harddevice.h

本科作业虚拟linux操作系统下的文教系统

#ifndef HardDevice_tag
#define HardDevice_tag

#include <vector>

#include "HDblock.h"
#include "Nfile.h"

#define BLOCK_NUM 512
#define FILENAME "hddrv.hdr" 

class HardDevice  //虚拟磁盘
{
private:
	HDblock bk[BLOCK_NUM];
	//const static std::string FILENAME="hddrv.hdr";//对应文件名

	int blk_sum_num;//磁盘总块数    BLOCK_NUM

	//int inode_blk_num;//i节点所占块数  1

	int blk_free_num;//空闲块总数       BLOCK-inode_blk_num
	//int *p_blk_free;//
	//////////////std::vector<int>p_blk_free;

	//DiNode *p_inode_index;//i节点数组
	//std::vector<DiNode>p_inode_index;
	int inode_num;//inode 个数  

	Index_File *rootfile;

public:
	HardDevice(std::string  filename=FILENAME)
	{
		blk_sum_num=BLOCK_NUM;//总块数

		std::ifstream phyDev(filename.c_str(),std::ios::in|std::ios::binary);

		if(phyDev.is_open())
		{
/*			for(int i=0;i<BLOCK_NUM;i++)
			{
				//phyDev.read(bk+i,BLOCK_SIZE);
				phyDev>>bk[i];
			}
			
			//专用块中读取信息
			bk[1].readInt(&blk_free_num);
			bk[1].readInt(&inode_num);

			HDblock* p_hbk=&bk[2];
			while(1)
			{
				int tmp;
				if(p_hbk->readInt(&tmp))
				{
					p_blk_free.push_back(tmp);
					continue;
				}
				if(!(p_hbk->hasNext()))
				{
					break;
				}
				else
				{
					p_hbk=&bk[p_hbk->getNext()];
				}
			}

			p_hbk=&bk[6];
			while(1)
			{
				DiNode tmp(0,0,0);

				if(p_hbk->readDinode(&tmp))
				{
					p_inode_index.push_back(tmp);
					continue;
				}
				if(!(p_hbk->hasNext()))
				{
					break;
				}
				else
				{
					p_hbk=&bk[p_hbk->getNext()];
				}
				
			}
*/
		}
		else //新建磁盘
		{//0号块不用，从1号块开始

			blk_sum_num=BLOCK_NUM;//总块数
			//bk[1].write(blk_sum_num);

			blk_free_num=BLOCK_NUM-1-1-4-16;//空闲块数
			//bk[1].write(blk_free_num);
			for(int i=22;i<500;i++)
			{
				bk[i].setFree();
			}


			inode_num=1;// i节点数
			//bk[1].write(inode_num);
			rootfile=new Index_File ("/",getFreeBlock(),pcurUser->getUid(),NULL);

			//p_inode_index.push_back(*(rootfile->getInode()));	

		}


	}

/*	~HardDevice()
	{
		std::string filename=FILENAME;
		std::ofstream phyDev(filename.c_str(),std::ios::out|std::ios::binary);
		
		{
			//专用块中写入信息
		}

		if(phyDev.is_open())
		{
			for(int i=0;i<BLOCK_NUM;i++)
			{
				//phyDev.read(bk+i,BLOCK_SIZE);
				phyDev<<bk[i];
			}
		}


		else//新建磁盘
		{
		}


		//debug
		phyDev.close();
		system("del hddrv.hdr");

	}
	*/


	HDblock* getFreeBlock()
	{
		for(int i=22;i<500;i++)
		{
			if(bk[i].setUsed())
				return bk+i;
		}
		return 0;
	}


	Index_File*getRoot()
	{
		return rootfile;
	}

	HDblock *getBlock(int n)
	{
		return &bk[n];
	}



};

#endif