Gzip & Deflate (compress/gzip)

Industry-standard compression for HTTP responses, .gz archives, and legacy file formats (RFC 1952 / RFC 1951).

Usage

import { gzipCompress, gzipDecompress, crc32, crc32Update } from "compress/gzip";

let data = "Gzip in pure Vex!";
let ptr = data.as_ptr() as *void;
let len = data.len() as i64;

let outCap = len + (len / 65535 + 1) * 5 + 18;
let comp = alloc(outCap as u64);
let compLen = gzipCompress(ptr, len, comp, outCap);

let decomp = alloc(len as u64);
let decompLen = gzipDecompress(comp, compLen, decomp, len);

API

Function	Description
gzipCompress(src, srcLen, dst, dstCap): i64	Compress into .gz format
gzipDecompress(src, srcLen, dst, dstCap): i64	Decompress .gz data
crc32(data, len): u32	Compute CRC-32 checksum
crc32Update(crc, data, len): u32	Update a running CRC-32

Internal Architecture

File	Purpose
compress.vx	Gzip frame encoder with header/trailer
decompress.vx	Gzip frame decoder
deflate.vx	Deflate algorithm (RFC 1951) — LZ77 + Huffman
crc32.vx	CRC-32 checksum (table-driven)

Zlib Variant

A separate compress/zlib module wraps the same Deflate core with Zlib framing (RFC 1950) for compatibility with PNG and other legacy protocols.