Question

请将CRC16的C语言算法，改造为JAVA语言算法，万分感谢！

CRC16的C语言算法：
#define PRESET_VALUE 0xFFFF
#define POLYNOMIAL 0x8408
unsigned int uiCrc16Cal(unsigned char const * pucY, unsigned char ucX)
{
unsignedchar ucI,ucJ;
unsignedshort int uiCrcValue = PRESET_VALUE;

for(ucI = 0; ucI < ucX; ucI++)
{
uiCrcValue = uiCrcValue ^ *(pucY + ucI);
for(ucJ = 0; ucJ < 8; ucJ++)
{
if(uiCrcValue& 0x0001)
{
uiCrcValue= (uiCrcValue >> 1) ^ POLYNOMIAL;
}
else
{
uiCrcValue= (uiCrcValue >> 1);
}
}
}
return uiCrcValue;
}

Answer 1

public static int CRC16(byte[] Buf, int Len) {
int CRC;
int i, Temp;
CRC = 0xffff;
for (i = 0; i < Len; i++) {
CRC = CRC ^ byteToInteger(Buf[i]);
// System.out.println(byteToInteger(Buf[i]));
for (Temp = 0; Temp < 8; Temp++) {
if ((CRC & 0x01) == 1)
CRC = (CRC >> 1) ^ 0xA001;
else
CRC = CRC >> 1;
}
}
return CRC;
}

追问

byteToInteger这个函数哪儿的？我无法引用，谢谢！

追答

// 保留低8位，转换成int型
public static int byteToInteger(byte b) {
int value;
value = b & 0xff;
return value;
}
对不起，忘了贴了