/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2002 by Linus Nielsen Feltzing * * All files in this archive are subject to the GNU General Public License. * See the file COPYING in the source tree root for full license agreement. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ #include #include #include #include #include #include #include "fat.h" #include "ata.h" #include "debug.h" #include "panic.h" #include "system.h" #define BYTES2INT16(array,pos) \ (array[pos] | (array[pos+1] << 8 )) #define BYTES2INT32(array,pos) \ (array[pos] | (array[pos+1] << 8 ) | \ (array[pos+2] << 16 ) | (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 ) #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 CLUSTERS_PER_FAT_SECTOR (SECTOR_SIZE / 4) #define DIR_ENTRIES_PER_SECTOR (SECTOR_SIZE / 32) #define DIR_ENTRY_SIZE 32 #define FAT_BAD_MARK 0x0ffffff7 #define FAT_EOF_MARK 0x0ffffff8 struct fsinfo { int freecount; /* last known free cluster count */ int nextfree; /* first cluster to start looking for free clusters, or 0xffffffff for no hint */ }; /* fsinfo offsets */ #define FSINFO_FREECOUNT 488 #define FSINFO_NEXTFREE 492 struct bpb { char bs_oemname[9]; /* OEM string, ending with \0 */ int bpb_bytspersec; /* Bytes per sectory, typically 512 */ int bpb_secperclus; /* Sectors per cluster */ int bpb_rsvdseccnt; /* Number of reserved sectors */ int bpb_numfats; /* Number of FAT structures, typically 2 */ int bpb_rootentcnt; /* Number of dir entries in the root */ 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 */ int bpb_secpertrk; /* Number of sectors per track */ int bpb_numheads; /* Number of heads */ int bpb_hiddsec; /* Hidden sectors before the volume */ unsigned int bpb_totsec32; /* Number of sectors on the volume (new 32-bit) */ int last_word; /* 0xAA55 */ /**** FAT12/16 specific *****/ int bs_drvnum; /* Drive number */ int bs_bootsig; /* Is 0x29 if the following 3 fields are valid */ unsigned int bs_volid; /* Volume ID */ char bs_vollab[12]; /* Volume label, 11 chars plus \0 */ char bs_filsystype[9]; /* File system type, 8 chars plus \0 */ /**** FAT32 specific *****/ int bpb_fatsz32; int bpb_extflags; int bpb_fsver; int bpb_rootclus; int bpb_fsinfo; int bpb_bkbootsec; /* variables for internal use */ int fatsize; int totalsectors; int rootdirsector; int firstdatasector; int startsector; struct fsinfo fsinfo; }; static struct bpb fat_bpb; static int first_sector_of_cluster(int cluster); static int bpb_is_sane(void); static void *cache_fat_sector(int secnum); #ifdef DISK_WRITE static unsigned int getcurrdostime(unsigned short *dosdate, unsigned short *dostime, unsigned char *dostenth); static int create_dos_name(unsigned char *name, unsigned char *newname); static int find_free_cluster(int start); #endif #define FAT_CACHE_SIZE 0x20 #define FAT_CACHE_MASK (FAT_CACHE_SIZE-1) struct fat_cache_entry { int secnum; bool inuse; bool dirty; }; static char fat_cache_sectors[FAT_CACHE_SIZE][SECTOR_SIZE]; static struct fat_cache_entry fat_cache[FAT_CACHE_SIZE]; /* sectors cache for longname use */ static unsigned char lastsector[SECTOR_SIZE]; static unsigned char lastsector2[SECTOR_SIZE]; static int sec2cluster(int sec) { if ( sec < fat_bpb.firstdatasector ) { DEBUGF( "sec2cluster() - Bad sector number (%d)\n", sec); return -1; } return ((sec - fat_bpb.firstdatasector) / fat_bpb.bpb_secperclus) + 2; } static