46ddacf533
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@2742 a1c6a512-1295-4272-9138-f99709370657
1309 lines
38 KiB
C
1309 lines
38 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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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <stdbool.h>
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#include "fat.h"
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#include "ata.h"
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#include "debug.h"
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#include "panic.h"
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#include "system.h"
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#define BYTES2INT16(array,pos) \
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(array[pos] | (array[pos+1] << 8 ))
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#define BYTES2INT32(array,pos) \
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(array[pos] | (array[pos+1] << 8 ) | \
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(array[pos+2] << 16 ) | (array[pos+3] << 24 ))
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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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/* BPB offsets; generic */
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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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/* fat12/16 */
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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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/* fat32 */
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#define BPB_FATSZ32 36
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#define BPB_EXTFLAGS 40
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#define BPB_FSVER 42
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#define BPB_ROOTCLUS 44
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#define BPB_FSINFO 48
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#define BPB_BKBOOTSEC 50
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#define BS_32_DRVNUM 64
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#define BS_32_BOOTSIG 66
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#define BS_32_VOLID 67
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#define BS_32_VOLLAB 71
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#define BS_32_FILSYSTYPE 82
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#define BPB_LAST_WORD 510
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/* attributes */
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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 FAT_ATTR_LONG_NAME_MASK (FAT_ATTR_READ_ONLY | FAT_ATTR_HIDDEN | \
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FAT_ATTR_SYSTEM | FAT_ATTR_VOLUME_ID | \
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FAT_ATTR_DIRECTORY | FAT_ATTR_ARCHIVE )
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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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#define CLUSTERS_PER_FAT_SECTOR (SECTOR_SIZE / 4)
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#define DIR_ENTRIES_PER_SECTOR (SECTOR_SIZE / 32)
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#define DIR_ENTRY_SIZE 32
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#define FAT_BAD_MARK 0x0ffffff7
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#define FAT_EOF_MARK 0x0ffffff8
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struct fsinfo {
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int freecount; /* last known free cluster count */
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int nextfree; /* first cluster to start looking for free clusters,
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or 0xffffffff for no hint */
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};
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/* fsinfo offsets */
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#define FSINFO_FREECOUNT 488
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#define FSINFO_NEXTFREE 492
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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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struct fsinfo fsinfo;
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};
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static struct bpb fat_bpb;
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static int first_sector_of_cluster(int cluster);
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static int bpb_is_sane(void);
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static void *cache_fat_sector(int secnum);
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#ifdef DISK_WRITE
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static unsigned int getcurrdostime(unsigned short *dosdate,
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unsigned short *dostime,
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unsigned char *dostenth);
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static int create_dos_name(unsigned char *name, unsigned char *newname);
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static int find_free_cluster(int start);
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#endif
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#define FAT_CACHE_SIZE 0x20
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#define FAT_CACHE_MASK (FAT_CACHE_SIZE-1)
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struct fat_cache_entry
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{
