7aabb1ab66
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@2852 a1c6a512-1295-4272-9138-f99709370657
1497 lines
43 KiB
C
1497 lines
43 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 FATLONG_ORDER 0
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#define FATLONG_ATTR 11
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#define FATLONG_TYPE 12
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#define FATLONG_CHKSUM 13
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#define CLUSTERS_PER_FAT_SECTOR (SECTOR_SIZE / 4)
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#define DIR_ENTRIES_PER_SECTOR (SECTOR_SIZE / DIR_ENTRY_SIZE)
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#define DIR_ENTRY_SIZE 32
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#define NAME_BYTES_PER_ENTRY 13
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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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unsigned int freecount; /* last known free cluster count */
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unsigned int nextfree; /* first cluster to start looking for free
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clusters, 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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unsigned 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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unsigned int fatsize;
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unsigned int totalsectors;
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unsigned int rootdirsector;
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unsigned int firstdatasector;
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unsigned int startsector;
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unsigned int dataclusters;
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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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static int create_dos_name(unsigned char *name, unsigned char *newname);
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static unsigned int find_free_cluster(unsigned int start);
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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(unsigned 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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void fat_size(unsigned int* size, unsigned int* free)
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{
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if (size)
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*size = fat_bpb.dataclusters * fat_bpb.bpb_secperclus / 2;
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if (free)
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*free = fat_bpb.fsinfo.freecount * fat_bpb.bpb_secperclus / 2;
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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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unsigned 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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fat_bpb.dataclusters = 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 ( fat_bpb.dataclusters < 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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/* calculate freecount if unset */
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if ( fat_bpb.fsinfo.freecount == 0xffffffff )
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{
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int free = 0;
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for (i = 0; i<fat_bpb.fatsize; i++) {
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unsigned int j;
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unsigned int* fat = cache_fat_sector(i);
