Java CRC-16 工具类
/**
* CRC-16
*
* <table width="400px" border="1" cellpadding="0" cellspacing="0">
* <tr>
* <th>名称</th>
* <th>多项式</th>
* <th>初始值</th>
* <th>异或值</th>
* <th>Bit反转</th>
* </tr>
* <tr>
* <td> CRC-16/IBM</td>
* <td align="center">0x8005</td>
* <td align="center">0x0000</td>
* <td align="center">0x0000</td>
* <td align="center">LSB First</td>
* </tr>
* <tr>
* <td> CRC-16/CCITT</td>
* <td align="center">0x1021</td>
* <td align="center">0x0000</td>
* <td align="center">0x0000</td>
* <td align="center">LSB First</td>
* </tr>
* <tr>
* <td> CRC-16/CCITT-FALSE</td>
* <td align="center">0x1021</td>
* <td align="center">0xFFFF</td>
* <td align="center">0x0000</td>
* <td align="center">MSB First</td>
* </tr>
* <tr>
* <td> CRC-16/DECT R</td>
* <td align="center">0x0589</td>
* <td align="center">0x0000</td>
* <td align="center">0x0001</td>
* <td align="center">MSB First</td>
* </tr>
* <tr>
* <td> CRC-16/DECT X</td>
* <td align="center">0x0589</td>
* <td align="center">0x0000</td>
* <td align="center">0x0000</td>
* <td align="center">MSB First</td>
* </tr>
* <tr>
* <td> CRC-16/DNP</td>
* <td align="center">0x3D65</td>
* <td align="center">0x0000</td>
* <td align="center">0xFFFF</td>
* <td align="center">LSB First</td>
* </tr>
* <tr>
* <td> CRC-16/GENIBUS</td>
* <td align="center">0x1021</td>
* <td align="center">0xFFFF</td>
* <td align="center">0xFFFF</td>
* <td align="center">MSB First</td>
* </tr>
* <tr>
* <td> CRC-16/MAXIM</td>
* <td align="center">0x8005</td>
* <td align="center">0x0000</td>
* <td align="center">0xFFFF</td>
* <td align="center">LSB First</td>
* </tr>
* <tr>
* <td> CRC-16/MODBUS</td>
* <td align="center">0x8005</td>
* <td align="center">0xFFFF</td>
* <td align="center">0x0000</td>
* <td align="center">LSB First</td>
* </tr>
* <tr>
* <td> CRC-16/USB</td>
* <td align="center">0x8005</td>
* <td align="center">0xFFFF</td>
* <td align="center">0xFFFF</td>
* <td align="center">LSB First</td>
* </tr>
* <tr>
* <td> CRC-16/X25</td>
* <td align="center">0x1021</td>
* <td align="center">0xFFFF</td>
* <td align="center">0xFFFF</td>
* <td align="center">LSB First</td>
* </tr>
* <tr>
* <td> CRC-16/XMODEM</td>
* <td align="center">0x1021</td>
* <td align="center">0x0000</td>
* <td align="center">0x0000</td>
* <td align="center">MSB First</td>
* </tr>
* </table>
*
* @author unnamed
*
*/
public class CRC16Utils {
/**
* CRC-16/IBM
*
* <table width="400px" border="1" cellpadding="0" cellspacing="0">
* <tr>
* <th>多项式</th>
* <th>初始值</th>
* <th>异或值</th>
* <th>Bit反转</th>
* </tr>
* <tr>
* <td align="center">0x8005</td>
* <td align="center">0x0000</td>
* <td align="center">0x0000</td>
* <td align="center">LSB First</td>
* </tr>
* </table>
*
* @param source
* @param offset
* @param length
* @return
*/
public static int CRC16_IBM(byte[] source, int offset, int length) {
int wCRCin = 0x0000;
// Integer.reverse(0x8005) >>> 16
int wCPoly = 0xA001;
for (int i = offset, cnt = offset + length; i < cnt; i++) {