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int secnum;
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bool inuse;
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bool dirty;
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};
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static char fat_cache_sectors[FAT_CACHE_SIZE][SECTOR_SIZE];
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static struct fat_cache_entry fat_cache[FAT_CACHE_SIZE];
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/* sectors cache for longname use */
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static unsigned char lastsector[SECTOR_SIZE];
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static unsigned char lastsector2[SECTOR_SIZE];
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static int sec2cluster(int sec)
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{
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if ( sec < fat_bpb.firstdatasector )
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{
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DEBUGF( "sec2cluster() - Bad sector number (%d)\n", sec);
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return -1;
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}
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return ((sec - fat_bpb.firstdatasector) / fat_bpb.bpb_secperclus) + 2;
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}
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static int cluster2sec(int cluster)
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{
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int max_cluster = fat_bpb.totalsectors -
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fat_bpb.firstdatasector / fat_bpb.bpb_secperclus + 1;
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if(cluster > max_cluster)
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{
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DEBUGF( "cluster2sec() - Bad cluster number (%d)\n",
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cluster);
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return -1;
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}
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return first_sector_of_cluster(cluster);
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}
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static int first_sector_of_cluster(int cluster)
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{
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return (cluster - 2) * fat_bpb.bpb_secperclus + fat_bpb.firstdatasector;
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}
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int fat_startsector(void)
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{
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return fat_bpb.startsector;
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}
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int fat_mount(int startsector)
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{
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unsigned char buf[SECTOR_SIZE];
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int err;
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int datasec;
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int countofclusters;
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int i;
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for(i = 0;i < FAT_CACHE_SIZE;i++)
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{
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fat_cache[i].secnum = 8; /* We use a "safe" sector just in case */
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fat_cache[i].inuse = false;
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fat_cache[i].dirty = false;
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}
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/* Read the sector */
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err = ata_read_sectors(startsector,1,buf);
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if(err)
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{
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DEBUGF( "fat_mount() - Couldn't read BPB (error code %d)\n", err);
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return -1;
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}
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memset(&fat_bpb, 0, sizeof(struct bpb));
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fat_bpb.startsector = startsector;
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strncpy(fat_bpb.bs_oemname, &buf[BS_OEMNAME], 8);
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fat_bpb.bs_oemname[8] = 0;
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fat_bpb.bpb_bytspersec = BYTES2INT16(buf,BPB_BYTSPERSEC);
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fat_bpb.bpb_secperclus = buf[BPB_SECPERCLUS];
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fat_bpb.bpb_rsvdseccnt = BYTES2INT16(buf,BPB_RSVDSECCNT);
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fat_bpb.bpb_numfats = buf[BPB_NUMFATS];
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fat_bpb.bpb_totsec16 = BYTES2INT16(buf,BPB_TOTSEC16);
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fat_bpb.bpb_media = buf[BPB_MEDIA];
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fat_bpb.bpb_fatsz16 = BYTES2INT16(buf,BPB_FATSZ16);
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fat_bpb.bpb_fatsz32 = BYTES2INT32(buf,BPB_FATSZ32);
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fat_bpb.bpb_secpertrk = BYTES2INT16(buf,BPB_SECPERTRK);
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fat_bpb.bpb_numheads = BYTES2INT16(buf,BPB_NUMHEADS);
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fat_bpb.bpb_hiddsec = BYTES2INT32(buf,BPB_HIDDSEC);
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fat_bpb.bpb_totsec32 = BYTES2INT32(buf,BPB_TOTSEC32);
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fat_bpb.last_word = BYTES2INT16(buf,BPB_LAST_WORD);
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/* calculate a few commonly used values */
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if (fat_bpb.bpb_fatsz16 != 0)
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fat_bpb.fatsize = fat_bpb.bpb_fatsz16;
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else
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fat_bpb.fatsize = fat_bpb.bpb_fatsz32;
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if (fat_bpb.bpb_totsec16 != 0)
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fat_bpb.totalsectors = fat_bpb.bpb_totsec16;
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else
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fat_bpb.totalsectors = fat_bpb.bpb_totsec32;
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fat_bpb.firstdatasector = fat_bpb.bpb_rsvdseccnt +
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fat_bpb.bpb_numfats * fat_bpb.fatsize;
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/* Determine FAT type */
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datasec = fat_bpb.totalsectors - fat_bpb.firstdatasector;
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countofclusters = datasec / fat_bpb.bpb_secperclus;
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#ifdef TEST_FAT
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/*
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we are sometimes testing with "illegally small" fat32 images,
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so we don't use the proper fat32 test case for test code
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*/
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if ( fat_bpb.bpb_fatsz16 )
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#else
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if ( countofclusters < 65525 )
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#endif
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{
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DEBUGF("This is not FAT32. Go away!\n");
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return -2;
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}
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fat_bpb.bpb_extflags = BYTES2INT16(buf,BPB_EXTFLAGS);
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fat_bpb.bpb_fsver = BYTES2INT16(buf,BPB_FSVER);
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fat_bpb.bpb_rootclus = BYTES2INT32(buf,BPB_ROOTCLUS);
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fat_bpb.bpb_fsinfo = BYTES2INT16(buf,BPB_FSINFO);
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fat_bpb.bpb_bkbootsec = BYTES2INT16(buf,BPB_BKBOOTSEC);
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fat_bpb.bs_drvnum = buf[BS_32_DRVNUM];
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fat_bpb.bs_bootsig = buf[BS_32_BOOTSIG];
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if(fat_bpb.bs_bootsig == 0x29)
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{
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fat_bpb.bs_volid = BYTES2INT32(buf,BS_32_VOLID);
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strncpy(fat_bpb.bs_vollab, &buf[BS_32_VOLLAB], 11);
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strncpy(fat_bpb.bs_filsystype, &buf[BS_32_FILSYSTYPE], 8);
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}
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if (bpb_is_sane() < 0)
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{
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DEBUGF( "fat_mount() - BPB is not sane\n");
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return -3;
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}
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fat_bpb.rootdirsector = cluster2sec(fat_bpb.bpb_rootclus);
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/* Read the fsinfo sector */
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err = ata_read_sectors(startsector + fat_bpb.bpb_fsinfo, 1, buf);
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if (err)
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{
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DEBUGF( "fat_mount() - Couldn't read FSInfo (error code %d)\n", err);
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return -4;
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}
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fat_bpb.fsinfo.freecount = BYTES2INT32(buf, FSINFO_FREECOUNT);
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fat_bpb.fsinfo.nextfree = BYTES2INT32(buf, FSINFO_NEXTFREE);
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LDEBUGF("Freecount: %x\n",fat_bpb.fsinfo.freecount);
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LDEBUGF("Nextfree: %x\n",fat_bpb.fsinfo.nextfree);
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return 0;
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}
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static int bpb_is_sane(void)
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{
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if(fat_bpb.bpb_bytspersec != 512)
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{