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for (j = 0; j < CLUSTERS_PER_FAT_SECTOR; j++) {
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unsigned int c = i * CLUSTERS_PER_FAT_SECTOR + j;
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if ( c > fat_bpb.dataclusters+1 ) /* nr 0 is unused */
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break;
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if (!(SWAB32(fat[j]) & 0x0fffffff)) {
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free++;
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if ( fat_bpb.fsinfo.nextfree == 0xffffffff )
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fat_bpb.fsinfo.nextfree = c;
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}
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}
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}
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fat_bpb.fsinfo.freecount = free;
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}
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LDEBUGF("Freecount: %d\n",fat_bpb.fsinfo.freecount);
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LDEBUGF("Nextfree: %x\n",fat_bpb.fsinfo.nextfree);
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LDEBUGF("Cluster count: %x\n",fat_bpb.dataclusters);
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LDEBUGF("Sectors per cluster: %d\n",fat_bpb.bpb_secperclus);
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LDEBUGF("FAT sectors: %x\n",fat_bpb.fatsize);
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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 > 128*1024)
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{
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DEBUGF( "bpb_is_sane() - Error: cluster size is larger than 128K "
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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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return -2;
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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 -3;
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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 -4;
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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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struct fat_cache_entry *fce = &fat_cache[cache_index];
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unsigned char *sectorbuf = &fat_cache_sectors[cache_index][0];
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/* Delete the cache entry if it isn't the sector we want */
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if(fce->inuse && fce->secnum != secnum)
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{
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/* Write back if it is dirty */
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if(fce->dirty)
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{
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if(ata_write_sectors(fce->secnum+fat_bpb.startsector, 1,
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sectorbuf))
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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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if(fat_bpb.bpb_numfats > 1)
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{
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/* Write to the second FAT */
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if(ata_write_sectors(fce->secnum+fat_bpb.startsector+
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fat_bpb.fatsize, 1, sectorbuf))
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{
