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/**************************************************************************** __________ __ ___.* Open \______ \ ____ ____ | | _\_ |__ _______ ___* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \* \/ \/ \/ \/ \/* $Id: fat.c 25459 2010-04-03 22:02:09Z gevaerts $** Copyright (C) 2002 by Linus Nielsen Feltzing** This program is free software; you can redistribute it and/or* modify it under the terms of the GNU General Public License* as published by the Free Software Foundation; either version 2* of the License, or (at your option) any later version.** This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY* KIND, either express or implied.*****************************************************************************/#include "global.h"#include "thread.h"#include "libc/include/string.h"#include "libc/include/stdio.h"#include "fat.h"#include "storage.h"#include "debug.h"#include "panic.h"#include "libc/include/ctype.h"#define BYTES2INT16(array,pos) \(array[pos] | (array[pos+1] << 8 ))#define BYTES2INT32(array,pos) \((long)array[pos] | ((long)array[pos+1] << 8 ) | \((long)array[pos+2] << 16 ) | ((long)array[pos+3] << 24 ))#define FATTYPE_FAT12 0#define FATTYPE_FAT16 1#define FATTYPE_FAT32 2/* BPB offsets; generic */#define BS_JMPBOOT 0#define BS_OEMNAME 3#define BPB_BYTSPERSEC 11#define BPB_SECPERCLUS 13#define BPB_RSVDSECCNT 14#define BPB_NUMFATS 16#define BPB_ROOTENTCNT 17#define BPB_TOTSEC16 19#define BPB_MEDIA 21#define BPB_FATSZ16 22#define BPB_SECPERTRK 24#define BPB_NUMHEADS 26#define BPB_HIDDSEC 28#define BPB_TOTSEC32 32/* fat12/16 */#define BS_DRVNUM 36#define BS_RESERVED1 37#define BS_BOOTSIG 38#define BS_VOLID 39#define BS_VOLLAB 43#define BS_FILSYSTYPE 54/* fat32 */#define BPB_FATSZ32 36#define BPB_EXTFLAGS 40#define BPB_FSVER 42#define BPB_ROOTCLUS 44#define BPB_FSINFO 48#define BPB_BKBOOTSEC 50#define BS_32_DRVNUM 64#define BS_32_BOOTSIG 66#define BS_32_VOLID 67#define BS_32_VOLLAB 71#define BS_32_FILSYSTYPE 82#define BPB_LAST_WORD 510/* attributes */#define FAT_ATTR_LONG_NAME (FAT_ATTR_READ_ONLY | FAT_ATTR_HIDDEN | \FAT_ATTR_SYSTEM | FAT_ATTR_VOLUME_ID)#define FAT_ATTR_LONG_NAME_MASK (FAT_ATTR_READ_ONLY | FAT_ATTR_HIDDEN | \FAT_ATTR_SYSTEM | FAT_ATTR_VOLUME_ID | \FAT_ATTR_DIRECTORY | FAT_ATTR_ARCHIVE )/* NTRES flags */#define FAT_NTRES_LC_NAME 0x08#define FAT_NTRES_LC_EXT 0x10#define FATDIR_NAME 0#define FATDIR_ATTR 11#define FATDIR_NTRES 12#define FATDIR_CRTTIMETENTH 13#define FATDIR_CRTTIME 14#define FATDIR_CRTDATE 16#define FATDIR_LSTACCDATE 18#define FATDIR_FSTCLUSHI 20#define FATDIR_WRTTIME 22#define FATDIR_WRTDATE 24#define FATDIR_FSTCLUSLO 26#define FATDIR_FILESIZE 28#define FATLONG_ORDER 0#define FATLONG_TYPE 12#define FATLONG_CHKSUM 13#define FATLONG_LAST_LONG_ENTRY 0x40#define FATLONG_NAME_BYTES_PER_ENTRY 26/* at most 20 LFN entries, keep coherent with fat_dir->longname size ! */#define FATLONG_MAX_ORDER 20#define FATLONG_NAME_CHUNKS 3static unsigned char FATLONG_NAME_POS[FATLONG_NAME_CHUNKS] = {1, 14, 28};static unsigned char FATLONG_NAME_SIZE[FATLONG_NAME_CHUNKS] = {10, 12, 4};#define CLUSTERS_PER_FAT_SECTOR (SECTOR_SIZE / 4)#define CLUSTERS_PER_FAT16_SECTOR (SECTOR_SIZE / 2)#define DIR_ENTRIES_PER_SECTOR (SECTOR_SIZE / DIR_ENTRY_SIZE)#define DIR_ENTRY_SIZE 32#define NAME_BYTES_PER_ENTRY 13#define FAT_BAD_MARK 0x0ffffff7#define FAT_EOF_MARK 0x0ffffff8#define FAT_LONGNAME_PAD_BYTE 0xff#define FAT_LONGNAME_PAD_UCS 0xffffstruct fsinfo {unsigned long freecount; /* last known free cluster count */unsigned long nextfree; /* first cluster to start looking for freeclusters, or 0xffffffff for no hint */};/* fsinfo offsets */#define FSINFO_FREECOUNT 488#define FSINFO_NEXTFREE 492/* Note: This struct doesn't hold the raw values after mounting if* bpb_bytspersec isn't 512. All sector counts are normalized to 512 byte* physical sectors. */struct bpb{int bpb_bytspersec; /* Bytes per sector, typically 512 */unsigned int bpb_secperclus; /* Sectors per cluster */int bpb_rsvdseccnt; /* Number of reserved sectors */int bpb_numfats; /* Number of FAT structures, typically 2 */int bpb_totsec16; /* Number of sectors on the volume (old 16-bit) */int bpb_media; /* Media type (typically 0xf0 or 0xf8) */int bpb_fatsz16; /* Number of used sectors per FAT structure */unsigned long bpb_totsec32; /* Number of sectors on the volume(new 32-bit) */unsigned int last_word; /* 0xAA55 *//**** FAT32 specific *****/long bpb_fatsz32;long bpb_rootclus;long bpb_fsinfo;/* variables for internal use */unsigned long fatsize;unsigned long totalsectors;unsigned long rootdirsector;unsigned long firstdatasector;unsigned long startsector;unsigned long dataclusters;struct fsinfo fsinfo;#ifdef HAVE_FAT16SUPPORTint bpb_rootentcnt; /* Number of dir entries in the root *//* internals for FAT16 support */bool is_fat16; /* true if we mounted a FAT16 partition, false if FAT32 */unsigned int rootdiroffset; /* sector offset of root dir relative to start* of first pseudo cluster */#endif /* #ifdef HAVE_FAT16SUPPORT */#ifdef HAVE_MULTIVOLUME#ifdef HAVE_MULTIDRIVEint drive; /* on which physical device is this located */#endifbool mounted; /* flag if this volume is mounted */#endif};static struct bpb fat_bpbs[NUM_VOLUMES]; /* mounted partition info */static bool initialized = false;static bool flush_fat_disabled = false;static int update_fsinfo(IF_MV_NONVOID(struct bpb* fat_bpb));static int flush_fat(IF_MV_NONVOID(struct bpb* fat_bpb));static int bpb_is_sane(IF_MV_NONVOID(struct bpb* fat_bpb));static void *cache_fat_sector(IF_MV2(struct bpb* fat_bpb,)long secnum, bool dirty);static void unlock_fat_sector(IF_MV2(struct bpb* fat_bpb,)long secnum);static void create_dos_name(const unsigned char *name, unsigned char *newname);static void randomize_dos_name(unsigned char *name);static unsigned long find_free_cluster(IF_MV2(struct bpb* fat_bpb,)unsigned long start);static int transfer(IF_MV2(struct bpb* fat_bpb,) unsigned long start,long count, char* buf, bool write );#define FAT_CACHE_SIZE 4#define FAT_CACHE_MASK (FAT_CACHE_SIZE-1)struct fat_cache_entry{long secnum;bool valid;int locked;bool dirty;#ifdef HAVE_MULTIVOLUMEstruct bpb* fat_vol; /* shared cache for all volumes */#endif};static char fat_cache_sectors[FAT_CACHE_SIZE][SECTOR_SIZE] CACHEALIGN_ATTR;static struct fat_cache_entry fat_cache[FAT_CACHE_SIZE];static struct mutex cache_mutex;static struct mutex tempbuf_mutex;static char fat_tempbuf[SECTOR_SIZE] CACHEALIGN_ATTR;static bool tempbuf_locked;#if defined(HAVE_HOTSWAP) && !