forked from len0rd/rockbox
Cluster chaining now works.
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
parent
ccd3d0a6eb
commit
5661b2332f
2 changed files with 295 additions and 362 deletions
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@ -25,8 +25,6 @@
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#include <time.h>
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#include <sys/timeb.h>
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#define BLOCK_SIZE 512
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#include "fat.h"
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#include "ata.h"
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@ -41,41 +39,100 @@
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#define NUM_RESERVED_SECTORS 1
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#define NUM_BLOCKS 10000
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struct dsksz2secperclus
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{
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unsigned int disk_size;
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unsigned int sec_per_cluster;
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};
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#define FATTYPE_FAT12 0
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#define FATTYPE_FAT16 1
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#define FATTYPE_FAT32 2
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int fat_num_rootdir_sectors(struct bpb *bpb);
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int fat_first_sector_of_cluster(struct bpb *bpb, unsigned int cluster);
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int fat_get_fatsize(struct bpb* bpb);
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int fat_get_totsec(struct bpb* bpb);
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int fat_get_rootdir_sector(struct bpb *bpb);
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int fat_first_data_sector(struct bpb* bpb);
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int fat_get_bpb(struct bpb *bpb);
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int fat_bpb_is_sane(struct bpb *bpb);
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int fat_create_fat(struct bpb* bpb);
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int fat_dbg_read_block(char *name, unsigned char *buf);
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int fat_flush_fat(struct bpb *bpb);
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unsigned char *fat_cache_fat_sector(struct bpb *bpb, int secnum);
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int fat_update_entry(struct bpb *bpb, int entry, unsigned int val);
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unsigned int fat_getcurrdostime(unsigned short *dosdate,
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/* BPB offsets; generic */
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#define BS_JMPBOOT 0
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#define BS_OEMNAME 3
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#define BPB_BYTSPERSEC 11
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#define BPB_SECPERCLUS 13
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#define BPB_RSVDSECCNT 14
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#define BPB_NUMFATS 16
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#define BPB_ROOTENTCNT 17
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#define BPB_TOTSEC16 19
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#define BPB_MEDIA 21
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#define BPB_FATSZ16 22
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#define BPB_SECPERTRK 24
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#define BPB_NUMHEADS 26
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#define BPB_HIDDSEC 28
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#define BPB_TOTSEC32 32
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/* fat12/16 */
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#define BS_DRVNUM 36
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#define BS_RESERVED1 37
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#define BS_BOOTSIG 38
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#define BS_VOLID 39
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#define BS_VOLLAB 43
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#define BS_FILSYSTYPE 54
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/* fat32 */
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#define BPB_FATSZ32 36
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#define BPB_EXTFLAGS 40
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#define BPB_FSVER 42
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#define BPB_ROOTCLUS 44
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#define BPB_FSINFO 48
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#define BPB_BKBOOTSEC 50
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#define BS_32_DRVNUM 64
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#define BS_32_BOOTSIG 66
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#define BS_32_VOLID 67
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#define BS_32_VOLLAB 71
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#define BS_32_FILSYSTYPE 82
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#define BPB_LAST_WORD 510
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/* attributes */
