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fatfsgen.py: Speedup FAT cluster allocation in fatfsgen.py

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Closes IDF-5243
This commit is contained in:
Martin Gaňo
2022-06-29 15:37:06 +02:00
parent 9b87390daf
commit d56e692f2f
1 changed files with 4 additions and 1 deletions
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5
components/fatfs/fatfs_utils/fat.py
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@@ -22,6 +22,7 @@ class FAT:
self.clusters[Cluster.ROOT_BLOCK_ID].allocate_cluster() self.clusters[Cluster.ROOT_BLOCK_ID].allocate_cluster()
def __init__(self, boot_sector_state: BootSectorState, init_: bool) -> None: def __init__(self, boot_sector_state: BootSectorState, init_: bool) -> None:
self._first_free_cluster_id = 0
self.boot_sector_state = boot_sector_state self.boot_sector_state = boot_sector_state
self.clusters: List[Cluster] = [Cluster(cluster_id=i, self.clusters: List[Cluster] = [Cluster(cluster_id=i,
boot_sector_state=self.boot_sector_state, boot_sector_state=self.boot_sector_state,
@@ -57,9 +58,11 @@ class FAT:
def find_free_cluster(self) -> Cluster: def find_free_cluster(self) -> Cluster:
# finds first empty cluster and allocates it # finds first empty cluster and allocates it
for cluster in self.clusters: for cluster_id, cluster in enumerate(self.clusters[self._first_free_cluster_id:],
start=self._first_free_cluster_id):
if cluster.is_empty: if cluster.is_empty:
cluster.allocate_cluster() cluster.allocate_cluster()
self._first_free_cluster_id = cluster_id
return cluster return cluster
raise NoFreeClusterException('No free cluster available!') raise NoFreeClusterException('No free cluster available!')