Espresso/include/fs/ramfs.h

#ifndef _RAM_FS_H
#define _RAM_FS_H

#include <types.h>

#define RAMFS_FILENAME_LEN 32

#define RAMFS_PERM_READ   0x01
#define RAMFS_PERM_WRITE  0x02
#define RAMFS_PERM_EXEC   0x04
#define RAMFS_PERM_ALL    (RAMFS_PERM_READ | RAMFS_PERM_WRITE | RAMFS_PERM_EXEC)

#define RAMFS_FILE_DIR    'd'
#define RAMFS_FILE_TEXT   't'
#define RAMFS_FILE_BINARY 'b'
#define RAMFS_FILE_LINK   'l'
#define RAMFS_FILE_NOFILE 'n'

#define RAMFS_ENCR_NONE   'n'
#define RAMFS_ENCR_SIMPLE 's'

typedef struct ramfs_file_header {
  char filename[RAMFS_FILENAME_LEN + 1];
  char type;
  char encryption;
  
  struct ramfs_file_header* content;
  struct ramfs_file_header* parent;
  struct ramfs_file_header* next;
  struct ramfs_file_header* link_target;
  
  void* data_begin;
  void* data_end;
  
  int32_t read_offset;
  
  int32_t fd;
} ramfs_file_header_t;

void ramfs_init(void);

ramfs_file_header_t* ramfs_make_root(void);
ramfs_file_header_t* ramfs_get_root(void);
int32_t ramfs_get_files(void);
bool ramfs_get_initialized(void);

ramfs_file_header_t* ramfs_resolve_path(const char* path);
ramfs_file_header_t* ramfs_resolve_fd_dir(ramfs_file_header_t* current, int32_t fd);
ramfs_file_header_t* ramfs_resolve_fd(int32_t fd);

ramfs_file_header_t* ramfs_create_file(char* name, char type, char encryption, ramfs_file_header_t* parent);
int32_t ramfs_delete_file(ramfs_file_header_t* file);
ramfs_file_header_t* ramfs_write_file(ramfs_file_header_t* file, void* data, size_t len);
int32_t ramfs_read_file(ramfs_file_header_t* file, void* buffer, size_t buffer_len);

#endif