I should probably make more commits

src/dump.rs

@@ -0,0 +1,42 @@
+use std::io::Read;
+
+use fat_rs::FatFs;
+use fat_rs::fat::Fatty as _;
+
+pub fn main() -> anyhow::Result<()> {
+    let args = std::env::args();
+
+    if args.len() != 2 {
+        anyhow::bail!("usage: dump <path>");
+    }
+
+    let file = std::fs::File::open(args.skip(1).next().unwrap())?;
+
+    // let mut buf = [0; 512];
+
+    // file.read_exact(&mut buf)?;
+
+    // let bpb = Bpb::load(&buf)?;
+
+    // println!("{}", bpb);
+
+    let mut fat_fs = FatFs::load(file)?;
+
+    println!("{}", fat_fs.bpb());
+    println!();
+    println!("{}", fat_fs.fat());
+    println!();
+    println!(
+        "free clusters: {} ({} bytes)",
+        fat_fs.fat().count_free_clusters(),
+        fat_fs.fat().count_free_clusters()
+            * fat_fs.bpb().bytes_per_sector() as usize
+            * fat_fs.bpb().sectors_per_cluster() as usize
+    );
+
+    for dir_entry in fat_fs.root_dir_iter() {
+        println!("{}", dir_entry);
+    }
+
+    Ok(())
+}