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SSR200: fix the problem #13

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SSR200: fix the problem #13

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13 changes: 7 additions & 6 deletions ssr200/convert_fat.py
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Original file line number Diff line number Diff line change
Expand Up @@ -178,12 +178,10 @@ def _overwrite_field(entry: bytes) -> bytearray:
print("Skip due to invalid cluster chain:", e)
continue

# Remove the odd numbers
filtered = cluster_chain[0:-1:2]

for c2 in filtered:
for c2 in cluster_chain[:-1]:
cluster_start = cluster_to_offset(bpb, c2)
cluster_end = cluster_to_offset(bpb, c2+1)

for off in range(cluster_start, cluster_end, 0x20):
ret[off + 0 : off + 0x20] = _overwrite_field(ret[off + 0 : off + 0x20])
return ret
Expand Down Expand Up @@ -249,7 +247,10 @@ def get_cluster_chain(fat: bytes, first_cluster: int) -> list:
cur_entry = first_cluster
while True:
if cur_entry == 0:
raise ValueError("The cluster chain contains a zero.")
raise ValueError("The cluster chain contains a free cluster (0x0000).")

if cur_entry == 0xFFF7:
raise ValueError("The cluster chain contains a bad cluster (0xFFF7).")

if cur_entry < 0xFFF8 and cur_entry*2 + 2 > len(fat):
raise ValueError("Cluster chain outside the FAT range.")
Expand Down Expand Up @@ -375,4 +376,4 @@ def main():
convert_fat_image(in_file, out_file, enable_normalize)

if __name__ == "__main__":
main()
main()
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