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DEBUGF( "bpb_is_sane() - Error: sector size is not 512 (%d)\n",
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fat_bpb.bpb_bytspersec);
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return -1;
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}
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if(fat_bpb.bpb_secperclus * fat_bpb.bpb_bytspersec > 32768)
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{
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DEBUGF( "bpb_is_sane() - Warning: cluster size is larger than 32K "
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"(%d * %d = %d)\n",
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fat_bpb.bpb_bytspersec, fat_bpb.bpb_secperclus,
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fat_bpb.bpb_bytspersec * fat_bpb.bpb_secperclus);
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}
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if (fat_bpb.bpb_rsvdseccnt != 32)
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{
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DEBUGF( "bpb_is_sane() - Warning: Reserved sectors is not 32 (%d)\n",
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fat_bpb.bpb_rsvdseccnt);
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}
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if(fat_bpb.bpb_numfats != 2)
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{
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DEBUGF( "bpb_is_sane() - Warning: NumFATS is not 2 (%d)\n",
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fat_bpb.bpb_numfats);
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}
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if(fat_bpb.bpb_media != 0xf0 && fat_bpb.bpb_media < 0xf8)
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{
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DEBUGF( "bpb_is_sane() - Warning: Non-standard "
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"media type (0x%02x)\n",
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fat_bpb.bpb_media);
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}
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if(fat_bpb.last_word != 0xaa55)
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{
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DEBUGF( "bpb_is_sane() - Error: Last word is not "
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"0xaa55 (0x%04x)\n", fat_bpb.last_word);
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return -4;
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}
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if (fat_bpb.fsinfo.freecount >
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(fat_bpb.totalsectors - fat_bpb.firstdatasector)/
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fat_bpb.bpb_secperclus)
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{
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DEBUGF( "bpb_is_sane() - Error: FSInfo.Freecount > disk size "
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"(0x%04x)\n", fat_bpb.fsinfo.freecount);
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return -5;
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}
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return 0;
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}
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static void *cache_fat_sector(int fatsector)
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{
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int secnum = fatsector + fat_bpb.bpb_rsvdseccnt;
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int cache_index = secnum & FAT_CACHE_MASK;
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/* Delete the cache entry if it isn't the sector we want */
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if(fat_cache[cache_index].inuse &&
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fat_cache[cache_index].secnum != secnum)
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{
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/* Write back if it is dirty */
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if(fat_cache[cache_index].dirty)
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{
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if(ata_write_sectors(secnum + fat_bpb.startsector, 1,
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fat_cache_sectors[cache_index]))
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{
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panicf("cache_fat_sector() - Could not write sector %d\n",
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secnum);
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}
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}
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fat_cache[cache_index].secnum = 8; /* Normally an unused sector */
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fat_cache[cache_index].dirty = false;
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fat_cache[cache_index].inuse = false;
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}
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/* Load the sector if it is not cached */
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if(!fat_cache[cache_index].inuse)
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{
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if(ata_read_sectors(secnum + fat_bpb.startsector,1,
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fat_cache_sectors[cache_index]))
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{
