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Cluster chaining now works.

Browse source 
Moved all implementation details in .h to .c file.
Changed all printfs to DEBUG macros.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@256 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Björn Stenberg 2002-04-27 01:25:22 +00:00
parent ccd3d0a6eb
commit 5661b2332f
2 changed files with 295 additions and 362 deletions
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539
firmware/drivers/fat.c
View file

@ -25,8 +25,6 @@
#include <time.h> #include <time.h>
#include <sys/timeb.h> #include <sys/timeb.h>
#define BLOCK_SIZE 512
#include "fat.h" #include "fat.h"
#include "ata.h" #include "ata.h"
@ -41,41 +39,100 @@
#define NUM_RESERVED_SECTORS 1 #define NUM_RESERVED_SECTORS 1
#define NUM_BLOCKS 10000 #define NUM_BLOCKS 10000
struct dsksz2secperclus #define FATTYPE_FAT12 0
{ #define FATTYPE_FAT16 1
unsigned int disk_size; #define FATTYPE_FAT32 2
unsigned int sec_per_cluster;
/* 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
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
int fat_num_rootdir_sectors(struct bpb *bpb); static int first_sector_of_cluster(struct bpb *bpb, unsigned int cluster);
int fat_first_sector_of_cluster(struct bpb *bpb, unsigned int cluster); static int get_bpb(struct bpb *bpb);
int fat_get_fatsize(struct bpb* bpb); static int bpb_is_sane(struct bpb *bpb);
int fat_get_totsec(struct bpb* bpb); static int flush_fat(struct bpb *bpb);
int fat_get_rootdir_sector(struct bpb *bpb); static void *cache_fat_sector(struct bpb *bpb, int secnum);
int fat_first_data_sector(struct bpb* bpb); static int update_entry(struct bpb *bpb, int entry, unsigned int val);
int fat_get_bpb(struct bpb *bpb); static unsigned int getcurrdostime(unsigned short *dosdate,
int fat_bpb_is_sane(struct bpb *bpb); unsigned short *dostime,
int fat_create_fat(struct bpb* bpb); unsigned char *dostenth);
int fat_dbg_read_block(char *name, unsigned char *buf); static int create_dos_name(unsigned char *name, unsigned char *newname);
int fat_flush_fat(struct bpb *bpb);
unsigned char *fat_cache_fat_sector(struct bpb *bpb, int secnum);
int fat_update_entry(struct bpb *bpb, int entry, unsigned int val);
unsigned int fat_getcurrdostime(unsigned short *dosdate,
unsigned short *dostime,
unsigned char *dostenth);
int fat_create_dos_name(unsigned char *name, unsigned char *newname);
int fat_create_file(struct bpb *bpb, unsigned int currdir, char *name);
unsigned char *fat_cache[256];
int fat_cache_dirty[256];
char current_directory[256] = "\\";
struct bpb *global_bpb;
struct disk_info di;
static unsigned char *fat_cache[256];
static int fat_cache_dirty[256];
#ifdef TEST_FAT #ifdef TEST_FAT
#include "debug.h" #include "debug.h"
#define DEBUG(x) printf(x)
#define DEBUG1(x,y) printf(x,y)
#define DEBUG2(x,y1,y2) printf(x,y1,y2)
#define DEBUG3(x,y1,y2,y3) printf(x,y1,y2,y3)
int main(int argc, char *argv[]) int main(int argc, char *argv[])
{ {
@ -84,101 +141,56 @@ int main(int argc, char *argv[])
memset(fat_cache, 0, sizeof(fat_cache)); memset(fat_cache, 0, sizeof(fat_cache));
memset(fat_cache_dirty, 0, sizeof(fat_cache_dirty)); memset(fat_cache_dirty, 0, sizeof(fat_cache_dirty));
di.num_sectors = NUM_BLOCKS;
di.sec_per_track = 40;
di.num_heads = 250;
di.hidden_sectors = 0;
if(ata_init()) if(ata_init())
printf("*** Warning! The disk is uninitialized\n"); DEBUG("*** Warning! The disk is uninitialized\n");
else else
fat_get_bpb(&bpb); get_bpb(&bpb);
global_bpb = &bpb;
dbg_console(&bpb); dbg_console(&bpb);
return 0; return 0;
} }
#else
#define DEBUG(x);
#define DEBUG1(x,y);
#define DEBUG2(x,y1,y2);
#define DEBUG3(x,y1,y2,y3);
#endif #endif
int fat_sec2cluster(struct bpb *bpb, unsigned int sec) static int sec2cluster(struct bpb *bpb, unsigned int sec)
{ {
int first_sec = fat_first_data_sector(bpb); if ( sec < bpb->firstdatasector )
if(sec < first_sec)
{ {