wCRCin ^= ((int) source[i] & 0x00FF);
for (int j = 0; j < 8; j++) {
if ((wCRCin & 0x0001) != 0) {
wCRCin >>= 1;
wCRCin ^= wCPoly;
} else {
wCRCin >>= 1;
}
}
}
return wCRCin ^= 0x0000;
}
/**
* CRC-16/CCITT
*
* <table width="400px" border="1" cellpadding="0" cellspacing="0">
* <tr>
* <th>多项式</th>
* <th>初始值</th>
* <th>异或值</th>
* <th>Bit反转</th>
* </tr>
* <tr>
* <td align="center">0x1021</td>
* <td align="center">0x0000</td>
* <td align="center">0x0000</td>
* <td align="center">LSB First</td>
* </tr>
* </table>
*
* @param source
* @param offset
* @param length
* @return
*/
public static int CRC16_CCITT(byte[] source, int offset, int length) {
int wCRCin = 0x0000;
// Integer.reverse(0x1021) >>> 16
int wCPoly = 0x8408;
for (int i = offset, cnt = offset + length; i < cnt; i++) {
wCRCin ^= ((int) source[i] & 0x00FF);
for (int j = 0; j < 8; j++) {
if ((wCRCin & 0x0001) != 0) {
wCRCin >>= 1;
wCRCin ^= wCPoly;
} else {
wCRCin >>= 1;
}
}
}
return wCRCin ^= 0x0000;
}
/**
* CRC-16/CCITT-FALSE
*
* <table width="400px" border="1" cellpadding="0" cellspacing="0">
* <tr>
* <th>多项式</th>
* <th>初始值</th>
* <th>异或值</th>
* <th>Bit反转</th>
* </tr>
* <tr>
* <td align="center">0x1021</td>
* <td align="center">0xFFFF</td>
* <td align="center">0x0000</td>
* <td align="center">MSB First</td>
* </tr>
* </table>
*
* @param source
* @param offset
* @param length
* @return
*/
public static int CRC16_CCITT_FALSE(byte[] source, int offset, int length) {
int wCRCin = 0xFFFF;
int wCPoly = 0x1021;
for (int i = offset, cnt = offset + length; i < cnt; i++) {
for (int j = 0; j < 8; j++) {
boolean bit = ((source[i] >> (7 - j) & 1) == 1);
boolean c15 = ((wCRCin >> 15 & 1) == 1);
wCRCin <<= 1;
if (c15 ^ bit)
wCRCin ^= wCPoly;
}
}
wCRCin &= 0xFFFF;
return wCRCin ^= 0x0000;
}
/**
* CRC-16/DECT R
*
* <table width="400px" border="1" cellpadding="0" cellspacing="0">
* <tr>
* <th>多项式</th>
* <th>初始值</th>
* <th>异或值</th>
* <th>Bit反转</th>
* </tr>
* <tr>
* <td align="center">0x0589</td>
* <td align="center">0x0000</td>
* <td align="center">0x0001</td>
* <td align="center">MSB First</td>
* </tr>
* </table>
*
* @param source
* @param offset
* @param length
* @return
*/
public static int CRC16_DECT_R(byte[] source, int offset, int length) {
int wCRCin = 0x0000;
int wCPoly = 0x0589;
for (int i = offset, cnt = offset + length; i < cnt; i++) {
for (int j = 0; j < 8; j++) {
boolean bit = ((source[i] >> (7 - j) & 1) == 1);
boolean c15 = ((wCRCin >> 15 & 1) == 1);
wCRCin <<= 1;
if (c15 ^ bit)
wCRCin ^= wCPoly;
}
}
wCRCin &= 0xFFFF;
return wCRCin ^= 0x0001;
}
/**
* CRC-16/DECT X
*
* <table width="400px" border="1" cellpadding="0" cellspacing="0">
* <tr>
* <th>多项式</th>
* <th>初始值</th>
* <th>异或值</th>
* <th>Bit反转</th>
* </tr>
* <tr>
* <td align="center">0x0589</td>
* <td align="center">0x0000</td>
* <td align="center">0x0000</td>
* <td align="center">MSB First</td>
* </tr>
* </table>
*
* @param source
* @param offset
* @param length
