Sixcy is a modern, efficient, and robust container format designed for high-performance data storage and transmission. It is built with a focus on streaming efficiency, data recoverability, and flexible compression strategies.

• Streaming-First Design: Optimized for single-pass read and write operations, making it ideal for network streams and large-scale data processing.
• Data Recoverability: Includes self-describing blocks and periodic checkpoints to ensure data can be recovered even if the archive is truncated or partially corrupted.
• Codec Polymorphism: Supports multiple compression algorithms (Zstd, LZ4, etc.) within a single archive, allowing for block-level optimization based on data type.
• Plugin Architecture: Supports third-party and proprietary compression algorithms through a well-defined plugin interface, enabling closed-source extensions to integrate seamlessly.
• Metadata-First Indexing: Provides a centralized index for fast random access and efficient file listing without scanning the entire archive.
• Rust Reference Implementation: A high-performance, memory-safe implementation that serves as the canonical reference for the Sixcy specification.

• src/: Core library and CLI implementation.
  • lib.rs: Library entry point.
  • superblock.rs: Fixed header management.
  • block.rs: Data block encoding and decoding.
  • codec/: Compression algorithm implementations and plugin interface.
  • index/: File index and metadata management.
  • recovery/: Data recovery and checkpointing logic.
  • io_stream/: High-level streaming I/O interfaces.
• tests/: Integration tests for format validation.
• benches/: Performance benchmarks for compression and I/O.
• spec.md: Detailed binary format specification.
• security.md: Public security profile and threat model.

Go to Environmental_preparation.md to view Environmental preparation

The compiled CLI tool will be available at target/release/6cy.

• .6cy container format implementation
• Streaming I/O engine
• Recovery logic
• Standard codecs (Zstd / LZ4)
• Plugin ABI for external codecs

• Proprietary codecs and optimization
• components are not part of
• the open-source tree. They can be
• integrated via the plugin interface.

cd C:\sixcy\target\release

Windows run

Linux&MacOS run

chmod +x 6cy
./6cy --help

You will see pack,unpack,list,info,optimize

• Specification: The full binary format specification is available in spec.md.
• Security: Security considerations and reporting procedures are detailed in security.md.

v0.1.x (current) Provides the reference implementation of the .6cy container format, streaming engine, and plugin interface.

This version is intended for:

• Format validation
• Integration testing
• Research and benchmarking

v0.2.0 (planned) Will introduce the official runtime package and extended codec support.

If you are looking for a ready-to-use build, please wait for the v0.2.0 release.

This project uses different licenses for the specification and the implementation:

• Specification (spec.md): Licensed under CC-BY-4.0.
• Implementation (src/, tests/, benches/, etc.): Licensed under Apache-2.0.

Sixcy - Speed, Safety, and Flexibility in Data Containment.