#ifndef EMBPART_FAT32_H
#define EMBPART_FAT32_H

#include <stdint.h>

typedef struct {
    uint8_t boot_jump[3]; // jump instruction used for bootable volume
    uint8_t formatter_name[8]; // identification of application or OS formatted this device
    uint16_t bytes_per_sector; // number of bytes per sector
    uint8_t sectors_per_cluster; // number of sectors per cluster
    uint16_t n_reserved_sectors; // number of reserved sectors
    uint8_t n_fats; // number of FAT copies
    uint8_t _unused0[2];
    uint8_t _unused1[2];
    uint8_t media_descriptor; // media descriptor differentiating between removable and non-removable devices
    uint8_t _unused2[2];
    uint16_t sectors_per_track; // number of sectors per track
    uint16_t n_heads; // number of heads
    uint32_t n_hidden_sectors; // number of hidden sectors preceding this volume
    uint32_t n_total_sectors; // total number of sectors in this volume
    uint32_t n_sectors_per_fat; // number of sectors per FAT
    uint16_t flags; // flags, see docs.
    uint16_t version; // FAT version number
    uint32_t root_first_cluster; // first cluster of the root directory
    uint16_t fsinfo_sector; // sector of the FSINFO structure
    uint16_t boot_backup_sector; // sector of backup boot code in the reserved region
    uint8_t _reserved0[12];
    uint8_t logical_driver_number; // logical drive number of the partition
    uint8_t _reserved1;
    uint8_t extended_boot_signature; // extended boot signature
    uint32_t volume_serial_number; // volume serial number
    uint8_t volume_label[11]; // volume label string
    uint8_t fs_type[8]; // file system type ("FAT32")
} __attribute__((packed)) Bpb_Fat32;

typedef struct {
    uint32_t bpb_s; // sector of bios parameter block
    uint32_t fat_s; // first sector of the FAT area
    uint32_t root_s; // first sector of root directory
    uint32_t data_s; // first sector of the data area (~volume)
    uint32_t serial_number; // serial number of the volume
    uint32_t sectors_per_fat; // sectors per FAT table
    uint16_t bytes_per_sector; // number of bytes creating a sector
    uint16_t sectors_per_cluster; // number of sectors creating a cluster
    uint8_t fat_copies; // number of FAT table copies
    uint8_t volume_label[11]; // pointer to volume label
} Fat32_CtrlBlock;

int fat32_load(Fat32_CtrlBlock *ctrl, const uint8_t *bpb, uint32_t bpb_s);

#endif //EMBPART_FAT32_H