filesys.h

Linux下简单文件系统的操作 具体可以实现目录得建立删除等等功能

#ifndef FILESYS_H
#define FILESYS_H

#define DEVNAME "/dev/fd0H1440"

#define DIR_ENTRY_SIZE 32 
#define SECTOR_SIZE    512
#define FAT_ONE_OFFSET 0x200 
#define FAT_TWO_OFFSET 0x1400 
#define ROOTDIR_OFFSET 0x2600 
#define DATA_OFFSET    0x4200 

/* mask for the entry attribute */ 
#define ATTR_READONLY 0x01 
#define ATTR_HIDDEN   0x02
#define ATTR_SYSTEM   0x04
#define ATTR_VLABEL   0x08
#define ATTR_SUBDIR   0x10
#define ATTR_ARCHIVE  0x20

/* mask for time 5:6:5*/
#define MASK_HOUR     0xf800
#define MASK_MIN      0x07e0
#define MASK_SEC      0x001f

/* mask for date 7:4:5*/
#define MASK_YEAR     0xfe00
#define MASK_MONTH    0x01e0
#define MASK_DAY      0x001f

struct BootDescriptor_t { 
unsigned char Oem_name[9];     
int BytesPerSector;           
int SectorsPerCluster;       
int ReservedSectors;         
int FATs;                      
int RootDirEntries;           

int LogicSectors;       
int MediaType;              
int SectorsPerFAT;          
int SectorsPerTrack;          
int Heads;                     
int HiddenSectors;            
};

struct Entry { 
unsigned char short_name[12]; 
unsigned char long_name[27];  
unsigned short hour,min,sec;  
unsigned short year,month,day; 
unsigned short FirstCluster;   
unsigned int size;          
unsigned char readonly:1;    
unsigned char hidden:1;       
unsigned char system:1;    
unsigned char vlabel:1;    
unsigned char subdir:1;     
unsigned char archive:1;    
};

int fd_load();
int fd_ls();
int fd_cd(char *dir);
int fd_rm(char *file_name);

void findDate(unsigned short *year,unsigned short *month,unsigned short *day,unsigned char info[2]);
void findTime(unsigned short *hour,unsigned short *min,unsigned short *sec,unsigned char info[2]);

int  ReadFat();
int  WriteFat();
void ScanBootSector();
void ScanRootEntry();
int  ScanEntry(char *entryname,struct Entry *pentry,int mode); 
int  GetEntry(struct Entry *entry);
void FileNameFormat(unsigned char *name);
unsigned short GetFatCluster(unsigned short prev);
void ClearFatCluster(unsigned short cluster);

#endif