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Diffstat (limited to 'include/fat.h')
| -rw-r--r-- | include/fat.h | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/include/fat.h b/include/fat.h new file mode 100644 index 0000000..b56219c --- /dev/null +++ b/include/fat.h @@ -0,0 +1,208 @@ +/* + * R/O (V)FAT 12/16/32 filesystem implementation by Marcus Sundberg + * + * 2002-07-28 - rjones@nexus-tech.net - ported to ppcboot v1.1.6 + * 2003-03-10 - kharris@nexus-tech.net - ported to u-boot + * + * 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 _FAT_H_ +#define _FAT_H_ + +#define CONFIG_SUPPORT_VFAT + +#define SECTOR_SIZE FS_BLOCK_SIZE + +#define FS_BLOCK_SIZE 512 + +#if FS_BLOCK_SIZE != SECTOR_SIZE +#error FS_BLOCK_SIZE != SECTOR_SIZE - This code needs to be fixed! +#endif + +#define MAX_CLUSTSIZE 65536 +#define DIRENTSPERBLOCK (FS_BLOCK_SIZE/sizeof(dir_entry)) +#define DIRENTSPERCLUST ((mydata->clust_size*SECTOR_SIZE)/sizeof(dir_entry)) + +#define FATBUFBLOCKS 6 +#define FATBUFSIZE (FS_BLOCK_SIZE*FATBUFBLOCKS) +#define FAT12BUFSIZE ((FATBUFSIZE*3)/2) +#define FAT16BUFSIZE (FATBUFSIZE/2) +#define FAT32BUFSIZE (FATBUFSIZE/4) + + +/* Filesystem identifiers */ +#define FAT12_SIGN "FAT12 " +#define FAT16_SIGN "FAT16 " +#define FAT32_SIGN "FAT32 " +#define SIGNLEN 8 + +/* File attributes */ +#define ATTR_RO 1 +#define ATTR_HIDDEN 2 +#define ATTR_SYS 4 +#define ATTR_VOLUME 8 +#define ATTR_DIR 16 +#define ATTR_ARCH 32 + +#define ATTR_VFAT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME) + +#define DELETED_FLAG ((char)0xe5) /* Marks deleted files when in name[0] */ +#define aRING 0x05 /* Used to represent 'å' in name[0] */ + + +/* Flags telling whether we should read a file or list a directory */ +#define LS_NO 0 +#define LS_YES 1 +#define LS_DIR 1 +#define LS_ROOT 2 + +#ifdef DEBUG +#define FAT_DPRINT(args...) printf(args) +#else +#define FAT_DPRINT(args...) +#endif +#define FAT_ERROR(arg) printf(arg) + +#define ISDIRDELIM(c) ((c) == '/' || (c) == '\\') + +#define FSTYPE_NONE (-1) + +#if defined(__linux__) && defined(__KERNEL__) +#define FAT2CPU16 le16_to_cpu +#define FAT2CPU32 le32_to_cpu +#else +#if 1 +#define FAT2CPU16(x) (x) +#define FAT2CPU32(x) (x) +#else +#define FAT2CPU16(x) ((((x) & 0x00ff) << 8) | (((x) & 0xff00) >> 8)) +#define FAT2CPU32(x) ((((x) & 0x000000ff) << 24) | \ + (((x) & 0x0000ff00) << 8) | \ + (((x) & 0x00ff0000) >> 8) | \ + (((x) & 0xff000000) >> 24)) +#endif +#endif + +#define TOLOWER(c) if((c) >= 'A' && (c) <= 'Z'){(c)+=('a' - 'A');} +#define START(dent) (FAT2CPU16((dent)->start) \ + + (mydata->fatsize != 32 ? 0 : \ + (FAT2CPU16((dent)->starthi) << 16))) + + +typedef struct boot_sector { + __u8 ignored[3]; /* Bootstrap code */ + char system_id[8]; /* Name of fs */ + __u8 sector_size[2]; /* Bytes/sector */ + __u8 cluster_size; /* Sectors/cluster */ + __u16 reserved; /* Number of reserved sectors */ + __u8 fats; /* Number of FATs */ + __u8 dir_entries[2]; /* Number of root directory entries */ + __u8 sectors[2]; /* Number of sectors */ + __u8 media; /* Media code */ + __u16 fat_length; /* Sectors/FAT */ + __u16 secs_track; /* Sectors/track */ + __u16 heads; /* Number of heads */ + __u32 hidden; /* Number of hidden sectors */ + __u32 total_sect; /* Number of sectors (if sectors == 0) */ + + /* FAT32 only */ + __u32 fat32_length; /* Sectors/FAT */ + __u16 flags; /* Bit 8: fat mirroring, low 4: active fat */ + __u8 version[2]; /* Filesystem version */ + __u32 root_cluster; /* First cluster in root directory */ + __u16 info_sector; /* Filesystem info sector */ + __u16 backup_boot; /* Backup boot sector */ + __u16 reserved2[6]; /* Unused */ +} boot_sector; + +typedef struct volume_info +{ + __u8 drive_number; /* BIOS drive number */ + __u8 reserved; /* Unused */ + __u8 ext_boot_sign; /* 0x29 if fields below exist (DOS 3.3+) */ + __u8 volume_id[4]; /* Volume ID number */ + char volume_label[11]; /* Volume label */ + char fs_type[8]; /* Typically FAT12, FAT16, or FAT32 */ + /* Boot code comes next, all but 2 bytes to fill up sector */ + /* Boot sign comes last, 2 bytes */ +} volume_info; + +typedef struct dir_entry { + char name[8],ext[3]; /* Name and extension */ + __u8 attr; /* Attribute bits */ + __u8 lcase; /* Case for base and extension */ + __u8 ctime_ms; /* Creation time, milliseconds */ + __u16 ctime; /* Creation time */ + __u16 cdate; /* Creation date */ + __u16 adate; /* Last access date */ + __u16 starthi; /* High 16 bits of cluster in FAT32 */ + __u16 time,date,start;/* Time, date and first cluster */ + __u32 size; /* File size in bytes */ +} dir_entry; + +typedef struct dir_slot { + __u8 id; /* Sequence number for slot */ + __u8 name0_4[10]; /* First 5 characters in name */ + __u8 attr; /* Attribute byte */ + __u8 reserved; /* Unused */ + __u8 alias_checksum;/* Checksum for 8.3 alias */ + __u8 name5_10[12]; /* 6 more characters in name */ + __u16 start; /* Unused */ + __u8 name11_12[4]; /* Last 2 characters in name */ +} dir_slot; + +/* Private filesystem parameters */ +typedef struct { + int fatsize; /* Size of FAT in bits */ + __u16 fatlength; /* Length of FAT in sectors */ + __u16 fat_sect; /* Starting sector of the FAT */ + __u16 rootdir_sect; /* Start sector of root directory */ + __u16 clust_size; /* Size of clusters in sectors */ + __u16 data_begin; /* The sector of the first cluster */ + __u8 fatbuf[FATBUFSIZE]; /* Current FAT buffer */ + int fatbufnum; /* Used by get_fatent, init to -1 */ +} fsdata; + +typedef int (file_detectfs_func)(void); +typedef int (file_ls_func)(const char *dir); +typedef long (file_read_func)(const char *filename, void *buffer, + unsigned long maxsize); + +struct filesystem { + file_detectfs_func *detect; + file_ls_func *ls; + file_read_func *read; + const char name[12]; +}; + +/* FAT tables */ +file_detectfs_func file_fat_detectfs; +file_ls_func file_fat_ls; +file_read_func file_fat_read; + +/* Currently this doesn't check if the dir exists or is valid... */ +int file_cd(const char *path); +int file_fat_detectfs(void); +int file_fat_ls(const char *dir); +long file_fat_read(const char *filename, void *buffer, unsigned long maxsize); +const char *file_getfsname(int idx); + +#endif /* _FAT_H_ */ |