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mutable/retrieve.py: use floor division to calculate segment boundaries, don't fetch more segments than necessary

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This commit is contained in:
Kevan Carstensen 2011-08-13 11:38:33 -07:00
parent a1a334e1a0
commit 3423b7d6f7
1 changed files with 6 additions and 8 deletions
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14
src/allmydata/mutable/retrieve.py
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@ -385,11 +385,7 @@ class Retrieve:
self.log("got offset: %d" % self._offset)
# our start segment is the first segment containing the
# offset we were given.
start = mathutil.div_ceil(self._offset,
self._segment_size)
# this gets us the first segment after self._offset. Then
# our start segment is the one before it.
start -= 1
start = self._offset // self._segment_size
assert start < self._num_segments
self._start_segment = start
@ -403,9 +399,11 @@ class Retrieve:
# segment that we were asked to read.
self.log("got read length %d" % self._read_length)
end_data = self._offset + self._read_length
end = mathutil.div_ceil(end_data,
self._segment_size)
end -= 1
# We don't actually need to read the byte at end_data, but
# the one before it.
end_data = end_data - 1
end = end_data // self._segment_size
assert end < self._num_segments
self._last_segment = end
self.log("got end segment: %d" % self._last_segment)