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mutable: cheap padding hack to make zfec tolerate short files

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This commit is contained in:
Brian Warner 2007-11-08 04:30:37 -07:00
parent bf84b191c5
commit 61d9ab7690
1 changed files with 9 additions and 3 deletions
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12
src/allmydata/mutable.py
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@ -891,10 +891,16 @@ class Publish:
# now apply FEC
self.MAX_SEGMENT_SIZE = 1024*1024
data_length = len(crypttext)
if len(crypttext) < 10:
# TODO: FEC doesn't handle short (or empty) strings very well, so
# give it something longer and we'll trim the results later. For
# some reason I suspect the lower limit is k**2
crypttext = crypttext + "\x00"*(10-len(crypttext))
segment_size = min(self.MAX_SEGMENT_SIZE, len(crypttext))
# this must be a multiple of self.required_shares
segment_size = mathutil.next_multiple(segment_size,
required_shares)
segment_size = mathutil.next_multiple(segment_size, required_shares)
self.num_segments = mathutil.div_ceil(len(crypttext), segment_size)
assert self.num_segments == 1 # SDMF restrictions
fec = codec.CRSEncoder()
@ -913,7 +919,7 @@ class Publish:
d.addCallback(lambda shares_and_shareids:
(shares_and_shareids,
required_shares, total_shares,
segment_size, len(crypttext),
segment_size, data_length,
target_info) )
return d