Module: Fargo::Utils

Included in:
Protocol::Download, Protocol::Hub
Defined in:
lib/fargo/utils.rb

Instance Method Summary collapse

Instance Method Details

#encode_char(c) ⇒ Object

Watch out for those special ones…



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# File 'lib/fargo/utils.rb', line 28

def encode_char c
  if [0, 5, 36, 96, 124, 126].include? c
    sprintf '/%%DCN%03d%%/', c
  else
    c.chr
  end
end

#generate_key(lock) ⇒ Object

Lord knows why they’re doing this…



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# File 'lib/fargo/utils.rb', line 5

def generate_key lock
  lock_bytes = lock.bytes.to_a
  bytes = []
  bytes << (lock_bytes[0] ^ lock_bytes[-1] ^ lock_bytes[-2] ^ 5)

  (1..lock.length-1).each{ |i|
    bytes << (lock_bytes[i] ^ lock_bytes[i - 1])
  }

  key = ''
  bytes.each{ |b| key << encode_char(((b << 4) | (b >> 4)) & 0xff) }
  key
end

#generate_lock ⇒ Object

Generates a lock between 80 and 134 random characters, and a pk of 16 random characters. At least in theory, other clients were doing exactly this, so I just mirrored them.



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# File 'lib/fargo/utils.rb', line 22

def generate_lock
  lock = 'EXTENDEDPROTOCOL'
  [lock + ('ABC' * 6), 'ABCD' * 4]
end