fireOS/fat.h at master · Firewiz/fireOS · GitHub

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#ifndef FAT32_H
#define FAT32_H

struct fat_fs {
  struct fat_bpb {
    unsigned char magic[3];
    char oem[8];
    unsigned short bps;
    unsigned char spc;
    unsigned short n_res;
    unsigned char n_fats;
    unsigned short n_dirents;
    unsigned short n_sectors;
    unsigned char mdt;
    unsigned short spf;
    unsigned short spt;
    unsigned short n_heads;
    unsigned int n_hidden;
    unsigned int l_sectors;
    struct fat_ebr {
      unsigned char dnum;
      unsigned char flags;
      unsigned char signature;
      unsigned int v_serial;
      char label[11];
      char sysid[8];
      unsigned char boot[448];
      unsigned short boot_magic;
    } __attribute__ ((packed)) ebr;
  } __attribute__ ((packed)) bpb;
  unsigned int total_sectors;
  unsigned int fat_size;
  unsigned int root_size;
  unsigned int first_data;
  unsigned int first_fat;
  unsigned int total_data;
  unsigned int total_clusters;
};

struct fat_dirent {
  char filename[11];
  unsigned char attrs;
  unsigned char res;
  unsigned char ctime_tenths;
  unsigned short ctime_hms;
  unsigned short ctime_ymd;
  unsigned short atime_ymd;
  unsigned short cluster_high;
  unsigned short mtime_hms;
  unsigned short mtime_ymd;
  unsigned short cluster_low;
  unsigned int size;
} __attribute__ ((packed));

void read_fs(struct fat_fs *);
struct fat_dirent *read_root_directory(struct fat_fs *);
void parse_filename(char fname[11], char name[8], char ext[3]);
unsigned int sector_from_fat(struct fat_fs *, unsigned short offset);
#endif