fprintf(stderr, "fat_sec2cluster() - Bad sector number (%d)\n", sec); DEBUG1( "sec2cluster() - Bad sector number (%d)\n", sec);
return -1; return -1;
} }
return ((sec - first_sec) / bpb->bpb_secperclus) + 2; return ((sec - bpb->firstdatasector) / bpb->bpb_secperclus) + 2;
} }
int fat_cluster2sec(struct bpb *bpb, unsigned int cluster) static int cluster2sec(struct bpb *bpb, unsigned int cluster)
{ {
int max_cluster = (fat_get_totsec(bpb) - fat_first_data_sector(bpb)) / int max_cluster = bpb->totalsectors -
bpb->bpb_secperclus + 1; bpb->firstdatasector / bpb->bpb_secperclus + 1;
if(cluster > max_cluster) if(cluster > max_cluster)
{ {
fprintf(stderr, "fat_cluster2sec() - Bad cluster number (%d)\n", DEBUG1( "cluster2sec() - Bad cluster number (%d)\n",
cluster); cluster);
return -1; return -1;
} }
return fat_first_sector_of_cluster(bpb, cluster); return first_sector_of_cluster(bpb, cluster);
} }
int fat_first_sector_of_cluster(struct bpb *bpb, unsigned int cluster) static int first_sector_of_cluster(struct bpb *bpb, unsigned int cluster)
{ {
return (cluster - 2) * bpb->bpb_secperclus + fat_first_data_sector(bpb); return (cluster - 2) * bpb->bpb_secperclus + bpb->firstdatasector;
} }
int fat_num_rootdir_sectors(struct bpb *bpb) static int get_bpb(struct bpb *bpb)
{
return ((bpb->bpb_rootentcnt * 32) + (bpb->bpb_bytspersec - 1)) /
bpb->bpb_bytspersec;
}
int fat_get_fatsize(struct bpb* bpb)
{
if(bpb->bpb_fatsz16 != 0)
return bpb->bpb_fatsz16;
else
return bpb->bpb_fatsz32;
}
int fat_get_totsec(struct bpb* bpb)
{
if(bpb->bpb_totsec16 != 0)
return bpb->bpb_totsec16;
else
return bpb->bpb_totsec32;
}
int fat_get_rootdir_sector(struct bpb *bpb)
{
return bpb->bpb_rootclus;
}
int fat_first_data_sector(struct bpb* bpb)
{
int fatsz;
int rootdirsectors;
fatsz = fat_get_fatsize(bpb);
rootdirsectors = fat_num_rootdir_sectors(bpb);
return bpb->bpb_rsvdseccnt + bpb->bpb_numfats * fatsz + rootdirsectors;
}
int fat_get_bpb(struct bpb *bpb)
{ {
unsigned char buf[BLOCK_SIZE]; unsigned char buf[BLOCK_SIZE];
int err; int err;
int fatsz;
int rootdirsectors;
int totsec;
int datasec; int datasec;
int countofclusters; int countofclusters;
@ -186,7 +198,7 @@ int fat_get_bpb(struct bpb *bpb)
err = ata_read_sectors(0,1,buf); err = ata_read_sectors(0,1,buf);
if(err) if(err)
{ {
fprintf(stderr, "fat_get_bpb() - Couldn't read BPB (error code %i)\n", DEBUG1( "get_bpb() - Couldn't read BPB (error code %i)\n",
err); err);
return -1; return -1;
} }
@ -204,158 +216,129 @@ int fat_get_bpb(struct bpb *bpb)
bpb->bpb_totsec16 = BYTES2INT16(buf,BPB_TOTSEC16); bpb->bpb_totsec16 = BYTES2INT16(buf,BPB_TOTSEC16);
bpb->bpb_media = buf[BPB_MEDIA]; bpb->bpb_media = buf[BPB_MEDIA];
bpb->bpb_fatsz16 = BYTES2INT16(buf,BPB_FATSZ16); bpb->bpb_fatsz16 = BYTES2INT16(buf,BPB_FATSZ16);
bpb->bpb_fatsz32 = BYTES2INT32(buf,BPB_FATSZ32);
bpb->bpb_secpertrk = BYTES2INT16(buf,BPB_SECPERTRK); bpb->bpb_secpertrk = BYTES2INT16(buf,BPB_SECPERTRK);
bpb->bpb_numheads = BYTES2INT16(buf,BPB_NUMHEADS); bpb->bpb_numheads = BYTES2INT16(buf,BPB_NUMHEADS);
bpb->bpb_hiddsec = BYTES2INT32(buf,BPB_HIDDSEC); bpb->bpb_hiddsec = BYTES2INT32(buf,BPB_HIDDSEC);
bpb->bpb_totsec32 = BYTES2INT32(buf,BPB_TOTSEC32); bpb->bpb_totsec32 = BYTES2INT32(buf,BPB_TOTSEC32);
bpb->bs_drvnum = buf[BS_DRVNUM];
bpb->bs_bootsig = buf[BS_BOOTSIG];
bpb->bpb_fatsz32 = BYTES2INT32(buf,BPB_FATSZ32);
bpb->last_word = BYTES2INT16(buf,BPB_LAST_WORD); bpb->last_word = BYTES2INT16(buf,BPB_LAST_WORD);
/* calculate a few commonly used values */
if (bpb->bpb_fatsz16 != 0)
bpb->fatsize = bpb->bpb_fatsz16;
else
bpb->fatsize = bpb->bpb_fatsz32;
if (bpb->bpb_totsec16 != 0)
bpb->totalsectors = bpb->bpb_totsec16;
else
bpb->totalsectors = bpb->bpb_totsec32;
bpb->firstdatasector = bpb->bpb_rsvdseccnt +
bpb->bpb_numfats * bpb->fatsize;
/* Determine FAT type */
datasec = bpb->totalsectors - bpb->firstdatasector;
countofclusters = datasec / 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 ( bpb->bpb_fatsz16 )
#else
