dc7534bdb2
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5701 a1c6a512-1295-4272-9138-f99709370657
2398 lines
73 KiB
C
2398 lines
73 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 <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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#include "timefuncs.h"
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#include "kernel.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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((long)array[pos] | ((long)array[pos+1] << 8 ) | \
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((long)array[pos+2] << 16 ) | ((long)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_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 CLUSTERS_PER_FAT16_SECTOR (SECTOR_SIZE / 2)
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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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/* filename charset conversion table */
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static const unsigned char unicode2iso8859_2[] = {
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0x00, 0x00, 0xc3, 0xe3, 0xa1, 0xb1, 0xc6, 0xe6, /* 0x0100 */
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0x00, 0x00, 0x00, 0x00, 0xc8, 0xe8, 0xcf, 0xef, /* 0x0108 */
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0xd0, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0110 */
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0xca, 0xea, 0xcc, 0xec, 0x00, 0x00, 0x00, 0x00, /* 0x0118 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0120 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0128 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0130 */
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0x00, 0xc5, 0xe5, 0x00, 0x00, 0xa5, 0xb5, 0x00, /* 0x0138 */
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0x00, 0xa3, 0xb3, 0xd1, 0xf1, 0x00, 0x00, 0xd2, /* 0x0140 */
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0xf2, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0148 */
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0xd5, 0xf5, 0x00, 0x00, 0xc0, 0xe0, 0x00, 0x00, /* 0x0150 */
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0xd8, 0xf8, 0xa6, 0xb6, 0x00, 0x00, 0xaa, 0xba, /* 0x0158 */
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0xa9, 0xb9, 0xde, 0xfe, 0xab, 0xbb, 0x00, 0x00, /* 0x0160 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xd9, 0xf9, /* 0x0168 */
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0xdb, 0xfb, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0170 */
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0x00, 0xac, 0xbc, 0xaf, 0xbf, 0xae, 0xbe, 0x00, /* 0x0178 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0180 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0188 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0190 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0198 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01a0 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01a8 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01b0 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01b8 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01c0 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01c8 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01d0 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01d8 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01e0 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01e8 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01f0 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01f8 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0200 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0208 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0210 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0218 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0220 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0228 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0230 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0238 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0240 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0248 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0250 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0258 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0260 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0268 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0270 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0278 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0280 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0288 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0290 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0298 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x02a0 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x02a8 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x02b0 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x02b8 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xb7, /* 0x02c0 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x02c8 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x02d0 */
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0xa2, 0xff, 0x00, 0xb2, 0x00, 0xbd, 0x00, 0x00, /* 0x02d8 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x02e0 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x02e8 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x02f0 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 /* 0x02f8 */
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};
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struct fsinfo {
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unsigned long freecount; /* last known free cluster count */
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unsigned long 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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int bpb_bytspersec; /* Bytes per sector, 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_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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unsigned long bpb_totsec32; /* Number of sectors on the volume
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(new 32-bit) */
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unsigned int last_word; /* 0xAA55 */
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/**** FAT32 specific *****/
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long bpb_fatsz32;
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long bpb_rootclus;
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long bpb_fsinfo;
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/* variables for internal use */
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unsigned long fatsize;
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unsigned long totalsectors;
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unsigned long rootdirsector;
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unsigned long firstdatasector;
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unsigned long startsector;
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unsigned long dataclusters;
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struct fsinfo fsinfo;
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#ifdef HAVE_FAT16SUPPORT
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int bpb_rootentcnt; /* Number of dir entries in the root */
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/* internals for FAT16 support */
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bool is_fat16; /* true if we mounted a FAT16 partition, false if FAT32 */
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unsigned int rootdiroffset; /* sector offset of root dir relative to start
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* of first pseudo cluster */
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#endif /* #ifdef HAVE_FAT16SUPPORT */
