X-Git-Url: https://git.sven.stormbind.net/?p=sven%2Ffuse-exfat.git;a=blobdiff_plain;f=mkfs%2Fvbr.c;fp=mkfs%2Fvbr.c;h=0000000000000000000000000000000000000000;hp=e40081fa9fb213cc036dbf4f726f93d9325716aa;hb=aa03032454625361e1abc1cf80f4db0492ae5b81;hpb=b8b3f5e8940dd7a0ce964dfecd8c6c6139dab421 diff --git a/mkfs/vbr.c b/mkfs/vbr.c deleted file mode 100644 index e40081f..0000000 --- a/mkfs/vbr.c +++ /dev/null @@ -1,148 +0,0 @@ -/* - vbr.c (09.11.10) - Volume Boot Record 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 "vbr.h" -#include "fat.h" -#include "cbm.h" -#include "uct.h" -#include "rootdir.h" -#include - -static off_t vbr_alignment(void) -{ - return get_sector_size(); -} - -static off_t vbr_size(void) -{ - return 12 * get_sector_size(); -} - -static void init_sb(struct exfat_super_block* sb) -{ - uint32_t clusters_max; - uint32_t fat_sectors; - - clusters_max = get_volume_size() / get_cluster_size(); - fat_sectors = DIV_ROUND_UP((off_t) clusters_max * sizeof(cluster_t), - get_sector_size()); - - memset(sb, 0, sizeof(struct exfat_super_block)); - sb->jump[0] = 0xeb; - sb->jump[1] = 0x76; - sb->jump[2] = 0x90; - memcpy(sb->oem_name, "EXFAT ", sizeof(sb->oem_name)); - sb->sector_start = cpu_to_le64(get_first_sector()); - sb->sector_count = cpu_to_le64(get_volume_size() / get_sector_size()); - sb->fat_sector_start = cpu_to_le32( - fat.get_alignment() / get_sector_size()); - sb->fat_sector_count = cpu_to_le32(ROUND_UP( - le32_to_cpu(sb->fat_sector_start) + fat_sectors, - 1 << get_spc_bits()) - - le32_to_cpu(sb->fat_sector_start)); - sb->cluster_sector_start = cpu_to_le32( - get_position(&cbm) / get_sector_size()); - sb->cluster_count = cpu_to_le32(clusters_max - - ((le32_to_cpu(sb->fat_sector_start) + - le32_to_cpu(sb->fat_sector_count)) >> get_spc_bits())); - sb->rootdir_cluster = cpu_to_le32( - (get_position(&rootdir) - get_position(&cbm)) / get_cluster_size() - + EXFAT_FIRST_DATA_CLUSTER); - sb->volume_serial = cpu_to_le32(get_volume_serial()); - sb->version.major = 1; - sb->version.minor = 0; - sb->volume_state = cpu_to_le16(0); - sb->sector_bits = get_sector_bits(); - sb->spc_bits = get_spc_bits(); - sb->fat_count = 1; - sb->drive_no = 0x80; - sb->allocated_percent = 0; - sb->boot_signature = cpu_to_le16(0xaa55); -} - -static int vbr_write(struct exfat_dev* dev) -{ - struct exfat_super_block sb; - uint32_t checksum; - le32_t* sector = malloc(get_sector_size()); - size_t i; - - if (sector == NULL) - { - exfat_error("failed to allocate sector-sized block of memory"); - return 1; - } - - init_sb(&sb); - if (exfat_write(dev, &sb, sizeof(struct exfat_super_block)) < 0) - { - free(sector); - exfat_error("failed to write super block sector"); - return 1; - } - checksum = exfat_vbr_start_checksum(&sb, sizeof(struct exfat_super_block)); - - memset(sector, 0, get_sector_size()); - sector[get_sector_size() / sizeof(sector[0]) - 1] = - cpu_to_le32(0xaa550000); - for (i = 0; i < 8; i++) - { - if (exfat_write(dev, sector, get_sector_size()) < 0) - { - free(sector); - exfat_error("failed to write a sector with boot signature"); - return 1; - } - checksum = exfat_vbr_add_checksum(sector, get_sector_size(), checksum); - } - - memset(sector, 0, get_sector_size()); - for (i = 0; i < 2; i++) - { - if (exfat_write(dev, sector, get_sector_size()) < 0) - { - free(sector); - exfat_error("failed to write an empty sector"); - return 1; - } - checksum = exfat_vbr_add_checksum(sector, get_sector_size(), checksum); - } - - for (i = 0; i < get_sector_size() / sizeof(sector[0]); i++) - sector[i] = cpu_to_le32(checksum); - if (exfat_write(dev, sector, get_sector_size()) < 0) - { - free(sector); - exfat_error("failed to write checksum sector"); - return 1; - } - - free(sector); - return 0; -} - -const struct fs_object vbr = -{ - .get_alignment = vbr_alignment, - .get_size = vbr_size, - .write = vbr_write, -};