if ( countofclusters < 65525 )
#endif
{
DEBUG("This is not FAT32. Go away!\n");
return -1;
}
bpb->bpb_extflags = BYTES2INT16(buf,BPB_EXTFLAGS);
bpb->bpb_fsver = BYTES2INT16(buf,BPB_FSVER);
bpb->bpb_rootclus = BYTES2INT32(buf,BPB_ROOTCLUS);
bpb->bpb_fsinfo = BYTES2INT16(buf,BPB_FSINFO);
bpb->bpb_bkbootsec = BYTES2INT16(buf,BPB_BKBOOTSEC);
bpb->bs_drvnum = buf[BS_32_DRVNUM];
bpb->bs_bootsig = buf[BS_32_BOOTSIG];
if(bpb->bs_bootsig == 0x29) if(bpb->bs_bootsig == 0x29)
{ {
bpb->bs_volid = BYTES2INT32(buf,BS_VOLID); bpb->bs_volid = BYTES2INT32(buf,BS_32_VOLID);
strncpy(bpb->bs_vollab, &buf[BS_VOLLAB], 11); strncpy(bpb->bs_vollab, &buf[BS_32_VOLLAB], 11);
strncpy(bpb->bs_filsystype, &buf[BS_FILSYSTYPE], 8); strncpy(bpb->bs_filsystype, &buf[BS_32_FILSYSTYPE], 8);
} }
/* Determine FAT type */ if (bpb_is_sane(bpb) < 0)
fatsz = fat_get_fatsize(bpb);
if (bpb->bpb_totsec16 != 0)
totsec = bpb->bpb_totsec16;
else
totsec = bpb->bpb_totsec32;
rootdirsectors = fat_num_rootdir_sectors(bpb);
datasec = totsec - (bpb->bpb_rsvdseccnt + bpb->bpb_numfats * fatsz +
rootdirsectors);
countofclusters = datasec / bpb->bpb_secperclus;
/* Determining FAT type:
This is the "proper way" to do it:
if (countofclusters < 4085)
fat12
else
if (countofclusters < 65525)
fat16
else
fat32
*/
/*
This is the "real world way" to do it
(since not all FAT32 partitions have >65524 clusters)
*/
if ( bpb->bpb_fatsz16 ) {
printf("This is not FAT32. Go away!\n");
return -1;
}
if (fat_bpb_is_sane(bpb) < 0)
{ {
fprintf(stderr, "fat_get_bpb() - BPB is not sane\n"); DEBUG( "get_bpb() - BPB is not sane\n");
return -1; return -1;
} }
bpb->rootdirsector = cluster2sec(bpb,bpb->bpb_rootclus);
return 0; return 0;
} }
int fat_bpb_is_sane(struct bpb *bpb) static int bpb_is_sane(struct bpb *bpb)
{ {
if(bpb->bpb_bytspersec != 512) if(bpb->bpb_bytspersec != 512)
{ {
fprintf(stderr, DEBUG1( "bpb_is_sane() - Warning: sector size is not 512 (%i)\n",
"fat_bpb_is_sane() - Warning: sector size is not 512 (%i)\n",
bpb->bpb_bytspersec); bpb->bpb_bytspersec);
} }
if(bpb->bpb_secperclus * bpb->bpb_bytspersec > 32768) if(bpb->bpb_secperclus * bpb->bpb_bytspersec > 32768)
{ {
fprintf(stderr, DEBUG3( "bpb_is_sane() - Warning: cluster size is larger than 32K "
"fat_bpb_is_sane() - Warning: cluster size is larger than 32K "
"(%i * %i = %i)\n", "(%i * %i = %i)\n",
bpb->bpb_bytspersec, bpb->bpb_secperclus, bpb->bpb_bytspersec, bpb->bpb_secperclus,
bpb->bpb_bytspersec * bpb->bpb_secperclus); bpb->bpb_bytspersec * bpb->bpb_secperclus);
} }
if(bpb->bpb_rsvdseccnt != 1) if(bpb->bpb_rsvdseccnt != 1)
{ {
fprintf(stderr, DEBUG1( "bpb_is_sane() - Warning: Reserved sectors is not 1 (%i)\n",
"fat_bpb_is_sane() - Warning: Reserved sectors is not 1 (%i)\n",
bpb->bpb_rsvdseccnt); bpb->bpb_rsvdseccnt);
} }
if(bpb->bpb_numfats != 2) if(bpb->bpb_numfats != 2)
{ {
fprintf(stderr, DEBUG1( "bpb_is_sane() - Warning: NumFATS is not 2 (%i)\n",
"fat_bpb_is_sane() - Warning: NumFATS is not 2 (%i)\n",
bpb->bpb_numfats); bpb->bpb_numfats);
} }
if(bpb->bpb_rootentcnt != 512) if(bpb->bpb_rootentcnt != 512)
{ {
fprintf(stderr, DEBUG1( "bpb_is_sane() - Warning: RootEntCnt is not 512 (%i)\n",
"fat_bpb_is_sane() - Warning: RootEntCnt is not 512 (%i)\n",
bpb->bpb_rootentcnt); bpb->bpb_rootentcnt);
} }
if(bpb->bpb_totsec16 < 200) if(bpb->bpb_totsec16 < 200)
{ {
if(bpb->bpb_totsec16 == 0) if(bpb->bpb_totsec16 == 0)
{ {
fprintf(stderr, "fat_bpb_is_sane() - Error: TotSec16 is 0\n"); DEBUG( "bpb_is_sane() - Error: TotSec16 is 0\n");
return -1; return -1;
} }
else else
{ {
fprintf(stderr, DEBUG1( "bpb_is_sane() - Warning: TotSec16 "
"fat_bpb_is_sane() - Warning: TotSec16 "
"is quite small (%i)\n", "is quite small (%i)\n",
bpb->bpb_totsec16); bpb->bpb_totsec16);
} }
} }
if(bpb->bpb_media != 0xf0 && bpb->bpb_media < 0xf8) if(bpb->bpb_media != 0xf0 && bpb->bpb_media < 0xf8)
{ {
fprintf(stderr, DEBUG1( "bpb_is_sane() - Warning: Non-standard "
"fat_bpb_is_sane() - Warning: Non-standard "
