Crous

A compact, canonical binary serializer and human-readable alternative to JSON, written in Rust.

CI License

Overview

Crous is a production-grade binary serialization format that provides:

  • Compact binary encoding — 2×–5× smaller than equivalent JSON
  • Human-readable text notation — unique syntax with deterministic binary mapping
  • Zero-copy decoding — borrow directly from input buffers
  • Schema evolution — stable field IDs, unknown-field skipping
  • Streaming support — block-framed format with per-block checksums
  • Pluggable compression — zstd/snappy per-block, with plugin trait
  • Cross-language FFI — clean C bindings with documented ownership

Quick Start

use crous_core::{Encoder, Decoder, Value};

// Encode
let value = Value::Object(vec![
    ("name".into(), Value::Str("Alice".into())),
    ("age".into(), Value::UInt(30)),
    ("active".into(), Value::Bool(true)),
]);

let mut encoder = Encoder::new();
encoder.encode_value(&value).unwrap();
let bytes = encoder.finish().unwrap();

// Decode (zero-copy)
let mut decoder = Decoder::new(&bytes);
let decoded = decoder.decode_next().unwrap();
assert_eq!(decoded.to_owned_value(), value);

Human-Readable Syntax

{
    name: "Alice";
    age: 30;
    tags: ["admin", "user"];
    config: {
        theme: "dark";
        notifications: true;
    };
    avatar: b64#iVBORw0KGgo=;
}

Workspace Crates

Crate Description
crous-core Encoder/decoder, block framing, Value types
crous-derive #[derive(Crous)] proc-macro with stable field IDs
crous-io Async Tokio adapters, framed streams
crous-cli CLI: inspect, pretty-print, convert
crous-compression Pluggable zstd/snappy compression
crous-ffi C FFI bindings
crous-simd NEON/SSE2 SIMD acceleration (byte scanning)

Python Implementation

A pure-Python implementation is included in python/crous/, providing full encode/decode compatibility with the Rust implementation:

import crous

# Encode
data = crous.encode({"name": "Alice", "age": 30, "active": True})

# Decode
obj = crous.decode(data)
print(obj)  # {'name': 'Alice', 'age': 30, 'active': True}

# Human-readable text format
text = crous.pretty_print(crous.Value.from_python(obj))
print(text)

Cross-language interop verified: Rust-encoded files decode correctly in Python and vice versa.

# Run Python tests
cd python && python -m pytest tests/ -v

CLI Usage

# Install
cargo install --path crous-cli

# Convert JSON to Crous
crous from-json data.json -o data.crous

# Pretty-print a Crous file
crous pretty data.crous

# Inspect block layout
crous inspect data.crous

# Convert back to JSON
crous to-json data.crous

# Quick benchmark
crous bench data.json -n 10000

Derive Macro

use crous_derive::{Crous, CrousSchema};

#[derive(Debug, PartialEq, Crous, CrousSchema)]
struct Person {
    #[crous(id = 1)] name: String,
    #[crous(id = 2)] age: u8,
    #[crous(id = 3)] tags: Vec<String>,
}

let alice = Person {
    name: "Alice".into(),
    age: 30,
    tags: vec!["admin".into()],
};

// Encode
let value = alice.to_crous_value();
let mut encoder = Encoder::new();
encoder.encode_value(&value).unwrap();
let bytes = encoder.finish().unwrap();

Binary Format Summary

File:    [Header 8B] [Block]* [Trailer Block]
Header:  "CROUSv1" (7B) | flags (1B)
Block:   type(1B) | length(varint) | compression(1B) | checksum(8B) | payload

Wire types: Null, Bool, VarUInt (LEB128), VarInt (ZigZag+LEB128), Fixed64, LenDelimited, StartObject, EndObject, StartArray, EndArray, Reference.

Build & Test

cargo build --workspace
cargo test --workspace --all-features
cargo clippy --workspace --all-features
cargo bench -p crous-core

Fuzzing

cargo +nightly fuzz run fuzz_decode     # arbitrary byte decoder
cargo +nightly fuzz run fuzz_roundtrip  # structured Value roundtrip
cargo +nightly fuzz run fuzz_text       # text parser
cargo +nightly fuzz run fuzz_varint     # varint codec

Performance

Crous vs JSON (serde_json) on Apple Silicon (M-series):

Payload Crous size JSON size Ratio Decode speed
Small object 118 B 90 B 1.31× 4× faster
100 users nested 9.8 KB 10.3 KB 0.95× ~2× faster
10K integers 29.9 KB 52.8 KB 0.57× ~3× faster
64 KB binary 65.6 KB 87.4 KB 0.75× ~10× faster

Crous decode throughput: 1.2 GiB/s for small objects.

