module Crc16

Constants

CRC_LOOKUP

Public Class Methods

check_crc16(s, expecting) click to toggle source

Returns boolean true or false if checksum of string s matches expected value

# File lib/ekm-omnimeter/crc16.rb, line 4
def self.check_crc16(s, expecting)
  (Crc16.crc16(s) == expecting)
end

crc16(buf) click to toggle source

Calculates CRC16 checksum of string buf

# File lib/ekm-omnimeter/crc16.rb, line 9
def self.crc16(buf)
  crc = 0x00
  buf.each_byte do |b|
    crc = ((crc >> 8) & 0xff) ^ CRC_LOOKUP[(crc ^ b) & 0xff]
  end
  crc
end