"media type (0x%02x)\n", "media type (0x%02x)\n",
bpb->bpb_media); bpb->bpb_media);
} }
if(bpb->last_word != 0xaa55) if(bpb->last_word != 0xaa55)
{ {
fprintf(stderr, "fat_bpb_is_sane() - Error: Last word is not " DEBUG1( "bpb_is_sane() - Error: Last word is not "
"0xaa55 (0x%04x)\n", bpb->last_word); "0xaa55 (0x%04x)\n", bpb->last_word);
return -1; return -1;
} }
return 0; return 0;
} }
int fat_dbg_read_block(char *name, unsigned char *buf) static void *cache_fat_sector(struct bpb *bpb, int secnum)
{
FILE *f;
f = fopen(name, "rb");
if(f)
{
if(fread(buf, 1, 512, f) != 512)
{
fprintf(stderr, "Could not read file \"%s\"\n", name);
fclose(f);
return -1;
}
/* Now write the sector to disk */
ata_write_sectors(0,1,buf);
fclose(f);
}
else
{
fprintf(stderr, "Could not open file \"%s\"\n", name);
return -1;
}
return 0;
}
unsigned char *fat_cache_fat_sector(struct bpb *bpb, int secnum)
{ {
unsigned char *sec; unsigned char *sec;
@ -366,12 +349,12 @@ unsigned char *fat_cache_fat_sector(struct bpb *bpb, int secnum)
sec = malloc(bpb->bpb_bytspersec); sec = malloc(bpb->bpb_bytspersec);
if(!sec) if(!sec)
{ {
fprintf(stderr, "fat_cache_fat_sector() - Out of memory\n"); DEBUG( "cache_fat_sector() - Out of memory\n");
return NULL; return NULL;
} }
if(ata_read_sectors(secnum + bpb->bpb_rsvdseccnt,1,sec)) if(ata_read_sectors(secnum,1,sec))
{ {
fprintf(stderr, "fat_cache_fat_sector() - Could" DEBUG1( "cache_fat_sector() - Could"
" not read sector %d\n", " not read sector %d\n",
secnum); secnum);
free(sec); free(sec);
@ -382,66 +365,72 @@ unsigned char *fat_cache_fat_sector(struct bpb *bpb, int secnum)
return sec; return sec;
} }
int fat_update_entry(struct bpb *bpb, int entry, unsigned int val) static int update_entry(struct bpb *bpb, int entry, unsigned int val)
{ {
unsigned char *sec; unsigned long *sec;
int fatsz;
int fatoffset; int fatoffset;
int thisfatsecnum; int thisfatsecnum;
int thisfatentoffset; int thisfatentoffset;
unsigned int tmp;
fatsz = fat_get_fatsize(bpb);
fatoffset = entry * 4; fatoffset = entry * 4;
thisfatsecnum = fatoffset / bpb->bpb_bytspersec; thisfatsecnum = fatoffset / bpb->bpb_bytspersec + bpb->bpb_rsvdseccnt;
thisfatentoffset = fatoffset % bpb->bpb_bytspersec; thisfatentoffset = fatoffset % bpb->bpb_bytspersec;
sec = fat_cache_fat_sector(bpb, thisfatsecnum);
/* Load the sector if it is not cached */ /* Load the sector if it is not cached */
sec = cache_fat_sector(bpb, thisfatsecnum);
if(!sec) if(!sec)
{ {
fprintf(stderr, "fat_update_entry() - Could not cache sector %d\n", DEBUG1( "update_entry() - Could not cache sector %d\n",
thisfatsecnum); thisfatsecnum);
return -1; return -1;
} }
fat_cache_dirty[thisfatsecnum] = 1; fat_cache_dirty[thisfatsecnum] = 1;
tmp = *(unsigned short *)(&sec[thisfatentoffset]) & 0xf000000; /* don't change top 4 bits */
val = tmp | (val & 0x0fffffff); sec[thisfatentoffset/sizeof(int)] &= 0xf000000;
*(unsigned short *)(&sec[thisfatentoffset]) = val; sec[thisfatentoffset/sizeof(int)] |= val & 0x0fffffff;
return 0; return 0;
} }
int fat_read_entry(struct bpb *bpb, int entry) static int read_entry(struct bpb *bpb, int entry)
{ {
unsigned char *sec; unsigned long *sec;
int fatsz;
int fatoffset; int fatoffset;
int thisfatsecnum; int thisfatsecnum;
int thisfatentoffset; int thisfatentoffset;
int val = -1; int val = -1;
fatsz = fat_get_fatsize(bpb);
fatoffset = entry * 4; fatoffset = entry * 4;
thisfatsecnum = fatoffset / bpb->bpb_bytspersec; thisfatsecnum = fatoffset / bpb->bpb_bytspersec + bpb->bpb_rsvdseccnt;
thisfatentoffset = fatoffset % bpb->bpb_bytspersec; thisfatentoffset = fatoffset % bpb->bpb_bytspersec;
sec = fat_cache_fat_sector(bpb, thisfatsecnum);
/* Load the sector if it is not cached */ /* Load the sector if it is not cached */
sec = cache_fat_sector(bpb, thisfatsecnum);
if(!sec) if(!sec)
{ {
fprintf(stderr, "fat_update_entry() - Could not cache sector %d\n", DEBUG1( "update_entry() - Could not cache sector %d\n",
thisfatsecnum); thisfatsecnum);