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panicf("cache_fat_sector() - Could not write sector %d\n",
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secnum + fat_bpb.fatsize);
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}
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}
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}
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fce->secnum = 8; /* Normally an unused sector */
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fce->dirty = false;
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fce->inuse = false;
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}
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|
|
/* Load the sector if it is not cached */
|
|
if(!fce->inuse)
|
|
{
|
|
if(ata_read_sectors(secnum + fat_bpb.startsector,1,
|
|
sectorbuf))
|
|
{
|
|
DEBUGF( "cache_fat_sector() - Could not read sector %d\n", secnum);
|
|
return NULL;
|
|
}
|
|
fce->inuse = true;
|
|
fce->secnum = secnum;
|
|
}
|
|
return sectorbuf;
|
|
}
|
|
|
|
static unsigned int find_free_cluster(unsigned int startcluster)
|
|
{
|
|
unsigned int sector = startcluster / CLUSTERS_PER_FAT_SECTOR;
|
|
unsigned int offset = startcluster % CLUSTERS_PER_FAT_SECTOR;
|
|
unsigned int i;
|
|
|
|
/* don't waste time scanning if the disk is already full */
|
|
if (!fat_bpb.fsinfo.freecount)
|
|
return 0;
|
|
|
|
for (i = 0; i<fat_bpb.fatsize; i++) {
|
|
unsigned int j;
|
|
unsigned int nr = (i + sector) % fat_bpb.fatsize;
|
|
unsigned int* fat = cache_fat_sector(nr);
|
|
if ( !fat )
|
|
break;
|
|
for (j = 0; j < CLUSTERS_PER_FAT_SECTOR; j++) {
|
|
int k = (j + offset) % CLUSTERS_PER_FAT_SECTOR;
|
|
if (!(SWAB32(fat[k]) & 0x0fffffff)) {
|
|
unsigned int c = nr * CLUSTERS_PER_FAT_SECTOR + k;
|
|
if ( c > fat_bpb.dataclusters+1 ) /* nr 0 is unused */
|
|
continue;
|
|
LDEBUGF("find_free_cluster(%x) == %x\n",startcluster,c);
|
|
fat_bpb.fsinfo.nextfree = c;
|
|
return c;
|
|
}
|
|
}
|
|
offset = 0;
|
|
}
|
|
LDEBUGF("find_free_cluster(%x) == 0\n",startcluster);
|
|
return 0; /* 0 is an illegal cluster number */
|
|
}
|
|
|
|
static int update_fat_entry(unsigned int entry, unsigned int val)
|
|
{
|
|
int sector = entry / CLUSTERS_PER_FAT_SECTOR;
|
|
int offset = entry % CLUSTERS_PER_FAT_SECTOR;
|
|
unsigned int* sec;
|
|
|
|
LDEBUGF("update_fat_entry(%x,%x)\n",entry,val);
|
|
|
|
if (entry==val)
|
|
panicf("Creating FAT loop: %x,%x\n",entry,val);
|
|
|
|
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 {
|
|
if (SWAB32(sec[offset]) & 0x0fffffff)
|
|
fat_bpb.fsinfo.freecount++;
|
|
}
|
|
|
|
LDEBUGF("update_fat_entry: %d free clusters\n", 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(unsigned 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);
|
|
|
|
/* 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 -3;
|
|
}
|
|
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 -4;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int write_long_name(struct fat_file* file,
|
|
unsigned int firstentry,
|
|
unsigned int numentries,
|
|
unsigned char* name,
|
|
unsigned char* shortname)
|
|
{
|
|
unsigned char buf[SECTOR_SIZE];
|
|
unsigned char* entry;
|
|
unsigned int idx = firstentry % DIR_ENTRIES_PER_SECTOR;
|
|
unsigned int sector = firstentry / DIR_ENTRIES_PER_SECTOR;
|
|
unsigned int i, j=0, nameidx;
|
|
unsigned char chksum = 0;
|
|
unsigned int namelen = strlen(name);
|
|
int rc;
|
|
|
|
LDEBUGF("write_long_name(file:%x, first:%d, num:%d, name:%s)\n",
|
|
file->firstcluster, firstentry, numentries, name);
|
|
|
|
rc = fat_seek(file, sector);
|
|
if (rc<0)
|
|
return -1;
|
|
|
|
rc = fat_readwrite(file, 1, buf, false);
|
|
if (rc<1)
|
|
return -2;
|
|
|
|
/* calculate shortname checksum */
|
|
for (i=11; i>0; i--)
|
|
chksum = ((chksum & 1) ? 0x80 : 0) + (chksum >> 1) + shortname[j++];
|
|
|
|
/* calc position of last name segment */
|
|
