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immutable: raise a LayoutInvalid exception instead of an AssertionError if the share is corrupted so that the sharehashtree is the wrong size

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Zooko O'Whielacronx 2009-01-05 14:01:14 -07:00
parent 98b28c1d5e
commit f4fab23bf6
1 changed files with 2 additions and 1 deletions
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src/allmydata/immutable/layout.py
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@ -414,7 +414,8 @@ class ReadBucketProxy:
end of the share, so we need to use the offset and read just that much.""" end of the share, so we need to use the offset and read just that much."""
offset = self._offsets['share_hashes'] offset = self._offsets['share_hashes']
size = self._offsets['uri_extension'] - offset size = self._offsets['uri_extension'] - offset
assert size % (2+HASH_SIZE) == 0 if size % (2+HASH_SIZE) != 0:
raise LayoutInvalid("share hash tree corrupted -- should occupy a multiple of %d bytes, not %d bytes" % ((2+HASH_SIZE), size))
d = self._read(offset, size) d = self._read(offset, size)
def _unpack_share_hashes(data): def _unpack_share_hashes(data):
assert len(data) == size assert len(data) == size