return -1; return -1;
} }
val = *(unsigned int *)(&sec[thisfatentoffset]); val = sec[thisfatentoffset/sizeof(int)];
return val; return val;
} }
int fat_flush_fat(struct bpb *bpb) static int get_next_cluster(struct bpb *bpb, unsigned int cluster)
{
int next_cluster = read_entry(bpb, cluster);
/* is this last cluster in chain? */
if ( next_cluster >= 0x0ffffff8 )
return 0;
else
return next_cluster;
}
static int flush_fat(struct bpb *bpb)
{ {
int i; int i;
int err; int err;
@ -450,25 +439,25 @@ int fat_flush_fat(struct bpb *bpb)
unsigned short d, t; unsigned short d, t;
char m; char m;
fatsz = fat_get_fatsize(bpb); fatsz = bpb->fatsize;
for(i = 0;i < 256;i++) for(i = 0;i < 256;i++)
{ {
if(fat_cache[i] && fat_cache_dirty[i]) if(fat_cache[i] && fat_cache_dirty[i])
{ {
printf("Flushing FAT sector %d\n", i); DEBUG1("Flushing FAT sector %d\n", i);
sec = fat_cache[i]; sec = fat_cache[i];
err = ata_write_sectors(i + bpb->bpb_rsvdseccnt,1,sec); err = ata_write_sectors(i + bpb->bpb_rsvdseccnt,1,sec);
if(err) if(err)
{ {
fprintf(stderr, "fat_flush_fat() - Couldn't write" DEBUG1( "flush_fat() - Couldn't write"
" sector (%d)\n", i + bpb->bpb_rsvdseccnt); " sector (%d)\n", i + bpb->bpb_rsvdseccnt);
return -1; return -1;
} }
err = ata_write_sectors(i + bpb->bpb_rsvdseccnt + fatsz,1,sec); err = ata_write_sectors(i + bpb->bpb_rsvdseccnt + fatsz,1,sec);
if(err) if(err)
{ {
fprintf(stderr, "fat_flush_fat() - Couldn't write" DEBUG1( "flush_fat() - Couldn't write"
" sector (%d)\n", i + bpb->bpb_rsvdseccnt + fatsz); " sector (%d)\n", i + bpb->bpb_rsvdseccnt + fatsz);
return -1; return -1;
} }
@ -476,11 +465,11 @@ int fat_flush_fat(struct bpb *bpb)
} }
} }
fat_getcurrdostime(&d, &t, &m); getcurrdostime(&d, &t, &m);
return 0; return 0;
} }
unsigned int fat_getcurrdostime(unsigned short *dosdate, unsigned int getcurrdostime(unsigned short *dosdate,
unsigned short *dostime, unsigned short *dostime,
unsigned char *dostenth) unsigned char *dostenth)
{ {
@ -502,19 +491,9 @@ unsigned int fat_getcurrdostime(unsigned short *dosdate,
return 0; return 0;
} }
int fat_get_next_cluster(struct bpb *bpb, unsigned int cluster) static int add_dir_entry(struct bpb *bpb,
{ unsigned int currdir,
int next_cluster = fat_read_entry(bpb, cluster); struct fat_direntry *de)
/* is this last cluster in chain? */
if ( next_cluster >= 0x0ffffff8 )
return 0;
else
return next_cluster;
}
int fat_add_dir_entry(struct bpb *bpb, unsigned int currdir,
struct fat_direntry *de)
{ {
unsigned char buf[BLOCK_SIZE]; unsigned char buf[BLOCK_SIZE];
unsigned char *eptr; unsigned char *eptr;
@ -529,11 +508,11 @@ int fat_add_dir_entry(struct bpb *bpb, unsigned int currdir,
if(is_rootdir) if(is_rootdir)
{ {
sec = fat_get_rootdir_sector(bpb); sec = bpb->rootdirsector;
} }
else else
{ {
sec = fat_first_sector_of_cluster(bpb, currdir); sec = first_sector_of_cluster(bpb, currdir);
} }
sec_cnt = 0; sec_cnt = 0;
@ -554,7 +533,7 @@ int fat_add_dir_entry(struct bpb *bpb, unsigned int currdir,
} }
else else
{ {
fprintf(stderr, "fat_add_dir_entry() -" DEBUG( "add_dir_entry() -"
" Root dir is full\n"); " Root dir is full\n");
return -1; return -1;
} }
@ -565,9 +544,9 @@ int fat_add_dir_entry(struct bpb *bpb, unsigned int currdir,
if(sec_cnt >= bpb->bpb_secperclus) if(sec_cnt >= bpb->bpb_secperclus)
{ {
/* We have reached the end of this cluster */ /* We have reached the end of this cluster */
printf("Moving to the next cluster..."); DEBUG("Moving to the next cluster...");
currdir = fat_get_next_cluster(bpb, currdir); currdir = get_next_cluster(bpb, currdir);
printf("new cluster is %d\n", currdir); DEBUG1("new cluster is %d\n", currdir);
if(!currdir) if(!currdir)
{ {
@ -578,12 +557,12 @@ int fat_add_dir_entry(struct bpb *bpb, unsigned int currdir,
} }
} }
printf("Reading sector %d...\n", sec); DEBUG1("Reading sector %d...\n", sec);
/* Read the next sector in the current dir */ /* Read the next sector in the current dir */
