Module: Bencode

Defined in:
lib/bencode.rb

Class Method Summary collapse

Class Method Details

.dump(obj) ⇒ Object

Bencodes obj



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# File 'lib/bencode.rb', line 183

def dump(obj)
  obj.bencode
end

.load(str) ⇒ Object

Bdecodes str

Raises:



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# File 'lib/bencode.rb', line 188

def load(str)
  require 'strscan'

  scanner = StringScanner.new(str)
  obj = parse(scanner)
  raise BdecodeError unless scanner.eos?
  return obj
end

.load_file(path) ⇒ Object

Bdecodes the file located at path



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# File 'lib/bencode.rb', line 198

def load_file(path)
  load(File.open(path).read)
end

.parse(scanner) ⇒ Object

:nodoc:



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# File 'lib/bencode.rb', line 202

def parse(scanner) # :nodoc:
  case token = scanner.scan(/[ild]|\d+:|\s/)
  when nil
    raise BdecodeError
  when "i"
    number = scanner.scan(/0|(?:-?[1-9][0-9]*)/)
    raise BdecodeError unless number and scanner.scan(/e/)
    return number.to_i
  when "l"
    ary = []
    until scanner.peek(1) == "e"
      ary.push(parse(scanner))
    end
    scanner.pos += 1
    return ary
  when "d"
    hsh = {}
    until scanner.peek(1) == "e"
      key, value = parse(scanner), parse(scanner)
      raise BdecodeError, "key must be a string" unless key.is_a? String
      hsh.store(key, value)
    end
    scanner.pos += 1
    return hsh
  when /\d+:/
    length = token.chop.to_i
    str = scanner.peek(length)
    scanner.pos += length
    return str
  when /\s/
    nil
  else
    raise BdecodeError
  end
end