embedded-exfat

An exFAT Library in rust mainly focusing on no_std embedded system with async support

alloc is mandatory for this crate, although memory allocation is minimized, 256B for upcase table and 12B plus name size for each file or directory, and 12B for root directory.

For async scenario, enable async-std feature if std library available otherwide enable async feature

For no_std scenario, be aware that thread safety is provided by spin crate, which potenitally leads to dead lock.

Using this crate

use std::io::Write;
use exfat::error::Error;
use exfat::io::std::FileIO;
use exfat::ExFAT;
use exfat::FileOrDirectory;

let io = FileIO::open(device).map_err(|e| Error::IO(e)).unwrap();
let mut exfat = ExFAT::new(io).unwrap();
exfat.validate_checksum().unwrap();
let mut root = exfat.root_directory().unwrap();
root.validate_upcase_table_checksum().unwrap();
let mut file = match root.open().unwrap().open("test.txt").unwrap() {
FileOrDirectory::File(f) => f,
FileOrDirectory::Directory(_) => panic!("Not a file"),
};
let mut stdout = std::io::stdout();
let mut buf = [0u8; 512];
loop {
let size = file.read(&mut buf).unwrap();
stdout.write_all(&buf[..size]).unwrap();
if size < buf.len() {
break;
}
}