rom/filesys/fat/fat_struct.h

   1 /*
   2  * fat.handler - FAT12/16/32 filesystem handler
   3  *
   4  * Copyright © 2006 Marek Szyprowski
   5  * Copyright © 2007-2011 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 struct FATBootSector {
  14     UBYTE bs_jmp_boot[3];
  15     UBYTE bs_oem_name[8];
  16     UWORD bpb_bytes_per_sect;
  17     UBYTE bpb_sect_per_clust;
  18     UWORD bpb_rsvd_sect_count;
  19     UBYTE bpb_num_fats;
  20     UWORD bpb_root_entries_count;
  21     UWORD bpb_total_sectors_16;
  22     UBYTE bpb_media;
  23     UWORD bpb_fat_size_16;
  24     UWORD bpb_sect_per_track;
  25     UWORD bpb_num_heads;
  26     ULONG bpb_hidden_sect;
  27     ULONG bpb_total_sectors_32;
  28
  29     union {
  30         struct {
  31             UBYTE bs_drvnum;
  32             UBYTE bs_reserved1;
  33             UBYTE bs_bootsig;
  34             ULONG bs_volid;
  35             UBYTE bs_vollab[11];
  36             UBYTE bs_filsystype[8];
  37         } __attribute__ ((__packed__)) fat16;
  38
  39         struct {
  40             ULONG bpb_fat_size_32;
  41             UWORD bpb_extflags;
  42             UWORD bpb_fs_verion;
  43             ULONG bpb_root_cluster;
  44             UWORD bpb_fs_info;
  45             UWORD bpb_back_bootsec;
  46             UBYTE bpb_reserved[12];
  47             UBYTE bs_drvnum;
  48             UBYTE bs_reserved1;
  49             UBYTE bs_bootsig;
  50             ULONG bs_volid;
  51             UBYTE bs_vollab[11];
  52             UBYTE bs_filsystype[8];
  53         } __attribute__ ((__packed__)) fat32;
  54     } type;
  55     UBYTE pad[420];
  56     UBYTE bpb_signature[2];
  57 } __attribute__ ((__packed__));
  58
  59 struct FATFSInfo {
  60     ULONG lead_sig;
  61     UBYTE reserved1[480];
  62     ULONG struct_sig;
  63     ULONG free_count;
  64     ULONG next_free;
  65     UBYTE reserved2[12];
  66     ULONG trail_sig;
  67 } __attribute__ ((__packed__));
  68
  69 #define FSI_LEAD_SIG 0x41615252
  70 #define FSI_STRUCT_SIG 0x61417272
  71 #define FSI_TRAIL_SIG 0xaa550000
  72
  73 struct FATDirEntry {
  74     UBYTE name[11];
  75     UBYTE attr;
  76     UBYTE nt_res;
  77     UBYTE create_time_tenth;
  78     UWORD create_time;
  79     UWORD create_date;
  80     UWORD last_access_date;
  81     UWORD first_cluster_hi;
  82     UWORD write_time;
  83     UWORD write_date;
  84     UWORD first_cluster_lo;
  85     ULONG file_size;
  86 } __attribute__ ((__packed__));
  87
  88 #define ATTR_READ_ONLY  0x01
  89 #define ATTR_HIDDEN     0x02
  90 #define ATTR_SYSTEM     0x04
  91 #define ATTR_VOLUME_ID  0x08
  92 #define ATTR_DIRECTORY  0x10
  93 #define ATTR_ARCHIVE    0x20
  94
  95 #define ATTR_LONG_NAME (ATTR_READ_ONLY | ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME_ID)
  96 #define ATTR_LONG_NAME_MASK (ATTR_READ_ONLY | ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME_ID | ATTR_DIRECTORY | ATTR_ARCHIVE)
  97 #define ATTR_VOLUME_ID_MASK (ATTR_READ_ONLY | ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME_ID | ATTR_DIRECTORY)
  98
  99 struct FATLongDirEntry {
 100     UBYTE order;
 101     UWORD name1[5];
 102     UBYTE attr;
 103     UBYTE type;
 104     UBYTE checksum;
 105     UWORD name2[6];
 106     UWORD first_cluster_lo;
 107     UWORD name3[2];
 108 } __attribute__ ((__packed__));
 109
 110 #define FAT_MAX_LONG_FILENAME 0xff