fbz

Faster, better zipper: an active compression-format research workbench with fast bzip2, gzip, LZ4, and ZIP decompression plus safe tar extraction.

fbz provides a native CLI, a Rust library, and a Python module. The CLI auto-selects bzip2, gzip, LZ4, or ZIP handling from the filename extension, falling back to stream magic when needed. It streams compressed tar variants through a bounded extractor and adaptively parallelises ZIP work within or across entries. Every path validates decoded sizes and checksums. The bzip2 implementation also provides persistent random-access indexes.

Compression is planned as a separate whole-surface design. The current implementation only decompresses: bzip2, gzip and LZ4 frames; their tar-wrapped variants; and stored or DEFLATE-compressed ZIP archives.

Install

PyPI wheels contain both the Python module and the native fbz executable—there is no Python CLI wrapper:

pip install fbz

Python 3.10 and later are supported. Prebuilt wheels target Linux on x86-64 and ARM64, and macOS on ARM64. macOS Intel is best-effort and can build from source.

Install the native CLI or add the Rust library from crates.io:

cargo install fbz
cargo add fbz

CLI

Decoding is the default operation. .bz2, .bzip2, .gz, .gzip, and .lz4 select their corresponding decoder and are removed from the output name. Compressed tar names—.tar.bz2, .tar.bzip2, .tbz, .tbz2, .tar.gz, .tar.gzip, .tgz, and .tar.lz4—and .zip automatically extract into the current directory or -C/--output-dir. -x/--extract forces archive extraction for stdin or an unusual filename; an explicit -o/--output instead writes a decoded tar stream, but is invalid for ZIP because ZIP has no single decoded byte stream. For stdin and unrecognised extensions, bzip2, gzip, LZ4, or ZIP magic selects the format. Other non-archive input names gain .out.

fbz dump.xml.bz2                   # write dump.xml
fbz events.json.gz                 # write events.json
fbz events.json.lz4                # write events.json
fbz source.tar.gz                  # extract into the current directory
fbz source.tar.lz4 -C unpacked     # stream-decode and extract
fbz source.tbz2 -C unpacked        # extract into unpacked/
fbz dataset.zip -C unpacked         # extract ZIP entries adaptively in parallel
fbz --extract -C unpacked -        # extract tar or ZIP data from stdin
fbz source.tgz -o source.tar       # decode without extracting
fbz dump.xml.bz2 -o result.xml     # choose the decoded output path
fbz dump.xml.bz2 -o -              # write decoded bytes to stdout

Multiple inputs are processed in order, with parallelism applied inside each compressed stream. -C/--output-dir collects decoded files and is the extraction root for archives:

fbz data/*.bz2 logs/*.gz -C decoded
fbz data/*.bz2 logs/*.gz -C decoded --skip-existing
fbz backups/*.tgz -C restored
fbz datasets/*.zip -C restored

Validation and inspection remain flags rather than subcommands:

fbz --test dump.xml.bz2          # fully decode and validate, writing nothing
fbz --index dump.xml.bz2         # write dump.xml.bz2.fbz2i (bzip2 only)
fbz --list events.json.gz        # print the validated member/block layout
fbz --list events.json.lz4       # print the validated frame/block layout
fbz --list dataset.zip           # print the validated entry layout
fbz --list --json dump.xml.bz2   # emit the complete layout as JSON

--test, --index, --list, and explicit --extract are mutually exclusive. Human-readable --list output labels each input when given multiple files; JSON output is one object for one input and an array for multiple inputs.

Output safety

Existing decoded files and archive entries are rejected by default. --force replaces them; --skip-existing applies to decoded files rather than archives.
Decoded-file outputs use a same-directory temporary file and become visible atomically only after successful checksum validation.
Tar entries stream into a same-filesystem staging directory through a bounded pipe. ZIP entries decode directly into the same staging scheme. Entries are preflighted and moved into the destination only after every relevant compression stream and archive structure validates, so a late CRC failure leaves no extracted files.
Tar and ZIP paths and link targets are confined to the destination. ZIP rejects unsafe or duplicate paths; tar safely skips unsafe entries. New entries use the archive's permissions and modification times where provided. Standalone decoded files inherit those values from the compressed input.
--rm removes each compressed input only after its decoded file or all archive entries have been committed successfully.
--max-output SIZE limits decoded bytes per input, including tar framing and padding. Sizes accept binary suffixes such as K, MiB, and G.

