77 lines
1.7 KiB
Rust
77 lines
1.7 KiB
Rust
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
|
|
pub struct FileHandle(u16);
|
|
|
|
impl FileHandle {
|
|
pub const fn new(id: u16) -> Self {
|
|
Self(id)
|
|
}
|
|
|
|
pub const fn raw(&self) -> u16 {
|
|
self.0
|
|
}
|
|
}
|
|
|
|
pub const MAX_FILE_NAME: usize = 32;
|
|
|
|
#[derive(Debug, Clone, Copy)]
|
|
pub struct FileName {
|
|
bytes: [u8; MAX_FILE_NAME],
|
|
len: u8,
|
|
}
|
|
|
|
impl FileName {
|
|
pub fn empty() -> Self {
|
|
Self { bytes: [0; MAX_FILE_NAME], len: 0 }
|
|
}
|
|
|
|
pub fn from_bytes(src: &[u8]) -> Self {
|
|
let mut name = Self::empty();
|
|
let len = src.len().min(MAX_FILE_NAME);
|
|
name.bytes[..len].copy_from_slice(&src[..len]);
|
|
name.len = len as u8;
|
|
name
|
|
}
|
|
|
|
pub fn as_bytes(&self) -> &[u8] {
|
|
&self.bytes[..self.len as usize]
|
|
}
|
|
|
|
pub fn len(&self) -> usize {
|
|
self.len as usize
|
|
}
|
|
}
|
|
|
|
impl PartialEq<[u8]> for FileName {
|
|
fn eq(&self, other: &[u8]) -> bool {
|
|
self.as_bytes() == other
|
|
}
|
|
}
|
|
|
|
#[derive(Debug, Clone, Copy)]
|
|
pub struct DirEntry {
|
|
pub name: FileName,
|
|
pub size: usize,
|
|
pub is_dir: bool,
|
|
}
|
|
|
|
impl DirEntry {
|
|
pub fn empty() -> Self {
|
|
Self {
|
|
name: FileName::empty(),
|
|
size: 0,
|
|
is_dir: false,
|
|
}
|
|
}
|
|
}
|
|
|
|
pub trait FileSystem {
|
|
fn open(&mut self, path: &[u8]) -> Option<FileHandle>;
|
|
fn read(&mut self, handle: FileHandle, buf: &mut [u8]) -> Option<usize>;
|
|
fn write(&mut self, handle: FileHandle, buf: &[u8]) -> Option<usize>;
|
|
fn close(&mut self, handle: FileHandle);
|
|
fn list_dir(&mut self, path: &[u8], entries: &mut [DirEntry]) -> Option<usize>;
|
|
fn create(&mut self, path: &[u8]) -> Option<FileHandle>;
|
|
fn delete(&mut self, path: &[u8]) -> bool;
|
|
fn file_size(&mut self, handle: FileHandle) -> Option<usize>;
|
|
}
|