(CONFIG_STORAGE & STORAGE_MMC) /* A better condition ?? */void fat_lock(void){mutex_lock(&cache_mutex, TIMEOUT_BLOCK);}void fat_unlock(void){mutex_unlock(&cache_mutex);}#endifstatic long cluster2sec(IF_MV2(struct bpb* fat_bpb,) long cluster){#ifndef HAVE_MULTIVOLUMEstruct bpb* fat_bpb = &fat_bpbs[0];#endif#ifdef HAVE_FAT16SUPPORT/* negative clusters (FAT16 root dir) don't get the 2 offset */int zerocluster = cluster < 0 ? 0 : 2;#elseconst long zerocluster = 2;#endifif (cluster > (long)(fat_bpb->dataclusters + 1)){DEBUGF( "cluster2sec() - Bad cluster number (%ld)", cluster);return -1;}return (cluster - zerocluster) * fat_bpb->bpb_secperclus+ fat_bpb->firstdatasector;}void fat_size_mv(int volume, unsigned long* size, unsigned long* free){struct bpb* fat_bpb = &fat_bpbs[volume];if (size)*size = fat_bpb->dataclusters * (fat_bpb->bpb_secperclus * SECTOR_SIZE / 1024);if (free)*free = fat_bpb->fsinfo.freecount * (fat_bpb->bpb_secperclus * SECTOR_SIZE / 1024);}void fat_size(IF_MV2(int volume,) unsigned long* size, unsigned long* free){#ifndef HAVE_MULTIVOLUMEconst int volume = 0;#endiffat_size_mv(volume, size, free);}void fat_init(void){unsigned int i;if (!initialized){initialized = true;mutex_init(&cache_mutex);mutex_init(&tempbuf_mutex);tempbuf_locked = false;}/* mark the FAT cache as unused */for(i = 0;i < FAT_CACHE_SIZE;i++){fat_cache[i].secnum = -1;fat_cache[i].valid = false;fat_cache[i].locked = 0;fat_cache[i].dirty = false;#ifdef HAVE_MULTIVOLUMEfat_cache[i].fat_vol = NULL;#endif}#ifdef HAVE_MULTIVOLUME/* mark the possible volumes as not mounted */for (i=0; i<NUM_VOLUMES;i++){fat_bpbs[i].mounted = false;}#endif}int fat_mount(IF_MV2(int volume,) IF_MD2(int drive,) long startsector){#ifndef HAVE_MULTIVOLUMEconst int volume = 0;#endifstruct bpb* fat_bpb = &fat_bpbs[volume];int rc;int secmult;long datasec;#ifdef HAVE_FAT16SUPPORTint rootdirsectors;#endif/* Read the sector */unsigned char* buf = fat_get_sector_buffer();rc = storage_read_sectors(IF_MD2(drive,) startsector,1,buf);if (IS_ERR(rc)){fat_release_sector_buffer();DEBUGF("fat_mount() - Couldn't read BPB (error code %d)", rc);PASS_RC(rc, 3, 0);}memset(fat_bpb, 0, sizeof(struct bpb));fat_bpb->startsector = startsector;#ifdef HAVE_MULTIDRIVEfat_bpb->drive = drive;#endiffat_bpb->bpb_bytspersec = BYTES2INT16(buf,BPB_BYTSPERSEC);secmult = fat_bpb->bpb_bytspersec / SECTOR_SIZE;/* Sanity check is performed later */fat_bpb->bpb_secperclus = secmult * buf[BPB_SECPERCLUS];fat_bpb->bpb_rsvdseccnt = secmult * BYTES2INT16(buf,BPB_RSVDSECCNT);fat_bpb->bpb_numfats = buf[BPB_NUMFATS];fat_bpb->bpb_media = buf[BPB_MEDIA];fat_bpb->bpb_fatsz16 = secmult * BYTES2INT16(buf,BPB_FATSZ16);fat_bpb->bpb_fatsz32 = secmult * BYTES2INT32(buf,BPB_FATSZ32);fat_bpb->bpb_totsec16 = secmult * BYTES2INT16(buf,BPB_TOTSEC16);fat_bpb->bpb_totsec32 = secmult * 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;elsefat_bpb->fatsize = fat_bpb->bpb_fatsz32;if (fat_bpb->bpb_totsec16 != 0)fat_bpb->totalsectors = fat_bpb->bpb_totsec16;elsefat_bpb->totalsectors = fat_bpb->bpb_totsec32;#ifdef HAVE_FAT16SUPPORTfat_bpb->bpb_rootentcnt = BYTES2INT16(buf,BPB_ROOTENTCNT);if (!fat_bpb->bpb_bytspersec){fat_release_sector_buffer();RET_ERR(1);}rootdirsectors = secmult * ((fat_bpb->bpb_rootentcnt * DIR_ENTRY_SIZE+ 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;if (fat_bpb->bpb_secperclus)fat_bpb->dataclusters = datasec / fat_bpb->bpb_secperclus;else{fat_release_sector_buffer();RET_ERR(2);}#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 )#elseif ( fat_bpb->dataclusters < 65525 )#endif{ /* FAT16 */#ifdef HAVE_FAT16SUPPORTfat_bpb->is_fat16 = true;if (fat_bpb->dataclusters < 4085){ /* FAT12 */fat_release_sector_buffer();DEBUGF("This is FAT12. Go away!");RET_ERR(3);}#else /* #ifdef HAVE_FAT16SUPPORT */fat_release_sector_buffer();DEBUGF("This is not FAT32. Go away!");RET_ERR(3);#endif /* #ifndef HAVE_FAT16SUPPORT */}#ifdef HAVE_FAT16SUPPORTif (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 = secmult * 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){fat_release_sector_buffer();DEBUGF( "fat_mount() - BPB is not sane");RET_ERR(4);}#ifdef HAVE_FAT16SUPPORTif (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 = storage_read_sectors(IF_MD2(drive,)startsector + fat_bpb->bpb_fsinfo, 1, buf);if (IS_ERR(rc)){fat_release_sector_buffer();DEBUGF( "fat_mount() - Couldn't read FSInfo (error code %d)", rc);PASS_RC(rc, 3, 5);}fat_bpb->fsinfo.freecount = BYTES2INT32(buf, FSINFO_FREECOUNT);fat_bpb->fsinfo.nextfree = BYTES2INT32(buf, FSINFO_NEXTFREE);}fat_release_sector_buffer();/* calculate freecount if unset */if ( fat_bpb->fsinfo.freecount == 0xffffffff ){fat_recalc_free(IF_MV(volume));}DEBUGF("Freecount: %ld",fat_bpb->fsinfo.freecount);DEBUGF("Nextfree: 0x%lx",fat_bpb->fsinfo.nextfree);DEBUGF("Cluster count: 0x%lx",fat_bpb->dataclusters);DEBUGF("Sectors per cluster: %d",fat_bpb->bpb_secperclus);DEBUGF("FAT sectors: 0x%lx",fat_bpb->fatsize);#ifdef HAVE_MULTIVOLUMEfat_bpb->mounted = true;#endifreturn 0;}#ifdef HAVE_HOTSWAPint fat_unmount(int volume, bool flush){int rc;#ifdef HAVE_MULTIVOLUMEstruct bpb* fat_bpb = &fat_bpbs[volume];#else(void)volume;#endifif(flush){rc = flush_fat(IF_MV(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, TIMEOUT_BLOCK);for(i = 0;i < FAT_CACHE_SIZE;i++){struct fat_cache_entry *fce = &fat_cache[i];if((fce->valid || fce->locked)#ifdef HAVE_MULTIVOLUME&& fce->fat_vol == fat_bpb#endif){fce->valid = false; /* discard all from that volume */fce->locked = 0;fce->dirty = false;}}mutex_unlock(&cache_mutex);rc = 0;}#ifdef HAVE_MULTIVOLUMEfat_bpb->mounted = false;#endifreturn rc;}#endif /* #ifdef HAVE_HOTSWAP */void fat_recalc_free(IF_MV_NONVOID(int volume)){#ifndef HAVE_MULTIVOLUMEconst int volume = 0;#endifstruct bpb* fat_bpb = &fat_bpbs[volume];long free = 0;unsigned long i;#ifdef HAVE_FAT16SUPPORTif (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 (letoh16(fat[j]) == 0x0000) {free++;if ( fat_bpb->fsinfo.nextfree == 0xffffffff )fat_bpb->fsinfo.nextfree = c;}}unlock_fat_sector(IF_MV2(fat_bpb,) i);}}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 (!