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Merge pull request #5076 from elho/auto-compressor-correct-ratio-calculation

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correctly calculate compression ratio, taking header size into accoun…
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TW 2020-04-04 14:02:44 +02:00 committed by GitHub
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src/borg/compress.pyx
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@ -311,7 +311,8 @@ class Auto(CompressorBase):
*lz4_data* is the LZ4 result if *compressor* is LZ4 as well, otherwise it is None.
"""
lz4_data = LZ4_COMPRESSOR.compress(data)
ratio = len(lz4_data) / len(data)
# lz4_data includes the compression type header, while data does not yet
ratio = len(lz4_data) / (len(data) + 2)
if ratio < 0.97:
return self.compressor, lz4_data
elif ratio < 1: