fileSystemModule.h

#include "types.h"

//constants
#define DENTRYSIZE 64 // size in bytes of dir entry
#define NAMESIZE 32

#define BLOCK_SIZE 4096 //size of a data block in bytes
#define INODE_BYTE_OFFSET 4
#define DATA_BLOCK_BYTE_OFFSET 8


//global vars
unsigned int FILESYSLOC;

//helper fuctions
int32_t read_dentry_by_name (const uint8_t* fname, dentry_t* dentry);
int32_t read_dentry_by_index (uint32_t index, dentry_t* dentry);
int32_t read_data (uint32_t inode, uint32_t offset, uint8_t* buf, uint32_t length);

//main functions
int32_t file_open (const uint8_t* filename);
int32_t file_read (int32_t fd, void* buf, int32_t nbytes);
int32_t file_write (int32_t fd, const void* buf, int32_t nbytes);
int32_t file_close (int32_t fd);
int32_t dir_open (const uint8_t* filename);
int32_t dir_read (int32_t fd, void* buf, int32_t nbytes);
int32_t dir_write (int32_t fd, const void* buf, int32_t nbytes);
int32_t dir_close (int32_t fd);