Allow read of filesystem names

src/header.rs

@@ -0,0 +1,47 @@
+use std::{mem, slice};
+use std::ops::{Deref, DerefMut};
+
+use super::Extent;
+
+/// The header of the filesystem
+#[repr(packed)]
+pub struct Header {
+    pub signature: [u8; 8],
+    pub version: u64,
+    pub free_space: Extent,
+    pub padding: [u8; 224],
+    pub extents: [Extent; 16],
+}
+
+impl Header {
+    pub fn new() -> Header {
+        Header {
+            signature: [0; 8],
+            version: 0,
+            free_space: Extent::default(),
+            padding: [0; 224],
+            extents: [Extent::default(); 16]
+        }
+    }
+
+    pub fn valid(&self) -> bool {
+        &self.signature == b"REDOXFS\0" && self.version == 1
+    }
+}
+
+impl Deref for Header {
+    type Target = [u8];
+    fn deref(&self) -> &[u8] {
+        unsafe {
+            slice::from_raw_parts(self as *const Header as *const u8, mem::size_of::<Header>()) as &[u8]
+        }
+    }
+}
+
+impl DerefMut for Header {
+    fn deref_mut(&mut self) -> &mut [u8] {
+        unsafe {
+            slice::from_raw_parts_mut(self as *mut Header as *mut u8, mem::size_of::<Header>()) as &mut [u8]
+        }
+    }
+}