minix/commands/i386/mtools-3.9.7/msdos.h
2005-04-21 14:53:53 +00:00

237 lines
7.3 KiB
C
Executable file

#ifndef MTOOLS_MSDOS_H
#define MTOOLS_MSDOS_H
/*
* msdos common header file
*/
#define MAX_SECTOR 8192 /* largest sector size */
#define MDIR_SIZE 32 /* MSDOS directory entry size in bytes*/
#define MAX_CLUSTER 8192 /* largest cluster size */
#define MAX_PATH 128 /* largest MSDOS path length */
#define MAX_DIR_SECS 64 /* largest directory (in sectors) */
#define MSECTOR_SIZE msector_size
#define NEW 1
#define OLD 0
#define _WORD(x) ((unsigned char)(x)[0] + (((unsigned char)(x)[1]) << 8))
#define _DWORD(x) (_WORD(x) + (_WORD((x)+2) << 16))
#define DELMARK ((char) 0xe5)
struct directory {
char name[8]; /* 0 file name */
char ext[3]; /* 8 file extension */
unsigned char attr; /* 11 attribute byte */
unsigned char Case; /* 12 case of short filename */
unsigned char ctime_ms; /* 13 creation time, milliseconds (?) */
unsigned char ctime[2]; /* 14 creation time */
unsigned char cdate[2]; /* 16 creation date */
unsigned char adate[2]; /* 18 last access date */
unsigned char startHi[2]; /* 20 start cluster, Hi */
unsigned char time[2]; /* 22 time stamp */
unsigned char date[2]; /* 24 date stamp */
unsigned char start[2]; /* 26 starting cluster number */
unsigned char size[4]; /* 28 size of the file */
};
#define EXTCASE 0x10
#define BASECASE 0x8
#define MAX32 0xffffffff
#define MAX_SIZE 0x7fffffff
#define FILE_SIZE(dir) (_DWORD((dir)->size))
#define START(dir) (_WORD((dir)->start))
#define STARTHI(dir) (_WORD((dir)->startHi))
/* ASSUMPTION: long is at least 32 bits */
UNUSED(static inline void set_dword(unsigned char *data, unsigned long value))
{
data[3] = (value >> 24) & 0xff;
data[2] = (value >> 16) & 0xff;
data[1] = (value >> 8) & 0xff;
data[0] = (value >> 0) & 0xff;
}
/* ASSUMPTION: short is at least 16 bits */
UNUSED(static inline void set_word(unsigned char *data, unsigned short value))
{
data[1] = (value >> 8) & 0xff;
data[0] = (value >> 0) & 0xff;
}
/*
* hi byte | low byte
* |7|6|5|4|3|2|1|0|7|6|5|4|3|2|1|0|
* | | | | | | | | | | | | | | | | |
* \ 7 bits /\4 bits/\ 5 bits /
* year +80 month day
*/
#define DOS_YEAR(dir) (((dir)->date[1] >> 1) + 1980)
#define DOS_MONTH(dir) (((((dir)->date[1]&0x1) << 3) + ((dir)->date[0] >> 5)))
#define DOS_DAY(dir) ((dir)->date[0] & 0x1f)
/*
* hi byte | low byte
* |7|6|5|4|3|2|1|0|7|6|5|4|3|2|1|0|
* | | | | | | | | | | | | | | | | |
* \ 5 bits /\ 6 bits /\ 5 bits /
* hour minutes sec*2
*/
#define DOS_HOUR(dir) ((dir)->time[1] >> 3)
#define DOS_MINUTE(dir) (((((dir)->time[1]&0x7) << 3) + ((dir)->time[0] >> 5)))
#define DOS_SEC(dir) (((dir)->time[0] & 0x1f) * 2)
typedef struct InfoSector_t {
unsigned char signature1[4];
unsigned char filler1[0x1e0];
unsigned char signature2[4];
unsigned char count[4];
unsigned char pos[4];
unsigned char filler2[14];
unsigned char signature3[2];
} InfoSector_t;
#define INFOSECT_SIGNATURE1 0x41615252
#define INFOSECT_SIGNATURE2 0x61417272
typedef struct label_blk_t {
unsigned char physdrive; /* 36 physical drive ? */
unsigned char reserved; /* 37 reserved */
unsigned char dos4; /* 38 dos > 4.0 diskette */
unsigned char serial[4]; /* 39 serial number */
char label[11]; /* 43 disk label */
char fat_type[8]; /* 54 FAT type */
} label_blk_t;
/* FAT32 specific info in the bootsector */
typedef struct fat32_t {
unsigned char bigFat[4]; /* 36 nb of sectors per FAT */
unsigned char extFlags[2]; /* 40 extension flags */
unsigned char fsVersion[2]; /* 42 ? */
unsigned char rootCluster[4]; /* 44 start cluster of root dir */
unsigned char infoSector[2]; /* 48 changeable global info */
unsigned char backupBoot[2]; /* 50 back up boot sector */