(letoh32(fat[j]) & 0x0fffffff)) {free++;if ( fat_bpb->fsinfo.nextfree == 0xffffffff )fat_bpb->fsinfo.nextfree = c;}}unlock_fat_sector(IF_MV2(fat_bpb,) i);}}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_MULTIVOLUMEstruct bpb* fat_bpb = &fat_bpbs[0];#endifif(fat_bpb->bpb_bytspersec % SECTOR_SIZE){DEBUGF( "bpb_is_sane() - Error: sector size is not sane (%d)",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)",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)",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)",fat_bpb->bpb_media);}if(fat_bpb->last_word != 0xaa55){DEBUGF( "bpb_is_sane() - Error: Last word is not ""0xaa55 (0x%04x)", 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)", fat_bpb->fsinfo.freecount);return -4;}return 0;}static void flush_fat_sector(struct fat_cache_entry *fce,unsigned char *sectorbuf){int rc;long secnum;/* With multivolume, use only the FAT info from the cached sector! */#ifdef HAVE_MULTIVOLUMEsecnum = fce->secnum + fce->fat_vol->startsector;#elsesecnum = fce->secnum + fat_bpbs[0].startsector;#endif/* Write to the first FAT */rc = storage_write_sectors(IF_MD2(fce->fat_vol->drive,)secnum, 1,sectorbuf);if(rc < 0){panicf(PANIC_KILLUSERTHREADS, "flush_fat_sector() - Could not write sector %ld"" (error %d)",secnum, rc);}#ifdef HAVE_MULTIVOLUMEif(fce->fat_vol->bpb_numfats > 1)#elseif(fat_bpbs[0].bpb_numfats > 1)#endif{/* Write to the second FAT */#ifdef HAVE_MULTIVOLUMEsecnum += fce->fat_vol->fatsize;#elsesecnum += fat_bpbs[0].fatsize;#endifrc = storage_write_sectors(IF_MD2(fce->fat_vol->drive,)secnum, 1, sectorbuf);if(rc < 0){panicf(PANIC_KILLUSERTHREADS, "flush_fat_sector() - Could not write sector %ld"" (error %d)",secnum, rc);}}fce->dirty = false;}static void *cache_fat_sector(IF_MV2(struct bpb* fat_bpb,)long fatsector, bool dirty){#ifndef HAVE_MULTIVOLUMEstruct bpb* fat_bpb = &fat_bpbs[0];#endiflong 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, TIMEOUT_BLOCK); /* make changes atomic *//* Delete the cache entry if it isn't the sector we want */if(fce->valid && (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->valid = false;}/* Load the sector if it is not cached */if(!fce->valid){rc = storage_read_sectors(IF_MD2(fat_bpb->drive,)secnum + fat_bpb->startsector,1,sectorbuf);if(rc < 0){DEBUGF( "cache_fat_sector() - Could not read sector %ld"" (error %d)", secnum, rc);mutex_unlock(&cache_mutex);return NULL;}fce->valid = true;fce->secnum = secnum;#ifdef HAVE_MULTIVOLUMEfce->fat_vol = fat_bpb;#endif}fce->locked++;if (dirty)fce->dirty = true; /* dirt remains, sticky until flushed */mutex_unlock(&cache_mutex);return sectorbuf;}static void unlock_fat_sector(IF_MV2(struct bpb* fat_bpb,) long fatsector){#ifndef HAVE_MULTIVOLUMEstruct bpb* fat_bpb = &fat_bpbs[0];#endiflong secnum = fatsector + fat_bpb->bpb_rsvdseccnt;int cache_index = secnum & FAT_CACHE_MASK;fat_cache[cache_index].locked--;}void* fat_get_sector_buffer(){mutex_lock(&tempbuf_mutex, TIMEOUT_BLOCK);if (tempbuf_locked)panicf(PANIC_KILLUSERTHREADS, "FAT: Tried to lock temporary sector buffer twice!");tempbuf_locked = true;return fat_tempbuf;}void fat_release_sector_buffer(){tempbuf_locked = false;mutex_unlock(&tempbuf_mutex);}static unsigned long find_free_cluster(IF_MV2(struct bpb* fat_bpb,)unsigned long startcluster){#ifndef HAVE_MULTIVOLUMEstruct bpb* fat_bpb = &fat_bpbs[0];#endifunsigned long sector;unsigned long offset;unsigned long i;#ifdef HAVE_FAT16SUPPORTif (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 (letoh16(fat[k]) == 0x0000) {unsigned int c = nr * CLUSTERS_PER_FAT16_SECTOR + k;/* Ignore the reserved clusters 0 & 1, and alsocluster numbers out of bounds */if ( c < 2 || c > fat_bpb->dataclusters+1 )continue;unlock_fat_sector(IF_MV2(fat_bpb,) nr);DEBUGF("find_free_cluster(%x) == %x",startcluster,c);fat_bpb->fsinfo.nextfree = c;return c;}}unlock_fat_sector(IF_MV2(fat_bpb,) nr);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 (!(letoh32(fat[k]) & 0x0fffffff)) {unsigned long c = nr * CLUSTERS_PER_FAT_SECTOR + k;/* Ignore the reserved clusters 0 & 1, and alsocluster numbers out of bounds */if ( c < 2 || c > fat_bpb->dataclusters+1 )continue;unlock_fat_sector(IF_MV2(fat_bpb,) nr);DEBUGF("find_free_cluster(%lx) == %lx",startcluster,c);fat_bpb->fsinfo.nextfree = c;return c;}}unlock_fat_sector(IF_MV2(fat_bpb,) nr);offset = 0;}}DEBUGF("find_free_cluster(%lx) == 0",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_MULTIVOLUMEstruct bpb* fat_bpb = &fat_bpbs[0];#endif#ifdef HAVE_FAT16SUPPORTif (fat_bpb->is_fat16){int sector = entry / CLUSTERS_PER_FAT16_SECTOR;int offset = entry % CLUSTERS_PER_FAT16_SECTOR;unsigned short* sec;val &= 0xFFFF;DEBUGF("update_fat_entry(%x,%x)",entry,val);if (entry==val)panicf(PANIC_KILLUSERTHREADS, "Creating FAT loop: %lx,%lx",entry,val);if ( entry < 2 )panicf(PANIC_KILLUSERTHREADS, "Updating reserved FAT entry %ld.",entry);sec = cache_fat_sector(IF_MV2(fat_bpb,) sector, true);if (!sec){DEBUGF( "update_fat_entry() - Could not cache sector %d", sector);return -1;}if ( val ) {if (letoh16(sec[offset]) == 0x0000 && fat_bpb->fsinfo.freecount > 0)fat_bpb->fsinfo.freecount--;}else {if (letoh16(sec[offset]))fat_bpb->fsinfo.freecount++;}DEBUGF("update_fat_entry: %d free clusters",fat_bpb->fsinfo.freecount);sec[offset] = htole16(val);unlock_fat_sector(IF_MV2(fat_bpb,) sector);}else#endif /* #ifdef HAVE_FAT16SUPPORT */{long sector = entry / CLUSTERS_PER_FAT_SECTOR;int offset = entry % CLUSTERS_PER_FAT_SECTOR;unsigned long* sec;DEBUGF("update_fat_entry(%lx,%lx)",entry,val);if (entry==val)panicf(PANIC_KILLUSERTHREADS, "Creating FAT loop: %lx,%lx",entry,val);if ( entry < 2 )panicf(PANIC_KILLUSERTHREADS, "Updating reserved FAT entry %ld.",entry);sec = cache_fat_sector(IF_MV2(fat_bpb,) sector, true);if (!sec){DEBUGF("update_fat_entry() - Could not cache sector %ld", sector);return -1;}if ( val ) {if (!