Module compression 

Production Adaptive Compression

Real compression using LZ4 (lz4_flex) and Zstd:

• Performance tier: LZ4 frame compression (~4 GB/s decompress, ~2 GB/s compress)
• Standard tier: Zstd level 1 (~500 MB/s compress, ratio ~2.5x)
• Constrained tier: off (CPU > bandwidth)

Auto-probe: если compression ratio < threshold на первых N пакетах → отключить. Минимальный размер для сжатия = 64 байт (overhead не оправдан).

Structs

AdaptiveCompressor

Adaptive compressor with auto-probe.

CompressionStats

Compression statistics for auto-probe

Enums

CompressionAlgo

Compression algorithm

CompressionError

Compression errors

Constants

MAX_DECOMPRESSED_LEN

Default upper bound on decompressed output (16 MiB — matches the established-session frame cap in TcpSessionTransport). Decompression is an asymmetric operation: a few KiB of crafted LZ4/Zstd can expand to gigabytes (a “decompression bomb”). AdaptiveCompressor::decompress enforces this cap unconditionally; callers that need a different bound use AdaptiveCompressor::decompress_with_limit.