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Diffstat (limited to 'include/fat.h')
| -rw-r--r-- | include/fat.h | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/include/fat.h b/include/fat.h new file mode 100644 index 0000000..bc139f8 --- /dev/null +++ b/include/fat.h @@ -0,0 +1,209 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * 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 + */ + +#ifndef _FAT_H_ +#define _FAT_H_ + +#include <asm/byteorder.h> +#include <fs.h> + +/* 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 + +#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) + +/* Maximum number of entry for long file name according to spec */ +#define MAX_LFN_SLOT 20 + +/* 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 + +#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; + +/* see dir_entry::lcase: */ +#define CASE_LOWER_BASE 8 /* base (name) is lower case */ +#define CASE_LOWER_EXT 16 /* extension is lower case */ + +typedef struct dir_entry { + char name[8],ext[3]; /* Name and extension */ + __u8 attr; /* Attribute bits */ + __u8 lcase; /* Case for name and ext (CASE_LOWER_x) */ + __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 */ + __u8 fat_dirty; /* Set if fatbuf has been modified */ + __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 */ + int rootdir_size; /* Size of root dir for non-FAT32 */ + __u32 root_cluster; /* First cluster of root dir for FAT32 */ + u32 total_sect; /* Number of sectors */ + int fats; /* Number of FATs */ +} fsdata; + +static inline u32 clust_to_sect(fsdata *fsdata, u32 clust) +{ + return fsdata->data_begin + clust * fsdata->clust_size; +} + +static inline u32 sect_to_clust(fsdata *fsdata, int sect) +{ + return (sect - fsdata->data_begin) / fsdata->clust_size; +} + +int file_fat_detectfs(void); +int fat_exists(const char *filename); +int fat_size(const char *filename, loff_t *size); +int file_fat_read_at(const char *filename, loff_t pos, void *buffer, + loff_t maxsize, loff_t *actread); +int file_fat_read(const char *filename, void *buffer, int maxsize); +int fat_set_blk_dev(struct blk_desc *rbdd, disk_partition_t *info); +int fat_register_device(struct blk_desc *dev_desc, int part_no); + +int file_fat_write(const char *filename, void *buf, loff_t offset, loff_t len, + loff_t *actwrite); +int fat_read_file(const char *filename, void *buf, loff_t offset, loff_t len, + loff_t *actread); +int fat_opendir(const char *filename, struct fs_dir_stream **dirsp); +int fat_readdir(struct fs_dir_stream *dirs, struct fs_dirent **dentp); +void fat_closedir(struct fs_dir_stream *dirs); +int fat_unlink(const char *filename); +int fat_mkdir(const char *dirname); +void fat_close(void); +#endif /* _FAT_H_ */ |