Java 实现多字节移位操作

////算法很简单，就是每移一个字节，保留移位溢出的BIT 位，保存为一个字节以备和下一个字节进行组合。
public static void main(String[] args) {
		byte [] data = Hex.fromString("00E8080000000065289BBAEF2EC78CCD0F13571AD01BAE68000001BBB00818");
		byte [] out = rightShift(data,(byte) 3);
		System.out.println(Hex.toString(out));
	}
public static byte[] rightShift(byte [] data , byte shiftVal){
		//						 	    
		// 00E80800 - > 0000 0000 1110 1000 0000 1000|||| left shift - 5 ----->  0001 1101 00
		byte [] out = new byte[data.length +1];
		int offset = 0;
		byte first = (byte) ( ((data[0]&0xff )>> shiftVal) );
		out[offset++] = first;
		for (int i = 0 ; i < data.length-1 ; i++){
			// right shift 3 
			// get last 3bits of this byte .combine these 3 bit as a byte.
			//  that byte OR the next shifted[3] byte	  
			//---------------
			//overflowed 3 bit
			byte overflowed = (byte) ((data[i]&0xff) << (8-shiftVal));
			byte next = (byte) (overflowed | ((data[i+1]&0xff)>>shiftVal));
			
			out[offset++] = next;
		}
		return out;
	}