Ruby实现计算CRC16校验码

#计算CRC16
def crc(num)
	crcnum=0xFFFF	
	num.each do|i|
		crcnum=crcnum^((i.to_i)&0x00ff)
		1.upto(8) do 
			if (crcnum&0x0001)!=0 then
				crcnum=(crcnum>>1)^0x8005
			 else
				crcnum=crcnum>>1
			end
		end
	end
	return crcnum
end

#测试
#要计算的数据
dd=[20, 03, 01, 40, 00, 15]

sum= crc(dd)
#打印结果
puts "十进制:"+ sum.to_s
puts "十六进制:0x"+ sum.to_s(16)

#获取低8位
puts "0x"+ ((sum>>0)&0x00FF).to_s(16)
#获取高8位
puts "0x"+ ((sum>>8)&0x00FF).to_s(16)