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Member "dosfstools-4.2/src/msdos_fs.h" (31 Jan 2021, 2403 Bytes) of package /linux/misc/dosfstools-4.2.tar.gz:


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    1 /* msdos_fs.h - MS-DOS filesystem constants/structures
    2 
    3    This program is free software: you can redistribute it and/or modify
    4    it under the terms of the GNU General Public License as published by
    5    the Free Software Foundation, either version 3 of the License, or
    6    (at your option) any later version.
    7 
    8    This program is distributed in the hope that it will be useful,
    9    but WITHOUT ANY WARRANTY; without even the implied warranty of
   10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
   11    GNU General Public License for more details.
   12 
   13    You should have received a copy of the GNU General Public License
   14    along with this program. If not, see <http://www.gnu.org/licenses/>.
   15 
   16    The complete text of the GNU General Public License
   17    can be found in /usr/share/common-licenses/GPL-3 file.
   18 */
   19 
   20 #ifndef _MSDOS_FS_H
   21 #define _MSDOS_FS_H
   22 
   23 #include <stdint.h>
   24 
   25 #define SECTOR_SIZE 512     /* sector size (bytes) */
   26 #define MSDOS_DPS (SECTOR_SIZE / sizeof(struct msdos_dir_entry))
   27 #define MSDOS_DPS_BITS 4    /* log2(MSDOS_DPS) */
   28 #define MSDOS_DIR_BITS 5    /* log2(sizeof(struct msdos_dir_entry)) */
   29 
   30 #define ATTR_NONE 0 /* no attribute bits */
   31 #define ATTR_RO 1   /* read-only */
   32 #define ATTR_HIDDEN 2   /* hidden */
   33 #define ATTR_SYS 4  /* system */
   34 #define ATTR_VOLUME 8   /* volume label */
   35 #define ATTR_DIR 16 /* directory */
   36 #define ATTR_ARCH 32    /* archived */
   37 
   38 /* attribute bits that are copied "as is" */
   39 #define ATTR_UNUSED (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN)
   40 
   41 #define DELETED_FLAG 0xe5   /* marks file as deleted when in name[0] */
   42 #define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG)
   43 
   44 #define MSDOS_NAME 11           /* maximum name length */
   45 #define MSDOS_DOT ".          "     /* ".", padded to MSDOS_NAME chars */
   46 #define MSDOS_DOTDOT "..         "  /* "..", padded to MSDOS_NAME chars */
   47 
   48 struct msdos_dir_entry {
   49     uint8_t name[MSDOS_NAME];   /* name including extension */
   50     uint8_t attr;       /* attribute bits */
   51     uint8_t lcase;      /* Case for base and extension */
   52     uint8_t ctime_cs;       /* Creation time, centiseconds (0-199) */
   53     uint16_t ctime;     /* Creation time */
   54     uint16_t cdate;     /* Creation date */
   55     uint16_t adate;     /* Last access date */
   56     uint16_t starthi;       /* High 16 bits of cluster in FAT32 */
   57     uint16_t time, date, start; /* time, date and first cluster */
   58     uint32_t size;      /* file size (in bytes) */
   59 } __attribute__ ((packed));
   60 
   61 #endif /* _MSDOS_FS_H */