lz4.hpp File Reference

LZ4 raw-block compression codec for Signet Forge (wraps liblz4). More...

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Detailed Description

LZ4 raw-block compression codec for Signet Forge (wraps liblz4).

Thin wrapper around liblz4 providing LZ4 raw block compression and decompression conforming to the CompressionCodec interface. Conditionally compiled when SIGNET_HAS_LZ4 is defined (set by CMake when the lz4 dependency is found via SIGNET_ENABLE_LZ4=ON).

Parquet LZ4 variants

The Parquet spec defines two LZ4 enum values:

• Compression::LZ4 (value 5) – legacy, Hadoop-compatible, sometimes framed
• Compression::LZ4_RAW (value 7) – raw block format (preferred for modern Parquet)

This codec implements LZ4_RAW (raw block format), which is the standard for modern Parquet files.

Usage

signet::forge::register_lz4_codec();   // once at startup
// Then use compress()/decompress() via the CodecRegistry automatically.

See also

CompressionCodec, CodecRegistry, register_lz4_codec()

Definition in file lz4.hpp.