for (nameidx=0;
|
|
nameidx < (namelen - NAME_BYTES_PER_ENTRY);
|
|
nameidx += NAME_BYTES_PER_ENTRY);
|
|
|
|
for (i=0; i < numentries; i++) {
|
|
/* new sector? */
|
|
if ( idx >= DIR_ENTRIES_PER_SECTOR ) {
|
|
/* update current sector */
|
|
rc = fat_seek(file, sector);
|
|
if (rc<0)
|
|
return -3;
|
|
|
|
rc = fat_readwrite(file, 1, buf, true);
|
|
if (rc<1)
|
|
return -4;
|
|
|
|
/* grab next sector */
|
|
rc = fat_readwrite(file, 1, buf, false);
|
|
if (rc<1)
|
|
return -5;
|
|
|
|
sector++;
|
|
idx = 0;
|
|
}
|
|
|
|
entry = buf + idx * DIR_ENTRY_SIZE;
|
|
|
|
/* verify this entry is free */
|
|
if (entry[0] && entry[0] != 0xe5 )
|
|
panicf("Dir entry %d in sector %x is not free! "
|
|
"%02x %02x %02x %02x",
|
|
idx, sector,
|
|
entry[0], entry[1], entry[2], entry[3]);
|
|
|
|
memset(entry, 0, DIR_ENTRY_SIZE);
|
|
if ( i+1 < numentries ) {
|
|
/* longname entry */
|
|
int k, l = nameidx;
|
|
entry[FATLONG_ORDER] = numentries-i-1;
|
|
if (i==0)
|
|
entry[FATLONG_ORDER] |= 0x40;
|
|
for (k=0; k<5 && name[l]; k++) entry[k*2 + 1] = name[l++];
|
|
for (k=0; k<6 && name[l]; k++) entry[k*2 + 14] = name[l++];
|
|
for (k=0; k<2 && name[l]; k++) entry[k*2 + 28] = name[l++];
|
|
entry[FATLONG_ATTR] = FAT_ATTR_LONG_NAME;
|
|
entry[FATLONG_CHKSUM] = chksum;
|
|
LDEBUGF("Longname entry %d: %.13s\n", idx, name+nameidx);
|
|
}
|
|
else {
|
|
/* shortname entry */
|
|
LDEBUGF("Shortname entry: %.13s\n", shortname);
|
|
strncpy(entry + FATDIR_NAME, shortname, 11);
|
|
entry[FATDIR_ATTR] = 0;
|
|
entry[FATDIR_NTRES] = 0;
|
|
}
|
|
idx++;
|
|
nameidx -= NAME_BYTES_PER_ENTRY;
|
|
//dbg_dump_buffer(buf, SECTOR_SIZE, 0);
|
|
}
|
|
|
|
/* update last sector */
|
|
rc = fat_seek(file, sector);
|
|
if (rc<0)
|
|
return -5;
|
|
|
|
rc = fat_readwrite(file, 1, buf, true);
|
|
if (rc<1)
|
|
return -6;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int add_dir_entry(struct fat_dir* dir,
|
|
struct fat_file* file,
|
|
char* name)
|
|
{
|
|
unsigned char buf[SECTOR_SIZE];
|
|
unsigned char shortname[16];
|
|
int err;
|
|
unsigned int sector;
|
|
bool done = false;
|
|
bool eof = false;
|
|
int entries_needed, entries_found = 0;
|
|
int namelen = strlen(name);
|
|
|
|
LDEBUGF( "add_dir_entry(%s,%x)\n",
|
|
name, file->firstcluster);
|
|
|
|
/* create dos name */
|
|
if (create_dos_name(name, shortname) < 0)
|
|
return -1;
|
|
|
|
/* one dir entry needed for every 13 bytes of filename,
|
|
plus one entry for the short name */
|
|
entries_needed = namelen / NAME_BYTES_PER_ENTRY + 1;
|
|
if (namelen % NAME_BYTES_PER_ENTRY)
|
|
entries_needed++;
|
|
|
|
err=fat_seek(&dir->file, 0);
|
|
if (err<0)
|
|
return -1;
|
|
|
|
for (sector=0; !done; sector++)
|
|
{
|
|
unsigned int i;
|
|
|
|
err = 0;
|
|
if (!eof) {
|
|
err = fat_readwrite(&dir->file, 1, buf, false);
|
|
}
|
|
if (err==0) {
|
|
/* eof: add new sector */
|
|
eof = true;
|
|
|
|
memset(buf, 0, sizeof buf);
|
|
LDEBUGF("Adding new sector to dir\n");
|
|
err=fat_seek(&dir->file, sector);
|
|
if (err<0)
|
|
return -2;
|
|
|
|
/* add sectors (we must clear the whole cluster) */
|
|
do {
|
|
err = fat_readwrite(&dir->file, 1, buf, true);
|
|
if (err<1)
|
|
return -3;
|
|
} while (dir->file.sectornum < (int)fat_bpb.bpb_secperclus);
|
|
}
|
|
if (err<0) {
|
|
DEBUGF( "add_dir_entry() - Couldn't read dir"
|
|
" (error code %d)\n", err);
|
|
return -4;
|
|
}
|
|
|
|
/* look for free slots */
|
|
for (i=0; i < DIR_ENTRIES_PER_SECTOR; i++)
|
|
{
|
|
unsigned char firstbyte = buf[i * DIR_ENTRY_SIZE];
|
|
switch (firstbyte) {
|
|
case 0: /* end of dir */
|
|
entries_found = entries_needed;
|
|
LDEBUGF("Found last entry %d\n",
|
|
sector * DIR_ENTRIES_PER_SECTOR + i);
|
|
break;
|
|
|
|
case 0xe5: /* free entry */
|
|
entries_found++;
|
|
LDEBUGF("Found free entry %d (%d/%d)\n",
|
|
sector * DIR_ENTRIES_PER_SECTOR + i,
|
|
entries_found, entries_needed);
|
|
break;
