osobhandClaude Opus 5.5
735db117a7
The core crates (clawhdf5, -agent, -format, -io, -filters, -ann, -accel, -netcdf4, -cli) now build no C by default: deflate defaults to zlib-rs, a pure-Rust port of zlib-ng, and zlib-ng becomes the opt-in `fast-deflate`, which overrides zlib-rs wherever it is enabled. A default build no longer needs cmake or a C compiler. Measured on tank, both builds run alternately, three rounds, medians: zlib-rs is within 6% of zlib-ng on every HDF5 read and write (512x512 deflate-6 chunked write 1.458 vs 1.484 ms; 64 MB compressed read 64.4 vs 65.2 ms), and compressed output is byte-identical. Details in BENCHMARKS.md, "Deflate backend". Getting there took two fixes the first measurement exposed: - zlib-rs needs `std` to detect SIMD at runtime. flate2 enables it via its default `runtime_detection`, which `default-features = false` had switched off, leaving zlib-rs 3.5x slower on inflate. The `zlib-rs` features now enable it. - Both deflate paths streamed through flate2's 32 KiB read/write wrappers. They now hand the codec the whole chunk in one call, into a buffer sized up front (~5% on chunked writes). This also fixes a silent short read: the streaming reader returned a truncated stream's bytes without an error; a truncated chunk is now DecompressionError. In clawhdf5-filters, output longer than the stated size is now an error rather than silently cut off. CI: ci-test.sh lints and tests the zlib-ng path, and fails if a C-building crate (*-sys, cc, cmake) enters a core crate's default dependency tree. The arm64 job no longer installs cmake. Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
37 lines
1.1 KiB
TOML
37 lines
1.1 KiB
TOML
[package]
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name = "clawhdf5-filters"
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version = "2.7.0"
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edition = "2024"
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description = "Filter and compression pipeline for clawhdf5"
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license = "MIT"
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repository = "https://git.redclaw.dev/quantumclaw/clawhdf5"
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readme = "README.md"
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keywords = ["hdf5", "compression", "deflate", "filters"]
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categories = ["compression", "science"]
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[dependencies]
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flate2 = { version = "1", default-features = false, features = ["rust_backend"] }
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miniz_oxide = "0.8"
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[dev-dependencies]
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criterion = { workspace = true }
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[[bench]]
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name = "deflate_bench"
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harness = false
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[[bench]]
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name = "compression_bench"
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harness = false
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[features]
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# Pure-Rust zlib-rs by default; `fast-deflate` (zlib-ng, C) overrides it.
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default = ["zlib-rs"]
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fast-deflate = ["flate2/zlib-ng"]
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system-zlib = ["flate2/zlib-default"]
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# `runtime_detection` gives zlib-rs `std`, which it needs to detect and use
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# SIMD at runtime. flate2 enables it by default, but we build flate2 with
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# default-features = false, and without it zlib-rs inflates 3.5x slower.
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zlib-rs = ["flate2/zlib-rs", "flate2/runtime_detection"]
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apple-compression = []
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