License

Licensed under either of:

at your option.

Project links

Key dates

PyPI data
Data sourced directly from PyPI's database.
  • Released:
Latest release

1 maintainer

PyPI data
Data sourced directly from PyPI's database.
Avatar for axiomchronicles from gravatar.com axiomchronicles

Credits

Author: Pawan Kumar

License

Apache Software License, MIT License

Requires

Python >=3.9

Tags

serialization binary encoder decoder crous

Classifiers

Report project as malware

Release files for crous-native 1.1.2

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for crous-native 1.1.2
File Size Uploaded
crous_native-1.1.2.tar.gz 80.2 kB Details

Built distributions (wheels)

Table of built distributions (wheels) for crous-native 1.1.2
File
crous_native-1.1.2-pp311-pypy311_pp73-musllinux_1_2_x86_64.whl 590.9 kB PyPy 3.11 PyPy 3.11 7.3 Linux musl 1.2+ x86-64 Details
crous_native-1.1.2-pp311-pypy311_pp73-musllinux_1_2_aarch64.whl 553.2 kB PyPy 3.11 PyPy 3.11 7.3 Linux musl 1.2+ ARM64 Details
crous_native-1.1.2-pp311-pypy311_pp73-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 386.8 kB PyPy 3.11 PyPy 3.11 7.3 Linux glibc 2.17+ x86-64 Details
crous_native-1.1.2-pp311-pypy311_pp73-manylinux_2_17_aarch64.manylinux2014_aarch64.whl 376.4 kB PyPy 3.11 PyPy 3.11 7.3 Linux glibc 2.17+ ARM64 Details
crous_native-1.1.2-cp314-cp314t-musllinux_1_2_x86_64.whl 585.4 kB CPython 3.14 CPython 3.14 free-threading Linux musl 1.2+ x86-64 Details
crous_native-1.1.2-cp314-cp314t-musllinux_1_2_aarch64.whl 546.9 kB CPython 3.14 CPython 3.14 free-threading Linux musl 1.2+ ARM64 Details
crous_native-1.1.2-cp314-cp314-win_amd64.whl 233.4 kB CPython 3.14 CPython 3.14 Windows x86-64 Details
crous_native-1.1.2-cp314-cp314-musllinux_1_2_x86_64.whl 584.8 kB CPython 3.14 CPython 3.14 Linux musl 1.2+ x86-64 Details
crous_native-1.1.2-cp314-cp314-musllinux_1_2_aarch64.whl 548.5 kB CPython 3.14 CPython 3.14 Linux musl 1.2+ ARM64 Details
crous_native-1.1.2-cp314-cp314-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 382.1 kB CPython 3.14 CPython 3.14 Linux glibc 2.17+ x86-64 Details
crous_native-1.1.2-cp314-cp314-manylinux_2_17_aarch64.manylinux2014_aarch64.whl 372.8 kB CPython 3.14 CPython 3.14 Linux glibc 2.17+ ARM64 Details
crous_native-1.1.2-cp314-cp314-macosx_11_0_arm64.whl 340.3 kB CPython 3.14 CPython 3.14 macOS 11.0+ ARM64 Details
crous_native-1.1.2-cp314-cp314-macosx_10_12_x86_64.whl 349.3 kB CPython 3.14 CPython 3.14 macOS 10.12+ x86-64 Details
crous_native-1.1.2-cp313-cp313t-musllinux_1_2_x86_64.whl 585.4 kB CPython 3.13 CPython 3.13 free-threading Linux musl 1.2+ x86-64 Details
crous_native-1.1.2-cp313-cp313t-musllinux_1_2_aarch64.whl 546.8 kB CPython 3.13 CPython 3.13 free-threading Linux musl 1.2+ ARM64 Details
crous_native-1.1.2-cp313-cp313-win_amd64.whl 233.2 kB CPython 3.13 CPython 3.13 Windows x86-64 Details
crous_native-1.1.2-cp313-cp313-musllinux_1_2_x86_64.whl 585.0 kB CPython 3.13 CPython 3.13 Linux musl 1.2+ x86-64 Details
crous_native-1.1.2-cp313-cp313-musllinux_1_2_aarch64.whl 547.1 kB CPython 3.13 CPython 3.13 Linux musl 1.2+ ARM64 Details
crous_native-1.1.2-cp313-cp313-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 382.0 kB CPython 3.13 CPython 3.13 Linux glibc 2.17+ x86-64 Details
crous_native-1.1.2-cp313-cp313-manylinux_2_17_aarch64.manylinux2014_aarch64.whl 371.7 kB CPython 3.13 CPython 3.13 Linux glibc 2.17+ ARM64 Details