(letoh32(sec[offset]) & 0x0fffffff) &&fat_bpb->fsinfo.freecount > 0)fat_bpb->fsinfo.freecount--;}else {if (letoh32(sec[offset]) & 0x0fffffff)fat_bpb->fsinfo.freecount++;}DEBUGF("update_fat_entry: %ld free clusters",fat_bpb->fsinfo.freecount);/* don't change top 4 bits */sec[offset] &= htole32(0xf0000000);sec[offset] |= htole32(val & 0x0fffffff);unlock_fat_sector(IF_MV2(fat_bpb,) sector);}return 0;}static long read_fat_entry(IF_MV2(struct bpb* fat_bpb,) unsigned long entry){#ifdef HAVE_FAT16SUPPORT#ifndef HAVE_MULTIVOLUMEstruct bpb* fat_bpb = &fat_bpbs[0];#endifif (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", sector);return -1;}long val = letoh16(sec[offset]);unlock_fat_sector(IF_MV2(fat_bpb,) sector);return val;}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", sector);return -1;}long val = letoh32(sec[offset]) & 0x0fffffff;unlock_fat_sector(IF_MV2(fat_bpb,) sector);return val;}}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_MULTIVOLUMEstruct bpb* fat_bpb = &fat_bpbs[0];#endifif (fat_bpb->is_fat16){eof_mark &= 0xFFFF; /* only 16 bit */if (cluster < 0) /* FAT16 root dir */return cluster + 1; /* don't use the FAT */}#endifnext_cluster = read_fat_entry(IF_MV2(fat_bpb,) cluster);/* is this last cluster in chain? */if ( next_cluster >= eof_mark )return 0;elsereturn next_cluster;}static int update_fsinfo(IF_MV_NONVOID(struct bpb* fat_bpb)){#ifndef HAVE_MULTIVOLUMEstruct bpb* fat_bpb = &fat_bpbs[0];#endifunsigned long* intptr;int rc;#ifdef HAVE_FAT16SUPPORTif (fat_bpb->is_fat16)return 0; /* FAT16 has no FsInfo */#endif /* #ifdef HAVE_FAT16SUPPORT *//* update fsinfo */unsigned char* fsinfo = fat_get_sector_buffer();rc = storage_read_sectors(IF_MD2(fat_bpb->drive,)fat_bpb->startsector + fat_bpb->bpb_fsinfo, 1,fsinfo);if (rc < 0){fat_release_sector_buffer();DEBUGF( "update_fsinfo() - Couldn't read FSInfo (error code %d)", rc);return rc * 10 - 1;}intptr = (long*)&(fsinfo[FSINFO_FREECOUNT]);*intptr = htole32(fat_bpb->fsinfo.freecount);intptr = (long*)&(fsinfo[FSINFO_NEXTFREE]);*intptr = htole32(fat_bpb->fsinfo.nextfree);rc = storage_write_sectors(IF_MD2(fat_bpb->drive,)fat_bpb->startsector + fat_bpb->bpb_fsinfo,1,fsinfo);fat_release_sector_buffer();if (rc < 0){DEBUGF( "update_fsinfo() - Couldn't write FSInfo (error code %d)", 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;if (flush_fat_disabled){DEBUGF("flush_fat() skipped");return 0;}DEBUGF("flush_fat()");mutex_lock(&cache_mutex, TIMEOUT_BLOCK);for(i = 0;i < FAT_CACHE_SIZE;i++){struct fat_cache_entry *fce = &fat_cache[i];if(fce->valid#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 ){#if CONFIG_RTCstruct 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;#elseif (date) *date = 0;if (time) *time = 0;if (tenth) *tenth = 0;#endif /* CONFIG_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* entry;unsigned int idx = firstentry % DIR_ENTRIES_PER_SECTOR;unsigned int sector = firstentry / DIR_ENTRIES_PER_SECTOR;unsigned char chksum = 0;unsigned int i, j=0;unsigned int nameidx=0, namelen = strlen(name);int rc;unsigned short name_utf16[namelen + 1];DEBUGF("write_long_name(file:%lx, first:%d, num:%d, name:%s)",file->firstcluster, firstentry, numentries, name);rc = fat_seek(file, sector);if (rc<0)return rc * 10 - 1;unsigned char* buf = fat_get_sector_buffer();rc = fat_readwrite(file, 1, buf, false);if (rc<1){fat_release_sector_buffer();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);/* we need to convert the name first *//* since it is written in reverse order */for (i = 0; i <= namelen; i++)name_utf16[i] = *(name++);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){fat_release_sector_buffer();return rc * 10 - 3;}rc = fat_readwrite(file, 1, buf, true);if (rc<1){fat_release_sector_buffer();return rc * 10 - 4;}/* read next sector */rc = fat_readwrite(file, 1, buf, false);if (rc<0) {fat_release_sector_buffer();DEBUGF("Failed writing new sector: %d",rc);return rc * 10 - 5;}if (rc==0)/* end of dir */memset(buf, 0, SECTOR_SIZE);sector++;idx = 0;}entry = buf + idx * DIR_ENTRY_SIZE;/* verify this entry is free */if (entry[0] && entry[0] != 0xe5 ){fat_release_sector_buffer();panicf(PANIC_KILLUSERTHREADS, "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 */unsigned int k, l = nameidx;entry[FATLONG_ORDER] = numentries-i-1;if (i==0) {/* mark this as last long entry */entry[FATLONG_ORDER] |= FATLONG_LAST_LONG_ENTRY;/* pad name with 0xffff */for (k=1; k<11; k++) entry[k] = FAT_LONGNAME_PAD_BYTE;for (k=14; k<26; k++) entry[k] = FAT_LONGNAME_PAD_BYTE;for (k=28; k<32; k++) entry[k] = FAT_LONGNAME_PAD_BYTE;};/* set name */for (k=0; k<5 && l <= namelen; k++) {entry[k*2 + 1] = (unsigned char)(name_utf16[l] & 0xff);entry[k*2 + 2] = (unsigned char)(name_utf16[l++] >> 8);}for (k=0; k<6 && l <= namelen; k++) {entry[k*2 + 14] = (unsigned char)(name_utf16[l] & 0xff);entry[k*2 + 15] = (unsigned char)(name_utf16[l++] >> 8);}for (k=0; k<2 && l <= namelen; k++) {entry[k*2 + 28] = (unsigned char)(name_utf16[l] & 0xff);entry[k*2 + 29] = (unsigned char)(name_utf16[l++] >> 8);}entry[FATDIR_ATTR] = FAT_ATTR_LONG_NAME;entry[FATDIR_FSTCLUSLO] = 0;entry[FATLONG_TYPE] = 0;entry[FATLONG_CHKSUM] = chksum;DEBUGF("Longname entry %d (%d): %s", idx, nameidx, name+nameidx);}else {/* shortname entry */unsigned short date=0, time=0, tenth=0;DEBUGF("Shortname entry: %s", shortname);memcpy(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) = htole16(time);*(unsigned short*)(entry + FATDIR_WRTTIME) = htole16(time);*(unsigned short*)(entry + FATDIR_CRTDATE) = htole16(date);*(unsigned short*)(entry + FATDIR_WRTDATE) = htole16(date);*(unsigned short*)(entry + FATDIR_LSTACCDATE) = htole16(date);}idx++;nameidx -= NAME_BYTES_PER_ENTRY;}/* update last sector */rc = fat_seek(file, sector);if (rc<0){fat_release_sector_buffer();return rc * 10 - 6;}rc = fat_readwrite(file, 1, buf, true);fat_release_sector_buffer();if (rc<1)return rc * 10 - 7;DEBUGF("write_long_name: success");return 0;}static int fat_checkname(const unsigned char* newname){static const char invalid_chars[] = "\"*/:<>?