diff options
Diffstat (limited to 'fs/fdos/dos.h')
| -rw-r--r-- | fs/fdos/dos.h | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/fs/fdos/dos.h b/fs/fdos/dos.h new file mode 100644 index 0000000..71701c9 --- /dev/null +++ b/fs/fdos/dos.h @@ -0,0 +1,177 @@ +/* + * (C) Copyright 2002 + * Stäubli Faverges - <www.staubli.com> + * Pierre AUBERT p.aubert@staubli.com + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#ifndef _DOS_H_ +#define _DOS_H_ + +/* Definitions for Dos diskettes */ + +/* General definitions */ +#define SZ_STD_SECTOR 512 /* Standard sector size */ +#define MDIR_SIZE 32 /* Direntry size */ +#define FAT_BITS 12 /* Diskette use 12 bits fat */ + +#define MAX_PATH 128 /* Max size of the MSDOS PATH */ +#define MAX_DIR_SECS 64 /* Taille max d'un repertoire (en */ + /* secteurs) */ +/* Misc. definitions */ +#define DELMARK '\xe5' +#define EXTENDED_BOOT (0x29) +#define MEDIA_STD (0xf0) +#define JUMP_0_1 (0xe9) +#define JUMP_0_2 (0xeb) + +/* Boot size is 256 bytes, but we need to read almost a sector, then + assume bootsize is 512 */ +#define BOOTSIZE 512 + +/* Fat definitions for 12 bits fat */ +#define FAT12_MAX_NB 4086 +#define FAT12_LAST 0x0ff6 +#define FAT12_END 0x0fff + +/* file attributes */ +#define ATTR_READONLY 0x01 +#define ATTR_HIDDEN 0x02 +#define ATTR_SYSTEM 0x04 +#define ATTR_VOLUME 0x08 +#define ATTR_DIRECTORY 0x10 +#define ATTR_ARCHIVE 0x20 +#define ATTR_VSE 0x0f + +/* Name format */ +#define EXTCASE 0x10 +#define BASECASE 0x8 + +/* Definition of the boot sector */ +#define BANNER_LG 8 +#define LABEL_LG 11 + +typedef struct bootsector +{ + unsigned char jump [3]; /* 0 Jump to boot code */ + char banner [BANNER_LG]; /* 3 OEM name & version */ + unsigned short secsiz; /* 11 Bytes per sector hopefully 512 */ + unsigned char clsiz; /* 13 Cluster size in sectors */ + unsigned short nrsvsect; /* 14 Number of reserved (boot) sectors */ + unsigned char nfat; /* 16 Number of FAT tables hopefully 2 */ + unsigned short dirents; /* 17 Number of directory slots */ + unsigned short psect; /* 19 Total sectors on disk */ + unsigned char descr; /* 21 Media descriptor=first byte of FAT */ + unsigned short fatlen; /* 22 Sectors in FAT */ + unsigned short nsect; /* 24 Sectors/track */ + unsigned short nheads; /* 26 Heads */ + unsigned int nhs; /* 28 number of hidden sectors */ + unsigned int bigsect; /* 32 big total sectors */ + unsigned char physdrive; /* 36 physical drive ? */ + unsigned char reserved; /* 37 reserved */ + unsigned char dos4; /* 38 dos > 4.0 diskette */ + unsigned int serial; /* 39 serial number */ + char label [LABEL_LG]; /* 43 disk label */ + char fat_type [8]; /* 54 FAT type */ + 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 short BootP; /* 68 offset to boot program */ + unsigned short Infp0; /* 70 T1: information for track 0 */ + unsigned short InfpX; /* 72 T2: information for track<>0 */ + unsigned short InfTm; /* 74 T3: track sectors size table */ + unsigned short DateF; /* 76 Format date */ + unsigned short TimeF; /* 78 Format time */ + unsigned char junk [BOOTSIZE - 80]; /* 80 remaining data */ +} __attribute__ ((packed)) BootSector_t; + +/* Structure d'une entree de repertoire */ +typedef struct directory { + char name [8]; /* file name */ + char ext [3]; /* file extension */ + unsigned char attr; /* attribute byte */ + unsigned char Case; /* case of short filename */ + unsigned char reserved [9]; /* ?? */ + unsigned char time [2]; /* time stamp */ + unsigned char date [2]; /* date stamp */ + unsigned short start; /* starting cluster number */ + unsigned int size; /* size of the file */ +} __attribute__ ((packed)) Directory_t; + + + +#define MAX_VFAT_SUBENTRIES 20 +#define VSE_NAMELEN 13 + +#define VSE1SIZE 5 +#define VSE2SIZE 6 +#define VSE3SIZE 2 + +#define VBUFSIZE ((MAX_VFAT_SUBENTRIES * VSE_NAMELEN) + 1) + +#define MAX_VNAMELEN (255) + +#define VSE_PRESENT 0x01 +#define VSE_LAST 0x40 +#define VSE_MASK 0x1f + +/* Flag used by vfat_lookup */ +#define DO_OPEN 1 +#define ACCEPT_PLAIN 0x20 +#define ACCEPT_DIR 0x10 +#define ACCEPT_LABEL 0x08 +#define SINGLE 2 +#define MATCH_ANY 0x40 + +struct vfat_subentry { + unsigned char id; /* VSE_LAST pour la fin, VSE_MASK */ + /* pour un VSE */ + char text1 [VSE1SIZE * 2]; /* Caracteres encodes sur 16 bits */ + unsigned char attribute; /* 0x0f pour les VFAT */ + unsigned char hash1; /* toujours 0 */ + unsigned char sum; /* Checksum du nom court */ + char text2 [VSE2SIZE * 2]; /* Caracteres encodes sur 16 bits */ + unsigned char sector_l; /* 0 pour les VFAT */ + unsigned char sector_u; /* 0 pour les VFAT */ + char text3 [VSE3SIZE * 2]; /* Caracteres encodes sur 16 bits */ +} __attribute__ ((packed)) ; + +struct vfat_state { + char name [VBUFSIZE]; + int status; /* is now a bit map of 32 bits */ + int subentries; + unsigned char sum; /* no need to remember the sum for each */ + /* entry, it is the same anyways */ +} __attribute__ ((packed)) ; + +/* Conversion macros */ +#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) +#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) + + +#endif + |