unsigned char reserved[6]; /* 52 ? */
unsigned char reserved2[6]; /* 52 ? */
struct label_blk_t labelBlock;
} fat32; /* ends at 58 */
typedef struct oldboot_t {
struct label_blk_t labelBlock;
unsigned char res_2m; /* 62 reserved by 2M */
unsigned char CheckSum; /* 63 2M checksum (not used) */
unsigned char fmt_2mf; /* 64 2MF format version */
unsigned char wt; /* 65 1 if write track after format */
unsigned char rate_0; /* 66 data transfer rate on track 0 */
unsigned char rate_any; /* 67 data transfer rate on track<>0 */
unsigned char BootP[2]; /* 68 offset to boot program */
unsigned char Infp0[2]; /* 70 T1: information for track 0 */
unsigned char InfpX[2]; /* 72 T2: information for track<>0 */
unsigned char InfTm[2]; /* 74 T3: track sectors size table */
unsigned char DateF[2]; /* 76 Format date */
unsigned char TimeF[2]; /* 78 Format time */
unsigned char junk[1024 - 80]; /* 80 remaining data */
} oldboot_t;
struct bootsector {
unsigned char jump[3]; /* 0 Jump to boot code */
char banner[8] PACKED; /* 3 OEM name & version */
unsigned char secsiz[2] PACKED; /* 11 Bytes per sector hopefully 512 */
unsigned char clsiz; /* 13 Cluster size in sectors */
unsigned char nrsvsect[2]; /* 14 Number of reserved (boot) sectors */
unsigned char nfat; /* 16 Number of FAT tables hopefully 2 */
unsigned char dirents[2] PACKED;/* 17 Number of directory slots */
unsigned char psect[2] PACKED; /* 19 Total sectors on disk */
unsigned char descr; /* 21 Media descriptor=first byte of FAT */
unsigned char fatlen[2]; /* 22 Sectors in FAT */
unsigned char nsect[2]; /* 24 Sectors/track */
unsigned char nheads[2]; /* 26 Heads */
unsigned char nhs[4]; /* 28 number of hidden sectors */
unsigned char bigsect[4]; /* 32 big total sectors */
union {
struct fat32_t fat32;
struct oldboot_t old;
} ext;
};
#define CHAR(x) (boot->x[0])
#define WORD(x) (_WORD(boot->x))
#define DWORD(x) (_DWORD(boot->x))
#define OFFSET(x) (((char *) (boot->x)) - ((char *)(boot->jump)))
extern struct OldDos_t {
int tracks;
int sectors;
int heads;
int dir_len;
int cluster_size;
int fat_len;
int media;
} old_dos[];
#define FAT12 4085 /* max. number of clusters described by a 12 bit FAT */
#define FAT16 65525
#define ATTR_ARCHIVE 0x20
#define ATTR_DIR 0x10
#define ATTR_LABEL 0x8
#define ATTR_SYSTEM 0x4
#define ATTR_HIDDEN 0x2
#define ATTR_READONLY 0x1
#define HAS_BIT(entry,x) ((entry)->dir.attr & (x))
#define IS_ARCHIVE(entry) (HAS_BIT((entry),ATTR_ARCHIVE))
#define IS_DIR(entry) (HAS_BIT((entry),ATTR_DIR))
#define IS_LABEL(entry) (HAS_BIT((entry),ATTR_LABEL))
#define IS_SYSTEM(entry) (HAS_BIT((entry),ATTR_SYSTEM))
#define IS_HIDDEN(entry) (HAS_BIT((entry),ATTR_HIDDEN))
#define IS_READONLY(entry) (HAS_BIT((entry),ATTR_READONLY))
#define MAX_SECT_PER_CLUSTER 64
/* Experimentally, it turns out that DOS only accepts cluster sizes
* which are powers of two, and less than 128 sectors (else it gets a
* divide overflow) */
#define FAT_SIZE(bits, sec_siz, clusters) \
((((clusters)+2) * ((bits)/4) - 1) / 2 / (sec_siz) + 1)
#define NEEDED_FAT_SIZE(x) FAT_SIZE((x)->fat_bits, (x)->sector_size, \
(x)->num_clus)
/* disk size taken by FAT and clusters */
#define DISK_SIZE(bits, sec_siz, clusters, n, cluster_size) \
((n) * FAT_SIZE(bits, sec_siz, clusters) + \
(clusters) * (cluster_size))
#define TOTAL_DISK_SIZE(bits, sec_siz, clusters, n, cluster_size) \
(DISK_SIZE(bits, sec_siz, clusters, n, cluster_size) + 2)
/* approx. total disk size: assume 1 boot sector and one directory sector */
extern const char *mversion;
extern const char *mdate;
extern char *Version;
extern char *Date;
int init(char drive, int mode);
#define MT_READ 1
#define MT_WRITE 2
#endif