compress-utils
Unified Python interface for eight compression algorithms — Brotli, bzip2, LZ4, XZ/LZMA, zlib, Zstandard, Snappy, and gzip — backed by a single high-performance C library. Same API for every algorithm.
Installation
pip install compress-utils
The wheel is self-contained: no system codec libraries required at runtime. Type stubs (.pyi) and a py.typed marker ship with the wheel, so mypy, pyright, and IDE autocomplete work out of the box.
Quick start
Functional API (most common)
import compress_utils as cu
data = b"the quick brown fox jumps over the lazy dog" * 100
compressed = cu.compress(data, "zstd", level=5)
restored = cu.decompress(compressed, "zstd")
assert restored == data
Algorithm names accept both lowercase strings ("zstd", "brotli", …) and the typed enum:
cu.compress(data, cu.Algorithm.zstd, level=5)
Streaming API
For inputs that don't fit in memory or arrive incrementally:
from compress_utils import CompressStream, DecompressStream
cs = CompressStream("zstd", level=5)
chunks = [cs.compress(chunk) for chunk in iter_chunks(some_file)]
chunks.append(cs.finish())
compressed = b"".join(chunks)
ds = DecompressStream("zstd")
restored = ds.decompress(compressed) + ds.finish()
Supported algorithms
| Algorithm | Spelling | Notes |
|---|---|---|
| Zstandard | "zstd" |
Wire format: ZSTD frame with content size. |
| Brotli | "brotli" |
Wire format: raw Brotli stream. |
| zlib | "zlib" |
Wire format: zlib wrapper (RFC 1950). |
| bzip2 | "bz2" (also "bzip2") |
bzip2 stream. |
| LZ4 | "lz4" |
LZ4 frame format (compatible with lz4 CLI / .lz4 files). |
| XZ/LZMA | "xz" (also "lzma") |
XZ stream with CRC64. |
| Snappy | "snappy" |
Raw Snappy block format. |
| gzip | "gzip" |
gzip stream (RFC 1952; .gz files, gzip CLI). |
| DEFLATE | "deflate" |
Raw DEFLATE (RFC 1951), no wrapper. |
| LZ4 block | "lz4_raw" |
Raw LZ4 block, no frame or size prefix. One-shot only; decompress needs expected_size. |
| LZO1X | "lzo" |
Raw LZO1X block. Decompression only. |
cu.is_available(name_or_enum) returns True for algorithms compiled into the installed wheel.
Raw blocks and expected_size
Raw block formats such as those inside Parquet and ORC pages don't record their decompressed size. Pass expected_size, an upper bound on the output; the result holds only the bytes actually decoded:
page = cu.decompress(block, "lz4_raw", expected_size=uncompressed_page_size)
expected_size is required for lz4_raw, which has no streaming decoder. Every other algorithm accepts it too, which skips the size probe and decodes straight into a buffer of that size.
Other helpful APIs
cu.version() # "0.1.0"
cu.set_max_decompressed_size(256 * 1024**2) # bound one-shot decompression
# (default: 1 GiB; 0 = unbounded)
try:
cu.decompress(garbage, "zstd")
except cu.CompressError as e:
print(e)
Compression levels
Every algorithm accepts a level from 1 (fastest) to 10 (smallest). The Python binding maps this to each algorithm's native range automatically — you don't need to know that ZSTD goes 1–22 or zlib goes 1–9. Defaults to 5 if omitted.
Type checking
The package ships PEP 561 type information:
import compress_utils as cu
reveal_type(cu.compress) # → (data: Buffer, algorithm: object, level: int = 5) -> bytes
reveal_type(cu.Algorithm.zstd) # → Algorithm
Stubs are regenerated from the compiled module at build time (via pybind11-stubgen), so they cannot drift from the binding signatures.
Performance notes
The Python binding is a thin pybind11 wrapper over the C library. Streaming uses chunked buffers with an internal drain protocol — output is yielded in 64 KB pages, so streaming a multi-GB file does not hold the whole compressed result in memory.
For applications that round-trip many small payloads with the same algorithm, prefer the functional API over creating a new CompressStream per payload — internal codec state is short-lived and reused.
Project layout
This is one of four official bindings to the compress-utils C library:
- C — the canonical ABI in
include/compress_utils.h. - C++ — header-only
cu::namespace,bindings/cpp/. - Python — this package.
- JS / TS (WASM) —
npm install compress-utils,bindings/wasm/.
Go, Rust, Swift, and Java bindings are tracked in TODO.md.
License
MIT. See LICENSE.
Built by Nico Dupont.
1 maintainer
Metadata
1 maintainer
Release files for compress-utils 0.9.0
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