From 77be6dd9d02507a15273574db93071b87fdb0fd7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Harabie=C5=84?= <rafalh92@outlook.com>
Date: Mon, 22 Oct 2018 21:39:21 +0200
Subject: [PATCH] Fix build

---
 src/fs.rs | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/src/fs.rs b/src/fs.rs
index f1b3756..f28695f 100644
--- a/src/fs.rs
+++ b/src/fs.rs
@@ -332,6 +332,36 @@ impl BiosParameterBlock {
             self.total_sectors_16 as u32
         }
     }
+
+    fn root_dir_sectors(&self) -> u32 {
+        let root_dir_bytes = self.root_entries as u32 * DIR_ENTRY_SIZE as u32;
+        (root_dir_bytes + self.bytes_per_sector as u32 - 1) / self.bytes_per_sector as u32
+    }
+
+    fn sectors_per_all_fats(&self) -> u32 {
+        self.fats as u32 * self.sectors_per_fat()
+    }
+
+    fn first_data_sector(&self) -> u32 {
+        let root_dir_sectors = self.root_dir_sectors();
+        let fat_sectors = self.sectors_per_all_fats();
+        self.reserved_sectors as u32 + fat_sectors + root_dir_sectors
+    }
+
+    fn total_clusters(&self) -> u32 {
+        let total_sectors = self.total_sectors();
+        let first_data_sector = self.first_data_sector();
+        let data_sectors = total_sectors - first_data_sector;
+        data_sectors / self.sectors_per_cluster as u32
+    }
+
+    fn fat_entries_per_sector(&self, fat_type: FatType) -> u16 {
+        match fat_type {
+            FatType::Fat12 => self.bytes_per_sector * 8 / 12,
+            FatType::Fat16 => self.bytes_per_sector * 8 / 16,
+            FatType::Fat32 => self.bytes_per_sector * 8 / 32,
+        }
+    }
 }
 
 #[allow(dead_code)]