Class: ZSteg::CLI::Reflow

Inherits:
Object
  • Object
show all
Defined in:
lib/zsteg/cli/reflow.rb

Constant Summary collapse

DEFAULT_ACTIONS = 
%w'reflow'

Instance Method Summary collapse

Constructor Details

#initialize(argv = ARGV) ⇒ Reflow

Returns a new instance of Reflow.



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# File 'lib/zsteg/cli/reflow.rb', line 10

def initialize argv = ARGV
  @argv = argv
  @cache = {}
  @wasfiles = Set.new
end

Instance Method Details

#load_image(fname) ⇒ Object 



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# File 'lib/zsteg/cli/reflow.rb', line 125

def load_image fname
  if File.directory?(fname)
    puts "[?] #{fname} is a directory".yellow
  else
    ZPNG::Image.load(fname)
  end
rescue ZPNG::Exception, Errno::ENOENT
  puts "[!] #{$!.inspect}".red
end

#parse_dimension(s) ⇒ Object 



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# File 'lib/zsteg/cli/reflow.rb', line 114

def parse_dimension s
  s.split(',').map do |x|
    case x
    when /\A\d+\Z/        # single value
      x.to_i
    when /-/              # range
      Range.new(*x.split('-').map(&:to_i)).to_a
    end
  end.flatten.uniq
end

#reflow ⇒ Object

actions



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# File 'lib/zsteg/cli/reflow.rb', line 138

def reflow
  if @image.format != :bmp
    STDERR.puts "[!] only BMP format supported for now!"
    return
  end

  sl = @image.scanlines.first
  @bpp = sl.bpp
  @old_significant_sl_bytes = (sl.width*sl.bpp/8.0).ceil
  @old_total_sl_bytes       = sl.size

  if @options[:heights]
    @options[:heights].each do |h|
      t = 1.0*@image.width*@image.height/h
      t.floor.upto(t.ceil).each do |w|
        next if @options[:widths] && !@options[:widths].include?(w)
        _reflow w,h
      end
    end
  elsif @options[:widths]
    @options[:widths].each do |w|
      h = @image.width*@image.height/w
      _reflow w,h
    end
  elsif @options[:try_all]
    # enum all
    2.upto(@image.width*@image.height/2) do |w|
      h = @image.width*@image.height/w
      _reflow w,h
    end
  else
    # smart all
    w = 4
    loop do
      h = @image.width*@image.height/w
      break if h < 4
      _reflow w,h
      w += 1
    end
  end
end

#run ⇒ Object 



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# File 'lib/zsteg/cli/reflow.rb', line 16

def run
  @actions = []
  @options = {
    :verbose   => 0,
  }
  optparser = OptionParser.new do |opts|
    opts.banner = "Usage: #{File.basename($0)} [options] filename.png [param_string]"
    opts.separator ""

    opts.on( "-W", "--width X", "reflow to specified width(s)",
                                "single value: '999', range: '100-200'",
                                "or comma-separated: '100,200,300-350'"
    ) do |x|
#          if @options[:heights]
#            STDERR.puts "[!] width _OR_ height can be set".red
#            exit 1
#          end
      @options[:widths] = parse_dimension(x)
    end

    opts.on "-H", "--height X", "reflow to specified height(s)" do |x|
#          if @options[:widths]
#            STDERR.puts "[!] width _OR_ height can be set".red
#            exit 1
#          end
      @options[:heights] = parse_dimension(x)
    end

    opts.separator ""

    opts.on "-a", "--all", "try all possible sizes" do
      @options[:try_all] = true
    end

    opts.on "-r", "--rewrite", "just rewrite the header, keeping imagedata as-is" do
      @options[:rewrite] = true
    end

    opts.separator ""

    opts.on "-O", "--outfile FILENAME", "output single result to specified file" do |x|
      @options[:outfile] = x
    end

    opts.on "-D", "--dir DIRNAME", "output multiple results to specified dir" do |x|
      @options[:dir] = x
    end

    opts.separator ""
    opts.on "-v", "--verbose", "Run verbosely (can be used multiple times)" do |v|
      @options[:verbose] += 1
    end
    opts.on "-q", "--quiet", "Silent any warnings (can be used multiple times)" do |v|
      @options[:verbose] -= 1
    end
    opts.on "-C", "--[no-]color", "Force (or disable) color output (default: auto)" do |x|
      if defined?(Rainbow) && Rainbow.respond_to?(:enabled=)
        Rainbow.enabled = x
      else
        Sickill::Rainbow.enabled = x
      end
    end
  end

  if (argv = optparser.parse(@argv)).empty?
    puts optparser.help
    return
  end

  @actions = DEFAULT_ACTIONS if @actions.empty?

  argv.each do |arg|
    if arg[','] && !File.exist?(arg)
      @options.merge!(decode_param_string(arg))
      argv.delete arg
    end
  end

  argv.each_with_index do |fname,idx|
    if argv.size > 1 && @options[:verbose] >= 0
      puts if idx > 0
      puts "[.] #{fname}".green
    end
    next unless @image=load_image(@fname=fname)

    @actions.each do |action|
      if action.is_a?(Array)
        self.send(*action) if self.respond_to?(action.first)
      else
        self.send(action) if self.respond_to?(action)
      end
    end
  end
rescue Errno::EPIPE
  # output interrupt, f.ex. when piping output to a 'head' command
  # prevents a 'Broken pipe - <STDOUT> (Errno::EPIPE)' message
end