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#define FAT_ATTR_LONG_NAME (FAT_ATTR_READ_ONLY | FAT_ATTR_HIDDEN | \
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FAT_ATTR_SYSTEM | FAT_ATTR_VOLUME_ID)
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#define FAT_ATTR_LONG_NAME_MASK (FAT_ATTR_READ_ONLY | FAT_ATTR_HIDDEN | \
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FAT_ATTR_SYSTEM | FAT_ATTR_VOLUME_ID | \
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FAT_ATTR_DIRECTORY | FAT_ATTR_ARCHIVE )
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#define FATDIR_NAME 0
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#define FATDIR_ATTR 11
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#define FATDIR_NTRES 12
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#define FATDIR_CRTTIMETENTH 13
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#define FATDIR_CRTTIME 14
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#define FATDIR_CRTDATE 16
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#define FATDIR_LSTACCDATE 18
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#define FATDIR_FSTCLUSHI 20
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#define FATDIR_WRTTIME 22
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#define FATDIR_WRTDATE 24
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#define FATDIR_FSTCLUSLO 26
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#define FATDIR_FILESIZE 28
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struct fsinfo {
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int freecount; /* last known free cluster count */
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int nextfree; /* first cluster to start looking for free clusters,
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or 0xffffffff for no hint */
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};
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/* fsinfo offsets */
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#define FSINFO_FREECOUNT 488
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#define FSINFO_NEXTFREE 492
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static int first_sector_of_cluster(struct bpb *bpb, unsigned int cluster);
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static int get_bpb(struct bpb *bpb);
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static int bpb_is_sane(struct bpb *bpb);
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static int flush_fat(struct bpb *bpb);
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static void *cache_fat_sector(struct bpb *bpb, int secnum);
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static int update_entry(struct bpb *bpb, int entry, unsigned int val);
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static unsigned int getcurrdostime(unsigned short *dosdate,
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unsigned short *dostime,
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unsigned char *dostenth);
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int fat_create_dos_name(unsigned char *name, unsigned char *newname);
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int fat_create_file(struct bpb *bpb, unsigned int currdir, char *name);
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unsigned char *fat_cache[256];
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int fat_cache_dirty[256];
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char current_directory[256] = "\\";
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struct bpb *global_bpb;
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struct disk_info di;
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static int create_dos_name(unsigned char *name, unsigned char *newname);
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static unsigned char *fat_cache[256];
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static int fat_cache_dirty[256];
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#ifdef TEST_FAT
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#include "debug.h"
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#define DEBUG(x) printf(x)
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#define DEBUG1(x,y) printf(x,y)
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#define DEBUG2(x,y1,y2) printf(x,y1,y2)
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#define DEBUG3(x,y1,y2,y3) printf(x,y1,y2,y3)
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int main(int argc, char *argv[])
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{
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@ -84,101 +141,56 @@ int main(int argc, char *argv[])
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memset(fat_cache, 0, sizeof(fat_cache));
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memset(fat_cache_dirty, 0, sizeof(fat_cache_dirty));
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di.num_sectors = NUM_BLOCKS;
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di.sec_per_track = 40;
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di.num_heads = 250;
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di.hidden_sectors = 0;
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if(ata_init())
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printf("*** Warning! The disk is uninitialized\n");
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DEBUG("*** Warning! The disk is uninitialized\n");
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else
