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ChunkerParams: add support for buzhash64

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Thomas Waldmann 2025-06-05 22:25:22 +02:00
parent dc2dab1535
commit 6f55cba0ce
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1 changed files with 15 additions and 0 deletions
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15
src/borg/helpers/parseformat.py
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@ -187,6 +187,21 @@ def ChunkerParams(s):
return algo, block_size, header_size
if algo == "default" and count == 1: # default
return CHUNKER_PARAMS
if algo == CH_BUZHASH64 and count == 5: # buzhash64, chunk_min, chunk_max, chunk_mask, window_size
chunk_min, chunk_max, chunk_mask, window_size = (int(p) for p in params[1:])
if not (chunk_min <= chunk_mask <= chunk_max):
raise argparse.ArgumentTypeError("required: chunk_min <= chunk_mask <= chunk_max")
if chunk_min < 6:
# see comment in 'fixed' algo check
raise argparse.ArgumentTypeError(
"min. chunk size exponent must not be less than 6 (2^6 = 64B min. chunk size)"
)
if chunk_max > 23:
raise argparse.ArgumentTypeError(
"max. chunk size exponent must not be more than 23 (2^23 = 8MiB max. chunk size)"
)
# note that for buzhash64, there is no problem with even window_size.
return CH_BUZHASH64, chunk_min, chunk_max, chunk_mask, window_size
# this must stay last as it deals with old-style compat mode (no algorithm, 4 params, buzhash):
if algo == CH_BUZHASH and count == 5 or count == 4: # [buzhash, ]chunk_min, chunk_max, chunk_mask, window_size
chunk_min, chunk_max, chunk_mask, window_size = (int(p) for p in params[count - 4 :])