std/compress - owned gzip encoding: pure Zig, no libc, freestanding-safe. One-shot gzip for bodies of any size: input chunks at FF_BLOCK_CAP (65535 bytes — the ff_tok capacity bound) into a multi-block DEFLATE stream, absolute positions keeping the 32KB match window live across block boundaries. Dynamic Huffman with a per-worker cached tree reused while a used-symbol mask stays inside the tree's coverage; fixed Huffman below 64 bytes where the tree header costs more than it saves. The trailer folds through PMULL on aarch64-crypto targets, PCLMULQDQ on x86_64 where CPUID reports it, and a slicing-by-8 table elsewhere. const n = std_compress.gzipInto(body, out_buf); if (n == 0) // out buffer too small

// Koru-level entry: `~std/compress:gzip(data)` — allocates into the
// program's allocator and returns a shrunk slice. Any input size compresses:
// the stream chunks into as many DEFLATE blocks as it needs.
~pub tor gzip { data: string<*> }
| compressed { data: string, original_size: usize }
| error string

// CRC32 of arbitrary bytes — the trailer's checksum exposed as its own
// surface: wire receivers verify gzip streams, tests pin compressed output
// without an inflater, and callers on the buffer API can stamp their own
// trailers. `string<*>` admits borrowed views and obligated buffers alike.
~pub tor crc32 { data: string<*> } -> usize