# This deco extension unpacks .st disk images.

# .st disk images are sector-by-sector raw images (e.g. from dd) of
# Atari ST floppy disks.  As long as the image file is intact and the disk
# image has a recognisable FAT filesystem on it (which is untrue for some
# games, demos and "CD" disks) then the files should be unpacked OK.

# Dependencies:

# mtools (tested on mcopy version 3.9.9)
# deco count_files function

decompress() {
  beforefiles="`count_files .`"  # keep a record of how many files we have
  MTOOLS_SKIP_CHECK=1 mcopy -i "${1}" \
    -s -p -n ${Verbose+-v} ::. .

  eval "case \`count_files .\` in
  ${beforefiles})  exit 1 ;;     # mtools succeeds even if no files were
  esac"                          # extracted, so we signal an error
}