tests/qemu-iotests/fat16.py

105     def first_sector_of_cluster(self, cluster: int) -> int:
110             self.data_sector_start() + (cluster - 2) * self.sectors_per_cluster
154         self.cluster = (high_cluster << 16) | low_cluster
171             + (self.cluster >> 16).to_bytes(2, "little")
174             + (self.cluster & 0xFFFF).to_bytes(2, "little")
279     def read_fat_entry(self, cluster: int) -> int:
283         fat_offset = cluster * 2  # FAT16
286     def write_fat_entry(self, cluster: int, value: int) -> None:
290         fat_offset = cluster * 2
308     def next_cluster(self, cluster: int) -> Optional[int]:
315         fat_entry = self.read_fat_entry(cluster)
355     def read_cluster(self, cluster: int) -> bytes:
360             self.boot_sector.first_sector_of_cluster(cluster),
364     def write_cluster(self, cluster: int, data: bytes) -> None:
370             self.boot_sector.first_sector_of_cluster(cluster),
375         self, cluster: Optional[int]
381         while cluster is not None:
382             data = self.read_cluster(cluster)
385                     data, self.boot_sector.first_sector_of_cluster(cluster)
388             cluster = self.next_cluster(cluster)
392         self, cluster: Optional[int], name: str, ext: str, attributes: int
422         new_entry.cluster = self.next_free_cluster()
426         self.write_fat_entry(new_entry.cluster, 0xFFFF)
428         if cluster is None:
440             while cluster is not None:
441                 data = self.read_cluster(cluster)
445                         self.boot_sector.first_sector_of_cluster(cluster)
450                 cluster = self.next_cluster(cluster)
496             directory = self.read_directory(current_entry.cluster)
510         cluster: Optional[int] = entry.cluster
511         while cluster is not None and len(data) <= entry.size_bytes:
512             data += self.read_cluster(cluster)
513             cluster = self.next_cluster(cluster)
547         cluster: Optional[int]
551             cluster = entry.cluster
555                 assert cluster is not None, "Cluster is None"
556                 affected_clusters.add(cluster)
557                 cluster = self.next_cluster(cluster)
559             assert cluster is not None, "Cluster is None"
561                 self.next_cluster(cluster) is None
570                 self.write_fat_entry(cluster, new_cluster)
572                 cluster = new_cluster
576             cluster = entry.cluster
578                 assert cluster is not None, "Cluster is None"
579                 cluster = self.next_cluster(cluster)
580             assert cluster is not None, "Cluster is None"
582             next_cluster = self.next_cluster(cluster)
584             self.write_fat_entry(cluster, 0xFFFF)
587                 cluster = next_cluster
589                 self.write_fat_entry(cluster, 0)
594         cluster = entry.cluster
596         while cluster is not None:
598             affected_clusters.add(cluster)
599             cluster = self.next_cluster(cluster)
609         for cluster in affected_clusters:
610             first_sector = self.boot_sector.first_sector_of_cluster(cluster)
627         cluster: Optional[int] = entry.cluster
628         while cluster is not None:
631                 old_data = self.read_cluster(cluster)
634             self.write_cluster(cluster, data_to_write)
638             cluster = self.next_cluster(cluster)
673             directory = self.read_directory(current_entry.cluster)
674             directory_cluster = current_entry.cluster