Decrypting an entry's contents is by far the most expensive part of
walking an archive, and it happened for every entry before the filter
was even consulted. Now it waits until entryData()/entryCompression()
asks, so pulling just the fonts out of an updater no longer costs a
full firmware decrypt. Records are decrypted independently of each
other, so deferring one is safe.
Unpacking fonts from a 3.11 updater goes 0.365s -> 0.133s; a full
unpack is unchanged and produces identical output. The compression
counts now describe the entries we actually decoded rather than
everything in the archive.
Also adds --unpack-updater-filter to headless, which is how the above
was measured.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JvJR8oJNSCimCM9KXVLjfq
