光盘轨道映射为回环设备 #disc #optical

disc-multi

#!/bin/env ruby

require 'shellwords'

if ARGV.empty?
  puts "Usage: #{$0} <drive-device>"
  exit 1
end

drive = ARGV[0]

class Track
  # `start_addr`, `end_addr` and `size` are in sectors
  attr_accessor :track_no, :session_no, :start_addr, :end_addr, :size

  def initialize(track_no, session_no, start_addr, end_addr, size)
    @track_no = track_no
    @session_no = session_no
    @start_addr = start_addr
    @end_addr = end_addr
    @size = size
  end
end

# @type [String]
minfo = `wodim dev=#{Shellwords.escape drive} -minfo`
extracted_lines = minfo.lines(chomp: true)
                       .drop_while { |x| not /Track +Sess +Type +Start Addr +End Addr +Size/.match? x }
                       .drop(2).take_while { |x| not x.empty? }

filtered_lines = []
# @type [Array<Track>]
tracks = []
extracted_lines.each do |line|
  captured = / *(\d+) +(\d+) +Data +(\d+) +(\d+) +(\d+)/.match(line)
  next if captured == nil
  track = Track.new(captured[1].to_i, captured[2].to_i, captured[3].to_i, captured[4].to_i, captured[5].to_i)
  tracks.push track
  filtered_lines.push line
end

puts <<EOF
Track  Sess Type   Start Addr End Addr   Size
==============================================
EOF
puts filtered_lines
puts

STDOUT.write 'Please pick a track (input the track number): '
STDOUT.flush

input = STDIN.readline
# @type [Track]
found_track = tracks.find { |x| x.track_no == input.to_i }
if found_track == nil
  puts 'No track was found'
  exit 1
end
puts found_track.inspect

puts `sudo losetup -f #{Shellwords.escape drive} --sizelimit #{found_track.size * 2048} --offset #{found_track.start_addr * 2048} --sector-size 2048 --read-only --show`