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DEBUGF( "cache_fat_sector() - Could not read sector %d\n", secnum);
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return NULL;
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}
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fat_cache[cache_index].inuse = true;
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fat_cache[cache_index].secnum = secnum;
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}
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return fat_cache_sectors[cache_index];
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}
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static int find_free_cluster(int startcluster)
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{
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int sector = startcluster / CLUSTERS_PER_FAT_SECTOR;
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int offset = startcluster % CLUSTERS_PER_FAT_SECTOR;
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int i;
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for (i = sector; i<fat_bpb.fatsize; i++) {
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int j;
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unsigned int* fat = cache_fat_sector(i);
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if ( !fat )
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break;
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for (j = offset; j < CLUSTERS_PER_FAT_SECTOR; j++)
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if (!(SWAB32(fat[j]) & 0x0fffffff)) {
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int c = i * CLUSTERS_PER_FAT_SECTOR + j;
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LDEBUGF("find_free_cluster(%x) == %x\n",startcluster,c);
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fat_bpb.fsinfo.nextfree = c;
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return c;
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}
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}
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LDEBUGF("find_free_cluster(%x) == 0\n",startcluster);
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return 0; /* 0 is an illegal cluster number */
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}
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static int update_fat_entry(unsigned int entry, unsigned int val)
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{
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int sector = entry / CLUSTERS_PER_FAT_SECTOR;
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int offset = entry % CLUSTERS_PER_FAT_SECTOR;
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unsigned int* sec;
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LDEBUGF("update_fat_entry(%x,%x)\n",entry,val);
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if (entry==val)
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panicf("Creating FAT loop: %x,%x\n",entry,val);
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if ( entry < 2 )
|
|
panicf("Updating reserved FAT entry %d.\n",entry);
|
|
|
|
sec = cache_fat_sector(sector);
|
|
if (!sec)
|
|
{
|
|
DEBUGF( "update_entry() - Could not cache sector %d\n", sector);
|
|
return -1;
|
|
}
|
|
fat_cache[sector & FAT_CACHE_MASK].dirty = true;
|
|
|
|
if ( val ) {
|
|
if (!(SWAB32(sec[offset]) & 0x0fffffff))
|
|
fat_bpb.fsinfo.freecount--;
|
|
}
|
|
else
|
|
fat_bpb.fsinfo.freecount++;
|
|
|
|
/* don't change top 4 bits */
|
|
sec[offset] &= SWAB32(0xf0000000);
|
|
sec[offset] |= SWAB32(val & 0x0fffffff);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int read_fat_entry(int entry)
|
|
{
|
|
int sector = entry / CLUSTERS_PER_FAT_SECTOR;
|
|
int offset = entry % CLUSTERS_PER_FAT_SECTOR;
|
|
unsigned int* sec;
|
|
|
|
sec = cache_fat_sector(sector);
|
|
if (!sec)
|
|
{
|
|
DEBUGF( "read_fat_entry() - Could not cache sector %d\n", sector);
|
|
return -1;
|
|
}
|
|
|
|
return SWAB32(sec[offset]) & 0x0fffffff;
|
|
}
|
|
|
|
static int get_next_cluster(unsigned int cluster)
|
|
{
|
|
int next_cluster;
|
|
|
|
next_cluster = read_fat_entry(cluster);
|
|
LDEBUGF("get_next_cluster(%x) == %x\n",cluster,next_cluster);
|
|
|
|
/* is this last cluster in chain? */
|
|
if ( next_cluster >= FAT_EOF_MARK )
|
|
return 0;
|
|
else
|
|
return next_cluster;
|
|
}
|
|
|
|
static int flush_fat(void)
|
|
{
|
|
int i;
|
|
int err;
|
|
unsigned char *sec;
|
|
int secnum;
|
|
unsigned char fsinfo[SECTOR_SIZE];
|
|
unsigned int* intptr;
|
|
|
|
LDEBUGF("flush_fat()\n");
|
|
|
|
for(i = 0;i < FAT_CACHE_SIZE;i++)
|
|
{
|
|
if(fat_cache[i].inuse && fat_cache[i].dirty)
|
|
{
|
|
secnum = fat_cache[i].secnum + fat_bpb.startsector;
|
|
LDEBUGF("Flushing FAT sector %x\n", secnum);
|
|
sec = fat_cache_sectors[i];
|
|
|
|
/* Write to the first FAT */
|
|
err = ata_write_sectors(secnum, 1, sec);
|
|
if(err)
|
|
{
|
|
DEBUGF( "flush_fat() - Couldn't write"
|
|
" sector (%d)\n", secnum);
|
|
return -1;
|
|
}
|
|
|
|
if(fat_bpb.bpb_numfats > 1 )
|
|
{
|
|
/* Write to the second FAT */
|
|
err = ata_write_sectors(secnum + fat_bpb.fatsize, 1, sec);
|
|
if (err)
|
|
{
|
|
DEBUGF( "flush_fat() - Couldn't write"
|
|
" sector (%d)\n", secnum + fat_bpb.fatsize);
|
|
return -2;
|
|
}
|
|
}
|
|
fat_cache[i].dirty = false;
|
|
}
|
|
}
|
|
|
|
/* update fsinfo */
|
|
err = ata_read_sectors(fat_bpb.startsector + fat_bpb.bpb_fsinfo, 1,fsinfo);
|
|
if (err)
|
|
{
|
|
DEBUGF( "flush_fat() - Couldn't read FSInfo (error code %d)\n", err);
|
|
return -1;
|
|
}
|
|
intptr = (int*)&(fsinfo[FSINFO_FREECOUNT]);
|
|
*intptr = SWAB32(fat_bpb.fsinfo.freecount);
|
|
|
|
intptr = (int*)&(fsinfo[FSINFO_NEXTFREE]);
|
|
*intptr = SWAB32(fat_bpb.fsinfo.nextfree);
