LinuxGUI/Ventoy2Disk/Lib/exfat/src/libexfat/exfatfs.h

   1 /*
   2         exfatfs.h (29.08.09)
   3         Definitions of structures and constants used in exFAT file system.
   4
   5         Free exFAT implementation.
   6         Copyright (C) 2010-2018  Andrew Nayenko
   7
   8         This program is free software; you can redistribute it and/or modify
   9         it under the terms of the GNU General Public License as published by
  10         the Free Software Foundation, either version 2 of the License, or
  11         (at your option) any later version.
  12
  13         This program is distributed in the hope that it will be useful,
  14         but WITHOUT ANY WARRANTY; without even the implied warranty of
  15         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16         GNU General Public License for more details.
  17
  18         You should have received a copy of the GNU General Public License along
  19         with this program; if not, write to the Free Software Foundation, Inc.,
  20         51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21 */
  22
  23 #ifndef EXFATFS_H_INCLUDED
  24 #define EXFATFS_H_INCLUDED
  25
  26 #include "byteorder.h"
  27 #include "compiler.h"
  28
  29 typedef uint32_t cluster_t;             /* cluster number */
  30
  31 #define EXFAT_FIRST_DATA_CLUSTER 2
  32 #define EXFAT_LAST_DATA_CLUSTER 0xfffffff6
  33
  34 #define EXFAT_CLUSTER_FREE         0 /* free cluster */
  35 #define EXFAT_CLUSTER_BAD 0xfffffff7 /* cluster contains bad sector */
  36 #define EXFAT_CLUSTER_END 0xffffffff /* final cluster of file or directory */
  37
  38 #define EXFAT_STATE_MOUNTED 2
  39
  40 struct exfat_super_block
  41 {
  42         uint8_t jump[3];                                /* 0x00 jmp and nop instructions */
  43         uint8_t oem_name[8];                    /* 0x03 "EXFAT   " */
  44         uint8_t __unused1[53];                  /* 0x0B always 0 */
  45         le64_t sector_start;                    /* 0x40 partition first sector */
  46         le64_t sector_count;                    /* 0x48 partition sectors count */
  47         le32_t fat_sector_start;                /* 0x50 FAT first sector */
  48         le32_t fat_sector_count;                /* 0x54 FAT sectors count */
  49         le32_t cluster_sector_start;    /* 0x58 first cluster sector */
  50         le32_t cluster_count;                   /* 0x5C total clusters count */
  51         le32_t rootdir_cluster;                 /* 0x60 first cluster of the root dir */
  52         le32_t volume_serial;                   /* 0x64 volume serial number */
  53         struct                                                  /* 0x68 FS version */
  54         {
  55                 uint8_t minor;
  56                 uint8_t major;
  57         }
  58         version;
  59         le16_t volume_state;                    /* 0x6A volume state flags */
  60         uint8_t sector_bits;                    /* 0x6C sector size as (1 << n) */
  61         uint8_t spc_bits;                               /* 0x6D sectors per cluster as (1 << n) */
  62         uint8_t fat_count;                              /* 0x6E always 1 */
  63         uint8_t drive_no;                               /* 0x6F always 0x80 */
  64         uint8_t allocated_percent;              /* 0x70 percentage of allocated space */
  65         uint8_t __unused2[397];                 /* 0x71 always 0 */
  66         le16_t boot_signature;                  /* the value of 0xAA55 */
  67 }
  68 PACKED;
  69 STATIC_ASSERT(sizeof(struct exfat_super_block) == 512);
  70
  71 #define EXFAT_ENTRY_VALID     0x80
  72 #define EXFAT_ENTRY_CONTINUED 0x40
  73 #define EXFAT_ENTRY_OPTIONAL  0x20
  74
  75 #define EXFAT_ENTRY_BITMAP    (0x01 | EXFAT_ENTRY_VALID)
  76 #define EXFAT_ENTRY_UPCASE    (0x02 | EXFAT_ENTRY_VALID)
  77 #define EXFAT_ENTRY_LABEL     (0x03 | EXFAT_ENTRY_VALID)
  78 #define EXFAT_ENTRY_FILE      (0x05 | EXFAT_ENTRY_VALID)
  79 #define EXFAT_ENTRY_FILE_INFO (0x00 | EXFAT_ENTRY_VALID | EXFAT_ENTRY_CONTINUED)
  80 #define EXFAT_ENTRY_FILE_NAME (0x01 | EXFAT_ENTRY_VALID | EXFAT_ENTRY_CONTINUED)
  81 #define EXFAT_ENTRY_FILE_TAIL (0x00 | EXFAT_ENTRY_VALID \