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#ifdef HAVE_MULTIVOLUME
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int drive; /* on which physical device is this located */
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bool mounted; /* flag if this volume is mounted */
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#endif
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};
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static struct bpb fat_bpbs[NUM_VOLUMES]; /* mounted partition info */
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static int update_fsinfo(IF_MV_NONVOID(struct bpb* fat_bpb));
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static int flush_fat(IF_MV_NONVOID(struct bpb* fat_bpb));
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static int bpb_is_sane(IF_MV_NONVOID(struct bpb* fat_bpb));
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static void *cache_fat_sector(IF_MV2(struct bpb* fat_bpb,) long secnum, bool dirty);
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static int create_dos_name(const unsigned char *name, unsigned char *newname);
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static unsigned long find_free_cluster(IF_MV2(struct bpb* fat_bpb,) unsigned long start);
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static int transfer(IF_MV2(struct bpb* fat_bpb,) unsigned long start, long count, char* buf, bool write );
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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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#ifdef HAVE_MULTIVOLUME
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struct bpb* fat_vol ; /* shared cache for all volumes */
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#endif
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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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static struct mutex cache_mutex;
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static long cluster2sec(IF_MV2(struct bpb* fat_bpb,) long cluster)
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{
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#ifndef HAVE_MULTIVOLUME
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struct bpb* fat_bpb = &fat_bpbs[0];
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#endif
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#ifdef HAVE_FAT16SUPPORT
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/* negative clusters (FAT16 root dir) don't get the 2 offset */
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int zerocluster = cluster < 0 ? 0 : 2;
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#else
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const long zerocluster = 2;
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#endif
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long 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 (%ld)\n", cluster);
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return -1;
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}
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return (cluster - zerocluster) * fat_bpb->bpb_secperclus
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+ fat_bpb->firstdatasector;
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}
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long fat_startsector(IF_MV_NONVOID(int volume))
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{
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#ifndef HAVE_MULTIVOLUME
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const int volume = 0;
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#endif
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struct bpb* fat_bpb = &fat_bpbs[volume];
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return fat_bpb->startsector;
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}
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void fat_size(IF_MV2(int volume,) unsigned long* size, unsigned long* free)
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{
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#ifndef HAVE_MULTIVOLUME
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const int volume = 0;
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#endif
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struct bpb* fat_bpb = &fat_bpbs[volume];
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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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void fat_init(void)
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{
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unsigned int i;
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mutex_init(&cache_mutex);
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/* mark the FAT cache as unused */
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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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#ifdef HAVE_MULTIVOLUME
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fat_cache[i].fat_vol = NULL;
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#endif
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}
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#ifdef HAVE_MULTIVOLUME
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/* mark the possible volumes as not mounted */
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for (i=0; i<NUM_VOLUMES;i++)
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{
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fat_bpbs[i].mounted = false;
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}
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#endif
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}
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int fat_mount(IF_MV2(int volume,) IF_MV2(int drive,) long startsector)
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{
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#ifndef HAVE_MULTIVOLUME
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const int volume = 0;
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#endif
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struct bpb* fat_bpb = &fat_bpbs[volume];
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unsigned char buf[SECTOR_SIZE];
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int rc;
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long datasec;
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#ifdef HAVE_FAT16SUPPORT
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int rootdirsectors;
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#endif
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/* Read the sector */
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rc = ata_read_sectors(IF_MV2(drive,) startsector,1,buf);
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if(rc)
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{
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DEBUGF( "fat_mount() - Couldn't read BPB (error code %d)\n", rc);
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return rc * 10 - 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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#ifdef HAVE_MULTIVOLUME
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fat_bpb->drive = drive;
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#endif
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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);
|
|
fat_bpb->bpb_totsec32 = BYTES2INT32(buf,BPB_TOTSEC32);
|
|
fat_bpb->last_word = BYTES2INT16(buf,BPB_LAST_WORD);
|
|
|
|
/* calculate a few commonly used values */
|
|
if (fat_bpb->bpb_fatsz16 != 0)
|
|
fat_bpb->fatsize = fat_bpb->bpb_fatsz16;
|
|
else
|
|
fat_bpb->fatsize = fat_bpb->bpb_fatsz32;
|
|
|
|
if (fat_bpb->bpb_totsec16 != 0)
|
|
fat_bpb->totalsectors = fat_bpb->bpb_totsec16;
|
|
else
|
|
fat_bpb->totalsectors = fat_bpb->bpb_totsec32;
|
|
|
|
#ifdef HAVE_FAT16SUPPORT
|
|
