78a5df6cf3
The fixture builder only produced stored entries, so the vendored inflate never ran under test. Add a small DEFLATE encoder and drive zip and tar.gz entries through it: round-trips for fixed and dynamic huffman, empty and large payloads, plus wrong CRC, wrong stated size, truncated and corrupted streams, and a traversal name on a compressed entry. Also cover the central directory and local header truncations that used to raise.