  82                                     | EXFAT_ENTRY_CONTINUED \
  83                                     | EXFAT_ENTRY_OPTIONAL)
  84
  85 struct exfat_entry                                      /* common container for all entries */
  86 {
  87         uint8_t type;                                   /* any of EXFAT_ENTRY_xxx */
  88         uint8_t data[31];
  89 }
  90 PACKED;
  91 STATIC_ASSERT(sizeof(struct exfat_entry) == 32);
  92
  93 #define EXFAT_ENAME_MAX 15
  94
  95 struct exfat_entry_bitmap                       /* allocated clusters bitmap */
  96 {
  97         uint8_t type;                                   /* EXFAT_ENTRY_BITMAP */
  98         uint8_t __unknown1[19];
  99         le32_t start_cluster;
 100         le64_t size;                                    /* in bytes */
 101 }
 102 PACKED;
 103 STATIC_ASSERT(sizeof(struct exfat_entry_bitmap) == 32);
 104
 105 #define EXFAT_UPCASE_CHARS 0x10000
 106
 107 struct exfat_entry_upcase                       /* upper case translation table */
 108 {
 109         uint8_t type;                                   /* EXFAT_ENTRY_UPCASE */
 110         uint8_t __unknown1[3];
 111         le32_t checksum;
 112         uint8_t __unknown2[12];
 113         le32_t start_cluster;
 114         le64_t size;                                    /* in bytes */
 115 }
 116 PACKED;
 117 STATIC_ASSERT(sizeof(struct exfat_entry_upcase) == 32);
 118
 119 struct exfat_entry_label                        /* volume label */
 120 {
 121         uint8_t type;                                   /* EXFAT_ENTRY_LABEL */
 122         uint8_t length;                                 /* number of characters */
 123         le16_t name[EXFAT_ENAME_MAX];   /* in UTF-16LE */
 124 }
 125 PACKED;
 126 STATIC_ASSERT(sizeof(struct exfat_entry_label) == 32);
 127
 128 #define EXFAT_ATTRIB_RO     0x01
 129 #define EXFAT_ATTRIB_HIDDEN 0x02
 130 #define EXFAT_ATTRIB_SYSTEM 0x04
 131 #define EXFAT_ATTRIB_VOLUME 0x08
 132 #define EXFAT_ATTRIB_DIR    0x10
 133 #define EXFAT_ATTRIB_ARCH   0x20
 134
 135 struct exfat_entry_meta1                        /* file or directory info (part 1) */
 136 {
 137         uint8_t type;                                   /* EXFAT_ENTRY_FILE */
 138         uint8_t continuations;
 139         le16_t checksum;
 140         le16_t attrib;                                  /* combination of EXFAT_ATTRIB_xxx */
 141         le16_t __unknown1;
 142         le16_t crtime, crdate;                  /* creation date and time */
 143         le16_t mtime, mdate;                    /* latest modification date and time */
 144         le16_t atime, adate;                    /* latest access date and time */
 145         uint8_t crtime_cs;                              /* creation time in cs (centiseconds) */
 146         uint8_t mtime_cs;                               /* latest modification time in cs */
 147         uint8_t __unknown2[10];
 148 }
 149 PACKED;
 150 STATIC_ASSERT(sizeof(struct exfat_entry_meta1) == 32);
 151
 152 #define EXFAT_FLAG_ALWAYS1              (1u << 0)
 153 #define EXFAT_FLAG_CONTIGUOUS   (1u << 1)
 154
 155 struct exfat_entry_meta2                        /* file or directory info (part 2) */
 156 {
 157         uint8_t type;                                   /* EXFAT_ENTRY_FILE_INFO */
 158         uint8_t flags;                                  /* combination of EXFAT_FLAG_xxx */
 159         uint8_t __unknown1;
 160         uint8_t name_length;
 161         le16_t name_hash;
 162         le16_t __unknown2;
 163         le64_t valid_size;                              /* in bytes, less or equal to size */
 164         uint8_t __unknown3[4];
 165         le32_t start_cluster;
 166         le64_t size;                                    /* in bytes */
 167 }
 168 PACKED;
 169 STATIC_ASSERT(sizeof(struct exfat_entry_meta2) == 32);
 170
 171 struct exfat_entry_name                         /* file or directory name */
 172 {
 173         uint8_t type;                                   /* EXFAT_ENTRY_FILE_NAME */
 174         uint8_t __unknown;
 175         le16_t name[EXFAT_ENAME_MAX];   /* in UTF-16LE */
 176 }
 177 PACKED;
 178 STATIC_ASSERT(sizeof(struct exfat_entry_name) == 32);
 179
 180 #endif /* ifndef EXFATFS_H_INCLUDED */