err = ata_read_sectors(sec,1,buf); err = ata_read_sectors(sec,1,buf);
if(err) if(err)
{ {
fprintf(stderr, "fat_add_dir_entry() - Couldn't read dir sector" DEBUG1( "add_dir_entry() - Couldn't read dir sector"
" (error code %i)\n", err); " (error code %i)\n", err);
return -1; return -1;
} }
@ -591,7 +570,7 @@ int fat_add_dir_entry(struct bpb *bpb, unsigned int currdir,
if(need_to_update_last_empty_marker) if(need_to_update_last_empty_marker)
{ {
/* All we need to do is to set the first entry to 0 */ /* All we need to do is to set the first entry to 0 */
printf("Clearing the first entry in sector %d\n", sec); DEBUG1("Clearing the first entry in sector %d\n", sec);
buf[0] = 0; buf[0] = 0;
done = 1; done = 1;
} }
@ -603,7 +582,7 @@ int fat_add_dir_entry(struct bpb *bpb, unsigned int currdir,
firstbyte = buf[i]; firstbyte = buf[i];
if(firstbyte == 0xe5 || firstbyte == 0) if(firstbyte == 0xe5 || firstbyte == 0)
{ {
printf("Found free slot at entry %d in sector %d\n", DEBUG2("Found free slot at entry %d in sector %d\n",
i/32, sec); i/32, sec);
eptr = &buf[i]; eptr = &buf[i];
memset(eptr, 0, 32); memset(eptr, 0, 32);
@ -648,7 +627,7 @@ int fat_add_dir_entry(struct bpb *bpb, unsigned int currdir,
err = ata_write_sectors(sec,1,buf); err = ata_write_sectors(sec,1,buf);
if(err) if(err)
{ {
fprintf(stderr, "fat_add_dir_entry() - " DEBUG1( "add_dir_entry() - "
" Couldn't write dir" " Couldn't write dir"
" sector (error code %i)\n", err); " sector (error code %i)\n", err);
return -1; return -1;
@ -664,7 +643,7 @@ int fat_add_dir_entry(struct bpb *bpb, unsigned int currdir,
return 0; return 0;
} }
unsigned char fat_char2dos(unsigned char c) unsigned char char2dos(unsigned char c)
{ {
switch(c) switch(c)
{ {
@ -701,7 +680,7 @@ unsigned char fat_char2dos(unsigned char c)
return c; return c;
} }
int fat_create_dos_name(unsigned char *name, unsigned char *newname) static int create_dos_name(unsigned char *name, unsigned char *newname)
{ {
unsigned char n[12]; unsigned char n[12];
unsigned char c; unsigned char c;
@ -731,7 +710,7 @@ int fat_create_dos_name(unsigned char *name, unsigned char *newname)
/* Name part */ /* Name part */
for(i = 0;n[i] && (i < 8);i++) for(i = 0;n[i] && (i < 8);i++)
{ {
c = fat_char2dos(n[i]); c = char2dos(n[i]);
if(c) if(c)
{ {
newname[i] = toupper(c); newname[i] = toupper(c);
@ -745,7 +724,7 @@ int fat_create_dos_name(unsigned char *name, unsigned char *newname)
/* Extension part */ /* Extension part */
for(i = 0;ext && ext[i] && (i < 3);i++) for(i = 0;ext && ext[i] && (i < 3);i++)
{ {
c = fat_char2dos(ext[i]); c = char2dos(ext[i]);
if(c) if(c)
{ {
newname[8+i] = toupper(c); newname[8+i] = toupper(c);
@ -763,21 +742,21 @@ int fat_create_dir(struct bpb *bpb, unsigned int currdir, char *name)
struct fat_direntry de; struct fat_direntry de;
int err; int err;
printf("fat_create_file()\n"); DEBUG("fat_create_file()\n");
memset(&de, 0, sizeof(struct fat_direntry)); memset(&de, 0, sizeof(struct fat_direntry));
if(fat_create_dos_name(name, de.name) < 0) if(create_dos_name(name, de.name) < 0)
{ {
fprintf(stderr, "fat_create_file() - Illegal file name (%s)\n", name); DEBUG1( "fat_create_file() - Illegal file name (%s)\n", name);
return -1; return -1;
} }
fat_getcurrdostime(&de.crtdate, &de.crttime, &de.crttimetenth); getcurrdostime(&de.crtdate, &de.crttime, &de.crttimetenth);
de.wrtdate = de.crtdate; de.wrtdate = de.crtdate;
de.wrttime = de.crttime; de.wrttime = de.crttime;
de.filesize = 0; de.filesize = 0;
de.attr = FAT_ATTR_DIRECTORY; de.attr = FAT_ATTR_DIRECTORY;
err = fat_add_dir_entry(bpb, currdir, &de); err = add_dir_entry(bpb, currdir, &de);
return 0; return 0;
} }
@ -786,23 +765,23 @@ int fat_create_file(struct bpb *bpb, unsigned int currdir, char *name)
struct fat_direntry de; struct fat_direntry de;
int err; int err;
printf("fat_create_file()\n"); DEBUG("fat_create_file()\n");
memset(&de, 0, sizeof(struct fat_direntry)); memset(&de, 0, sizeof(struct fat_direntry));