|
|
|
|
err = ata_write_sectors(fat_bpb.startsector + fat_bpb.bpb_fsinfo,1,fsinfo);
|
|
if (err)
|
|
{
|
|
DEBUGF( "flush_fat() - Couldn't write FSInfo (error code %d)\n", err);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int getcurrdostime(unsigned short *dosdate,
|
|
unsigned short *dostime,
|
|
unsigned char *dostenth)
|
|
{
|
|
#if 0
|
|
struct tm *tm;
|
|
unsigned long now = time();
|
|
tm = localtime(&tb.time);
|
|
|
|
*dosdate = ((tm->tm_year - 80) << 9) |
|
|
((tm->tm_mon + 1) << 5) |
|
|
(tm->tm_mday);
|
|
|
|
*dostime = (tm->tm_hour << 11) |
|
|
(tm->tm_min << 5) |
|
|
(tm->tm_sec >> 1);
|
|
|
|
*dostenth = (tm->tm_sec & 1) * 100 + tb.millitm / 10;
|
|
#else
|
|
*dosdate = 0;
|
|
*dostime = 0;
|
|
*dostenth = 0;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static int add_dir_entry(struct fat_dir* dir,
|
|
struct fat_direntry* de,
|
|
struct fat_file* file)
|
|
{
|
|
unsigned char buf[SECTOR_SIZE];
|
|
unsigned char *eptr;
|
|
int i;
|
|
int err;
|
|
int sec;
|
|
int sec_cnt = 0;
|
|
bool need_to_update_last_empty_marker = false;
|
|
bool done = false;
|
|
unsigned char firstbyte;
|
|
int currdir = dir->startcluster;
|
|
bool is_rootdir = (currdir == 0);
|
|
|
|
LDEBUGF( "add_dir_entry(%x,%s,%x)\n",
|
|
dir->startcluster, de->name, file->firstcluster);
|
|
|
|
if (is_rootdir)
|
|
sec = fat_bpb.rootdirsector;
|
|
else
|
|
sec = first_sector_of_cluster(currdir);
|
|
|
|
while(!done)
|
|
{
|
|
if (sec_cnt >= fat_bpb.bpb_secperclus)
|
|
{
|
|
int oldcluster;
|
|
if (!currdir)
|
|
currdir = sec2cluster(fat_bpb.rootdirsector);
|
|
oldcluster = currdir;
|
|
|
|
/* We have reached the end of this cluster */
|
|
LDEBUGF("Moving to the next cluster...\n");
|
|
currdir = get_next_cluster(currdir);
|
|
if (!currdir)
|
|
{
|
|
/* end of dir, add new cluster */
|
|
LDEBUGF("Adding cluster to dir\n");
|
|
currdir = find_free_cluster(fat_bpb.fsinfo.nextfree);
|
|
if (!currdir) {
|
|
currdir = find_free_cluster(0);
|
|
if (!currdir) {
|
|
DEBUGF("add_dir_entry(): Disk full!\n");
|
|
return -1;
|
|
}
|
|
}
|
|
update_fat_entry(oldcluster, currdir);
|
|
}
|
|
LDEBUGF("new cluster is %x\n", currdir);
|
|
sec = cluster2sec(currdir);
|
|
}
|
|
|
|
LDEBUGF("Reading sector %x...\n", sec);
|
|
/* Read the next sector in the current dir */
|
|
err = ata_read_sectors(sec + fat_bpb.startsector,1,buf);
|
|
if (err)
|
|
{
|
|
DEBUGF( "add_dir_entry() - Couldn't read dir sector"
|
|
" (error code %d)\n", err);
|
|
return -2;
|
|
}
|
|
|
|
if (need_to_update_last_empty_marker)
|
|
{
|
|
/* All we need to do is to set the first entry to 0 */
|
|
LDEBUGF("Clearing the first entry in sector %x\n", sec);
|
|
buf[0] = 0;
|
|
done = true;
|
|
}
|
|
else
|
|
{
|
|
/* Look for a free slot */
|
|
for (i = 0; i < SECTOR_SIZE; i += DIR_ENTRY_SIZE)
|
|
{
|
|
firstbyte = buf[i];
|
|
if (firstbyte == 0xe5 || firstbyte == 0)
|
|
{
|
|
LDEBUGF("Found free entry %d in sector %x\n",
|
|
i/DIR_ENTRY_SIZE, sec);
|
|
eptr = &buf[i];
|
|
memset(eptr, 0, DIR_ENTRY_SIZE);
|
|
strncpy(&eptr[FATDIR_NAME], de->name, 11);
|
|
eptr[FATDIR_ATTR] = de->attr;
|
|
eptr[FATDIR_NTRES] = 0;
|
|
|
|
/* remember where the dir entry is located */
|
|
file->dirsector = sec;
|
|
file->direntry = i/DIR_ENTRY_SIZE;
|
|
|
|
/* Advance the last_empty_entry marker */
|
|
if (firstbyte == 0)
|
|
{
|
|
i += DIR_ENTRY_SIZE;
|
|
if (i < SECTOR_SIZE)
|
|
{
|
|
buf[i] = 0;
|
|
/* We are done */
|
|
done = true;
|
|
}
|
|
else
|
|
{
|
|
/* We must fill in the first entry
|
|
in the next sector */
|
|
need_to_update_last_empty_marker = true;
|
|
}
|
|
}
|
|
else
|
|
done = true;
|
|
|
|
err = ata_write_sectors(sec + fat_bpb.startsector,1,buf);
|
|
if (err)
|
|
{
|
|
DEBUGF( "add_dir_entry() - "
|
|
" Couldn't write dir"
|
|
" sector (error code %d)\n", err);
|
|
return -3;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
sec++;
|
|
sec_cnt++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
unsigned char char2dos(unsigned char c)
|
|
{
|
|
switch(c)
|
|
{
|
|
case 0xe5: /* Special kanji character */
|
|
c = 0x05;
|
|
break;
|
|
case 0x22:
|
|
case 0x2a:
|
|
case 0x2b:
|
|
case 0x2c:
|
|
case 0x2e:
|
|
case 0x3a:
|
|
case 0x3b:
|
|
case 0x3c:
|
|
case 0x3d:
|
|
case 0x3e:
|
|
case 0x3f:
|
|
case 0x5b:
|
|
case 0x5c:
|
|
case 0x5d:
|
|
case 0x7c:
|
|
/* Illegal name */
|
|
c = 0;
|
|
break;
|
|
|
|
default:
|
|
if(c < 0x20)
|
|
{
|
|
/* Illegal name */
|
|
c = 0;
|
|
}
|
|
break;
|
|
}
|
|
return c;
|
|
}
|
|
|
|
static int create_dos_name(unsigned char *name, unsigned char *newname)
|
|
{
|
|
unsigned char n[12];
|
|
unsigned char c;
|
|
int i;
|
|
char *ext;
|
|
|
|
strcpy(n, name);
|
|
|
|
ext = strchr(n, '.');
|
|
if(ext)
|
|
{
|
|
*ext++ = 0;
|
|
}
|
|
|
|
/* The file name is either empty, or there was only an extension.
|
|
In either case it is illegal. */
|
|
if(n[0] == 0)
|
|
{
|
|
return -2;
|
|
}
|
|
|
|
/* Name part */
|
|
for(i = 0;n[i] && (i < 8);i++)
|
|
{
|
|
c = char2dos(n[i]);
|
|
if(c)
|
|
{
|
|
newname[i] = toupper(c);
|
|
}
|
|
}
|
|
while(i < 8)
|
|
{
|
|
newname[i++] = ' ';
|
|
}
|
|
|
|
/* Extension part */
|
|
for (i = 0;ext && ext[i] && (i < 3);i++)
|
|
{
|
|
c = char2dos(ext[i]);
|
|
if (c)
|
|
{
|
|
newname[8+i] = toupper(c);
|
|
}
|
|
}
|
|
while(i < 3)
|
|
{
|
|
newname[8+i++] = ' ';
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void update_dir_entry( struct fat_file* file, int size )
|
|
{
|
|
unsigned char buf[SECTOR_SIZE];
|
|
int sector = file->dirsector + fat_bpb.startsector;
|
|
unsigned char* entry = buf + file->direntry * DIR_ENTRY_SIZE;
|
|
unsigned int* sizeptr;
|
|
unsigned short* clusptr;
|
|
int err;
|
|
|
|
LDEBUGF("update_dir_entry(cluster:%x entry:%d size:%d)\n",
|
|
file->firstcluster,file->direntry,size);
|
|
|
|
