directory.h

操作系统课程设计。在UNIX平台下实现Solary操作系统的一些功能

/////////////////////////////////////////////////////////////
//FileName		: directory.h
//
//Creator		: Fang Wenbin(0410706)
//CreateTime	: 2006-12-26
//
//File Desc:
//	the header of directory.cc, implement the operations of 
//	file or directory.
/////////////////////////////////////////////////////////////

#include "copyright.h"

#ifndef DIRECTORY_H
#define DIRECTORY_H

#include "openfile.h"

#define FileNameMaxLen 		9
				
#define s_FILE_NAME_MAX_LEN 14		//the length of filename

class s_SuperBlock;
class DirectoryEntry {
  public:
    bool inUse;			
    int sector;		
				
    char name[FileNameMaxLen + 1];	
};

///
///dir entry, which stores file name and inode index
///
class s_DirEntry
{
public:
	s_DirEntry()
	{
		for (int i = 0; i < 14; i++)
			s_name[i] = '\0';	
	}
public:
	short s_inodeIndex;						// inode index
	char s_name[s_FILE_NAME_MAX_LEN];		// file name, the max length is 14
};


class FileHeader;
///
///this class implement the basic operations of file and dir.
///including--
///1.create directory
///2.create file
///3.write file
///4.read file
///5.get file inode
///
class Directory {
  public:
	Directory(char *parentDir);
    ~Directory();		

	static	void s_CreateRoot(s_SuperBlock *super);	
	static	int s_SplitPath(char *path, char **buf);
	static  void s_SplitParentAndFile(char *path, char *parent, char *file);

	void s_CreateDir(char *dirName);
	void s_CreateFile(char *fileName);

	int s_FindIndex(FileHeader *inode, char *fileName);
	FileHeader *s_GetInode(int index);
	FileHeader *s_FindInode(char *path);
	s_DirEntry *s_FindDirEntry(char *fileName, int *slot, int *offset);

	void s_List();

	void s_WriteFile(int size, char *data);
	void s_ReadFile(int size, char *data);
	void s_Error();
	s_DirEntry *s_GetLastEntry();

	
	int			dirHdrIndex;		//this file's inode index
	char		*dirPath;			//this file's filename
	bool		error;				//error indicator, true--come across an error, otherwise, false
	FileHeader	*dirHdr;			//this file's inode
};

#endif // DIRECTORY_H