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 } __packed;
  25
  26 struct FATBootSector
  27 {
  28     UBYTE bs_jmp_boot[3];
  29     UBYTE bs_oem_name[8];
  30     UWORD bpb_bytes_per_sect;
  31     UBYTE bpb_sect_per_clust;
  32     UWORD bpb_rsvd_sect_count;
  33     UBYTE bpb_num_fats;
  34     UWORD bpb_root_entries_count;
  35     UWORD bpb_total_sectors_16;
  36     UBYTE bpb_media;
  37     UWORD bpb_fat_size_16;
  38     UWORD bpb_sect_per_track;
  39     UWORD bpb_num_heads;
  40     ULONG bpb_hidden_sect;
  41     ULONG bpb_total_sectors_32;
  42
  43     union
  44     {
  45         struct FATEBPB ebpb;
  46         struct
  47         {
  48             ULONG bpb_fat_size_32;
  49             UWORD bpb_extflags;
  50             UWORD bpb_fs_verion;
  51             ULONG bpb_root_cluster;
  52             UWORD bpb_fs_info;
  53             UWORD bpb_back_bootsec;
  54             UBYTE bpb_reserved[12];
  55             struct FATEBPB ebpb;
  56         } __packed ebpb32;
  57     }
  58     ebpbs;
  59     UBYTE pad[420];
  60     UBYTE bpb_signature[2];
  61 } __packed;
  62
  63 struct FATFSInfo
  64 {
  65     ULONG lead_sig;
  66     UBYTE reserved1[480];
  67     ULONG struct_sig;
  68     ULONG free_count;
  69     ULONG next_free;
  70     UBYTE reserved2[12];
  71     ULONG trail_sig;
  72 } __packed;
  73
  74 #define FSI_LEAD_SIG 0x41615252
  75 #define FSI_STRUCT_SIG 0x61417272
  76 #define FSI_TRAIL_SIG 0xaa550000
  77
  78 struct FATDirEntry
  79 {
  80     UBYTE name[FAT_MAX_SHORT_NAME];
  81     UBYTE attr;
  82     UBYTE nt_res;
  83     UBYTE create_time_tenth;
  84     UWORD create_time;
  85     UWORD create_date;
  86     UWORD last_access_date;
  87     UWORD first_cluster_hi;
  88     UWORD write_time;
  89     UWORD write_date;
  90     UWORD first_cluster_lo;
  91     ULONG file_size;
  92 } __packed;
  93
  94 #define ATTR_READ_ONLY  0x01
  95 #define ATTR_HIDDEN     0x02
  96 #define ATTR_SYSTEM     0x04
  97 #define ATTR_VOLUME_ID  0x08
  98 #define ATTR_DIRECTORY  0x10
  99 #define ATTR_ARCHIVE    0x20
 100
 101 #define ATTR_LONG_NAME (ATTR_READ_ONLY | ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME_ID)
 102 #define ATTR_LONG_NAME_MASK (ATTR_READ_ONLY | ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME_ID | ATTR_DIRECTORY | ATTR_ARCHIVE)
 103 #define ATTR_VOLUME_ID_MASK (ATTR_READ_ONLY | ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME_ID | ATTR_DIRECTORY)
 104
 105 struct FATLongDirEntry
 106 {
 107     UBYTE order;
 108     UWORD name1[5];
 109     UBYTE attr;
 110     UBYTE type;
 111     UBYTE checksum;
 112     UWORD name2[6];
 113     UWORD first_cluster_lo;
 114     UWORD name3[2];
 115 } __packed;