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reuse zeros also in fixed-size chunker for all-zero chunk detection

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also: zeros.startswith() is faster
This commit is contained in:
Thomas Waldmann 2021-01-08 20:03:34 +01:00
parent ef19d937ed
commit 4e3be1db5e
1 changed files with 2 additions and 2 deletions
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4
src/borg/chunker.pyx
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@ -178,7 +178,7 @@ class ChunkerFixed:
# should borg try to do sparse input processing?
# whether it actually can be done depends on the input file being seekable.
self.try_sparse = sparse and has_seek_hole
self.zeros = memoryview(bytes(block_size))
assert block_size <= len(zeros)
def chunkify(self, fd=None, fh=-1, fmap=None):
"""
@ -233,7 +233,7 @@ class ChunkerFixed:
# read block from the range
data = dread(offset, wanted, fd, fh)
got = len(data)
if data == self.zeros[:got]:
if zeros.startswith(data):
data = None
is_zero = True
else: