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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 8bde7f776c77b343aca29b8c7b58464d915ac245 / . / include / fat.h
blob: b56219ced8f3f3fa575afe9471e5b06df86c0024 [file] [log] [blame]
wdenk71f95112003-06-15 22:40:42 +0000[diff] [blame]1/*
2 * R/O (V)FAT 12/16/32 filesystem implementation by Marcus Sundberg
3 *
4 * 2002-07-28 - rjones@nexus-tech.net - ported to ppcboot v1.1.6
5 * 2003-03-10 - kharris@nexus-tech.net - ported to u-boot
6 *
7 * See file CREDITS for list of people who contributed to this
8 * project.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
23 * MA 02111-1307 USA
24 *
25 */
26
27#ifndef _FAT_H_
28#define _FAT_H_
29
30#define CONFIG_SUPPORT_VFAT
31
32#define SECTOR_SIZE FS_BLOCK_SIZE
33
34#define FS_BLOCK_SIZE 512
35
36#if FS_BLOCK_SIZE != SECTOR_SIZE
37#error FS_BLOCK_SIZE != SECTOR_SIZE - This code needs to be fixed!
38#endif
39
40#define MAX_CLUSTSIZE 65536
41#define DIRENTSPERBLOCK (FS_BLOCK_SIZE/sizeof(dir_entry))
42#define DIRENTSPERCLUST ((mydata->clust_size*SECTOR_SIZE)/sizeof(dir_entry))
43
44#define FATBUFBLOCKS 6
45#define FATBUFSIZE (FS_BLOCK_SIZE*FATBUFBLOCKS)
46#define FAT12BUFSIZE ((FATBUFSIZE*3)/2)
47#define FAT16BUFSIZE (FATBUFSIZE/2)
48#define FAT32BUFSIZE (FATBUFSIZE/4)
49
50
51/* Filesystem identifiers */
52#define FAT12_SIGN "FAT12 "
53#define FAT16_SIGN "FAT16 "
54#define FAT32_SIGN "FAT32 "
55#define SIGNLEN 8
56
57/* File attributes */
58#define ATTR_RO 1
59#define ATTR_HIDDEN 2
60#define ATTR_SYS 4
61#define ATTR_VOLUME 8
62#define ATTR_DIR 16
63#define ATTR_ARCH 32
64
65#define ATTR_VFAT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
66
67#define DELETED_FLAG ((char)0xe5) /* Marks deleted files when in name[0] */
68#define aRING 0x05 /* Used to represent 'å' in name[0] */
69
70
71/* Flags telling whether we should read a file or list a directory */
72#define LS_NO 0
73#define LS_YES 1
74#define LS_DIR 1
75#define LS_ROOT 2
76
77#ifdef DEBUG
78#define FAT_DPRINT(args...) printf(args)
79#else
80#define FAT_DPRINT(args...)
81#endif
82#define FAT_ERROR(arg) printf(arg)
83
84#define ISDIRDELIM(c) ((c) == '/' || (c) == '\\')
85
86#define FSTYPE_NONE (-1)
87
88#if defined(__linux__) && defined(__KERNEL__)
89#define FAT2CPU16 le16_to_cpu
90#define FAT2CPU32 le32_to_cpu
91#else
92#if 1
93#define FAT2CPU16(x) (x)
94#define FAT2CPU32(x) (x)
95#else
96#define FAT2CPU16(x) ((((x) & 0x00ff) << 8) | (((x) & 0xff00) >> 8))
97#define FAT2CPU32(x) ((((x) & 0x000000ff) << 24) | \
98 (((x) & 0x0000ff00) << 8) | \
99 (((x) & 0x00ff0000) >> 8) | \
100 (((x) & 0xff000000) >> 24))
101#endif
102#endif
103
104#define TOLOWER(c) if((c) >= 'A' && (c) <= 'Z'){(c)+=('a' - 'A');}
105#define START(dent) (FAT2CPU16((dent)->start) \
106 + (mydata->fatsize != 32 ? 0 : \
107 (FAT2CPU16((dent)->starthi) << 16)))
108
109
110typedef struct boot_sector {
111 __u8 ignored[3]; /* Bootstrap code */
112 char system_id[8]; /* Name of fs */
113 __u8 sector_size[2]; /* Bytes/sector */
114 __u8 cluster_size; /* Sectors/cluster */
115 __u16 reserved; /* Number of reserved sectors */
116 __u8 fats; /* Number of FATs */
117 __u8 dir_entries[2]; /* Number of root directory entries */
118 __u8 sectors[2]; /* Number of sectors */
119 __u8 media; /* Media code */
