//
// Created by rick on 07-02-21.
//

#include "fat.h"

#include <types.h>

typedef struct {
    struct {
        u8 jump[3];
        char oem_identifier[8];
        u16 bytes_per_sector;
        u8 sectors_per_cluster;
        u16 reserved_sectors;
        u8 fats;
        u16 directories;
        u16 total_sectors;
        u8 media_descriptor;
        u16 sectors_per_fat;
        u16 sectors_per_track;
        u16 heads_sides;
        u32 hidden_sectors;
        u32 large_sector_count;
    } bpb;
    union {
        struct {
            u8 drive_number;
            u8 flags;
            u8 signature;
            u32 serial;
            u8 label[11];
            u8 system_id[8];
        } ebr_12_16;
        struct {
            u32 sectors_per_fat;
            u16 flags;
            u16 fat_version;
            u32 root_directory;
            u16 fs_info;
            u16 backup_boot;
            u8 reserved[12];
            u8 drive_number;
            u8 flags_nt;
            u8 signature;
            u32 serial;
            u8 label[11];
            u8 system_id[8];
        } ebr_32;
    };
} fat_bpb;

// steal validation code from here https://github.com/torvalds/linux/blob/fcadab740480e0e0e9fa9bd272acd409884d431a/fs/fat/inode.c#L1456