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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef FAT_H
#define FAT_H
#include <stdint.h>
#include "fatblock.h"
typedef uint32_t cluster_t;
typedef uint64_t sector_t;
typedef cluster_t fat_entry_t;
struct fat_boot_sector {
uint8_t jump[3];
char name[8];
uint16_t sector_size;
uint8_t sectors_per_cluster;
uint16_t reserved_sectors;
uint8_t fats;
uint16_t rootdir_size;
uint16_t sectors16;
uint8_t media_desc;
uint16_t fat_sectors16;
uint16_t sectors_per_track;
uint16_t heads;
uint32_t hidden_sectors;
uint32_t sectors32;
uint32_t fat_sectors32;
uint16_t fat_flags;
uint16_t version;
cluster_t rootdir_start;
uint16_t fs_info_sector;
uint16_t backup_boot_sector;
uint8_t reserved1[12];
uint8_t phys_drive;
uint8_t reserved2;
uint8_t ext_boot_sig;
uint32_t serial;
char vol_label[11];
char type[8];
char boot_code[420];
uint8_t boot_sig[2];
} __attribute__((__packed__));
#define FAT_MEDIA_DESC_FIXED 0xF8
#define FAT_PHYS_DRIVE_REMOVABLE 0x00
#define FAT_PHYS_DRIVE_FIXED 0x80
#define FAT_EXT_BOOT_SIG 0x29
extern const char FAT_BOOT_SIG[2];
extern const char FAT_INFO_SIG1[4];
extern const char FAT_INFO_SIG2[4];
#define FAT_INFO_SIG3 FAT_BOOT_SIG
struct fat_info_sector {
char info_sig1[4];
char reserved1[480];
char info_sig2[4];
cluster_t free_clusters;
cluster_t last_cluster;
char reserved2[14];
char info_sig3[2];
} __attribute__((__packed__));
struct fat_bootinfo {
struct fat_boot_sector boot;
struct fat_info_sector info;
} __attribute__((__packed__));
struct fat_dirent {
char name[11];
uint8_t attr;
uint8_t reserved;
uint8_t ctime_ms;
uint16_t ctime;
uint16_t cdate;
uint16_t adate;
uint16_t first_cluster_hi;
uint16_t mtime;
uint16_t mdate;
uint16_t first_cluster_lo;
uint32_t size;
} __attribute__((__packed__));
#define FAT_ATTR_READONLY 0x01
#define FAT_ATTR_HIDDEN 0x02
#define FAT_ATTR_SYSTEM 0x04
#define FAT_ATTR_VOLLABEL 0x08
#define FAT_ATTR_SUBDIR 0x10
#define FAT_ATTR_ARCHIVE 0x20
#define FAT_ATTR_DEVICE 0x40
#define FAT_ENTRY_FREE 0x00000000
#define FAT_ENTRY_BAD 0x0FFFFFF7
#define FAT_ENTRY_EOC 0x0FFFFFF8
#define FAT_SECTOR_SIZE 512
#define FAT_CLUSTER_ZERO 2
#define FAT_ENTRIES_PER_SECTOR ((SECTOR_SIZE) / (sizeof(fat_entry_t)))
void fat_dirent_set_first_cluster(struct fat_dirent *de, cluster_t cluster);
void fat_dirent_set(struct fat_dirent *de,
char *name, uint8_t attr,
cluster_t first_cluster, uint32_t size);
#endif
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