file.h

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#pragma once
 
#include <stdint.h>
#include "drivers/disk/disk.h"
#include "Path.hpp"
 
#define MAX_FILESYSTEMS 12
#define MAX_FILEDESCRIPTORS 1024
#define MAX_FILESYSTEM_NAME 20
#define MAX_MOUNTED 16384
 
typedef unsigned int FILE_SEEK_MODE;
typedef unsigned int FILE_MODE;
typedef unsigned int FILE_STAT_FLAGS;
 
enum FILE_SEEK_MODES
{
    SEEK_SET,
 
    SEEK_CUR,
 
    SEEK_END
};
 
enum FILE_OPEN_MODES
{
    FILE_MODE_READ,
    FILE_MODE_WRITE,
    FILE_MODE_APPEND,
    FILE_MODE_INVALID
};
 
enum FILE_STAT_FLAGS_ENUM
{
    FILE_STAT_READ_ONLY = 0b00000001,
    FILE_STAT_FOLDER = 0b00000010
};
 
struct file_descriptor
{
    int index;
    struct filesystem* filesystem;
    void* private_fs_descriptor;
    void* private_fs;
};
 
struct file_stat
{
    FILE_STAT_FLAGS flags;
    uint32_t filesize;
};
 
typedef int (*FS_RESOLVE_FUNCTION)(struct disk* disk);
typedef void* (*FS_OPEN_FUNCTION)(void* private_fs, struct path_part* path, FILE_MODE mode);
typedef int (*FS_READ_FUNCTION)(void* private_fs, void* descriptor, uint32_t size, uint32_t nmemb, char* out);
typedef int (*FS_SEEK_FUNCTION)(void* private_fs, uint32_t offset, FILE_SEEK_MODE seek_mode);
typedef int (*FS_STAT_FUNCTION)(void* private_fs, struct file_stat* stat);
typedef int (*FS_CLOSE_FUNCTION)(void* private_fs);
typedef int (*FS_WRITE_FUNCTION)(void* private_fs, void* descriptor, uint32_t size, uint32_t nmemb, char* in);
 
 
struct filesystem
{
    FS_RESOLVE_FUNCTION resolve;
    FS_OPEN_FUNCTION open;
    FS_READ_FUNCTION read;
    FS_SEEK_FUNCTION seek;
    FS_STAT_FUNCTION stat;
    FS_CLOSE_FUNCTION close;
    FS_WRITE_FUNCTION write;
 
    char name[MAX_FILESYSTEM_NAME];
};
 
void fs_init();
void fs_insert_filesystem(struct filesystem* filesystem);
struct filesystem* fs_resolve(struct disk* disk);
 
int fopen(const char* filename, const char* mode);
int fread(void* ptr, uint32_t size, uint32_t nmemb, int fd);
int fwrite(void* ptr, uint32_t size, uint32_t nmemb, int fd);
int fseek(int fd, int offset, FILE_SEEK_MODE whence);
int fstat(int fd, struct file_stat* stat);
int fclose(int fd);
 
struct mounted_file {
    const char* filename;
    struct filesystem* fs;
    void* data;
};
 
void mount(const char* filename, struct filesystem* fs, void* data);