// hello
package datastruct

//HJ212 计算crc
func CalCRC16HJ212(data []byte) uint16 {
	var (
		crc  uint16 = 0xFFFF
		inum uint16 = 0
	)
	length := len(data)
	for i := 0; i < length; i++ {
		inum = uint16(data[i])
		crc = (crc >> 8) & 0x00FF
		crc = crc ^ inum
		for j := 0; j < 8; j++ {
			flag := crc % 2
			crc = crc >> 1
			if flag == 1 {
				crc = crc ^ 0xA001
			}
		}
	}
	return crc
}



func CalCRC16ModbusRTU(data []byte) uint16 {
	var (
		crc  uint16 = 0xFFFF
		inum uint16 = 0
	)
	length := len(data)
	for i := 0; i < length; i++ {
		inum = uint16(data[i])
		//crc = (crc >> 8) & 0x00FF
		crc ^= inum & 0x00FF
		for j := 0; j < 8; j++ {
			flag := crc % 2
			crc = crc >> 1
			if flag == 1 {
				crc = crc ^ 0xA001
			}
		}
	}
	return crc
}