CAN总线上的消息单帧某个信号的值计算（C#）

         public static ulong GetMotorolaSignalValue(byte[] data, int startBit, int bitLength) {
             ulong canSignalValue = ;
             for (int i = data.Length - , j =; i >= ; i--, j++) {
                 canSignalValue += (ulong)data[j] << i * ;
             }
 
             int x = startBit / ;
             int y = startBit % ;
             int z = x *  +  - y;
             int rightMoveCount = data.Length *  - z;
 
             canSignalValue >>= rightMoveCount;
 
             return canSignalValue & ulong.MaxValue >>  - bitLength;
         }
 
         public static ulong GetIntelSignalValue(byte[] data, int startBit, int bitLength) {
             ulong canSignalValue = ;
             for (int i = data.Length - ; i >= ; i--) {
                 canSignalValue += (ulong)data[i] << i * ;
             }
 
             int x = startBit / ;
             int y = startBit % ;
 
             int rightMoveCount = x *  + y;
 
             canSignalValue >>= rightMoveCount;
 
             return canSignalValue & ulong.MaxValue >>  - bitLength;
         }