fat_bpb->bpb_rootentcnt = BYTES2INT16(buf,BPB_ROOTENTCNT);
|
|
rootdirsectors = ((fat_bpb->bpb_rootentcnt * 32)
|
|
+ (fat_bpb->bpb_bytspersec - 1)) / fat_bpb->bpb_bytspersec;
|
|
#endif /* #ifdef HAVE_FAT16SUPPORT */
|
|
|
|
fat_bpb->firstdatasector = fat_bpb->bpb_rsvdseccnt
|
|
#ifdef HAVE_FAT16SUPPORT
|
|
+ rootdirsectors
|
|
#endif
|
|
+ fat_bpb->bpb_numfats * fat_bpb->fatsize;
|
|
|
|
/* Determine FAT type */
|
|
datasec = fat_bpb->totalsectors - fat_bpb->firstdatasector;
|
|
fat_bpb->dataclusters = datasec / fat_bpb->bpb_secperclus;
|
|
|
|
#ifdef TEST_FAT
|
|
/*
|
|
we are sometimes testing with "illegally small" fat32 images,
|
|
so we don't use the proper fat32 test case for test code
|
|
*/
|
|
if ( fat_bpb->bpb_fatsz16 )
|
|
#else
|
|
if ( fat_bpb->dataclusters < 65525 )
|
|
#endif
|
|
{ /* FAT16 */
|
|
#ifdef HAVE_FAT16SUPPORT
|
|
fat_bpb->is_fat16 = true;
|
|
if (fat_bpb->dataclusters < 4085)
|
|
{ /* FAT12 */
|
|
DEBUGF("This is FAT12. Go away!\n");
|
|
return -2;
|
|
}
|
|
#else /* #ifdef HAVE_FAT16SUPPORT */
|
|
DEBUGF("This is not FAT32. Go away!\n");
|
|
return -2;
|
|
#endif /* #ifndef HAVE_FAT16SUPPORT */
|
|
}
|
|
|
|
#ifdef HAVE_FAT16SUPPORT
|
|
if (fat_bpb->is_fat16)
|
|
{ /* FAT16 specific part of BPB */
|
|
int dirclusters;
|
|
fat_bpb->rootdirsector = fat_bpb->bpb_rsvdseccnt
|
|
+ fat_bpb->bpb_numfats * fat_bpb->bpb_fatsz16;
|
|
dirclusters = ((rootdirsectors + fat_bpb->bpb_secperclus - 1)
|
|
/ fat_bpb->bpb_secperclus); /* rounded up, to full clusters */
|
|
/* I assign negative pseudo cluster numbers for the root directory,
|
|
their range is counted upward until -1. */
|
|
fat_bpb->bpb_rootclus = 0 - dirclusters; /* backwards, before the data */
|
|
fat_bpb->rootdiroffset = dirclusters * fat_bpb->bpb_secperclus
|
|
- rootdirsectors;
|
|
}
|
|
else
|
|
#endif /* #ifdef HAVE_FAT16SUPPORT */
|
|
{ /* FAT32 specific part of BPB */
|
|
fat_bpb->bpb_rootclus = BYTES2INT32(buf,BPB_ROOTCLUS);
|
|
fat_bpb->bpb_fsinfo = BYTES2INT16(buf,BPB_FSINFO);
|
|
fat_bpb->rootdirsector = cluster2sec(IF_MV2(fat_bpb,) fat_bpb->bpb_rootclus);
|
|
}
|
|
|
|
rc = bpb_is_sane(IF_MV(fat_bpb));
|
|
if (rc < 0)
|
|
{
|
|
DEBUGF( "fat_mount() - BPB is not sane\n");
|
|
return rc * 10 - 3;
|
|
}
|
|
|
|
#ifdef HAVE_FAT16SUPPORT
|
|
if (fat_bpb->is_fat16)
|
|
{
|
|
fat_bpb->fsinfo.freecount = 0xffffffff; /* force recalc below */
|
|
fat_bpb->fsinfo.nextfree = 0xffffffff;
|
|
}
|
|
else
|
|
#endif /* #ifdef HAVE_FAT16SUPPORT */
|
|
{
|
|
/* Read the fsinfo sector */
|
|
rc = ata_read_sectors(IF_MV2(drive,)
|
|
startsector + fat_bpb->bpb_fsinfo, 1, buf);
|
|
if (rc < 0)
|
|
{
|
|
DEBUGF( "fat_mount() - Couldn't read FSInfo (error code %d)\n", rc);
|
|
return rc * 10 - 4;
|
|
}
|
|
fat_bpb->fsinfo.freecount = BYTES2INT32(buf, FSINFO_FREECOUNT);
|
|
fat_bpb->fsinfo.nextfree = BYTES2INT32(buf, FSINFO_NEXTFREE);
|
|
}
|
|
|
|
/* calculate freecount if unset */
|
|
if ( fat_bpb->fsinfo.freecount == 0xffffffff )
|
|
{
|
|
fat_recalc_free(IF_MV(volume));
|
|
}
|
|
|
|
LDEBUGF("Freecount: %ld\n",fat_bpb->fsinfo.freecount);
|
|
LDEBUGF("Nextfree: 0x%lx\n",fat_bpb->fsinfo.nextfree);
|
|
LDEBUGF("Cluster count: 0x%lx\n",fat_bpb->dataclusters);
|
|
LDEBUGF("Sectors per cluster: %d\n",fat_bpb->bpb_secperclus);
|
|
LDEBUGF("FAT sectors: 0x%lx\n",fat_bpb->fatsize);
|
|
|
|
#ifdef HAVE_MULTIVOLUME
|
|
fat_bpb->mounted = true;
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef HAVE_HOTSWAP
|
|
int fat_unmount(int volume, bool flush)
|
|
{
|
|
int rc;
|
|
struct bpb* fat_bpb = &fat_bpbs[volume];
|
|
|
|
if(flush)
|
|
{
|
|
rc = flush_fat(fat_bpb); /* the clean way, while still alive */
|
|
}
|
|
else
|
|
{ /* volume is not accessible any more, e.g. MMC removed */
|
|
int i;
|
|
mutex_lock(&cache_mutex);
|
|
for(i = 0;i < FAT_CACHE_SIZE;i++)
|
|
{
|
|
struct fat_cache_entry *fce = &fat_cache[i];
|
|
if(fce->inuse && fce->fat_vol == fat_bpb)
|
|
{
|
|
fce->inuse = false; /* discard all from that volume */
|
|
fce->dirty = false;
|
|
}
|
|
}
|
|
mutex_unlock(&cache_mutex);
|
|
rc = 0;
|
|
}
|
|
fat_bpb->mounted = false;
|
|
return rc;
|
|
}
|
|
#endif /* #ifdef HAVE_HOTSWAP */
|
|
|
|
void fat_recalc_free(IF_MV_NONVOID(int volume))
|
|
{
|
|
#ifndef HAVE_MULTIVOLUME
|
|
const int volume = 0;
|
|
#endif
|
|
struct bpb* fat_bpb = &fat_bpbs[volume];
|
|
long free = 0;
|
|
unsigned long i;
|
|
#ifdef HAVE_FAT16SUPPORT
|
|
if (fat_bpb->is_fat16)
|
|
{
|
|
for (i = 0; i<fat_bpb->fatsize; i++) {
|
|
unsigned int j;
|
|
unsigned short* fat = cache_fat_sector(IF_MV2(fat_bpb,) i, false);
|
|
for (j = 0; j < CLUSTERS_PER_FAT16_SECTOR; j++) {
|
|
unsigned int c = i * CLUSTERS_PER_FAT16_SECTOR + j;
|
|
if ( c > fat_bpb->dataclusters+1 ) /* nr 0 is unused */
|
|
break;
|
|
|
|
if (SWAB16(fat[j]) == 0x0000) {
|
|
free++;
|
|
if ( fat_bpb->fsinfo.nextfree == 0xffffffff )
|
|
fat_bpb->fsinfo.nextfree = c;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
#endif /* #ifdef HAVE_FAT16SUPPORT */
|
|
{
|
|
for (i = 0; i<fat_bpb->fatsize; i++) {
|
|
unsigned int j;
|
|
unsigned long* fat = cache_fat_sector(IF_MV2(fat_bpb,) i, false);
|
|
for (j = 0; j < CLUSTERS_PER_FAT_SECTOR; j++) {
|
|
unsigned long c = i * CLUSTERS_PER_FAT_SECTOR + j;
|
|
if ( c > fat_bpb->dataclusters+1 ) /* nr 0 is unused */
|
|
break;
|
|
|
|
if (!(SWAB32(fat[j]) & 0x0fffffff)) {
|
|
free++;
|
|
if ( fat_bpb->fsinfo.nextfree == 0xffffffff )
|
|
fat_bpb->fsinfo.nextfree = c;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
fat_bpb->fsinfo.freecount = free;
|
|
update_fsinfo(IF_MV(fat_bpb));
|
|
}
|
|
|
|
static int bpb_is_sane(IF_MV_NONVOID(struct bpb* fat_bpb))
|
|
{
|
|
#ifndef HAVE_MULTIVOLUME
|
|
struct bpb* fat_bpb = &fat_bpbs[0];
|
|
#endif
|
|
if(fat_bpb->bpb_bytspersec != 512)
|
|
{
|
|
DEBUGF( "bpb_is_sane() - Error: sector size is not 512 (%d)\n",
|
|
fat_bpb->bpb_bytspersec);
|
|
return -1;
|
|
}
|
|
if((long)fat_bpb->bpb_secperclus * (long)fat_bpb->bpb_bytspersec > 128L*1024L)
|
|
{
|
|
DEBUGF( "bpb_is_sane() - Error: cluster size is larger than 128K "
|
|
"(%d * %d = %d)\n",
|
|
fat_bpb->bpb_bytspersec, fat_bpb->bpb_secperclus,
|
|
fat_bpb->bpb_bytspersec * fat_bpb->bpb_secperclus);
|
|
return -2;
|
|
}
|
|
if(fat_bpb->bpb_numfats != 2)
|
|
{
|
|
DEBUGF( "bpb_is_sane() - Warning: NumFATS is not 2 (%d)\n",
|
|
fat_bpb->bpb_numfats);
|
|
}
|
|
if(fat_bpb->bpb_media != 0xf0 && fat_bpb->bpb_media < 0xf8)
|
|
{
|
|
DEBUGF( "bpb_is_sane() - Warning: Non-standard "
|
|
"media type (0x%02x)\n",
|
|
fat_bpb->bpb_media);
|
|
}
|
|
if(fat_bpb->last_word != 0xaa55)
|
|
{
|
|
DEBUGF( "bpb_is_sane() - Error: Last word is not "
|
|
"0xaa55 (0x%04x)\n", fat_bpb->last_word);
|
|
return -3;
|
|
}
|
|
|
|
if (fat_bpb->fsinfo.freecount >
|
|
(fat_bpb->totalsectors - fat_bpb->firstdatasector)/
|
|
fat_bpb->bpb_secperclus)
|
|
{
|
|
DEBUGF( "bpb_is_sane() - Error: FSInfo.Freecount > disk size "
|
|
"(0x%04lx)\n", fat_bpb->fsinfo.freecount);
|
|
return -4;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void flush_fat_sector(struct fat_cache_entry *fce,
|
|
unsigned char *sectorbuf)
|
|
{
|
|
int rc;
|
|
int secnum;
|
|
|
|
/* With multivolume, use only the FAT info from the cached sector! */
|
|
#ifdef HAVE_MULTIVOLUME
|
|
secnum = fce->secnum + fce->fat_vol->startsector;
|
|
#else
|
|
secnum = fce->secnum + fat_bpbs[0].startsector;
|
|
#endif
|
|
|
|
/* Write to the first FAT */
|
|
rc = ata_write_sectors(IF_MV2(fce->fat_vol->drive,)
|
|
secnum, 1,
|
|
sectorbuf);
|
|
if(rc < 0)
|
|
{
|
|
panicf("flush_fat_sector() - Could not write sector %d"
|
|
" (error %d)\n",
|
|
secnum, rc);
|
|
}
|
|
#ifdef HAVE_MULTIVOLUME
|
|
if(fce->fat_vol->bpb_numfats > 1)
|
|
#else
|
|
if(fat_bpbs[0].bpb_numfats > 1)
|
|
#endif
|
|
{
|
|
/* Write to the second FAT */
|
|
#ifdef HAVE_MULTIVOLUME
|
|
secnum += fce->fat_vol->fatsize;
|
|
#else
|
|
secnum += fat_bpbs[0].fatsize;
|
|
#endif
|
|
rc = ata_write_sectors(IF_MV2(fce->fat_vol->drive,)
|
|
secnum, 1, sectorbuf);
|
|
if(rc < 0)
|
|
{
|
|
panicf("flush_fat_sector() - Could not write sector %d"
|
|
" (error %d)\n",
|
|
secnum, rc);
|
|
}
|
|
}
|
|
fce->dirty = false;
|
|
}
|
|
|
|
