libcompress 1.2.0

Pure Dart implementations of LZ4, Snappy, GZIP, and Zstd compression algorithms with no native dependencies.

1.0.0

• Initial release with pure Dart compression implementations (no native dependencies; runs on the Dart VM and dart2js/web)
• LZ4: Full frame format support with configurable block sizes (64K, 256K, 1M, 4M) and compression levels 1-9 (HC mode); block decode accepts concatenated frames
• Snappy: Raw block format and streaming (framing) format with CRC32C checksums
• GZIP: Pure Dart DEFLATE implementation with compression levels 1-9, optional filename/comment metadata, multi-member support
• Zstd: Practical subset of RFC 8878 with FSE/Huffman entropy coding, sequence encoding, repeat offsets, and compression levels 1-22 (dictionary-compressed frames are not supported and are rejected on decode)
• Stream-based APIs for all codecs via CompressionStreamCodec, with backpressure and an optional verified (all-or-nothing) mode that withholds output until checksums validate
• Common codec interface via CompressionCodec; CodecFactory.codec/streaming accept maxDecompressedSize/maxBufferSize/verified for central limit enforcement
• Security: all decompressors enforce a configurable maxDecompressedSize (cumulative across frames/members); streaming decode is incremental and memory-bounded
• Observability: Zstd exposes a compressed-block fallback counter, onFallback hook, and opt-in strict mode
• CLI tool (libcompress) for all codecs, with atomic output (temp file + rename, cleanup on error) and an opt-in --verified flag
• CLI compatibility verified with the native lz4, gzip, snzip, and zstd tools

1.1.0

• Major cleanup and bug fixes.
• Better streaming and more deterministic behavior

1.2.0

• LZ4: Lz4Codec.compressBlock/decompressBlock expose the raw LZ4 block format (the bare LZ77 token stream, no frame header/checksum) for containers that supply their own framing.