rom/filesys/fat/fat_struct.h

   1 /*
   2  * fat-handler - FAT12/16/32 filesystem handler
   3  *
   4  * Copyright © 2006 Marek Szyprowski
   5  * Copyright © 2007-2015 The AROS Development Team
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the same terms as AROS itself.
   9  *
  10  * $Id$
  11  */
  12
  13 #define FAT_MAX_SHORT_NAME 11
  14 #define FAT_MAX_LONG_FILENAME 0xff
  15
  16 struct FATEBPB
  17 {
  18     UBYTE bs_drvnum;
  19     UBYTE bs_reserved1;
  20     UBYTE bs_bootsig;
  21     ULONG bs_volid;
  22     UBYTE bs_vollab[FAT_MAX_SHORT_NAME];
  23     UBYTE bs_filsystype[8];
  24 }
  25 __attribute__ ((__packed__));
  26
  27 struct FATBootSector
  28 {
  29     UBYTE bs_jmp_boot[3];
  30     UBYTE bs_oem_name[8];
  31     UWORD bpb_bytes_per_sect;
  32     UBYTE bpb_sect_per_clust;
  33     UWORD bpb_rsvd_sect_count;
  34     UBYTE bpb_num_fats;
  35     UWORD bpb_root_entries_count;
  36     UWORD bpb_total_sectors_16;
  37     UBYTE bpb_media;
  38     UWORD bpb_fat_size_16;
  39     UWORD bpb_sect_per_track;
  40     UWORD bpb_num_heads;
  41     ULONG bpb_hidden_sect;
  42     ULONG bpb_total_sectors_32;
  43
  44     union
  45     {
  46         struct FATEBPB ebpb;
  47         struct
  48         {
  49             ULONG bpb_fat_size_32;
  50             UWORD bpb_extflags;
  51             UWORD bpb_fs_verion;
  52             ULONG bpb_root_cluster;
  53             UWORD bpb_fs_info;
  54             UWORD bpb_back_bootsec;
  55             UBYTE bpb_reserved[12];
  56             struct FATEBPB ebpb;
  57         }
  58         __attribute__ ((__packed__)) ebpb32;
  59     }
  60     ebpbs;
  61     UBYTE pad[420];
  62     UBYTE bpb_signature[2];
  63 }
  64 __attribute__ ((__packed__));
  65
  66 struct FATFSInfo
  67 {
  68     ULONG lead_sig;
  69     UBYTE reserved1[480];
  70     ULONG struct_sig;
  71     ULONG free_count;
  72     ULONG next_free;
  73     UBYTE reserved2[12];
  74     ULONG trail_sig;
  75 }
  76 __attribute__ ((__packed__));
  77
  78 #define FSI_LEAD_SIG 0x41615252
  79 #define FSI_STRUCT_SIG 0x61417272
  80 #define FSI_TRAIL_SIG 0xaa550000
  81
  82 struct FATDirEntry
  83 {
  84     UBYTE name[FAT_MAX_SHORT_NAME];
  85     UBYTE attr;
  86     UBYTE nt_res;
  87     UBYTE create_time_tenth;
  88     UWORD create_time;
  89     UWORD create_date;
  90     UWORD last_access_date;
  91     UWORD first_cluster_hi;
  92     UWORD write_time;
  93     UWORD write_date;
  94     UWORD first_cluster_lo;
  95     ULONG file_size;
  96 }
  97 __attribute__ ((__packed__));
  98
  99 #define ATTR_READ_ONLY  0x01
 100 #define ATTR_HIDDEN     0x02
 101 #define ATTR_SYSTEM     0x04
 102 #define ATTR_VOLUME_ID  0x08
 103 #define ATTR_DIRECTORY  0x10
 104 #define ATTR_ARCHIVE    0x20
 105
 106 #define ATTR_LONG_NAME (ATTR_READ_ONLY | ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME_ID)
 107 #define ATTR_LONG_NAME_MASK (ATTR_READ_ONLY | ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME_ID | ATTR_DIRECTORY | ATTR_ARCHIVE)
 108 #define ATTR_VOLUME_ID_MASK (ATTR_READ_ONLY | ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME_ID | ATTR_DIRECTORY)
 109
 110 struct FATLongDirEntry
 111 {
 112     UBYTE order;
 113     UWORD name1[5];
 114     UBYTE attr;
 115     UBYTE type;
 116     UBYTE checksum;
 117     UWORD name2[6];
 118     UWORD first_cluster_lo;
 119     UWORD name3[2];
 120 }
 121 __attribute__ ((__packed__));