if(fat_create_dos_name(name, de.name) < 0) if(create_dos_name(name, de.name) < 0)
{ {
fprintf(stderr, "fat_create_file() - Illegal file name (%s)\n", name); DEBUG1( "fat_create_file() - Illegal file name (%s)\n", name);
return -1; return -1;
} }
fat_getcurrdostime(&de.crtdate, &de.crttime, &de.crttimetenth); getcurrdostime(&de.crtdate, &de.crttime, &de.crttimetenth);
de.wrtdate = de.crtdate; de.wrtdate = de.crtdate;
de.wrttime = de.crttime; de.wrttime = de.crttime;
de.filesize = 0; de.filesize = 0;
err = fat_add_dir_entry(bpb, currdir, &de); err = add_dir_entry(bpb, currdir, &de);
return err; return err;
} }
int fat_parse_direntry(struct fat_direntry *de, char *buf) static int parse_direntry(struct fat_direntry *de, char *buf)
{ {
/* is this a long filename entry? */ /* is this a long filename entry? */
if ( ( buf[FATDIR_ATTR] & FAT_ATTR_LONG_NAME_MASK ) == if ( ( buf[FATDIR_ATTR] & FAT_ATTR_LONG_NAME_MASK ) ==
@ -824,7 +803,9 @@ int fat_parse_direntry(struct fat_direntry *de, char *buf)
return 1; return 1;
} }
int fat_opendir(struct bpb *bpb, struct fat_dirent *ent, unsigned int currdir) int fat_opendir(struct bpb *bpb,
struct fat_dirent *ent,
unsigned int currdir)
{ {
int is_rootdir = (currdir == 0); int is_rootdir = (currdir == 0);
unsigned int sec; unsigned int sec;
@ -832,18 +813,18 @@ int fat_opendir(struct bpb *bpb, struct fat_dirent *ent, unsigned int currdir)
if(is_rootdir) if(is_rootdir)
{ {
sec = fat_get_rootdir_sector(bpb); sec = bpb->rootdirsector;
} }
else else
{ {
sec = fat_first_sector_of_cluster(bpb, currdir); sec = first_sector_of_cluster(bpb, currdir);
} }
/* Read the first sector in the current dir */ /* Read the first sector in the current dir */
err = ata_read_sectors(sec,1,ent->cached_buf); err = ata_read_sectors(sec,1,ent->cached_buf);
if(err) if(err)
{ {
fprintf(stderr, "fat_getfirst() - Couldn't read dir sector" DEBUG1( "fat_getfirst() - Couldn't read dir sector"
" (error code %i)\n", err); " (error code %i)\n", err);
return -1; return -1;
} }
@ -851,6 +832,7 @@ int fat_opendir(struct bpb *bpb, struct fat_dirent *ent, unsigned int currdir)
ent->entry = 0; ent->entry = 0;
ent->cached_sec = sec; ent->cached_sec = sec;
ent->num_sec = 0; ent->num_sec = 0;
return 0; return 0;
} }
@ -872,55 +854,64 @@ int fat_getnext(struct bpb *bpb,
if(firstbyte == 0xe5) if(firstbyte == 0xe5)
continue; continue;
if(firstbyte == 0) { if(firstbyte == 0)
printf("Firstbyte == 0\n"); /* no more entries */
return -1; return -1;
}
if ( fat_parse_direntry(entry, &ent->cached_buf[i*32]) ) { if ( parse_direntry(entry, &ent->cached_buf[i*32]) ) {
done = 1; done = 1;
break; break;
} }
} }
/* Next sector? */ /* Next sector? */
if(i >= BLOCK_SIZE/32) if(i < BLOCK_SIZE/32)
{
i++;
}
else
{ {
ent->num_sec++; ent->num_sec++;
ent->cached_sec++;
/* Do we need to advance one cluster? */ /* Do we need to advance one cluster? */
if(ent->num_sec >= bpb->bpb_secperclus) if(ent->num_sec < bpb->bpb_secperclus)
{ {
int cluster = fat_sec2cluster(bpb, ent->cached_sec); ent->cached_sec++;
}
else
{
int cluster = sec2cluster(bpb, ent->cached_sec);
if ( cluster < 0 ) { if ( cluster < 0 ) {
printf("sec2cluster failed\n"); DEBUG("sec2cluster failed\n");
return -1; return -1;
} }
ent->num_sec = 0; ent->num_sec = 0;
ent->cached_sec = fat_get_next_cluster( bpb, cluster ); cluster = get_next_cluster( bpb, cluster );
if(!ent->cached_sec) if(!cluster)
{ {
printf("End of cluster chain.\n"); DEBUG("End of cluster chain.\n");
return -1;
}
ent->cached_sec = cluster2sec(bpb,cluster);
if ( ent->cached_sec < 0 )
{
DEBUG1("Invalid cluster: %d\n",cluster);
return -1; return -1;
} }
}
}
/* Read the next sector */ /* Read the next sector */
err = ata_read_sectors(ent->cached_sec,1,ent->cached_buf); err = ata_read_sectors(ent->cached_sec,1,ent->cached_buf);
if(err) if(err)
{ {
fprintf(stderr, "fat_getnext() - Couldn't read dir sector" DEBUG1( "fat_getnext() - Couldn't read dir sector"
