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cluster 0 as 'empty' marker

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Moritz Gmeiner 2025-07-31 01:13:32 +02:00
commit bdcda26d77
1 changed files with 16 additions and 0 deletions
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16
fat-bits/src/lib.rs
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@ -185,12 +185,28 @@ impl FatFs {
} }
pub fn cluster_as_subslice_mut(&mut self, cluster: u32) -> SubSliceMut<'_> { pub fn cluster_as_subslice_mut(&mut self, cluster: u32) -> SubSliceMut<'_> {
if cluster == 0 {
// for cluster 0 simply return empty subslice
// this makes things a bit easier, since cluster 0 is used as a marker that a file/dir
// is empty
SubSliceMut::new(self, 0, 0);
}
let offset = self.data_cluster_to_offset(cluster); let offset = self.data_cluster_to_offset(cluster);
SubSliceMut::new(self, offset, self.bytes_per_cluster) SubSliceMut::new(self, offset, self.bytes_per_cluster)
} }
pub fn cluster_as_subslice(&self, cluster: u32) -> SubSlice<'_> { pub fn cluster_as_subslice(&self, cluster: u32) -> SubSlice<'_> {
if cluster == 0 {
// for cluster 0 simply return empty subslice
// this makes things a bit easier, since cluster 0 is used as a marker that a file/dir
// is empty
SubSlice::new(self, 0, 0);
}
let offset = self.data_cluster_to_offset(cluster); let offset = self.data_cluster_to_offset(cluster);
SubSlice::new(self, offset, self.bytes_per_cluster) SubSlice::new(self, offset, self.bytes_per_cluster)