Long interactive operations report completion, decoded throughput, compression ratio, and ETA on stderr. Progress is disabled automatically when stderr is redirected; -q/--quiet also suppresses progress and skip notices.

-P/--threads 0, the default, uses the machine's available parallelism; an explicit positive value is honoured by every decoder. --memory-limit bounds speculative output in the shared scheduler and defaults to 1G. Gzip uses parallel dynamic-block discovery only when the input and memory budget can amortize it. LZ4 frames with independent blocks decode those blocks concurrently and commit them in order; automatic LZ4 decoding caps this memory-bandwidth-bound work at four workers, while explicit -P values remain unchanged. Linked-block frames decode serially because each block depends on the preceding 64 KiB history. ZIP uses one level of parallelism at a time: large entries use the parallel DEFLATE engine, while archives of ordinary entries decode files concurrently without nested worker pools.

Python

The Python API currently exposes the bzip2 backend. Unified Python dispatch will follow the CLI workbench rather than being designed ahead of it.

One-shot decompression and validation

import fbz

plain = fbz.decompress(compressed_bytes)
fbz.test("dump.xml.bz2")  # returns None after successful validation

decompress accepts a bytes-like object and returns bytes. test accepts either compressed bytes or a path and avoids retaining the decoded result.

Seekable reads and persistent indexes

fbz.open returns a seekable binary io.RawIOBase. Opening without an index performs a complete validation pass and builds an in-memory block index; build_index can persist that work for later processes:

import fbz

fbz.build_index("dump.xml.bz2", "dump.xml.bz2.fbz2i")

with fbz.open("dump.xml.bz2", index="dump.xml.bz2.fbz2i") as f:
    f.seek(1_000_000_000)
    chunk = f.read(64 * 1024)
    print(f.tell(), f.size)

Building an index fully decodes into a sink but does not write or retain the plaintext. Indexes contain compressed and decoded block offsets and are bound to the exact compressed source by its length and BLAKE3 hash. Loading one verifies that identity without decoding the whole payload; subsequent reads decode only the blocks needed for the requested range and cache recent blocks. cache_limit controls that cache. Path sources are memory-mapped, while bytes-like sources stay in memory.

Structural scanning

scan cheaply finds candidate stream headers and bit-level block markers without decoding:

import bz2
from fbz import scan

result = scan(bz2.compress(b"hello"))
assert result.blocks[0].bit_offset == 32

Scan results are deliberately untrusted candidates. Use test, decompress, build_index, or open when validation is required.

Rust

The streaming API accepts any Write destination and uses the serial fast path when threads is one:

use fbz::{DecodeOptions, Source, decompress_to_writer};

fn main() -> fbz::Result<()> {
    let source = Source::open("dump.xml.bz2")?;
    let mut output = std::io::stdout().lock();
    decompress_to_writer(source.as_slice(), &mut output, DecodeOptions::default())?;
    Ok(())
}

decompress returns a Vec<u8>. decode_to_writer returns a validated Index while streaming output, build_index validates into a sink, and their *_with_progress variants report completed compressed and decoded byte counts. IndexedReader implements Read and Seek; it can build an index itself or load a persisted one with open_with_index.

The in-repo gzip decoder is available separately so callers can choose explicitly:

let plain = fbz::gzip::decompress(&compressed_gzip)?;

gzip::decompress_to_writer and gzip::decompress_to_writer_with_options return a validated report containing gzip member metadata, each DEFLATE block's kind and ranges, and counts of accepted speculative and serial-fallback chunks. They support stored, fixed-Huffman, and dynamic-Huffman blocks, optional gzip headers, and concatenated members.

The raw shared codec is available as fbz::deflate::decompress_to_sink_with_options_and_progress; gzip framing and ZIP extraction both use this exact decoder.