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fat_get_bpb(&bpb);
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get_bpb(&bpb);
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global_bpb = &bpb;
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dbg_console(&bpb);
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return 0;
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}
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#else
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#define DEBUG(x);
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#define DEBUG1(x,y);
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#define DEBUG2(x,y1,y2);
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#define DEBUG3(x,y1,y2,y3);
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#endif
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int fat_sec2cluster(struct bpb *bpb, unsigned int sec)
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static int sec2cluster(struct bpb *bpb, unsigned int sec)
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{
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int first_sec = fat_first_data_sector(bpb);
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if(sec < first_sec)
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if ( sec < bpb->firstdatasector )
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{
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fprintf(stderr, "fat_sec2cluster() - Bad sector number (%d)\n", sec);
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DEBUG1( "sec2cluster() - Bad sector number (%d)\n", sec);
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return -1;
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}
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return ((sec - first_sec) / bpb->bpb_secperclus) + 2;
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return ((sec - bpb->firstdatasector) / bpb->bpb_secperclus) + 2;
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}
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int fat_cluster2sec(struct bpb *bpb, unsigned int cluster)
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static int cluster2sec(struct bpb *bpb, unsigned int cluster)
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{
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int max_cluster = (fat_get_totsec(bpb) - fat_first_data_sector(bpb)) /
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bpb->bpb_secperclus + 1;
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int max_cluster = bpb->totalsectors -
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bpb->firstdatasector / bpb->bpb_secperclus + 1;
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if(cluster > max_cluster)
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{
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fprintf(stderr, "fat_cluster2sec() - Bad cluster number (%d)\n",
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DEBUG1( "cluster2sec() - Bad cluster number (%d)\n",
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cluster);
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return -1;
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}
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return fat_first_sector_of_cluster(bpb, cluster);
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return first_sector_of_cluster(bpb, cluster);
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}
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int fat_first_sector_of_cluster(struct bpb *bpb, unsigned int cluster)
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static int first_sector_of_cluster(struct bpb *bpb, unsigned int cluster)
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{
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return (cluster - 2) * bpb->bpb_secperclus + fat_first_data_sector(bpb);
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return (cluster - 2) * bpb->bpb_secperclus + bpb->firstdatasector;
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}
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int fat_num_rootdir_sectors(struct bpb *bpb)
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{
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return ((bpb->bpb_rootentcnt * 32) + (bpb->bpb_bytspersec - 1)) /
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bpb->bpb_bytspersec;
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}
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int fat_get_fatsize(struct bpb* bpb)
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{
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if(bpb->bpb_fatsz16 != 0)
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return bpb->bpb_fatsz16;
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else
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return bpb->bpb_fatsz32;
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}
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int fat_get_totsec(struct bpb* bpb)
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{
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if(bpb->bpb_totsec16 != 0)
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return bpb->bpb_totsec16;
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else
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return bpb->bpb_totsec32;
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}
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int fat_get_rootdir_sector(struct bpb *bpb)