crous_native-1.1.2-cp313-cp313-macosx_11_0_arm64.whl 340.3 kB CPython 3.13 CPython 3.13 macOS 11.0+ ARM64 Details
crous_native-1.1.2-cp313-cp313-macosx_10_12_x86_64.whl 348.8 kB CPython 3.13 CPython 3.13 macOS 10.12+ x86-64 Details
crous_native-1.1.2-cp312-cp312-win_amd64.whl 233.4 kB CPython 3.12 CPython 3.12 Windows x86-64 Details
crous_native-1.1.2-cp312-cp312-musllinux_1_2_x86_64.whl 584.5 kB CPython 3.12 CPython 3.12 Linux musl 1.2+ x86-64 Details
crous_native-1.1.2-cp312-cp312-musllinux_1_2_aarch64.whl 548.0 kB CPython 3.12 CPython 3.12 Linux musl 1.2+ ARM64 Details
crous_native-1.1.2-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 381.8 kB CPython 3.12 CPython 3.12 Linux glibc 2.17+ x86-64 Details
crous_native-1.1.2-cp312-cp312-manylinux_2_17_aarch64.manylinux2014_aarch64.whl 372.3 kB CPython 3.12 CPython 3.12 Linux glibc 2.17+ ARM64 Details
crous_native-1.1.2-cp312-cp312-macosx_11_0_arm64.whl 340.6 kB CPython 3.12 CPython 3.12 macOS 11.0+ ARM64 Details
crous_native-1.1.2-cp312-cp312-macosx_10_12_x86_64.whl 349.0 kB CPython 3.12 CPython 3.12 macOS 10.12+ x86-64 Details
crous_native-1.1.2-cp311-cp311-win_amd64.whl 235.2 kB CPython 3.11 CPython 3.11 Windows x86-64 Details
crous_native-1.1.2-cp311-cp311-musllinux_1_2_x86_64.whl 588.5 kB CPython 3.11 CPython 3.11 Linux musl 1.2+ x86-64 Details
crous_native-1.1.2-cp311-cp311-musllinux_1_2_aarch64.whl 550.6 kB CPython 3.11 CPython 3.11 Linux musl 1.2+ ARM64 Details
crous_native-1.1.2-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 385.0 kB CPython 3.11 CPython 3.11 Linux glibc 2.17+ x86-64 Details
crous_native-1.1.2-cp311-cp311-manylinux_2_17_aarch64.manylinux2014_aarch64.whl 374.3 kB CPython 3.11 CPython 3.11 Linux glibc 2.17+ ARM64 Details
crous_native-1.1.2-cp311-cp311-macosx_11_0_arm64.whl 342.7 kB CPython 3.11 CPython 3.11 macOS 11.0+ ARM64 Details
crous_native-1.1.2-cp311-cp311-macosx_10_12_x86_64.whl 351.4 kB CPython 3.11 CPython 3.11 macOS 10.12+ x86-64 Details
crous_native-1.1.2-cp310-cp310-win_amd64.whl 235.0 kB CPython 3.10 CPython 3.10 Windows x86-64 Details
crous_native-1.1.2-cp310-cp310-musllinux_1_2_x86_64.whl 588.7 kB CPython 3.10 CPython 3.10 Linux musl 1.2+ x86-64 Details
crous_native-1.1.2-cp310-cp310-musllinux_1_2_aarch64.whl 550.7 kB CPython 3.10 CPython 3.10 Linux musl 1.2+ ARM64 Details
crous_native-1.1.2-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 385.0 kB CPython 3.10 CPython 3.10 Linux glibc 2.17+ x86-64 Details
crous_native-1.1.2-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl 374.4 kB CPython 3.10 CPython 3.10 Linux glibc 2.17+ ARM64 Details
crous_native-1.1.2-cp39-cp39-musllinux_1_2_x86_64.whl 591.1 kB CPython 3.9 CPython 3.9 Linux musl 1.2+ x86-64 Details
crous_native-1.1.2-cp39-cp39-musllinux_1_2_aarch64.whl 553.2 kB CPython 3.9 CPython 3.9 Linux musl 1.2+ ARM64 Details
crous_native-1.1.2-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 387.3 kB CPython 3.9 CPython 3.9 Linux glibc 2.17+ x86-64 Details
crous_native-1.1.2-cp39-cp39-manylinux_2_17_aarch64.manylinux2014_aarch64.whl 376.8 kB CPython 3.9 CPython 3.9 Linux glibc 2.17+ ARM64 Details

Total release size: 19.6 MB

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1.1.0

1 release file

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