[alan-divd]

Summary

Adds CRC-64/NVME, the 64 bit counterpart to the existing crc32c, in both a
pure Python and a native Rust implementation.

The layout follows crc32c exactly, so dissect.util.hash.crc64c resolves to
the native version when the extension is available and falls back to Python
otherwise, with crc64c_native and crc64c_python available for picking one
explicitly.

Parameters are polynomial 0xAD93D23594C93659, reflected, with all-ones init
and xorout.

Test plan

• tox run -e py3 passes (163 passed, 63 skipped)
• Matches the official CRC-64/NVME check value,
  crc64c(b"123456789") == 0xae8b14860a799888
• Cross-checked against an independent from-spec bitwise reference
  implementation rather than only against itself
• Native and Python agree over 300 randomized inputs, including chunked
  updates composed via the value argument
• The shared crc64c fixture runs every case against both
  implementations, matching how crc32c is tested
• Closes Add crc64c support #134

[codecov]

Codecov Report

❌ Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (f4ff370) to head (53a45a0).

Files with missing lines	Patch %	Lines
dissect/util/hash/crc64c.py	0.00%	10 Missing ⚠️
dissect/util/hash/__init__.py	0.00%	4 Missing ⚠️
dissect/util/__init__.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #138   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files         30      31    +1     
  Lines       2157    2170   +13     
=====================================
- Misses      2157    2170   +13     

Flag	Coverage Δ
unittests	0.00% <0.00%> (ø)

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[codspeed]

Merging this PR will improve performance by 21.32%

1 warning

⚠️ Base and head ran on different runner types

Some benchmarks with significant performance changes were compared across different runner types, so the changes might not come from the code. Run base and head on the same runner type, or use CodSpeed Macro Runners for more stable results.

Learn more about Macro Runners

Open the report in CodSpeed to investigate

⚡ 2 improved benchmarks
✅ 36 untouched benchmarks
🆕 1 new benchmark

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
⚡	test_benchmark_lz4_decompress_dictionary[python-large]	344.8 µs	258.5 µs	+33.38%
⚡	test_benchmark_lz4_decompress[python-large]	126.9 µs	115 µs	+10.36%
🆕	test_crc64c_benchmark[python]	N/A	28.6 µs	N/A

Tip

Curious why performance improved? Comment @codspeedbot explain why performance improved on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing alan-divd:feat/crc64c (53a45a0) with main (f4ff370)}