1 files changed, 168 insertions, 0 deletions
diff --git a/src/disk/block.rs b/src/disk/block.rs
new file mode 100644
index 0000000..d287ee6
--- /dev/null
+++ b/src/disk/block.rs
@@ -0,0 +1,168 @@
+use crate::disk::inode::Inode;
+
+pub trait Block: Default + Clone {}
+
+#[derive(Clone)]
+pub struct DataBlock(pub(crate) [u8; 4096]);
+
+impl Default for DataBlock {
+    fn default() -> Self {
+        Self([0; 4096])
+    }
+}
+
+impl Block for DataBlock {}
+
+#[derive(Clone)]
+pub struct InodeBlock {
+    pub(crate) inodes: [Inode; 16],
+}
+
+impl Default for InodeBlock {
+    fn default() -> Self {
+        Self {
+            inodes: [
+                Inode::empty(),
+                Inode::empty(),
+                Inode::empty(),
+                Inode::empty(),
+                Inode::empty(),
+                Inode::empty(),
+                Inode::empty(),
+                Inode::empty(),
+                Inode::empty(),
+                Inode::empty(),
+                Inode::empty(),
+                Inode::empty(),
+                Inode::empty(),
+                Inode::empty(),
+                Inode::empty(),
+                Inode::empty(),
+            ],
+        }
+    }
+}
+
+impl Block for InodeBlock {}
+
+const FULL_MAP: u32 = 0b111_111_111_111_111;
+
+#[derive(Clone)]
+pub struct DirectoryBlock {
+    entries: [[u8; 256]; 15],
+    inode_ids: [usize; 15],
+    occupancy_map: u32,
+    reserved: [u8; 132],
+}
+
+impl Default for DirectoryBlock {
+    fn default() -> Self {
+        Self {
+            entries: [[0; 256]; 15],
+            inode_ids: [0; 15],
+            occupancy_map: 0,
+            reserved: [0xFF; 132],
+        }
+    }
+}
+
+impl Block for DirectoryBlock {}
+
+impl DirectoryBlock {
+    fn vacant(&self) -> bool {
+        self.occupancy_map & FULL_MAP != FULL_MAP
+    }
+
+    fn first_free(&self) -> Option<usize> {
+        todo!()
+    }
+
+    fn mark_busy(&mut self, entry_id: usize) {
+        todo!()
+    }
+
+    /// 需要判断 entry_name.len() <= 255
+    pub fn write_entry(&mut self, entry_name: &[u8], entry_inode_id: usize) -> Option<usize> {
+        if let Some(entry_id) = self.first_free() {
+            self.mark_busy(entry_id);
+            self.entries[entry_id].copy_from_slice(entry_name);
+            self.inode_ids[entry_id] = entry_inode_id;
+            Some(entry_id)
+        } else {
+            None
+        }
+    }
+}
+
+#[derive(Clone)]
+pub struct IndirectBlock {
+    pub entries: [u32; 1024],
+}
+
+impl Default for IndirectBlock {
+    fn default() -> Self {
+        Self { entries: [0; 1024] }
+    }
+}
+
+impl Block for IndirectBlock {}
+
+impl IndirectBlock {
+    pub fn full(&self) -> bool {
+        todo!()
+    }
+
+    pub fn allocate(&mut self) -> Option<usize> {
+        todo!()
+    }
+}
+
+#[derive(Clone)]
+pub struct DoubleIndirectBlock {
+    pub indirect: [u32; 1024],
+}
+
+impl Default for DoubleIndirectBlock {
+    fn default() -> Self {
+        Self {
+            indirect: [0; 1024],
+        }
+    }
+}
+
+impl Block for DoubleIndirectBlock {}
+
+impl DoubleIndirectBlock {
+    pub fn full(&self) -> bool {
+        todo!()
+    }
+
+    pub fn allocate(&mut self) -> Option<usize> {
+        todo!()
+    }
+}
+
+#[derive(Clone)]
+pub struct TripleIndirectBlock {
+    pub double_indirect: [u32; 1024],
+}
+
+impl Default for TripleIndirectBlock {
+    fn default() -> Self {
+        Self {
+            double_indirect: [0; 1024],
+        }
+    }
+}
+
+impl Block for TripleIndirectBlock {}
+
+impl TripleIndirectBlock {
+    pub fn full(&self) -> bool {
+        todo!()
+    }
+
+    pub fn allocate(&mut self) -> Option<usize> {
+        todo!()
+    }
+}