|
|
|
|
default:
|
|
entries_found = 0;
|
|
break;
|
|
}
|
|
|
|
if (entries_found == entries_needed)
|
|
{
|
|
int firstentry = sector * DIR_ENTRIES_PER_SECTOR + i;
|
|
|
|
/* if we're not extending the dir, we must go back to first
|
|
free entry */
|
|
if (firstbyte)
|
|
firstentry -= (entries_needed - 1);
|
|
|
|
LDEBUGF("Adding longname to entry %d in sector %d\n",
|
|
i, sector);
|
|
|
|
err = write_long_name(&dir->file, firstentry,
|
|
entries_needed, name, shortname);
|
|
if (err < 0)
|
|
return -5;
|
|
|
|
/* remember where the shortname dir entry is located */
|
|
file->dirsector = dir->file.lastsector;
|
|
file->direntry =
|
|
(i + entries_needed - 1) % DIR_ENTRIES_PER_SECTOR;
|
|
|
|
/* advance the last_empty_entry marker? */
|
|
if (firstbyte == 0)
|
|
{
|
|
i++;
|
|
if (i < DIR_ENTRIES_PER_SECTOR)
|
|
{
|
|
/* next entry is now last */
|
|
buf[i*DIR_ENTRY_SIZE] = 0;
|
|
}
|
|
else
|
|
{
|
|
/* add a new sector/cluster for last entry */
|
|
memset(buf, 0, sizeof buf);
|
|
do {
|
|
err = fat_readwrite(&dir->file, 1, buf, true);
|
|
if (err<1)
|
|
return -6;
|
|
} while (dir->file.sectornum <
|
|
(int)fat_bpb.bpb_secperclus);
|
|
}
|
|
}
|
|
done = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
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;
|
|
|
|
strncpy(n, name, sizeof n);
|
|
|
|
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++] = ' ';
|
|
}
|
|
|
|
newname[11] = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int update_file_size( 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_file_size(cluster:%x entry:%d sector:%x size:%d)\n",
|
|
file->firstcluster, file->direntry, file->dirsector, size);
|
|
|
|
if ( file->direntry >= DIR_ENTRIES_PER_SECTOR )
|
|
panicf("update_file_size(): Illegal entry %d!\n",file->direntry);
|
|
|
|
if ( file->direntry < 0 )
|
|
panicf("update_file_size(): Illegal entry %d!\n",file->direntry);
|
|
|
|
err = ata_read_sectors(sector, 1, buf);
|
|
if (err)
|
|
{
|
|
DEBUGF( "update_file_size() - Couldn't read dir sector %d"
|
|
" (error code %d)\n", sector, err);
|
|
return -1;
|
|
}
|
|
|
|
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 -2;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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 = 0;
|
|
file->sectornum = 0;
|
|
file->eof = false;
|
|
|
|
/* remember where the file's dir entry is located */
|
|
if ( dir ) {
|
|
file->dirsector = dir->sector;
|
|
file->direntry = dir->entry - 1;
|
|
}
|
|
LDEBUGF("fat_open(%x), entry %d\n",startcluster,file->direntry);
|
|
return 0;
|
|
}
|
|
|
|
int fat_create_file(char* name,
|
|
struct fat_file* file,
|
|
struct fat_dir* dir)
|
|
{
|
|
int err;
|
|
|
|
LDEBUGF("fat_create_file(\"%s\",%x,%x)\n",name,file,dir);
|
|
err = add_dir_entry(dir, file, name);
|
|
if (!err) {
|
|
file->firstcluster = 0;
|
|
file->lastcluster = 0;
|
|
file->lastsector = 0;
|
|
file->sectornum = 0;
|
|
file->eof = false;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int fat_truncate(struct fat_file *file)
|
|
{
|
|
/* truncate trailing clusters */
|
|
int next;
|
|
int last = file->lastcluster;
|
|
|
|
LDEBUGF("fat_truncate(%x, %x)\n", file->firstcluster, last);
|
|
|
|
for ( last = get_next_cluster(last); last; last = next ) {
|
|
next = get_next_cluster(last);
|
|
update_fat_entry(last,0);
|
|
}
|
|
if (file->lastcluster)
|
|
update_fat_entry(file->lastcluster,FAT_EOF_MARK);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int fat_closewrite(struct fat_file *file, int size)
|
|
{
|
|
LDEBUGF("fat_closewrite(size=%d)\n",size);
|
|
|
|
if (!size) {
|
|
/* empty file */
|
|
if ( file->firstcluster ) {
|
|
update_fat_entry(file->firstcluster, 0);
|
|
file->firstcluster = 0;
|
|
}
|
|
}
|
|
|
|
if (file->dirsector)
|
|
if (update_file_size(file, size) < 0)
|
|
return -1;
|
|
|
|
flush_fat();
|
|
|
|
#ifdef TEST_FAT
|
|
