/***************************************************************************                          para.h  -  description                             -------------------    begin                : Wed Jul 23 2003    copyright            : (C) 2003 by Jeremy    email                : zhiming_z@hotmail.com ***************************************************************************/#ifdef HAVE_CONFIG_H#include <config.h>#endif#include <iostream.h>#include <iomanip.h>#include <stdlib.h>#include <math.h>#include <sys/types.h>#include <stdio.h>#include <sys/stat.h>#include <fcntl.h>#include <string.h>#include <unistd.h>#define NULL 0#define FLEN sizeof (file_node)#define NAME_LENGTH 8#define SEEK_SET 0#define OFF_SET 9728#define BPS 512#define FILE_EMPTY 0#define FILE_DEL 229#define INP_LEN  12 //the length of command or filename that you inpur in your commands/* start of struct and class*/struct file_node{	char file_name[8], ext_name[3];	int readonly,hidden,system,isdir,isfile;/* and ithers*/	int hour,minute,second;	int year,month,day;	int start_cluster;	int file_length;	struct file_node *prev, *next,*down;	int num_cluster;	//there is no such ones in linux ,use this to record the cluster where the direntry is	int num_index;		//and this to record the index of the file at one cluster(from 0 to 15)};struct super_block{	int sector_p_cluster;  		 //1 in fat12	int num_fat;							 //2 in fat12	int num_root_dir_entry;		//14 in fat12	int num_log_sector;			//logic numbers 2880 in fat12 11*256+64	int sector_p_fat;					//09 in fat12	int num_hid_sector;			//	int other_use_sector;			//1 in fat12};class perbyte		/*use this class to change one unsigned char to 10 and ASCII*/{	public:		unsigned char b_input,b_output;unsigned char buf[BPS];		unsigned binary[8];		int l_10,h_10;		perbyte(unsigned char temp);		~perbyte();};perbyte::perbyte(unsigned char temp){	unsigned a,b,c,d=15;	// d/15 is 0000,1111 in binary	unsigned w0=128,w1=64,w2=32,w3=16,w4=8,w5=4,w6=2,w7=1;	b_input=(unsigned char)'\0';b_output=(unsigned char)'\0';	b_input=temp;		if (((b_input>64)&&(b_input<91))||((b_input>96)&&(b_input<128)))		b_output=b_input;	else	b_output='.';	//the word can't be shown will putout . instead	c=b_input;	a=c>>4;			//move four bits to the right then a is the four bits of the higher one	b=c&d;			//b is the four bits of the lower one	h_10=(int)a;	l_10=(int)b;	//binary[i] is designed for the attrib byte	binary[0]=w0&temp;binary[0]=binary[0]>>7;	binary[1]=w1&temp;binary[1]=binary[1]>>6;	binary[2]=w2&temp;binary[2]=binary[2]>>5;	binary[3]=w3&temp;binary[3]=binary[3]>>4;	binary[4]=w4&temp;binary[4]=binary[4]>>3;	binary[5]=w5&temp;binary[5]=binary[5]>>2;	binary[6]=w6&temp;binary[6]=binary[6]>>1;	binary[7]=w7&temp;	}perbyte::~perbyte(){//cout<<"you"<<endl;}/* end of struct and class*/struct file_node *head,*cur_head,*head_per_cluster,*p_end;struct super_block sb_fat12;unsigned char buffer[BPS];off_t offset=9728;  ///????????int fid;int clu_num,form_clu_num;int log_num,form_log_num;