/* Note: The returned pointer is only safely valid until the next
|
|
task switch! (Any subsequent ata read/write may yield.) */
|
|
static void *cache_fat_sector(IF_MV2(struct bpb* fat_bpb,)
|
|
long fatsector, bool dirty)
|
|
{
|
|
#ifndef HAVE_MULTIVOLUME
|
|
struct bpb* fat_bpb = &fat_bpbs[0];
|
|
#endif
|
|
long secnum = fatsector + fat_bpb->bpb_rsvdseccnt;
|
|
int cache_index = secnum & FAT_CACHE_MASK;
|
|
struct fat_cache_entry *fce = &fat_cache[cache_index];
|
|
unsigned char *sectorbuf = &fat_cache_sectors[cache_index][0];
|
|
int rc;
|
|
|
|
mutex_lock(&cache_mutex); /* make changes atomic */
|
|
|
|
/* Delete the cache entry if it isn't the sector we want */
|
|
if(fce->inuse && (fce->secnum != secnum
|
|
#ifdef HAVE_MULTIVOLUME
|
|
|| fce->fat_vol != fat_bpb
|
|
#endif
|
|
))
|
|
{
|
|
/* Write back if it is dirty */
|
|
if(fce->dirty)
|
|
{
|
|
flush_fat_sector(fce, sectorbuf);
|
|
}
|
|
fce->inuse = false;
|
|
}
|
|
|
|
/* Load the sector if it is not cached */
|
|
if(!fce->inuse)
|
|
{
|
|
rc = ata_read_sectors(IF_MV2(fat_bpb->drive,)
|
|
secnum + fat_bpb->startsector,1,
|
|
sectorbuf);
|
|
if(rc < 0)
|
|
{
|
|
DEBUGF( "cache_fat_sector() - Could not read sector %ld"
|
|
" (error %d)\n", secnum, rc);
|
|
mutex_unlock(&cache_mutex);
|
|
return NULL;
|
|
}
|
|
fce->inuse = true;
|
|
fce->secnum = secnum;
|
|
#ifdef HAVE_MULTIVOLUME
|
|
fce->fat_vol = fat_bpb;
|
|
#endif
|
|
}
|
|
if (dirty)
|
|
fce->dirty = true; /* dirt remains, sticky until flushed */
|
|
mutex_unlock(&cache_mutex);
|
|
return sectorbuf;
|
|
}
|
|
|
|
static unsigned long find_free_cluster(IF_MV2(struct bpb* fat_bpb,) unsigned long startcluster)
|
|
{
|
|
#ifndef HAVE_MULTIVOLUME
|
|
struct bpb* fat_bpb = &fat_bpbs[0];
|
|
#endif
|
|
unsigned long sector;
|
|
unsigned long offset;
|
|
unsigned long i;
|
|
|
|
#ifdef HAVE_FAT16SUPPORT
|
|
if (fat_bpb->is_fat16)
|
|
{
|
|
sector = startcluster / CLUSTERS_PER_FAT16_SECTOR;
|
|
offset = startcluster % CLUSTERS_PER_FAT16_SECTOR;
|
|
|
|
for (i = 0; i<fat_bpb->fatsize; i++) {
|
|
unsigned int j;
|
|
unsigned int nr = (i + sector) % fat_bpb->fatsize;
|
|
unsigned short* fat = cache_fat_sector(IF_MV2(fat_bpb,) nr, false);
|
|
if ( !fat )
|
|
break;
|
|
for (j = 0; j < CLUSTERS_PER_FAT16_SECTOR; j++) {
|
|
int k = (j + offset) % CLUSTERS_PER_FAT16_SECTOR;
|
|
if (SWAB16(fat[k]) == 0x0000) {
|
|
unsigned int c = nr * CLUSTERS_PER_FAT16_SECTOR + k;
|
|
/* Ignore the reserved clusters 0 & 1, and also
|
|
cluster numbers out of bounds */
|
|
if ( c < 2 || c > fat_bpb->dataclusters+1 )
|
|
continue;
|
|
LDEBUGF("find_free_cluster(%x) == %x\n",startcluster,c);
|
|
fat_bpb->fsinfo.nextfree = c;
|
|
return c;
|
|
}
|
|
}
|
|
offset = 0;
|
|
}
|
|
}
|
|
else
|
|
#endif /* #ifdef HAVE_FAT16SUPPORT */
|
|
{
|
|
sector = startcluster / CLUSTERS_PER_FAT_SECTOR;
|
|
offset = startcluster % CLUSTERS_PER_FAT_SECTOR;
|
|
|
|
for (i = 0; i<fat_bpb->fatsize; i++) {
|
|
unsigned int j;
|
|
unsigned long nr = (i + sector) % fat_bpb->fatsize;
|
|
unsigned long* fat = cache_fat_sector(IF_MV2(fat_bpb,) nr, false);
|
|
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 long c = nr * CLUSTERS_PER_FAT_SECTOR + k;
|
|
/* Ignore the reserved clusters 0 & 1, and also
|
|
cluster numbers out of bounds */
|
|
if ( c < 2 || c > fat_bpb->dataclusters+1 )
|
|
continue;
|
|
LDEBUGF("find_free_cluster(%lx) == %lx\n",startcluster,c);
|
|
fat_bpb->fsinfo.nextfree = c;
|
|
return c;
|
|
}
|
|
}
|
|
offset = 0;
|
|
}
|
|
}
|
|
|
|
LDEBUGF("find_free_cluster(%lx) == 0\n",startcluster);
|
|
return 0; /* 0 is an illegal cluster number */
|
|
}
|
|
|
|
static int update_fat_entry(IF_MV2(struct bpb* fat_bpb,)
|
|
unsigned long entry,
|
|
unsigned long val)
|
|
{
|
|
#ifndef HAVE_MULTIVOLUME
|
|
struct bpb* fat_bpb = &fat_bpbs[0];
|
|
#endif
|
|
#ifdef HAVE_FAT16SUPPORT
|
|
if (fat_bpb->is_fat16)
|
|
{
|
|
int sector = entry / CLUSTERS_PER_FAT16_SECTOR;
|
|
int offset = entry % CLUSTERS_PER_FAT16_SECTOR;
|
|
unsigned short* sec;
|
|
|
|
val &= 0xFFFF;
|
|
|
|
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(IF_MV2(fat_bpb,) sector, true);
|
|
if (!sec)
|
|
{
|
|
DEBUGF( "update_fat_entry() - Could not cache sector %d\n", sector);
|
|
return -1;
|
|
}
|
|
|
|
if ( val ) {
|
|
if (SWAB16(sec[offset]) == 0x0000 && fat_bpb->fsinfo.freecount > 0)
|
|
fat_bpb->fsinfo.freecount--;
|
|
}
|
|
else {
|
|
if (SWAB16(sec[offset]))
|
|
fat_bpb->fsinfo.freecount++;
|
|
}
|
|
|
|
LDEBUGF("update_fat_entry: %d free clusters\n", fat_bpb->fsinfo.freecount);
|
|
|
|
sec[offset] = SWAB16(val);
|
|
}
|
|
else
|
|
#endif /* #ifdef HAVE_FAT16SUPPORT */
|
|
{
|
|
long sector = entry / CLUSTERS_PER_FAT_SECTOR;
|
|
int offset = entry % CLUSTERS_PER_FAT_SECTOR;
|
|
long unsigned int* sec;
|
|
|
|
LDEBUGF("update_fat_entry(%lx,%lx)\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(IF_MV2(fat_bpb,) sector, true);
|
|
if (!sec)
|
|
{
|
|
DEBUGF( "update_fat_entry() - Could not cache sector %ld\n", sector);
|
|
return -1;
|
|
}
|
|
|
|
if ( val ) {
|
|
if (!(SWAB32(sec[offset]) & 0x0fffffff) &&
|
|
fat_bpb->fsinfo.freecount > 0)
|
|
fat_bpb->fsinfo.freecount--;
|
|
}
|
|
else {
|
|
if (SWAB32(sec[offset]) & 0x0fffffff)
|
|
fat_bpb->fsinfo.freecount++;
|
|
}
|
|
|
|
LDEBUGF("update_fat_entry: %ld 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 long read_fat_entry(IF_MV2(struct bpb* fat_bpb,) unsigned long entry)
|
|
{
|
|
#ifdef HAVE_FAT16SUPPORT
|
|
#ifndef HAVE_MULTIVOLUME
|
|
struct bpb* fat_bpb = &fat_bpbs[0];
|
|
#endif
|
|
if (fat_bpb->is_fat16)
|
|
{
|
|
int sector = entry / CLUSTERS_PER_FAT16_SECTOR;
|
|
int offset = entry % CLUSTERS_PER_FAT16_SECTOR;
|
|
unsigned short* sec;
|
|
|
|
sec = cache_fat_sector(IF_MV2(fat_bpb,) sector, false);
|
|
if (!sec)
|
|
{
|
|
DEBUGF( "read_fat_entry() - Could not cache sector %d\n", sector);
|
|
return -1;
|
|
}
|
|
|
|
return SWAB16(sec[offset]);
|
|
}
|
|
else
|
|
#endif /* #ifdef HAVE_FAT16SUPPORT */
|
|
{
|
|
long sector = entry / CLUSTERS_PER_FAT_SECTOR;
|
|
int offset = entry % CLUSTERS_PER_FAT_SECTOR;
|
|
unsigned long* sec;
|
|
|
|
sec = cache_fat_sector(IF_MV2(fat_bpb,) sector, false);
|
|
if (!sec)
|
|
{
|
|
DEBUGF( "read_fat_entry() - Could not cache sector %ld\n", sector);
|
|
return -1;
|
|
}
|
|
|
|
return SWAB32(sec[offset]) & 0x0fffffff;
|
|
}
|
|
}
|
|
|
|
static long get_next_cluster(IF_MV2(struct bpb* fat_bpb,) long cluster)
|
|
{
|
|
long next_cluster;
|
|
long eof_mark = FAT_EOF_MARK;
|
|
|
|
#ifdef HAVE_FAT16SUPPORT
|
|
#ifndef HAVE_MULTIVOLUME
|
|
struct bpb* fat_bpb = &fat_bpbs[0];
|
|
#endif
|
|
if (fat_bpb->is_fat16)
|
|
{
|
|
eof_mark &= 0xFFFF; /* only 16 bit */
|
|
if (cluster < 0) /* FAT16 root dir */
|
|
return cluster + 1; /* don't use the FAT */
|
|
}
|
|
#endif
|
|
next_cluster = read_fat_entry(IF_MV2(fat_bpb,) cluster);
|
|
|
|
/* is this last cluster in chain? */
|
|
if ( next_cluster >= eof_mark )
|
|
return 0;
|
|
else
|
|
return next_cluster;
|
|
}
|
|
|
|
static int update_fsinfo(IF_MV_NONVOID(struct bpb* fat_bpb))
|
|
{
|
|
#ifndef HAVE_MULTIVOLUME
|
|
struct bpb* fat_bpb = &fat_bpbs[0];
|
|
#endif
|
|
unsigned char fsinfo[SECTOR_SIZE];
|
|
unsigned int* intptr;
|
|
int rc;
|
|
|
|
#ifdef HAVE_FAT16SUPPORT
|
|
if (fat_bpb->is_fat16)
|
|
return 0; /* FAT16 has no FsInfo */
|
|
#endif /* #ifdef HAVE_FAT16SUPPORT */
|
|
|
|
/* update fsinfo */
|
|
rc = ata_read_sectors(IF_MV2(fat_bpb->drive,)
|
|
fat_bpb->startsector + fat_bpb->bpb_fsinfo, 1,fsinfo);
|
|
if (rc < 0)
|
|
{
|
|
DEBUGF( "flush_fat() - Couldn't read FSInfo (error code %d)\n", rc);
|
|
return rc * 10 - 1;
|
|
}
|
|
intptr = (int*)&(fsinfo[FSINFO_FREECOUNT]);
|
|
*intptr = SWAB32(fat_bpb->fsinfo.freecount);
|
|
|
|
intptr = (int*)&(fsinfo[FSINFO_NEXTFREE]);
|
|
*intptr = SWAB32(fat_bpb->fsinfo.nextfree);
|
|
|
|
rc = ata_write_sectors(IF_MV2(fat_bpb->drive,)
|
|
fat_bpb->startsector + fat_bpb->bpb_fsinfo,1,fsinfo);
|
|
if (rc < 0)
|
|
{
|
|
DEBUGF( "flush_fat() - Couldn't write FSInfo (error code %d)\n", rc);
|
|
return rc * 10 - 2;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int flush_fat(IF_MV_NONVOID(struct bpb* fat_bpb))
|
|
{
|
|
int i;
|
|
int rc;
|
|
unsigned char *sec;
