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immutable: ValidatedExtendedURIProxy computes and stores block_size and share_size for the convenience of its users

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This commit is contained in:
Zooko O'Whielacronx 2009-01-02 11:43:17 -07:00
parent f1feb08f6a
commit 0ee027c180
1 changed files with 5 additions and 0 deletions
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src/allmydata/immutable/download.py
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@ -189,6 +189,8 @@ class ValidatedExtendedURIProxy:
self.share_root_hash = None
# computed
self.block_size = None
self.share_size = None
self.num_segments = None
self.tail_segment_size = None
@ -210,6 +212,8 @@ class ValidatedExtendedURIProxy:
return data
def _parse_and_validate(self, data):
self.share_size = mathutil.div_ceil(self._verifycap.size, self._verifycap.needed_shares)
d = uri.unpack_extension(data)
# There are several kinds of things that can be found in a UEB. First, things that we
@ -227,6 +231,7 @@ class ValidatedExtendedURIProxy:
# crypttext_root_hash, and share_root_hash.
self.segment_size = d['segment_size']
self.block_size = mathutil.div_ceil(self.segment_size, self._verifycap.needed_shares)
self.num_segments = mathutil.div_ceil(self._verifycap.size, self.segment_size)
tail_data_size = self._verifycap.size % self.segment_size