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public class CRC16 {
public static int CRC16_CCITT(byte[] buffer) { int wCRCin = 0x0000; int wCPoly = 0x8408; for (byte b : buffer) { wCRCin ^= ((int) b & 0x00ff); for (int j = 0; j < 8; j++) { if ((wCRCin & 0x0001) != 0) { wCRCin >>= 1; wCRCin ^= wCPoly; } else { wCRCin >>= 1; } } } return wCRCin ^= 0x0000; }
public static int CRC16_CCITT_FALSE(byte[] buffer) { int wCRCin = 0xffff; int wCPoly = 0x1021; for (byte b : buffer) { for (int i = 0; i < 8; i++) { boolean bit = ((b >> (7 - i) & 1) == 1); boolean c15 = ((wCRCin >> 15 & 1) == 1); wCRCin <<= 1; if (c15 ^ bit) wCRCin ^= wCPoly; } } wCRCin &= 0xffff; return wCRCin ^= 0x0000; }
public static int CRC16_XMODEM(byte[] buffer) { int wCRCin = 0x0000; int wCPoly = 0x1021; for (byte b : buffer) { for (int i = 0; i < 8; i++) { boolean bit = ((b >> (7 - i) & 1) == 1); boolean c15 = ((wCRCin >> 15 & 1) == 1); wCRCin <<= 1; if (c15 ^ bit) wCRCin ^= wCPoly; } } wCRCin &= 0xffff; return wCRCin ^= 0x0000; }
public static int CRC16_X25(byte[] buffer) { int wCRCin = 0xffff; int wCPoly = 0x8408; for (byte b : buffer) { wCRCin ^= ((int) b & 0x00ff); for (int j = 0; j < 8; j++) { if ((wCRCin & 0x0001) != 0) { wCRCin >>= 1; wCRCin ^= wCPoly; } else { wCRCin >>= 1; } } } return wCRCin ^= 0xffff; }
public static int CRC16_MODBUS(byte[] buffer) { int wCRCin = 0xffff; int POLYNOMIAL = 0xa001; for (byte b : buffer) { wCRCin ^= ((int) b & 0x00ff); for (int j = 0; j < 8; j++) { if ((wCRCin & 0x0001) != 0) { wCRCin >>= 1; wCRCin ^= POLYNOMIAL; } else { wCRCin >>= 1; } } } return wCRCin ^= 0x0000; }
public static int CRC16_IBM(byte[] buffer) { int wCRCin = 0x0000; int wCPoly = 0xa001; for (byte b : buffer) { wCRCin ^= ((int) b & 0x00ff); for (int j = 0; j < 8; j++) { if ((wCRCin & 0x0001) != 0) { wCRCin >>= 1; wCRCin ^= wCPoly; } else { wCRCin >>= 1; } } } return wCRCin ^= 0x0000; }
public static int CRC16_MAXIM(byte[] buffer) { int wCRCin = 0x0000; int wCPoly = 0xa001; for (byte b : buffer) { wCRCin ^= ((int) b & 0x00ff); for (int j = 0; j < 8; j++) { if ((wCRCin & 0x0001) != 0) { wCRCin >>= 1; wCRCin ^= wCPoly; } else { wCRCin >>= 1; } } } return wCRCin ^= 0xffff; }
public static int CRC16_USB(byte[] buffer) { int wCRCin = 0xFFFF; int wCPoly = 0xa001; for (byte b : buffer) { wCRCin ^= ((int) b & 0x00ff); for (int j = 0; j < 8; j++) { if ((wCRCin & 0x0001) != 0) { wCRCin >>= 1; wCRCin ^= wCPoly; } else { wCRCin >>= 1; } } } return wCRCin ^= 0xffff; }
public static int CRC16_DNP(byte[] buffer) { int wCRCin = 0x0000; int wCPoly = 0xA6BC; for (byte b : buffer) { wCRCin ^= ((int) b & 0x00ff); for (int j = 0; j < 8; j++) { if ((wCRCin & 0x0001) != 0) { wCRCin >>= 1; wCRCin ^= wCPoly; } else { wCRCin >>= 1; } } } return wCRCin ^= 0xffff; } }
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