120 lines
4.2 KiB
C
120 lines
4.2 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 SECTOR_SIZE 512
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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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int last_word; /* 0xAA55 */
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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 bpb_extflags;
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int bpb_fsver;
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int bpb_rootclus;
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int bpb_fsinfo;
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int bpb_bkbootsec;
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/* variables for internal use */
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int fatsize;
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int totalsectors;
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int rootdirsector;
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int firstdatasector;
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int startsector;
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};
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struct fat_direntry
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{
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unsigned char name[256]; /* 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 wrttime; /* Last write time */
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unsigned short wrtdate; /* Last write date */
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unsigned int filesize; /* File size in bytes */
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int firstcluster; /* fstclusterhi<<16 + fstcluslo */
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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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struct fat_dir
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{
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int entry;
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int cached_sec;
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int num_sec;
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unsigned char cached_buf[SECTOR_SIZE];
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};
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struct fat_file
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{
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int firstcluster; /* first cluster in file */
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int nextcluster; /* cluster of last access */
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int nextsector; /* sector of last access */
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int sectornum; /* sector number in this cluster */
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};
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/* global FAT info struct */
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extern struct bpb fat_bpb;
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extern int fat_mount(int startsector);
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#ifdef DISK_WRITE
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extern int fat_create_file(unsigned int currdir, char *name);
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extern int fat_create_dir(unsigned int currdir, char *name);
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#endif
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extern int fat_open(unsigned int cluster, struct fat_file *ent);
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extern int fat_read(struct fat_file *ent, int sectorcount, void* buf );
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extern int fat_seek(struct fat_file *ent, int sector );
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extern int fat_opendir(struct fat_dir *ent, unsigned int currdir);
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extern int fat_getnext(struct fat_dir *ent, struct fat_direntry *entry);
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#endif
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