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     UBYTE bs_drvnum;
  18     UBYTE bs_reserved1;
  19     UBYTE bs_bootsig;
  20     ULONG bs_volid;
  21     UBYTE bs_vollab[FAT_MAX_SHORT_NAME];
  22     UBYTE bs_filsystype[8];
  23 } __attribute__ ((__packed__));
  24
  25 struct FATBootSector {
  26     UBYTE bs_jmp_boot[3];
  27     UBYTE bs_oem_name[8];
  28     UWORD bpb_bytes_per_sect;
  29     UBYTE bpb_sect_per_clust;
  30     UWORD bpb_rsvd_sect_count;
  31     UBYTE bpb_num_fats;
  32     UWORD bpb_root_entries_count;
  33     UWORD bpb_total_sectors_16;
  34     UBYTE bpb_media;
  35     UWORD bpb_fat_size_16;
  36     UWORD bpb_sect_per_track;
  37     UWORD bpb_num_heads;
  38     ULONG bpb_hidden_sect;
  39     ULONG bpb_total_sectors_32;
  40
  41     union {
  42         struct FATEBPB ebpb;
  43         struct {
  44             ULONG bpb_fat_size_32;
  45             UWORD bpb_extflags;
  46             UWORD bpb_fs_verion;
  47             ULONG bpb_root_cluster;
  48             UWORD bpb_fs_info;
  49             UWORD bpb_back_bootsec;
  50             UBYTE bpb_reserved[12];
  51             struct FATEBPB ebpb;
  52         } __attribute__ ((__packed__)) ebpb32;
  53     } ebpbs;
  54     UBYTE pad[420];
  55     UBYTE bpb_signature[2];
  56 } __attribute__ ((__packed__));
  57
  58 struct FATFSInfo {
  59     ULONG lead_sig;
  60     UBYTE reserved1[480];
  61     ULONG struct_sig;
  62     ULONG free_count;
  63     ULONG next_free;
  64     UBYTE reserved2[12];
  65     ULONG trail_sig;
  66 } __attribute__ ((__packed__));
  67
  68 #define FSI_LEAD_SIG 0x41615252
  69 #define FSI_STRUCT_SIG 0x61417272
  70 #define FSI_TRAIL_SIG 0xaa550000
  71
  72 struct FATDirEntry {
  73     UBYTE name[FAT_MAX_SHORT_NAME];
  74     UBYTE attr;
  75     UBYTE nt_res;
  76     UBYTE create_time_tenth;
  77     UWORD create_time;
  78     UWORD create_date;
  79     UWORD last_access_date;
  80     UWORD first_cluster_hi;
  81     UWORD write_time;
  82     UWORD write_date;
  83     UWORD first_cluster_lo;
  84     ULONG file_size;
  85 } __attribute__ ((__packed__));
  86
  87 #define ATTR_READ_ONLY  0x01
  88 #define ATTR_HIDDEN     0x02
  89 #define ATTR_SYSTEM     0x04
  90 #define ATTR_VOLUME_ID  0x08
  91 #define ATTR_DIRECTORY  0x10
  92 #define ATTR_ARCHIVE    0x20
  93
  94 #define ATTR_LONG_NAME (ATTR_READ_ONLY | ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME_ID)
  95 #define ATTR_LONG_NAME_MASK (ATTR_READ_ONLY | ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME_ID | ATTR_DIRECTORY | ATTR_ARCHIVE)
  96 #define ATTR_VOLUME_ID_MASK (ATTR_READ_ONLY | ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME_ID | ATTR_DIRECTORY)
  97
  98 struct FATLongDirEntry {
  99     UBYTE order;
 100     UWORD name1[5];
 101     UBYTE attr;
 102     UBYTE type;
 103     UBYTE checksum;
 104     UWORD name2[6];
 105     UWORD first_cluster_lo;
 106     UWORD name3[2];
 107 } __attribute__ ((__packed__));