int cluster2sec(int cluster) { int max_cluster = fat_bpb.totalsectors - fat_bpb.firstdatasector / fat_bpb.bpb_secperclus + 1; if(cluster > max_cluster) { DEBUGF( "cluster2sec() - Bad cluster number (%d)\n", cluster); return -1; } return first_sector_of_cluster(cluster); } static int first_sector_of_cluster(int cluster) { return (cluster - 2) * fat_bpb.bpb_secperclus + fat_bpb.firstdatasector; } int fat_startsector(void) { return fat_bpb.startsector; } int fat_mount(int startsector) { unsigned char buf[SECTOR_SIZE]; int err; int datasec; int countofclusters; int i; for(i = 0;i < FAT_CACHE_SIZE;i++) { fat_cache[i].secnum = 8; /* We use a "safe" sector just in case */ fat_cache[i].inuse = false; fat_cache[i].dirty = false; } /* Read the sector */ err = ata_read_sectors(startsector,1,buf); if(err) { DEBUGF( "fat_mount() - Couldn't read BPB (error code %d)\n", err); return -1; } memset(&fat_bpb, 0, sizeof(struct bpb)); fat_bpb.startsector = startsector; strncpy(fat_bpb.bs_oemname, &buf[BS_OEMNAME], 8); fat_bpb.bs_oemname[8] = 0; fat_bpb.bpb_bytspersec = BYTES2INT16(buf,BPB_BYTSPERSEC); fat_bpb.bpb_secperclus = buf[BPB_SECPERCLUS]; fat_bpb.bpb_rsvdseccnt = BYTES2INT16(buf,BPB_RSVDSECCNT); fat_bpb.bpb_numfats = buf[BPB_NUMFATS]; fat_bpb.bpb_totsec16 = BYTES2INT16(buf,BPB_TOTSEC16); fat_bpb.bpb_media = buf[BPB_MEDIA]; fat_bpb.bpb_fatsz16 = BYTES2INT16(buf,BPB_FATSZ16); fat_bpb.bpb_fatsz32 = BYTES2INT32(buf,BPB_FATSZ32); fat_bpb.bpb_secpertrk = BYTES2INT16(buf,BPB_SECPERTRK); fat_bpb.bpb_numheads = BYTES2INT16(buf,BPB_NUMHEADS); fat_bpb.bpb_hiddsec = BYTES2INT32(buf,BPB_HIDDSEC); 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; fat_bpb.firstdatasector = fat_bpb.bpb_rsvdseccnt + fat_bpb.bpb_numfats * fat_bpb.fatsize; /* Determine FAT type */ datasec = fat_bpb.totalsectors - fat_bpb.firstdatasector; countofclusters = 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 ( countofclusters < 65525 ) #endif { DEBUGF("This is not FAT32. Go away!\n"); return -2; } fat_bpb.bpb_extflags = BYTES2INT16(buf,BPB_EXTFLAGS); fat_bpb.bpb_fsver = BYTES2INT16(buf,BPB_FSVER); fat_bpb.bpb_rootclus = BYTES2INT32(buf,BPB_ROOTCLUS); fat_bpb.bpb_fsinfo = BYTES2INT16(buf,BPB_FSINFO); fat_bpb.bpb_bkbootsec = BYTES2INT16(buf,BPB_BKBOOTSEC); fat_bpb.bs_drvnum = buf[BS_32_DRVNUM]; fat_bpb.bs_bootsig = buf[BS_32_BOOTSIG]; if(fat_bpb.bs_bootsig == 0x29) { fat_bpb.bs_volid = BYTES2INT32(buf,BS_32_VOLID); strncpy(fat_bpb.bs_vollab, &buf[BS_32_VOLLAB], 11); strncpy(fat_bpb.bs_filsystype, &buf[BS_32_FILSYSTYPE], 8); } if (bpb_is_sane() < 0) { DEBUGF( "fat_mount() - BPB is not sane\n"); return -3; } fat_bpb.rootdirsector = cluster2sec(fat_bpb.bpb_rootclus); /* Read the fsinfo sector */ err = ata_read_sectors(startsector + fat_bpb.bpb_fsinfo, 1, buf); if (err) { DEBUGF( "fat_mount() - Couldn't read FSInfo (error code %d)\n", err); return -4; } fat_bpb.fsinfo.freecount = BYTES2INT32(buf, FSINFO_FREECOUNT); fat_bpb.fsinfo.nextfree = BYTES2INT32(buf, FSINFO_NEXTFREE); LDEBUGF("Freecount: %x\n",fat_bpb.fsinfo.freecount); LDEBUGF("Nextfree: %x\n",fat_bpb.fsinfo.nextfree); return 0; } static int bpb_is_sane(void) { 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(fat_bpb.bpb_secperclus * fat_bpb.bpb_bytspersec > 32768) { DEBUGF( "bpb_is_sane() - Warning: cluster size is larger than 32K " "(%d * %d = %d)\n", fat_bpb.bpb_bytspersec, fat_bpb.bpb_secperclus, fat_bpb.bpb_bytspersec * fat_bpb.bpb_secperclus); } if (fat_bpb.bpb_rsvdseccnt != 32) { DEBUGF( "bpb_is_sane() - Warning: Reserved sectors is not 32 (%d)\n", fat_bpb.bpb_rsvdseccnt); } 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 -4; } 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%04x)\n", fat_bpb.fsinfo.freecount); return -5; } return 0; } static void *cache_fat_sector(int fatsector) { int secnum = fatsector + fat_bpb.bpb_rsvdseccnt; int cache_index = secnum & FAT_CACHE_MASK; /* Delete the cache entry if it isn't the sector we want */ if(fat_cache[cache_index].inuse && fat_cache[cache_index].secnum != secnum) { /* Write back if it is dirty */ if(fat_cache[cache_index].dirty) { if(ata_write_sectors(secnum + fat_bpb.startsector, 1, fat_cache_sectors[cache_index])) { panicf("cache_fat_sector() - Could not write sector %d\n", secnum); } } fat_cache[cache_index].secnum = 8; /* Normally an unused sector */ fat_cache[cache_index].dirty = false; fat_cache[cache_index].inuse = false; } /* Load the sector if it is not cached */ if(!fat_cache[cache_index].inuse) { if(ata_read_sectors(secnum + fat_bpb.startsector,1, fat_cache_sectors[cache_index])) { DEBUGF( "cache_fat_sector() - Could not read sector %d\n", secnum); return NULL; } fat_cache[cache_index].inuse = true; fat_cache[cache_index].secnum = secnum; } return fat_cache_sectors[cache_index]; } static int find_free_cluster(int startcluster) { int sector = startcluster / CLUSTERS_PER_FAT_SECTOR; int offset = startcluster % CLUSTERS_PER_FAT_SECTOR; int i; for (i = sector; i= FAT_EOF_MARK ) return 0; else return next_cluster; } static int flush_fat(void) { int i; int err; unsigned char *sec; int secnum; unsigned char fsinfo[SECTOR_SIZE]; unsigned int* intptr; LDEBUGF("flush_fat()\n"); for(i = 0;i < FAT_CACHE_SIZE;i++) { if(fat_cache[i].inuse && fat_cache[i].dirty) { secnum = fat_cache[i].secnum + fat_bpb.startsector; LDEBUGF("Flushing FAT sector %x\n", secnum); sec = fat_cache_sectors[i]; /* Write to the first FAT */ err = ata_write_sectors(secnum, 1, sec); if(err) { DEBUGF( "flush_fat() - Couldn't write" " sector (%d)\n", secnum); return -1; } if(fat_bpb.bpb_numfats > 1 ) { /* Write to the second FAT */ err = ata_write_sectors(secnum + fat_bpb.fatsize, 1, sec); if (err) { DEBUGF( "flush_fat() - Couldn't write" " sector (%d)\n", secnum + fat_bpb.fatsize); return -2; } } fat_cache[i].dirty = false; } } /* update fsinfo */ err = ata_read_sectors(fat_bpb.startsector + fat_bpb.bpb_fsinfo, 1,fsinfo); if (err) { DEBUGF( "flush_fat() - Couldn't read FSInfo (error code %d)\n", err); return -1; } intptr = (int*)&(fsinfo[FSINFO_FREECOUNT]); *intptr = SWAB32(fat_bpb.fsinfo.freecount); intptr = (int*)&(fsinfo[FSINFO_NEXTFREE]); *intptr = SWAB32(fat_bpb.fsinfo.nextfree); err = ata_write_sectors(fat_bpb.startsector + fat_bpb.bpb_fsinfo,1,fsinfo); if (err) { DEBUGF( "flush_fat() - Couldn't write FSInfo (error code %d)\n", err); return -1; } return 0; } static unsigned int getcurrdostime(unsigned short *dosdate, unsigned short *dostime, unsigned char *dostenth) { #if 0 struct tm *tm; unsigned long now = time(); tm = localtime(&tb.time); *dosdate = ((tm->tm_year - 80) << 9) | ((tm->tm_mon + 1) << 5) | (tm->tm_mday); *dostime = (tm->tm_hour << 11) | (tm->tm_min << 5) | (tm->tm_sec >> 1); *dostenth = (tm->tm_sec & 1) * 100 + tb.millitm / 10; #else *dosdate = 0; *dostime = 0; *dostenth = 0; #endif return 0; } static int add_dir_entry(struct fat_dir* dir, struct fat_direntry* de, struct fat_file* file) { unsigned char buf[SECTOR_SIZE]; unsigned char *eptr; int i; int err; int sec; int sec_cnt = 0; bool need_to_update_last_empty_marker = false; bool done = false; unsigned char firstbyte; int currdir = dir->startcluster; bool is_rootdir = (currdir == 0); LDEBUGF( "add_dir_entry(%x,%s,%x)\n", dir->startcluster, de->name, file->firstcluster); if (is_rootdir) sec = fat_bpb.rootdirsector; else sec = first_sector_of_cluster(currdir); while(!done) { if (sec_cnt >= fat_bpb.bpb_secperclus) { int oldcluster; if (!currdir) currdir = sec2cluster(fat_bpb.rootdirsector); oldcluster = currdir; /* We have reached the end of this cluster */ LDEBUGF("Moving to the next cluster...\n"); currdir = get_next_cluster(currdir); if (!currdir) { /* end of dir, add new cluster */ LDEBUGF("Adding cluster to dir\n"); currdir = find_free_cluster(fat_bpb.fsinfo.nextfree); if (!currdir) { currdir = find_free_cluster(0); if (!currdir) { DEBUGF("add_dir_entry(): Disk full!\n"); return -1; } } update_fat_entry(oldcluster, currdir); } LDEBUGF("new cluster is %x\n", currdir); sec = cluster2sec(currdir); } LDEBUGF("Reading sector %x...\n", sec); /* Read the next sector in the current dir */ err = ata_read_sectors(sec + fat_bpb.startsector,1,buf); if (err) { DEBUGF( "add_dir_entry() - Couldn't read dir sector" " (error code %d)\n", err); return -2; } if (need_to_update_last_empty_marker) { /* All we need to do is to set the first entry to 0 */ LDEBUGF("Clearing the first entry in sector %x\n", sec); buf[0] = 0; done = true; } else { /* Look for a free slot */ for (i = 0; i < SECTOR_SIZE; i += DIR_ENTRY_SIZE) { firstbyte = buf[i]; if (firstbyte == 0xe5 || firstbyte == 0) { LDEBUGF("Found free entry %d in sector %x\n", i/DIR_ENTRY_SIZE, sec); eptr = &buf[i]; memset(eptr, 0, DIR_ENTRY_SIZE); strncpy(&eptr[FATDIR_NAME], de->name, 11); eptr[FATDIR_ATTR] = de->attr; eptr[FATDIR_NTRES] = 0; /* remember where the dir entry is located */ file->dirsector = sec; file->direntry = i/DIR_ENTRY_SIZE; /* Advance the last_empty_entry marker */ if (firstbyte == 0) { i += DIR_ENTRY_SIZE; if (i < SECTOR_SIZE) { buf[i] = 0; /* We are done */ done = true; } else { /* We must fill in the first entry in the next sector */ need_to_update_last_empty_marker = true; } } else done = true; err = ata_write_sectors(sec + fat_bpb.startsector,1,buf); if (err) { DEBUGF( "add_dir_entry() - " " Couldn't write dir" " sector (error code %d)\n", err); return -3; } break; } } } sec++; sec_cnt++; } return 0; } unsigned char char2dos(unsigned char c) { switch(c) { case 0xe5: /* Special kanji character */ c = 0x05; break; case 0x22: case 0x2a: case 0x2b: case 0x2c: case 0x2e: case 0x3a: case 0x3b: case 0x3c: case 0x3d: case 0x3e: case 0x3f: case 0x5b: case 0x5c: case 0x5d: case 0x7c: /* Illegal name */ c = 0; break; default: if(c < 0x20) { /* Illegal name */ c = 0; } break; } return c; } static int create_dos_name(unsigned char *name, unsigned char *newname) { unsigned char n[12]; unsigned char c; int i; char *ext; strcpy(n, name); ext = strchr(n, '.'); if(ext) { *ext++ = 0; } /* The file name is either empty, or there was only an extension. In either case it is illegal. */ if(n[0] == 0) { return -2; } /* Name part */ for(i = 0;n[i] && (i < 8);i++) { c = char2dos(n[i]); if(c) { newname[i] = toupper(c); } } while(i < 8) { newname[i++] = ' '; } /* Extension part */ for (i = 0;ext && ext[i] && (i < 3);i++) { c = char2dos(ext[i]); if (c) { newname[8+i] = toupper(c); } } while(i < 3) { newname[8+i++] = ' '; } return 0; } static void update_dir_entry( struct fat_file* file, int size ) { unsigned char buf[SECTOR_SIZE]; int sector = file->dirsector + fat_bpb.startsector; unsigned char* entry = buf + file->direntry * DIR_ENTRY_SIZE; unsigned int* sizeptr; unsigned short* clusptr; int err; LDEBUGF("update_dir_entry(cluster:%x entry:%d size:%d)\n", file->firstcluster,file->direntry,size); if ( file->direntry >= (SECTOR_SIZE / DIR_ENTRY_SIZE) ) { DEBUGF("update_dir_entry(): Illegal entry %d!\n",file->direntry); return; } err = ata_read_sectors(sector, 1, buf); if (err) { DEBUGF( "update_dir_entry() - Couldn't read dir sector %d" " (error code %d)\n", sector, err); return; } if ( size == -1 ) { /* mark entry deleted */ entry[0] = 0xe5; } else { clusptr = (short*)(entry + FATDIR_FSTCLUSHI); *clusptr = SWAB16(file->firstcluster >> 16); clusptr = (short*)(entry + FATDIR_FSTCLUSLO); *clusptr = SWAB16(file->firstcluster & 0xffff); sizeptr = (int*)(entry + FATDIR_FILESIZE); *sizeptr = SWAB32(size); } err = ata_write_sectors(sector, 1, buf); if (err) { DEBUGF( "update_file_size() - Couldn't write dir sector %d" " (error code %d)\n", sector, err); return; } } static int parse_direntry(struct fat_direntry *de, unsigned char *buf) { int i=0,j=0; memset(de, 0, sizeof(struct fat_direntry)); de->attr = buf[FATDIR_ATTR]; de->crttimetenth = buf[FATDIR_CRTTIMETENTH]; de->crtdate = BYTES2INT16(buf,FATDIR_CRTDATE); de->crttime = BYTES2INT16(buf,FATDIR_CRTTIME); de->wrtdate = BYTES2INT16(buf,FATDIR_WRTDATE); de->wrttime = BYTES2INT16(buf,FATDIR_WRTTIME); de->filesize = BYTES2INT32(buf,FATDIR_FILESIZE); de->firstcluster = BYTES2INT16(buf,FATDIR_FSTCLUSLO) | (BYTES2INT16(buf,FATDIR_FSTCLUSHI) << 16); /* fix the name */ for (i=0; (i<8) && (buf[FATDIR_NAME+i] != ' '); i++) de->name[j++] = buf[FATDIR_NAME+i]; if ( buf[FATDIR_NAME+8] != ' ' ) { de->name[j++] = '.'; for (i=8; (i<11) && (buf[FATDIR_NAME+i] != ' '); i++) de->name[j++] = buf[FATDIR_NAME+i]; } return 1; } int fat_open(unsigned int startcluster, struct fat_file *file, struct fat_dir* dir) { file->firstcluster = startcluster; file->lastcluster = startcluster; file->lastsector = cluster2sec(startcluster); file->sectornum = 0; /* remember where the file's dir entry is located */ file->dirsector = dir->cached_sec; file->direntry = (dir->entry % DIR_ENTRIES_PER_SECTOR) - 1; LDEBUGF("fat_open: entry %d\n",file->direntry); return 0; } int fat_create_file(char* name, struct fat_file* file, struct fat_dir* dir) { struct fat_direntry de; int err; LDEBUGF("fat_create_file(\"%s\",%x,%x)\n",name,file,dir); memset(&de, 0, sizeof(struct fat_direntry)); if (create_dos_name(name, de.name) < 0) { DEBUGF( "fat_create_file() - Illegal file name (%s)\n", name); return -1; } getcurrdostime(&de.crtdate, &de.crttime, &de.crttimetenth); de.wrtdate = de.crtdate; de.wrttime = de.crttime; de.filesize = 0; err = add_dir_entry(dir, &de, file); if (!err) { file->firstcluster = 0; file->lastcluster = 0; file->lastsector = 0; file->sectornum = 0; } return err; } int fat_closewrite(struct fat_file *file, int size) { int next, last = file->lastcluster; int