adb-backup

#!/usr/bin/env ruby
require 'zlib'

BLOCK_SIZE = 512*1024
args = ARGV

if args.empty?
  puts "usage: adb-backup-extract [options] <file.backup>"
  puts
  puts "options:"
  puts "  -l   List contents"
  puts "  -c   Convert to .tar.xz archive"
  puts "  -x   Extract archive to current directory"
  puts
else
  opts, args = args.partition { |arg| arg[/^-\w/] }

  args.each do |arg|

    if opts.include?("--to-xz") or opts.include?("-c")
      cmd = ["pixz", "-o", "#{arg}.tar.xz"]
    else
      if opts.include?("-v") or opts.include?("-l")
        cmd = ["tar", "-tv"]
      elsif opts.include("-x") or opts.include("-e")
        cmd = ["tar", "-xv"]
      else
        puts "Unrecognized option: #{opts}"
        exit 1
      end
    end

    puts "#{arg} => #{cmd}"

    open(arg, "rb") do |f|
      head = f.read(24)
      #p header_valid: (head == "ANDROID BACKUP\n1\n1\nnone\n")
 
      zlib = Zlib::Inflate.new

      IO.popen(cmd, "w") do |tar|
        until f.eof?
          zlib << f.read(BLOCK_SIZE)
          tar.write zlib.flush_next_out
        end
      end
    end
  end
  #dd if="$1" bs=24 skip=1 2>/dev/null | openssl zlib -d | tar $TAR_OPTS -
end