if ( file->firstcluster ) {
|
|
/* debug */
|
|
int count = 0;
|
|
int len;
|
|
int next;
|
|
for ( next = file->firstcluster; next;
|
|
next = get_next_cluster(next) )
|
|
LDEBUGF("cluster %d: %x\n", count++, next);
|
|
len = count * fat_bpb.bpb_secperclus * SECTOR_SIZE;
|
|
LDEBUGF("File is %d clusters (chainlen=%d, size=%d)\n",
|
|
count, len, size );
|
|
if ( len > size + fat_bpb.bpb_secperclus * SECTOR_SIZE)
|
|
panicf("Cluster chain is too long\n");
|
|
if ( len < size )
|
|
panicf("Cluster chain is too short\n");
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
int fat_remove(struct fat_file* file)
|
|
{
|
|
int next, last = file->firstcluster;
|
|
|
|
LDEBUGF("fat_remove(%x)\n",last);
|
|
|
|
while ( last ) {
|
|
next = get_next_cluster(last);
|
|
update_fat_entry(last,0);
|
|
last = next;
|
|
}
|
|
update_file_size(file, -1);
|
|
file->dirsector = 0;
|
|
file->firstcluster = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int next_write_cluster(struct fat_file* file,
|
|
int oldcluster,
|
|
int* newsector)
|
|
{
|
|
int cluster = 0;
|
|
int sector;
|
|
|
|
LDEBUGF("next_write_cluster(%x,%x)\n",file->firstcluster, oldcluster);
|
|
|
|
if (oldcluster)
|
|
cluster = get_next_cluster(oldcluster);
|
|
|
|
if (!cluster) {
|
|
if (oldcluster)
|
|
cluster = find_free_cluster(oldcluster+1);
|
|
else
|
|
cluster = find_free_cluster(fat_bpb.fsinfo.nextfree);
|
|
|
|
if (cluster) {
|
|
if (oldcluster)
|
|
update_fat_entry(oldcluster, cluster);
|
|
else
|
|
file->firstcluster = cluster;
|
|
update_fat_entry(cluster, FAT_EOF_MARK);
|
|
}
|
|
else {
|
|
#ifdef TEST_FAT
|
|
if (fat_bpb.fsinfo.freecount>0)
|
|
panicf("There is free space, but find_free_cluster() "
|
|
"didn't find it!\n");
|
|
#endif
|
|
DEBUGF("next_write_cluster(): Disk full!\n");
|
|
return 0;
|
|
}
|
|
}
|
|
sector = cluster2sec(cluster);
|
|
if (sector<0)
|
|
return 0;
|
|
|
|
*newsector = sector;
|
|
return cluster;
|
|
}
|
|
|
|
static bool transfer( unsigned int start, int count, char* buf, bool write )
|
|
{
|
|
int err;
|
|
|
|
LDEBUGF("transfer(s=%x, c=%x, %s)\n",start, count, write?"write":"read");
|
|
if (write) {
|
|
if (start < fat_bpb.firstdatasector)
|
|
panicf("Writing before data\n");
|
|
err = ata_write_sectors(start, count, buf);
|
|
}
|
|
else
|
|
err = ata_read_sectors(start, count, buf);
|
|
if (err) {
|
|
DEBUGF( "transfer() - Couldn't %s sector %x"
|
|
" (error code %d)\n",
|
|
write ? "write":"read", start, err);
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
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;
|
|
bool eof = file->eof;
|
|
int first=0, last=0;
|
|
int i;
|
|
|
|
LDEBUGF( "fat_readwrite(file:%x,count:0x%x,buf:%x,%s)\n",
|
|
file->firstcluster,sectorcount,buf,write?"write":"read");
|
|
LDEBUGF( "fat_readwrite: sec=%x numsec=%d eof=%d\n",
|
|
sector,numsec, eof?1:0);
|
|
|
|
if ( eof && !write)
|
|
return 0;
|
|
|
|
/* find sequential sectors and write them all at once */
|
|
for (i=0; (i < sectorcount) && (sector > -1); i++ ) {
|
|
numsec++;
|
|
if ( numsec > (int)fat_bpb.bpb_secperclus || !cluster ) {
|
|
int oldcluster = cluster;
|
|
if (write)
|
|
cluster = next_write_cluster(file, cluster, §or);
|
|
else {
|
|
cluster = get_next_cluster(cluster);
|
|
sector = cluster2sec(cluster);
|
|
}
|
|
if (!cluster) {
|
|
eof = true;
|
|
if ( write ) {
|
|
/* remember last cluster, in case
|
|
we want to append to the file */
|
|
cluster = oldcluster;
|
|
}
|
|
}
|
|
else
|
|
eof = false;
|
|
numsec=1;
|
|
}
|
|
else {
|
|
if (sector)
|
|
sector++;
|
|
else {
|
|
/* look up first sector of file */
|
|
sector = cluster2sec(file->firstcluster);
|
|
numsec=1;
|
|
}
|
|
}
|
|
|
|
if (!first)
|
|
first = sector;
|
|
|
|
if ( ((sector != first) && (sector != last+1)) || /* not sequential */
|
|
(last-first+1 == 256) ) { /* max 256 sectors per ata request */
|
|
int count = last - first + 1;