|
|
LDEBUGF("flush_fat()\n");
|
|
|
|
mutex_lock(&cache_mutex);
|
|
for(i = 0;i < FAT_CACHE_SIZE;i++)
|
|
{
|
|
struct fat_cache_entry *fce = &fat_cache[i];
|
|
if(fce->inuse
|
|
#ifdef HAVE_MULTIVOLUME
|
|
&& fce->fat_vol == fat_bpb
|
|
#endif
|
|
&& fce->dirty)
|
|
{
|
|
sec = fat_cache_sectors[i];
|
|
flush_fat_sector(fce, sec);
|
|
}
|
|
}
|
|
mutex_unlock(&cache_mutex);
|
|
|
|
rc = update_fsinfo(IF_MV(fat_bpb));
|
|
if (rc < 0)
|
|
return rc * 10 - 3;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void fat_time(unsigned short* date,
|
|
unsigned short* time,
|
|
unsigned short* tenth )
|
|
{
|
|
#ifdef HAVE_RTC
|
|
struct tm* tm = get_time();
|
|
|
|
if (date)
|
|
*date = ((tm->tm_year - 80) << 9) |
|
|
((tm->tm_mon + 1) << 5) |
|
|
tm->tm_mday;
|
|
|
|
if (time)
|
|
*time = (tm->tm_hour << 11) |
|
|
(tm->tm_min << 5) |
|
|
(tm->tm_sec >> 1);
|
|
|
|
if (tenth)
|
|
*tenth = (tm->tm_sec & 1) * 100;
|
|
#else
|
|
/* non-RTC version returns an increment from the supplied time, or a
|
|
* fixed standard time/date if no time given as input */
|
|
bool next_day = false;
|
|
|
|
if (time)
|
|
{
|
|
if (0 == *time)
|
|
{
|
|
/* set to 00:15:00 */
|
|
*time = (15 << 5);
|
|
}
|
|
else
|
|
{
|
|
unsigned short mins = (*time >> 5) & 0x003F;
|
|
unsigned short hours = (*time >> 11) & 0x001F;
|
|
if ((mins += 10) >= 60)
|
|
{
|
|
mins = 0;
|
|
hours++;
|
|
}
|
|
if ((++hours) >= 24)
|
|
{
|
|
hours = hours - 24;
|
|
next_day = true;
|
|
}
|
|
*time = (hours << 11) | (mins << 5);
|
|
}
|
|
}
|
|
|
|
if (date)
|
|
{
|
|
if (0 == *date)
|
|
{
|
|
/* set to 1 August 2003 */
|
|
*date = ((2003 - 1980) << 9) | (8 << 5) | 1;
|
|
}
|
|
else
|
|
{
|
|
unsigned short day = *date & 0x001F;
|
|
unsigned short month = (*date >> 5) & 0x000F;
|
|
unsigned short year = (*date >> 9) & 0x007F;
|
|
if (next_day)
|
|
{
|
|
/* do a very simple day increment - never go above 28 days */
|
|
if (++day > 28)
|
|
{
|
|
day = 1;
|
|
if (++month > 12)
|
|
{
|
|
month = 1;
|
|
year++;
|
|
}
|
|
}
|
|
*date = (year << 9) | (month << 5) | day;
|
|
}
|
|
}
|
|
}
|
|
if (tenth)
|
|
*tenth = 0;
|
|
#endif /* HAVE_RTC */
|
|
}
|
|
|
|
static int write_long_name(struct fat_file* file,
|
|
unsigned int firstentry,
|
|
unsigned int numentries,
|
|
const unsigned char* name,
|
|
const unsigned char* shortname,
|
|
bool is_directory)
|
|
{
|
|
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;
|
|
unsigned char chksum = 0;
|
|
int nameidx=0, namelen = strlen(name);
|
|
int rc;
|
|
|
|
LDEBUGF("write_long_name(file:%lx, first:%d, num:%d, name:%s)\n",
|
|
file->firstcluster, firstentry, numentries, name);
|
|
|
|
rc = fat_seek(file, sector);
|
|
if (rc<0)
|
|
return rc * 10 - 1;
|
|
|
|
rc = fat_readwrite(file, 1, buf, false);
|
|
if (rc<1)
|
|
return rc * 10 - 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 */
|
|
if ( namelen > NAME_BYTES_PER_ENTRY )
|
|
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 rc * 10 - 3;
|
|
|
|
rc = fat_readwrite(file, 1, buf, true);
|
|
if (rc<1)
|
|
return rc * 10 - 4;
|
|
|
|
/* read next sector */
|
|
rc = fat_readwrite(file, 1, buf, false);
|
|
if (rc<0) {
|
|
LDEBUGF("Failed writing new sector: %d\n",rc);
|
|
return rc * 10 - 5;
|
|
}
|
|
if (rc==0)
|
|
/* end of dir */
|
|
memset(buf, 0, sizeof buf);
|
|
|
|
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) {
|
|
/* mark this as last long entry */
|
|
entry[FATLONG_ORDER] |= 0x40;
|
|
|
|
/* pad name with 0xffff */
|
|
for (k=1; k<12; k++) entry[k] = 0xff;
|
|
for (k=14; k<26; k++) entry[k] = 0xff;
|
|
for (k=28; k<32; k++) entry[k] = 0xff;
|
|
};
|
|
/* set name */
|
|
for (k=0; k<5 && l <= namelen; k++) {
|
|
entry[k*2 + 1] = name[l++];
|
|
entry[k*2 + 2] = 0;
|
|
}
|
|
for (k=0; k<6 && l <= namelen; k++) {
|
|
entry[k*2 + 14] = name[l++];
|
|
entry[k*2 + 15] = 0;
|
|
}
|
|
for (k=0; k<2 && l <= namelen; k++) {
|
|
entry[k*2 + 28] = name[l++];
|
|
entry[k*2 + 29] = 0;
|
|
}
|
|
|
|
entry[FATDIR_ATTR] = FAT_ATTR_LONG_NAME;
|
|
entry[FATDIR_FSTCLUSLO] = 0;
|
|
entry[FATLONG_TYPE] = 0;
|
|
entry[FATLONG_CHKSUM] = chksum;
|
|
LDEBUGF("Longname entry %d: %s\n", idx, name+nameidx);
|
|
}
|
|
else {
|
|
/* shortname entry */
|
|
unsigned short date=0, time=0, tenth=0;
|
|
LDEBUGF("Shortname entry: %s\n", shortname);
|
|
strncpy(entry + FATDIR_NAME, shortname, 11);
|
|
entry[FATDIR_ATTR] = is_directory?FAT_ATTR_DIRECTORY:0;
|
|
entry[FATDIR_NTRES] = 0;
|
|
|
|
fat_time(&date, &time, &tenth);
|
|
entry[FATDIR_CRTTIMETENTH] = tenth;
|
|
*(unsigned short*)(entry + FATDIR_CRTTIME) = SWAB16(time);
|
|
*(unsigned short*)(entry + FATDIR_WRTTIME) = SWAB16(time);
|
|
*(unsigned short*)(entry + FATDIR_CRTDATE) = SWAB16(date);
|
|
*(unsigned short*)(entry + FATDIR_WRTDATE) = SWAB16(date);
|
|
*(unsigned short*)(entry + FATDIR_LSTACCDATE) = SWAB16(date);
|
|
}
|
|
idx++;
|
|
nameidx -= NAME_BYTES_PER_ENTRY;
|
|
}
|
|
|
|
/* update last sector */
|
|
rc = fat_seek(file, sector);
|
|
if (rc<0)
|
|
return rc * 10 - 6;
|
|
|
|
rc = fat_readwrite(file, 1, buf, true);
|
|
if (rc<1)
|
|
return rc * 10 - 7;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int add_dir_entry(struct fat_dir* dir,
|
|
struct fat_file* file,
|
|
const char* name,
|
|
bool is_directory,
|
|
bool dotdir)
|
|
{
|
|
#ifdef HAVE_MULTIVOLUME
|
|
struct bpb* fat_bpb = &fat_bpbs[dir->file.volume];
|
|
#else
|
|
struct bpb* fat_bpb = &fat_bpbs[0];
|
|
#endif
|
|
unsigned char buf[SECTOR_SIZE];
|
|
unsigned char shortname[16];
|
|
int rc;
|
|
unsigned int sector;
|
|
bool done = false;
|
|
bool eof = false;
|
|
bool last = false;
|
|
int entries_needed, entries_found = 0;
|
|
int namelen = strlen(name);
|
|
int firstentry;
|
|
|
|
LDEBUGF( "add_dir_entry(%s,%lx)\n",
|
|
name, file->firstcluster);
|
|
|
|
#ifdef HAVE_MULTIVOLUME
|
|
file->volume = dir->file.volume; /* inherit the volume, to make sure */
|
|
#endif
|
|
|
|
/* The "." and ".." directory entries must not be long names */
|
|
if(dotdir) {
|
|
int i;
|
|
strncpy(shortname, name, 16);
|
|
for(i = strlen(shortname);i < 12;i++)
|
|
shortname[i] = ' ';
|
|
|
|
entries_needed = 1;
|
|
} else {
|
|
/* create dos name */
|
|
rc = create_dos_name(name, shortname);
|
|
if (rc < 0)
|
|
return rc * 10 - 0;
|
|
|
|
/* 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++;
|
|
}
|
|
|
|
restart:
|
|
firstentry = 0;
|
|
|
|
rc = fat_seek(&dir->file, 0);
|
|
if (rc < 0)
|
|
return rc * 10 - 1;
|
|
|
|
for (sector=0; !done; sector++)
|
|
{
|
|
unsigned int i;
|
|
|
|
rc = 0;
|
|
if (!eof) {
|
|
rc = fat_readwrite(&dir->file, 1, buf, false);
|
|
}
|
|
if (rc == 0) {
|
|
/* eof: add new sector */
|
|
eof = true;
|
|
|
|
memset(buf, 0, sizeof buf);
|
|
LDEBUGF("Adding new sector to dir\n");
|
|
rc = fat_seek(&dir->file, sector);
|
|
if (rc < 0)
|
|
return rc * 10 - 2;
|
|
|
|
/* add sectors (we must clear the whole cluster) */
|
|
do {
|
|
rc = fat_readwrite(&dir->file, 1, buf, true);
|
|
if (rc < 1)
|
|
return rc * 10 - 3;
|
|
} while (dir->file.sectornum < (int)fat_bpb->bpb_secperclus);
|
|
}
|
|
if (rc < 0) {
|
|
DEBUGF( "add_dir_entry() - Couldn't read dir"
|
|
" (error code %d)\n", rc);
|
|
return rc * 10 - 4;
|
|
}
|
|
|
|
/* look for free slots */
|
|
for (i=0; i < DIR_ENTRIES_PER_SECTOR && !done; 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);
|
|
done = true;
|
|
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;
|
|
|
|
/* check that our intended shortname doesn't already exist */
|
|
if (!strncmp(shortname, buf + i * DIR_ENTRY_SIZE, 12)) {
|
|
/* filename exists already. make a new one */
|
|
snprintf(shortname+8, 4, "%03X", (unsigned)rand() & 0xfff);
|
|
LDEBUGF("Duplicate shortname, changing to %s\n",
|
|
shortname);
|
|
|
|
/* name has changed, we need to restart search */
|
|
goto restart;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (!firstentry && (entries_found == entries_needed)) {
|
|
firstentry = sector * DIR_ENTRIES_PER_SECTOR + i;
|
|
|
|
/* if we're not extending the dir,
|
|
we must go back to first free entry */
|
|
if (done)
|
|
last = true;
|
|
else
|
|
firstentry -= (entries_needed - 1);
|
|
}
|
|
}
|
|
}
|
|
|
|
sector = firstentry / DIR_ENTRIES_PER_SECTOR;