\\|";int len = strlen(newname);/* More sanity checks are probably needed */if (len > 255 || newname[len - 1] == '.'){return -1;}while (*newname){if (*newname < ' ' || strchr(invalid_chars, *newname) != NULL)return -1;newname++;}/* check trailing space(s) */if(*(--newname) == ' ')return -1;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_MULTIVOLUMEstruct bpb* fat_bpb = &fat_bpbs[dir->file.volume];#elsestruct bpb* fat_bpb = &fat_bpbs[0];#endifunsigned char shortname[12];int rc;unsigned int sector;bool done = false;int entries_needed, entries_found = 0;int firstentry;DEBUGF( "add_dir_entry(%s,%lx)",name, file->firstcluster);/* Don't check dotdirs name for validity */if (dotdir == false) {rc = fat_checkname(name);if (rc < 0) {/* filename is invalid */return rc * 10 - 1;}}#ifdef HAVE_MULTIVOLUMEfile->volume = dir->file.volume; /* inherit the volume, to make sure */#endif/* The "." and ".." directory entries must not be long names */if(dotdir) {int i;strlcpy(shortname, name, 12);for(i = strlen(shortname); i < 12; i++)shortname[i] = ' ';entries_needed = 1;} else {create_dos_name(name, shortname);/* one dir entry needed for every 13 bytes of filename,plus one entry for the short name */entries_needed = (strlen(name) + (NAME_BYTES_PER_ENTRY-1))/ NAME_BYTES_PER_ENTRY + 1;}unsigned char* buf = fat_get_sector_buffer();restart:firstentry = -1;rc = fat_seek(&dir->file, 0);if (rc < 0){fat_release_sector_buffer();return rc * 10 - 2;}/* step 1: search for free entries and check for duplicate shortname */for (sector = 0; !done; sector++){unsigned int i;rc = fat_readwrite(&dir->file, 1, buf, false);if (rc < 0) {fat_release_sector_buffer();DEBUGF( "add_dir_entry() - Couldn't read dir"" (error code %d)", rc);return rc * 10 - 3;}if (rc == 0) { /* current end of dir reached */DEBUGF("End of dir on cluster boundary");break;}/* look for free slots */for (i = 0; i < DIR_ENTRIES_PER_SECTOR; i++){switch (buf[i * DIR_ENTRY_SIZE]) {case 0:entries_found += DIR_ENTRIES_PER_SECTOR - i;DEBUGF("Found end of dir %d",sector * DIR_ENTRIES_PER_SECTOR + i);i = DIR_ENTRIES_PER_SECTOR - 1;done = true;break;case 0xe5:entries_found++;DEBUGF("Found free entry %d (%d/%d)",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, 11)) {/* shortname exists already, make a new one */randomize_dos_name(shortname);DEBUGF("Duplicate shortname, changing to %s",shortname);/* name has changed, we need to restart search */goto restart;}break;}if (firstentry < 0 && (entries_found >= entries_needed))firstentry = sector * DIR_ENTRIES_PER_SECTOR + i + 1- entries_found;}}/* step 2: extend the dir if necessary */if (firstentry < 0){DEBUGF("Adding new sector(s) to dir");rc = fat_seek(&dir->file, sector);if (rc < 0){fat_release_sector_buffer();return rc * 10 - 4;}memset(buf, 0, SECTOR_SIZE);/* we must clear whole clusters */for (; (entries_found < entries_needed) ||(dir->file.sectornum < (int)fat_bpb->bpb_secperclus); sector++){if (sector >= (65536/DIR_ENTRIES_PER_SECTOR)){fat_release_sector_buffer();return -5; /* dir too large -- FAT specification */}rc = fat_readwrite(&dir->file, 1, buf, true);if (rc < 1) /* No more room or something went wrong */{fat_release_sector_buffer();return rc * 10 - 6;}entries_found += DIR_ENTRIES_PER_SECTOR;}firstentry = sector * DIR_ENTRIES_PER_SECTOR - entries_found;}fat_release_sector_buffer();/* step 3: add entry */sector = firstentry / DIR_ENTRIES_PER_SECTOR;DEBUGF("Adding longname to entry %d in sector %d",firstentry, sector);rc = write_long_name(&dir->file, firstentry,entries_needed, name, shortname, is_directory);if (rc < 0)return rc * 10 - 7;/* remember where the shortname dir entry is located */file->direntry = firstentry + entries_needed - 1;file->direntries = entries_needed;file->dircluster = dir->file.firstcluster;DEBUGF("Added new dir entry %d, using %d slots.",file->direntry, file->direntries);return 0;}static unsigned char char2dos(unsigned char c, int* randomize){static const char invalid_chars[] = "\"*+,./:;<=>?[\\]|";if (c <= 0x20)c = 0; /* Illegal char, remove */else if (strchr(invalid_chars, c) != NULL){/* Illegal char, replace */c = '_';*randomize = 1; /* as per FAT spec */}elsec = toupper(c);return c;}static void create_dos_name(const unsigned char *name, unsigned char *newname){int i;unsigned char *ext;int randomize = 0;/* Find extension part */ext = strrchr(name, '.');if (ext == name) /* handle .dotnames */ext = NULL;/* needs to randomize? */if((ext && (strlen(ext) > 4)) ||((ext ? (unsigned int)(ext-name) : strlen(name)) > 8) )randomize = 1;/* Name part */for (i = 0; *name && (!ext || name < ext) && (i < 8); name++){unsigned char c = char2dos(*name, &randomize);if (c)newname[i++] = c;}/* Pad both name and extension */while (i < 11)newname[i++] = ' ';if (newname[0] == 0xe5) /* Special kanji character */newname[0] = 0x05;if (ext){ /* Extension part */ext++;for (i = 8; *ext && (i < 11); ext++){unsigned char c = char2dos(*ext, &randomize);if (c)newname[i++] = c;}}if(randomize)randomize_dos_name(newname);}static void randomize_dos_name(unsigned char *name){unsigned char* tilde = NULL; /* ~ location */unsigned char* lastpt = NULL; /* last point of filename */unsigned char* nameptr = name; /* working copy of name pointer */unsigned char num[9]; /* holds number as string */int i = 0;int cnt = 1;int numlen;int offset;while(i++ < 8){/* hunt for ~ and where to put it */if((!tilde) && (*nameptr == '~'))tilde = nameptr;if((!lastpt) && ((*nameptr == ' ' || *nameptr == '~')))lastpt = nameptr;nameptr++;}if(tilde){/* extract current count and increment */memcpy(num,tilde+1,7-(unsigned int)(tilde-name));num[7-(unsigned int)(tilde-name)] = 0;cnt = atoi(num) + 1;}cnt %= 10000000; /* protection */snprintf(num, 9, "~%d", cnt); /* allow room for trailing zero */numlen = strlen(num); /* required space */offset = (unsigned int)(lastpt ? lastpt - name : 8); /* prev startpoint */if(offset > (8-numlen)) offset = 8-numlen; /* correct for new numlen */memcpy(&name[offset], num, numlen);/* in special case of counter overflow: pad with spaces */for(offset = offset+numlen; offset < 8; offset++)name[offset] = ' ';}static int update_short_entry( struct fat_file* file, long size, int attr ){int sector = file->direntry / DIR_ENTRIES_PER_SECTOR;unsigned long* sizeptr;unsigned short* clusptr;struct fat_file dir;int rc;DEBUGF("update_file_size(cluster:%lx entry:%d size:%ld)",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;unsigned char* buf = fat_get_sector_buffer();unsigned char* entry =buf + DIR_ENTRY_SIZE * (file->direntry % DIR_ENTRIES_PER_SECTOR);rc = fat_readwrite(&dir, 1, buf, false);if (rc < 1){fat_release_sector_buffer();return rc * 10 - 3;}if (!entry[0] || entry[0] == 0xe5){fat_release_sector_buffer();panicf(PANIC_KILLUSERTHREADS, "Updating size on empty dir entry %d", file->direntry);}entry[FATDIR_ATTR] = attr & 0xFF;clusptr = (short*)(entry + FATDIR_FSTCLUSHI);*clusptr = htole16(file->firstcluster >> 16);clusptr = (short*)(entry + FATDIR_FSTCLUSLO);*clusptr = htole16(file->firstcluster & 0xffff);sizeptr = (long*)(entry + FATDIR_FILESIZE);*sizeptr = htole32(size);{#if CONFIG_RTCunsigned short time = 0;unsigned short date = 0;#else/* get old time to increment from */unsigned short time = htole16(*(unsigned short*)(entry+FATDIR_WRTTIME));unsigned short date = htole16(*(unsigned short*)(entry+FATDIR_WRTDATE));#endiffat_time(&date, &time, NULL);*(unsigned short*)(entry + FATDIR_WRTTIME) = htole16(time);*(unsigned short*)(entry + FATDIR_WRTDATE) = htole16(date);*(unsigned short*)(entry + FATDIR_LSTACCDATE) = htole16(date);}rc = fat_seek( &dir, sector );if (rc < 0){fat_release_sector_buffer();return rc * 10 - 4;}rc = fat_readwrite(&dir, 1, buf, true);fat_release_sector_buffer();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;unsigned char c;bool lowercase;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)(unsigned)BYTES2INT16(buf,FATDIR_FSTCLUSLO)) |((long)(unsigned)BYTES2INT16(buf,FATDIR_FSTCLUSHI) << 16);/* The double cast is to prevent a sign-extension to be done on CalmRISC16.(the result of the shift is always considered signed) *//* fix the name */lowercase = (buf[FATDIR_NTRES] & FAT_NTRES_LC_NAME);c = buf[FATDIR_NAME];if (c == 0x05) /* special kanji char */c = 0xe5;i = 0;while (c != ' ') {de->name[j++] = lowercase ? tolower(c) : c;if (++i >= 8)break;c = buf[FATDIR_NAME+i];}if (buf[FATDIR_NAME+8] != ' ') {lowercase = (buf[FATDIR_NTRES] & FAT_NTRES_LC_EXT);de->name[j++] = '.';for (i = 8; (i < 11) && ((c = buf[FATDIR_NAME+i]) != ' '); i++)de->name[j++] = lowercase ? tolower(c) : c;}return 1;}int fat_open(IF_MV2(int volume,)long startcluster,struct fat_file *file,const struct fat_dir* dir){/* Remember where the file's dir entry is located* Do it before assigning other fields so that fat_open* can be called with file == &dir->file (see fat_opendir) */if ( dir ) {file->direntry = dir->entry - 1;file->direntries = dir->entrycount;file->dircluster = dir->file.firstcluster;}file->firstcluster = startcluster;file->lastcluster = startcluster;file->lastsector = 0;file->clusternum = 0;file->sectornum = 0;file->eof = false;#ifdef HAVE_MULTIVOLUMEfile->volume = volume;/* fixme: remove error check when done */if (volume >= NUM_VOLUMES || !fat_bpbs[volume].mounted){DEBUGF("fat_open() illegal volume %d", volume);return -1;}#endifDEBUGF("fat_open(%lx), entry %d",startcluster,file->direntry);return 0;}int fat_create_file(const char* name,struct fat_file* file,struct fat_dir* dir){int rc;DEBUGF("fat_create_file(\"%s\",%lx,%lx)",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* dir){#ifdef HAVE_MULTIVOLUMEstruct bpb* fat_bpb = &fat_bpbs[dir->file.volume];#elsestruct bpb* fat_bpb = &fat_bpbs[0];#endifint i;long sector;int rc;struct fat_file newdir;DEBUGF("fat_create_dir(\"%s\",%lx)",name,(long)dir);/* First, add the entry in the parent directory */rc = add_dir_entry(dir, &newdir, name, true, false);if (rc < 0)return rc * 10 - 1;/* Allocate a new cluster for the directory */newdir.firstcluster = find_free_cluster(IF_MV2(fat_bpb,)fat_bpb->fsinfo.nextfree);if(newdir.firstcluster == 0)return -6;update_fat_entry(IF_MV2(fat_bpb,) newdir.firstcluster, FAT_EOF_MARK);/* Clear the entire cluster */unsigned char* buf = fat_get_sector_buffer();sector = cluster2sec(IF_MV2(fat_bpb,) newdir.firstcluster);for(i = 0;i < (int)fat_bpb->bpb_secperclus;i++) {memset(buf, 0, SECTOR_SIZE);if (!i){memcpy(buf, ". \x10", 12);memcpy(&buf[0x20], ".. \x10", 12);((uint16_t*)buf)[0xd] = newdir.firstcluster;((uint16_t*)buf)[0xa] = newdir.firstcluster >> 16;if(dir->file.firstcluster != fat_bpb->bpb_rootclus){((uint16_t*)buf)[0x1d] = dir->file.firstcluster;((uint16_t*)buf)[0x1a] = dir->file.firstcluster >> 16;}}rc = transfer(IF_MV2(fat_bpb,) sector + i, 1, buf, true );if (rc < 0){fat_release_sector_buffer();return rc * 10 - 2;}}fat_release_sector_buffer();/* Set the firstcluster field in the direntry */update_short_entry(&newdir, 0, FAT_ATTR_DIRECTORY);rc = flush_fat(IF_MV(fat_bpb));if (rc < 0)return rc * 10 - 5;return 0;}int fat_truncate(const struct fat_file *file){/* truncate trailing clusters */long next;long last = file->lastcluster;#ifdef HAVE_MULTIVOLUMEstruct bpb* fat_bpb = &fat_bpbs[file->volume];#endifDEBUGF("fat_truncate(%lx, %lx)", 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_MULTIVOLUMEstruct bpb* fat_bpb = &fat_bpbs[file->volume];#endifDEBUGF("fat_closewrite(size=%ld)",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_FATif ( file->firstcluster ) {/* debug */#ifdef HAVE_MULTIVOLUMEstruct bpb* fat_bpb = &fat_bpbs[file->volume];#elsestruct bpb* fat_bpb = &fat_bpbs[0];#endiflong count = 0;long len;long next;for ( next = file->firstcluster; next;next = get_next_cluster(IF_MV2(fat_bpb,) next) ) {DEBUGF("cluster %ld: %lx", count, next);count++;}len = count * fat_bpb->bpb_secperclus * SECTOR_SIZE;DEBUGF("File is %ld clusters (chainlen=%ld, size=%ld)",count, len, size );if ( len > size + fat_bpb->bpb_secperclus * SECTOR_SIZE)panicf(PANIC_KILLUSERTHREADS, "Cluster chain is too long");if ( len < size )panicf(PANIC_KILLUSERTHREADS, "Cluster chain is too short");}#endifreturn 0;}static int free_direntries(struct fat_file* file){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;unsigned