fat12.h

#pragma once
 
#include <common.h>
 
#define SECTOR_SIZE 512
#define FAT_DELETED_MAGIC ((char)0xE5)
#define ENTRY_AVAILABLE 0x00
#define ENTRY_ERASED 0xe5
#define offsetof(t,d) __builtin_offsetof(t, d)
typedef uint32_t addr_t;
typedef struct {
    uint8_t  jump_code[3];              
    char     oem_name[8];               
    uint16_t bytes_per_sector;          
    uint8_t  sectors_per_cluster;       
    uint16_t reserved_sectors;          
    uint8_t  fat_count;                 
    uint16_t root_dir_capacity;         
    uint16_t logical_sectors16;         
    uint8_t  media_type;                
    uint16_t sectors_per_fat;           
    uint16_t chs_sectors_per_track;     
    uint16_t chs_tracks_per_cylinder;   
    uint32_t hidden_sectors;            
    uint32_t logical_sectors32;         
    uint8_t  media_id;                  
    uint8_t  chs_head;                  
    uint8_t  ext_bpb_signature;         
    uint32_t serial_number;             
    char     volume_label[11];      
    char     fsid[8];               
    uint8_t  boot_code[448];        
    uint16_t magic;                 
} __attribute__((__packed__)) FAT_BOOT_SECTOR;
 
 
typedef struct{
    uint8_t READONLY: 1,
    HIDDEN: 1,
    SYSTEN: 1,
    VOLUMEID: 1,
    DIR: 1,
    ARCHIVE: 1,
    _reserved: 2;
}__attribute__((__packed__)) fat_attributes;
 
 
typedef struct{
    char Name[11];                      
    fat_attributes Attr;                
    uint8_t Reser;                      
    uint8_t TimeMS;                     
    uint16_t TimeCreateHIS;             
    uint16_t TimeCreateDate;            
    uint16_t TimeAccess;                
    uint16_t FCHB;                      
    uint16_t TimeEditHIS;               
    uint16_t TimeEditDate;              
    uint16_t FCLB;                      
    uint32_t Size;                      
} FAT_ENTRY;
 
struct dir_entry_t{
    char name[13];
    uint32_t size;
    uint8_t is_archived: 1;
    uint8_t is_readonly: 1;
    uint8_t is_system: 1;
    uint8_t is_hidden: 1;
    uint8_t is_directory: 1;
};
 
struct disk_t{
    FILE* pdisk;
    int32_t sec_count;
};
 
struct volume_t {
    FAT_BOOT_SECTOR super;
    uint32_t fat1_pos;
    uint32_t root_pos;
    uint32_t root_sectors;
    uint32_t cluster2_pos;
    struct disk_t* disk;
    uint32_t* fat_table;
};
 
struct file_t{
    FAT_ENTRY *entry;
    struct volume_t* volume;
    uint32_t offset;
};
struct dir_t{
    FAT_ENTRY * entries;
    uint32_t capactiy;
    uint32_t offset;
    struct volume_t* volume;
};