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{
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return bpb->bpb_rootclus;
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}
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int fat_first_data_sector(struct bpb* bpb)
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{
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int fatsz;
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int rootdirsectors;
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fatsz = fat_get_fatsize(bpb);
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rootdirsectors = fat_num_rootdir_sectors(bpb);
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return bpb->bpb_rsvdseccnt + bpb->bpb_numfats * fatsz + rootdirsectors;
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}
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int fat_get_bpb(struct bpb *bpb)
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static int get_bpb(struct bpb *bpb)
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{
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unsigned char buf[BLOCK_SIZE];
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int err;
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int fatsz;
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int rootdirsectors;
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int totsec;
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int datasec;
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int countofclusters;
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@ -186,7 +198,7 @@ int fat_get_bpb(struct bpb *bpb)
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err = ata_read_sectors(0,1,buf);
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if(err)
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{
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fprintf(stderr, "fat_get_bpb() - Couldn't read BPB (error code %i)\n",
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DEBUG1( "get_bpb() - Couldn't read BPB (error code %i)\n",
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err);
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return -1;
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}
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@ -204,158 +216,129 @@ int fat_get_bpb(struct bpb *bpb)
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bpb->bpb_totsec16 = BYTES2INT16(buf,BPB_TOTSEC16);
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bpb->bpb_media = buf[BPB_MEDIA];
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bpb->bpb_fatsz16 = BYTES2INT16(buf,BPB_FATSZ16);
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bpb->bpb_fatsz32 = BYTES2INT32(buf,BPB_FATSZ32);
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bpb->bpb_secpertrk = BYTES2INT16(buf,BPB_SECPERTRK);
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bpb->bpb_numheads = BYTES2INT16(buf,BPB_NUMHEADS);
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bpb->bpb_hiddsec = BYTES2INT32(buf,BPB_HIDDSEC);
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bpb->bpb_totsec32 = BYTES2INT32(buf,BPB_TOTSEC32);
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bpb->bs_drvnum = buf[BS_DRVNUM];
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bpb->bs_bootsig = buf[BS_BOOTSIG];
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bpb->bpb_fatsz32 = BYTES2INT32(buf,BPB_FATSZ32);
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bpb->last_word = BYTES2INT16(buf,BPB_LAST_WORD);
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/* calculate a few commonly used values */
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if (bpb->bpb_fatsz16 != 0)
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bpb->fatsize = bpb->bpb_fatsz16;
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else
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bpb->fatsize = bpb->bpb_fatsz32;
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if (bpb->bpb_totsec16 != 0)
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bpb->totalsectors = bpb->bpb_totsec16;
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else
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bpb->totalsectors = bpb->bpb_totsec32;
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bpb->firstdatasector = bpb->bpb_rsvdseccnt +
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bpb->bpb_numfats * bpb->fatsize;
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/* Determine FAT type */
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datasec = bpb->totalsectors - bpb->firstdatasector;
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countofclusters = datasec / bpb->bpb_secperclus;
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#ifdef TEST_FAT
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/*
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we are sometimes testing with "illegally small" fat32 images,
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so we don't use the proper fat32 test case for test code
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*/
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if ( bpb->bpb_fatsz16 )
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#else
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if ( countofclusters < 65525 )
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#endif
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{
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DEBUG("This is not FAT32. Go away!\n");
