Cijak
A high density Unicode-based encoding library that packs binary data into CJK characters. Cijak encodes up to 14 bits per character, making it significantly more character-efficient than Base64 while maintaining competitive performance through optimized C extensions.
The name "Cijak" comes from the CJK Unicode block, where you can encode 14 bits of data (C1J4K).
Why Cijak?
Cijak is designed for scenarios where:
- Character count matters more than byte size (SMS, tweets, chat apps)
- You need Unicode-safe encoding that doesn't look like obvious Base64
Performance Comparison
Benchmarked on 3.7 KB of binary data:
| Metric | Base64 | Cijak | Cijak (Python Fallback) |
|---|---|---|---|
| Encode | 3.78 μs | 4.21 μs | 1340 μs |
| Decode | 8.19 μs | 5.24 μs | 1338 μs |
| Character count | 4,944 | 2,120 | --- |
| Character compression | -33% | 43% | --- |
| UTF-8 size | 4,944 B | 6,360 B | --- |
| UTF-16 size | 9,890 B | 4,242 B | --- |
TL;DR: Cijak uses 57% fewer characters than the original, while Base64 increases character count by 33%. Encoding speed matches Base64, decoding is faster.
Note on Byte Size (UTF-8 vs UTF-16):
Since CJK characters typically use 3 bytes in UTF-8 but only 2 bytes in UTF-16 (or UCS-2), Cijak is highly byte-efficient only in environments that use UTF-16 (like many older Windows/Java internal systems) or where character limits are strictly enforced (like SMS). In standard UTF-8 environments, Base64 is often smaller in total byte size, but Cijak still uses 57% fewer characters.
Installation
pip install cijak
Pre-compiled C extensions (wheels) are available for:
- Linux (x86_64, aarch64)
- macOS (Intel, Apple Silicon)
- Windows (x86_64)
- Python 3.8-3.14
If a wheel isn't available, the package automatically falls back to a pure Python implementation (~300x slower, but functionally identical).
Quick Start
from cijak import Cijak
# Initialize encoder (uses CJK Unicode block by default)
encoder = Cijak()
# Encode binary data
data = b'Hello, World!'
encoded = encoder.encode(data)
print(encoded) # ㇈怙擆羼稠蔦羐漀
# Decode back to bytes
decoded = encoder.decode(encoded)
print(decoded) # b'Hello, World!'
Advanced Configuration
Custom Unicode Ranges
You can use different Unicode blocks for encoding:
# Use a different range (e.g., Hangul)
encoder = Cijak(
unicode_range_start=0xAC00, # Hangul Syllables start
unicode_range_end=0xD7A3, # Hangul Syllables end
marker_base=0x3200 # Different marker range
)
data = b"Custom encoding!"
encoded = encoder.encode(data)
Important: The Unicode range must not contain control characters. The library automatically calculates the optimal bit-packing based on your range size.
Check Current Implementation
from cijak import get_implementation
impl = get_implementation()
print(impl) # 'native' or 'fallback'
If you see 'fallback', you're using the pure Python version. Consider installing build tools to enable the C extension for 300x speedup.
Technical Deep Dive
Encoding Scheme
- Default: CJK Unified Ideographs (U+4E00 to U+9FFF)
- Bit Density: 14 bits/character (calculated from range size)
- Padding Marker: A single character (base U+31C0) stores the number of padding bits required for decoding.
- Efficiency: ~1.75 bytes per character (vs Base64's 0.75)
How It Works
- Binary data is read as a continuous stream and packed into 14-bit chunks
- Each chunk is mapped to a CJK codepoint
- First character is a marker indicating padding
- Remaining bits are left-padded in the last character
Performance Notes
- C extension: Direct memory manipulation, zero Python overhead
- Fallback: BitReader/BitWriter abstraction in pure Python
- Memory: Single-pass encoding/decoding, minimal allocations
- Thread-safe: No global state, safe for concurrent use
Building from Source
If you need to build the C extension manually:
git clone https://github.com/NobreHD/Cijak.git
cd Cijak
pip install -e .
Requirements:
- C compiler (GCC, Clang, MSVC)
- Python development headers
Contributing
Contributions welcome! Areas of interest:
- SIMD optimizations for bulk encoding
- Additional Unicode range presets
- Streaming API for large files
- Alternative padding schemes
License
GNU General Public License v3.0 or later (GPLv3+)
1 maintainer
Metadata
1 maintainer
Release files for cijak 1.0.1
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | Provenance | |
|---|---|---|---|---|
| cijak-1.0.1.tar.gz | 12.4 kB | With provenance | Details |
Built distributions (wheels)
Total release size: 492.9 kB
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