120 __u16 fat_length; /* Sectors/FAT */
121 __u16 secs_track; /* Sectors/track */
122 __u16 heads; /* Number of heads */
123 __u32 hidden; /* Number of hidden sectors */
124 __u32 total_sect; /* Number of sectors (if sectors == 0) */
125
126 /* FAT32 only */
127 __u32 fat32_length; /* Sectors/FAT */
128 __u16 flags; /* Bit 8: fat mirroring, low 4: active fat */
129 __u8 version[2]; /* Filesystem version */
130 __u32 root_cluster; /* First cluster in root directory */
131 __u16 info_sector; /* Filesystem info sector */
132 __u16 backup_boot; /* Backup boot sector */
133 __u16 reserved2[6]; /* Unused */
134} boot_sector;
135
136typedef struct volume_info
137{
138 __u8 drive_number; /* BIOS drive number */
139 __u8 reserved; /* Unused */
140 __u8 ext_boot_sign; /* 0x29 if fields below exist (DOS 3.3+) */
141 __u8 volume_id[4]; /* Volume ID number */
142 char volume_label[11]; /* Volume label */
143 char fs_type[8]; /* Typically FAT12, FAT16, or FAT32 */
144 /* Boot code comes next, all but 2 bytes to fill up sector */
145 /* Boot sign comes last, 2 bytes */
146} volume_info;
147
148typedef struct dir_entry {
149 char name[8],ext[3]; /* Name and extension */
150 __u8 attr; /* Attribute bits */
151 __u8 lcase; /* Case for base and extension */
152 __u8 ctime_ms; /* Creation time, milliseconds */
153 __u16 ctime; /* Creation time */
154 __u16 cdate; /* Creation date */
155 __u16 adate; /* Last access date */
156 __u16 starthi; /* High 16 bits of cluster in FAT32 */
157 __u16 time,date,start;/* Time, date and first cluster */
158 __u32 size; /* File size in bytes */
159} dir_entry;
160
161typedef struct dir_slot {
162 __u8 id; /* Sequence number for slot */
163 __u8 name0_4[10]; /* First 5 characters in name */
164 __u8 attr; /* Attribute byte */
165 __u8 reserved; /* Unused */
166 __u8 alias_checksum;/* Checksum for 8.3 alias */
167 __u8 name5_10[12]; /* 6 more characters in name */
168 __u16 start; /* Unused */
169 __u8 name11_12[4]; /* Last 2 characters in name */
170} dir_slot;
171
172/* Private filesystem parameters */
173typedef struct {
174 int fatsize; /* Size of FAT in bits */
175 __u16 fatlength; /* Length of FAT in sectors */
176 __u16 fat_sect; /* Starting sector of the FAT */
177 __u16 rootdir_sect; /* Start sector of root directory */
178 __u16 clust_size; /* Size of clusters in sectors */
179 __u16 data_begin; /* The sector of the first cluster */
180 __u8 fatbuf[FATBUFSIZE]; /* Current FAT buffer */
181 int fatbufnum; /* Used by get_fatent, init to -1 */
182} fsdata;
183
184typedef int (file_detectfs_func)(void);
185typedef int (file_ls_func)(const char *dir);
186typedef long (file_read_func)(const char *filename, void *buffer,
187 unsigned long maxsize);
188
189struct filesystem {
190 file_detectfs_func *detect;
191 file_ls_func *ls;
192 file_read_func *read;
193 const char name[12];
194};
195
196/* FAT tables */
197file_detectfs_func file_fat_detectfs;
198file_ls_func file_fat_ls;
199file_read_func file_fat_read;
200
201/* Currently this doesn't check if the dir exists or is valid... */
202int file_cd(const char *path);
203int file_fat_detectfs(void);
204int file_fat_ls(const char *dir);
205long file_fat_read(const char *filename, void *buffer, unsigned long maxsize);
206const char *file_getfsname(int idx);
207
208#endif /* _FAT_H_ */