213 lines
6.6 KiB
C
213 lines
6.6 KiB
C
/*
|
|
* 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
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#ifndef _FAT_H_
|
|
#define _FAT_H_
|
|
|
|
#include <asm/byteorder.h>
|
|
|
|
#define CONFIG_SUPPORT_VFAT
|
|
/* Maximum Long File Name length supported here is 128 UTF-16 code units */
|
|
#define VFAT_MAXLEN_BYTES 256 /* Maximum LFN buffer in bytes */
|
|
#define VFAT_MAXSEQ 9 /* Up to 9 of 13 2-byte UTF-16 entries */
|
|
#define PREFETCH_BLOCKS 2
|
|
|
|
#ifndef CONFIG_FS_FAT_MAX_CLUSTSIZE
|
|
#define CONFIG_FS_FAT_MAX_CLUSTSIZE 65536
|
|
#endif
|
|
#define MAX_CLUSTSIZE CONFIG_FS_FAT_MAX_CLUSTSIZE
|
|
|
|
#define DIRENTSPERBLOCK (mydata->sect_size / sizeof(dir_entry))
|
|
#define DIRENTSPERCLUST ((mydata->clust_size * mydata->sect_size) / \
|
|
sizeof(dir_entry))
|
|
|
|
#define FATBUFBLOCKS 6
|
|
#define FATBUFSIZE (mydata->sect_size * FATBUFBLOCKS)
|
|
#define FAT12BUFSIZE ((FATBUFSIZE*2)/3)
|
|
#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 as special character in name[0] */
|
|
|
|
/*
|
|
* Indicates that the entry is the last long entry in a set of long
|
|
* dir entries
|
|
*/
|
|
#define LAST_LONG_ENTRY_MASK 0x40
|
|
|
|
/* 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
|
|
|
|
#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 __LITTLE_ENDIAN
|
|
#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 START(dent) (FAT2CPU16((dent)->start) \
|
|
+ (mydata->fatsize != 32 ? 0 : \
|
|
(FAT2CPU16((dent)->starthi) << 16)))
|
|
#define IS_LAST_CLUST(x, fatsize) ((x) >= ((fatsize) != 32 ? \
|
|
((fatsize) != 16 ? 0xff8 : 0xfff8) : \
|
|
0xffffff8))
|
|
#define CHECK_CLUST(x, fatsize) ((x) <= 1 || \
|
|
(x) >= ((fatsize) != 32 ? \
|
|
((fatsize) != 16 ? 0xff0 : 0xfff0) : \
|
|
0xffffff0))
|
|
|
|
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
|
|
*
|
|
* Note: FAT buffer has to be 32 bit aligned
|
|
* (see FAT32 accesses)
|
|
*/
|
|
typedef struct {
|
|
__u8 *fatbuf; /* Current FAT buffer */
|
|
int fatsize; /* Size of FAT in bits */
|
|
__u32 fatlength; /* Length of FAT in sectors */
|
|
__u16 fat_sect; /* Starting sector of the FAT */
|
|
__u32 rootdir_sect; /* Start sector of root directory */
|
|
__u16 sect_size; /* Size of sectors in bytes */
|
|
__u16 clust_size; /* Size of clusters in sectors */
|
|
int data_begin; /* The sector of the first cluster, can be negative */
|
|
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);
|
|
int fat_exists(const char *filename);
|
|
int fat_size(const char *filename);
|
|
long file_fat_read_at(const char *filename, unsigned long pos, void *buffer,
|
|
unsigned long maxsize);
|
|
long file_fat_read(const char *filename, void *buffer, unsigned long maxsize);
|
|
const char *file_getfsname(int idx);
|
|
int fat_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info);
|
|
int fat_register_device(block_dev_desc_t *dev_desc, int part_no);
|
|
|
|
int file_fat_write(const char *filename, void *buffer, unsigned long maxsize);
|
|
int fat_read_file(const char *filename, void *buf, int offset, int len);
|
|
void fat_close(void);
|
|
#endif /* _FAT_H_ */
|