endcluster = last; LDEBUGF("fat_closewrite()\n"); last = get_next_cluster(last); while ( last && last != FAT_EOF_MARK ) { next = get_next_cluster(last); update_fat_entry(last,0); last = next; } update_fat_entry(endcluster, FAT_EOF_MARK); update_dir_entry(file, size); flush_fat(); return 0; } int fat_remove(struct fat_file* file) { int next, last = file->firstcluster; LDEBUGF("fat_remove(%x)\n",last); while ( last != FAT_EOF_MARK ) { LDEBUGF("Freeing cluster %x\n",last); next = get_next_cluster(last); update_fat_entry(last,0); last = next; } update_dir_entry(file, -1); return 0; } int fat_readwrite( struct fat_file *file, int sectorcount, void* buf, bool write ) { int cluster = file->lastcluster; int sector = file->lastsector; int numsec = file->sectornum; int first=0, last=0; int err, i; LDEBUGF( "fat_readwrite(file:%x,count:%d,buf:%x,%s)\n", cluster,sectorcount,buf,write?"write":"read"); LDEBUGF( "fat_readwrite: c=%x s=%x n=%d\n", cluster,sector,numsec); if ( sector == -1 ) return 0; if ( write && !cluster) { /* new file */ cluster = find_free_cluster(fat_bpb.fsinfo.nextfree); if (!cluster) { cluster = find_free_cluster(0); if (!cluster) { DEBUGF("fat_readwrite(): Disk full!\n"); return -3; } } file->firstcluster = cluster; sector = cluster2sec(cluster); if (sector<0) return -1; } /* find sequential sectors and read/write them all at once */ for (i=0; i=0; i++ ) { if ( numsec >= fat_bpb.bpb_secperclus ) { int oldcluster = cluster; cluster = get_next_cluster(cluster); if (!cluster) { if ( write ) { /* writing past end-of-file, find a new free cluster to use. */ cluster = find_free_cluster(oldcluster+1); if (!cluster) { /* no free cluster found after last, search from beginning */ cluster = find_free_cluster(0); if (!cluster) { /* no free clusters. disk is full. */ sector = -1; DEBUGF("fat_readwrite(): Disk full!\n"); } } if ( cluster ) update_fat_entry(oldcluster, cluster); } else { /* reading past end-of-file */ sector = -1; } } if (cluster) { sector = cluster2sec(cluster); LDEBUGF("cluster2sec(%x) == %x\n",cluster,sector); if (sector<0) return -1; numsec=0; } } else sector++; numsec++; if (!first) first = sector; if (!last) last = sector; if ( (sector != last+1) || /* not sequential any more? */ (i == sectorcount-1) || /* last sector requested? */ (last-first+1 == 256) ) { /* max 256 sectors per ata request */ int count = last-first+1; if (write) err = ata_write_sectors(first + fat_bpb.startsector, count, buf); else err = ata_read_sectors(first + fat_bpb.startsector, count, buf); if (err) { DEBUGF( "fat_readwrite() - Couldn't read sector %d" " (error code %d)\n", sector,err); return -2; } ((char*)buf) += count * SECTOR_SIZE; first = sector; } last = sector; } file->lastcluster = cluster; file->lastsector = sector; file->sectornum = numsec; return sectorcount; } int fat_seek(struct fat_file *file, int seeksector ) { int cluster = file->firstcluster; int sector = cluster2sec(cluster); int numsec = 0; int i; if ( seeksector ) { for (i=0; i= fat_bpb.bpb_secperclus ) { cluster = get_next_cluster(cluster); if (!cluster) { /* end of file */ if (i == (seeksector-1)) { /* seeksector is last sector in file */ sector = -1; break; } else /* attempting to seek beyond end of file */ return -1; } sector = cluster2sec(cluster); if (sector<0) return -2; numsec=0; } else sector++; } } file->lastcluster = cluster; file->lastsector = sector; file->sectornum = numsec; return 0; } int fat_opendir(struct fat_dir *dir, unsigned int startcluster) { int is_rootdir = (startcluster == 0); unsigned int sec; int err; if(is_rootdir) { sec = fat_bpb.rootdirsector; } else { sec = first_sector_of_cluster(startcluster); } /* Read the first sector in the current dir */ err = ata_read_sectors(sec + fat_bpb.startsector,1,dir->cached_buf); if(err) { DEBUGF( "fat_opendir() - Couldn't read dir sector" " (error code %d)\n", err); return -1; } dir->entry = 0; dir->cached_sec = sec; dir->num_sec = 0; dir->startcluster = startcluster; return 0; } int fat_getnext(struct fat_dir *dir, struct fat_direntry *entry) { bool done = false; int i; int err; unsigned char firstbyte; int longarray[20]; int longs=0; int sectoridx=0; while(!done) { for (i = dir->entry; i < SECTOR_SIZE/DIR_ENTRY_SIZE; i++) { firstbyte = dir->cached_buf[i*DIR_ENTRY_SIZE]; if (firstbyte == 0xe5) { /* free entry */ sectoridx = 0; continue; } if (firstbyte == 0) { /* last entry */ entry->name[0] = 0; return 0; } /* longname entry? */ if ( ( dir->cached_buf[i*DIR_ENTRY_SIZE + FATDIR_ATTR] & FAT_ATTR_LONG_NAME_MASK ) == FAT_ATTR_LONG_NAME ) { longarray[longs++] = i*DIR_ENTRY_SIZE + sectoridx; } else { if ( parse_direntry(entry, &dir->cached_buf[i*DIR_ENTRY_SIZE]) ) { /* don't return volume id entry */ if ( entry->attr == FAT_ATTR_VOLUME_ID ) continue; /* replace shortname with longname? */ if ( longs ) { int j,k,l=0; /* iterate backwards through the dir entries */ for (j=longs-1; j>=0; j--) { unsigned char* ptr = dir->cached_buf; int index = longarray[j]; /* current or cached sector? */ if ( sectoridx >= SECTOR_SIZE ) { if ( sectoridx >= SECTOR_SIZE*2 ) { if ( ( index >= SECTOR_SIZE ) && ( index < SECTOR_SIZE*2 )) ptr = lastsector; else ptr = lastsector2; } else { if ( index < SECTOR_SIZE ) ptr = lastsector; } index &= SECTOR_SIZE-1; } /* names are stored in unicode, but we only grab the low byte (iso8859-1). */ for (k=0; k<5; k++) entry->name[l++] = ptr[index + k*2 + 1]; for (k=0; k<6; k++) entry->name[l++] = ptr[index + k*2 + 14]; for (k=0; k<2; k++) entry->name[l++] = ptr[index + k*2 + 28]; } entry->name[l]=0; } done = true; sectoridx = 0; break; } } } /* save this sector, for longname use */ if ( sectoridx ) memcpy( lastsector2, dir->cached_buf, SECTOR_SIZE ); else memcpy( lastsector, dir->cached_buf, SECTOR_SIZE ); sectoridx += SECTOR_SIZE; /* Next sector? */ if (i < SECTOR_SIZE / DIR_ENTRY_SIZE) { i++; } else { dir->num_sec++; /* Do we need to advance one cluster? */ if (dir->num_sec < fat_bpb.bpb_secperclus) { dir->cached_sec++; } else { int cluster = sec2cluster(dir->cached_sec); if ( cluster < 0 ) { DEBUGF("sec2cluster failed\n"); return -1; } dir->num_sec = 0; cluster = get_next_cluster( cluster ); if (!cluster) { DEBUGF("End of cluster chain.\n"); return -2; } dir->cached_sec = cluster2sec(cluster); if ( dir->cached_sec < 0 ) { DEBUGF("Invalid cluster: %d\n",cluster); return -3; } } /* Read the next sector */ err = ata_read_sectors(dir->cached_sec + fat_bpb.startsector, 1, dir->cached_buf); if (err) { DEBUGF( "fat_getnext() - Couldn't read dir sector" " (error code %d)\n", err); return -4; } i = 0; } dir->entry = i; } return 0; } /* ----------------------------------------------------------------- * local variables: * eval: (load-file "../rockbox-mode.el") * end: */