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return -1;
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}
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bpb->bpb_extflags = BYTES2INT16(buf,BPB_EXTFLAGS);
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bpb->bpb_fsver = BYTES2INT16(buf,BPB_FSVER);
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bpb->bpb_rootclus = BYTES2INT32(buf,BPB_ROOTCLUS);
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bpb->bpb_fsinfo = BYTES2INT16(buf,BPB_FSINFO);
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bpb->bpb_bkbootsec = BYTES2INT16(buf,BPB_BKBOOTSEC);
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bpb->bs_drvnum = buf[BS_32_DRVNUM];
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bpb->bs_bootsig = buf[BS_32_BOOTSIG];
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if(bpb->bs_bootsig == 0x29)
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{
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bpb->bs_volid = BYTES2INT32(buf,BS_VOLID);
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strncpy(bpb->bs_vollab, &buf[BS_VOLLAB], 11);
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strncpy(bpb->bs_filsystype, &buf[BS_FILSYSTYPE], 8);
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bpb->bs_volid = BYTES2INT32(buf,BS_32_VOLID);
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strncpy(bpb->bs_vollab, &buf[BS_32_VOLLAB], 11);
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strncpy(bpb->bs_filsystype, &buf[BS_32_FILSYSTYPE], 8);
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}
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/* Determine FAT type */
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fatsz = fat_get_fatsize(bpb);
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if (bpb->bpb_totsec16 != 0)
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totsec = bpb->bpb_totsec16;
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else
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totsec = bpb->bpb_totsec32;
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rootdirsectors = fat_num_rootdir_sectors(bpb);
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datasec = totsec - (bpb->bpb_rsvdseccnt + bpb->bpb_numfats * fatsz +
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rootdirsectors);
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countofclusters = datasec / bpb->bpb_secperclus;
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/* Determining FAT type:
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This is the "proper way" to do it:
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if (countofclusters < 4085)
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fat12
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else
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if (countofclusters < 65525)
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fat16
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else
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fat32
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*/
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/*
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This is the "real world way" to do it
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(since not all FAT32 partitions have >65524 clusters)
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*/
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if ( bpb->bpb_fatsz16 ) {
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printf("This is not FAT32. Go away!\n");
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return -1;
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}
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if (fat_bpb_is_sane(bpb) < 0)
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if (bpb_is_sane(bpb) < 0)
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{
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fprintf(stderr, "fat_get_bpb() - BPB is not sane\n");
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DEBUG( "get_bpb() - BPB is not sane\n");
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return -1;
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}
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bpb->rootdirsector = cluster2sec(bpb,bpb->bpb_rootclus);
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return 0;
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}
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int fat_bpb_is_sane(struct bpb *bpb)
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static int bpb_is_sane(struct bpb *bpb)
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{
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if(bpb->bpb_bytspersec != 512)
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{
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fprintf(stderr,
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"fat_bpb_is_sane() - Warning: sector size is not 512 (%i)\n",
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DEBUG1( "bpb_is_sane() - Warning: sector size is not 512 (%i)\n",
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bpb->bpb_bytspersec);
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}
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if(bpb->bpb_secperclus * bpb->bpb_bytspersec > 32768)
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{
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fprintf(stderr,