" (error code %i)\n", err); " (error code %i)\n", err);
return -1; return -1;
} }
i = 0; i = 0;
} }
else
{
i++;
}
ent->entry = i; ent->entry = i;
} }
return 0; return 0;

118
firmware/drivers/fat.h
View file

@ -22,38 +22,6 @@
#define BLOCK_SIZE 512 #define BLOCK_SIZE 512
#define FATTYPE_FAT12 0
#define FATTYPE_FAT16 1
#define FATTYPE_FAT32 2
#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
#define BS_DRVNUM 36
#define BS_RESERVED1 37
#define BS_BOOTSIG 38
#define BS_VOLID 39
#define BS_VOLLAB 43
#define BS_FILSYSTYPE 54
#define BPB_FATSZ32 36
#define BPB_LAST_WORD 510
#define MIN(a,b) (((a) < (b))?(a):(b))
struct bpb struct bpb
{ {
char bs_oemname[9]; /* OEM string, ending with \0 */ char bs_oemname[9]; /* OEM string, ending with \0 */
@ -70,6 +38,8 @@ struct bpb
int bpb_hiddsec; /* Hidden sectors before the volume */ int bpb_hiddsec; /* Hidden sectors before the volume */
unsigned int bpb_totsec32; /* Number of sectors on the volume unsigned int bpb_totsec32; /* Number of sectors on the volume
(new 32-bit) */ (new 32-bit) */
int last_word; /* 0xAA55 */
/**** FAT12/16 specific *****/ /**** FAT12/16 specific *****/
int bs_drvnum; /* Drive number */ int bs_drvnum; /* Drive number */
int bs_bootsig; /* Is 0x29 if the following 3 fields are valid */ int bs_bootsig; /* Is 0x29 if the following 3 fields are valid */
@ -86,8 +56,27 @@ struct bpb
int bpb_bkbootsec; int bpb_bkbootsec;
/* variables for internal use */ /* variables for internal use */
int fat_type; /* FAT12, FAT16 or FAT32 */ int fatsize;
int last_word; /* must be 0xAA55 */ int totalsectors;
int rootdirsector;
int firstdatasector;
};
struct fat_direntry
{
unsigned char name[12]; /* Name plus \0 */
unsigned short attr; /* Attributes */
unsigned char crttimetenth; /* Millisecond creation
time stamp (0-199) */
unsigned short crttime; /* Creation time */
unsigned short crtdate; /* Creation date */
unsigned short lstaccdate; /* Last access date */
unsigned short fstclushi; /* High word of first cluster
(0 for FAT12/16) */
unsigned short wrttime; /* Last write time */
unsigned short wrtdate; /* Last write date */
unsigned short fstcluslo; /* Low word of first cluster */
unsigned int filesize; /* File size in bytes */
}; };
#define FAT_ATTR_READ_ONLY 0x01 #define FAT_ATTR_READ_ONLY 0x01
@ -96,68 +85,21 @@ struct bpb
#define FAT_ATTR_VOLUME_ID 0x08 #define FAT_ATTR_VOLUME_ID 0x08
#define FAT_ATTR_DIRECTORY 0x10 #define FAT_ATTR_DIRECTORY 0x10
#define FAT_ATTR_ARCHIVE 0x20 #define FAT_ATTR_ARCHIVE 0x20
#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
struct fat_direntry
{
unsigned char name[12]; /* Name plus \0 */
unsigned short attr; /* Attributes */
unsigned char crttimetenth; /* Millisecond creation
time stamp (0-199) */
unsigned short crttime; /* Creation time */
unsigned short crtdate; /* Creation date */
unsigned short lstaccdate; /* Last access date */
unsigned short fstclushi; /* High word of first cluster
(0 for FAT12/16) */
unsigned short wrttime; /* Last write time */
unsigned short wrtdate; /* Last write date */
unsigned short fstcluslo; /* Low word of first cluster */
unsigned int filesize; /* File size in bytes */
};
struct fat_context
{
unsigned int curr_dir_sec; /* Current directory sector */
};
struct disk_info
{
int num_sectors;
int sec_per_track;
int num_heads;
unsigned int hidden_sectors;
};
struct fat_dirent struct fat_dirent
{ {
int entry; int entry;
unsigned int cached_sec; unsigned int cached_sec;
unsigned int num_sec; unsigned int num_sec;
char cached_buf[BLOCK_SIZE]; char cached_buf[BLOCK_SIZE];
}; };
extern int fat_create_file(struct bpb *bpb, extern int fat_create_file(struct bpb *bpb,
unsigned int currdir, unsigned int currdir,
char *name); char *name);
extern int fat_create_dir(struct bpb *bpb,
unsigned int currdir,
char *name);
extern int fat_opendir(struct bpb *bpb, extern int fat_opendir(struct bpb *bpb,
struct fat_dirent *ent, struct fat_dirent *ent,
unsigned int currdir); unsigned int currdir);