DESCRIPTION

  zip utility from Info-ZIP

ORIGIN

  source code obtained as zip30.tar.gz
  http://infozip.sourceforge.net/Zip.html
  https://sourceforge.net/projects/infozip/files/

LOCAL CHANGES

  - Use Cosmopolitan's PCLMUL optimized CRC32
  - Don't magically append .zip extension to filename argument
  - Improve find_next_signature() performance using unlocked stdio