Module: Rpremote::Checksum

Defined in:
lib/rpremote/checksum.rb,
sig/rpremote.rbs

Class Method Summary collapse

Class Method Details

.crc16(data, initial = 0xFFFF) ⇒ Integer

Parameters:

  • data (String)
  • initial (Integer) (defaults to: 0xFFFF)

Returns:

  • (Integer) 


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# File 'lib/rpremote/checksum.rb', line 9

def crc16(data, initial = 0xFFFF)
  data.each_byte.reduce(initial) do |crc, byte|
    crc ^= byte << 8
    8.times do
      crc = if crc.nobits?(0x8000)
              crc << 1
            else
              (crc << 1) ^ 0x1021
            end
    end
    crc & 0xFFFF
  end
end

.crc32(data, initial = 0) ⇒ Integer

Parameters:

  • data (String)
  • initial (Integer) (defaults to: 0)

Returns:

  • (Integer) 


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# File 'lib/rpremote/checksum.rb', line 23

def crc32(data, initial = 0)
  Zlib.crc32(data, initial)
end