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134 lines
4.9 KiB
C
134 lines
4.9 KiB
C
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#ifndef __FAT_ACCESS_H__
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#define __FAT_ACCESS_H__
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#include "fat_defs.h"
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#include "fat_opts.h"
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//-----------------------------------------------------------------------------
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// Defines
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//-----------------------------------------------------------------------------
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#define FAT_INIT_OK 0
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#define FAT_INIT_MEDIA_ACCESS_ERROR (-1)
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#define FAT_INIT_INVALID_SECTOR_SIZE (-2)
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#define FAT_INIT_INVALID_SIGNATURE (-3)
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#define FAT_INIT_ENDIAN_ERROR (-4)
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#define FAT_INIT_WRONG_FILESYS_TYPE (-5)
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#define FAT_INIT_WRONG_PARTITION_TYPE (-6)
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#define FAT_INIT_STRUCT_PACKING (-7)
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#define FAT_DIR_ENTRIES_PER_SECTOR (FAT_SECTOR_SIZE / FAT_DIR_ENTRY_SIZE)
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//-----------------------------------------------------------------------------
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// Function Pointers
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//-----------------------------------------------------------------------------
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typedef int (*fn_diskio_read) (uint32 sector, uint8 *buffer, uint32 sector_count);
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typedef int (*fn_diskio_write)(uint32 sector, uint8 *buffer, uint32 sector_count);
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//-----------------------------------------------------------------------------
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// Structures
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//-----------------------------------------------------------------------------
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struct disk_if
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{
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// User supplied function pointers for disk IO
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fn_diskio_read read_media;
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fn_diskio_write write_media;
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};
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// Forward declaration
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struct fat_buffer;
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struct fat_buffer
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{
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uint8 sector[FAT_SECTOR_SIZE * FAT_BUFFER_SECTORS];
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uint32 address;
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int dirty;
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uint8 * ptr;
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// Next in chain of sector buffers
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struct fat_buffer *next;
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};
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typedef enum eFatType
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{
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FAT_TYPE_16,
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FAT_TYPE_32
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} tFatType;
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struct fatfs
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{
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// Filesystem globals
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uint8 sectors_per_cluster;
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uint32 cluster_begin_lba;
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uint32 rootdir_first_cluster;
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uint32 rootdir_first_sector;
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uint32 rootdir_sectors;
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uint32 fat_begin_lba;
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uint16 fs_info_sector;
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uint32 lba_begin;
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uint32 fat_sectors;
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uint32 next_free_cluster;
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uint16 root_entry_count;
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uint16 reserved_sectors;
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uint8 num_of_fats;
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tFatType fat_type;
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// Disk/Media API
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struct disk_if disk_io;
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// [Optional] Thread Safety
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void (*fl_lock)(void);
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void (*fl_unlock)(void);
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// Working buffer
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struct fat_buffer currentsector;
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// FAT Buffer
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struct fat_buffer *fat_buffer_head;
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struct fat_buffer fat_buffers[FAT_BUFFERS];
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};
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struct fs_dir_list_status
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{
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uint32 sector;
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uint32 cluster;
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uint8 offset;
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};
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struct fs_dir_ent
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{
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char filename[FATFS_MAX_LONG_FILENAME];
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uint8 is_dir;
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uint32 cluster;
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uint32 size;
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#if FATFS_INC_TIME_DATE_SUPPORT
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uint16 access_date;
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uint16 write_time;
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uint16 write_date;
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uint16 create_date;
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uint16 create_time;
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#endif
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};
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//-----------------------------------------------------------------------------
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// Prototypes
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//-----------------------------------------------------------------------------
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int fatfs_init(struct fatfs *fs);
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uint32 fatfs_lba_of_cluster(struct fatfs *fs, uint32 Cluster_Number);
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int fatfs_sector_reader(struct fatfs *fs, uint32 Startcluster, uint32 offset, uint8 *target);
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int fatfs_sector_read(struct fatfs *fs, uint32 lba, uint8 *target, uint32 count);
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int fatfs_sector_write(struct fatfs *fs, uint32 lba, uint8 *target, uint32 count);
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int fatfs_read_sector(struct fatfs *fs, uint32 cluster, uint32 sector, uint8 *target);
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int fatfs_write_sector(struct fatfs *fs, uint32 cluster, uint32 sector, uint8 *target);
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void fatfs_show_details(struct fatfs *fs);
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uint32 fatfs_get_root_cluster(struct fatfs *fs);
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uint32 fatfs_get_file_entry(struct fatfs *fs, uint32 Cluster, char *nametofind, struct fat_dir_entry *sfEntry);
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int fatfs_sfn_exists(struct fatfs *fs, uint32 Cluster, char *shortname);
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int fatfs_update_file_length(struct fatfs *fs, uint32 Cluster, char *shortname, uint32 fileLength);
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int fatfs_mark_file_deleted(struct fatfs *fs, uint32 Cluster, char *shortname);
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void fatfs_list_directory_start(struct fatfs *fs, struct fs_dir_list_status *dirls, uint32 StartCluster);
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int fatfs_list_directory_next(struct fatfs *fs, struct fs_dir_list_status *dirls, struct fs_dir_ent *entry);
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int fatfs_update_timestamps(struct fat_dir_entry *directoryEntry, int create, int modify, int access);
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#endif
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