* @return
*/
public static int CRC16_DECT_X(byte[] source, int offset, int length) {
int wCRCin = 0x0000;
int wCPoly = 0x0589;
for (int i = offset, cnt = offset + length; i < cnt; i++) {
for (int j = 0; j < 8; j++) {
boolean bit = ((source[i] >> (7 - j) & 1) == 1);
boolean c15 = ((wCRCin >> 15 & 1) == 1);
wCRCin <<= 1;
if (c15 ^ bit)
wCRCin ^= wCPoly;
}
}
wCRCin &= 0xFFFF;
return wCRCin ^= 0x0000;
}
/**
* CRC-16/DNP
*
* <table width="400px" border="1" cellpadding="0" cellspacing="0">
* <tr>
* <th>多项式</th>
* <th>初始值</th>
* <th>异或值</th>
* <th>Bit反转</th>
* </tr>
* <tr>
* <td align="center">0x3D65</td>
* <td align="center">0x0000</td>
* <td align="center">0xFFFF</td>
* <td align="center">LSB First</td>
* </tr>
* </table>
*
* @param source
* @param offset
* @param length
* @return
*/
public static int CRC16_DNP(byte[] source, int offset, int length) {
int wCRCin = 0x0000;
// Integer.reverse(0x3D65) >>> 16
int wCPoly = 0xA6BC;
for (int i = offset, cnt = offset + length; i < cnt; i++) {
wCRCin ^= ((int) source[i] & 0x00FF);
for (int j = 0; j < 8; j++) {
if ((wCRCin & 0x0001) != 0) {
wCRCin >>= 1;
wCRCin ^= wCPoly;
} else {
wCRCin >>= 1;
}
}
}
return wCRCin ^= 0xFFFF;
}
/**
* CRC-16/GENIBUS
*
* <table width="400px" border="1" cellpadding="0" cellspacing="0">
* <tr>
* <th>多项式</th>
* <th>初始值</th>
* <th>异或值</th>
* <th>Bit反转</th>
* </tr>
* <tr>
* <td align="center">0x1021</td>
* <td align="center">0xFFFF</td>
* <td align="center">0xFFFF</td>
* <td align="center">MSB First</td>
* </tr>
* </table>
*
* @param source
* @param offset
* @param length
* @return
*/
public static int CRC16_GENIBUS(byte[] source, int offset, int length) {
int wCRCin = 0xFFFF;
int wCPoly = 0x1021;
for (int i = offset, cnt = offset + length; i < cnt; i++) {
for (int j = 0; j < 8; j++) {
boolean bit = ((source[i] >> (7 - j) & 1) == 1);
boolean c15 = ((wCRCin >> 15 & 1) == 1);
wCRCin <<= 1;
if (c15 ^ bit)
wCRCin ^= wCPoly;
}
}
wCRCin &= 0xFFFF;
return wCRCin ^= 0xFFFF;
}
/**
* CRC-16/MAXIM
*
* <table width="400px" border="1" cellpadding="0" cellspacing="0">
* <tr>
* <th>多项式</th>
* <th>初始值</th>
* <th>异或值</th>
* <th>Bit反转</th>
* </tr>
* <tr>
* <td align="center">0x8005</td>
* <td align="center">0x0000</td>
* <td align="center">0xFFFF</td>
* <td align="center">LSB First</td>
* </tr>
* </table>
*
* @param source
* @param offset
* @param length
* @return
*/
public static int CRC16_MAXIM(byte[] source, int offset, int length) {
int wCRCin = 0x0000;
// Integer.reverse(0x8005) >>> 16
int wCPoly = 0xA001;
for (int i = offset, cnt = offset + length; i < cnt; i++) {
wCRCin ^= ((int) source[i] & 0x00FF);
for (int j = 0; j < 8; j++) {
if ((wCRCin & 0x0001) != 0) {
wCRCin >>= 1;
wCRCin ^= wCPoly;
} else {
wCRCin >>= 1;
}
}
}
return wCRCin ^= 0xFFFF;
}
/**
* CRC-16/MODBUS
*
* <table width="400px" border="1" cellpadding="0" cellspacing="0">
* <tr>
* <th>多项式</th>
* <th>初始值</th>
* <th>异或值</th>
* <th>Bit反转</th>
* </tr>
* <tr>
* <td align="center">0x8005</td>