char* buf = fat_get_sector_buffer();rc = fat_readwrite(&dir, 1, buf, false);if (rc < 1){fat_release_sector_buffer();return rc * 10 - 3;}for (i=0; i < numentries; i++) {DEBUGF("Clearing dir entry %d (%d/%d)",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){fat_release_sector_buffer();return rc * 10 - 4;}rc = fat_readwrite(&dir, 1, buf, true);if (rc < 1){fat_release_sector_buffer();return rc * 10 - 5;}if ( i+1 < numentries ) {/* read next sector */rc = fat_readwrite(&dir, 1, buf, false);if (rc < 1){fat_release_sector_buffer();return rc * 10 - 6;}}sector++;}}if ( entry % DIR_ENTRIES_PER_SECTOR ) {/* flush this sector */rc = fat_seek(&dir, sector);if (rc < 0){fat_release_sector_buffer();return rc * 10 - 7;}rc = fat_readwrite(&dir, 1, buf, true);if (rc < 1){fat_release_sector_buffer();return rc * 10 - 8;}}fat_release_sector_buffer();return 0;}int fat_remove(struct fat_file* file){long next, last = file->firstcluster;int rc;#ifdef HAVE_MULTIVOLUMEstruct bpb* fat_bpb = &fat_bpbs[file->volume];#endifDEBUGF("fat_remove(%lx)",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_file newfile = *file;unsigned char* entry = NULL;unsigned short* clusptr = NULL;unsigned int parentcluster;#ifdef HAVE_MULTIVOLUMEstruct bpb* fat_bpb = &fat_bpbs[file->volume];if (file->volume != dir->file.volume) {DEBUGF("No rename across volumes!");return -1;}#elsestruct bpb* fat_bpb = &fat_bpbs[0];#endifif ( !file->dircluster ) {DEBUGF("File has no dir cluster!");return -2;}/* create new name */rc = add_dir_entry(dir, &newfile, newname, false, false);if (rc < 0)return rc * 10 - 2;/* write size and cluster link */rc = update_short_entry(&newfile, size, attr);if (rc < 0)return rc * 10 - 3;/* remove old name */rc = free_direntries(file);if (rc < 0)return rc * 10 - 4;rc = flush_fat(IF_MV(fat_bpb));if (rc < 0)return rc * 10 - 5;/* if renaming a directory, update the .. entry to make sureit points to its parent directory (we don't check if it was a move) */if(FAT_ATTR_DIRECTORY == attr) {/* open the dir that was renamed, we re-use the newfile struct */rc = fat_open(IF_MV2(volume,) newfile.firstcluster, &newfile, NULL);if (rc < 0)return rc * 10 - 6;/* get the first sector of the dir */rc = fat_seek(&newfile, 0);if (rc < 0)return rc * 10 - 7;unsigned char* buf = fat_get_sector_buffer();rc = fat_readwrite(&newfile, 1, buf, false);if (rc < 0){fat_release_sector_buffer();return rc * 10 - 8;}/* parent cluster is 0 if parent dir is the root - FAT spec (p.29) */if(dir->file.firstcluster == fat_bpb->bpb_rootclus)parentcluster = 0;elseparentcluster = dir->file.firstcluster;entry = buf + DIR_ENTRY_SIZE;if(strncmp(".. ", entry, 11)){fat_release_sector_buffer();/* .. entry must be second entry according to FAT spec (p.29) */DEBUGF("Second dir entry is not double-dot!");return rc * 10 - 9;}clusptr = (short*)(entry + FATDIR_FSTCLUSHI);*clusptr = htole16(parentcluster >> 16);clusptr = (short*)(entry + FATDIR_FSTCLUSLO);*clusptr = htole16(parentcluster & 0xffff);/* write back this sector */rc = fat_seek(&newfile, 0);if (rc < 0){fat_release_sector_buffer();return rc * 10 - 7;}rc = fat_readwrite(&newfile, 1, buf, true);fat_release_sector_buffer();if (rc < 1)return rc * 10 - 8;}return 0;}static long next_write_cluster(struct fat_file* file,long oldcluster,long* newsector){#ifdef HAVE_MULTIVOLUMEstruct bpb* fat_bpb = &fat_bpbs[file->volume];#elsestruct bpb* fat_bpb = &fat_bpbs[0];#endiflong cluster = 0;long sector;DEBUGF("next_write_cluster(%lx,%lx)",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_FAT16SUPPORTelse /* negative, pseudo-cluster of the root dir */return 0; /* impossible to append something to the root */#endifif (cluster) {if (oldcluster)update_fat_entry(IF_MV2(fat_bpb,) oldcluster, cluster);elsefile->firstcluster = cluster;update_fat_entry(IF_MV2(fat_bpb,) cluster, FAT_EOF_MARK);}else {#ifdef TEST_FATif (fat_bpb->fsinfo.freecount>0)panicf(PANIC_KILLUSERTHREADS, "There is free space, but find_free_cluster() ""didn't find it!");#endifDEBUGF("next_write_cluster(): Disk full!");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_MULTIVOLUMEstruct bpb* fat_bpb = &fat_bpbs[0];#endifint rc;DEBUGF("transfer(s=%lx, c=%lx, %s)",start+ fat_bpb->startsector, count, write?"write":"read");if (write) {unsigned long firstallowed;#ifdef HAVE_FAT16SUPPORTif (fat_bpb->is_fat16)firstallowed = fat_bpb->rootdirsector;else#endiffirstallowed = fat_bpb->firstdatasector;if (start < firstallowed)panicf(PANIC_KILLUSERTHREADS, "Write %ld before data", firstallowed - start);if (start + count > fat_bpb->totalsectors)panicf(PANIC_KILLUSERTHREADS, "Write %ld after data",start + count - fat_bpb->totalsectors);rc = storage_write_sectors(IF_MD2(fat_bpb->drive,)start + fat_bpb->startsector, count, buf);}elserc = storage_read_sectors(IF_MD2(fat_bpb->drive,)start + fat_bpb->startsector, count, buf);if (rc < 0) {DEBUGF( "transfer() - Couldn't %s sector %lx"" (error code %d)",write ? "write":"read", start, rc);return rc;}return 0;}long fat_readwrite( struct fat_file *file, long sectorcount,void* buf, bool write ){#ifdef HAVE_MULTIVOLUMEstruct bpb* fat_bpb = &fat_bpbs[file->volume];#elsestruct bpb* fat_bpb = &fat_bpbs[0];#endiflong 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;DEBUGF( "fat_readwrite(file:%lx,count:0x%lx,buf:%lx,%s)",file->firstcluster,sectorcount,(long)buf,write?"write":"read");DEBUGF( "fat_readwrite: sec=%lx numsec=%ld eof=%d",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;long oldsector = sector;long oldnumsec = numsec;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 casewe want to append to the file */sector = oldsector;cluster = oldcluster;numsec = oldnumsec;clusternum--;i = -1; /* Error code */break;}}elseeof = false;}else {if (sector)sector++;else {/* look up first sector of file */sector = cluster2sec(IF_MV2(fat_bpb,) file->firstcluster);numsec=1;#ifdef HAVE_FAT16SUPPORTif (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", i);return i;}int fat_seek(struct fat_file *file, unsigned long seeksector ){#ifdef HAVE_MULTIVOLUMEstruct bpb* fat_bpb = &fat_bpbs[file->volume];#elsestruct bpb* fat_bpb = &fat_bpbs[0];#endiflong clusternum=0, numclusters=0, sectornum=0, sector=0;long cluster = file->firstcluster;long i;#ifdef HAVE_FAT16SUPPORTif (cluster < 0) /* FAT16 root dir */seeksector += fat_bpb->rootdiroffset;#endiffile->eof = false;if (seeksector) {/* we need to find the sector BEFORE the requested, sincethe 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)", seeksector, i);return -1;}}sector = cluster2sec(IF_MV2(fat_bpb,) cluster) + sectornum;}else {sectornum = -1;}DEBUGF("fat_seek(%lx, %lx) == %lx, %lx, %lx",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_MULTIVOLUMEstruct bpb* fat_bpb = &fat_bpbs[volume];/* fixme: remove error check when done */if (volume >= NUM_VOLUMES || !fat_bpbs[volume].mounted){DEBUGF("fat_open() illegal volume %d", volume);return -1;}#elsestruct bpb* fat_bpb = &fat_bpbs[0];#endifint rc;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)", rc);return rc * 10 - 1;}/* assign them after fat_open call so that fat_opendir can be called with the same* fat_dir as parent and result */dir->entry = 0;dir->sector = 0;return 0;}int fat_getnext(struct fat_dir *dir, struct fat_direntry *entry){bool done = false;int i, j;int rc;int order;unsigned char firstbyte;/* Long file names are stored in special entries. Each entry holdsup to 13 characters. Names can be max 255 chars (not bytes!) long *//* The number of long entries in the long name can be retrieve from the first* long entry because there are stored in reverse order and have an ordinal */int nb_longs = 0;/* The long entries are expected to be in order, so remember the last ordinal */int last_long_ord = 0;dir->entrycount = 0;while(!done){if ( !(dir->entry % DIR_ENTRIES_PER_SECTOR) || !dir->sector ){rc = fat_readwrite(&dir->file, 1, dir->sectorcache, false);if (rc == 0) {/* eof */DEBUGF("fat_getnext() - Reached end of dir cluster chain");entry->name[0] = 0;break;}if (rc < 0) {DEBUGF("fat_getnext() - Couldn't read dir"" (error code %d)", 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 = dir->sectorcache[entrypos];dir->entry++;if (firstbyte == 0xe5) {/* free entry */dir->entrycount = 0;continue;}if (firstbyte == 0) {/* last entry */DEBUGF("fat_getnext() - Reached final directory entry");entry->name[0] = 0;dir->entrycount = 0;return 0;}dir->entrycount++;/* LFN entry? */if ( ( dir->sectorcache[entrypos + FATDIR_ATTR] &FAT_ATTR_LONG_NAME_MASK ) == FAT_ATTR_LONG_NAME ) {/* extract ordinal */order = dir->sectorcache[entrypos + FATLONG_ORDER] & ~FATLONG_LAST_LONG_ENTRY;/* is this entry the first long entry ? (first in order but containing last part) */if (dir->sectorcache[entrypos + FATLONG_ORDER] & FATLONG_LAST_LONG_ENTRY) {/* check that order is not too big ! (and non-zero) */if(order <= 0 || order > FATLONG_MAX_ORDER)continue; /* ignore the whole LFN, will trigger lots of warnings */nb_longs = order;last_long_ord = order;}else {/* check orphan entry */if (nb_longs == 0) {DEBUGF("fat warning: orphan LFN entry");/* ignore */continue;}/* check order */if (order != (last_long_ord - 1)) {DEBUGF("fat warning: wrong LFN ordinal");/* ignore the whole LFN, will trigger lots of warnings */nb_longs = 0;}last_long_ord = order;}/* copy part, reuse [order] for another purpose :) */order = (order - 1) * FATLONG_NAME_BYTES_PER_ENTRY;for(j = 0; j < FATLONG_NAME_CHUNKS; j++) {memcpy(dir->longname + order,dir->sectorcache + entrypos + FATLONG_NAME_POS[j],FATLONG_NAME_SIZE[j]);order += FATLONG_NAME_SIZE[j];}}else {if ( parse_direntry(entry, dir->sectorcache + entrypos) ) {/* don't return volume id entry */if ( (entry->attr &(FAT_ATTR_VOLUME_ID|FAT_ATTR_DIRECTORY))== FAT_ATTR_VOLUME_ID)continue;/* replace shortname with longname? *//* check that the long name is complete */if (nb_longs != 0 && last_long_ord == 1) {/* hold a copy of the shortname in case the long one is too long */unsigned char shortname[13]; /* 8+3+dot+\0 */int longname_utf8len = 0;/* One character at a time, add 1 for trailing \0, 4 is the maximum size* of a UTF8 encoded character in rockbox */unsigned char longname_utf8segm[4 + 1];unsigned short ucs;int segm_utf8len;/* Temporarily store short name */strcpy(shortname, entry->name);entry->name[0] = 0;/* Convert the FAT name to a utf8-encoded one.* The name is not necessary NUL-terminated ! */for (j = 0; j < nb_longs * FATLONG_NAME_BYTES_PER_ENTRY; j += 2) {ucs = dir->longname[j] | (dir->longname[j + 1] << 8);if(ucs == 0 || ucs == FAT_LONGNAME_PAD_UCS)break;/* utf8encode will return a pointer after the converted* string, subtract the pointer to the start to get the length of it */segm_utf8len = 1;/* warn the trailing zero ! (FAT_FILENAME_BYTES includes it) */if (longname_utf8len + segm_utf8len >= FAT_FILENAME_BYTES) {/* force use of short name */longname_utf8len = FAT_FILENAME_BYTES + 1;break; /* fallback later */}else {if (ucs < 128) longname_utf8segm[0] = (unsigned char)ucs;else longname_utf8segm[0] = '?';longname_utf8segm[segm_utf8len] = 0;strcat(entry->name + longname_utf8len, longname_utf8segm);longname_utf8len += segm_utf8len;}}/* Does the utf8-encoded name fit into the entry? *//* warn the trailing zero ! (FAT_FILENAME_BYTES includes it) */if (longname_utf8len >= FAT_FILENAME_BYTES) {/* Take the short DOS name. Need to utf8-encode itsince it may contain chars from the upper half ofthe OEM code page which wouldn't be a valid utf8.Beware: this file will be shown with strangeglyphs in file browser since unicode 0x80 to 0x9Fare control characters. */DEBUGF("SN-DOS: %s", shortname);unsigned char *utf8;memcpy(entry->name, shortname, strlen(shortname));*(entry->name + strlen(shortname)) = 0;DEBUGF("SN: %s", entry->name);} else {DEBUGF("LN: %s", entry->name);DEBUGF("LNLen: %d", longname_utf8len);}}done = true;i++;break;}}}}return 0;}unsigned int fat_get_cluster_size(IF_MV_NONVOID(int volume)){#ifndef HAVE_MULTIVOLUMEconst int volume = 0;#endifstruct bpb* fat_bpb = &fat_bpbs[volume];return fat_bpb->bpb_secperclus * SECTOR_SIZE;}#ifdef HAVE_MULTIVOLUMEbool fat_ismounted(int volume){return (volume<NUM_VOLUMES && fat_bpbs[volume].mounted);}#endifvoid fat_enable_flushing(bool state){flush_fat_disabled = !state;if (state) flush_fat();}