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"fat_bpb_is_sane() - Warning: cluster size is larger than 32K "
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DEBUG3( "bpb_is_sane() - Warning: cluster size is larger than 32K "
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"(%i * %i = %i)\n",
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bpb->bpb_bytspersec, bpb->bpb_secperclus,
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bpb->bpb_bytspersec * bpb->bpb_secperclus);
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}
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if(bpb->bpb_rsvdseccnt != 1)
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{
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fprintf(stderr,
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"fat_bpb_is_sane() - Warning: Reserved sectors is not 1 (%i)\n",
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DEBUG1( "bpb_is_sane() - Warning: Reserved sectors is not 1 (%i)\n",
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bpb->bpb_rsvdseccnt);
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}
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if(bpb->bpb_numfats != 2)
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{
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fprintf(stderr,
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"fat_bpb_is_sane() - Warning: NumFATS is not 2 (%i)\n",
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DEBUG1( "bpb_is_sane() - Warning: NumFATS is not 2 (%i)\n",
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bpb->bpb_numfats);
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}
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if(bpb->bpb_rootentcnt != 512)
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{
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fprintf(stderr,
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"fat_bpb_is_sane() - Warning: RootEntCnt is not 512 (%i)\n",
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DEBUG1( "bpb_is_sane() - Warning: RootEntCnt is not 512 (%i)\n",
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bpb->bpb_rootentcnt);
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}
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if(bpb->bpb_totsec16 < 200)
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{
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if(bpb->bpb_totsec16 == 0)
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{
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fprintf(stderr, "fat_bpb_is_sane() - Error: TotSec16 is 0\n");
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DEBUG( "bpb_is_sane() - Error: TotSec16 is 0\n");
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return -1;
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}
|
||||
else
|
||||
{
|
||||
fprintf(stderr,
|
||||
"fat_bpb_is_sane() - Warning: TotSec16 "
|
||||
DEBUG1( "bpb_is_sane() - Warning: TotSec16 "
|
||||
"is quite small (%i)\n",
|
||||
bpb->bpb_totsec16);
|
||||
}
|
||||
}
|
||||
if(bpb->bpb_media != 0xf0 && bpb->bpb_media < 0xf8)
|
||||
{
|
||||
fprintf(stderr,
|
||||
"fat_bpb_is_sane() - Warning: Non-standard "
|
||||
DEBUG1( "bpb_is_sane() - Warning: Non-standard "
|
||||
"media type (0x%02x)\n",
|
||||
bpb->bpb_media);
|
||||
}
|
||||
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);
|
||||
return -1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
int fat_dbg_read_block(char *name, unsigned char *buf)
|
||||
{
|
||||
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)
|
||||
static void *cache_fat_sector(struct bpb *bpb, int secnum)
|
||||
{
|
||||
unsigned char *sec;
|
||||
|
||||
|
|
@ -366,12 +349,12 @@ unsigned char *fat_cache_fat_sector(struct bpb *bpb, int secnum)
|
|||
sec = malloc(bpb->bpb_bytspersec);
|
||||
if(!sec)
|
||||
{
|
||||
fprintf(stderr, "fat_cache_fat_sector() - Out of memory\n");
|
||||
DEBUG( "cache_fat_sector() - Out of memory\n");
|
||||
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",
|
||||
secnum);
|
||||
free(sec);
|
||||
|
|
@ -382,66 +365,72 @@ unsigned char *fat_cache_fat_sector(struct bpb *bpb, int secnum)
|
|||
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;
|
||||
int fatsz;
|
||||
unsigned long *sec;
|
||||
int fatoffset;
|
||||
int thisfatsecnum;
|
||||
int thisfatentoffset;
|
||||
unsigned int tmp;
|
||||
|
||||
fatsz = fat_get_fatsize(bpb);
|
||||
fatoffset = entry * 4;
|
||||
thisfatsecnum = fatoffset / bpb->bpb_bytspersec;
|
||||
thisfatsecnum = fatoffset / bpb->bpb_bytspersec + bpb->bpb_rsvdseccnt;
|
||||
thisfatentoffset = fatoffset % bpb->bpb_bytspersec;
|
||||
|
||||
sec = fat_cache_fat_sector(bpb, thisfatsecnum);
|
||||
/* Load the sector if it is not cached */
|
||||
sec = cache_fat_sector(bpb, thisfatsecnum);
|
||||
if(!sec)
|
||||
{
|
||||
fprintf(stderr, "fat_update_entry() - Could not cache sector %d\n",
|
||||
DEBUG1( "update_entry() - Could not cache sector %d\n",
|
||||
thisfatsecnum);
|
||||
return -1;
|
||||
}
|
||||
|
||||
fat_cache_dirty[thisfatsecnum] = 1;
|
||||
|
||||
tmp = *(unsigned short *)(&sec[thisfatentoffset]) & 0xf000000;
|
||||
val = tmp | (val & 0x0fffffff);
|
||||
*(unsigned short *)(&sec[thisfatentoffset]) = val;
|
||||
/* don't change top 4 bits */
|
||||
sec[thisfatentoffset/sizeof(int)] &= 0xf000000;
|
||||
sec[thisfatentoffset/sizeof(int)] |= val & 0x0fffffff;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int fat_read_entry(struct bpb *bpb, int entry)
|
||||
static int read_entry(struct bpb *bpb, int entry)
|
||||
{
|
||||
unsigned char *sec;
