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immutable: ValidatedExtendedURIProxy computes and stores the tail data size as a convenience to its caller.

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The "tail data size" is how many of the bytes of the tail segment are data (as opposed to padding).
This commit is contained in:
Zooko O'Whielacronx 2009-01-08 10:41:39 -07:00
parent 2e762f39f6
commit 7d15928faa
1 changed files with 5 additions and 4 deletions
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9
src/allmydata/immutable/download.py
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@ -204,6 +204,7 @@ class ValidatedExtendedURIProxy:
self.block_size = None
self.share_size = None
self.num_segments = None
self.tail_data_size = None
self.tail_segment_size = None
# optional
@ -246,11 +247,11 @@ class ValidatedExtendedURIProxy:
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
if not tail_data_size:
tail_data_size = self.segment_size
self.tail_data_size = self._verifycap.size % self.segment_size
if not self.tail_data_size:
self.tail_data_size = self.segment_size
# padding for erasure code
self.tail_segment_size = mathutil.next_multiple(tail_data_size, self._verifycap.needed_shares)
self.tail_segment_size = mathutil.next_multiple(self.tail_data_size, self._verifycap.needed_shares)
# Ciphertext hash tree root is mandatory, so that there is at most one ciphertext that
# matches this read-cap or verify-cap. The integrity check on the shares is not