grub-savannah-mirror/include/grub/fat.h

/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 2000,2001,2002,2003,2004,2005,2007,2008,2009  Free Software Foundation, Inc.
 *
 *  GRUB 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.
 *
 *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef GRUB_FAT_H
#define GRUB_FAT_H	1

#include <grub/types.h>

struct grub_fat_bpb
{
  grub_uint8_t jmp_boot[3];
  grub_uint8_t oem_name[8];
  grub_uint16_t bytes_per_sector;
  grub_uint8_t sectors_per_cluster;
  grub_uint16_t num_reserved_sectors;
  grub_uint8_t num_fats;		/* 0x10 */
  grub_uint16_t num_root_entries;
  grub_uint16_t num_total_sectors_16;
  grub_uint8_t media;			/* 0x15 */
  grub_uint16_t sectors_per_fat_16;
  grub_uint16_t sectors_per_track;	/* 0x18 */
  grub_uint16_t num_heads;		/* 0x1A */
  grub_uint32_t num_hidden_sectors;	/* 0x1C */
  grub_uint32_t num_total_sectors_32;	/* 0x20 */
  union
  {
    struct
    {
      grub_uint8_t num_ph_drive;
      grub_uint8_t reserved;
      grub_uint8_t boot_sig;
      grub_uint32_t num_serial;
      grub_uint8_t label[11];
      grub_uint8_t fstype[8];
    } GRUB_PACKED fat12_or_fat16;
    struct
    {
      grub_uint32_t sectors_per_fat_32;
      grub_uint16_t extended_flags;
      grub_uint16_t fs_version;
      grub_uint32_t root_cluster;
      grub_uint16_t fs_info;
      grub_uint16_t backup_boot_sector;
      grub_uint8_t reserved[12];
      grub_uint8_t num_ph_drive;
      grub_uint8_t reserved1;
      grub_uint8_t boot_sig;
      grub_uint32_t num_serial;
      grub_uint8_t label[11];
      grub_uint8_t fstype[8];
    } GRUB_PACKED fat32;
  } GRUB_PACKED version_specific;
} GRUB_PACKED;

#ifdef GRUB_UTIL
#include <grub/disk.h>

grub_disk_addr_t
grub_fat_get_cluster_sector (grub_disk_t disk, grub_uint64_t *sec_per_lcn);
#endif

#endif