bzip2 interop checker

This helper verifies interoperability between:

V module: compress.bzip2
System CLI: bzip2
Python stdlib: bz2

It runs deterministic test vectors and compression levels, compresses each vector with all three producers, then cross-decompresses every produced stream with all three decoders.

A case passes only if every decompressed output is byte-identical to the original input.

Current levels are 1, 6, and 9 (see compression_levels in vlib/compress/bzip2/interop/bzip2_interop_check.vsh).

Run

v run vlib/compress/bzip2/interop/bzip2_interop_check.vsh

Requirements

bzip2 available in PATH
python3 with bz2