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gerrit.rockbox.org / rockbox / 7e8e1005d1f72c9fd846d45742a12c5654c337a5 / . / firmware / fat.h
blob: f1dc8dc5a04c45398fe615a52b9f0776d46a47df [file] [log] [blame]
Björn Stenbergd9eb5c72002-03-28 15:09:10 +0000[diff] [blame]1/***************************************************************************
2 * __________ __ ___.
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
7 * \/ \/ \/ \/ \/
8 * $Id$
9 *
10 * Copyright (C) 2002 by Linus Nielsen Feltzing
11 *
12 * All files in this archive are subject to the GNU General Public License.
13 * See the file COPYING in the source tree root for full license agreement.
14 *
15 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
16 * KIND, either express or implied.
17 *
18 ****************************************************************************/
19
20#ifndef FAT_H
21#define FAT_H
22
23#define FATTYPE_FAT12 0
24#define FATTYPE_FAT16 1
25#define FATTYPE_FAT32 2
26
27#define BS_JMPBOOT 0
28#define BS_OEMNAME 3
29#define BPB_BYTSPERSEC 11
30#define BPB_SECPERCLUS 13
31#define BPB_RSVDSECCNT 14
32#define BPB_NUMFATS 16
33#define BPB_ROOTENTCNT 17
34#define BPB_TOTSEC16 19
35#define BPB_MEDIA 21
36#define BPB_FATSZ16 22
37#define BPB_SECPERTRK 24
38#define BPB_NUMHEADS 26
39#define BPB_HIDDSEC 28
40#define BPB_TOTSEC32 32
41
42#define BS_DRVNUM 36
43#define BS_RESERVED1 37
44#define BS_BOOTSIG 38
45#define BS_VOLID 39
46#define BS_VOLLAB 43
47#define BS_FILSYSTYPE 54
48
49#define BPB_FATSZ32 36
50
51#define BPB_LAST_WORD 510
52
53#define MIN(a,b) (((a) < (b))?(a):(b)))
54
55struct bpb
56{
57 char bs_oemname[9]; /* OEM string, ending with \0 */
58 int bpb_bytspersec; /* Bytes per sectory, typically 512 */
59 int bpb_secperclus; /* Sectors per cluster */
60 int bpb_rsvdseccnt; /* Number of reserved sectors */
61 int bpb_numfats; /* Number of FAT structures, typically 2 */
62 int bpb_rootentcnt; /* Number of dir entries in the root */
63 int bpb_totsec16; /* Number of sectors on the volume (old 16-bit) */
64 int bpb_media; /* Media type (typically 0xf0 or 0xf8) */
65 int bpb_fatsz16; /* Number of used sectors per FAT structure */
66 int bpb_secpertrk; /* Number of sectors per track */
67 int bpb_numheads; /* Number of heads */
68 int bpb_hiddsec; /* Hidden sectors before the volume */
69 unsigned int bpb_totsec32; /* Number of sectors on the volume
70 (new 32-bit) */
71 /**** FAT12/16 specific *****/
72 int bs_drvnum; /* Drive number */
73 int bs_bootsig; /* Is 0x29 if the following 3 fields are valid */
74 unsigned int bs_volid; /* Volume ID */
75 char bs_vollab[12]; /* Volume label, 11 chars plus \0 */
76 char bs_filsystype[9]; /* File system type, 8 chars plus \0 */
77
78 /**** FAT32 specific *****/
79 int bpb_fatsz32;
80
81 int last_word; /* Must be 0xaa55 */
82
83 int fat_type; /* What type of FAT is this? */
84};
85
86#define FAT_ATTR_READ_ONLY 0x01
87#define FAT_ATTR_HIDDEN 0x02
88#define FAT_ATTR_SYSTEM 0x04
89#define FAT_ATTR_VOLUME_ID 0x08
90#define FAT_ATTR_DIRECTORY 0x10
91#define FAT_ATTR_ARCHIVE 0x20
92#define FAT_ATTR_LONG_NAME (FAT_ATTR_READ_ONLY | FAT_ATTR_HIDDEN | \
93 FAT_ATTR_SYSTEM | FAT_ATTR_VOLUME_ID)
94
95
96#define FATDIR_NAME 0
97#define FATDIR_ATTR 11
98#define FATDIR_NTRES 12
99#define FATDIR_CRTTIMETENTH 13
100#define FATDIR_CRTTIME 14
101#define FATDIR_CRTDATE 16
102#define FATDIR_LSTACCDATE 18
103#define FATDIR_FSTCLUSHI 20
104#define FATDIR_WRTTIME 22
105#define FATDIR_WRTDATE 24
106#define FATDIR_FSTCLUSLO 26
107#define FATDIR_FILESIZE 28
108
109struct fat_direntry
110{
111 unsigned char name[12]; /* Name plus \0 */
112 unsigned short attr; /* Attributes */
113 unsigned char crttimetenth; /* Millisecond creation
114 time stamp (0-199) */
115 unsigned short crttime; /* Creation time */
116 unsigned short crtdate; /* Creation date */
117 unsigned short lstaccdate; /* Last access date */
118 unsigned short fstclushi; /* High word of first cluster
119 (0 for FAT12/16) */
120 unsigned short wrttime; /* Last write time */
121 unsigned short wrtdate; /* Last write date */
122 unsigned short fstcluslo; /* Low word of first cluster */
123 unsigned int filesize; /* File size in bytes */
124};
125
126struct fat_context
127{
128 unsigned int curr_dir_sec; /* Current directory sector */
129
130};
131
132struct disk_info
133{
134 int num_sectors;
135 int sec_per_track;
136 int num_heads;
137 unsigned int hidden_sectors;
138};
139
140struct fat_dirent
141{
142 int entry;
143 unsigned int cached_sec;
144 unsigned int num_sec;
145 char cached_buf[BLOCK_SIZE];
146};
147
148int fat_format(struct disk_info *di, char *vol_name);
149int fat_create_file(struct bpb *bpb, unsigned int currdir, char *name);
150int fat_opendir(struct bpb *bpb, struct fat_dirent *ent, unsigned int currdir);
151int fat_getnext(struct bpb *bpb, struct fat_dirent *ent,
152 struct fat_direntry *entry);
153
154#endif