3 Definitions of structures and constants used in exFAT file system.
5 Copyright (C) 2009, 2010 Andrew Nayenko
7 This program is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
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18 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #ifndef EXFATFS_H_INCLUDED
22 #define EXFATFS_H_INCLUDED
24 #include "byteorder.h"
26 typedef uint32_t cluster_t; /* cluster number */
28 #define EXFAT_FIRST_DATA_CLUSTER 2
30 #define EXFAT_CLUSTER_FREE 0 /* free cluster */
31 #define EXFAT_CLUSTER_BAD 0xfffffff7 /* cluster contains bad sector */
32 #define EXFAT_CLUSTER_END 0xffffffff /* final cluster of file or directory */
34 struct exfat_super_block
36 uint8_t jump[3]; /* 0x00 jmp and nop instructions */
37 uint8_t oem_name[8]; /* 0x03 "EXFAT " */
38 uint8_t __unused1[53]; /* 0x0B always 0 */
39 le64_t sector_start; /* 0x40 partition first sector */
40 le64_t sector_count; /* 0x48 partition sectors count */
41 le32_t fat_sector_start; /* 0x50 FAT first sector */
42 le32_t fat_sector_count; /* 0x54 FAT sectors count */
43 le32_t cluster_sector_start; /* 0x58 first cluster sector */
44 le32_t cluster_count; /* 0x5C total clusters count */
45 le32_t rootdir_cluster; /* 0x60 first cluster of the root dir */
46 le32_t volume_serial; /* 0x64 volume serial number */
47 struct /* 0x68 FS version */
53 le16_t volume_state; /* 0x6A volume state flags */
54 uint8_t sector_bits; /* 0x6C sector size as (1 << n) */
55 uint8_t spc_bits; /* 0x6D sectors per cluster as (1 << n) */
56 uint8_t fat_count; /* 0x6E always 1 */
57 uint8_t drive_no; /* 0x6F always 0x80 */
58 uint8_t allocated_percent; /* 0x70 percentage of allocated space */
59 uint8_t __unused2[397]; /* 0x71 always 0 */
60 le16_t boot_signature; /* the value of 0xAA55 */
62 __attribute__((__packed__));
64 #define EXFAT_ENTRY_VALID 0x80
65 #define EXFAT_ENTRY_CONTINUED 0x40
67 #define EXFAT_ENTRY_EOD (0x00)
68 #define EXFAT_ENTRY_BITMAP (0x01 | EXFAT_ENTRY_VALID)
69 #define EXFAT_ENTRY_UPCASE (0x02 | EXFAT_ENTRY_VALID)
70 #define EXFAT_ENTRY_LABEL (0x03 | EXFAT_ENTRY_VALID)
71 #define EXFAT_ENTRY_FILE (0x05 | EXFAT_ENTRY_VALID)
72 #define EXFAT_ENTRY_FILE_INFO (0x00 | EXFAT_ENTRY_VALID | EXFAT_ENTRY_CONTINUED)
73 #define EXFAT_ENTRY_FILE_NAME (0x01 | EXFAT_ENTRY_VALID | EXFAT_ENTRY_CONTINUED)
75 struct exfat_entry /* common container for all entries */
77 uint8_t type; /* any of EXFAT_ENTRY_xxx */
80 __attribute__((__packed__));
82 #define EXFAT_ENAME_MAX 15
84 struct exfat_entry_bitmap /* allocated clusters bitmap */
86 uint8_t type; /* EXFAT_ENTRY_BITMAP */
87 uint8_t __unknown1[19];
89 le64_t size; /* in bytes */
91 __attribute__((__packed__));
93 struct exfat_entry_upcase /* upper case translation table */
95 uint8_t type; /* EXFAT_ENTRY_UPCASE */
96 uint8_t __unknown1[3];
98 uint8_t __unknown2[12];
100 le64_t size; /* in bytes */
102 __attribute__((__packed__));
104 struct exfat_entry_label /* volume label */
106 uint8_t type; /* EXFAT_ENTRY_LABEL */
107 uint8_t length; /* number of characters */
108 le16_t name[EXFAT_ENAME_MAX]; /* in UTF-16LE */
110 __attribute__((__packed__));
112 #define EXFAT_ATTRIB_RO 0x01
113 #define EXFAT_ATTRIB_HIDDEN 0x02
114 #define EXFAT_ATTRIB_SYSTEM 0x04
115 #define EXFAT_ATTRIB_VOLUME 0x08
116 #define EXFAT_ATTRIB_DIR 0x10
117 #define EXFAT_ATTRIB_ARCH 0x20
119 struct exfat_entry_meta1 /* file or directory info (part 1) */
121 uint8_t type; /* EXFAT_ENTRY_FILE */
122 uint8_t continuations;
124 le16_t attrib; /* combination of EXFAT_ATTRIB_xxx */
126 le16_t crtime, crdate; /* creation date and time */
127 le16_t mtime, mdate; /* latest modification date and time */
128 le16_t atime, adate; /* latest access date and time */
129 uint8_t crtime_cs; /* creation time in cs (centiseconds) */
130 uint8_t mtime_cs; /* latest modification time in cs */
131 uint8_t __unknown2[10];
133 __attribute__((__packed__));
135 #define EXFAT_FLAG_ALWAYS1 (1u << 0)
136 #define EXFAT_FLAG_CONTIGUOUS (1u << 1)
138 struct exfat_entry_meta2 /* file or directory info (part 2) */
140 uint8_t type; /* EXFAT_ENTRY_FILE_INFO */
141 uint8_t flags; /* combination of EXFAT_FLAG_xxx */
146 le64_t real_size; /* in bytes, equals to size */
147 uint8_t __unknown3[4];
148 le32_t start_cluster;
149 le64_t size; /* in bytes, equals to real_size */
151 __attribute__((__packed__));
153 struct exfat_entry_name /* file or directory name */
155 uint8_t type; /* EXFAT_ENTRY_FILE_NAME */
157 le16_t name[EXFAT_ENAME_MAX]; /* in UTF-16LE */
159 __attribute__((__packed__));
161 #endif /* ifndef EXFATFS_H_INCLUDED */