|
|
if (!transfer( first + fat_bpb.startsector, count, buf, write ))
|
|
return -2;
|
|
|
|
((char*)buf) += count * SECTOR_SIZE;
|
|
first = sector;
|
|
}
|
|
|
|
if ((i == sectorcount-1) && /* last sector requested */
|
|
(!eof))
|
|
{
|
|
int count = sector - first + 1;
|
|
if (!transfer( first + fat_bpb.startsector,
|
|
count, buf, write ))
|
|
return -2;
|
|
}
|
|
|
|
last = sector;
|
|
}
|
|
|
|
file->lastcluster = cluster;
|
|
file->lastsector = sector;
|
|
file->sectornum = numsec;
|
|
file->eof = eof;
|
|
|
|
/* if eof, don't report last block as read/written */
|
|
if (eof)
|
|
i--;
|
|
|
|
return i;
|
|
}
|
|
|
|
int fat_seek(struct fat_file *file, unsigned int seeksector )
|
|
{
|
|
int clusternum=0, sectornum=0, sector=0;
|
|
int cluster = file->firstcluster;
|
|
int i;
|
|
|
|
file->eof = false;
|
|
if (seeksector) {
|
|
/* we need to find the sector BEFORE the requested, since
|
|
the file struct stores the last accessed sector */
|
|
seeksector--;
|
|
clusternum = seeksector / fat_bpb.bpb_secperclus;
|
|
sectornum = seeksector % fat_bpb.bpb_secperclus;
|
|
|
|
|
|
for (i=0; i<clusternum; i++) {
|
|
cluster = get_next_cluster(cluster);
|
|
if (!cluster) {
|
|
DEBUGF("Seeking beyond the end of the file! "
|
|
"(sector %d, cluster %d)\n", seeksector, i);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
sector = cluster2sec(cluster) + sectornum;
|
|
}
|
|
else {
|
|
sectornum = -1;
|
|
}
|
|
|
|
LDEBUGF("fat_seek(%x, %x) == %x, %x, %x\n",
|
|
file->firstcluster, seeksector, cluster, sector, sectornum);
|
|
|
|
file->lastcluster = cluster;
|
|
file->lastsector = sector;
|
|
file->sectornum = sectornum + 1;
|
|
return 0;
|
|
}
|
|
|
|
int fat_opendir(struct fat_dir *dir, unsigned int startcluster)
|
|
{
|
|
int err;
|
|
|
|
if (startcluster == 0)
|
|
startcluster = sec2cluster(fat_bpb.rootdirsector);
|
|
|
|
err = fat_open(startcluster, &dir->file, NULL);
|
|
if(err)
|
|
{
|
|
DEBUGF( "fat_opendir() - Couldn't open dir"
|
|
" (error code %d)\n", err);
|
|
return -1;
|
|
}
|
|
|
|
dir->entry = 0;
|
|
dir->sector = 0;
|
|
|
|
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;
|
|
static unsigned char cached_buf[SECTOR_SIZE];
|
|
|
|
while(!done)
|
|
{
|
|
if ( dir->entry >= DIR_ENTRIES_PER_SECTOR || !dir->sector )
|
|
{
|
|
err = fat_readwrite(&dir->file, 1, cached_buf, false);
|
|
if (err==0) {
|
|
/* eof */
|
|
entry->name[0] = 0;
|
|
break;
|
|
}
|
|
if (err<0) {
|
|
DEBUGF( "fat_getnext() - Couldn't read dir"
|
|
" (error code %d)\n", err);
|
|
return -1;
|
|
}
|
|
dir->sector = dir->file.lastsector;
|
|
dir->entry = 0;
|
|
}
|
|
|
|
for (i = dir->entry % DIR_ENTRIES_PER_SECTOR;
|
|
i < DIR_ENTRIES_PER_SECTOR; i++)
|
|
{
|
|
unsigned int entrypos = i * DIR_ENTRY_SIZE;
|
|
|
|
firstbyte = cached_buf[entrypos];
|
|
dir->entry++;
|
|
|
|
if (firstbyte == 0xe5) {
|
|
/* free entry */
|
|
sectoridx = 0;
|
|
continue;
|
|
}
|
|
|
|
if (firstbyte == 0) {
|
|
/* last entry */
|
|
entry->name[0] = 0;
|
|
return 0;
|
|
}
|
|
|
|
/* longname entry? */
|
|
if ( ( cached_buf[entrypos + FATDIR_ATTR] &
|
|
FAT_ATTR_LONG_NAME_MASK ) == FAT_ATTR_LONG_NAME ) {
|
|
longarray[longs++] = entrypos + sectoridx;
|
|
}
|
|
else {
|
|
if ( parse_direntry(entry,
|
|
&cached_buf[entrypos]) ) {
|
|
|
|
/* 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 = 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;
|
|
i++;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* save this sector, for longname use */
|
|
if ( sectoridx )
|
|
memcpy( lastsector2, cached_buf, SECTOR_SIZE );
|
|
else
|
|
memcpy( lastsector, cached_buf, SECTOR_SIZE );
|
|
sectoridx += SECTOR_SIZE;
|
|
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* -----------------------------------------------------------------
|
|
* local variables:
|
|
* eval: (load-file "../rockbox-mode.el")
|
|
* end:
|
|
*/
|