|
|
LDEBUGF("Adding longname to entry %d in sector %d\n",
|
|
firstentry, sector);
|
|
|
|
rc = write_long_name(&dir->file, firstentry,
|
|
entries_needed, name, shortname, is_directory);
|
|
if (rc < 0)
|
|
return rc * 10 - 5;
|
|
|
|
/* remember where the shortname dir entry is located */
|
|
file->direntry = firstentry + entries_needed - 1;
|
|
file->direntries = entries_needed;
|
|
file->dircluster = dir->file.firstcluster;
|
|
LDEBUGF("Added new dir entry %d, using %d slots.\n",
|
|
file->direntry, file->direntries);
|
|
|
|
/* advance the end-of-dir marker? */
|
|
if (last)
|
|
{
|
|
unsigned int lastentry = firstentry + entries_needed;
|
|
|
|
LDEBUGF("Updating end-of-dir entry %d\n",lastentry);
|
|
|
|
if (lastentry % DIR_ENTRIES_PER_SECTOR)
|
|
{
|
|
int idx = (lastentry % DIR_ENTRIES_PER_SECTOR) * DIR_ENTRY_SIZE;
|
|
|
|
rc = fat_seek(&dir->file, lastentry / DIR_ENTRIES_PER_SECTOR);
|
|
if (rc < 0)
|
|
return rc * 10 - 6;
|
|
|
|
rc = fat_readwrite(&dir->file, 1, buf, false);
|
|
if (rc < 1)
|
|
return rc * 10 - 7;
|
|
|
|
/* clear last entry */
|
|
buf[idx] = 0;
|
|
|
|
rc = fat_seek(&dir->file, lastentry / DIR_ENTRIES_PER_SECTOR);
|
|
if (rc < 0)
|
|
return rc * 10 - 8;
|
|
|
|
/* we must clear entire last cluster */
|
|
do {
|
|
rc = fat_readwrite(&dir->file, 1, buf, true);
|
|
if (rc < 1)
|
|
return rc * 10 - 9;
|
|
memset(buf, 0, sizeof buf);
|
|
} while (dir->file.sectornum < (int)fat_bpb->bpb_secperclus);
|
|
}
|
|
else
|
|
{
|
|
/* add a new sector/cluster for last entry */
|
|
memset(buf, 0, sizeof buf);
|
|
do {
|
|
rc = fat_readwrite(&dir->file, 1, buf, true);
|
|
if (rc < 1)
|
|
return rc * 10 - 9; /* Same error code as above, can't be
|
|
more than -9 */
|
|
} while (dir->file.sectornum < (int)fat_bpb->bpb_secperclus);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
unsigned char char2dos(unsigned char c)
|
|
{
|
|
switch(c)
|
|
{
|
|
case 0xe5: /* Special kanji character */
|
|
c = 0x05;
|
|
break;
|
|
case 0x20:
|
|
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(const unsigned char *name, unsigned char *newname)
|
|
{
|
|
int i,j;
|
|
|
|
/* Name part */
|
|
for (i=0, j=0; name[i] && (j < 8); i++)
|
|
{
|
|
unsigned char c = char2dos(name[i]);
|
|
if (c)
|
|
newname[j++] = toupper(c);
|
|
}
|
|
while (j < 8)
|
|
newname[j++] = ' ';
|
|
|
|
/* Extension part */
|
|
snprintf(newname+8, 4, "%03X", (unsigned)rand() & 0xfff);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int update_short_entry( struct fat_file* file, long size, int attr )
|
|
{
|
|
unsigned char buf[SECTOR_SIZE];
|
|
int sector = file->direntry / DIR_ENTRIES_PER_SECTOR;
|
|
unsigned char* entry =
|
|
buf + DIR_ENTRY_SIZE * (file->direntry % DIR_ENTRIES_PER_SECTOR);
|
|
unsigned long* sizeptr;
|
|
unsigned short* clusptr;
|
|
struct fat_file dir;
|
|
int rc;
|
|
|
|
LDEBUGF("update_file_size(cluster:%lx entry:%d size:%ld)\n",
|
|
file->firstcluster, file->direntry, size);
|
|
|
|
/* create a temporary file handle for the dir holding this file */
|
|
rc = fat_open(IF_MV2(file->volume,) file->dircluster, &dir, NULL);
|
|
if (rc < 0)
|
|
return rc * 10 - 1;
|
|
|
|
rc = fat_seek( &dir, sector );
|
|
if (rc<0)
|
|
return rc * 10 - 2;
|
|
|
|
rc = fat_readwrite(&dir, 1, buf, false);
|
|
if (rc < 1)
|
|
return rc * 10 - 3;
|
|
|
|
if (!entry[0] || entry[0] == 0xe5)
|
|
panicf("Updating size on empty dir entry %d\n", file->direntry);
|
|
|
|
entry[FATDIR_ATTR] = attr & 0xFF;
|
|
|
|
clusptr = (short*)(entry + FATDIR_FSTCLUSHI);
|
|
*clusptr = SWAB16(file->firstcluster >> 16);
|
|
|
|
clusptr = (short*)(entry + FATDIR_FSTCLUSLO);
|
|
*clusptr = SWAB16(file->firstcluster & 0xffff);
|
|
|
|
sizeptr = (long*)(entry + FATDIR_FILESIZE);
|
|
*sizeptr = SWAB32(size);
|
|
|
|
{
|
|
#ifdef HAVE_RTC
|
|
unsigned short time = 0;
|
|
unsigned short date = 0;
|
|
#else
|
|
/* get old time to increment from */
|
|
unsigned short time = SWAB16(*(unsigned short*)(entry + FATDIR_WRTTIME));
|
|
unsigned short date = SWAB16(*(unsigned short*)(entry + FATDIR_WRTDATE));
|
|
#endif
|
|
fat_time(&date, &time, NULL);
|
|
*(unsigned short*)(entry + FATDIR_WRTTIME) = SWAB16(time);
|
|
*(unsigned short*)(entry + FATDIR_WRTDATE) = SWAB16(date);
|
|
*(unsigned short*)(entry + FATDIR_LSTACCDATE) = SWAB16(date);
|
|
}
|
|
|
|
rc = fat_seek( &dir, sector );
|
|
if (rc < 0)
|
|
return rc * 10 - 4;
|
|
|
|
rc = fat_readwrite(&dir, 1, buf, true);
|
|
if (rc < 1)
|
|
return rc * 10 - 5;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int parse_direntry(struct fat_direntry *de, const 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 = ((long)BYTES2INT16(buf,FATDIR_FSTCLUSLO)) |
|
|
((long)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(IF_MV2(int volume,)
|
|
long startcluster,
|
|
struct fat_file *file,
|
|
const struct fat_dir* dir)
|
|
{
|
|
file->firstcluster = startcluster;
|
|
file->lastcluster = startcluster;
|
|
file->lastsector = 0;
|
|
file->clusternum = 0;
|
|
file->sectornum = 0;
|
|
file->eof = false;
|
|
#ifdef HAVE_MULTIVOLUME
|
|
file->volume = volume;
|
|
/* fixme: remove error check when done */
|
|
if (volume >= NUM_VOLUMES || !fat_bpbs[volume].mounted)
|
|
{
|
|
LDEBUGF("fat_open() illegal volume %d\n", volume);
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
/* remember where the file's dir entry is located */
|
|
if ( dir ) {
|
|
file->direntry = dir->entry - 1;
|
|
file->direntries = dir->entrycount;
|
|
file->dircluster = dir->file.firstcluster;
|
|
}
|
|
LDEBUGF("fat_open(%lx), entry %d\n",startcluster,file->direntry);
|
|
return 0;
|
|
}
|
|
|
|
int fat_create_file(const char* name,
|
|
struct fat_file* file,
|
|
struct fat_dir* dir)
|
|
{
|
|
int rc;
|
|
|
|
LDEBUGF("fat_create_file(\"%s\",%lx,%lx)\n",name,(long)file,(long)dir);
|
|
rc = add_dir_entry(dir, file, name, false, false);
|
|
if (!rc) {
|
|
file->firstcluster = 0;
|
|
file->lastcluster = 0;
|
|
file->lastsector = 0;
|
|
file->clusternum = 0;
|
|
file->sectornum = 0;
|
|
file->eof = false;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
int fat_create_dir(const char* name,
|
|
struct fat_dir* newdir,
|
|
struct fat_dir* dir)
|
|
{
|
|
#ifdef HAVE_MULTIVOLUME
|
|
struct bpb* fat_bpb = &fat_bpbs[dir->file.volume];
|
|
#else
|
|
struct bpb* fat_bpb = &fat_bpbs[0];
|
|
#endif
|
|
unsigned char buf[SECTOR_SIZE];
|
|
int i;
|
|
int sector;
|
|
int rc;
|
|
struct fat_file dummyfile;
|
|
|
|
LDEBUGF("fat_create_dir(\"%s\",%lx,%lx)\n",name,(long)newdir,(long)dir);
|
|
|
|
memset(newdir, 0, sizeof(struct fat_dir));
|
|
memset(&dummyfile, 0, sizeof(struct fat_file));
|
|
|
|
/* First, add the entry in the parent directory */
|
|
rc = add_dir_entry(dir, &newdir->file, name, true, false);
|
|
if (rc < 0)
|
|
return rc * 10 - 1;
|
|
|
|
/* Allocate a new cluster for the directory */
|
|
newdir->file.firstcluster = find_free_cluster(IF_MV2(fat_bpb,) fat_bpb->fsinfo.nextfree);
|
|
if(newdir->file.firstcluster == 0)
|
|
return -1;
|
|
|
|
update_fat_entry(IF_MV2(fat_bpb,) newdir->file.firstcluster, FAT_EOF_MARK);
|
|
|
|
/* Clear the entire cluster */
|
|
memset(buf, 0, sizeof buf);
|
|
sector = cluster2sec(IF_MV2(fat_bpb,) newdir->file.firstcluster);
|
|
for(i = 0;i < (int)fat_bpb->bpb_secperclus;i++) {
|
|
rc = transfer(IF_MV2(fat_bpb,) sector + i, 1, buf, true );
|
|
if (rc < 0)
|
|
return rc * 10 - 2;
|
|
}
|
|
|
|
/* Then add the "." entry */
|
|
rc = add_dir_entry(newdir, &dummyfile, ".", true, true);
|
|
if (rc < 0)
|
|
return rc * 10 - 3;
|
|
dummyfile.firstcluster = newdir->file.firstcluster;
|
|
update_short_entry(&dummyfile, 0, FAT_ATTR_DIRECTORY);
|
|
|
|
/* and the ".." entry */
|
|
rc = add_dir_entry(newdir, &dummyfile, "..", true, true);
|
|
if (rc < 0)
|
|
return rc * 10 - 4;
|
|
|
|
/* The root cluster is cluster 0 in the ".." entry */
|
|
if(dir->file.firstcluster == fat_bpb->bpb_rootclus)
|
|
dummyfile.firstcluster = 0;
|
|
else
|
|
dummyfile.firstcluster = dir->file.firstcluster;
|
|
update_short_entry(&dummyfile, 0, FAT_ATTR_DIRECTORY);
|
|
|
|
/* Set the firstcluster field in the direntry */
|
|
update_short_entry(&newdir->file, 0, FAT_ATTR_DIRECTORY);
|
|
|
|
rc = flush_fat(IF_MV(fat_bpb));