The in-repo LZ4 frame decoder has the same one-shot, writer, options, progress, and report shapes as gzip:

let plain = fbz::lz4::decompress(&compressed_lz4)?;

It accepts standard independent or linked blocks, stored blocks, all four standard block maxima, optional block/content checksums and sizes, concatenated frames, and skippable frames. External dictionaries and the obsolete legacy frame format are intentionally unsupported.

Streaming reads

fbz::Reader provides a normal std::io::Read over bzip2 or gzip files without a preliminary indexing or validation pass:

use std::io::{BufReader, Read};
use fbz::{DecodeOptions, Reader};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let reader = Reader::open("dump.xml.bz2", DecodeOptions::default())?;
    let mut reader = BufReader::new(reader);
    let mut header = [0; 4096];
    reader.read_exact(&mut header)?;
    Ok(())
}

Magic takes priority over the filename extension, with the extension used as a fallback for damaged headers. The decoder runs on an owned worker thread and transfers completed decoder allocations through a zero-capacity pipe; it neither materializes the plaintext nor writes an intermediate file. DecodeOptions controls decoder threads and speculative memory. Dropping early disconnects the pipe, cancels outstanding work, and joins the worker.

Checksum errors discovered after output has begun are returned by a later read() call. Therefore only successful EOF establishes that the complete stream was valid; dropping early deliberately does not finish validation. Compressed tar inputs yield the decoded tar byte stream rather than extracting it. LZ4 and ZIP are not currently exposed through Reader: LZ4's frame-layout pass must first become incremental, while ZIP has no single decoded byte stream.

Performance

These are single local release-mode CLI runs on the primary Apple Silicon development machine. The gzip comparison warms each executable with the 5% fixture, then measures exactly one full validation run; peak physical footprint comes from a separate sampled run because process inspection can perturb such a short workload. ZIP and tar likewise warm each CLI once and then measure one extraction. The LZ4 comparison uses its automatic four-worker limit. These are observations rather than statistical aggregates. In-process codec and library-oracle comparisons live in DEV.md, not this user-facing section.

Full SimpleWiki recompressed with system gzip -6 (438,904,466 bytes compressed, 1,688,460,257 bytes decoded):

CLI	Mode	Seconds	Peak physical footprint
rapidgzip-rust, local checkout	auto parallel, `--test`	0.363	460.0 MiB
fbz	auto parallel, `--test`	0.326	335.9 MiB
Apple gzip	serial, stdout discarded	1.371	1.2 MiB

The memory values use macOS physical footprint rather than ru_maxrss. The fbz CLI memory-maps its 419 MiB input, so clean reclaimable file pages make RSS look roughly 419 MiB larger; pread-based tools leave the same cached pages outside process RSS. Physical footprint makes the comparison meaningful.

ZIPs containing the same 80.5 MiB SimpleWiki prefix (25.8 MiB compressed), after one untimed warm-up per executable:

Shape	fbz, auto parallel	Info-ZIP unzip 6.00 (Apple)	Speedup
One DEFLATE entry	35.571 ms	355.235 ms	10.0x
18 DEFLATE entries	29.700 ms	360.008 ms	12.1x

The many-entry sampled run used 36.7 MiB physical footprint for fbz versus 2.4 MiB for unzip; its 18-way file parallelism deliberately spends modest memory to obtain the throughput above. Both fbz rows used automatic thread selection, which resolved to 18 available cores on this machine.

Compressed tar archives containing the same 80.5 MiB prefix, after one untimed warm-up per CLI:

Format	fbz extraction	System `tar`	Speedup
`.tgz`	56.850 ms	117.962 ms	2.1x
`.tar.bz2`	151.783 ms	1.168 s	7.7x

The same 80.5 MiB prefix in a standard independent-block LZ4 frame (40.2 MiB compressed), after one untimed warm-up per executable:

CLI	Milliseconds	Peak RSS	fbz/reference
fbz, auto (4 workers)	51.188	71.0 MiB	0.944x
Homebrew `lz4` 1.10.0	54.228	32.0 MiB	—

The larger fbz RSS includes its memory-mapped 40.2 MiB source plus bounded in-flight decoded blocks; it does not grow with decoded file size. Testing higher worker counts showed no meaningful throughput gain and raised RSS, so automatic LZ4 decoding stops at four workers; -P remains an explicit override.

