filesys.h

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/////////////////////////////////////////////////////////////
//FileName		: filesys.h
//
//Creator		: Fang Wenbin(0410706)
//CreateTime	: 2006-12-26
//
//File Desc:
//	1. s_SuperBlock -- super block of file system
//	2. FileSystem -- the upper layer of filesystem, provides 
//					a higher level operations of files.
/////////////////////////////////////////////////////////////
#ifndef FS_H
#define FS_H

#include "copyright.h"
#include "openfile.h"

class SynchDisk;
///
///stores file system's parameters
///
class s_SuperBlock
{
	public:
		s_SuperBlock();
		~s_SuperBlock();
		void Init();
				
		short numOfInodes;			//in this DISK, values 256
		short numOfZones;			//in this DISK, values 1024
		short numOfZmapBlocks;		//in this DISK, values 1
		short numOfImapBlocks;		//in this DISK, values 1
		short firstDataBlock;		//in this DISK, values 67
		int   limitOfFile;			//in this DISK, values 2mb
		short firstImapBlock;		//in this DISK, values 1
		short firstZmapBlock;		//in this DISK, values 2
		short numOfDataBlocks;		//in this DISK, values 
		short sizeOfInode;			//in this DISK, values 32
		short sizeOfDirEntry;		//in this DISK, values 16
		short numOfInodeBlocks;		//in this DISK, values 64
		short firstInodeBlock;		//in this DISK, values 3
};

#ifdef FILESYS_STUB 
class FileSystem {
  public:
    FileSystem(bool format) {}

    bool Create(char *name, int initialSize) { 
	int fileDescriptor = OpenForWrite(name);

	if (fileDescriptor == -1) return FALSE;
	Close(fileDescriptor); 
	return TRUE; 
	}

    OpenFile* Open(char *name) {
	  int fileDescriptor = OpenForReadWrite(name, FALSE);

	  if (fileDescriptor == -1) return NULL;
	  return new OpenFile("");
      }

    bool Remove(char *name) { return Unlink(name) == 0; }

};

#else // FILESYS
///
///the main class of file system
///higher level operations of files
///
class FileSystem {
  public:
    FileSystem(bool format);		
	~FileSystem();

	void s_CreateFile(char *filePath);
	void s_CreateDir(char *filePath);
	void s_WriteFile(char *filePath, int size, char *data);
	void s_ReadFile(char *filePath, int size, char *data);
	int  s_GetFileLength(char *filePath);
	void s_RemoveFile(char *filePath);
	int s_GetFileType(char *filePath);

	void s_CopyFile(char *src, char *des);
	void s_RenameFile(char *src, char *des);
	void s_List(char *dir);

	s_SuperBlock *s_superBlock;		//super block	
	SynchDisk *s_synchDisk;	
};

#endif // FILESYS

#endif // FS_H