|
|
if (rc < 0)
|
|
return rc * 10 - 5;
|
|
|
|
return rc;
|
|
}
|
|
|
|
int fat_truncate(const struct fat_file *file)
|
|
{
|
|
/* truncate trailing clusters */
|
|
long next;
|
|
long last = file->lastcluster;
|
|
#ifdef HAVE_MULTIVOLUME
|
|
struct bpb* fat_bpb = &fat_bpbs[file->volume];
|
|
#endif
|
|
|
|
LDEBUGF("fat_truncate(%lx, %lx)\n", file->firstcluster, last);
|
|
|
|
for ( last = get_next_cluster(IF_MV2(fat_bpb,) last); last; last = next ) {
|
|
next = get_next_cluster(IF_MV2(fat_bpb,) last);
|
|
update_fat_entry(IF_MV2(fat_bpb,) last,0);
|
|
}
|
|
if (file->lastcluster)
|
|
update_fat_entry(IF_MV2(fat_bpb,) file->lastcluster,FAT_EOF_MARK);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int fat_closewrite(struct fat_file *file, long size, int attr)
|
|
{
|
|
int rc;
|
|
#ifdef HAVE_MULTIVOLUME
|
|
struct bpb* fat_bpb = &fat_bpbs[file->volume];
|
|
#endif
|
|
LDEBUGF("fat_closewrite(size=%ld)\n",size);
|
|
|
|
if (!size) {
|
|
/* empty file */
|
|
if ( file->firstcluster ) {
|
|
update_fat_entry(IF_MV2(fat_bpb,) file->firstcluster, 0);
|
|
file->firstcluster = 0;
|
|
}
|
|
}
|
|
|
|
if (file->dircluster) {
|
|
rc = update_short_entry(file, size, attr);
|
|
if (rc < 0)
|
|
return rc * 10 - 1;
|
|
}
|
|
|
|
flush_fat(IF_MV(fat_bpb));
|
|
|
|
#ifdef TEST_FAT
|
|
if ( file->firstcluster ) {
|
|
/* debug */
|
|
#ifdef HAVE_MULTIVOLUME
|
|
struct bpb* fat_bpb = &fat_bpbs[file->volume];
|
|
#else
|
|
struct bpb* fat_bpb = &fat_bpbs[0];
|
|
#endif
|
|
long count = 0;
|
|
long len;
|
|
long next;
|
|
for ( next = file->firstcluster; next;
|
|
next = get_next_cluster(IF_MV2(fat_bpb,) next) )
|
|
LDEBUGF("cluster %ld: %lx\n", count++, next);
|
|
len = count * fat_bpb->bpb_secperclus * SECTOR_SIZE;
|
|
LDEBUGF("File is %ld clusters (chainlen=%ld, size=%ld)\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;
|
|
}
|
|
|
|
static int free_direntries(struct fat_file* file)
|
|
{
|
|
unsigned char buf[SECTOR_SIZE];
|
|
struct fat_file dir;
|
|
int numentries = file->direntries;
|
|
unsigned int entry = file->direntry - numentries + 1;
|
|
unsigned int sector = entry / DIR_ENTRIES_PER_SECTOR;
|
|
int i;
|
|
int rc;
|
|
|
|
/* create a temporary file handle for the dir holding this file */
|
|
rc = fat_open(IF_MV2(file->volume,) file->dircluster, &dir, NULL);
|
|
if (rc < 0)
|
|
return rc * 10 - 1;
|
|
|
|
rc = fat_seek( &dir, sector );
|
|
if (rc < 0)
|
|
return rc * 10 - 2;
|
|
|
|
rc = fat_readwrite(&dir, 1, buf, false);
|
|
if (rc < 1)
|
|
return rc * 10 - 3;
|
|
|
|
for (i=0; i < numentries; i++) {
|
|
LDEBUGF("Clearing dir entry %d (%d/%d)\n",
|
|
entry, i+1, numentries);
|
|
buf[(entry % DIR_ENTRIES_PER_SECTOR) * DIR_ENTRY_SIZE] = 0xe5;
|
|
entry++;
|
|
|
|
if ( (entry % DIR_ENTRIES_PER_SECTOR) == 0 ) {
|
|
/* flush this sector */
|
|
rc = fat_seek(&dir, sector);
|
|
if (rc < 0)
|
|
return rc * 10 - 4;
|
|
|
|
rc = fat_readwrite(&dir, 1, buf, true);
|
|
if (rc < 1)
|
|
return rc * 10 - 5;
|
|
|
|
if ( i+1 < numentries ) {
|
|
/* read next sector */
|
|
rc = fat_readwrite(&dir, 1, buf, false);
|
|
if (rc < 1)
|
|
return rc * 10 - 6;
|
|
}
|
|
sector++;
|
|
}
|
|
}
|
|
|
|
if ( entry % DIR_ENTRIES_PER_SECTOR ) {
|
|
/* flush this sector */
|
|
rc = fat_seek(&dir, sector);
|
|
if (rc < 0)
|
|
return rc * 10 - 7;
|
|
|
|
rc = fat_readwrite(&dir, 1, buf, true);
|
|
if (rc < 1)
|
|
return rc * 10 - 8;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int fat_remove(struct fat_file* file)
|
|
{
|
|
long next, last = file->firstcluster;
|
|
int rc;
|
|
#ifdef HAVE_MULTIVOLUME
|
|
struct bpb* fat_bpb = &fat_bpbs[file->volume];
|
|
#endif
|
|
|
|
LDEBUGF("fat_remove(%lx)\n",last);
|
|
|
|
while ( last ) {
|
|
next = get_next_cluster(IF_MV2(fat_bpb,) last);
|
|
update_fat_entry(IF_MV2(fat_bpb,) last,0);
|
|
last = next;
|
|
}
|
|
|
|
if ( file->dircluster ) {
|
|
rc = free_direntries(file);
|
|
if (rc < 0)
|
|
return rc * 10 - 1;
|
|
}
|
|
|
|
file->firstcluster = 0;
|
|
file->dircluster = 0;
|
|
|
|
rc = flush_fat(IF_MV(fat_bpb));
|
|
if (rc < 0)
|
|
return rc * 10 - 2;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int fat_rename(struct fat_file* file,
|
|
struct fat_dir* dir,
|
|
const unsigned char* newname,
|
|
long size,
|
|
int attr)
|
|
{
|
|
int rc;
|
|
struct fat_dir olddir;
|
|
struct fat_file newfile = *file;
|
|
#ifdef HAVE_MULTIVOLUME
|
|
struct bpb* fat_bpb = &fat_bpbs[file->volume];
|
|
|
|
if (file->volume != dir->file.volume) {
|
|
DEBUGF("No rename across volumes!\n");
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
if ( !file->dircluster ) {
|
|
DEBUGF("File has no dir cluster!\n");
|
|
return -2;
|
|
}
|
|
|
|
/* create a temporary file handle */
|
|
rc = fat_opendir(IF_MV2(file->volume,) &olddir, file->dircluster, NULL);
|
|
if (rc < 0)
|
|
return rc * 10 - 3;
|
|
|
|
/* create new name */
|
|
rc = add_dir_entry(dir, &newfile, newname, false, false);
|
|
if (rc < 0)
|
|
return rc * 10 - 4;
|
|
|
|
/* write size and cluster link */
|
|
rc = update_short_entry(&newfile, size, attr);
|
|
if (rc < 0)
|
|
return rc * 10 - 5;
|
|
|
|
/* remove old name */
|
|
rc = free_direntries(file);
|
|
if (rc < 0)
|
|
return rc * 10 - 6;
|
|
|
|
rc = flush_fat(IF_MV(fat_bpb));
|
|
if (rc < 0)
|
|
return rc * 10 - 7;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int next_write_cluster(struct fat_file* file,
|
|
long oldcluster,
|
|
long* newsector)
|
|
{
|
|
#ifdef HAVE_MULTIVOLUME
|
|
struct bpb* fat_bpb = &fat_bpbs[file->volume];
|
|
#else
|
|
struct bpb* fat_bpb = &fat_bpbs[0];
|
|
#endif
|
|
long cluster = 0;
|
|
long sector;
|
|
|
|
LDEBUGF("next_write_cluster(%lx,%lx)\n",file->firstcluster, oldcluster);
|
|
|
|
if (oldcluster)
|
|
cluster = get_next_cluster(IF_MV2(fat_bpb,) oldcluster);
|
|
|
|
if (!cluster) {
|
|
if (oldcluster > 0)
|
|
cluster = find_free_cluster(IF_MV2(fat_bpb,) oldcluster+1);
|
|
else if (oldcluster == 0)
|
|
cluster = find_free_cluster(IF_MV2(fat_bpb,) fat_bpb->fsinfo.nextfree);
|
|
#ifdef HAVE_FAT16SUPPORT
|
|
else /* negative, pseudo-cluster of the root dir */
|
|
return 0; /* impossible to append something to the root */
|
|
#endif
|
|
|
|
if (cluster) {
|
|
if (oldcluster)
|
|
update_fat_entry(IF_MV2(fat_bpb,) oldcluster, cluster);
|
|
else
|
|
file->firstcluster = cluster;
|
|
update_fat_entry(IF_MV2(fat_bpb,) 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(IF_MV2(fat_bpb,) cluster);
|
|
if (sector<0)
|
|
return 0;
|
|
|
|
*newsector = sector;
|
|
return cluster;
|
|
}
|
|
|
|
static int transfer(IF_MV2(struct bpb* fat_bpb,)
|
|
unsigned long start, long count, char* buf, bool write )
|
|
{
|
|
#ifndef HAVE_MULTIVOLUME
|
|
struct bpb* fat_bpb = &fat_bpbs[0];
|
|
#endif
|
|
int rc;
|
|
|
|
LDEBUGF("transfer(s=%lx, c=%lx, %s)\n",
|
|
start+ fat_bpb->startsector, count, write?"write":"read");
|
|
if (write) {
|
|
unsigned long firstallowed;
|
|
#ifdef HAVE_FAT16SUPPORT
|
|
if (fat_bpb->is_fat16)
|
|
firstallowed = fat_bpb->rootdirsector;
|
|
else
|
|
#endif
|
|
firstallowed = fat_bpb->firstdatasector;
|
|
|
|
if (start < firstallowed)
|
|
panicf("Write %d before data\n", firstallowed - start);
|
|
if (start + count > fat_bpb->totalsectors)
|
|
panicf("Write %d after data\n",
|
|
start + count - fat_bpb->totalsectors);
|
|
rc = ata_write_sectors(IF_MV2(fat_bpb->drive,)
|
|
start + fat_bpb->startsector, count, buf);
|
|
}
|
|
else
|
|
rc = ata_read_sectors(IF_MV2(fat_bpb->drive,)
|
|
start + fat_bpb->startsector, count, buf);
|
|
if (rc < 0) {
|
|
DEBUGF( "transfer() - Couldn't %s sector %lx"
|
|
" (error code %d)\n",
|
|
write ? "write":"read", start, rc);
|
|
return rc;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
int fat_readwrite( struct fat_file *file, long sectorcount,
|
|
void* buf, bool write )
|
|
{
|
|
#ifdef HAVE_MULTIVOLUME
|
|
struct bpb* fat_bpb = &fat_bpbs[file->volume];
|
|
#else
|
|
struct bpb* fat_bpb = &fat_bpbs[0];
|
|
#endif
|
|
long cluster = file->lastcluster;
|
|
long sector = file->lastsector;
|
|
long clusternum = file->clusternum;
|
|
long numsec = file->sectornum;
|
|
bool eof = file->eof;
|
|
long first=0, last=0;
|
|
long i;
|
|
int rc;
|
|
|
|
LDEBUGF( "fat_readwrite(file:%lx,count:0x%lx,buf:%lx,%s)\n",
|
|
file->firstcluster,sectorcount,(long)buf,write?"write":"read");
|
|
LDEBUGF( "fat_readwrite: sec=%lx numsec=%ld 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 > (long)fat_bpb->bpb_secperclus || !cluster ) {
|
|
long oldcluster = cluster;
|
|
if (write)
|
|
cluster = next_write_cluster(file, cluster, §or);
|
|
else {
|
|
cluster = get_next_cluster(IF_MV2(fat_bpb,) cluster);
|
|
sector = cluster2sec(IF_MV2(fat_bpb,) cluster);
|
|
}
|
|
|
|
clusternum++;
|
|
numsec=1;
|
|
|
|
if (!cluster) {
|
|
eof = true;
|
|
if ( write ) {
|
|
/* remember last cluster, in case
|
|
we want to append to the file */
|
|
cluster = oldcluster;
|
|
clusternum--;
|
|
i = -1; /* Error code */
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
eof = false;
|
|
}
|
|
else {
|
|
if (sector)
|
|
sector++;
|
|
else {
|
|
/* look up first sector of file */
|
|
sector = cluster2sec(IF_MV2(fat_bpb,) file->firstcluster);
|
|
numsec=1;
|
|
#ifdef HAVE_FAT16SUPPORT
|
|
if (file->firstcluster < 0)
|
|
{ /* FAT16 root dir */
|
|
sector += fat_bpb->rootdiroffset;
|
|
numsec += fat_bpb->rootdiroffset;
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
|
|
if (!first)
|
|
first = sector;
|
|
|
|
if ( ((sector != first) && (sector != last+1)) || /* not sequential */
|
|
(last-first+1 == 256) ) { /* max 256 sectors per ata request */
|
|
long count = last - first + 1;
|
|
rc = transfer(IF_MV2(fat_bpb,) first, count, buf, write );
|
|
if (rc < 0)
|
|
return rc * 10 - 1;
|
|
|
|
buf = (char *)buf + count * SECTOR_SIZE;
|
|
first = sector;
|
|
}
|
|
|
|
if ((i == sectorcount-1) && /* last sector requested */
|
|
(!eof))
|
|
{
|
|
long count = sector - first + 1;
|
|
rc = transfer(IF_MV2(fat_bpb,) first, count, buf, write );
|
|
if (rc < 0)
|
|
return rc * 10 - 2;
|
|
}
|
|
|
|
last = sector;
|
|
}
|
|
|
|
file->lastcluster = cluster;
|
|
file->lastsector = sector;
|
|
file->clusternum = clusternum;
|
|
file->sectornum = numsec;
|
|
file->eof = eof;
|
|
|
|
/* if eof, don't report last block as read/written */
|
|
if (eof)
|
|
i--;
|
|
|
|
DEBUGF("Sectors written: %ld\n", i);
|
|
return i;
|
|
}
|
|
|
|
int fat_seek(struct fat_file *file, unsigned long seeksector )
|
|
{
|
|
#ifdef HAVE_MULTIVOLUME
|
|
struct bpb* fat_bpb = &fat_bpbs[file->volume];
|
|
#else
|
|
struct bpb* fat_bpb = &fat_bpbs[0];
|
|
#endif
|
|
long clusternum=0, numclusters=0, sectornum=0, sector=0;
|
|
long cluster = file->firstcluster;
|
|
long i;
|
|
|
|
#ifdef HAVE_FAT16SUPPORT
|
|
if (cluster < 0) /* FAT16 root dir */
|
|
seeksector += fat_bpb->rootdiroffset;
|
|
#endif
|
|
|
|
file->eof = false;
|
|
if (seeksector) {
|
|
/* we need to find the sector BEFORE the requested, since
|
|
the file struct stores the last accessed sector */
|
|
seeksector--;
|
|
numclusters = clusternum = seeksector / fat_bpb->bpb_secperclus;
|
|
sectornum = seeksector % fat_bpb->bpb_secperclus;
|
|
|
|
if (file->clusternum && clusternum >= file->clusternum)
|
|
{
|
|
cluster = file->lastcluster;
|
|
numclusters -= file->clusternum;
|
|
}
|
|
|
|
for (i=0; i<numclusters; i++) {
|
|
cluster = get_next_cluster(IF_MV2(fat_bpb,) cluster);
|
|
if (!cluster) {
|
|
DEBUGF("Seeking beyond the end of the file! "
|
|
"(sector %ld, cluster %ld)\n", seeksector, i);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
sector = cluster2sec(IF_MV2(fat_bpb,) cluster) + sectornum;
|
|
}
|
|
else {
|
|
sectornum = -1;
|
|
}
|
|
|
|
LDEBUGF("fat_seek(%lx, %lx) == %lx, %lx, %lx\n",
|
|
file->firstcluster, seeksector, cluster, sector, sectornum);
|
|
|
|
file->lastcluster = cluster;
|
|
file->lastsector = sector;
|
|
file->clusternum = clusternum;
|
|
file->sectornum = sectornum + 1;
|
|
return 0;
|
|
}
|
|
|
|
int fat_opendir(IF_MV2(int volume,)
|
|
struct fat_dir *dir, unsigned long startcluster,
|
|
const struct fat_dir *parent_dir)
|
|
{
|
|
#ifdef HAVE_MULTIVOLUME
|
|
struct bpb* fat_bpb = &fat_bpbs[volume];
|
|
/* fixme: remove error check when done */
|
|
if (volume >= NUM_VOLUMES || !fat_bpbs[volume].mounted)
|
|
{
|
|
LDEBUGF("fat_open() illegal volume %d\n", volume);
|
|
return -1;
|
|
}
|
|
#else
|
|
struct bpb* fat_bpb = &fat_bpbs[0];
|
|
#endif
|
|
int rc;
|
|
|
|
dir->entry = 0;
|
|
dir->sector = 0;
|
|
|
|
if (startcluster == 0)
|
|
startcluster = fat_bpb->bpb_rootclus;
|
|
|
|
rc = fat_open(IF_MV2(volume,) startcluster, &dir->file, parent_dir);
|
|
if(rc)
|
|
{
|
|
DEBUGF( "fat_opendir() - Couldn't open dir"
|
|
" (error code %d)\n", rc);
|
|
return rc * 10 - 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* convert from unicode to a single-byte charset */
|
|
static void unicode2iso(const unsigned char* unicode, unsigned char* iso,
|
|
int count)
|
|
{
|
|
int i;
|
|
|
|
for (i=0; i<count; i++) {
|
|
int x = i*2;
|
|
switch (unicode[x+1]) {
|
|
case 0x01: /* latin extended. convert to ISO 8859-2 */
|
|
case 0x02:
|
|
iso[i] = unicode2iso8859_2[unicode[x]];
|
|
break;
|
|
|
|
case 0x03: /* greek, convert to ISO 8859-7 */
|
|
iso[i] = unicode[x] + 0x30;
|
|
break;
|
|
|
|
/* Sergei says most russians use Win1251, so we will too.
|
|
Win1251 differs from ISO 8859-5 by an offset of 0x10. */
|
|
case 0x04: /* cyrillic, convert to Win1251 */
|
|
switch (unicode[x]) {
|
|
case 1:
|
|
iso[i] = 168;
|
|
break;
|
|
|
|
case 81:
|
|
iso[i] = 184;
|
|
break;
|
|
|
|
default:
|
|
iso[i] = unicode[x] + 0xb0; /* 0xa0 for ISO 8859-5 */
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case 0x05: /* hebrew, convert to ISO 8859-8 */
|
|
iso[i] = unicode[x] + 0x10;
|
|
break;
|
|
|
|
case 0x06: /* arabic, convert to ISO 8859-6 */
|
|
case 0x0e: /* thai, convert to ISO 8859-11 */
|
|
iso[i] = unicode[x] + 0xa0;
|
|
break;
|
|
|
|
default:
|
|
iso[i] = unicode[x];
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
int fat_getnext(struct fat_dir *dir, struct fat_direntry *entry)
|
|
{
|
|
bool done = false;
|
|
int i;
|
|
int rc;
|
|
unsigned char firstbyte;
|
|
int longarray[20];
|
|
int longs=0;
|
|
int sectoridx=0;
|
|
unsigned char* cached_buf = dir->sectorcache[0];
|
|
|
|
dir->entrycount = 0;
|
|
|
|
while(!done)
|
|
{
|
|
if ( !(dir->entry % DIR_ENTRIES_PER_SECTOR) || !dir->sector )
|
|
{
|
|
rc = fat_readwrite(&dir->file, 1, cached_buf, false);
|
|
if (rc == 0) {
|
|
/* eof */
|
|
entry->name[0] = 0;
|
|
break;
|
|
}
|
|
if (rc < 0) {
|
|
DEBUGF( "fat_getnext() - Couldn't read dir"
|
|
" (error code %d)\n", rc);
|
|
return rc * 10 - 1;
|
|
}
|
|
dir->sector = dir->file.lastsector;
|
|
}
|
|
|
|
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;
|
|
dir->entrycount = 0;
|
|
continue;
|
|
}
|
|
|
|
if (firstbyte == 0) {
|
|
/* last entry */
|
|
entry->name[0] = 0;
|
|
dir->entrycount = 0;
|
|
return 0;
|
|
}
|
|
|
|
dir->entrycount++;
|
|
|
|
/* 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,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 = dir->sectorcache[1];
|
|
else
|
|
ptr = dir->sectorcache[2];
|
|
}
|
|
else {
|
|
if ( index < SECTOR_SIZE )
|
|
ptr = dir->sectorcache[1];
|
|
}
|
|
|
|
index &= SECTOR_SIZE-1;
|
|
}
|
|
|
|
/* names are stored in unicode, but we
|
|
only grab the low byte (iso8859-1). */
|
|
unicode2iso(ptr + index + 1, entry->name + l, 5);
|
|
l+= 5;
|
|
unicode2iso(ptr + index + 14, entry->name + l, 6);
|
|
l+= 6;
|
|
unicode2iso(ptr + index + 28, entry->name + l, 2);
|
|
l+= 2;
|
|
}
|
|
entry->name[l]=0;
|
|
}
|
|
done = true;
|
|
sectoridx = 0;
|
|
i++;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* save this sector, for longname use */
|
|
if ( sectoridx )
|
|
memcpy( dir->sectorcache[2], dir->sectorcache[0], SECTOR_SIZE );
|
|
else
|
|
memcpy( dir->sectorcache[1], dir->sectorcache[0], SECTOR_SIZE );
|
|
sectoridx += SECTOR_SIZE;
|
|
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int fat_get_cluster_size(IF_MV_NONVOID(int volume))
|
|
{
|
|
#ifndef HAVE_MULTIVOLUME
|
|
const int volume = 0;
|
|
#endif
|
|
struct bpb* fat_bpb = &fat_bpbs[volume];
|
|
return fat_bpb->bpb_secperclus * SECTOR_SIZE;
|
|
}
|
|
|
|
#ifdef HAVE_MULTIVOLUME
|
|
bool fat_ismounted(int volume)
|
|
{
|
|
return (volume<NUM_VOLUMES && fat_bpbs[volume].mounted);
|
|
}
|
|
#endif
|