Homebrew pbzip2 1.1.13 could not safely decompress the complete 26,668,484,995-byte English Wikipedia multistream dump on this machine. It segfaulted, and repeated attempts produced divergent and truncated plaintext. Successful smaller-file results therefore do not establish full-file reliability.

Implementation and compatibility

The production codec logic is portable Rust. The bzip2 decoder uses a tuned 4096-entry Huffman lookup table for codes up to 12 bits and canonical fallback for longer codes. A structural scan finds possible non-byte-aligned block markers; these remain speculative until ordered decoding establishes the exact stream chain and validates all block and combined-stream CRCs. A rolling scheduler keeps workers busy across concatenated streams while bounding decoded results awaiting validation.

The gzip backend implements RFC 1952 framing and DEFLATE directly in this repository. For sufficiently large dynamic-Huffman inputs it discovers independently decodable boundaries, decodes speculative chunks through the shared byte-budgeted scheduler, and represents unknown predecessor bytes as compact markers. The ordered coordinator resolves only the suffix needed to derive the next 32 KiB history window; full marker resolution and per-chunk CRC run as priority work on the same staged worker queue, and CRCs are combined in order. Once a chunk has a marker-free window, the same decoder switches its remaining output from u16 markers to ordinary bytes. Small, stored-heavy, fixed-heavy, one-thread, and low-memory inputs use the serial path; concatenated members may independently choose either path. FHCRC, CRC32, and ISIZE are always validated. LZ4 framing and block decoding are likewise implemented in safe Rust. Independent blocks use the same ordered, byte-budgeted scheduler as bzip2; linked blocks retain only the preceding 64 KiB window. LZ4 and DEFLATE share one optimized overlapping back-reference expansion primitive. Header, block, and content XXH32 checksums are validated where present. ZIP reuses the raw DEFLATE core and uses the mature zip crate only for container structure and metadata. It supports stored and DEFLATE entries, Zip64, streaming data descriptors, Unix symlinks/modes, and Unix/NTFS modification-time fields; encryption and uncommon legacy compression methods are intentionally unsupported. crc32fast and twox-hash are the production checksum helpers; flate2 and lz4_flex are dev-only differential oracles.

Legacy randomized blocks generated by bzip2 releases before 0.9.5 are intentionally unsupported. Normal BZh1 through BZh9 streams and concatenated streams are supported.

Research lineage and credits

The gzip work builds on Maximilian Knespel and Holger Brunst's HPDC '23 paper, Rapidgzip: Parallel Decompression and Seeking in Gzip Files Using Cache Prefetching. In particular, fbz adapts its central idea of starting DEFLATE decoding without the preceding 32 KiB window, representing uncertain output until the true history becomes available, and committing independently decoded chunks in order.

The open-source implementations and codebases consulted were:

rapidgzip, the C++ implementation described by the paper.
rapidgzip-rust, a pure-Rust reimplementation and fbz's local gzip performance and memory reference.
librapidarchive, an experimental shared architecture for parallel bzip2 and gzip access.
indexed_bzip2, for non-byte-aligned marker scanning, independent bzip2 block decoding, ordered prefetch, and indexed seeking.
zip, used without codec features for maintained ZIP structure and metadata handling.
LZ4, the reference format and Homebrew CLI performance baseline.
lz4_flex, used dev-only to generate a broad interoperability matrix and benchmark frames.
lz4-rs, consulted as a second local implementation reference.
Rob Landley's 0BSD bzcat implementation in Toybox, from which fbz's specialised bzip2 decoder is derived.

Development

DEV.md documents the architecture, test strategy, benchmark fixture generation, build commands, and release process.

fbz is licensed under the Apache License 2.0.

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fbz 0.1.7

fbz

Install

CLI

Output safety

Python

One-shot decompression and validation

Seekable reads and persistent indexes

Structural scanning

Rust

Streaming reads

Performance

Implementation and compatibility

Research lineage and credits

Development

Project links

Key dates

1 maintainer

Credits

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