|
||||
int fatsz;
|
||||
unsigned long *sec;
|
||||
int fatoffset;
|
||||
int thisfatsecnum;
|
||||
int thisfatentoffset;
|
||||
int val = -1;
|
||||
|
||||
fatsz = fat_get_fatsize(bpb);
|
||||
fatoffset = entry * 4;
|
||||
thisfatsecnum = fatoffset / bpb->bpb_bytspersec;
|
||||
thisfatsecnum = fatoffset / bpb->bpb_bytspersec + bpb->bpb_rsvdseccnt;
|
||||
thisfatentoffset = fatoffset % bpb->bpb_bytspersec;
|
||||
|
||||
sec = fat_cache_fat_sector(bpb, thisfatsecnum);
|
||||
/* Load the sector if it is not cached */
|
||||
sec = cache_fat_sector(bpb, thisfatsecnum);
|
||||
if(!sec)
|
||||
{
|
||||
fprintf(stderr, "fat_update_entry() - Could not cache sector %d\n",
|
||||
DEBUG1( "update_entry() - Could not cache sector %d\n",
|
||||
thisfatsecnum);
|
||||
return -1;
|
||||
}
|
||||
|
||||
val = *(unsigned int *)(&sec[thisfatentoffset]);
|
||||
val = sec[thisfatentoffset/sizeof(int)];
|
||||
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 err;
|
||||
|
|
@ -450,25 +439,25 @@ int fat_flush_fat(struct bpb *bpb)
|
|||
unsigned short d, t;
|
||||
char m;
|
||||
|
||||
fatsz = fat_get_fatsize(bpb);
|
||||
fatsz = bpb->fatsize;
|
||||
|
||||
for(i = 0;i < 256;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];
|
||||
err = ata_write_sectors(i + bpb->bpb_rsvdseccnt,1,sec);
|
||||
if(err)
|
||||
{
|
||||
fprintf(stderr, "fat_flush_fat() - Couldn't write"
|
||||
DEBUG1( "flush_fat() - Couldn't write"
|
||||
" sector (%d)\n", i + bpb->bpb_rsvdseccnt);
|
||||
return -1;
|
||||
}
|
||||
err = ata_write_sectors(i + bpb->bpb_rsvdseccnt + fatsz,1,sec);
|
||||
if(err)
|
||||
{
|
||||
fprintf(stderr, "fat_flush_fat() - Couldn't write"
|
||||
DEBUG1( "flush_fat() - Couldn't write"
|
||||
" sector (%d)\n", i + bpb->bpb_rsvdseccnt + fatsz);
|
||||
return -1;
|
||||
}
|
||||
|
|
@ -476,11 +465,11 @@ int fat_flush_fat(struct bpb *bpb)
|
|||
}
|
||||
}
|
||||
|
||||
fat_getcurrdostime(&d, &t, &m);
|
||||
getcurrdostime(&d, &t, &m);
|
||||
return 0;
|
||||
}
|
||||
|
||||
unsigned int fat_getcurrdostime(unsigned short *dosdate,
|
||||
unsigned int getcurrdostime(unsigned short *dosdate,
|
||||
unsigned short *dostime,
|
||||
unsigned char *dostenth)
|
||||
{
|
||||
|
|
@ -502,18 +491,8 @@ unsigned int fat_getcurrdostime(unsigned short *dosdate,
|
|||
return 0;
|
||||
}
|
||||
|
||||
int fat_get_next_cluster(struct bpb *bpb, unsigned int cluster)
|
||||
{
|
||||
int next_cluster = fat_read_entry(bpb, cluster);
|
||||
|
||||
/* 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,
|
||||
static int add_dir_entry(struct bpb *bpb,
|
||||
unsigned int currdir,
|
||||
struct fat_direntry *de)
|
||||
{
|
||||
unsigned char buf[BLOCK_SIZE];
|
||||
|
|
@ -529,11 +508,11 @@ int fat_add_dir_entry(struct bpb *bpb, unsigned int currdir,
|
|||
|
||||
if(is_rootdir)
|
||||
{
|
||||
sec = fat_get_rootdir_sector(bpb);
|
||||
sec = bpb->rootdirsector;
|
||||
}
|
||||
else
|
||||
{
|
||||
sec = fat_first_sector_of_cluster(bpb, currdir);
|
||||
sec = first_sector_of_cluster(bpb, currdir);
|
||||
}
|
||||
|
||||
sec_cnt = 0;
|
||||
|
|
@ -554,7 +533,7 @@ int fat_add_dir_entry(struct bpb *bpb, unsigned int currdir,
|
|||
}
|
||||
else
|
||||
{
|
||||
fprintf(stderr, "fat_add_dir_entry() -"
|
||||
DEBUG( "add_dir_entry() -"
|
||||
" Root dir is full\n");
|
||||
return -1;
|
||||
}
|
||||
|
|
@ -565,9 +544,9 @@ int fat_add_dir_entry(struct bpb *bpb, unsigned int currdir,
|
|||
if(sec_cnt >= bpb->bpb_secperclus)
|
||||
{
|
||||
/* We have reached the end of this cluster */
|
||||
printf("Moving to the next cluster...");
|
||||
currdir = fat_get_next_cluster(bpb, currdir);
|
||||
printf("new cluster is %d\n", currdir);
|
||||
DEBUG("Moving to the next cluster...");
|
||||
currdir = get_next_cluster(bpb, currdir);
|
||||
DEBUG1("new cluster is %d\n", 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 */
|
||||
err = ata_read_sectors(sec,1,buf);
|
||||
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);
|
||||
return -1;
|
||||
}
|
||||
|
|
@ -591,7 +570,7 @@ int fat_add_dir_entry(struct bpb *bpb, unsigned int currdir,
|
|||
if(need_to_update_last_empty_marker)
|
||||
{
|
||||
/* 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;
|
||||
done = 1;
|
||||
}
|
||||
|
|
@ -603,7 +582,7 @@ int fat_add_dir_entry(struct bpb *bpb, unsigned int currdir,
|
|||
firstbyte = buf[i];
|
||||
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);
|
||||
eptr = &buf[i];
|
||||
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);
|
||||
if(err)
|
||||
{
|
||||
fprintf(stderr, "fat_add_dir_entry() - "
|
||||
DEBUG1( "add_dir_entry() - "
|
||||
" Couldn't write dir"
|
||||
" sector (error code %i)\n", err);
|
||||
return -1;
|
||||
|
|
@ -664,7 +643,7 @@ int fat_add_dir_entry(struct bpb *bpb, unsigned int currdir,
|
|||
return 0;
|
||||
}
|
||||
|
||||
unsigned char fat_char2dos(unsigned char c)
|
||||
unsigned char char2dos(unsigned char c)
|
||||
{
|
||||
switch(c)
|
||||
{
|
||||
|
|
@ -701,7 +680,7 @@ unsigned char fat_char2dos(unsigned char 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 c;
|
||||
|
|
@ -731,7 +710,7 @@ int fat_create_dos_name(unsigned char *name, unsigned char *newname)
|
|||
/* Name part */
|
||||
for(i = 0;n[i] && (i < 8);i++)
|
||||
{
|
||||
c = fat_char2dos(n[i]);
|
||||
c = char2dos(n[i]);
|
||||
if(c)
|
||||
{
|
||||
newname[i] = toupper(c);
|
||||
|
|
@ -745,7 +724,7 @@ int fat_create_dos_name(unsigned char *name, unsigned char *newname)
|
|||
/* Extension part */
|
||||
for(i = 0;ext && ext[i] && (i < 3);i++)
|
||||
{
|
||||
c = fat_char2dos(ext[i]);
|
||||
c = char2dos(ext[i]);
|
||||
