Class: Rbkb::Cli::Rstrings

Inherits:
Executable show all
Defined in:
lib/rbkb/cli/rstrings.rb

Overview

Copyright 2009 emonti at matasano.com See README.rdoc for license information

rstrings is Unix "strings" in ruby... with some extra stuff

Instance Attribute Summary

Attributes inherited from Executable

#argv, #exit_status, #oparse, #opts, #stderr, #stdin, #stdout

Instance Method Summary collapse

Methods inherited from Executable

#bail, #bail_args, #exit, run

Constructor Details

#initialize(*args) ⇒ Rstrings

Returns a new instance of Rstrings.



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# File 'lib/rbkb/cli/rstrings.rb', line 8

def initialize(*args)
  super(*args) do |this|
    {
      start_off: 0,
      end_off: -1,
      encoding: :both,
      minimum: 6,
      indat: [],
      fnames: []
    }.each { |k, v| this.opts[k] ||= v }

    yield this if block_given?
  end
end

Instance Method Details

#go(*args) ⇒ Object 



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# File 'lib/rbkb/cli/rstrings.rb', line 71

def go(*args)
  super(*args)

  start_off = @opts[:start_off]
  end_off   = @opts[:end_off]
  enc  = @opts[:encoding]
  min  = @opts[:minimum]
  align = @opts[:align]

  @opts[:pr_fnames] = true if @opts[:fnames].size > 1

  i = 0
  while buf = @opts[:indat].shift
    buf[start_off..end_off].strings(
      encoding: enc,
      minimum: min,
      align: align
    ) do |off, len, type, str|
      @stdout << "#{@opts[:fnames][i]}:" if @opts[:pr_fnames]
      @stdout << "#{(off + start_off).to_hex.rjust(8, '0')}:" +
                 "#{(len + start_off).to_hex.rjust(8, '0')}:" +
                 "#{type.to_s[0, 1]}:#{str.delete("\x00").inspect}\n"
    end
    i += 1
  end

  self.exit(0)
end

#make_parser ⇒ Object 



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# File 'lib/rbkb/cli/rstrings.rb', line 23

def make_parser
  arg = super()
  arg.banner += ' <file ... || blank for stdin>'

  arg.on('-s', '--start=OFFSET', 'Start at offset') do |s|
    unless m = /^(?:(\d+)|0x([A-Fa-f0-9]+))$/.match(s)
      bail "invalid offset '#{s}'"
    end
    @opts[:start_off] = m[2] ? m[0].hex : m[0].to_i
  end

  arg.on('-e', '--end=OFFSET', 'End at offset') do |e|
    unless m = /^(?:(\d+)|0x([A-Fa-f0-9]+))$/.match(e)
      bail "invalid offset '#{e}'"
    end
    @opts[:end_off] = m[2] ? m[0].hex : m[0].to_i
  end

  arg.on('-t', '--encoding-type=TYPE',
         "Encoding: ascii/unicode/both (default=#{@opts[:encoding]})") do |t|
    @opts[:encoding] = t.to_sym
  end

  arg.on('-l', '--min-length=NUM', Numeric,
         "Minimum length of strings (default=#{@opts[:minimum]})") do |l|
    @opts[:minimum] = l
  end

  arg
end

#parse(*args) ⇒ Object 



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# File 'lib/rbkb/cli/rstrings.rb', line 54

def parse(*args)
  super(*args)
  if @opts[:indat].empty? and !@argv.empty?
    while a = @argv.shift
      @opts[:indat] << do_file_read(a)
      @opts[:fnames] << a
    end
  end

  parse_catchall

  return unless @opts[:indat].empty?

  @opts[:indat] << @stdin.read if @opts[:indat].empty?
  @opts[:fnames] << '[STDIN]'
end