alexvoste
146 lines
3.8 KiB
C
146 lines
3.8 KiB
C
#ifndef FAT32_H
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#define FAT32_H
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#include <stdint.h>
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#include <stddef.h>
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#include <stdbool.h>
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#include "../drivers/blkdev.h"
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#include "vfs.h"
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#define FAT32_SECTOR_SIZE 512
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#define FAT32_EOC 0x0FFFFFFF
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#define FAT32_EOC_MIN 0x0FFFFFF8
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#define FAT32_FREE_CLUSTER 0x00000000
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#define FAT32_BAD_CLUSTER 0x0FFFFFF7
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#define FAT32_CLUSTER_MASK 0x0FFFFFFF
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#define FAT32_FSINFO_LEAD_SIG 0x41615252
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#define FAT32_FSINFO_STRUCT_SIG 0x61417272
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#define FAT32_FSINFO_TRAIL_SIG 0xAA550000
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#define FAT_ATTR_READ_ONLY 0x01
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#define FAT_ATTR_HIDDEN 0x02
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#define FAT_ATTR_SYSTEM 0x04
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#define FAT_ATTR_VOLUME_ID 0x08
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#define FAT_ATTR_DIRECTORY 0x10
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#define FAT_ATTR_ARCHIVE 0x20
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#define FAT_ATTR_LONG_NAME 0x0F
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typedef struct __attribute__((packed)) {
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uint8_t bs_jmp[3];
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uint8_t bs_oem[8];
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uint16_t bpb_bytes_per_sector;
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uint8_t bpb_sectors_per_cluster;
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uint16_t bpb_reserved_sectors;
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uint8_t bpb_num_fats;
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uint16_t bpb_root_entries;
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uint16_t bpb_total_sectors_16;
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uint8_t bpb_media;
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uint16_t bpb_fat_size_16;
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uint16_t bpb_sectors_per_track;
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uint16_t bpb_num_heads;
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uint32_t bpb_hidden_sectors;
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uint32_t bpb_total_sectors_32;
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uint32_t bpb_fat_size_32;
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uint16_t bpb_ext_flags;
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uint16_t bpb_fs_version;
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uint32_t bpb_root_cluster;
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uint16_t bpb_fs_info;
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uint16_t bpb_backup_boot;
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uint8_t bpb_reserved[12];
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uint8_t bs_drive_num;
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uint8_t bs_reserved1;
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uint8_t bs_boot_sig;
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uint32_t bs_vol_id;
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uint8_t bs_vol_label[11];
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uint8_t bs_fs_type[8];
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uint8_t bs_boot_code[420];
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uint16_t bs_signature;
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} fat32_bpb_t;
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_Static_assert(sizeof(fat32_bpb_t) == 512, "fat32 bpb size");
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typedef struct __attribute__((packed)) {
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uint32_t lead_sig;
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uint8_t reserved1[480];
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uint32_t struct_sig;
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uint32_t free_count;
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uint32_t next_free;
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uint8_t reserved2[12];
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uint32_t trail_sig;
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} fat32_fsinfo_t;
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_Static_assert(sizeof(fat32_fsinfo_t) == 512, "fat32 fsinfo size");
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typedef struct __attribute__((packed)) {
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uint8_t name[11];
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uint8_t attr;
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uint8_t nt_reserved;
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uint8_t create_time_tenth;
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uint16_t create_time;
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uint16_t create_date;
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uint16_t access_date;
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uint16_t cluster_hi;
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uint16_t modify_time;
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uint16_t modify_date;
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uint16_t cluster_lo;
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uint32_t file_size;
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} fat32_dirent_t;
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_Static_assert(sizeof(fat32_dirent_t) == 32, "fat32 dirent size");
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typedef struct __attribute__((packed)) {
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uint8_t order;
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uint8_t name1[10];
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uint8_t attr;
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uint8_t type;
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uint8_t checksum;
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uint8_t name2[12];
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uint16_t cluster_lo;
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uint8_t name3[4];
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} fat32_lfn_t;
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_Static_assert(sizeof(fat32_lfn_t) == 32, "fat32 lfn size");
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typedef struct {
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blkdev_t *dev;
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uint32_t bytes_per_sector;
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uint32_t sectors_per_cluster;
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uint32_t bytes_per_cluster;
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uint32_t reserved_sectors;
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uint32_t num_fats;
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uint32_t fat_size_sectors;
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uint32_t total_sectors;
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uint32_t root_cluster;
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uint32_t first_fat_sector;
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uint32_t first_data_sector;
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uint32_t total_clusters;
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uint32_t fsinfo_sector;
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uint32_t next_free_hint;
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uint32_t free_count;
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bool dirty;
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bool readonly;
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uint8_t *shared_buf;
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} fat32_t;
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typedef struct {
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fat32_t *fs;
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uint32_t first_cluster;
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uint32_t dir_cluster;
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uint32_t dir_entry_offset;
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uint32_t file_size;
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uint8_t attr;
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uint32_t cached_cluster;
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uint32_t cached_index;
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bool size_dirty;
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uint8_t *io_buf;
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} fat32_vdata_t;
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int fat32_format(blkdev_t *dev, const char *label);
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vnode_t *fat32_mount(blkdev_t *dev);
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void fat32_unmount(fat32_t *fs);
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int fat32_sync(fat32_t *fs);
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#endif |