if ( file->direntry >= (SECTOR_SIZE / DIR_ENTRY_SIZE) ) {
|
|
DEBUGF("update_dir_entry(): Illegal entry %d!\n",file->direntry);
|
|
return;
|
|
}
|
|
|
|
err = ata_read_sectors(sector, 1, buf);
|
|
if (err)
|
|
{
|
|
DEBUGF( "update_dir_entry() - Couldn't read dir sector %d"
|
|
" (error code %d)\n", sector, err);
|
|
return;
|
|
}
|
|
|
|
if ( size == -1 ) {
|
|
/* mark entry deleted */
|
|
entry[0] = 0xe5;
|
|
}
|
|
else {
|
|
clusptr = (short*)(entry + FATDIR_FSTCLUSHI);
|
|
*clusptr = SWAB16(file->firstcluster >> 16);
|
|
|
|
clusptr = (short*)(entry + FATDIR_FSTCLUSLO);
|
|
*clusptr = SWAB16(file->firstcluster & 0xffff);
|
|
|
|
sizeptr = (int*)(entry + FATDIR_FILESIZE);
|
|
*sizeptr = SWAB32(size);
|
|
}
|
|
|
|
err = ata_write_sectors(sector, 1, buf);
|
|
if (err)
|
|
{
|
|
DEBUGF( "update_file_size() - Couldn't write dir sector %d"
|
|
" (error code %d)\n", sector, err);
|
|
return;
|
|
}
|
|
}
|
|
|
|
static int parse_direntry(struct fat_direntry *de, unsigned char *buf)
|
|
{
|
|
int i=0,j=0;
|
|
memset(de, 0, sizeof(struct fat_direntry));
|
|
de->attr = buf[FATDIR_ATTR];
|
|
de->crttimetenth = buf[FATDIR_CRTTIMETENTH];
|
|
de->crtdate = BYTES2INT16(buf,FATDIR_CRTDATE);
|
|
de->crttime = BYTES2INT16(buf,FATDIR_CRTTIME);
|
|
de->wrtdate = BYTES2INT16(buf,FATDIR_WRTDATE);
|
|
de->wrttime = BYTES2INT16(buf,FATDIR_WRTTIME);
|
|
de->filesize = BYTES2INT32(buf,FATDIR_FILESIZE);
|
|
de->firstcluster = BYTES2INT16(buf,FATDIR_FSTCLUSLO) |
|
|
(BYTES2INT16(buf,FATDIR_FSTCLUSHI) << 16);
|
|
|
|
/* fix the name */
|
|
for (i=0; (i<8) && (buf[FATDIR_NAME+i] != ' '); i++)
|
|
de->name[j++] = buf[FATDIR_NAME+i];
|
|
if ( buf[FATDIR_NAME+8] != ' ' ) {
|
|
de->name[j++] = '.';
|
|
for (i=8; (i<11) && (buf[FATDIR_NAME+i] != ' '); i++)
|
|
de->name[j++] = buf[FATDIR_NAME+i];
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
int fat_open(unsigned int startcluster,
|
|
struct fat_file *file,
|
|
struct fat_dir* dir)
|
|
{
|
|
file->firstcluster = startcluster;
|
|
file->lastcluster = startcluster;
|
|
file->lastsector = cluster2sec(startcluster);
|
|
file->sectornum = 0;
|
|
|
|
/* remember where the file's dir entry is located */
|
|
file->dirsector = dir->cached_sec;
|
|
file->direntry = (dir->entry % DIR_ENTRIES_PER_SECTOR) - 1;
|
|
LDEBUGF("fat_open: entry %d\n",file->direntry);
|
|
return 0;
|
|
}
|
|
|
|
int fat_create_file(char* name,
|
|
struct fat_file* file,
|
|
struct fat_dir* dir)
|
|
{
|
|
struct fat_direntry de;
|
|
int err;
|
|
|
|
LDEBUGF("fat_create_file(\"%s\",%x,%x)\n",name,file,dir);
|
|
memset(&de, 0, sizeof(struct fat_direntry));
|
|
if (create_dos_name(name, de.name) < 0)
|
|
{
|
|
DEBUGF( "fat_create_file() - Illegal file name (%s)\n", name);
|
|
return -1;
|
|
}
|
|
getcurrdostime(&de.crtdate, &de.crttime, &de.crttimetenth);
|
|
de.wrtdate = de.crtdate;
|
|
de.wrttime = de.crttime;
|
|
de.filesize = 0;
|
|
|
|
err = add_dir_entry(dir, &de, file);
|
|
if (!err) {
|
|
file->firstcluster = 0;
|
|
file->lastcluster = 0;
|
|
file->lastsector = 0;
|
|
file->sectornum = 0;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int fat_closewrite(struct fat_file *file, int size)
|
|
{
|
|
int next, last = file->lastcluster;
|
|
int endcluster = last;
|
|
|
|
LDEBUGF("fat_closewrite()\n");
|
|
|
|
last = get_next_cluster(last);
|
|
while ( last && last != FAT_EOF_MARK ) {
|
|
next = get_next_cluster(last);
|
|
update_fat_entry(last,0);
|
|
last = next;
|
|
}
|
|
|
|
update_fat_entry(endcluster, FAT_EOF_MARK);
|
|
update_dir_entry(file, size);
|
|
flush_fat();
|
|
|
|
return 0;
|
|
}
|
|
|
|
int fat_remove(struct fat_file* file)
|
|
{
|
|
int next, last = file->firstcluster;
|
|
|
|
LDEBUGF("fat_remove(%x)\n",last);
|
|
|
|
while ( last != FAT_EOF_MARK ) {
|
|
LDEBUGF("Freeing cluster %x\n",last);
|
|
next = get_next_cluster(last);
|
|
update_fat_entry(last,0);
|
|
last = next;
|
|
}
|
|
update_dir_entry(file, -1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int fat_readwrite( struct fat_file *file, int sectorcount,
|
|
void* buf, bool write )
|
|
{
|
|
int cluster = file->lastcluster;
|
|
int sector = file->lastsector;
|
|
int numsec = file->sectornum;
|
|
int first=0, last=0;
|
|
int err, i;
|
|
|
|
LDEBUGF( "fat_readwrite(file:%x,count:%d,buf:%x,%s)\n",
|
|
cluster,sectorcount,buf,write?"write":"read");
|
|
LDEBUGF( "fat_readwrite: c=%x s=%x n=%d\n", cluster,sector,numsec);
|
|
if ( sector == -1 )
|
|
return 0;
|
|
|
|
if ( write && !cluster) {
|
|
/* new file */
|
|
cluster = find_free_cluster(fat_bpb.fsinfo.nextfree);
|
|
if (!cluster) {
|
|
cluster = find_free_cluster(0);
|
|
if (!cluster) {
|
|
DEBUGF("fat_readwrite(): Disk full!\n");
|
|
return -3;
|
|
}
|
|
}
|
|
file->firstcluster = cluster;
|
|
sector = cluster2sec(cluster);
|
|
if (sector<0)
|
|
return -1;
|
|
}
|
|
|
|
/* find sequential sectors and read/write them all at once */
|
|
for (i=0; i<sectorcount && sector>=0; i++ ) {
|
|
if ( numsec >= fat_bpb.bpb_secperclus ) {
|
|
int oldcluster = cluster;
|
|
cluster = get_next_cluster(cluster);
|
|
if (!cluster) {
|
|
if ( write ) {
|
|
/* writing past end-of-file,
|
|
find a new free cluster to use. */
|
|
cluster = find_free_cluster(oldcluster+1);
|
|
if (!cluster) {
|
|
/* no free cluster found after last,
|
|
search from beginning */
|
|
cluster = find_free_cluster(0);
|
|
if (!cluster) {
|
|
/* no free clusters. disk is full. */
|
|
sector = -1;
|
|
DEBUGF("fat_readwrite(): Disk full!\n");
|
|
}
|
|
}
|
|
if ( cluster )
|
|
update_fat_entry(oldcluster, cluster);
|
|
}
|
|
else {
|
|
/* reading past end-of-file */
|
|
sector = -1;
|
|
}
|
|
}
|
|
|
|
if (cluster) {
|
|
sector = cluster2sec(cluster);
|
|
LDEBUGF("cluster2sec(%x) == %x\n",cluster,sector);
|
|
if (sector<0)
|
|
return -1;
|
|
numsec=0;
|
|
}
|
|
}
|
|
else
