Expose bytes_per_sector and first_cluster

Author: alexkazik

CHANGELOG.md

@@ -42,6 +42,7 @@ New features:
 * Relax BPB validation by allowing non-zero values in both `total_sectors_32` and `total_sectors_16`
 * Add `strict` field in `FsOptions`, which allows disabling validation of boot signature to improve compatibility with old FAT images
 * Improve `open_dir`
+* Expose bytes_per_sector and first_cluster
 
 Bug fixes:
 * Fix formatting volumes with size in range 4096-4199 KB

src/boot_sector.rs

@@ -395,6 +395,10 @@ impl BiosParameterBlock {
         u32::from(self.sectors_per_cluster) * u32::from(self.bytes_per_sector)
     }
 
+    pub(crate) fn bytes_per_sector(&self) -> u16 {
+        self.bytes_per_sector
+    }
+
     pub(crate) fn clusters_from_bytes(&self, bytes: u64) -> u32 {
         let cluster_size = u64::from(self.cluster_size());
         ((bytes + cluster_size - 1) / cluster_size) as u32

src/dir_entry.rs

@@ -606,7 +606,9 @@ impl<'a, IO: ReadWriteSeek, TP, OCC: OemCpConverter> DirEntry<'a, IO, TP, OCC> {
         self.data.is_file()
     }
 
-    pub(crate) fn first_cluster(&self) -> Option<u32> {
+    /// Return first cluster of a entry.
+    #[must_use]
+    pub fn first_cluster(&self) -> Option<u32> {
         self.data.first_cluster(self.fs.fat_type())
     }
 

src/fs.rs

@@ -460,6 +460,12 @@ impl<IO: Read + Write + Seek, TP, OCC> FileSystem<IO, TP, OCC> {
         self.bpb.cluster_size()
     }
 
+    /// Get sector size in bytes
+    #[must_use]
+    pub fn bytes_per_sector(&self) -> u16 {
+        self.bpb.bytes_per_sector()
+    }
+
     pub(crate) fn offset_from_cluster(&self, cluster: u32) -> u64 {
         self.offset_from_sector(self.sector_from_cluster(cluster))
     }