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#ifndef __FD_H__
#define __FD_H__
#include "types.h"
#define FD_MAX 32
#define OPEN_READ 0x1
#define OPEN_WRITE 0x2
#define OPEN_BIN 0x4
#define OPEN_APPEND 0x8
#define OPEN_ERASE 0x10
#define OPEN_DIR 0x20
#define OPEN_LINK 0x40
#define LS_ALL 0x1
/* declare dirent, not include */
#ifndef __DIRENT_H__
struct dirent;
#endif
/* set of operations callback for fd */
struct fd_operations
{
size_t (*readline)(inode_t, fsize_t, char *, char term);
size_t (*print)(inode_t, fsize_t, const char *);
size_t (*append)(inode_t, fsize_t*, const char *);
size_t (*read)(inode_t, fsize_t, void *, size_t);
size_t (*write)(inode_t, fsize_t, const void *, size_t);
size_t (*bin_append)(inode_t, fsize_t*, const void *, size_t);
size_t (*ls)(inode_t, struct dirent *, uint8_t);
size_t (*find)(inode_t, struct dirent *, const char *);
int8_t (*mkdir)(inode_t, const char *);
int8_t (*rmdir)(inode_t, const char *);
int8_t (*touch)(inode_t, const char *);
int8_t (*rm)(inode_t, const char *);
int8_t (*ln)(inode_t, const char *, const char *);
int8_t (*special)(inode_t, void *, size_t);
};
/* file descriptor */
struct file_desc
{
inode_t inode; // inode pointed
fsize_t seek; // virtual seek
devsize_t begin; // beginning of blocks
struct fd_operations opers; // bound operations
};
/* bitmap of used file descriptors */
extern struct uint8_t fd_bmap[FD_TABLE_SIZE / 8];
/* table of file descriptors */
extern struct file_desc fd_table[FD_TABLE_SIZE];
/* returns a free file descriptor */
int8_t __fd_new();
/* opens a file streaming of the cwd */
int8_t __open_c_inode(uint8_t flags);
/* opens a file streaming by a path */
int8_t open(const char *path, uint8_t flags);
/* list content of directory */
size_t ls(int8_t fd, struct dirent *buf, uint8_t all);
/* find name through the directory entries */
size_t find(int8_t fd, struct dirent *buf, const char *name);
/* creates a new directory inside fd with the specified name */
int8_t mkdir(int8_t fd, const char *name);
/* creates a new file inside fd with the specified name */
int8_t touch(int8_t fd, const char *name);
/* creates a new symlink inside fd with the specified name */
int8_t ln(int8_t fd, const char *name);
/* change virtual seek position of the fd */
int8_t seek(int8_t fd, fsize_t pos);
/* reads a string from the fd until the terminator is reached */
size_t readline(int8_t fd, char *buf, char term);
/* writes a string into the fd */
int8_t print(int8_t fd, const char *str);
/* reads n bytes from the fd */
size_t read(int8_t fd, void *buf, size_t n);
/* writes n bytes into the fd */
int8_t write(int8_t fd, const void *buf, size_t n);
/* frees fd space */
void close(int8_t fd);
#endif // __FD_H__
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