|
|
sector++;
|
|
numsec++;
|
|
|
|
if (!first)
|
|
first = sector;
|
|
if (!last)
|
|
last = sector;
|
|
|
|
if ( (sector != last+1) || /* not sequential any more? */
|
|
(i == sectorcount-1) || /* last sector requested? */
|
|
(last-first+1 == 256) ) { /* max 256 sectors per ata request */
|
|
int count = last-first+1;
|
|
if (write)
|
|
err = ata_write_sectors(first + fat_bpb.startsector, count, buf);
|
|
else
|
|
err = ata_read_sectors(first + fat_bpb.startsector, count, buf);
|
|
if (err) {
|
|
DEBUGF( "fat_readwrite() - Couldn't read sector %d"
|
|
" (error code %d)\n", sector,err);
|
|
return -2;
|
|
}
|
|
((char*)buf) += count * SECTOR_SIZE;
|
|
first = sector;
|
|
}
|
|
last = sector;
|
|
}
|
|
|
|
file->lastcluster = cluster;
|
|
file->lastsector = sector;
|
|
file->sectornum = numsec;
|
|
|
|
return sectorcount;
|
|
}
|
|
|
|
int fat_seek(struct fat_file *file, int seeksector )
|
|
{
|
|
int cluster = file->firstcluster;
|
|
int sector = cluster2sec(cluster);
|
|
int numsec = 0;
|
|
int i;
|
|
|
|
if ( seeksector ) {
|
|
for (i=0; i<seeksector; i++) {
|
|
numsec++;
|
|
if ( numsec >= fat_bpb.bpb_secperclus ) {
|
|
cluster = get_next_cluster(cluster);
|
|
if (!cluster)
|
|
{
|
|
/* end of file */
|
|
if (i == (seeksector-1))
|
|
{
|
|
/* seeksector is last sector in file */
|
|
sector = -1;
|
|
break;
|
|
}
|
|
else
|
|
/* attempting to seek beyond end of file */
|
|
return -1;
|
|
}
|
|
|
|
sector = cluster2sec(cluster);
|
|
if (sector<0)
|
|
return -2;
|
|
numsec=0;
|
|
}
|
|
else
|
|
sector++;
|
|
}
|
|
}
|
|
|
|
file->lastcluster = cluster;
|
|
file->lastsector = sector;
|
|
file->sectornum = numsec;
|
|
return 0;
|
|
}
|
|
|
|
int fat_opendir(struct fat_dir *dir, unsigned int startcluster)
|
|
{
|
|
int is_rootdir = (startcluster == 0);
|
|
unsigned int sec;
|
|
int err;
|
|
|
|
if(is_rootdir)
|
|
{
|
|
sec = fat_bpb.rootdirsector;
|
|
}
|
|
else
|
|
{
|
|
sec = first_sector_of_cluster(startcluster);
|
|
}
|
|
|
|
/* Read the first sector in the current dir */
|
|
err = ata_read_sectors(sec + fat_bpb.startsector,1,dir->cached_buf);
|
|
if(err)
|
|
{
|
|
DEBUGF( "fat_opendir() - Couldn't read dir sector"
|
|
" (error code %d)\n", err);
|
|
return -1;
|
|
}
|
|
|
|
dir->entry = 0;
|
|
dir->cached_sec = sec;
|
|
dir->num_sec = 0;
|
|
dir->startcluster = startcluster;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int fat_getnext(struct fat_dir *dir, struct fat_direntry *entry)
|
|
{
|
|
bool done = false;
|
|
int i;
|
|
int err;
|
|
unsigned char firstbyte;
|
|
int longarray[20];
|
|
int longs=0;
|
|
int sectoridx=0;
|
|
|
|
while(!done)
|
|
{
|
|
for (i = dir->entry; i < SECTOR_SIZE/DIR_ENTRY_SIZE; i++)
|
|
{
|
|
firstbyte = dir->cached_buf[i*DIR_ENTRY_SIZE];
|
|
|
|
if (firstbyte == 0xe5) {
|
|
/* free entry */
|
|
sectoridx = 0;
|
|
continue;
|
|
}
|
|
|
|
if (firstbyte == 0) {
|
|
/* last entry */
|
|
entry->name[0] = 0;
|
|
return 0;
|
|
}
|
|
|
|
/* longname entry? */
|
|
if ( ( dir->cached_buf[i*DIR_ENTRY_SIZE + FATDIR_ATTR] &
|
|
FAT_ATTR_LONG_NAME_MASK ) == FAT_ATTR_LONG_NAME ) {
|
|
longarray[longs++] = i*DIR_ENTRY_SIZE + sectoridx;
|
|
}
|
|
else {
|
|
if ( parse_direntry(entry,
|
|
&dir->cached_buf[i*DIR_ENTRY_SIZE]) ) {
|
|
|
|
/* don't return volume id entry */
|
|
if ( entry->attr == FAT_ATTR_VOLUME_ID )
|
|
continue;
|
|
|
|
/* replace shortname with longname? */
|
|
if ( longs ) {
|
|
int j,k,l=0;
|
|
/* iterate backwards through the dir entries */
|
|
for (j=longs-1; j>=0; j--) {
|
|
unsigned char* ptr = dir->cached_buf;
|
|
int index = longarray[j];
|
|
/* current or cached sector? */
|
|
if ( sectoridx >= SECTOR_SIZE ) {
|
|
if ( sectoridx >= SECTOR_SIZE*2 ) {
|
|
if ( ( index >= SECTOR_SIZE ) &&
|
|
( index < SECTOR_SIZE*2 ))
|
|
ptr = lastsector;
|
|
else
|
|
ptr = lastsector2;
|
|
}
|
|
else {
|
|
if ( index < SECTOR_SIZE )
|
|
ptr = lastsector;
|
|
}
|
|
|
|
index &= SECTOR_SIZE-1;
|
|
}
|
|
|
|
/* names are stored in unicode, but we
|
|
only grab the low byte (iso8859-1). */
|
|
for (k=0; k<5; k++)
|
|
entry->name[l++] = ptr[index + k*2 + 1];
|
|
for (k=0; k<6; k++)
|
|
entry->name[l++] = ptr[index + k*2 + 14];
|
|
for (k=0; k<2; k++)
|
|
entry->name[l++] = ptr[index + k*2 + 28];
|
|
}
|
|
entry->name[l]=0;
|
|
}
|
|
done = true;
|
|
sectoridx = 0;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* save this sector, for longname use */
|
|
if ( sectoridx )
|
|
memcpy( lastsector2, dir->cached_buf, SECTOR_SIZE );
|
|
else
|
|
memcpy( lastsector, dir->cached_buf, SECTOR_SIZE );
|
|
sectoridx += SECTOR_SIZE;
|
|
|
|
/* Next sector? */
|
|
if (i < SECTOR_SIZE / DIR_ENTRY_SIZE)
|
|
{
|
|
i++;
|
|
}
|
|
else
|
|
{
|
|
dir->num_sec++;
|
|
|
|
/* Do we need to advance one cluster? */
|
|
if (dir->num_sec < fat_bpb.bpb_secperclus)
|
|
{
|
|
dir->cached_sec++;
|
|
}
|
|
else
|
|
{
|
|
int cluster = sec2cluster(dir->cached_sec);
|
|
if ( cluster < 0 ) {
|
|
DEBUGF("sec2cluster failed\n");
|
|
return -1;
|
|
}
|
|
dir->num_sec = 0;
|
|
cluster = get_next_cluster( cluster );
|
|
if (!cluster)
|
|
{
|
|
DEBUGF("End of cluster chain.\n");
|
|
return -2;
|
|
}
|
|
dir->cached_sec = cluster2sec(cluster);
|
|
if ( dir->cached_sec < 0 )
|
|
{
|
|
DEBUGF("Invalid cluster: %d\n",cluster);
|
|
return -3;
|
|
}
|
|
|
|
}
|
|
|
|
/* Read the next sector */
|
|
err = ata_read_sectors(dir->cached_sec + fat_bpb.startsector, 1,
|
|
dir->cached_buf);
|
|
if (err)
|
|
{
|
|
DEBUGF( "fat_getnext() - Couldn't read dir sector"
|
|
" (error code %d)\n", err);
|
|
return -4;
|
|
}
|
|
|
|
i = 0;
|
|
}
|
|
dir->entry = i;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* -----------------------------------------------------------------
|
|
* local variables:
|
|
* eval: (load-file "../rockbox-mode.el")
|
|
* end:
|
|
*/
|