SECTOR_SIZE(sb) / sizeof(sector[0]) - 1] = cpu_to_le32(0xaa550000);
for (i = 0; i < 8; i++)
{
if (exfat_write(dev, sector, SECTOR_SIZE(sb)) < 0)
{
free(sector);
return errno;
}
checksum = exfat_vbr_add_checksum(sector, SECTOR_SIZE(sb), checksum);
}
memset(sector, 0, SECTOR_SIZE(sb));
if (exfat_write(dev, sector, SECTOR_SIZE(sb)) < 0)
{
free(sector);
return errno;
}
checksum = exfat_vbr_add_checksum(sector, SECTOR_SIZE(sb), checksum);
if (exfat_write(dev, sector, SECTOR_SIZE(sb)) < 0)
{
free(sector);
return errno;
}
checksum = exfat_vbr_add_checksum(sector, SECTOR_SIZE(sb), checksum);
for (i = 0; i < SECTOR_SIZE(sb) / sizeof(sector[0]); i++)
sector[i] = cpu_to_le32(checksum);
if (exfat_write(dev, sector, SECTOR_SIZE(sb)) < 0)
{
free(sector);
return errno;
}
free(sector);
return 0;
}