if(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;
|
||||
int err;
|
||||
|
||||
printf("fat_create_file()\n");
|
||||
DEBUG("fat_create_file()\n");
|
||||
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;
|
||||
}
|
||||
|
||||
fat_getcurrdostime(&de.crtdate, &de.crttime, &de.crttimetenth);
|
||||
getcurrdostime(&de.crtdate, &de.crttime, &de.crttimetenth);
|
||||
de.wrtdate = de.crtdate;
|
||||
de.wrttime = de.crttime;
|
||||
de.filesize = 0;
|
||||
de.attr = FAT_ATTR_DIRECTORY;
|
||||
|
||||
err = fat_add_dir_entry(bpb, currdir, &de);
|
||||
err = add_dir_entry(bpb, currdir, &de);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -786,23 +765,23 @@ int fat_create_file(struct bpb *bpb, unsigned int currdir, char *name)
|
|||
struct fat_direntry de;
|
||||
int err;
|
||||
|
||||
printf("fat_create_file()\n");
|
||||
DEBUG("fat_create_file()\n");
|
||||
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;
|
||||
}
|
||||
fat_getcurrdostime(&de.crtdate, &de.crttime, &de.crttimetenth);
|
||||
getcurrdostime(&de.crtdate, &de.crttime, &de.crttimetenth);
|
||||
de.wrtdate = de.crtdate;
|
||||
de.wrttime = de.crttime;
|
||||
de.filesize = 0;
|
||||
|
||||
err = fat_add_dir_entry(bpb, currdir, &de);
|
||||
err = add_dir_entry(bpb, currdir, &de);
|
||||
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? */
|
||||
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;
|
||||
}
|
||||
|
||||
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);
|
||||
unsigned int sec;
|
||||
|
|
@ -832,18 +813,18 @@ int fat_opendir(struct bpb *bpb, struct fat_dirent *ent, unsigned int currdir)
|
|||
|
||||
if(is_rootdir)
|
||||
{
|
||||
sec = fat_get_rootdir_sector(bpb);
|
||||
sec = bpb->rootdirsector;
|
||||
}
|
||||
else
|
||||
{
|
||||
sec = fat_first_sector_of_cluster(bpb, currdir);
|
||||
sec = first_sector_of_cluster(bpb, currdir);
|
||||
}
|
||||
|
||||
/* Read the first sector in the current dir */
|
||||
err = ata_read_sectors(sec,1,ent->cached_buf);
|
||||
if(err)
|
||||
{
|
||||
fprintf(stderr, "fat_getfirst() - Couldn't read dir sector"
|
||||
DEBUG1( "fat_getfirst() - Couldn't read dir sector"
|
||||
" (error code %i)\n", err);
|
||||
return -1;
|
||||
}
|
||||
|
|
@ -851,6 +832,7 @@ int fat_opendir(struct bpb *bpb, struct fat_dirent *ent, unsigned int currdir)
|
|||
ent->entry = 0;
|
||||
ent->cached_sec = sec;
|
||||
ent->num_sec = 0;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -872,55 +854,64 @@ int fat_getnext(struct bpb *bpb,
|
|||
if(firstbyte == 0xe5)
|
||||
continue;
|
||||
|
||||
if(firstbyte == 0) {
|
||||
printf("Firstbyte == 0\n");
|
||||
if(firstbyte == 0)
|
||||
/* no more entries */
|
||||
return -1;
|
||||
}
|
||||
|
||||
if ( fat_parse_direntry(entry, &ent->cached_buf[i*32]) ) {
|
||||
if ( parse_direntry(entry, &ent->cached_buf[i*32]) ) {
|
||||
done = 1;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/* Next sector? */
|
||||
if(i >= BLOCK_SIZE/32)
|
||||
if(i < BLOCK_SIZE/32)
|
||||
{
|
||||
i++;
|
||||
}
|
||||
else
|
||||
{
|
||||
ent->num_sec++;
|
||||
ent->cached_sec++;
|
||||
|
||||
/* 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 ) {
|
||||
printf("sec2cluster failed\n");
|
||||
DEBUG("sec2cluster failed\n");
|
||||
return -1;
|
||||
}
|
||||
ent->num_sec = 0;
|
||||
ent->cached_sec = fat_get_next_cluster( bpb, cluster );
|
||||
if(!ent->cached_sec)
|
||||
cluster = get_next_cluster( bpb, cluster );
|
||||
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;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
/* Read the next sector */
|
||||
err = ata_read_sectors(ent->cached_sec,1,ent->cached_buf);
|
||||
if(err)
|
||||
{
|
||||
fprintf(stderr, "fat_getnext() - Couldn't read dir sector"
|
||||
DEBUG1( "fat_getnext() - Couldn't read dir sector"
|
||||
" (error code %i)\n", err);
|
||||
return -1;
|
||||
}
|
||||
|
||||
i = 0;
|
||||
}
|
||||
else
|
||||
{
|
||||
i++;
|
||||
}
|
||||
ent->entry = i;
|
||||
}
|
||||
return 0;
|
||||
|
|
|
|||
|
|
@ -22,38 +22,6 @@
|
|||
|
||||
#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
|
||||
{
|
||||
char bs_oemname[9]; /* OEM string, ending with \0 */
|
||||
|
|
@ -70,6 +38,8 @@ struct bpb
|
|||
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 */
|
||||
|
|
@ -86,36 +56,12 @@ struct bpb
|
|||
int bpb_bkbootsec;
|
||||
|
||||
/* variables for internal use */
|
||||
int fat_type; /* FAT12, FAT16 or FAT32 */
|
||||
int last_word; /* must be 0xAA55 */
|
||||
int fatsize;
|
||||
int totalsectors;
|
||||
int rootdirsector;
|
||||
int firstdatasector;
|
||||
};
|
||||
|
||||
#define FAT_ATTR_READ_ONLY 0x01
|
||||
#define FAT_ATTR_HIDDEN 0x02
|
||||
#define FAT_ATTR_SYSTEM 0x04
|
||||
#define FAT_ATTR_VOLUME_ID 0x08
|
||||
#define FAT_ATTR_DIRECTORY 0x10
|
||||
#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 */
|
||||
|
|
@ -133,19 +79,12 @@ struct fat_direntry
|
|||
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;
|
||||
};
|
||||
#define FAT_ATTR_READ_ONLY 0x01
|
||||
#define FAT_ATTR_HIDDEN 0x02
|
||||
#define FAT_ATTR_SYSTEM 0x04
|
||||
#define FAT_ATTR_VOLUME_ID 0x08
|
||||
#define FAT_ATTR_DIRECTORY 0x10
|
||||
#define FAT_ATTR_ARCHIVE 0x20
|
||||
|
||||
struct fat_dirent
|
||||
{
|
||||
|
|
@ -158,6 +97,9 @@ struct fat_dirent
|
|||
extern int fat_create_file(struct bpb *bpb,
|
||||
unsigned int currdir,
|
||||
char *name);
|
||||
extern int fat_create_dir(struct bpb *bpb,
|
||||
unsigned int currdir,
|
||||
char *name);
|
||||
extern int fat_opendir(struct bpb *bpb,
|
||||
struct fat_dirent *ent,
|
||||
unsigned int currdir);
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue