File-System-in-OS/FAT12.h at main · CarolYeh910/File-System-in-OS · GitHub

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#pragma pack(push)
#pragma pack(1)

struct Fat12MBR {
    char jump[3];
    char BS_OEMName[8];
    unsigned short BPB_BytsPerSec;
    unsigned char BPB_SecPerClus;
    unsigned short BPB_RsvdSecCnt;
    unsigned char BPB_NumFATs;
    unsigned short BPB_RootEntCnt;
    unsigned short BPB_TotSec16;
    unsigned char BPB_Media;
    unsigned short BPB_FATSz16;
    unsigned short BPB_SecPerTrk;
    unsigned short BPB_NumHeads;
    unsigned int BPB_HiddSec;
    unsigned int BPB_TotSec32;
    unsigned char BS_DrvNum;
    unsigned char BS_Reserved1;
    unsigned char BS_BootSig;
    unsigned int BS_VolID;
    char BS_VolLab[11];
    char BS_FileSysType[8];
};

struct entry {
    char DIR_Name[11];
    unsigned char DIR_Attr;
    unsigned char reserve[10];
    unsigned short DIR_WrtTime;
    unsigned short DIR_WrtDate;
    unsigned short DIR_FstClus;
    unsigned int DIR_FileSize;
};

#pragma pack(pop)

struct node {
    entry obj;
    bool dir;
    int offset;
    node* prev;
    node* next;
    node* down;
    node(): dir(false), offset(0), prev(NULL), next(NULL), down(NULL) {}
};


void PrintMBR(char* MBR);
void fat12(char* img, int size);
char* cd(char* param, char* header, node** now, node* roots, int cnt);
void dir(char* img, char* param, char* header, node* now, node* roots, int cnt);
void mkdir(char* img, char* param, node* roots, int& cnt, node* now);
void rmdir(char* img, char* param, node* roots, int cnt, node* now);
void type(char* img, char* param, node* roots, int cnt, node* now);
void del(char* img, char* param, node* roots, int cnt, node* now);
void copy(char* img, char* param, node* roots, int& cnt, node* now);
void help();


int find_roots(node* roots, char* img);
void find_sub_entry(node* root, char* img);
int tree(node* roots, char* img);
void show_tree(node* roots, int cnt, node* now);
void clear_tree(node* roots, int cnt);


node* path_analyze(char* param, node* roots, int cnt, node* now);
void PrintEntry(entry obj, int& num, int& size);
void edit_roots(char* img, node* roots, int &cnt, int& pos, int size);
void edit_sub_dir(char* img, node* dir, node* tmp);
void edit_empty_dir(char* img, node* now, int cls_num);
void input(char* buffer, int size, int& length);
node* find_dir(char* param, node* roots, int cnt, node* now);
node* find_file(node* roots, int cnt, node* dir);
void edit_entry(char* img, node* obj);


void read_fat(char* img, int* chain, int &num);
void empty_fat(char* img, int init);
void find_0_fat(char* img, int* chain, int num);
void edit_fat(char* img, int* chain, int num);
void read_block(char* img, char* block, int num, bool cls);
void write_block(char* img, char* block, int num, bool cls);


void date(unsigned short days);
void time(unsigned short time);
void getdate(unsigned short &days);
void gettime(unsigned short &times);