* <td align="center">0xFFFF</td>
* <td align="center">0x0000</td>
* <td align="center">LSB First</td>
* </tr>
* </table>
*
* @param source
* @param offset
* @param length
* @return
*/
public static int CRC16_MODBUS(byte[] source, int offset, int length) {
int wCRCin = 0xFFFF;
// Integer.reverse(0x8005) >>> 16
int wCPoly = 0xA001;
for (int i = offset, cnt = offset + length; i < cnt; i++) {
wCRCin ^= ((int) source[i] & 0x00FF);
for (int j = 0; j < 8; j++) {
if ((wCRCin & 0x0001) != 0) {
wCRCin >>= 1;
wCRCin ^= wCPoly;
} else {
wCRCin >>= 1;
}
}
}
return wCRCin ^= 0x0000;
}
/**
* CRC-16/USB
*
* <table width="400px" border="1" cellpadding="0" cellspacing="0">
* <tr>
* <th>多项式</th>
* <th>初始值</th>
* <th>异或值</th>
* <th>Bit反转</th>
* </tr>
* <tr>
* <td align="center">0x8005</td>
* <td align="center">0xFFFF</td>
* <td align="center">0xFFFF</td>
* <td align="center">LSB First</td>
* </tr>
* </table>
*
* @param source
* @param offset
* @param length
* @return
*/
public static int CRC16_USB(byte[] source, int offset, int length) {
int wCRCin = 0xFFFF;
// Integer.reverse(0x8005) >>> 16
int wCPoly = 0xA001;
for (int i = offset, cnt = offset + length; i < cnt; i++) {
wCRCin ^= ((int) source[i] & 0x00FF);
for (int j = 0; j < 8; j++) {
if ((wCRCin & 0x0001) != 0) {
wCRCin >>= 1;
wCRCin ^= wCPoly;
} else {
wCRCin >>= 1;
}
}
}
return wCRCin ^= 0xFFFF;
}
/**
* CRC-16/X25
*
* <table width="400px" border="1" cellpadding="0" cellspacing="0">
* <tr>
* <th>多项式</th>
* <th>初始值</th>
* <th>异或值</th>
* <th>Bit反转</th>
* </tr>
* <tr>
* <td align="center">0x1021</td>
* <td align="center">0xFFFF</td>
* <td align="center">0xFFFF</td>
* <td align="center">LSB First</td>
* </tr>
* </table>
*
* @param source
* @param offset
* @param length
* @return
*/
public static int CRC16_X25(byte[] source, int offset, int length) {
int wCRCin = 0xFFFF;
// Integer.reverse(0x1021) >>> 16
int wCPoly = 0x8408;
for (int i = offset, cnt = offset + length; i < cnt; i++) {
wCRCin ^= ((int) source[i] & 0x00FF);
for (int j = 0; j < 8; j++) {
if ((wCRCin & 0x0001) != 0) {
wCRCin >>= 1;
wCRCin ^= wCPoly;
} else {
wCRCin >>= 1;
}
}
}
return wCRCin ^= 0xFFFF;
}
/**
* CRC-16/XMODEM
*
* <table width="400px" border="1" cellpadding="0" cellspacing="0">
* <tr>
* <th>多项式</th>
* <th>初始值</th>
* <th>异或值</th>
* <th>Bit反转</th>
* </tr>
* <tr>
* <td align="center">0x1021</td>
* <td align="center">0x0000</td>
* <td align="center">0x0000</td>
* <td align="center">MSB First</td>
* </tr>
* </table>
*
* @param source
* @param offset
* @param length
* @return
*/
public static int CRC16_XMODEM(byte[] source, int offset, int length) {
int wCRCin = 0x0000;
int wCPoly = 0x1021;
for (int i = offset, cnt = offset + length; i < cnt; i++) {
for (int j = 0; j < 8; j++) {
boolean bit = ((source[i] >> (7 - j) & 1) == 1);
boolean c15 = ((wCRCin >> 15 & 1) == 1);
wCRCin <<= 1;
if (c15 ^ bit)
wCRCin ^= wCPoly;
}
}
wCRCin &= 0xFFFF;
return wCRCin ^= 0x0000;
}
}
