154 lines
5.3 KiB
C
154 lines
5.3 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2002 by Linus Nielsen Feltzing
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef FAT_H
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#define FAT_H
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#define FATTYPE_FAT12 0
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#define FATTYPE_FAT16 1
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#define FATTYPE_FAT32 2
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#define BS_JMPBOOT 0
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#define BS_OEMNAME 3
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#define BPB_BYTSPERSEC 11
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#define BPB_SECPERCLUS 13
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#define BPB_RSVDSECCNT 14
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#define BPB_NUMFATS 16
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#define BPB_ROOTENTCNT 17
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#define BPB_TOTSEC16 19
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#define BPB_MEDIA 21
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#define BPB_FATSZ16 22
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#define BPB_SECPERTRK 24
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#define BPB_NUMHEADS 26
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#define BPB_HIDDSEC 28
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#define BPB_TOTSEC32 32
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#define BS_DRVNUM 36
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#define BS_RESERVED1 37
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#define BS_BOOTSIG 38
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#define BS_VOLID 39
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#define BS_VOLLAB 43
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#define BS_FILSYSTYPE 54
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#define BPB_FATSZ32 36
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#define BPB_LAST_WORD 510
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#define MIN(a,b) (((a) < (b))?(a):(b)))
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struct bpb
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{
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char bs_oemname[9]; /* OEM string, ending with \0 */
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int bpb_bytspersec; /* Bytes per sectory, typically 512 */
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int bpb_secperclus; /* Sectors per cluster */
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int bpb_rsvdseccnt; /* Number of reserved sectors */
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int bpb_numfats; /* Number of FAT structures, typically 2 */
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int bpb_rootentcnt; /* Number of dir entries in the root */
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int bpb_totsec16; /* Number of sectors on the volume (old 16-bit) */
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int bpb_media; /* Media type (typically 0xf0 or 0xf8) */
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int bpb_fatsz16; /* Number of used sectors per FAT structure */
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int bpb_secpertrk; /* Number of sectors per track */
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int bpb_numheads; /* Number of heads */
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int bpb_hiddsec; /* Hidden sectors before the volume */
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unsigned int bpb_totsec32; /* Number of sectors on the volume
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(new 32-bit) */
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/**** FAT12/16 specific *****/
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int bs_drvnum; /* Drive number */
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int bs_bootsig; /* Is 0x29 if the following 3 fields are valid */
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unsigned int bs_volid; /* Volume ID */
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char bs_vollab[12]; /* Volume label, 11 chars plus \0 */
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char bs_filsystype[9]; /* File system type, 8 chars plus \0 */
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/**** FAT32 specific *****/
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int bpb_fatsz32;
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int last_word; /* Must be 0xaa55 */
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int fat_type; /* What type of FAT is this? */
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};
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#define FAT_ATTR_READ_ONLY 0x01
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#define FAT_ATTR_HIDDEN 0x02
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#define FAT_ATTR_SYSTEM 0x04
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#define FAT_ATTR_VOLUME_ID 0x08
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#define FAT_ATTR_DIRECTORY 0x10
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#define FAT_ATTR_ARCHIVE 0x20
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#define FAT_ATTR_LONG_NAME (FAT_ATTR_READ_ONLY | FAT_ATTR_HIDDEN | \
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FAT_ATTR_SYSTEM | FAT_ATTR_VOLUME_ID)
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#define FATDIR_NAME 0
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#define FATDIR_ATTR 11
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#define FATDIR_NTRES 12
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#define FATDIR_CRTTIMETENTH 13
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#define FATDIR_CRTTIME 14
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#define FATDIR_CRTDATE 16
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#define FATDIR_LSTACCDATE 18
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#define FATDIR_FSTCLUSHI 20
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#define FATDIR_WRTTIME 22
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#define FATDIR_WRTDATE 24
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#define FATDIR_FSTCLUSLO 26
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#define FATDIR_FILESIZE 28
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struct fat_direntry
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{
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unsigned char name[12]; /* Name plus \0 */
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unsigned short attr; /* Attributes */
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unsigned char crttimetenth; /* Millisecond creation
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time stamp (0-199) */
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unsigned short crttime; /* Creation time */
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unsigned short crtdate; /* Creation date */
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unsigned short lstaccdate; /* Last access date */
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unsigned short fstclushi; /* High word of first cluster
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(0 for FAT12/16) */
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unsigned short wrttime; /* Last write time */
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unsigned short wrtdate; /* Last write date */
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unsigned short fstcluslo; /* Low word of first cluster */
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unsigned int filesize; /* File size in bytes */
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};
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struct fat_context
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{
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unsigned int curr_dir_sec; /* Current directory sector */
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};
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struct disk_info
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{
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int num_sectors;
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int sec_per_track;
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int num_heads;
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unsigned int hidden_sectors;
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};
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struct fat_dirent
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{
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int entry;
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unsigned int cached_sec;
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unsigned int num_sec;
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char cached_buf[BLOCK_SIZE];
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};
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int fat_format(struct disk_info *di, char *vol_name);
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int fat_create_file(struct bpb *bpb, unsigned int currdir, char *name);
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int fat_opendir(struct bpb *bpb, struct fat_dirent *ent, unsigned int currdir);
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int fat_getnext(struct bpb *bpb, struct fat_dirent *ent,
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struct fat_direntry *entry);
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#endif
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