mfs.h

/**************************************************************
* Class::  CSC-415-02 Summer 2025
* Name::Phillip Davis, Igor Tello, Jared Aung, Preet Vithani
* Student IDs::	923980431, 923043807, 922772159, 923575806 
* GitHub-Name::R3plug
* Group-Name::Team Kentucky Kernels
* Project:: Basic File System
*
* File:: mfs.h
*
* Description:: 
*	This is the file system interface.
*	This is the interface needed by the driver to interact with
*	your filesystem.
*
**************************************************************/


#ifndef _MFS_H
#define _MFS_H
#include <sys/types.h>
#include <unistd.h>
#include <time.h>

#include "b_io.h"
#include "dirLow.h"
#include <dirent.h>
#define FT_REGFILE	DT_REG
#define FT_DIRECTORY DT_DIR
#define FT_LINK	DT_LNK

#ifndef uint64_t
typedef u_int64_t uint64_t;
#endif
#ifndef uint32_t
typedef u_int32_t uint32_t;
#endif

// This structure is returned by fs_readdir to provide the caller with information
// about each file as it iterates through a directory
struct fs_diriteminfo
	{
    unsigned short d_reclen;    /* length of this record */
    unsigned char fileType;    
    char d_name[256]; 			/* filename max filename is 255 characters */
	};

// This is a private structure used only by fs_opendir, fs_readdir, and fs_closedir
// Think of this like a file descriptor but for a directory - one can only read
// from a directory.  This structure helps you (the file system) keep track of
// which directory entry you are currently processing so that everytime the caller
// calls the function readdir, you give the next entry in the directory
typedef struct
	{
	/*****TO DO:  Fill in this structure with what your open/read directory needs  *****/
	unsigned short  d_reclen;		/* length of this record */
	unsigned short	dirEntryPosition;	/* which directory entry position, like file pos */
	//DE *	directory;			/* Pointer to the loaded directory you want to iterate */
	struct fs_diriteminfo * di;		/* Pointer to the structure you return from read */
	struct DirHandle *handle;	// Pointer to loaded directory
	} fdDir;

typedef struct DirHandle
	{
		DE * entries; // pointer to the array of directory entries loaded from disk
		int totalEntries; // total number of entries loaded into memory
		int currentIndex; // current index for iterating through the entries
	} DirHandle;
	

// Key directory functions
int fs_mkdir(const char *pathname, mode_t mode);
int fs_rmdir(const char *pathname);

// Directory iteration functions
fdDir * fs_opendir(const char *pathname);
struct fs_diriteminfo *fs_readdir(fdDir *dirp);
int fs_closedir(fdDir *dirp);

// Misc directory functions
char * fs_getcwd(char *pathname, size_t size);
int fs_setcwd(char *pathname);   //linux chdir
int fs_isFile(char * filename);	//return 1 if file, 0 otherwise
int fs_isDir(char * pathname);		//return 1 if directory, 0 otherwise
int fs_delete(char* filename);	//removes a file

// This is the strucutre that is filled in from a call to fs_stat
struct fs_stat
	{
	off_t     st_size;    		/* total size, in bytes */
	blksize_t st_blksize; 		/* blocksize for file system I/O */
	blkcnt_t  st_blocks;  		/* number of 512B blocks allocated */
	time_t    st_accesstime;   	/* time of last access */
	time_t    st_modtime;   	/* time of last modification */
	time_t    st_createtime;   	/* time of last status change */
	
	/* add additional attributes here for your file system */
	};

int fs_stat(const char *path, struct fs_stat *buf);
char* mc(int size);
#endif