Class: Rbkb::Cli::Bgrep

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

Overview

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

searches for a binary string in input. string can be provided ‘hexified’

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) ⇒ Bgrep

Returns a new instance of Bgrep.



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

def initialize(*args)
  super(*args) do |this|
    this.opts[:start_off] ||= 0
    this.opts[:end_off] ||= -1
    this.opts[:include_fname] ||= true
  end
end

Instance Method Details

#go(*args) ⇒ Object 



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# File 'lib/rbkb/cli/bgrep.rb', line 53

def go(*args)
  super(*args)

  if @opts[:hex]
    bail "you specified -x for hex and the subject isn't" unless @find.ishex?
    @find = @find.unhexify
  elsif @opts[:rx]
    @find = Regexp.new(@find, Regexp::MULTILINE)
  end

  if fname = @argv.shift
    dat = do_file_read(fname)
    fname = nil unless @argv[0] # only print filenames for multiple files
  else
    dat = @stdin.read
  end

  loop do 
    dat.bgrep(@find, @opts[:align]) do |hit_start, hit_end, match|
      @stdout.write "#{fname}:" if fname and @opts[:include_fname]

      @stdout.write(
        "#{(hit_start).to_hex.rjust(8,"0")}:"+
        "#{(hit_end).to_hex.rjust(8,"0")}:b:"+
        "#{match.inspect}\n")
    end

    break unless fname=@argv.shift
    dat = do_file_read(fname)
  end
  self.exit(0)
end

#make_parser ⇒ Object 



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# File 'lib/rbkb/cli/bgrep.rb', line 16

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

  arg.on("-x", "--[no-]hex", "Search for hex (default: false)") do |x|
    @opts[:hex] = x
  end

  arg.on("-r", "--[no-]regex", "Search for regex (default: false)") do |r|
    @opts[:rx] = r
  end

  arg.on("-a", "--align=BYTES", Numeric, 
         "Only match on alignment boundary") do |a|
    @opts[:align] = a
  end

  arg.on("-n", "--[no-]filename", 
         "Toggle filenames. (Default: #{@opts[:include_fname]})") do |n|
    @opts[:include_fname] = n
  end
  return arg
end

#parse(*args) ⇒ Object 



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# File 'lib/rbkb/cli/bgrep.rb', line 41

def parse(*args)
  super(*args)

  bail "need search argument" unless @find = @argv.shift

  if @opts[:hex] and @opts[:rx]
    bail "-r and -x are mutually exclusive"
  end

  # ... filenames vs. stdin will be parsed in 'go'
end